Grid-Tied Battery Integrated Wind Energy Generation System with Ability to Operate Under Adverse Grid Conditions

Abstract

An efficient control of a grid integrated microgrid system with wind energy generating system (WEGS) and battery storage, is proposed in this work. The quality of power injected to the utility is deteriorated with the level of unbalance and/or distortions present in the grid voltages. To compensate for the abnormalities, such as unbalance and distortions in grid voltages, positive sequence components (PSCs) of grid voltages are extracted from their filtered $\alpha\beta$ components. This work proposes a hybrid generalized integrator (HGI) filter for filtering the $\alpha\beta$ components of grid voltages and also provides its 90circ delayed signals, which are useful in generating PSCs. Phase and frequency of grid currents are decided by the unit active templates derived from PSCs of grid voltages, therefore, highquality grid currents are injected into the grid even for abnormal grid conditions. For faster dynamics during variations in load power, HGI filters are used for quick and accurate estimation of fundamental components of load currents. Intermittent power generation from WEGS is compensated for by integrating a battery bank into the system. Along with high-quality power injection, grid side converter (GSC) also maintains unity power factor at the point of common coupling (PCC). A 3. 7kW speed sensorless synchronous reluctance generator (SynRG) is used in WEGS, which is controlled by the machine side converter (MSC). The SynRG along with MSC control extracts maximum available power from the wind turbine (WT). Proposed control techniques are validated in Matlab/Simulink platform, and experimental validation is done on a developed laboratory prototype.