Primary Frequency Modulation Study of Receiver System with High Proportion Power Electronic Power Supplies

New energy, DC and other power electronic power supplies are connected to the grid through converters, weakening the equivalent inertia of the system and reducing the frequency regulation capacity, leading to the prominent problem of primary frequency regulation of the receiving-end grid. In this paper, we analyze the main contradictions of the frequency impact of high proportion power electronic power supplies on the receiving system by focusing on the control mode of power electronic power supplies. By constructing the frequency response model, the frequency response characteristics of the system and the principles followed when the power electronic power supply is involved in primary frequency regulation are analyzed. Finally, a four-machine, two-zone system containing wind power, photovoltaic, energy storage and DC is built by BPA to verify the effect of different control strategies of power electronic power supply on the primary frequency regulation of the system.