MMC (modular multilevel converter) equivalent modeling method with module latching function

A technology of equivalent modeling and sub-modules, which is applied in the field of effective modeling, can solve the problems of not involving sub-module blocking functions and increasing the burden of simulation

Active Publication Date: 2014-02-26
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the electromagnetic transient simulation process of the MMC converter, it is necessary to simulate a large number of power electronics, which increases the simulation burden. When the number of cascades is high, it is necessary to use the equivalent model calculation
At present, there are many MMC equivalent modeling, but none of them involve the sub-module blocking function, and can only be equivalent to the normal operating state of the MMC converter.

Method used

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  • MMC (modular multilevel converter) equivalent modeling method with module latching function
  • MMC (modular multilevel converter) equivalent modeling method with module latching function
  • MMC (modular multilevel converter) equivalent modeling method with module latching function

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Embodiment Construction

[0043] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] The invention provides an MMC equivalent modeling method with a sub-module blocking function, the MMC is a three-phase six bridge arm structure, and each bridge arm is composed of sub-module cascades; the sub-modules include parallel IGBT series branches and capacitor branch; the IGBT series branch is composed of two series connected IGBT modules; the MMC sub-module circuit diagram is as follows figure 1 shown.

[0045] The equivalent circuit of the sub-module is as figure 2 As shown, including: the IGBT series branch of the sub-module is equivalent to a resistor series branch; the capacitor branch is equivalent to a resistor and a power supply series branch;

[0046] The IGBT module includes IGBT module I and IGBT module II. IGBT module I and IGBT module II are composed of IGBT devices and diodes connected in ...

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Abstract

The invention relates to modeling methods of MMC (modular multilevel converter) submodules, in particular to an MMC equivalent modeling method with a module latching function. The method is characterized in that an IGBT (insulated gate bipolar transistor) series branch of a submodule is enabled to be equivalent to a resistor series branch, and a capacitor branch is enabled to be equivalent to a resistor and power source series branch. The method includes the following steps: 1, determining equivalent voltage Vsm and equivalent resistance RsmEQ of a module equivalent circuit; 2, determining equivalent circuit parameters. By the method, electromagnetic transient simulation can be performed on a modularized multilevel converter accurately and quickly, and the submodule latching function is provided, so that simulation efficiency is greatly improved and time for simulation is reduced.

Description

technical field [0001] The invention relates to a modeling method of an MMC converter sub-module, in particular to an MMC equivalent modeling method with a sub-module blocking function. Background technique [0002] With the prominence of environmental problems and the aggravation of the energy crisis, wind energy, solar energy and other renewable energy power generation has been developed by leaps and bounds. As an effective means of grid-connected clean energy, light DC transmission technology has attracted more and more attention. The flexible DC transmission technology based on two-level or three-level conversion technology has high harmonic content in the AC side voltage, which requires a bulky AC filter, which increases the cost and land occupation of the converter station. On the other hand, with the increase of the voltage level, device voltage equalization and device loss also make the two-level or three-level flexible DC transmission technology face major challeng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 周杨
Owner STATE GRID CORP OF CHINA
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