New Control Strategy Based PV- STATCOM for Mitigation of Power Oscillation Damping

Flexible AC Transmission Systems (FACTS) like the Static Synchronous Compensator (STATCOM) are commonly employed to enhance the performance and stability of power networks. This study introduces a photovoltaic (PV)-based STATCOM system, referred to as PV-STATCOM, which incorporates a Fuzzy Logic Controller (FLC) to effectively mitigate power oscillations. The core functionality of the proposed system involves temporarily suspending the PV system’s real power output during daytime disturbances. When oscillations are detected, the PV inverter halts energy production for a brief period—typically a few seconds—and instead operates in a mode that utilizes its full capacity to dampen the oscillations. Once stability is achieved, the inverter resumes its power generation role in a gradual manner, ensuring a smooth transition and quicker recovery compared to traditional grid code-based responses. During nighttime, when the PV system does not generate real power due to lack of sunlight, the inverter continues to function fully as a STATCOM for oscillation damping. Simulation results conducted in MATLAB confirm that the proposed system significantly improves power transfer capacity under various dynamic conditions. Additionally, the PV-STATCOM offers a cost-effective solution compared to conventional STATCOM devices, potentially resulting in considerable savings for utilities involved in power generation and distribution.