De-loaded Low-Voltage Ride-Through control and Primary Frequency Control for AC-Microgrid based PMSG Enhanced by Battery

The main objective of this study is to enhance the Low-Voltage Ride-Through (LVRT) control approach in grid-connected Microgrid and primary frequency control in Islanded-Microgrid using de-loaded control. Indeed, to increase the integration into the distribution systems, microgrids (MGs) must be capable to support the grid disturbance, supply the load, and provide ancillary services. To exhibit the efficiency of the suggested grid-connected MG approach, this study highlights the comparison of de-loaded-LVRT control with Maximum Power Point Tracking-LVRT (MPPT-LVRT) control. However, if the fault exceeds the standards given by the grid code, the variable Load-Demand will be automatically supplied by the Isolated-MG-based Permanent Magnet Synchronous Generator-Wind Turbines (PMSG-WTs) and Battery Energy Storage System (BESS). Whereas, BESS is added aiming to provide additional active power during the grid fault. In addition, to control the PMSG-side the Pulse Width Modulation (PWM) based Fuzzy Logic Controller (FLC) is proposed. To regulate the PMSG-pitch angle and to participate in primary frequency regulation, a comparison between De-loaded Control and MPPT Control is studied. The effectiveness of the adopted approaches is demonstrated via MATLAB/Simulink software.