Local optimal load-shedding with allowance for voltage deviation

Goro Fujita, Goro Shirai

研究成果: Article

抄録

This paper describes an optimal load-shedding method which can be applied to local buses in order to suppress voltage deviations, based on local information obtained at each bus. When a generation outage occurs, adequate amounts of loads must be shed within a few seconds in order to maintain the balance between supply and demand. This method is able to decide quickly the optimal amounts of loads to be shed after the fault. The proposed method is based on the fact that the location of the fault can be estimated exclusively from power flow deviations at local buses, measured after the outage. Because the amounts of load to be shed have constraints, it is necessary to find the optimal factors which decide the amounts of load-shedding at each bus by quadratic programming. To solve this problem we first linearize the study system. Next, in order to relate power flows to voltage deviations at each bus, the voltage sensitivity factors obtained by ac power flow calculation are evaluated. Numerical simulations with 4-machine and 9-machine power system models show the effectiveness of the proposed method. It distributes adequate loads which are almost identical to the completely optimized loads, and it produces smaller voltage deviations than the conventional method. Improved transient characteristics of voltage deviations are also demonstrated.

元の言語English
ページ(範囲)35-43
ページ数9
ジャーナルElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
119
発行部数1
出版物ステータスPublished - 1997
外部発表Yes

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Electric potential
Outages
Quadratic programming
Computer simulation

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

これを引用

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AB - This paper describes an optimal load-shedding method which can be applied to local buses in order to suppress voltage deviations, based on local information obtained at each bus. When a generation outage occurs, adequate amounts of loads must be shed within a few seconds in order to maintain the balance between supply and demand. This method is able to decide quickly the optimal amounts of loads to be shed after the fault. The proposed method is based on the fact that the location of the fault can be estimated exclusively from power flow deviations at local buses, measured after the outage. Because the amounts of load to be shed have constraints, it is necessary to find the optimal factors which decide the amounts of load-shedding at each bus by quadratic programming. To solve this problem we first linearize the study system. Next, in order to relate power flows to voltage deviations at each bus, the voltage sensitivity factors obtained by ac power flow calculation are evaluated. Numerical simulations with 4-machine and 9-machine power system models show the effectiveness of the proposed method. It distributes adequate loads which are almost identical to the completely optimized loads, and it produces smaller voltage deviations than the conventional method. Improved transient characteristics of voltage deviations are also demonstrated.

KW - Load-shedding

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KW - Power flow calculation

KW - Power generation outage

KW - Quadratic programming

KW - Voltage sensitivity coefficient

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