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A Comparative analysis of line stability indices for dynamic voltage stability

机译：动态电压稳定性的线路稳定性指标比较分析

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摘要

Modern power system networks are often subjected to high stress due to meet the growing energy demand and operated close to their maximum stability limits. As a result, these networks are becoming less secure and always expecting the risk of voltage instability. Therefore, it has become inevitable to incorporate dynamic voltage stability analysis during planning of modern power system networks. As it provides the most accurate response of the actual dynamics of voltage stability when appropriate modelling is included. The best method to do dynamic voltage stability analysis is by utilizing the voltage stability indices (VSI). Hence in this paper, four system variable based VSI namely Lmn index, LQP index, fast voltage stability index (FVSI) and voltage collapse point indicators (VCPI) have been considered to identify the most vulnerable or weakest regions in power system network. During the index calculation load increment are conducted dynamically in two ways: only Q load and PQ load together. Based on the sensitivity of the indices towards the voltage collapse point, a comparative study among the indices has also been conducted. The test case under investigation is IEEE-14 bus system which has been designed and simulated in PSCAD environment.
机译：由于满足不断增长的能源需求，现代电力系统网络经常承受很高的压力，并且接近其最大稳定性极限运行。结果，这些网络变得越来越不安全，并且总是期望有电压不稳定的风险。因此，在现代电力系统网络的规划过程中纳入动态电压稳定性分析已成为必然。当包含适当的建模时，它可以提供对电压稳定性实际动态的最准确响应。进行动态电压稳定性分析的最佳方法是利用电压稳定性指数（VSI）。因此，在本文中，考虑了四个基于系统变量的VSI，即Lmn指数，LQP指数，快速电压稳定指数（FVSI）和电压崩溃点指标（VCPI），以识别电力系统网络中最脆弱或最弱的区域。在索引计算期间，以两种方式动态进行负载增量：仅Q负载和PQ负载一起。基于指标对电压崩溃点的敏感性，还对指标进行了比较研究。正在研究的测试用例是已在PSCAD环境中设计和仿真的IEEE-14总线系统。

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