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Enhanced AC voltage and frequency control of offshore MMC station for wind farm connection

机译：用于海上风电场连接的海上MMC站的增强交流电压和频率控制

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摘要

Connecting large offshore wind farms using high-voltage direct current (HVDC) transmission systems based on the modular multilevel converter (MMC), the offshore alternating current (AC) voltage and frequency are regulated by the offshore MMC station and are important for the stable wind power generation and transmission. This study proposes an enhanced AC voltage and frequency control strategy of the offshore MMC for wind farm integration, where an additional frequency loop is used to improve its AC voltage and frequency controllability. A fault current injection control is also proposed, where the offshore MMC station actively provides fault currents during an offshore AC fault to enable overcurrent protection for the network. To ride-through onshore AC faults, a direct current (DC) voltage-dependent AC voltage controller is introduced to actively reduce the offshore AC voltage during an onshore AC fault to alleviate the DC overvoltage of the HVDC system. Simulation results in normal operation and during offshore and onshore faults confirm the feasibility of the proposed control scheme.
机译：使用基于模块化多电平转换器（MMC）的高压直流（HVDC）传输系统连接大型海上风电场，海上交流电（AC）的电压和频率由海上MMC站进行调节，对于稳定风能至关重要发电和输电。这项研究为海上风电场集成提出了海上MMC的增强型交流电压和频率控制策略，其中使用了附加的频率环路来改善其交流电压和频率可控性。还提出了故障电流注入控制，其中，海上MMC站在海上AC故障期间主动提供故障电流，以实现对网络的过流保护。为了解决陆上交流故障，引入了依赖于直流（DC）电压的交流电压控制器，以在陆上交流故障期间主动降低海上交流电压，以减轻HVDC系统的直流过电压。在正常操作以及海上和陆上故障期间的仿真结果证实了所提出的控制方案的可行性。

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