| 引用本文: | 刘晓明,沈伊南,陈 海,等.考虑输电线路直流改造的交直流混联系统可靠性评估[J].电力系统保护与控制,2026,54(05):97-106. |
| LIU Xiaoming,SHEN Yinan,CHEN Hai,et al.Reliability assessment of hybrid AC/DC systems with AC-to-DC line conversion[J].Power System Protection and Control,2026,54(05):97-106 |
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| 摘要: |
| 交流线路直流改造(交改直)能够在不增设输电走廊的情况下增大输电线路容量，但改造后直流输电系统(high voltage direct current, HVDC)对整个系统的可靠性影响难以量化。为此，提出一种考虑交改直的交直流混联系统可靠性评估方法。首先，分析常规双极直流输电(bi-pole HVDC, BP-HVDC)、备用式双极直流输电(redundant bi-pole HVDC, RBP-HVDC)和三极直流输电(tri-pole HVDC, TP-HVDC)子系统运行状态与传输容量的对应关系。其次，基于参数矩阵化频率与持续时间(frequency and duration, FD)法建立HVDC可靠性模型。最后，以IEEE-RTS79系统为算例，采用序贯蒙特卡洛法抽样交流元件和HVDC状态，结合最优切负荷模型，求得系统可靠性指标，进而评估交改直对交直流混联系统可靠性的影响。研究结果表明：交改直对系统可靠性的影响与原线路传输容量极限有关，对接近传输容量极限的线路直流改造能够提升系统可靠性和新能源消纳能力。 |
| 关键词: 交改直 三极直流输电 可靠性评估 序贯蒙特卡洛法 交直流混联 |
| DOI：10.19783/j.cnki.pspc.250780 |
| 分类号: |
| 基金项目:国家自然科学基金面上项目资助(52577155) |
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| Reliability assessment of hybrid AC/DC systems with AC-to-DC line conversion |
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LIU Xiaoming1, SHEN Yinan1, CHEN Hai1, CHEN Yulong1, WEN Fuyue2
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1. State Key Laboratory of Intelligent Power Distribution Equipment and System, School of Electrical Engineering, Hebei University
of Technology, Tianjin 300401, China; 2. China EPRI Electric Power Engineering Co., Ltd., Beijing 102200, China
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| Abstract: |
| Converting existing AC transmission lines to DC operation (AC-to-DC line conversion) can increase transmission capacity without constructing additional transmission corridors. However, after conversion, the impact of HVDC systems on overall system reliability is difficult to quantify. Therefore, a hybrid AC/DC system reliability assessment method incorporating AC-to-DC line conversion is proposed. First, conventional bi-pole HVDC (BP-HVDC), redundant bi-pole HVDC (RBP-HVDC), and tri-pole HVDC (TP-HVDC) configurations are analyzed to establish correspondence between subsystem operating states and transmission capacities. Second, a HVDC reliability model is established based on the parameter-matrixed frequency and duration (FD) method. Finally, using the IEEE-RTS79 system as the test case, sequential Monte Carlo simulation is used to sample the states of AC components and HVDC systems. Combined with an optimal load shedding model, system reliability indices are obtained to evaluate the impact of AC-to-DC line conversion on the reliability of hybrid AC/DC systems. The results indicate that the impact of AC-to-DC line conversion on system reliability depends on the original transmission capacity limit of the lines; converting lines that operate close to their capacity limits can improve system reliability and enhance new energy accommodation capability. |
| Key words: AC-to-DC line conversion tri-pole DC transmission reliability assessment sequential Monte Carlo method hybrid AC/DC system |
