WANG Juanjuan,WANG Haifeng,YU Zhenxiao,et al.Analysis of Commutation Voltage-Time Area and Firing Angle Correction Strategy for HVDC Under Harmonic Influence[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251212003.
WANG Juanjuan,WANG Haifeng,YU Zhenxiao,et al.Analysis of Commutation Voltage-Time Area and Firing Angle Correction Strategy for HVDC Under Harmonic Influence[J/OL].Automation of Electric Power Systems, http://dx.doi.org/10.7500/AEPS20251212003.DOI:
Analysis of Commutation Voltage-Time Area and Firing Angle Correction Strategy for HVDC Under Harmonic Influence
Harmonics cause distortion of commutation voltage waveforms
thereby reducing the commutation margin of the converter valves
which is an important inducement of commutation failure in high voltage direct current (HVDC) transmission systems. Existing commutation failure suppression methods considering the influence of harmonics mainly rely on the fast Fourier transform (FFT) for harmonic analysis. However
during the transient process caused by AC faults
the FFT suffers from limited calculation accuracy under non-stationary signals and inherent response delays
which affects the effectiveness of the suppression strategy. Based on the commutation voltage-time area theory
this paper quantitatively analyzes the impact of harmonics on the commutation margin area and proposes a firing angle correction strategy independent of real-time FFT calculation. In this strategy
the harmonic content boundary value that causes commutation failure is determined first. After quickly detecting an AC fault
the desired firing angle that meets the commutation margin requirement is calculated based on this boundary value. Further
the firing angle order output by the control system is corrected. Finally
the effectiveness of the proposed method is verified in the electromagnetic transient simulation platform PSCAD/EMTDC using the CIGRE HVDC benchmark test model and the Guizhou-Guangdong HVDC project model.
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Related Author
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Related Institution
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University)
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