Methods of smoothing active power fluctuations of photovoltaic plants using the full size converter based variable speed pumped storage unit

This paper proposes a method of smoothing photovoltaic (PV) power fluctuations by using the full size converter based variable speed pumped storage unit (FSCVSPSU). The system models and control strategies of the FSCVSPSU are briefly discussed before analyzing its fast power response characteristics. The empirical mode decomposition (EMD) algorithm is used to decompose the PV output power to quickly and accurately determine the real-time active power compensation of the FSC-VSPSU. Simulation results indicate that the proposed methods can effectively reduce the power fluctuations of PV power by dynamically and quickly adjusting the FSC-VSPSU output power, ensuring that the final power fluctuations can meet the grid code.