Load-Nodal On-Line Voltage Stability Index for Power System

doi:10.3969/j.issn.1000-7229.2016.02.010

Abstract

Abstract:

This paper applies phasor measurement unit （PMU） to measure the real-time data including the voltage and power flow of any （non PV） node and adjacent busbar, and constructs a network equivalent model. Meanwhile, we present the on-line voltage stability index with comprehensive consideration of the active power and reactive power of load node based on this model. And we suggest that the on-line voltage stability indexes of active power and reactive power can be used as active power or reactive power margin for the characterization of load node respectively, which can be the supplement to the on-line voltage stability index of node （system）. If the on-line voltage stability index of load note approaches to 1, it shows that the power system draws near voltage collapse. Simulation results of EPRI-36 bus system show that the proposed method can effectively judge the system voltage stability, and is suitable for the monitoring and prediction of on-line voltage stability. Compared with other indexes, the rationality and superiority of the proposed model and index are reflected. Finally, we briefly explain the feasibility of the proposed method through the voltage stability margin evaluation of load node in Shandong 500 kV main network.

Key words: voltage stability, on-line voltage stability index, phasor measurement unit（PMU）, network equivalent model

CLC Number:

TM 712

GAO Feng, WANG Yanwen,GUO Lin,XU Rui. Load-Nodal On-Line Voltage Stability Index for Power System[J]. Electric Power Construction, 2016, 37(2): 69-77.

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