Real-time online simulation system for MMC (Modular Multilevel Converter) type high-voltage frequency converter based on RT-Lab and WiGig

Abstract

The invention discloses a real-time online simulation system for an MMC (Modular Multilevel Converter) type high-voltage frequency converter based on RT-Lab and WiGig. The system comprises an upper computer, a target machine, a controller, the MMC type high-voltage frequency converter and a WiGig wireless communication module. G.hn standard is adopted in the communication specification of the WiGig wireless communication module. A signal output by a control unit of the MMC type high-voltage frequency converter is acquired through an RT-LAB simulator, so that capacitor voltage balance control and modulation of converters on the rectification side and the inversion side of the MMC type high-voltage frequency converter are realized, real-time wireless signal interaction between control unit real equipment of the MMC type high-voltage frequency converter is simulated in real time, and simulation control of the MMC type high-voltage frequency converter is realized. By adopting the real-time online simulation system, the data transmission rate among different components in the system is effectively increased, a large amount of technical reference data is provided for the real-time control of the MMC type high-voltage frequency converter, and the research and development period and cost of the MMC type high-voltage frequency converter can be greatly shortened and reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics and electric transmission, and in particular relates to a real-time on-line simulation system of an MMC type high-voltage frequency converter based on RT-Lab and WiGig. Background technique [0002] In recent years, the modular multilevel converter (Modular Multilevel Converter, MMC) has received more and more attention. It inherits the modular advantages of the H-bridge cascaded structure, and realizes multilevel by cascading power units. output. Each power unit is composed of a two-level bridge arm, and all capacitors are suspended. Due to the existence of a common DC bus, a single DC voltage can be used without the need for a multi-winding transformer. Each bridge arm sub-module of MMC can be selectively controlled, so that it can be equivalent to a controllable voltage source. The sum of the voltages of the two bridge arms in each phase of MMC is equal to the DC bus voltage. By cont...

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Problems solved by technology

[0003] At present, pure digital simulation software such as MATLAB / SIMULINK, PSCAD / EMTDC and PSIM are mostly used for research on high-voltage inverters, which have shortcomings such as not being able to simulate the operation of inverters, and being inconvenient for real-time development and transplantation of control algorithms.

Literature "Zheng Zheng, Cui Can, Zhang Peng. New high-voltage inverter topology and its control based on modular multilevel converters [J]. Coal Journal, 2014, 39(10): 2128-2133" based on Matlab- Simulink and RT-Lab hardware-in-the-loop simulation equipment have built an experimental platform and host computer controller, but this document does not involve WiGig wireless communication technology, and the interactive simulation between PSCAD / EMTDC and MATLAB / SIMULINK is not considered in the host computer model construction

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