POWER QUALITY IMPROVEMENT IN PFC BRIDGELESS-LUO CONVERTER FED BLDC MOTOR DRIVE

 This paper presents a PFC (Power Factor Correction) based BL-Luo (Bridgeless-Luo) converter fed BLDC (Brush less DC) motor drive. A single voltage sensor is used for the speed control of BLDC motor and PFC at AC mains. The voltage follower control is used for a BL-Luo converter operating in DICM (Discontinuous Inductor Current Mode). The speed of t...

OVER VOLTAGE AND UNDER VOLTAGE LOAD PROTECTION WITH ALERT SYSTEM

  In the paper, GSM Modem SMS Alert aims to build a system that monitors voltage and provides a breakpoint based low and high voltage tripping mechanism that avoids any damage to the load and sends a text message (SMS) to alert the user whenever the condition of under-voltage or overvoltage occurs. There is a chance of damaging electro...

FUZZY LOGIC CONTROL FOR SOLAR PV FED MODULAR MULTILEVEL INVERTER TOWARDS MARINE WATER PUMPING APPLICATION

 This paper presents the design and implementation of Modular Multilevel Inverter (MMI) to control the Induction Motor (IM) drive using intelligent techniques towards marine water pumping applications. The proposed inverter is of eleven levels and has the ability to control the speed of an IM drive which is fed from solar photovoltaics. It is estima...

Design and application of a self-powered dual-stage circuit for piezoelectric energy harvesting system

 This paper describes the design and practical application of a dual-stage H-Bridge (DSHBR) circuit to reduce the rectification losses and mitigate ripples in piezoelectric energy harvesting. The proposed DSHBR circuit integrates both AC-DC and DC-DC conversion processes using bidirectional switches and a step-up DC-DC converter, which applies to bo...

CMOS TRANS-CONDUCTANCE LNA INTEGRATION OF VITAL SIGN PROCESSING RECIEVER WITH CLUTTER ELIMINATION USING SC CHEBYSHEV LPF

 This brief describes a critical signal processing circuit without any automatic signal processing or ultra-wideband (UWB) pulse-based radar algorithm for simultaneous dc/near-dc exclusion and out-of-band interference removal. As a secure and balanced pseudo resistor applied under a servo feedback mechanism in a critical signal receiver of the sensi...

BATTERY CHARGING AND DISCHARGE CONTROL OF A HYBRID ENERGY SYSTEM USING MICROCONTROLLER

 This study aims to control charging and discharging the battery for hybrid energy systems. The control system works by selecting the right energy source to supply voltage to the load. And also this control system can regulate charging and discharging the battery automatically. The voltage source consists of two energy, namely from the battery and D...

AN IMPROVED THREE STAGES CASCADING PASSIVITY-BASED CONTROL OF GRID-CONNECTED LCL CONVERTER IN UNBALANCED WEAK GRID CONDITION

 This paper proposes an improved three-stages cascading passivity-based control (PBC) for a grid -connected LCL converter in unbalanced weak grid condition. In general, the traditional double-loop control based on positive and negative sequence transformations is used in grid-connected converter control in unbalanced weak grid condition. However, it...

A HIGH-EFFICIENCY SEPIC BASED DC-DC CONVERTER DESIGN BY ROBUST PID CONTROLLER

 This work addresses the problem of instability occurring in the voltage control mode of a non-minimum phase Quasi Resonant High Gain, High-Efficiency Single Ended Primary Inductor Converter -based DC-DC converter with continuous input current. To solve this instability issue in the presence of uncertainties and the external disturbances, quantitati...

Solar H8 inverter to reduce leakage currents in grid connected applications

 Solar energy is a promising alternative energy source for a sustainable pollution-free future. But certain factors such as solar irradiation, lack of sunlight during night hours etc. degrade or diminish the scope of solar power. To address with this problem MPPT technique is used here. Due to the requirements of high efficiency, reliability, power ...

Low MOSFET Count Isolated DC-AC Converter

 This letter proposes a novel soft-switched single-stage-isolated dc-ac converter topology from the industry point of view. The proposed converter requires a lesser number of MOSFETs compared to a widely studied cycloconverter-type (CCT)-isolated dc-ac converter topology. This converter provides lower duty cycle loss, better efficiency, and electrom...

