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An IGBT control method based on MMC-HVDC

A control method and a technology of current direction, applied to output power conversion devices, electrical components, and conversion of AC power input to DC power output, etc., can solve the problems of being unsuitable for FPGA implementation, occupying a lot of resources, and having a large amount of computation

Inactive Publication Date: 2018-12-21
XIDIAN POWER RECTIFIER XIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method effectively reduces the switching frequency of sub-modules, but it has a large amount of calculation, takes up more resources, and is not suitable for FPGA implementation.

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  • An IGBT control method based on MMC-HVDC
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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] As used herein, "first", "second", ..., etc. do not refer to the meaning of sequence or order, nor are they used to limit the present invention. They are only used to distinguish elements or components described with the same technical terms. operate.

[0036] As used herein, "comprising", "comprising", "having", "comprising" and so on are all open terms, meaning including but not limited to.

[0037] As used herein, "and / or" includes any or all combin...

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Abstract

The invention provides an IGBT control method based on MMC-HVDC, comprising the following steps: according to the obtained current working state of each sub-module on the same bridge arm, dividing each sub-module into an input group and a cut-off group; sorting each sub-module of the input group and each sub-module of the cut-off group according to the magnitude of the sub-module voltage; making The difference between the expected input sub-module number and the input sub-module number in the input group to generate the input sub-module difference value; according to the current direction of the bridge arm where each sub-module is located, selecting the conditional relationship; generating an optimal exchange value according to the input sub-module difference and the conditional relation;and adjusting the submodule states of the input group and the submodule states of the cut-off group according to the optimal exchange value. The invention has the beneficial effects of regulating thevoltage fluctuation amplitude of the capacitance of the bridge arm sub-module (i.e., voltage equalization effect), optimizing the average switching frequency of the IGBT of the MMC valve group, prolonging the service life of the IGBT, reducing the loss of the MMC valve group and improving the engineering reliability.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to an IGBT control method based on MMC-HVDC. Background technique [0002] Modular multilevel converter based high voltage direct current transmission (MMC-HVDC, modular multilevel converter based HVDC) has become a research hotspot in the field of high voltage direct current (HVDC) transmission since it was proposed in 2003. MMC has the excellent characteristics of a voltage source converter, can realize four-quadrant operation, can independently control active and reactive power, and can operate in a passive inverter state. In addition, MMC adopts modular design and redundant control, which is not only convenient for expansion and maintenance, but also has the advantages of large number of output voltage levels, low harmonic content, low switching loss, and strong fault ride-through capability. Therefore, MMC-HVDC has become a high-voltage DC The development trend of...

Claims

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Application Information

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IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 苟锐锋常立国杨晓平田鸿昌洪俊王羽
Owner XIDIAN POWER RECTIFIER XIAN