Improved modularized multi-level current converter equivalent method

A modular multi-level, converter technology, applied in the efficiency field

Active Publication Date: 2018-11-30
NORTHEAST DIANLI UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing equivalent methods and provide a scientific and reasonable method that comprehensively considers the blocking and non-blocking cond

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  • Improved modularized multi-level current converter equivalent method
  • Improved modularized multi-level current converter equivalent method
  • Improved modularized multi-level current converter equivalent method

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Embodiment Construction

[0092] The equivalent method of the improved modular multilevel converter of the present invention will be clearly and completely described below with reference to the accompanying drawings and examples.

[0093] The present invention is based on a half-bridge sub-module modular multilevel converter (ModularMultilevelConverter, MMC), its general topology is as follows figure 1 As shown, it is composed of three-phase six bridge arms, and each bridge arm is composed of N half-bridge sub-modules (Half-Bridge Sub-Module, HBSM) and reactors in series. The topology of the half-bridge sub-module is as follows: figure 2 Shown, including a capacitor, two reverse diodes and two insulated gate bipolar thyristor (Insulated-gateBipolarTransistor, IGBT or IGT).

[0094] S1: Determine the working state of the modular multilevel converter according to the working state of the half-bridge sub-module;

[0095] Step S1 defines the working state of the half-bridge sub-module, and determines the...

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Abstract

The invention discloses an improved modularized multi-level current converter equivalent method. Through distinguishing a semi-bridge sub-module working state in system normal operating and starting or failure, Thevenin equivalent is performed on a bridge arm while a system is positioned in a normal operating stage and a starting stage or the failure happens, and a locking condition and an non-locking condition are comprehensively considered, the improved modularized multi-level current converter equivalent method which is different from a bridge arm equivalent method only considering the system normal operating state is provided. While a semi-bridge sub-module is locked, a direction of a bridge arm current is frequently changed, and a diode is faced with a numerical interpolation problem,so the bridge arm current is caused to generate a distortion point. The method is capable of, while the semi-bridge sub-module is locked, modeling by using a built-in diode in PSCAD simulation software, enabling the numerical interpolation problem of the diode to be effectively solved, improving simulation precision, and apparent in acceleration effect. The method has the advantages of scientificrationality, simple calculation, convenient and easy operation, strong applicability, high simulation precision, and good acceleration effect.

Description

technical field [0001] The invention relates to the technical field of modularized multilevel converters, and relates to an equivalent method for an improved modularized multilevel converter. Background technique [0002] With the development of ModularMultilevelConverterbasedHighVoltageDirectCurrent (MMC-HVDC) projects to higher voltage levels and greater transmission power, the number of half-bridge sub-modules required is also increasing. In large-scale MMC -When simulating the HVDC system, it is necessary to invert a large number of ultra-high-order matrices, which makes the solution process very slow and takes a lot of time, which is not conducive to the application in actual engineering, so it is necessary to equivalent the detailed model. [0003] The existing equivalent methods are all based on the MMC steady state, without considering the blocking of the half-bridge sub-module. In the electromagnetic transient simulation, when the modular multilevel converter is in ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 金恩淑杨筱凡于新张亚菇崔勇包海龙郭强
Owner NORTHEAST DIANLI UNIVERSITY
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