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access icon free New adaptive and centralised under-voltage load shedding to prevent short-term voltage instability

© The Institution of Engineering and Technology
Received 09/07/2017, Accepted 08/01/2018, Revised 16/11/2017, Published 09/01/2018

This study proposes a new adaptive and centralised under-voltage load shedding (UVLS) to prevent short-term voltage instability; it then examines the challenges related to the centralised UVLS. The proposed method uses a local measurement to estimate the amount of load shedding. It decreases the amount of load shedding by selecting the proper location of UVLS and shedding more powers within seconds after activating UVLS. Dynamic simulations are performed on the IEEE 118-bus test system, New England test system, and on Isfahan regional power grid (IRPG) as the case studies. Simulation results, when compared with the conventional multi-port network model and sensitivity-based methods, provide a considerable reduction in the active power shedding in addition to the number of the load shedding steps. Moreover, it indicates that the measurement bias errors have a considerable effect on UVLS. Finally, a method is introduced to overcome the effect of measurement errors.

Inspec keywords: load shedding; power grids

Other keywords: centralised UVLS; short-term voltage instability; measurement errors; active power shedding; Isfahan regional power grid; centralised under-voltage load shedding; adaptive under-voltage load shedding

Subjects: Power system management, operation and economics

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