DIODE CLAMPLED MULTIPLE LEVEL INVERTER WITH 3 LEVEL OUTPUT

  The elementary concept of a multilevel converter is to achieve high power by using a series of a power semiconductor switches with lower voltage D.C source. The output voltage waveform of a multi-level inverter is composed of the number of levels of voltages, typically obtained from capacitor voltage sources. In this paper, single phase diode cl...

Design of hybrid forward boost converter for renewable energy powered electric vehicle charging applications

 The grid-connected electric vehicle charging stations are being integrated into renewable energy for preserving the conventional energy resources as well as to ensure sustainable development of the society. In addition to the effortless charging, the sudden demand variations in the grid can be met by the renewable energy storage system in the charg...

DC MOTOR SPEED CONTROL USING CHOPPER

 The Objective of the paper is to control the separately excited dc motor by using the IGBT based chopper. The speed of separately excited dc motor can be control by varying the armature voltage and varying field flux. Thus the speed can be controlled for under rated speed and speed beyond the rated speed, respectively. In this paper, the motor spee...

Control of power electronics-based synchronous generator for the integration of renewable energies into the power grid

 This paper addresses a single synchronous controller (SSC) for interfaced converters with high penetration of renewable energy resources (RERs) into a low inertia power grid. The SSC is modelled based on a comprehensive dependence between each operative feature of a synchronous generator (SG) and a power electronics converter. This can properly imp...

DIODE CLAMPLED MULTIPLE LEVEL INVERTER WITH 3 LEVEL OUTPUT

  The elementary concept of a multilevel converter is to achieve high power by using a series of a power semiconductor switches with lower voltage D.C source. The output voltage waveform of a multi-level inverter is composed of the number of levels of voltages, typically obtained from capacitor voltage sources. In this paper, single phase diode cl...

ADVANCED WIRELESS POWER TRANSFER SYSTEM FOR E VEHICLE

 A detailed accumulation of the methods of wireless power transfer (WPT) including short range as well as mid range transmission . The technology and the science behind WPT and the future scope is discussed in detail. While a lot of research has been done on this topic in the previous decade, a large part of it is yet to be explored. The topics furt...

Supplementary Power Control of an HVDC System and its Impact on Electromechanical Dynamics

 This paper presents a comprehensive analysis of the impact that supplementary power control of an HVDC link has on the electromechanical dynamics of power systems. The presented work addresses an interesting phenomenon that may occur when an HVDC power controller is installed to support frequency stability. In specific cases, a high gain HVDC frequ...

Software and Hardware Decision Support System for Operators of Electrical Power Systems

 The unpredictability of processes in electric power systems (EPS) determine complexity of its control. This problem is especially relevant for EPS with renewable energy sources, FACTS and HVDC systems. Despite automatic control development, many issues related to EPS regimes control are solved by power system operators. Decision support systems (DS...

Sliding Mode Control of Two-Parameter Fourth-Order Chaos Model of Power System

  As a complex nonlinear system, the power system in operation may experience chaotic oscillation which can threaten the stability of the system for unexpected events and uncertain factors. Initially, through considering factors such as the generators, the power system node voltage amplitude and phase angle, this article establishes a fourth-orde...

Reactive Power Control of Hybrid Multi-terminal HVDC Systems Considering the Interaction Between the AC Network and Multiple LCCs

 A strategy was developed for reactive power control of the line-commutated converters (LCCs) of hybrid multi-terminal high-voltage direct current (MT-HVDC) systems. In the conventional method, the reactive power outputs of hybrid MT-HVDC systems are regulated discontinuously by only using switched shunt devices (SSDs). If continuous reactive power ...

PMU Based Frequency Regulation Paradigm for Multi-Area Power Systems Reliability Improvement

 This work proposes a novel frequency regulation paradigm for multi-area interconnected power systems. The developed approach capitalizes on phasor measurement units (PMUs) advanced monitoring to overcome design limitations imposed by legacy supervisory control and data acquisition (SCADA) systems. For this, a novel measurement-based controller inte...

