Application of STATCOM With Photovoltaic Systems

Abstract

Static Synchronous Compensators known as (STATCOMs) are often used in power system transmission networks as voltage regulators and VAR compensators. This research proposes the integration of STATCOMs in distribution networks, particularly in PV grid-connected systems that use distributed energy resources in order to minimize active and reactive power demand from the grid by delivering variable reactive power from an alternate supply that adjusts to the load demand. This decreases the dependence on the utility power supply and promotes the integration of STATCOMs with renewables. Complete case studies comparing the applications of STATCOM, a voltage source converter with a decoupled active and reactive power control algorithm, and a fixed reactive power compensating condenser for the purpose of dynamic VAR compensation to loads connected at the point of common coupling in a grid-connected photovoltaic (PV) system are presented. The goal of this study is to investigate how dynamic loads, such as induction motors, behave under steady-state conditions when the supply's reactive power demand rises, as well as how this demand variance affects the network that supplies these loads. Complete system modeling and analysis for both scenarios, the fixed reactive power compensator and the STATCOM, supplying various load demands, have been developed. The simulation is based on a 100-kW rated PV grid-connected system to simulate behavior and performance of such study. Adaptive Neuro Fuzzy Inference System with Particle Swarm Optimization was used to extract the maximum power point of the PV array proceeded by a sliding mode controller. MATLAB/ Simulink was developed for modelling and analysis. Various load dynamics with varying solar irradiance and increasing reactive power demand of the associated load were simulated to evaluate various challenges and disturbances on the power supply.