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Power System Voltage Stability Margin Identification Using Local Measurements

机译：电力系统电压稳定性边缘识别使用本地测量

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摘要

Voltage stability margin is essential to be known in advance to avoid voltage collapse and system blackout. This paper presents a new technique for determining the voltage stability margin, so that a corrective decision is taken in the proper time. The proposed algorithm is based on recursive least error square to measure the Thevenin's impedance at the bus in question as the busload changes. The proposed technique utilizes the past measurements together with the recent local measurements, bus voltage and load current, to predict Thevenin's impedance. The voltage instability occurs at a point where the load impedance equals Thevenin's impedance. Prior to this point the voltage margin can be predicted using the proposed technique. The method is tested on the IEEE 30 bus system for a single bus-load change, short-term voltage stability, and when the buses loads change with the same rate, long-term voltage stability study. Unlike the other techniques the proposed algorithm has the ability to estimate digitally the Thevenin's impedance at the load bus in question.
机译：电压稳定性边缘是必须提前知道的，以避免电压崩溃和系统停电。本文介绍了一种用于确定电压稳定余量的新技术，从而在适当的时间内采取纠正措施。该算法基于递归最小错误广场，以测量诸如汇载变化的公共汽车上的阻抗。所提出的技术利用过去测量与最近的局部测量，总线电压和负载电流一起，以预测临时的阻抗。电压不稳定性发生在负载阻抗等于临时阻抗的点。在此之前，可以使用所提出的技术来预测电压裕度。该方法在IEEE 30总线系统上测试，用于单个总线负载变化，短期电压稳定性，以及当总线负载时，通过相同的速率，长期电压稳定性研究。与其他技术不同，所提出的算法能够估计在所讨论的负载总线上的数字的临时阻抗。

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