An Equivalent Simulation Method Based on Full Bridge Submodule MMC Considering Multiple Blocking Modes

Abstract

The invention discloses an equivalent simulation method based on a full-bridge sub-module MMC considering multiple locking modes, comprising: obtaining the bridge arm current of the corresponding bridge arm and the switch signal of each full-bridge sub-module IGBT of the bridge arm; The equivalent circuit of the full-bridge sub-module is constructed according to the parameters; the corresponding simulation system is established according to the equivalent circuit of the full-bridge sub-module, and the simulation is carried out. The MMC equivalent simulation method of the present invention uses the internal mechanism of numerical calculation and electromagnetic simulation to equivalent the sub-modules to the Thevenin equivalent branch, avoiding frequent disconnection of a large number of power electronic devices, and greatly reducing the simulation calculation time; at the same time, it introduces real The diode device considers various blocking modes of the full-bridge sub-module, and can accurately simulate each blocking state of the full-bridge sub-module under the premise of ensuring the simulation speed.

Description

technical field [0001] The invention belongs to the technical field of power system simulation, and in particular relates to an equivalent simulation method based on a full-bridge sub-module MMC considering multiple blocking modes. Background technique [0002] In 2001, German scholar R. Marquardt first proposed the topology of modular multilevel converter (MMC). There are problems such as consistent triggering, so it has received extensive attention from academia and industry in recent years, and has been quickly applied to engineering practice. [0003] Such as figure 1 As shown, the bridge arm of the MMC topology is composed of multiple sub-modules connected in series. The structure of the sub-modules can be divided into different types according to the needs of the application. At present, half-bridge sub-modules, full-bridge sub-modules and clamped twin sub-modules are commonly used. Three types of modules. Among them, the full-bridge sub-module has more application ...

AI Technical Summary

Problems solved by technology

This algorithm greatly reduces the dimension of the MMC admittance matrix and speeds up the simulation, but it cannot accurately process the interpolation of the diode, resulting in a large deviation between the system simulation characteristics and the real characteristics when the sub-module is blocked.

In addition, the existing research generally only focuses on the half-bridge sub-module, and there are few studies on the full-bridge sub-module

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