Design of Electric Vehicle Based on Three-Phase PWM Rectifier

GW MB10F 0.8A 1000V rectifier bridge

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Summary:

The electric vehicle (ev) is driven by the motor, and the power of the motor comes from the rechargeable battery, and the electric vehicle has far more requirements for the operating characteristics of the battery than the conventional battery system. With the improvement of battery technology, due to the high voltage and high current in the electric vehicle battery system and the complicated charging algorithm, the charging of the battery becomes more and more complicated, which will cause great interference to the existing power grid. . Therefore, a charger that is efficient and has low distortion is required.

Traditionally, chargers can be divided into two broad categories: linear power supplies and switching power supplies. Linear power supplies have three main advantages: simple design, no electrical noise at the output and low cost. However, the low efficiency of the charging circuit of the linear power supply is a serious disadvantage for the charger. These problems can be solved by using a switching power supply, which is high in efficiency, small in size, and low in cost. Conventional switching power supply chargers use uncontrolled or semi-controlled devices such as thyristors for rectification. Although they can obtain a relatively smooth DC voltage, they also inject a large amount of reactive power and harmonic current into the grid, causing a large impact on the grid. Pollution. With the development of power electronics technology, the three-phase voltage type pwm rectifier (vsr) can solve the power because it has the advantages of controllable power factor, grid-side current approaching sinusoidal, DC-side voltage stability, etc. Low factor, large harmonic current and other issues.

However, the switching elements of the pwm rectifier consume energy when the voltage and current are not zero, and as the switching frequency increases, the losses on the switching device become larger. The use of resonant zero-voltage soft switching can solve these problems, and has many advantages: the soft switching of the power switch, the loss during the switching process will be small, which in turn will increase the efficiency of charging and increase the frequency of operation. Thus the size and weight of the charger will also be reduced. Another benefit is that the harmonic content of the voltage and current in the rectifier is reduced after using a resonant soft switch. Therefore, when the resonant type rectifier and the conventional rectifier operate at the same power level and switching frequency, the EMI problem caused by the resonant type rectifier is much smaller. A resonant rectifier is used to increase the power level, charging efficiency, reliability, and other operating characteristics of the charger.

The three-phase resonant inverter is widely used in the field of motor speed control. In this paper, a three-phase inverter is designed and a three-phase pwm rectifier is designed. And according to the characteristics of the resonant rectifier, the control method is improved to achieve the lowest distortion (df) and the smallest total harmonic distortion (thd). Applying it to the electric vehicle charger can reduce the pressure of the power factor correction section of the charging station, and because of the soft switching technology, the charging efficiency is not reduced due to the addition of the controllable switching tube, which is the charging machine. Large-scale integration into the grid provides the necessary conditions.

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