Grounding device of modular multi-level voltage source converter based high voltage direct current (VSC-HVDC) system and a design method of grounding device
A modular multi-level, flexible DC power transmission technology, applied in the direction of DC network circuit devices, circuit devices, electrical components, etc., can solve the problems of large power loss, difficult development, continuous power, etc., and achieve low grounding resistance loss , Low requirements for long-term operation parameters, and the effect of reducing system power loss
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[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0043] The grounding device of the modular multi-level flexible direct current transmission system provided by the present invention is as follows: figure 1 As shown in , the grounding device is installed on the AC side of the modular multi-level flexible DC transmission system to meet the positive and negative voltage equalization of the DC side of the modular multi-level flexible DC transmission system or to provide a zero-sequence current path. The grounding device includes mutual Connected grounding transformer and grounding resistor; the grounding transformer adopts Z-type grounding transformer or star-delta grounding transformer.
[0044] The reference zero potential is one of the key factors affecting the control performance of the flexible direct current transmission system. The invention designs a grounding devi...
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