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Impedance-based Approach for High Frequency Interaction Analysis of MMC Systems

机译:基于阻抗的MMC系统高频交互分析方法

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Modular Multi-level Converter (MMC) and its Valve Base Controller (VBC) are generally provided by one manufacturer. MMC and VBC operate together with ac network, dc system, and Pole Controller and Protection (PCP) system. Therefore, the MMC system is potential to interact with any of these parts in a wideband frequency range. This paper focuses on the interaction between the MMC system and the PCP system. By using a frequency scanning approach for the CIGRE DCSI MMC one terminal case, the MMC system admittance characteristic is obtained firstly in RTDS simulation. Then the closed-loop stability of the MMC system and PCP control system is analyzed through Bode Plot. With the designed DCSI MMC system, the larger gains of the inner-loop PI controller are the root causes of high frequency interaction between the MMC system and PCP control system. Finally, the conclusion is validated in RTDS time domain simulation.
机译:模块化多级转换器(MMC)及其阀门基础控制器(VBC)通常由一个制造商提供。 MMC和VBC与AC网络,直流系统和极控制器和保护(PCP)系统一起运行。因此,MMC系统是与宽带频率范围内的任何这些部件交互的潜力。本文重点介绍了MMC系统与PCP系统之间的交互。通过使用CIGRE DCSI MMC一个终端壳体的频率扫描方法,首先在RTDS仿真中获得MMC系统导纳特性。然后通过Bode Plot分析MMC系统和PCP控制系统的闭环稳定性。通过设计的DCSI MMC系统,内环PI控制器的较大增益是MMC系统和PCP控制系统之间的高频交互的根本原因。最后,结论是在RTD时域模拟中验证。

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