Influenced by the operation characteristics of the Ultra-High Voltage(UHA)DC transmission system itself,it is difficult to realize rapid stabilization of the circulating current during the islanding operation phase,and the article proposes a study on the islanding operation control method of the UHV DC transmission system based on the Power Management Unit(PMU).Considering that the angle of output voltage will be changed instantaneously by the influence of Voltage Sourced Converters(VSC),the proposed active-phase angle sag control method,the inverter determines the reference coordinate system of Pike transformation through the synchronization signal of miniature PMU,and takes the target maintenance frequency of the islanded operation stage of UHV DC transmission system as the control benchmark.benchmark.Guided by adjusting the phase angle reference values of all Distributed Generation(DG)units in the UHV DC transmission system to be in a consistent state,the amount of active compensation is controlled by combining the common bus voltage phase angle parameter measured by the micro PMU.In the test results,the degree of deviation from the situation that occurs after the loop current reaches the value of 0 stabilizes within 10.0 VA and reaches the 0 steady state within 0.8 s after the test.
关键词
特高压直流输电系统/孤岛运行/目标维持频率/电压相角参数/有功补偿量
Key words
Ultra High-Voltage(UHA)direct current transmission system/island operation/target maintenance frequency/voltage phase angle parameter/amount of active compensation
维普
万方数据