Direct power control strategy based variable speed pumped storage system for the reduction of the wind power fluctuation impact on the grid stability

Abstract

Harnessing wind energy is the most rapidly growing amongst the renewable energy sources. However, because of its intermittency nature, wind power results in unfavorable influences on power system operations and stability. The voltage flicker and grid frequency fluctuation are significant in this regard. To minimize the effect of wind power fluctuations on the grid frequency and AC bus voltage, this paper presents direct power control strategy-based variable speed pumped storage system. Modeling of the system is undertaken based on phasor model technique. The case study is made by considering conventional synchronous machines for hydropower and thermal power plans in the grid and induction machines for the VSPS and wind turbines. The performance is analyzed using MATLAB/Simulink platform. The results show that the proposed VSPS control strategy achieves well-regulated and stable grid frequency and AC voltage in the power system.