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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

Active Publication Date: 2013-04-17
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology

Installing a large resistor on the DC side can equalize the positive and negative voltages, but this method has the disadvantages of large power loss and continuous power, which leads to problems such as heat dissipation and operational reliability of the large resistor grounded on the DC side. The latter needs to be independent It is difficult to design a new type of reactor

Method used

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  • Grounding device of modular multi-level voltage source converter based high voltage direct current (VSC-HVDC) system and a design method of grounding device
  • Grounding device of modular multi-level voltage source converter based high voltage direct current (VSC-HVDC) system and a design method of grounding device
  • Grounding device of modular multi-level voltage source converter based high voltage direct current (VSC-HVDC) system and a design method of grounding device

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Embodiment Construction

[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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Abstract

The invention relates to the field of voltage source converter based high voltage direct current (VSC-HVDC), in particular to a grounding device of a modular multi-level VSC-HVDC system and a design method of the grounding device. The grounding device is arranged at the alternating current (AC) side of a modular multi-level VSC-HVDC, is used for AC / DC component working conditions in the VSC-HVDC system and is used for meeting positive and negative voltage sharing of the DC side of the VSC-HVDC system or providing a zero-sequence current path. The grounding device comprises a grounding transformer and a grounding resistor which are connected with each other and a Z-type transformer or a star-delta transformer is adopted to serve as the grounding transformer. The design method comprises the following steps: A, determining excitation reactance parameters of the grounding transformer; B, determining parameters of the grounding resistor. The grounding device is low in loss, and meanwhile, improvements are performed on the traditional technological base of the grounding device, so that the required development is low in difficulty and is reliable, simple and convenient. The grounding device has the advantages that the occupied area is small, the manufacturing cost is low, and the operational stability is high.

Description

technical field [0001] The invention relates to the field of flexible direct current transmission (VSC-HVDC), in particular to a grounding device and a design method of a modular multilevel flexible direct current transmission system. Background technique [0002] Flexible DC transmission technology has been widely used in various fields because of its flexibility in power transmission control. The flexible DC transmission technology based on modular multilevel converters is a new type of flexible DC transmission technology, which has attracted more and more attention, and has broad application prospects in the application fields related to flexible DC. [0003] Due to the adoption of modular multilevel technology in the flexible DC transmission system based on modular multilevel converters, the harmonic component of the AC system at the outlet of the converter valve is very small, so there is no need to install an AC filter on the AC side of the converter valve. The system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
Inventor 王海田季兰兰马巍巍李泓志杨杰
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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