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Invention Publication
CN108535560A 一种多直流馈入系统直流之间耦合程度的表征方法及系统 无效 - 驳回

一种多直流馈入系统直流之间耦合程度的表征方法及系统
Abstract:
本发明公开了一种多直流馈入系统直流之间耦合程度的表征方法及系统，包括：仿真直流逆变站A发生内部故障，并分别获取直流逆变站A和邻近直流逆变站B发生畸变的交流电压数据；根据所述直流逆变站A和邻近直流逆变站B的交流电压数据利用电压谐波畸变率计算公式分别计算直流逆变站A和邻近直流逆变站B的交流电压谐波畸变率；计算直流逆变站A的交流电压谐波畸变率和邻近直流逆变站B的交流电压谐波畸变率的比值作为直流逆变站A和邻近直流逆变站B的交流电压畸变耦合系数。本发明能够描述多馈入直流逆变站之间相互影响的强弱，且体现了直流输送容量大小对整个系统的影响程度，能够把多直流馈入系统和全部交流网络作为一个整体来进行评价。
Abstract(English):

The invention discloses a method and system for representing the coupling degree between DCs of a multi-DC feed-in system. The method comprises steps of simulating that a DC inverter station generatesan internal fault, and acquiring the distorted AC voltage data the DC inverter station A and an adjacent DC inverter station B; calculating the AC voltage harmonic distortion rates of the DC inverter station A and the adjacent DC inverter station B by using a voltage harmonic distortion rate calculation formula according to the AC voltage data of the DC inverter station A and the adjacent DC inverter station B; and calculating a ratio of the AC voltage harmonic distortion rate of the DC inverter station A and the AC voltage harmonic distortion rate of the adjacent DC inverter station B as an AC voltage distortion coupling coefficient of the DC inverter station A and the adjacent DC inverter station B. The method and system can describe the mutual influence degree between the multi-feed-in DC inverter stations, and reflect the influence degree of DC transmission capacity on the whole system, and can comprehensively evaluate the multi-DC feed-in system and the whole AC network.

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