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Impacts of Digital Filters on Admittance Dissipativity of Sequence Current Control for VSCs

This paper analyzes the impacts of digital filters on the admittance dissipativity of dual-sequence current control for grid-connected voltage-source converters (VSCs). The output admittance model of VSC is first derived in the aβ-frame with complex vectors, and then the frequency-domain dissipativity theory is employed to analyze the dynamic impacts of digital filters, revealing that the cascaded use of sequence-decomposition filter (SDF) and low-pass filter (LPF) in the voltage-feedforward (VFF) tends to induce a nondissipative region. Then, an analytical design method for the LPF is developed for mitigating the non-dissipative region. Lastly, the simulation and experiment results verify the accuracy of the theoretical analysis.