接近负荷极限的快速在线估算法

A Fast Online Estimated Method of Approuching Load Limit

接近负荷极限或PV曲线的鼻尖点以及电压不稳定已成为了现代电力系统的主要关注点之一,近年来,在线估算电压稳定极限吸引了许多电力研究者的关注。介绍了一种简单的在线估算接近负荷极限的局部指标,只需要使用两个连续的局部测量标量。该指标是在负荷视在功率在负荷极限点不变的前提下推导出来的,应用该方法可以实现采用数字继电器实施局部控制来阻止电压不稳定,以及在系统控制中心实施全系统的调整分析与控制措施。对IEEE 30节点系统进行了仿真计算,仿真结果验证了所提方法的可行性和有效性。

Approaching load limit or nasal tip point of PV curves, and vohage instability is one of the major focus of modern power systems, Online estimation of voltage stability limithas attracted the attention of many power researchers in recent years. A simple local index for online estimation of Approaching load limit is introduced, which needs only two consecutive local scalar measurement. This index is achieved based on the fact that the load apparent power is constant at load limit. The index is suitable in digital relays for implementation of local control to prevent voltage instability, and in the system control center, the adjustment analysis of the whole system and control measures. Simulation results on the IEEE 30-bus test system show the feasibility and effectiveness of the proposed method.