Modeling method for dynamic model of modular multi-level convector

Abstract

The invention provides a modeling method for a dynamic model of a modular multi-level convector. The method comprises the following steps of establishing an upper bridge single submodule switch period average model and an upper bridge arm single submodule small signal communication model; establishing an upper bridge arm switch period average model and an upper bridge arm small signal communication model; establishing a lower bridge arm switch period average model and a lower bridge arm small signal communication model; establishing a lower bridge single submodule switch period average model and a lower bridge arm single submodule small signal communication model; and establishing a modular multi-level convector switch period average module and a modular multi-level convector small signal module. The established dynamic model of the modular multi-level convector facilitates analysis on a dynamic property and a frequency response characteristic of the modular multi-level converter, facilitates cascade control strategy design of the device, and achieves description of internal state quantity.

Description

technical field [0001] The invention belongs to the technical field of electric power system transmission, and in particular relates to a dynamic model modeling method of a modular multilevel converter. Background technique [0002] In 2002, R.Marquart and A.Lesnicar of the Bundeswehr University in Munich, Germany jointly proposed a new modular multilevel voltage source converter. In 2004, a 17-level 2MW prototype was successfully developed. In 2009, the B4.48 working group of the International Large Power Grid Conference officially named it a modular multilevel converter (MMC). This topology constitutes a converter valve through sub-modules connected in series. It has high modularity, small harmonic distortion, and low switching loss. It is suitable for high-voltage and high-power applications and has broad application prospects. It can be used for flexible DC transmission and unified power flow control. Various flexible DC power transmission and flexible AC power transmi...

AI Technical Summary

Problems solved by technology

The model built by the topology modeling method directly reflects the circuit topology, and the complexity increases significantly with the increase of the number of switching devices; the output modeling method usually equivalents the device to a controlled source or impedance form, and the built model is relatively simple, but ignores The status information of the internal components of the device is obtained, which is not conducive to the analysis of the characteristics of the device

Therefore, the application of both methods is limited

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