XU Feng,LU Yi,HUANG Xiaoming,et al.Zero-sequence Suppression Strategy of Flexible Multi-state Switch Based on Transformerless Voltage Source Converter[J].Automation of Electric Power Systems,2023,47(14):124-129.
XU Feng,LU Yi,HUANG Xiaoming,et al.Zero-sequence Suppression Strategy of Flexible Multi-state Switch Based on Transformerless Voltage Source Converter[J].Automation of Electric Power Systems,2023,47(14):124-129. DOI: 10.7500/AEPS20220720004.
Zero-sequence Suppression Strategy of Flexible Multi-state Switch Based on Transformerless Voltage Source Converter
The transformerless flexible multi-state switch (FMS) has the characteristics of compactness and high efficiency. But due to the lack of an isolation transformer
it has problems such as the interactive transmission and superposition of zero-sequence components between different supply areas after a fault. Based on the circuit characteristic analysis of the transformerless two-level voltage source converter (VSC)
this paper establishes the positive-sequence
negative-sequence and zero-sequence systems by using the symmetrical component method
which reveals the reasons and key elements of the transmission of zero-sequence components between AC and DC systems. Based on the theoretical analysis results
two zero-sequence suppression strategies of VSC at the fault and non-fault ends are proposed from the two aspects of DC fluctuation suppression and AC zero-sequence suppression. Finally
a two-terminal back-to-back FMS simulation model is established in PSCAD/EMTDC. The simulation results verify the correctness of the theoretical analysis and the effectiveness of the two zero-sequence suppression strategies.
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