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发明公开
EP2755315A1 Hybrid modular converter 审中-公开
Stromrichter

Hybrid modular converter
摘要：
A voltage source converter (30) comprises a converter limb (36), the converter limb (36) extending between first and second DC terminals (32,34) and having primary and secondary limb elements connected in parallel between the first and second DC terminals (32,34), each DC terminal (32,34) being connectable to a DC electrical network (44), the primary limb element including first and second primary limb element portions (38,40) separated by a third terminal (42), the third terminal (42) being connectable to an AC electrical network (46), each primary limb element portion (38,40) including at least one primary switching element (50), each primary switching element (50) being switchable to switch the corresponding primary limb element portion (38,40) into and out of circuit between a respective one of the DC terminals (32,34) and the third terminal (42), the secondary limb element including first and second secondary limb element portions (52,54) separated by a junction (56), each secondary limb element portion (52,54) including a DC side chain-link converter (58), each chain-link converter (58) including a plurality of series-connected modules (60), each module (60) of each chain-link converter (58) including at least one secondary switching element and at least one energy storage device, the or each secondary switching element and the or each energy storage device in each module (60) combining to selectively provide a voltage source, the converter limb (36) further including a connection interconnecting the third terminal (42) and the junction (56) to form a star configuration in which a first branch of the star configuration includes the connection, a second branch of the star configuration includes the first secondary limb element portion (52), a third branch of the star configuration includes the second secondary limb element portion (54) and the junction (56) defines a mid-point of the star configuration, wherein the voltage source converter (30) further includes a control unit (62) which controls the switching of each primary switching element to switch the corresponding primary limb element portion (38,40) into and out of circuit between the corresponding DC terminal (32,34) and the third terminal (42) to selectively transfer power between the AC and DC electrical networks (46,44) via each of the primary limb element portions (38,40), the control unit (62) further controlling the switching of the or each secondary switching element in each module (60) of each DC side chain-link converter (58) to control the configuration of an AC voltage waveform at the third terminal (42).
摘要（中）：

电压源转换器（30）包括转换器臂（36），转换器臂（36）在第一和第二DC端子（32,34）之间延伸并具有并联连接在第一和第二DC端子 （32,34），每个直流端子（32,34）可连接到直流电网（44），所述主支路元件包括由第三端子（42）分开的第一和第二主支路元件部分（38,40） ，所述第三端子（42）可连接到AC电网（46），每个初级肢体元件部分（38,40）包括至少一个主开关元件（50），每个主开关元件（50）可切换以切换 在相应的一个直流端子（32,34）和第三端子（42）之间的相应的主要肢体元件部分（38,40）进入和离开电路，次级肢体元件包括第一和第二辅助肢体元件部分 52,54），由连接点（56）分隔，每个第二个 每个链节转换器（58）包括多个串联连接的模块（60），每个链条转换器（58）包括多个串联连接的模块（60），每个链条转换器（58） 链路转换器（58），包括至少一个次级开关元件和至少一个能量存储装置，每个模块（60）中的或每个次级开关元件和/或每个能量存储装置组合以选择性地提供电压源，转换器臂 （36）还包括连接所述第三端子（42）和所述接头（56）的连接，以形成星形结构，其中所述星形结构的第一分支包括所述连接，所述星形结构的第二分支包括所述第一辅助臂 元件部分（52），星形结构的第三分支包括第二辅助肢体元件部分（54），并且接合部（56）限定星形结构的中点，其中电压源转换器（30）还包括 控制单元（62），其控制每个初级开关元件的切换以将相应的主支路元件部分（38,40）切换到对应的直流端子（32,34）和第三端子（42）之间的电路中， 经由每个主要肢体部分（38,40）选择性地在AC和DC电力网络（46,44）之间传输电力，控制单元（62）还控制每个模块中的每个次级开关元件的切换 （60），以控制第三端子（42）处的交流电压波形的配置。

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