Voltage/reactive power problems can occur at any time during system operation, due to contingencies and/or to demand changes. Therefore, the ancillary service for reactive power is necessary to improve the operating state avoiding system security and reliability degradation. Control is to act in relatively small time periods. Such a service is to be acquired by the System Independent Operator from agents connected to the network, such as synchronous generators and compensators, and static VAR compensators. This paper proposes a methodology for minimizing the cost of the reactive power service provided by generators considering the coupling among it, the power reserve service and the energy market. The ällocated reserve" payment method for the reserve power service was used. Numerical results with the IEEE 14-Bus and IEEE 30-Bus test-systems are presented in order to illustrate the mentioned coupling as well as its economic implications.
ancillary service; reactive power support; power reserve; power market; evolutionary computation
