MMC real-time simulation modeling method and system

Abstract

The invention discloses an MMC real-time simulation modeling method and system. The system is composed of a circuit partitioning model and a half-bridge submodule electromagnetic transient numerical model. An ideal transformer model method is adopted for conducting circuit model partitioning on an MMC. The circuit partitioning model comprises a main circuit and a half-bridge MMC submodule group of all bridge arms. The main circuit and all the bridge arms are equivalent to a series circuit of a switch and a controlled voltage source, and the voltage signal value of the series circuit is the sum of output voltages of the submodule group of the bridge arms. Mononuclear serial or multinuclear parallel electromagnetic transient real-time simulation of the MMC can be realized; compared with an original overall model, extremely high simulation precision is achieved, the real-time simulation scale of the MMC can be expanded within a certain step length range, meanwhile, good stability is achieved, and the equivalent MMC submodule transient numerical model still has a locking function.

Description

technical field [0001] The invention relates to an MMC real-time simulation modeling method and system, belonging to the field of modeling and simulation of power systems. Background technique [0002] Compared with traditional two / three-level converters, modular multilevel converters (MMCs) have the advantages of low switching frequency, low device loss, and high waveform quality. There are more and more large-capacity application scenarios. In the development research involving MMC main circuit and control system, hardware in loop (Hardware in Loop, HIL) test can be used to verify the rationality of the MMC main circuit, the effectiveness of the control strategy, etc., HIL is considered to be an efficient research and development means . However, all HIL-based research must be premised on proper real-time simulation modeling. The characteristics and difficulties of real-time simulation modeling are reflected in the adaptability of the model to speed, that is, within a si...

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Problems solved by technology

[0004] In order to solve the above-mentioned real-time simulation problem of MMC, the efficient simulation models of MMC in the literature so far mainly include the circuit model segmentation method and the Thevenin time-domain equivalent method, etc. However, these methods have not solved the possible problem of unit delay in the equivalent model Distortion of simulation results or numerical instability

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