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Application of virtual synchronization control strategy in MMC based VSC-HVDC system

机译:虚拟同步控制策略在基于MMC的VSC-HVDC系统中的应用

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In this paper the virtual synchronization control strategy is applied to MMC based VSC-HVDC system to improve the performances of stable state and dynamic state. The small signal model of the virtual synchronization controller is built to show the performance when the system is subjected to small interferes. Then the characteristics of the system in different operation state are analyzed. As the virtual synchronization control can be self-synchronized automatically with the grid without requiring any dedicated physical synchronization control units, the MMC based VSC-HVDC system can track the grid frequency accurately after connected to the grid. When the grid fails or needs offline maintenance, it can continue to operate in islanded mode. The validity and effectiveness of the proposed control strategy is verified by extensive simulations in PSCAD/EMTDC.
机译:本文将虚拟同步控制策略应用于基于MMC的VSC-HVDC系统,以提高稳定状态和动态状态的性能。建立虚拟同步控制器的小信号模型以显示系统受到较小干扰时的性能。然后分析了系统在不同运行状态下的特性。由于虚拟同步控件可以与电网自动自动同步,而无需任何专用的物理同步控制单元,因此基于MMC的VSC-HVDC系统在连接到电网后可以准确跟踪电网频率。当网格发生故障或需要脱机维护时,它可以继续以孤岛模式运行。 PSCAD / EMTDC中的大量仿真验证了所提出控制策略的有效性和有效性。

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