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An overvoltage control and protection method suitable for mmc flexible DC sub-modules

A control and protection, flexible DC technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as IGBT and capacitor explosion, and achieve the effect of avoiding system failures

Active Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the limitations of the current manufacturing process, when a serious overvoltage fault occurs in the sub-module of the large-capacity flexible direct current transmission system, the voltage on both ends of the capacitor and the IGBT is very close to the limit value of the device, which may cause the explosion of the IGBT and the capacitor in severe cases.

Method used

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  • An overvoltage control and protection method suitable for mmc flexible DC sub-modules
  • An overvoltage control and protection method suitable for mmc flexible DC sub-modules

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 , the present invention provides an overvoltage control and protection method suitable for MMC flexible DC sub-modules, the method comprising the following steps:

[0030] Step 1: Determine the three-level overvoltage control protection setting;

[0031] Step 2: Dynamically adjust the overvoltage control and protection setting of the second-level sub-module controller;

[0032] Step 3: Perform overvoltage control and protection on the MMC flexible DC sub-module.

[0033] Such as figure 2 , the three-level overvoltage control and protection settings in step 1 include the first-level valve base controller over-voltage control and protection settings, the second-level sub-module controller over-voltage control and protection settings, and the third-level breakdown diode Overvoltage control protection setting.

[0034] The first stag...

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Abstract

The invention provides an overvoltage control protection method suitable for an MMC flexible direct current submodule. The overvoltage control protection method suitable for the MMC flexible direct current submodule comprises the steps that a three-stage overvoltage control protection definite value is determined, the overvoltage control protection definite value of a second-stage submodule controller is dynamically adjusted, and overvoltage control protection is carried out on the MMC flexible direct current submodule. The overvoltage control protection method suitable for the MMC flexible direct current submodule is suitable for a high-capacity modularized multi-level flexible direct current transmission system to carry out overvoltage control protection on the submodule, realizes three-stage protection of overvoltage faults of the submodule through protection of a valve base controller, a submodule controller and a breakdown diode, and guarantees normal operation of an overvoltage fault submodule safety bypass and the entire modularized multi-level flexible direct current transmission system.

Description

technical field [0001] The invention relates to a protection method, in particular to an overvoltage control and protection method suitable for MMC flexible DC sub-modules. Background technique [0002] The modular multi-level flexible DC transmission system is mainly composed of multiple sub-modules connected in series and parallel. Each sub-module is composed of capacitors, rapid vacuum switches, IGBTs, SCRs, energy harvesting power supplies, etc.; each sub-module controller communicates with the upper-level valve base controller through optical fiber, and uploads the The state of the module is controlled by the valve base controller and the sub-module controller to complete the control of the sub-module. [0003] Due to the limitations of the current manufacturing process, when a serious overvoltage fault occurs in the sub-module of the large-capacity flexible direct current transmission system, the voltage on both ends of the capacitor and the IGBT is very close to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12
Inventor 汤广福客金坤李强冯静波邓卫华吕铮
Owner STATE GRID CORP OF CHINA