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Pre-charging method for full-bridge type MMC

A pre-charging, bridge-type technology, applied in current collectors, electric vehicles, electrical components, etc., can solve the problems that full-bridge type MMC cannot be directly applied, and achieve the effect of saving charging time and simple control method

Active Publication Date: 2018-11-02
CHINA XD ELECTRIC CO LTD +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the difference in the sub-module structure, the current pre-charging method of the half-bridge MMC cannot be directly applied to the full-bridge MMC, so it is very necessary to study the pre-charging method of the full-bridge MMC and give a feasible pre-charging method

Method used

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  • Pre-charging method for full-bridge type MMC
  • Pre-charging method for full-bridge type MMC
  • Pre-charging method for full-bridge type MMC

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] refer to figure 1 , the full-bridge MMC has 6 bridge arms in total, and each bridge arm is provided with an inductor L 0 and N submodules SM connected in series, the inductance L 0 It is connected in series with the sub-module SM, and the phase unit is composed of upper and lower bridge arms of each phase.

[0035] refer to figure 2 , the sub-module SM is a full-bridge sub-module. The full-bridge sub-module FBSM includes an IGBT full-bridge and a DC energy storage capacitor C. By controlling the on-off of T1, T2, T3, and T4, the sub-module can be put into, There are three states of cutting and blocking, so as to realize the input and cutting of sub-modules.

[0036] refer to image 3 , a full-bridge MMC pre-charging method includes an uncontrolled charging stage and a controlled charging stage. In the uncontrolled charging stage,...

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Abstract

The invention discloses a pre-charging method for a full-bridge type MMC. The pre-charging method is divided into an uncontrolled charging phase and a controllable charging phase. In the uncontrolledcharging phase, all sub-modules are in a locked state, and the phenomenon that no overcurrent occurs in the charging process can be ensured through a series current limiting resistor; and in the controllable charging phase, a full-bridge sub-module trigger system is used to charge and withdraw the sub-modules of each bridge arm in a grouping mode, so that capacitors of the sub-modules are chargedto the rated voltage to complete a pre-charging process. According to the scheme of the invention, the phenomenon that the full-bridge type MMC takes power from an alternating current system in the pre-charging phase can be ensured, and meanwhile, a direct current line can be prevented from bearing a huge voltage change ratio, and the voltage of each sub-module can be raised to a rated voltage value of the sub-modules after the pre-charging process is completed.

Description

technical field [0001] The invention belongs to the technical field of electric power transmission and distribution, and in particular relates to a precharging method of a full-bridge MMC. Background technique [0002] In recent years, the modular multilevel converter (MMC) has become a research hotspot in the field of voltage source converter-based high-voltage direct current transmission (VSC-HVDC). Compared with two-level and three-level VSC-HVDC, MMC has the advantages of low harmonic content, can be applied to high-voltage and large-capacity occasions, and does not require parallel capacitors on the DC side. [0003] At present, many MMC-HVDC projects at home and abroad have been completed and put into operation, and many projects are under construction planning. Among them, the planned MMC converter station has a transmission capacity of 5000MW and a DC voltage of ±800KV. [0004] The MMC-HVDC projects that have been completed so far are all half-bridge MMC (HB-MMC),...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J7/10H02J7/34
CPCH02J2007/10H02J3/36H02J7/06H02J7/345Y02E60/60
Inventor 苟锐锋杨晓平李少华苏匀马小婷殷艳娇杨超刘佳
Owner CHINA XD ELECTRIC CO LTD
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