基于路径耦合负荷增长与校正发电机响应的电压稳定性评估
Voltage Stability Assessment with Path-Coupled Load Growth and Corrective Generator Response
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中文总结 AI 辅助
本文提出一种纳入校正发电机响应的路径耦合电压稳定裕度评估方法，可捕捉发电机重新调度对评估的影响，为裕度增强提供指导并量化稳定提升的经济成本。
中文摘要 AI 辅助
电压稳定裕度评估对于可再生能源主导电力系统的安全运行至关重要。传统基于连续法的方法在预设的负荷增长路径上，以固定的发电机参与度评估裕度，而实际运行中，当系统接近电压崩溃时，可通过重新调度发电机来缓解电压应力、重塑潮流轨迹。本文提出一种路径耦合裕度评估方法，将校正发电机响应纳入静态电压稳定裕度评估；在该方法中，每一步连续计算时同时确定负荷增长方向与发电机响应方向，使评估轨迹在追踪系统向电压崩溃点演进的同时考虑发电机响应，电压稳定裕度则通过该耦合轨迹上累积的有功负荷增量来评估。基于所得轨迹与崩溃点，进一步推导可行的重新调度方向以提升当前运行状态的裕度；电压稳定增强的经济成本通过边际稳定成本量化，为额外的稳定支撑提供经济指标。对多个测试系统的案例研究表明，所提框架可有效捕捉校正发电机重新调度对电压稳定评估的影响，为裕度增强提供有效指导，并量化电压稳定提升相关的成本。
英文摘要
Voltage stability margin assessment is essential for the secure operation of renewable-dominated power systems. Conventional continuation-based methods evaluate the margin along predefined load-growth paths with fixed generator partic- ipation, while practical operation allows generators to be redis- patched to alleviate voltage stress and reshape the power-flow trajectory as the system approaches voltage collapse. This paper proposes a path-coupled margin assessment approach that incor- porates corrective generator response into static voltage stability margin assessment. In the proposed approach, the load-growth direction and generator response direction are simultaneously determined at each continuation step, enabling the assessment trajectory to account for generator response while tracing the system toward voltage collapse. The voltage stability margin is then evaluated by the cumulative active load increase along this coupled trajectory. Based on the obtained trajectory and collapse point, a feasible redispatch direction is further derived to improve the margin of the current operating state. The economic cost of voltage stability enhancement is quantified through a marginal stability cost, providing an economic indicator for additional sta- bility support. Case studies on various test systems demonstrate that the proposed framework can effectively capture the impact of corrective generator redispatch on voltage stability assessment, provide effective guidance for margin enhancement, and quantify the cost associated with voltage stability improvement.
