Study on Technologies and Applications of Joint Participation of Pumped Storage and Electrochemical Energy Storage in Power Grid Frequency Modulation

With the transformation of energy structure in China, the proportion of clean energy in the power system will further increase. The demand for flexible power supply in the system will grow visibly to ensure the safe and stable operation of the power system. As important flexible modulation resources, Pumped storage and electrochemical energy storage are complementary to each other in modulation performance, therefore, the joint participation of the two in frequency modulation is considered as a way to achieve complementary advantages. In line with the modulation characteristics and the principles of pumped storage and electrochemical energy storage, in this paper, a mathematical model of the two kinds of energy storage jointly participating in power grid frequency modulation based on virtual droop control strategy was established, and a simulation model on the control strategy of the joint frequency modulation was built in MATLAB/ Simulink. Taking a power grid in North China as an example, this paper simulated the improvement effect of frequency modulation performance under step load disturbance and continuous load disturbance, and verified the effectiveness of the model.