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发明公开
CN104993472A MMC-HVDC系统及其直流侧隔离装置和隔离方法 无效 - 驳回

MMC-HVDC系统及其直流侧隔离装置和隔离方法
摘要：
本发明实施例提供一种MMC-HVDC系统及其直流侧隔离装置和隔离方法，其中隔离装置包括：第一隔离开关、电流转移开关、输入输出端和一直流断路器；直流断路器一端接地，另一端与所有第一隔离开关相连；每个第一隔离开关分别通过电流转移开关与一输入输出端相连；电流转移开关包括：第一避雷器和与该第一避雷器并联连接的第一IGBT组或H桥组，第一IGBT组由N个第一IGBT和N个第二IGBT组成，H桥组包括N个相互串联的H桥电路，每个H桥电路包括1个第一电容和4个第三IGBT，N≥kU0/U1，N∈Z，可实现将MMC和多条直流电路与MMC-HVDC系统隔离，且节省了电网的投资成本。
摘要（英）：

The invention discloses an MMC-HVDC system, a DC side isolation device and an isolation method. The DC side isolation device comprises first isolation switches, current transferring switches, input/output terminals and a DC breaker. One terminal of the DC breaker is connected to the ground, and the other terminal is connected to all first isolation switches; each of the first isolation switches is connected to one input/output terminal through the current transferring switch; the current transferring switch comprises a first lightening arrester and a first IGBT group or an H bridge group, wherein either the IGBT group or the H bridge group is connected to the lightening arrester in parallel; the first IGBT group consists of N first IGBTs and N second IGBT groups; the H bridge comprises N H bridge circuits which are connected in parallel; and each of the H bridge circuit comprises a first capacitor and four third IGBTs, wherein N>=kU0/U1, E[element of]Z. The invention realizes the isolation between the MMC and the plurality of DC circuits and the MMC-HVDC system, and saves the investment cost of the power grid.

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