海上风电柔直并网系统主动能量控制与交流耗能装置协同策略

Cooperative Strategy of Active Energy Control and AC Energy Dissipation Device in Offshore Wind Power MMC-HVDC System

针对目前海上风电柔直并网系统采用直流耗能装置存在的工程经济性差、能量浪费等问题,该文提出一种能够协同交流耗能装置运行的主动能量控制策略。首先,通过计算柔直系统能量裕度,定量地验证基于主动能量控制的盈余功率解决方案的可行性。随后,提出柔直换流器交直流电流对偶控制技术,构建换流器的电容能量控制器。进一步考虑交流耗能装置的运行特性,提出换流器能量–交流电压控制器。在此基础上,设计可充分利用柔直系统能量裕度的主动能量控制与交流耗能装置协同控制方法。最后,在PSCAD/EMTDC仿真平台中搭建典型海上风电柔直并网系统的仿真模型,对不同故障类型的交流故障进行仿真,验证所提主动能量控制与交流耗能装置协同策略的有效性。

Aiming at the problems of poor engineering economy and energy waste in offshore wind power flexible direct grid connection system using DC energy consuming devices,this paper presented an active energy control technique for cooperating AC energy dissipation devices.Firstly,the feasibility of active energy control method was verified quantitatively by computing the system’s energy margin.Subsequently,an AC/DC current dual control of MMC was provided,and the capacitor energy controllers of the converter were constructed.Further considering the operating of AC energy dissipation devices,a converter energy-AC voltage controller was proposed.On this basis,a cooperative control for active energy control and AC energy dissipation devices was designed.Finally,a simulation model of a typical offshore wind power MMC-HVDC integration system was built in the PSCAD/EMTDC,and the AC faults of different fault types were simulated to verify the effectiveness of the cooperative strategy of active energy control and AC energy dissipation devices.