杨晓雷,韩中杰,叶琳,江俊贤,王奕鑫,王冠中
YANG Xiaolei,HAN Zhongjie,YE Lin,JIANG Junxian,WANG Yixin,WANG Guanzhong

• 1:国网浙江省电力有限公司嘉兴供电公司
• 2:国网浙江省电力有限公司
• 3:浙江大学工程师学院
• 4:浙江大学电气工程学院

摘要(Abstract)：

准确量化LCC-HVDC（电网换相换流器型高压直流输电）及VSC-HVDC（电压源换流器型高压直流输电）多馈入系统的传输极限和电网强度是保障新型电力系统稳定运行的关键之一。通过改进传统LCCHVDC交直流系统的电网强度量化方法，提出了量化混合直流馈入系统电网强度的短路比指标，以此分析交直流系统的传输极限。首先，根据潮流方程建立混合直流馈入系统的准稳态模型；其次，通过分析雅克比矩阵奇异性与直流馈入系统功率传输极限的关系，得到用于评估混合直流馈入系统中LCC-HVDC传输极限的短路比指标，并分析指标临界值与VSC-HVDC运行方式的灵敏度关系；最后，通过PSCAD/EMTDC及MATLAB平台验证了短路比指标的有效性。分析结果表明：VSC-HVDC在受端定电压控制方式下具有更好的电压支撑能力，同时VSC-HVDC的运行方式对LCC-HVDC传输极限的影响较小，可通过所提指标进行定量分析。
The accurate quantification of transmission limit and grid strength of the multi-infeed LCC-HVDC(linecommutated converter technology-based high-voltage DC) and VSC-HVDC(voltage source converter technologybased high-voltage DC) systems has become one of the critical measures to ensure the stable operation of new power systems. Through the improvement of the grid strength quantification method of the traditional LCC-HVDC AC/DC systems, a short-circuit ratio(SCR) index for quantifying the grid strength of the hybrid DC infeed systems is proposed to analyze the transmission limit of the AC/DC systems. Firstly, a quasi-steady-state(QSS) model of the hybrid DC infeed systems is built under the flow equation. Secondly, the SCR index for evaluating the transmission limit of LCC-HVDC in the hybrid DC infeed systems is obtained by analysis of the relationship between the Jacobian matrix singularity and the power transmission limit of the DC infeed systems. The sensitivity relationship between the index threshold and the operation mode of the VSC-HVDC system is analyzed. Finally, the effectiveness of the SCR index is verified using PSCAD/EMTDC and MATLAB platform. The analysis results show that the VSC-HVDC system is superior in voltage support under the constant voltage control mode at the receiving end. The operation mode of the VSC-HVDC system that exerts less influence on the transmission limit of the LCC-HVDC system can be quantitatively analyzed by the proposed index.

关键词(KeyWords)： 混合直流馈入系统;传输极限;雅克比矩阵;短路比;电网强度
hybrid DC infeed systems;transmission limit;Jacobian matrix;SCR;grid strength

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211JX2000KD）

作者(Author): 杨晓雷,韩中杰,叶琳,江俊贤,王奕鑫,王冠中
YANG Xiaolei,HAN Zhongjie,YE Lin,JIANG Junxian,WANG Yixin,WANG Guanzhong

DOI: 10.19585/j.zjdl.202301004

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