Implementation of Enhanced Power Quality Electric Vehicle Charging System with Zeta Topology

Because of the non-linear nature of diode-bridge rectifier, Electric Vehicle battery chargers prevalent now are facing issues due to Power Quality (PQ) deterioration at AC mains. They suffer from disadvantages like high Total Harmonic Distortion(THD), highly distorted input current and low power factor. The proposed zeta converter methodology rectifies all these disadvantages. Here the output is made to follow the input as a result of which high power factor is obtained. Control scheme used is simple since it is needed only for controlling one switch. Hence the size and cost become low. Converter used provides regulated dc output which is fed to Electric vehicle battery. The voltage and current is sensed and controlled by the controller which employs dual PI control. These control signals help in generating the firing pulses for the converter. This paper proposes a possibility to develop a battery charger for electric vehicle such as E-Rickshaws and Electric scooter having improved PQ indices according to IEC 61000-3-2 standard, enhanced battery life with uniform charging current waveform, Total Harmonic Distortion (THD) below 5%, input current drawn remaining sinusoidal irrespective of voltage variations also helps in maintaining the input power factor at unity.