科研之友
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摘要
There are a large number of semiconductor switching devices in the modular multilevel converter with embedded super capacitor energy storage system（MMC-SCES），and the simulation scale of MMC-SCES pose a huge challenge to the efficiency of electromagnetic transient simulation. To overcome this issue，it is proposed an efficient MMC-SCES electromagnetic transient simulation method by constructing the Thevenin equivalent circuit of the bridge arm. This method significantly reduces simulation time and maintains simulation accuracy while preserving all dynamic variables of the converter. A dual-ending MMC-SCES simulation system is built in PSCAD／EMTDC to validate the proposed efficient simulation method. The results show that compared with the simulation methods based on the average value model，the proposed efficient simulation method has higher accuracy and can fit the dynamic variables inside the submodules，compared with the simulation methods based on detailed switching model，the proposed efficient simulation method can increase the simulation speed by about 518 times，while the normalized integral of absolute error is controlled within 1%. ? 2024 Electric Power Automation Equipment Press.
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