Analysis of Frequency Characteristics for New Power System Considering Coordinated Participation of Multi-Type Energy Storage

With the gradual complexity of the active power-frequency coupling characteristics of the new power system, the traditional single energy storage grid-connected frequency regulation strategy has brought huge pressure to the primary frequency regulation of the power system. The participation mode of multi-type energy storage in primary frequency regulation and the frequency characteristics of the power grid under the coordinated control of energy storage need to be studied urgently. This paper studies the frequency response mechanism of electrochemical energy storage based on droop control and flywheel energy storage based on virtual synchronous machine control respectively. When multi-type energy storage participates in the primary frequency regulation of the power system, the low-pass filter link is used to process the frequency change rate signal to achieve the coordinated control effect of energy storage. Then, the coordinated control model of multi-type energy storage is combined with the power system containing new energy and traditional thermal power, and the frequency response model of the power system is established. The model is used to quantitatively analyze the influence of energy storage-related parameters on the system frequency change rate and steady-state frequency deviation, and the parameter sensitivity analysis is carried out. Finally, the model is built on Matlab/ Simulink to verify the influence of multi-type energy storage-related frequency regulation parameters on the system frequency characteristics. The research proves that considering the coordinated control of multi-type energy storage in the frequency regulation unit of the new power system can improve the frequency stability characteristics of the power system.