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Soft start simulation method for modular multi-level converter

A modular multi-level, process simulation technology, applied in the fields of instruments, electrical digital data processing, special data processing applications, etc., can solve the problem of too long soft start simulation time, and achieve the effect of shortening simulation time and improving efficiency

Active Publication Date: 2014-09-24
XJ ELECTRIC
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a simulation method for the soft start process of a modular multilevel converter to solve the problem that the soft start simulation time of the existing modular multilevel converter is too long

Method used

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  • Soft start simulation method for modular multi-level converter
  • Soft start simulation method for modular multi-level converter
  • Soft start simulation method for modular multi-level converter

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Embodiment Construction

[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] 1. Establish the equivalent circuit of the modular multilevel converter, and replace the bridge arm of the MMC converter valve of the multilevel circulator with the equivalent module of the bridge arm.

[0024] The detailed model of the multilevel converter used in the present invention is as figure 1 As shown, it includes a three-phase power grid, a connecting transformer, three soft-starting resistor modules, six buffer reactors and six bridge arms, and each bridge arm is connected in series with its corresponding buffer reactor. Between them is the AC output terminal of the converter, and the AC output terminal of the converter is connected to the three-phase grid through the soft-start resistance of the parallel bypass switch, the AC system switch and the connection transformer in turn. The equivalent circuit model of multilevel ...

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Abstract

The invention relates to a soft start simulation method for a modular multi-level converter and belongs to the technical field of flexible power transmission and distribution of power systems and power electronics. An equivalent circuit of a modular multi-level converter is established at first, bridge arm equivalent modules replace MMC converter valve bridge arms of the multi-level converter, each bridge arm is equivalent to an equivalent module formed by connecting two serially connected diodes, a capacitor, a bleeder resistor and a controlled current source in parallel, the parameters of all elements in the bridge arm equivalent modules are set to enable the equivalent circuit model to have the same external properties as a detailed model, and the soft start process of the equivalent circuit of the configured modular multi-level converter is simulated. As the equivalent circuit is adopted to simulate the soft start process of the converter, the time required for simulating the soft start process of the converter is greatly shortened and the engineering design efficiency of the soft start resistor is improved.

Description

technical field [0001] The invention relates to a method for simulating the soft start process of a modularized multilevel converter, belonging to the technical fields of flexible power transmission and distribution of power systems and power electronics. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronic technology in power systems, the technology of flexible direct current transmission (VSC-HVDC) based on voltage source converters has been paid more and more attention. Modular Multilevel Converter (Modular Multilevel Converter) is a kind of voltage source converter used in VSC-HVDC system. It is composed of multiple half-bridge or full-bridge sub-modules connected in a certain way. By separately controlling the input and disconnection states of the IGBT components of each sub-module, the AC voltage output by the converter is close to a sine wave, thereby realizing efficient energy transmis...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCY02E60/00
Inventor 姚为正吴金龙张浩韩坤刘普甄帅
Owner XJ ELECTRIC
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