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Invention Application
WO2014177340A2 CONVERTER 审中-公开

CONVERTER
Abstract:
A voltage source converter (30) comprises: a converter limb (36) extending between first and second DC terminals (32,34) and having first and second limb portions (38,40) separated by an AC terminal (42), the first and second DC terminals (32,34) being connectable to a DC electrical network (44) and the AC terminal (42) being connectable to an AC electrical network (46), each limb portion (38,40) including a primary switching element (48), the primary switching element (48) of each limb portion (38,40) being switchable to switch the corresponding limb portion (38,40) into and out of circuit between the corresponding DC terminal (32,34) and the AC terminal (42) to control the configuration of an AC voltage at the AC terminal (42); an auxiliary limb (50) including an auxiliary converter, the auxiliary converter including at least one auxiliary switching element, the auxiliary limb (50) being connected to the AC terminal (42), the primary switching element (48) of each limb portion (38,40) being switchable to switch the auxiliary limb (50) into and out of circuit with the corresponding limb portion (38,40) and thereby switch the auxiliary limb (50) into and out of circuit with the corresponding DC terminal (32,34); and a control unit to selectively control the switching of the or each auxiliary switching element of the auxiliary converter to control the auxiliary limb (50) as a current source in a primary operating mode to inject a circulation current (68) that flows in one direction in one of the first and second limb portions (38,40) to minimise a limb portion current (66) flowing in the opposite direction in that limb portion (38,40), wherein each primary switching element (48) switches the respective limb portion (38,40) into or out of circuit between the corresponding DC terminal (32,34) and the AC terminal (42), following the minimisation of the limb portion current (66) by the circulation current (68), when a minimal or zero current flows through the corresponding primary switching element (48) during the commutation of current from one of the first and second limb portions (38,40) to the other of the first and second limb portions (38,40).
Abstract(Chinese):

电压源转换器（30）包括：转换器臂（36），其在第一和第二DC端子（32,34）之间延伸并且具有由AC端子（42）分开的第一和第二肢体部分（38,40），第一 以及可连接到DC电网（44）的第二DC端子（32,34），并且AC端子（42）可连接到AC电网（46），每个支路部分（38,40）包括主开关元件 （48），每个肢体部分（38,40）的主开关元件（48,40）可切换以将对应的肢体部分（38,40）切换到相应的DC端子（32,34）和 交流端子（42），用于控制交流端子（42）处的交流电压的配置; 包括辅助转换器的辅助肢体（50），所述辅助转换器包括至少一个辅助开关元件，所述辅助肢体（50）连接到所述AC端子（42），所述肢体部分的主开关元件（48） 38,40）可切换成将辅助肢体（50）与对应的肢体部分（38,40）切换到电路中，从而将辅助肢体（50）与相应的直流端子（32）进入和离开电路 ，34）; 以及控制单元，用于选择性地控制所述辅助转换器的每个辅助开关元件的切换以在主操作模式中将辅助臂（50）控制为电流源，以注入在一个方向上流动的循环电流（68） 在所述第一和第二肢体部分（38,40）中的一个中，以使在所述肢体部分（38,40）中沿相反方向流动的肢体部分电流（66）最小化，其中每个主要开关元件（48）将相应的肢体 （38,40）在相应的直流端子（32,34）和交流端子（42）之间的电路中进入或退出电路之后，当通过循环电流（68）使肢体部分电流（66）最小化时， 在将电流从第一和第二肢体部分（38,40）中的一个转换到第一和第二肢体部分（38,40）中的另一个的过程中，最小或零电流流过相应的一次开关元件（48）。

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