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Active / Passive Switching Control Strategy for MMC-HVDC Connected to Island Power Grid

机译：MMC-HVDC接入孤岛电网的主动/被动开关控制策略

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Modular Multilevel Converter based High-voltage Direct Current (MMC-HVDC) can provide power to important areas such as island power grids. When island power grids are in the process of active and passive network switching,there are unstable problems such as active power imbalance and AC voltage oscillation. Therefore, an active / passive switching control strategy for MMC-HVDC connected to island power grid is proposed. This control strategy is optimized for outer loop power control and phase angle control, which eliminates the instantaneous active power imbalance of the island power grid at the moment of active / passive network switching, and can achieve a smooth switching of the island power grid. Finally, a three-phase MMC simulation model was built in PSCAD / EMTDC. The simulation results show that under the action of the proposed control strategy, the system can operate normally at the time of active, passive and both switching times, verify the effectiveness and correctness of the proposed control method.
机译：基于模块化多电平转换器的高压直流电（MMC-HVDC）可以为重要区域（例如，岛上电网）提供电源。当岛上电网处于主动和被动网络切换过程中时，会出现不稳定的问题，例如有功功率不平衡和交流电压振荡。因此，提出了一种用于岛上电网的MMC-HVDC的主动/被动开关控制策略。该控制策略针对外环功率控制和相角控制进行了优化，从而消除了主动/被动网络切换时孤岛电网的瞬时有功功率不平衡，并可以实现孤岛电网的平稳切换。最后，在PSCAD / EMTDC中建立了一个三相MMC仿真模型。仿真结果表明，在所提出的控制策略的作用下，该系统可以在主动，被动和两个切换时间同时正常运行，验证了所提出控制方法的有效性和正确性。

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