Active Power Coordination Control Method of Converter Stations of MMC-DC System and UPFC in Jiangsu Power Grid Interconnected with the Large-Scale Wind Power
With the proposal and implementation of the"emission peak and carbon neutrality"strategy,China will focus on building a new power system based on renewable energy.However,large-scale integration of renewable energy such as wind power will bring threats and challenges to the new power system with the characteristics of AC/DC hybrid connection.Based on the analysis of Jiangsu Power Grid at the end of the 14th Five-Year Plan,it is noticed that under the background of large-scale wind power integra-tion,the problem of 500 kV AC transmission lines overload after N-1 faults need to be solved urgently.Therefore,based on the comprehensive sensitivity calculation method,an active power coordination control method is proposed,in which the modular multilevel converters(MMCS)of DC systems and the unified power flow controller(UPFC)are used to optimize the power flow distribution and eliminate the potential line overload.Finally,taking Jiangsu Power Grid as an example,simulation analysis is conducted to perform the active power coordinated control method on Suzhou 500 kV UPFC,Baihetan-Jiangsu DC system and a planned three-terminal DC system based on MMC.The simulation results show that the proposed coordinated control method can ef-fectively eliminate the line overload after N-1 faults when applied to Jiangsu Power Grid.In addition,the proposed method has advantages over typical optimization methods in terms of computational speed.
wind power integrationmodular multilevel converter(MMC)unified power flow controller(UPFC)coordination controlhybrid cascade DC system
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