The Use of the Hybrid Active Power Filter in LCC-HVDC Considering the Delay-Dependent Stability

 The line commutated converter (LCC) based HVDC projects generally use passive AC filters for harmonic cancellation, which has disadvantages of large footprint, poor filtering effect due to the offset of the resonance point, etc. This paper introduces a high-power LC hybrid active power filter (HAPF), which can meet the requirements of filtering and...

Partitioning-Based Unified Power Flow Algorithm for Mixed MTDCAC Power Systems

 This paper presents a unified power flow algorithm for large and complex mixed AC/DC power systems based on the partitioning of power grids, a version of the two-level Newton method, and the modified nodal analysis formulation. Partitioning significantly increases numerical efficiency without altering the accuracy of the power flow solution. This a...

Optimal Design Method of Flexible Excitation System for Improving Power System Stability

 Providing sufficient damping over the full frequency range of low-frequency oscillation (LFO) is a challenge in modern power systems. The flexible excitation system with two damping channels, controlled by the power system stabilizer (PSS) and the reactive power damping controller (RPDC), respectively, provides a new way to solve this problem. The ...

Modeling of Time-Delayed Distributed Cyber-Physical Power Systems for Small-Signal Stability Analysis

 Compared with a power system under centralized control, a power system under fully distributed control has stronger interdependence between its physical side and cyber side. Such a system is a typical cyber-physical system (CPS). The time delay problem is one of the most critical issues in the application of distributed control for power systems. F...

Examination of Semi-Analytical Solution Methods in the Coarse Operator of Parareal Algorithm for Power System Simulation

 With continuing advances in high-performance parallel computing platforms, parallel algorithms have become powerful tools for development of faster than real-time power system dynamic simulations. In particular, it has been demonstrated in recent years that parallel-in-time (Parareal) algorithms have the potential to achieve such an ambitious goal....

Adaptive State Estimation for Power Systems Measured by PMUs with Unknown and Time-Varying Error Statistics

 Measurement error is a crucial factor that determines the accuracy of state estimation (SE). Conventional estimators have fixed models, and can yield optimal performance only when the measurement error statistics exactly meet the assumptions. In reality, however, the error distribution is usually unknown and time-varying, resulting in suboptimal st...

On the Impact of Auto-Correlation of Stochastic Processes on the Transient Behavior of Power Systems

 This letter studies the impact of auto-correlation of stochastic processes on the dynamic response of power systems. The frequency spectrum of the trajectories of the state variables of the system is utilized as a metric to evaluate this impact. The case study considers the well- known two-area system as well as with a 1479-bus dynamic model of the...

Gas Network's Impact on Power System Voltage Security

 Due to the energy linkage between electricity and gas networks, assessing the voltage security of the electricity system without considering the practical constraints of both systems, may lead to unrealistic values of loading margins (LM). This work proposes a model for investigating the impact of gas networks on the voltage security of electric tr...

Extended-Distance Wireless Power Transfer System with Constant Output Power and Transfer Efficiency based on Parity-Time-Symmetric Principle

 Maintaining constant power transfer while keeping near-unity transfer efficiency at varying transfer distances is a major challenge for existing wireless power transfer (WPT) system with multiple repeaters. In order to overcome the problem, this article proposes a novel WPT mechanism with multiple repeaters based on the concept of parity-time symme...

Decentralized Data-Driven Load Restoration in Cou-pled Transmission and Distribution System with Wind Power

 This paper proposes a new decentralized data-driven load res-toration (DDLR) scheme for transmission and distribution (TD) systems with high penetration of wind power. Robust DDLR models are constructed in order to handle uncertainties and ensure the feasibility of decentralized schemes. The Wasserstein metric is used to describe the ambiguity sets...

Current-Bunch Concept for Parasitic-Oriented Extraction and Optimization of Multi-Chip SiC Power Module

 Parasitic inductance reduction is increasingly vital for the SiC power module in high-frequency and high-capacity applications. To address the parasitic issue, the automatic layout design offers the potential to pursue the optimal configuration of the power packaging. However, the efficient and accurate parasitic extraction of the packaging is the ...

