Photovoltaic Based Three-Phase Three-Wire DSTATCOM to improve Power Quality

Three-phase three-wire Distribution Static Compensator (DSTATCOM) with Photovoltaic (PV) array or battery operated DC-DC boost converter is proposed in this paper. The proposed DSTATCOM consists of a three-leg Voltage Source Converter (VSC) with a DC bus capacitor and it provides continuous reactive power compensation, source harmonic reduction and load compensation throughout the day. With the help of PV array or battery, which is connected to the dc link of VSC via the DC-DC boost converter is used to maintain the desired voltage to the de bus capacitor for continuous compensation to the load. The Icos controlling algorithm is proposed for three-phase three-wire DSTATCOM. In this algorithm, the fuzzy logic controller is compared with the conventional PI (Proportional Integral) controller at DC bus to regulate the DC link capacitor voltage. The fuzzy controller is used to maintain the DC link voltage to the reference value. The switching of VSC will occur by Hysteresis based Pulse Width Modulation (PWM) current controller. The simulations are carried out by using MATLAB/simulink software to demonstrate the effectiveness of the proposed scheme.