Power fluctuation suppression and frequency modulation control method based on hybrid energy storage system

The invention provides a power fluctuation suppression and frequency modulation control method based on a hybrid energy storage system. The method comprises the steps: obtaining a wind power fluctuation quantity through calculation according to the first output power of a wind power plant; calculating to obtain a filtering time constant according to the first output power, the wind power fluctuation quantity, the system frequency offset of the power system, the frequency change rate, the real-time charge state of the hybrid energy storage system and the second output power; performing high-pass filtering processing on the first output power by using the filtering time constant to obtain third output power of the hybrid energy storage system; performing low-pass filtering processing on thethird output power by using a preset filtering time constant to obtain fourth output power of the battery and fifth output power of the supercapacitor, wherein the battery suppresses wind power fluctuation and controls wind p