Control Performance Standards-Oriented Event-Triggered Load Frequency Control for Power Systems Under Limited Communication Bandwidth

 Load frequency control (LFC) of modern power systems tends to employ open communication networks to transmit measurement/control signals. Under a limited network bandwidth, the continuous and high-sampling-rate signal transmission will be prone to degradation of the LFC performance through network congestion. This brief proposes a decentralized con...

State Observation of Power Systems Equipped with Phasor Measurement Units The Case of Fourth Order Flux-Decay Model

  The problem of effective use of Phasor Measurement Units (PMUs) to enhance power systems awareness and security is a topic of key interest. The central question to solve is how to use this new measurements to reconstruct the state of the system. In this paper we provide the first solution to the problem of (globally convergent) state estimation...

Negative Results on Deploying Distributed Series Reactance Devices to Improve Power System Robustness Against Cascading Failures

 Distributed Series Reactances are devices that dynamically increase the impedance of a line to reduce the power ow it carries. This work explores whether widely deploying these devices enhances a power system's robustness against line overload cascading failures. The presence of Distributed Series Reactances may make it less likely that equipped li...

Improvement and Dynamic Simulation Test of a Power Electronic Device Applied to Phase Sequence Exchange Technology

 Phase sequence exchange (PSE) is a recently developed emergency control technology. PSE uses power electronic devices to switch the three-phase sequence, which reduces the power angle of the generator by 120 and prevents the system from losing stability. In this work, the structure of the PSE device is improved. Based on the original nine solid-sta...

Hierarchical Modeling Scheme for High-Speed Electromagnetic Transient (EMT) Simulations of Power Electronic Transformers

 The extensive application of the power electronic transformers (PET) in power systems poses a challenge as the accurate and high-speed electromagnetic transient (EMT) simulation of PET has been a critical issue. The computational time of the detailed EMT simulation of PET on EMT programs is unacceptable, due to the large electrical node count, micr...

A Theorem on Power Superposition in Resistive Networks

  The superposition theorem, a particular case of the superposition principle, states that in a linear circuit with several voltage and current sources, the current and voltage for any element of the circuit is the algebraic sum of the currents and voltages produced by each source acting independently. The superposition theorem is not applicable ...

VSC-HVDC Interties for Urban Power Grid Enhancement

  Urban power grids are facing many operational and expansion challenges to meet further demand growth and increased reliability requirements. Advanced transmission technologies have been considered by the electric utilities to effectively increase the utilization of existing infrastructure and operational flexibility. The focus of this paper is ...

Modelling on Novel Cable Traction Power Supply System and Power Distribution Analysis

 Novel cable traction power supply system (NCTPSS) is a kind of long distance co-phase traction power supply system (TPSS), it can effectively solve problems caused by train's passing through electrical phase separation and improve utilization rate of regenerative energy in system, which is an ideal traction power supply mode. However, its structure...

Improving the Energy-Conversion Efficiency of a PV-TE System with an Intelligent Power-Track Switching Technique and Efficient Thermal-Management Scheme

 A photovoltaic-thermoelectric (PV-TE) hybrid system can be used for efficient thermal energy utilization from the generated waste heat in PV device. In this paper, an efficient PV-TE hybrid System with intelligent power-track switching technique and thermal management based on energy conversion is proposed. To make the output power of PV-TE system ...

General Steady-State Modeling and Linearization of Power Electronic Devices in AC-DC hybrid Grid

 Power electronic devices are important in the modern power system. Control functions and operational characteristics of power electronic devices bring higher nonlinearity and heavier calculation burden for power system analysis, especially in optimization problems. In this paper, a general steady-state model of power electronic devices in the AC-DC...

Cascading Failure A nalysis of Cyber Physical Power Systems Considering Routing Strategy

 In this brief, we develop a novel model to study the cascading failure in cyber-physical power systems. We use a discrete packet traffic model that follows a specific routing strategy to describe the dynamic data transmission in the information network. Moreover, the dynamic load flow model that takes into account the power-frequency characteristic...

A Framework for Power System Operational Planning under Uncertainty Using Coherent Risk Measures

 With the increasing integration of renewable energy sources (RESs) and the implementation of dynamic line rating (DLR), the accompanying uncertainties in power systems require intensive management to ensure reliable and secure operational planning. However, while numerous approaches and methods in the literature deal with uncertainties, they have n...

