高压直流输电系统换相失败影响因素研究综述
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摘要
熄弧角小于阀固有极限熄弧角是换相失败的根本原因,但由于逆变侧交流系统运行环境的复杂性、直流运行控制方式的多样性、阀控制保护调节换相裕度的时延性,导致换相失败的判断依据面临准确性和适用性的问题。文中从单一直流、多回直流以及复杂系统3方面对换相失败的影响因素进行了详细梳理和分析,对于换相失败工程化电压判据指标提出建议,并指出考虑多因素的换相失败预测判据及控制措施、多馈入直流系统特性的量化评估以及适应实际系统的负荷模型等是今后研究的重要问题,为交直流混联系统的研究提供了参考意见。
The fundamental cause of commutation failure is that the extinction angle is less than the inherent critical extinction angle of valve. However, the complex operating conditions of AC systems, the diversity operating control modes of DC systems and the delay of valve control system to adjust commutation margin, lead to the problem of accuracy and applicability which commutation criteria faces. In this paper, influencing factors of commutation failure were deeply analyzed based on single DC transmission, multiple DC transmission and complex AC/DC hybrid power systems. Then suggestions for engineering indicator of commutation failure were proposed, and following issues should be further researched on: commutation failure criteria and control methods considering multiple factors, evaluation of multi-infeed HVDC systems and precise load model for the real power systems. The conclusion of this paper is available for reference to the research on AC/DC hybrid power systems in the future.
The fundamental cause of commutation failure is that the extinction angle is less than the inherent critical extinction angle of valve. However, the complex operating conditions of AC systems, the diversity operating control modes of DC systems and the delay of valve control system to adjust commutation margin, lead to the problem of accuracy and applicability which commutation criteria faces. In this paper, influencing factors of commutation failure were deeply analyzed based on single DC transmission, multiple DC transmission and complex AC/DC hybrid power systems. Then suggestions for engineering indicator of commutation failure were proposed, and following issues should be further researched on: commutation failure criteria and control methods considering multiple factors, evaluation of multi-infeed HVDC systems and precise load model for the real power systems. The conclusion of this paper is available for reference to the research on AC/DC hybrid power systems in the future.
引文
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