| Aiming at the problems of slow simulation,limited versatility and low simulation accuracy of the MMC electromagnetic transient simulation model in the high-level MMC system simulation,it is hoped that after relevant research,it is proposed to be a suitable efficient modeling method for large-scale MMC,which can improve the electromagnetic transient simulation speed of MMC,expand the scale of the electromagnetic transient simulation software,and realize the more accurate modeling of the MMC lock and faults to improve MMC simulation accuracy;further build a suitable electromagnetic transient efficient simulation model for VSC-HVDC asynchronous networking,verify the efficient modeling method,the main contents of this paper include:(1)For the purpose of investing the electromagnetic transient efficient modeling method to achieve the Faster simulation speed,The working principle of MMC is analyzed.and simplify the system modeling process and Optimize the control algorithm of MMC.(2)Taking the half-bridge MMC as an example,Research on Simulation Modeling of MMC faults,the high-speed model and the detailed model are simulated and compared by setting different faults,and summarize the applicable range of high-speed model in simulating MMC faults and the correlation with short-circuit resistance,which will be a great significance for simulation research.(3)The model is applied to verify the rapidity of the east-west asynchronous interconnection project simulation of Guangdong Power Grid.At the same time,the accuracy and rapidity of the improved speed model are verified by the PSACD model simulation of Luoping back-to-back asynchronous networking interconnection project. |
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