Resilient Reliable H8 Load Frequency Control of Power System With Random Gain Fluctuations

 This article proposes a resilient reliable H8 load frequency control (LFC) design for power system involving the external load disturbances, stochastic actuator failures, and randomly occurring gain fluctuations. In this regard, the separate random variables are introduced which characterize the actuator failures and gain fluctuations in an individ...

Resilient Distributed Coordination Control of Multiarea Power Systems Under Hybrid Attacks

 Resilient distributed coordination control is studied on multiarea power systems with low inertia under hybrid attacks, including denial-of-service (DoS) attack and deception attack. The communication among various areas under the DoS attack is deteriorated to switching residual topologies whose time characteristic is modeled by model-dependent ave...

Optimal Defense Resources Allocation for Power System Based on Bounded Rationality Game Theory Analysis

 Power utility allocates defense resources to prevent unscheduled load shedding due to transmission line failure caused by the malicious physical attacks. Game theory explains the interaction between the defender and the attacker, overcoming the shortage of unilateral vulnerability analysis. Different from previous researches typically assuming the ...

Fifth Harmonic Spectral Voltage Components in EHV Power Transmission Systems

  Fifth harmonic voltages and currents have been measured in some extra high voltage (EHV) power transmission systems. This paper contains a discussion and explanation of this phenomenon. The emphasis is on the impact of overexcitation of power transformers in EHV systems. Examples of measurements taken in 500 kV substations are illustrated and r...

Data Based Linear Power Flow Model Investigation of a Least-Squares Based Approximation

  Linearization of power flow is an important topic in power system analysis. The computational burden can be greatly reduced under the linear power flow (LPF) model while the model error is the main concern. Therefore, various linear power flow models have been proposed in literature and dedicated to seek better linear models. Many linear power ...

Coordinated Optimal Power Flow for Integrated Active Distribution Network and Virtual Power Plants Using Decentralized Algorithm

 With the wide application of distributed energy technology in active distribution networks (ADNs), virtual power plants (VPPs) are introduced as a promising integration and management technology. To coordinate their operation schedule and ensure confidentiality, we establish a coordinated optimal power flow (OPF) model and propose an efficient dece...

Transmission Range Extension of PT-symmetry-based Wireless Power Transfer System

 The wireless power transfer (WPT) system based on parity-time (PT) symmetry has been proved to be a promising WPT system due to its characteristics of constant efficiency and output power. However, the PT-symmetric range is limited, and it is necessary to widen the PT-symmetric region to extend the distance of constant and efficient transmission. T...

Stability and Stabilization of the Fractional-order Power System with Time Delay

 This brief investigates the problems of stability and stabilization of the fractional-order power system with time delay. The models of the fractional-order nonlinear and linearized delayed power system are established, respectively. Based on the theory of the fractional calculus and the Lyapunov functional technique, the relevant stability criteri...

Power Dense HTS Networks Designs for Contingencies and Resiliency of Electric Transport Systems

 The ability of HTS cable networks to provide a solution for the high power density requirements of electric transportation applications was explored. The high current density and the temperature-dependent critical current features of HTS cables were shown to allow resilient designs for power distribution in electric transportation applications. Hea...

Analysis of Power Grid Voltage Stability with High Penetration of Solar PV Systems

 Grid integration of solar photovoltaic (PV) systems has been escalating in recent years, with two main motivations: reducing greenhouse gas emission and minimizing energy cost. However, the intermittent nature of solar PV generated power can significantly affect the grid voltage stability. Therefore, intermittent solar PV power generation and uncer...

Adaptive Power Point Tracking Control of PV System for Primary Frequency Regulation of AC Microgrid with High PV Integration

 With the increasing integration of PV generation in AC microgrids, it is challenging to keep the stability of system frequency due to the intermittent and stochastic nature of PVs. Thus, in order to reduce the investment and maintenance costs of storage systems, the electric utility has shown increasing interest in calling on PVs to provide frequen...

A Multiplexing Optical Partial Discharge Sensing System for Power Transformer using a Single Photodetector

 Optical ultrasonic sensor multiplexing for partial discharge (PD) detection based on a single photodetector is a challenging task. In this paper, we propose a novel multiplexed optical ultrasonic sensing system based on swept frequency interferometry. Optical ultrasonic sensor multiplexing is achieved using different carrier frequencies that depend...

