Power quality improvement in distributed system using dvr an intelligent control scheme

Abstract

newline With increase in renewable sources feeding the state and national grids, the regulatory norms and grid codes are expecting high disciplines in power quality. Starting of large motors, transformers or energizing huge capacitors without proper VAR compensators results in voltage sags and swells. With wind turbines directly connected to the grid, any voltage imbalances like voltage sag will result in impacting the electromagnetic torque on the induction generator, leading to mismatch between electromagnetic and mechanical torque. This mismatch will damage the rotor winding and further the machine bridge side of the VSC converter. Similarly, any voltage sag seen by the solar inverter, shall see huge line current in the inverter due to sudden rate of change of grid voltage. This huge line current will eventually increase the thermal behaviour of the inverter, heating up the filter circuit and further conducting the anti-parallel diodes across the IGBTs. newlineSTATCOMs, SVCs, BESS are various compensators out of which DVR (Dynamic Voltage Restorer) out beats the rest by its superior performance. However, the control system of DVR plays a vital role, which in fact should quickly identify the voltage sag and let the hardware to respond. newlineContingent upon the issues of PQ the MGSA enhances the required amount of control signal to the converter for recoup the initial operating condition. With the help of the proposed technique, the PQ issues are mitigated with advancement in fast execution and closeness to the exact value in decreasing the SAG issues for any sensitive loads connected to the distribution system. Hence this work is executed and assessed using MATLAB / simulink platform at different stages like KF, EKF, PSO and ABC. Thus the proposed work reveals that the examination exhibits the newlineprevalence of the proposed approach and affirms its capability to take care of the PQ issues and upgrade the execution of the DVR in the distribution systems. newlinePresent work focuses on advanced control technique called Modified Gravitati