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借助实时数字仿真器研究了特高压直流工程一极中单换流单元运行时在线投入另一个换流单元,或当一极中双换流单元运行时在线退出其中一个单换流单元的控制策略。研究结果表明:零功率解锁方式及小触发角解锁方式均可行,且零功率解锁方式下触发角约85°,而小触发角解锁方式下触发角不得低于70°;在线投入一组换流单元时,只要配合得当,整流侧先解锁、逆变侧后解锁和逆变侧先解锁、整流侧后解锁2种方式均可实现目标;从安全可靠、交直流系统扰动小等方面考虑,在线投入一组换流单元时可采用零功率解锁方式、整流侧先解锁,而在线退出一组换流单元时,逆变侧应先进行退出控制,以有利于整组换流单元的退出。
The real-time digital simulator was used to study the control strategy of one single commutation unit in one pole of UHVDC project put online into another commutation unit or out of one of the single commutation units when two commutation units in one pole were operating . The results show that both the zero-power unlocking method and the small firing angle unlocking method are feasible, and the firing angle under zero-power unlocking mode is about 85 °, while the firing angle under the small firing angle unlocking method is not less than 70 °. As long as the unit is properly matched, the rectifier side can be unlocked first, the inverter side can be unlocked and the inverter side can be unlocked first, and the rectifier side can be unlocked after the other two ways can be achieved. From the aspects of safety and reliability, small AC / DC system disturbance, When a set of commutation units is put into operation, the zero-power unlocking method can be adopted. The commutating side can be unlocked first. When a set of commutation units are online, the inverter side should first exit the control so as to facilitate the exit of the entire set of commutation units.