The mmc simulation model and method based on sub-module DC voltage control closed loop

Abstract

The invention relates to an MMC simulation model and method based on a sub-module DC voltage control closed-loop. The system includes: the AC side of each detailed model sub-module is equivalent to two controlled voltage sources, and the DC side of each detailed model sub-module is equivalent to a controlled current source, capacitance and resistance in parallel with each other, forming an equivalent Model sub-module; multiple equivalent model sub-modules constitute the MMC equivalent simulation model; use the ratio of the bridge arm modulation wave of the MMC equivalent simulation model to the DC voltage of the MMC equivalent simulation model to generate the bridge arm switching function; use the equivalent model The DC voltage of the sub-module and the switching function of the bridge arm form a closed loop; based on the switching function of the bridge arm and the closed loop, the equivalent model sub-module switching function is generated; the continuous equivalent model sub-module switching function is used to replace the on-off process of the equivalent model sub-module . The present invention can improve the simulation speed while retaining the electric quantity characteristics of the MMC detailed switch model.

Description

technical field [0001] The invention relates to the field of modular multi-level converter (Modular Multi-level Converter, MMC) simulation, in particular to an MMC simulation model and method based on sub-module DC voltage control closed-loop. Background technique [0002] With the rapid development of science and technology and social economy in various countries, countries around the world have paid more and more attention to new energy power generation, and have invested a lot of funds to support the research and development of new energy technology. and other characteristics, some new problems arise after they are connected to the AC and DC power grid. An effective way to connect distributed power sources to the AC / DC hybrid transmission and distribution network in an economical and flexible way through VSC has become a key issue in domestic and foreign research. The VSC-based converter station is one of the core technologies to realize the AC / DC power transmission and ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a MMC simulation model and method based on sub-module DC voltage control closed-loop, to solve the problem that the sub-module characteristics of MMC cannot be taken into account, and the simulation speed is low

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