Optimized Reactive Power Capability of Wind Power Plants with Tap-Changing Transformers

 With the recent advancements in power electronics for wind turbines (WTs) and increasing penetration of wind energy, wind power plants (WPP) have become necessary contributors of reactive power support for the bulk power system. Balancing reactive power support with individual WT operating requirements in a cost-effective manner is a challenge for ...

Online Noninvasive Technique for Condition Monitoring of Capacitor in Linear Power Supplies

 Linear power supplies (LPSs) are widely used in fields including measurement systems, radiofrequency systems, medical applications, nuclear power plants, and spacecraft electronics. Electrolytic capacitors are used in a variety of devices because of their small size, low cost, and large capacity. During the use of electrolytic capacitor, it is very...

Highly-Efficient Fully-integrated Multi-Voltage-Domain Power Management with Enhanced PSR and Low Cross Regulation

  Multi-voltage domains are urgently needed in modern SoCs, while existing solutions such as switched DC-DC converter, switched capacitor converter and low-dropout regulator (LDO) do not generate multi-voltage domains conveniently and inexpensively. This paper presents a highly-efficient fully-integrated power management strategy to provide the ...

Harmonic Virtual Impedance Design for Optimal Management of Power Quality in Microgrids

  Power quality is an important concern for practical microgrid (MG) applications due to the widespread use of non-linear loads, and it is characterised by the implicit trade-off between voltage quality in the MG nodes and harmonic current sharing between distributed generators (DGs). Active and passive filters can be used to address this problem...

A Double-side Cooled SiC MOSFET Power Module with Sintered-silver Interposers I. Design, Simulation, Fabrication, and Performance Characterization

 Planar, double-side cooled power modules are emerging in electric-drive inverters because of their low profile, better heat extraction, and lower package parasitic inductances. However, there is still concern about their reliability due to the rigid interconnection between the device chips and two substrates of the power module. In this paper, a po...

Quantifying the Contribution of Dynamic Reactive Power Compensators on System Strength at LCC-HVdc Converter Terminals

 This paper presents improved indices to evaluate the contribution of reactive power compensators at HVdc converter terminals. The presence of such compensators impacts converter performance, such as the maximum available power (MAP) limit, susceptance to commutation failure, fault recovery time and temporary over voltage. Traditionally, the Effecti...

Optimal Stochastic Operation of Integrated Electric Power and Renewable Energy with Vehicle-Based Hydrogen Energy System

 The renewable power-based hydrogen production can lead to the integrated electric power and hydrogen system (IPHS) and a pathway to a sustainable energy utilization. Hydrogen is mainly transported via hydrogen tube trailers (HTs), making the hydrogen energy system (HES) operation quite different from those of others energy technologies. This paper ...

Efficiency Optimization Based Parameter Design Method for the Capacitive Power Transfer System

  In this article, a parameter design method is proposed to improve the dc–dc efficiency of the capacitive power transfer (CPT) system. Similar to the inductive power transfer (IPT) system, the capacitive coupler is analyzed by using a T-type model, giving direct insight into the impedance refracted from the secondary side. Compared to the IPT sy...

Effective Parallelism for Equation and Jacobian Evaluation in Power Flow Calculation

 This letter investigates parallelism approaches for equation and Jacobian evaluations in power flow calculation. Two levels of parallelism are proposed and analyzed: inter-model parallelism, which evaluates models in parallel, and intra-model parallelism, which evaluates calculations within each model in parallel. Parallelism techniques such as mul...

Coupling Characteristics of Electromagnetic Disturbance of On-Site Electronic Device Power Port in Substations and Its Suppression

 The switching operations of circuit breakers and disconnectors in substations can generate very fast transients, including transient earth voltage rise and intense electromagnetic radiation, causing severe disturbance of on-site electronic devices in substations and seriously affecting the development of smart power equipment. The power supply of a...

