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Detailed EMT model and full-scale interface HIL test of hybrid MMC

Because the numerous nonlinear components and fiber interfaces are used in Module Multiple Converter (MMC), the HIL test of MMC with detailed EMT model and the full-scale interface is hard to be implemented. In recent years, this existing disadvantage caused the MMC controller hardware and software difference between the HIL test and real project. In this paper, a detailed EMT model of hybrid MMC fitting for full-scale interface HIL test is proposed, and the equivalent arm circuit of hybrid MMC and the nonlinear feature of the sub-module are introduced. Then the full-scale interface HIL test system is built to test the performance of proposed model under various conditions. Comparing with the reference model built in MATLAB with detailed semiconductor model, the accuracy of the proposed method can meet the requirement of HIL tests, the current difference of two methods is less than 0.73% and the capacitor voltage difference is less than 0.39%. Due to the full-interface structure, the proposed method can simulate the divergence of capacitor voltage and all faults of the submodule. The MMC controller tested by the proposed method can be directly used in the real project without hardware and software modification.