A bridge arm equivalent simulation method for mmc

A simulation method and bridge arm technology, applied in the field of effect simulation, can solve problems such as inability to process diode interpolation

Active Publication Date: 2015-12-02
ZHEJIANG UNIV +1
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Problems solved by technology

[0005] The above-mentioned simplified algorithm greatly improves the efficiency of steady-state simulation analysis and partial transient simulation analysis, but there is still a big limitation for the simulation of the system in the sub-module locked state, that is, they cannot calculate the diode in the simulation calculation. Interpolation for precise processing

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  • A bridge arm equivalent simulation method for mmc
  • A bridge arm equivalent simulation method for mmc
  • A bridge arm equivalent simulation method for mmc

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Embodiment Construction

[0057] In order to describe the present invention more specifically, the simulation method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0058] like image 3 As shown, a bridge arm equivalent simulation method of MMC includes the following steps:

[0059] In this embodiment, the MMC is a three-phase half-bridge modular multilevel converter, such as figure 1 As shown, it is a three-phase six-leg structure, each phase has two bridge arms, and each bridge arm is formed by cascading N sub-modules SM and connected to the corresponding phase port through a reactor. The sub-module SM consists of two insulated gate bipolar transistors IGBT 1 ~IGBT 2 , two diodes D 1 ~D 2 , a thyristor T h and a capacitor C 0 Composition; Among them, the thyristor T h The cathode and IGBT 1 source, diode D 1 anode, IGBT 2 drain and diode D 2 The cathode is connected and used as one end of the s...

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Abstract

The invention discloses an MMC (Modular Multilevel Converter) bridge arm equivalent simulation method which is mainly used for solving the defect of a simulation technique during the shutting of an MMC. The method comprises the following steps of 1, obtaining bridge arm operating parameters of the MMC, wherein the bridge arm operating parameters comprise bridge arm current and switch signals S1-S3 of each submodule in a bridge arm; 2, constructing a bridge arm equivalent circuit according to the bridge arm operating parameters, wherein the bridge arm equivalent circuit comprises two equivalent voltage sources, two equivalent resistors, two equivalent diodes and an equivalent thyristor; 3, building an MMC simulation system according to the bridge arm equivalent circuit, and performing simulation on the system. According to the MMC bridge arm equivalent simulation method, the complicated bridge arm circuit in the MMC is effectively equivalent to a simple circuit, the node amount and the corresponding simulation operand of the system are greatly reduced, the simulation speed of the MMC is greatly promoted, and very high simulation precision is realized during the normal operation and the shutting of the MMC.

Description

technical field [0001] The invention belongs to the technical field of electric power system simulation, and in particular relates to an equivalent simulation method of an MMC bridge arm. Background technique [0002] With the vigorous development of power electronic devices dominated by insulated gate bipolar transistors (Insulated Gate Bipolar Transistor, IGBT), voltage source converters (Voltage Source Converter, VSC) have been widely used in the field of new energy grid connection and high voltage direct current transmission. . Among them, the MMC (ModularMultilevelConverter, modular multilevel converter) based on the modular multilevel converter has become the most promising VSC topology due to its small switching loss and low stress requirements on power electronic devices. . [0003] Among the topological structures of many MMCs, the three-phase half-bridge modular multilevel converter has received extensive attention because of its strong scalability, low switching...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/521
Inventor 徐政唐庚刘昇张哲任吴琛李玲芳张丹张杰
Owner ZHEJIANG UNIV
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