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Constant-voltage sorting charging method of hybrid MMC and starting method and device

A voltage-equalizing charging and hybrid technology, applied in circuit devices, battery circuit devices, electric vehicles, etc., can solve problems such as judging the wrong direction of current and current impact

Inactive Publication Date: 2017-05-31
XUJI GRP +4
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a hybrid MMC sorting and equalizing charging method, starting method and device, which are used to solve the problem caused by wrong judgment of the current direction when the half-bridge and full-bridge hybrid modular multilevel converters are charging and starting. The problem of large current impact

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Embodiment Construction

[0040] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] Hybrid MMC starting method embodiment of the present invention:

[0042] Such as figure 1 Shown is a schematic diagram of the topology structure of the hybrid MMC applicable to the present invention, each bridge arm includes n half-bridge sub-modules HBSM and (N-n) full-bridge sub-modules FBSM. The startup flow chart is as follows Figure 6 shown.

[0043] specific:

[0044] 1) With a soft starting resistor, it performs uncontrolled rectification and charging. At this time, all the half-bridge and full-bridge sub-modules are in the locked state, that is, all the IGBTs are in the off state.

[0045] In this process, for the half-bridge sub-module, when the current is positive, the current path is as follows Figure 2-a As shown, the capacitor is charged; when the current is negative, the current path is as follows Figu...

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Abstract

The invention provides a constant-voltage sorting charging method of a hybrid MMC and a starting method and device. The constant-voltage sorting charging method comprises the steps of sorting full-bridge sub-modules and half-bridge sub-modules; cutting off a plurality of sub-modules with relatively high voltage for active constant-voltage charging until the voltage of the sub-modules is close to a rated value; unlocking a converter; and when the full-bridge sub-modules receive a lock instruction for charging, conducting any full-controlled device and turning off other three full-controlled devices. The charging starting process of the hybrid MMC employing the sub-modules can be completed without judging the current direction, so that the problem of voltage fluctuation of sub-modules at the end of the charging stage due to the fact that a half-bridge topology and a full-bridge topology are not consistent is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission, and in particular relates to a hybrid MMC sorting and equalizing charging method, starting method and device. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronic technology in power systems, the flexible DC transmission technology based on voltage source converters has been paid more and more attention. Modular multilevel converter (MMC) is a kind of voltage source converter in the application of flexible DC transmission system. It is composed of multiple sub-modules connected in a certain way. By controlling each sub-module IGBT group The input and cut-off states make the AC voltage output by the converter close to a sine wave, realizing efficient energy transmission. [0003] In traditional modular multilevel converters, usually figure 1 The half-bridge sub-module shown serves as the base u...

Claims

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Application Information

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IPC IPC(8): H02J7/34H02M1/36
CPCH02J7/34H02M1/36
Inventor 李道洋吴金龙王先为刘欣和张浩行登江孙树敏李广磊
Owner XUJI GRP
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