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CN107534394A 具有导向开关的模块化多电平换流器 无效 - 撤回

具有导向开关的模块化多电平换流器
摘要：
在高电压直流电(HVDC)电力传输领域中，一种电压源换流器(10)包括至少一个换流器分支(12)，所述换流器分支包括用于在使用中连接到DC网络(18)的第一和第二DC端子(14，16)。所述至少一个或每一个换流器分支(12)包括由用于在使用中连接到AC网络(24)的AC端子(22)分离的第一与第二分支部分(20A，20B)。每一分支部分(20A，20B)包括与链节式换流器(28A，28B)串联连接的主开关元件(26A，26B)，所述链节式转换器可操作以提供阶梯式可变电压。所述电压源换流器(10)还包括控制单元(36)，所述控制单元被编程以：使所述第一第二分支部分(20A，20B)中的每一个中的所述主开关元件(26A，26B)在导电配置与非导电配置之间切换，以使所述对应链节式转换器(28A，28B)选择性地在加入电路与退出电路之间切换，由此每一主开关元件在处于其非导电配置时在非电压支持状态与电压支持状态之间转变；以及在切换为退出电路时操作每一个所述链节式转换器(28A，28B)以产生变化的电压波形(38A，38B)，从而减小所述对应主开关元件(26A，26B)在处于其电压支持状态时所承受的电压范围(40；48)。
摘要（英）：

In the field of high voltage direct current (HVDC) power transmission, a voltage source converter (10) comprises at least one converter limb (12) that includes first and second DC terminals (14, 16) for connection in use to a DC network (18). The or each converter limb (12) includes first and second limb portions (20A, 20B) which are separated by an AC terminal (22) for connection in use to an ACnetwork (24). Each limb portion (20A, 20B) includes a primary switching element (26A, 26B) which connected in series with a chain-link converter (28A, 28B) that is operable to provide a stepped variable voltage. The voltage source converter (10) also includes a control unit (36) which is programmed to: switch the primary switching element (26A, 26B) in each of the first and second limb portions (20A, 20B) between conducting and non-conducting configurations to selectively switch the corresponding chain-link converter (28A, 28B) in and out of circuit, whereby each primary switching element while in its non-conducting configuration transitions between a non-voltage supporting state and a voltage supporting state; and operate each chain-link converter (28A, 28B) while switched out of circuitto generate a varying voltage waveform (38A, 38B) to reduce the voltage range (40; 48) the corresponding primary switching element (26A, 26B) is exposed to while in its voltage supporting state.

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