On the Assignment of Voltage Control Ancillary Service of Generators in Spain

The aim of the Spanish voltage control ancillary service is the minimization of the transmission losses while keeping the system away from voltage instability. The latter target can be achieved maintaining an adequate voltage profile in normal operating condition and assuring that generators exhibit...

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Bibliographic Details
Published inIEEE transactions on power systems Vol. 22; no. 1; pp. 367 - 375
Main Authors Miguelez, E.L., Cerezo, F.M.E., Rodriguez, L.R.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2007
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Ancillary services
Ancillary services (AS)
Control systems
Economic forecasting
Electric potential
Electricity supply industry
Generators
Linear programming
linear programming (LP)
Load flow
Mathematical models
optimal power flow (OPF)
Optimization
power loss reduction
Power system analysis computing
Power system control
Power system modeling
Propagation losses
Reactive power
reactive power dispatch
Transmission loss
VAR/voltage control
Voltage
Voltage control
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Summary:The aim of the Spanish voltage control ancillary service is the minimization of the transmission losses while keeping the system away from voltage instability. The latter target can be achieved maintaining an adequate voltage profile in normal operating condition and assuring that generators exhibit enough reactive margins that guarantee that the system voltages will remain under acceptable values in case of contingencies. The service has been designed in Spain to be partially mandatory and partially subject to payment based on market-driven rules and performance evaluation. In the annual time scope, the optional reactive offers submitted by the service suppliers are selected analyzing a number of forecasted scenarios. This paper explains the implementation of the Spanish voltage control ancillary service (VCAS) that is provided by generators in the annual time scope. For this purpose, a mixed-integer linear programming optimal power flow (OPF) is used. Reactive bids of generators are modeled within each scenario by modifying the reactive limits of the generators. The use of the proposed OPF in the assignment of the voltage control ancillary service is explained and illustrated using actual scenarios of the Spanish power system
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ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2006.888984