Adaptive Undervoltage Load Shedding Strategy Based on Disturbance Scale Discrimination of Transient Voltage

doi:10.3969/j.issn.1000-7229.2015.03.011

Abstract

Abstract:

Conventional undervoltage load shedding（UVLS） scheme only focuses on local voltages without considering the response characteristics of transient voltage in whole gird. This paper analyzed the relationship between transient voltage drops and disturbance scale, proposed discriminant index for the disturbance scale of transient voltages based on the offset of voltage drops, and divided the transient voltage disturbance into two categories: the whole-grid transient voltage disturbance and the partial-region transient voltage disturbance. On the basis of the discriminant index results, an adaptive UVLS strategy based on the disturbance scale discrimination of transient voltages was constructed, with consideration on the dynamic process of voltage and frequency after the disturbance, which could solve the whole-grid transient voltage disturbance and the partial-grid transient voltage disturbance respectively with two adaptive load shedding schemes. Finally, the effectiveness and superiority of this strategy in different instability scenarios were verified by the simulation on the IEEE 39-bus system.

Key words: voltage stability, disturbance scale, load shedding, dynamic frequency, adaptive control

LIU Wei, LI Ye, ZHANG Baohui, LEI Junzhe. Adaptive Undervoltage Load Shedding Strategy Based on Disturbance Scale Discrimination of Transient Voltage[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(3): 65-70.

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