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Frequency changes in AC systems connected to DC grids: Impact of AC vs. DC side events

机译:连接到直流电网的交流系统中的频率变化:交流与直流副事件的影响

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Each converter station within a DC grid can be equipped with a power frequency droop control loop in addition to the power voltage droop control normally used for autonomous power sharing. Presence of the power frequency droop control allows exchange of frequency support among the AC systems connected to the DC grid. Following an event (or disturbance), there are two distinctly different patterns of dynamic variation of the frequencies of the AC systems connected to the DC grid. In this paper, an analytical basis is provided to support the different trends. Simulation results using a 4-terminal DC grid model set up in DIgSILENT PowerFactory are used to validate the analysis. The different patterns of dynamic variation of the frequencies for AC and DC side disturbances could have significant implications for extraction of inertial/frequency support from offshore wind farms connected through MTDC grids.
机译:除了通常用于自主电源共享的电源电压下降控制外,DC电网中的每个换流站都可以配备电源频率下降控制环路。功率频率下降控制的存在允许在连接到直流电网的交流系统之间交换频率支持。在发生事件(或干扰)之后,连接到直流电网的交流系统的频率有两种截然不同的动态变化模式。本文为支持不同趋势提供了分析基础。使用在DIgSILENT PowerFactory中设置的4端子DC电网模型的仿真结果可用于验证分析。交流和直流侧扰的频率动态变化的不同模式可能对通过MTDC电网连接的海上风电场提取惯性/频率支持具有重要意义。

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