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中文摘要：
发现重合闸时序对特高压（ultra—highvoltage，UHV）交直流混联系统暂态电压稳定性有较大的影响，构造单负荷特高压交直流混联输电无穷大系统来探讨其机制。分别在恒阻抗、恒电流和恒功率3种静态负荷模型以及感应电动机动态负荷模型下，考虑故障点位置变化，推导出交流线路发生单相短路，单相重合于永久故障时负荷侧母线电压的解析表达式，发现各种负荷模型下均存在若干个影响重合时序的故障区段。根据计算出的故障区段，采取恰当的重合时序，有利于提高系统暂态电压稳定性。提出实际系统中离线计算与在线匹配相结合的单相重合时序整定策略，并论述其在电力系统三道防线中的作用和地位。2010年南方电网的仿真结果验证了其正确性和有效性。
英文摘要：
ABSTRACT： Significant effect of single-phase reclosure sequence On transient voltage stability of ultra-high voltage AC/DC parallel system was discovered. To expound mechanism of this phenomenon, ultra-high voltage （UHV） AC/DC parallel transmission network with single load connected to infinite bus system was constructed. Under constant impedance load model, constant current load model, constant power load model and inductive motor dynamic load model, voltage of load bus when re-close to single-phase permanent fault was calculated and analytic expression of which was derived. By comparing the bus voltage under two reclosure sequences, it was discovered that certain fault zones exist by which reclose sequcence will be affected. By adopting proper re.close sequence according to the fault zones calculated, bus voltage can be increased, also slip ratio can be decreased when breaker trips again under dynamic load model, which is beneficial to transient voltage stability of system. In view of the complex load characteristics, various operating conditions and fault locations in actual power system, setting strategy by combining off-line calculation and on-line setting was proposed to enhance transient voltage stability, the function and status of which in the three defending lines of a power system was also discussed. Correctness and effectiveness of the re-closure strategy was verified by simulation results in single load infinite bus system and 2010 southern China power gird.
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