Adaptive Decoupling Between Receivers of Multi-Receiver Wireless Power Transfer System Using Variable Switched Capacitor

 With a fixed driving frequency, the number of Rx is not limited. It is analyzed that the quadrature phenomenon of the Tx and Rx currents can be used as a sign that the cross-coupling is fully compensated. A phase synchronization channel is established that shares power transfer coils. An MCU-free feedback loop is constructed in Rx to control the va...

Short Circuit Current Constrained UC in the High IBG-Penetrated Power Systems

  Inverter Based Generators (IBGs) have been increasing significantly in power systems. Due to the demanding thermal rating of Power Electronics (PE), their contribution to the system Short Circuit Current (SCC) is much less than that from the conventional Synchronous Generators (SGs) thus reducing the system strength and posing challenges to sys...

Observability Analysis for Large-Scale Power Systems Using Factor Graphs

  The state estimation algorithm estimates the values of the state variables based on the measurement model described as the system of equations. Prior to applying the state estimation algorithm, the existence and uniqueness of the solution of the underlying system of equations is determined through the observability analysis. If a unique solutio...

Design and Comparison of Auxiliary Resonance controllers for Mitigating Modal Resonance of Power Systems Integrated with Wind Generation

 Full converter-based wind power generation (FCWG, e.g., a permanent magnet synchronous generator (PMSG)), though normally considered to be decoupled from the external power grid can be actuated as an inertia source to suppress modal resonance in wind generation penetrated power systems by installing auxiliary resonance controllers (ARCs). In this p...

BATTPOWER Toolbox Memory-Efficient and High-Performance MultiPeriod AC Optimal Power Flow Solver

  With the introduction of massive renewable energy sources and storage devices, the traditional process of grid operation must be improved in order to be safe, reliable, fast responsive and cost efficient, and in this regard power flow solvers are indispensable. In this paper, we introduce an Interior Point-based (IP) Multi-Period AC Optimal Pow...

Assessment of Conservation Voltage Reduction Capabilities Using Load Modelling in Renewable-Rich Power Systems

 The conservation voltage reduction (CVR) and load modelling have acquired a renewed interest in reassessing the CVR capabilities and load model parameters for renewablerich distribution networks. The underlying theoretical views behind the changes in load model parameters and subsequent CVR capabilities in the distribution networks caused by the hi...

Accuracy of Three Inter-Terminal Capacitance Models for SiC Power MOSFETs under Fast Switching

 This paper presents a comprehensive analysis of non-linear voltage-dependent capacitances of vertical SiC power MOSFETs with lateral channel, focusing specifically on fast switching transients. The capacitance-voltage (C-V) device characteristics, (Cgs, Cgd, Cds), being dependent on both Vgs and Vds, are extracted by means of two-dimensional Techno...

Voltage-sourced Converter fed High-speed SRM Drive System with Energy Feedback and Near-Unity Power Factor

 The diode bridge rectifier fed asymmetric halfbridge converter (AHBC) is conventionally employed to drive switched reluctance motors (SRMs), which leads to poor grid-side power quality. In the proposed system, a topology made up of a voltage-sourced converter (VSC) and an AHBC is employed to drive the high-speed SRM. Stable SRM operation can be obt...

Synchronized Waveforms a Frontier of Data-Based Power System and Apparatus Monitoring, Protection and Control

  Voltage and current waveforms contain the most authentic and granular information on the behaviors of power systems. In recent years, it has become possible to synchronize waveform data measured from different locations. Thus largescale coordinated analyses of multiple waveforms over a wide area are within our reach. This development could unle...

Predicting Failure Cascades in Large Scale Power Systems via the Influence Model Framework

  Large blackouts in power grids are often the consequence of uncontrolled failure cascades. The ability to predict the failure cascade process in an efficient and accurate manner is important for power system contingency analysis. In this paper, we propose to apply the influence model for the prediction and screening of failure cascades in large...

Predicting Failure Cascades in Large Scale Power Systems via the Influence Model Framework

  Large blackouts in power grids are often the consequence of uncontrolled failure cascades. The ability to predict the failure cascade process in an efficient and accurate manner is important for power system contingency analysis. In this paper, we propose to apply the influence model for the prediction and screening of failure cascades in large...

