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发明授权
CN108418448B 一种具有直流故障自清除能力的MMC换流器子模块电路 失效 - 权利终止

一种具有直流故障自清除能力的MMC换流器子模块电路
摘要：
本发明属于电力系统继电保护和自动化领域，涉及一种具有直流故障自清除能力的MMC换流器子模块电路,将两个半桥结构的子模块SM1和SM2反向串联连接，构成一个结构单元，每个半桥结构的子模块包括三路并联线路，一路为电容C、一路为串联的两个二极管D1、D2，一路为串联的两个IGBT，第一二极管D1的阴极与第二二极管D2的阳极相连，第一IGBT的发射极与第二IGBT的集电极相连，第一二极管D1的阳极、第一IGBT的集电极与电容C的正极相连；其中一个子模块的电容电压额定值为2Udc，另一个子模块的电容电压额定值为Udc，两者方向相反，以便于形成反压用于截至二极管。
摘要（英）：

The invention belongs to the field of relay protection and automation of electric power systems, and relates to an MMC converter submodule circuit with a direct-current fault self-clearing capability.Sub-modules SM1 and SM2 of two half-bridge structures are reversely connected in series to form a structure unit. Each sub-module of each half-bridge structure comprises three parallel lines, of which one path is a capacitor C, another path is two diodes D1 and D2 which are connected in series, and still another path is two IGBTs which are connected in series. The cathode of the first diode D1 isconnected with the anode of the second diode D2. The emitting electrode of the first IGBT is connected with a collector electrode of the second IGBT, the anode of the first diode D1 is connected withthe anode of the first IGBT, and the collector of the first IGBT is connected with the positive electrode of the capacitor C. The rated capacitor voltage of one of the sub-modules is 2 Udc, the ratedcapacitor voltage of the other sub-module is Udc, and the directions of the capacitor voltage of the two sub-module are opposite to each other so as to form a reverse voltage for stopping the diodes.

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