Improved Widrow-Hoff Based Adaptive Control of Multi-Objective PV-DSTATCOM System

This paper presents a control of multi-objective solar photovoltaic-distribution static compensator (PV-DSTACOM) feeding nonlinear load connected at PCC (Point of Common Coupling). It utilizes an improved Widrow-Hoff based adaptive control algorithm to control the voltage source converter (VSC) for enhancing the power quality of the distribution system. The Widrow-Hoff method is used to revise two weights to appraise the load fundamental active component and the supply voltages. The P&O algorithm is used to extract the peak power and to calculate the duty ratio of the boost converter. For fast dynamics response, the DC link voltage is held at a set value by PI controller and its output is considered as a loss component of the current, which represents the losses in the VSC. A constant learning rate is chosen for updating the weight of adaptive control, which shows the good dynamic response and the accuracy. The performance of the proposed system is validated through simulated and test results in various dynamic conditions.