Optimal Reactive Power Dispatch with Discrete Controllers Using a Branch-and-Bound Algorithm A Semidefinite Relaxation Approach

 Recently, several convex relaxations have been successfully applied to solve the AC optimal power flow (OPF) problem, which has caught the attention of the research community. Among these relaxations, a relaxation based on semidefinite programming (SDP) stands out. Accordingly, in this work a methodology to solve the optimal reactive power dispatch...

Flexible Power Point Tracking for Solar Photovoltaic Systems using Secant Method

 Grid-connected photovoltaic (PV) systems impose challenges like voltage fluctuations, low system inertia and power quality issues. The need to tackle these challenges led to the introduction of flexible power point tracking (FPPT), where the PV power output is controlled by an energy management system (EMS), rather than solely operating the PV syst...

Data-Driven Chance-Constrained Optimal Gas-Power Flow Calculation A Bayesian Nonparametric Approach

 This paper proposes a data-driven chanceconstrained optimal gas-power flow (OGPF) calculation method without any prior assumption on the distribution of uncertainties of wind power generation. The Gaussian mixture model is employed to fit the uncertainty distribution, where the Bayesian nonparametric Dirichlet process is adopted to tune the compone...

A Multi-loop Transient Stability Control via Power Modulation from Energy Storage Device

  This paper presents an optimal transient-stability control strategy that modulates the real power injected and absorbed by distributed energy-storage devices. These devices are located at the high-voltage bus of several generators in a synchronous power system. The system is broken into areas based upon groupings of generators. The control stra...

Searching for Critical Power System Cascading Failures with Graph Convolutional Network

 Power system cascading failures become more time variant and complex because of the increasing network interconnection and higher renewable energy penetration. High computational cost is the main obstacle for a more frequent online cascading failure search, which is essential to improve system security. We propose a more efficient search framework ...

On the Impact of Discrete Secondary Controllers on Power System Dynamics

  This paper discusses the impact of discrete secondary controllers on the dynamic response of power systems. The idea of the paper originates from the observation that there is a range of values, from few tens of seconds to few minutes, of the execution cycles of conventional automatic generation control (AGC) that leads to a limit cycle. Below ...

Future of Electrical Aircraft Energy Power Systems An architecture review

 This paper presents and in-depth analysis of AllElectric-Aircraft (AEA) architectures. The aim of this work is to provide a global vision of the current AEA state of art, to estimate main technological gaps and drivers and to identify the most promising architecture configuration for future electrical aircraft in the context of a twin propeller 20 ...

Fast Power System Event Identification using Enhanced LSTM Network with Renewable Energy Integration

  Accurate and fast event identification in power systems is critical for taking timely controls to avoid instability. In this paper, a synchrophasor measurementbased fast and robust event identification method is proposed considering different penetration levels of renewable energy. A difference Teager-Kaiser energy operator (dTKEO)-based algori...

An Efficient Eigenvalue Tracking Method for Time-Delayed Power Systems based on Continuation of Invariant Subspaces

  Time delays are inevitable in the power systems with wide-area control signals, which may compromise the control performance and thus jeopardize the stability of the power systems. To analyze the impacts of system parameters on critical oscillation modes of a time-delayed power system (TDPS), a new method for eigenvalue trajectory tracking of TD...

A Centralized Control Strategy for Grid-connected High-speed Switched Reluctance Motor Drive System with Power Factor Correction

 Conventionally, the converter of switched reluctance motor (SRM) is fed by the uncontrollable diode bridge rectifier (DBR), which leads to a low grid-side power factor (PF) and high current total harmonic distortion (THD). In this paper, an alternative solution for the grid-connected high-speed SRM drive system with improved PF is proposed. In the ...

Modelling of Supercapacitor Banks for Power System Dynamics Studies

 The paper presents accurate and simple dynamic model of a supercapacitor bank system for power system dynamics studies. The proposed model is derived from a detailed RC circuit representation. Furthermore, a complete control system of the supercapacitor bank is also presented. The proposed model is easy to integrate in any power system simulation s...

Damping Power System Electromechanical Oscillations Using Time Delays

  This paper proposes to utilize intentional time delays as part of controllers to improve the damping of electromechanical oscillations of power systems. Through stability theory, the control parameter settings for which these delays in Power System Stabilizers (PSSs) improve the small signal stability of a power system are systematically identi...

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