基于耦合单端口网络理论的广域负荷裕度灵敏度及其在电压稳定控制中的应用（英文）

Coupled Single-Port Circuit Concept Based Wide-Area Load Margin Sensitivity and Its Application on Voltage Stability Control

负荷裕度灵敏度是分析和研究电压稳定评估和控制的重要方法。但传统基于电力系统代数模型的负荷裕度灵敏度分析方法需要全网精确的模型并且需要大量的运算,因此不适合在线应用。基于耦合单端口网络理论,提出一种适合在线应用的基于广域负荷裕度灵敏度的电压稳定评估与控制的新方法。利用电力系统的广域量测信息,推导出负荷裕度对有功功率、无功功率及机端电压的灵敏度,该方法比基于模型的分析方法在计算上更有效率。针对所提出的负荷裕度灵敏度,进一步提出了改善电压稳定性的多步骤控制策略。将该方法应用在IEEE 39节点系统中,仿真结果不仅验证了负荷裕度灵敏度,同时也验证了多步骤控制策略与传统连续潮流的方法相比在判定系统电压崩溃点上的有效性。为进一步验证所提出负荷灵敏度的通用性,将其应用到IEEE 14、IEEE 57、和IEEE 300节点系统中。在多个仿真系统中的结果表明,本文提出的基于广域负荷裕度灵敏度的电压稳定评估与控制的新方法有很好的在线应用的潜力。

Loading margin sensitivity analyses are often performed for voltage stability assessment （VSA） and control due to the com- plexity of such applications. Traditional power system algebraic model based loading margin sensitivity analyses require full detailed system models and non-trivial amount of computation, therefore they are not good candidate for online applications. Based on the cou- pled single-port circuit concept, this paper proposes a new method of measurement-based wide-area loading margin sensitivity （WALMS） for VSA and control that is suitable for online applications. Enabled by wide-area measurement systems and their measure- ments, the proposed model derives the analytical expression of the sensitivity of loading margin （LM） versus active power injection, reactive power injection and generator terminal voltage. Consequently, the WALMS is computational more efficiently than its model- based counterparts. Based on the WALMS, a multi-step control strategy is developed to improve voltage stability. Simulation results on the IEEE 39-bus system verify the WALMS and validate the multi-step control strategy benchmarked with traditional continuation power flow when system is close to voltage collapsing point. Further tests on the IEEE 14, 57 and 300-bus systems are performed to demonstrate the applicability of the WALMS. Evidently, the multiple simulations results show that the measurement-based WALMS has great potential to be integrated to online VSA and control applications.