Multi-blocking mode-considering full-bridge sub-module MMC-based equivalent simulation method

Abstract

The invention discloses a multi-blocking mode-considering full-bridge sub-module MMC-based equivalent simulation method. The method comprises the following steps: obtaining a bridge arm current corresponding to a bridge arm and switching signals of full-bridge sub-modules IGBT of the bridge arm; constructing equivalent circuits of the full-bridge sub-modules according to running parameters; and establishing corresponding simulation systems according to the equivalent circuits of the full-bridge sub-modules and carrying out simulation. According to the MMC equivalent simulation method, the sub-modules are equivalent to Thevenin equivalent branches by utilizing numerical calculation and internal mechanism of electromagnetic simulation, so that the frequent on-off of mass of power electronic devices is avoided and the simulative calculation time is greatly shortened; and meanwhile, real diode devices are introduced to consider diversified blocking manners of the full-bridge sub-modules, so that the blocking states of the full-bridge sub-modules can be accurately simulated 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 modular multilevel converter (MMC) topology. The bridge arms of this topology adopt the form of cascading basic operating units to avoid direct series connection of a large number of switching devices. There is no Issues such as consistent triggering have received extensive attention from academia and industry in recent years, and have been rapidly 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-brid...

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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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