Droop Control Approach to Reduce Frequency Deviation and Enhance Active and Reactive Power sharing

This paper proposes an improved performance of droop control of Distributed Generator (DG) in frequency deviation, power sharing and voltage regulation at Point Common Coupling (PCC) during ON/OFF operations mode or during substantial change in load. A cascade control of speed droop and voltage droop is proposed which allows the voltage control to be increased/decreased during load variation known as a Load Acceptance Module (LAM). Therefore, the first speed droop control estimates the transient amount of reactive power induced during load variation or ON/OFF mode of operation. Whereas, the second voltage droop control injects the voltage at PCC to reduce the frequency deviation. A power droop control applied to the diesel generator is used to ensure active and reactive power sharing within the micro-grid whether in stand-alone mode or in grid-connected mode. The combination of the two droop controls applied to the diesel power plant optimizes the operating performance of the micro-grid and contributes to its stability.