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Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method

A technology of electromagnetic transient simulation and topology transformation, which is applied in the fields of instruments, electrical digital data processing, and special data processing applications, and can solve problems such as inability to simulate converters

Active Publication Date: 2013-05-22
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +3
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since in the switching cycle averaging model, each level is not simulated individually, abnormal conditions of the converter such as failure of a single submodule cannot be simulated

Method used

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  • Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method
  • Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method
  • Modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method

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Embodiment Construction

[0052] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053] This embodiment first establishes the Thevenin equivalent circuit of the submodule, and then obtains the Thevenin equivalent circuit of several series-connected submodules, opens PSCAD, utilizes Fortran script to edit the custom module, and replaces one or more series-connected submodules (can replace one series submodule of the bridge arm). In the custom module of PSCAD, state bits are used to represent IGBT states, arrays are used to represent variables such as capacitor voltage and sub-module current, and differential equations are used to calculate sub-module capacitor voltage and sub-module current. specific:

[0054] To build a custom module for an equivalent bridge arm, it is first necessary to establish the Thevenin equivalent model of a single submodule (SM), and then obtain the Thevenin equivalent model...

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Abstract

The invention discloses a modular multilevel converter (MMC) topology converter efficient electromagnetism transient state simulation method. The method comprises the following steps: (1) building a thevenin equivalent circuit of a submodule and acquiring the hevenin equivalent circuit of a series subnodule, (2) opening power system computer aided design (PSCAD) and operating Fortran script editing user-defined module, (3) replacing at least one submodule by using the user-defined module, (4) using status bit to show insulated gate bipolar transistor (IGBT) status in the user-defined module of the PSCAD, (5) and figuring submodule capacitor voltage and submodule current by using a difference equation. The method reduces the number of nodes of a MMC topology converter model, and is quick in simulation speed and high in efficiency.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a high-efficiency electromagnetic transient simulation method for an MMC topology converter. Background technique [0002] The proposal of modular multilevel (MMC) topology has promoted the development of flexible DC transmission technology. This topology uses module cascading to achieve high voltage, which avoids the need for hundreds of power electronic devices connected in series in the field of high-voltage DC transmission. The dynamic and static voltage equalization problem brought about reduces the requirements for the consistency of power devices. However, the number of semiconductor devices in the modular multi-level flexible DC converter valve is usually the second power of the number of two-level / three-level topological devices. The huge number of devices has brought great challenges to the electromagnetic transient simulation of the converter. challenge. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 杨兵建杨岳峰谢敏华王韧秋汤广福包海龙何维国
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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