Power Quality Improvement of Hybrid Standalone Microgrid with DSTATCOM during Faults on Distribution Line

The voltage control of a wind energy based hybrid standalone Microgrid subjected to the faults on distribution feeders is presented in this paper. The effects of faults on the Microgrid are analyzed and required control measures are implemented to stabilize the turbine speed as well as to improve the quality of voltage at AC load bus. The controller of the existing maximum power point tracker (MPPT) is modified to limit the turbine speed during the fault(s). Distribution static shunt compensator (DSTATCOM) is further considered at AC load bus to provide the support for stabilizing the voltage during faults. Its novel control is presented to maintain the PCC voltages within allowable limits after occurrence of fault. Moreover, the connected DSTATCOM can also compensate for the reactive power demanded by the load. Further, with the help of DSTATCOM, torque pulsations induced in the generator due to unbalanced load are reduced. Fuel Cell and Electrolyzer are incorporated into the system to supply the reliable power at the load bus. The performance of Fuel Cell and Electrolyzer is also evaluated under the condition of fault. Extensive results based on case studies are presented in this paper with the help of MATLAB/SIMULINK package. The performances of proposed controllers are examined under unbalanced load as well as under different faults to show the satisfactory responses.