1results about How to "High stability" patented technology

The application provides a power grid frequency modulation method and device based on MMC bridge arm capacitor multiplexing, and relates to the technical field of power grid frequency control. In view of the function conflict problem between the participation of the MMC bridge arm capacitor in power grid frequency control and voltage stabilization and filtering, the MMC bridge arm sub-module is transformed in a full-bridge type multiplexing mode, the MMC power throughput capacity is enhanced in a parallel super capacitor mode, the regulation and control of the bridge arm capacitor on voltage fluctuation is enhanced, and the support capacity on the power grid frequency is simultaneously improved; the principle and method of the participation of the MMC in the power grid frequency support are analyzed by simulating the frequency characteristics of a synchronous machine, the power grid frequency modulation model of the participation of the MMC in the MTDC system is constructed, the power grid frequency modulation method of the participation of the MMC in the MTDC system is optimized, the frequency deviation generated when the active power of the power grid and the load demand are unbalanced is taken as the input of the frequency modulation model, and corresponding frequency modulation strategies are adopted based on the frequency modulation demand of the MTDC system. The application can realize the reasonable distribution of the power required for frequency modulation, and improve the comprehensive stability characteristics of the new power system.