Design of hybrid forward boost converter for renewable energy powered electric vehicle charging applications
Abstract : 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 charging stations. The main challenge in this concept is the unstable nature of renewable energy. As the energy storage system of charging station is directly connected to the renewable energy source like a solar panel, according to the variable and deficient input power condition, the converter should supply a regulated output at the required magnitude. If a conventional converter is used for this purpose, the charging efficiency will be poor for higher gain conditions. This article presents a hybrid forward-boost converter to overcome this challenge. By maintaining the power transfer efficiency higher, the gain can be varied to supply a regulated voltage, even for very low input conditions in this proposed topology. The maximum overall efficiency of 95% is achieved for a variable input condition of 30–50 V to provide an output voltage of 170 V. The concept is validated by implementing a 150 W hybrid converter.
? The E-Vehicles are mainly used the DC-DC converter. The existing system, Evehicles are charging by using the renewable energy and 12V input to give the electric vehicles.
? Solar energy obtained from the sunlight and wind energy is generating from the speed of wind. DC-DC converter (Boost converter) is mainly uses in the electric vehicles which is used to improve the voltage level.
? Battery is used to store the energy from the converter. Li-ion battery is used these vehicles which is one of the rechargeable battery and efficiently.
? This paper overcome these problems and improved the efficiency of the E-vehicles.
? A disadvantage of the boost converter is the possibility of a short circuit at a higher duty cycle.
? Both of the mentioned converter techniques having the desired advantages and considerable disadvantages as per their operating mode, a combination of both may result in an optimised topology.
? Using the forward converter principle in low input values and boost converter principle in higher input values, the input variation range problem is tackled.
? Few disadvantages are also associated with the proposed converter.
? To get the required output voltage, conventional converters are having limitation due to voltage stress over switches for a higher duty. The issue is solved up to an extent in this topology.
• The proposed system is to design a portable device based on the Buck- Boost converter are used. As a main source is received from the renewable energy.
• This system is especially for free from pollution and over comes the disadvantages of existing system.
• The renewable energy supply is always flexible due to its weather dependency. For solar-based energy generation, according to the solar irradiation, the output voltage varies.
• As the converter is taking input from the renewable energy source directly, the voltage level are improved converter by itself.
• For medium power EV charging applications, the DC–DC converter circuit should amplify the input voltage to a higher value.
? The advantages of the boost converter are the simplicity of the circuit, high efficiency with low or medium duty cycle etc.
? The main advantage of the forward converter is that the gains above and below unity can be achieved by just varying duty and turns ratio.
? The advantages of both converters brought together to obtain a precise and accurate output.
? After the testing of the proposed converter, various advantages can be formulated over conventional converters.
? While integrating one converter with another, there should not be a performance conflict between the converters.
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