Reactive power redispatch for loss reduction using a modified power flow jacobian

This study addresses the problem of reactive power redispatch under bilateral power transactions. The proposed approach is to reduce active loss in a critical area, under the voltage collapse point of view, which is identified by the tangent vector technique. A methodology that uses an augmented load flow Jacobian is proposed to redispatch the reactive power and can be easily implemented in ordinary power flow programmes. Tests with the IEEE 14-bus test system and with a real Brazilian-107 bus system are carried out to illustrate the proposed approach. Results obtained by solving an optimal power flow problem are also presented for validation purposes.This study addresses the problem of reactive power redispatch under bilateral power transactions. The proposed approach is to reduce active loss in a critical area, under the voltage collapse point of view, which is identified by the tangent vector technique. A methodology that uses an augmented load flow Jacobian is proposed to redispatch the reactive power and can be easily implemented in ordinary power flow programmes. Tests with the IEEE 14-bus test system and with a real Brazilian-107 bus system are carried out to illustrate the proposed approach. Results obtained by solving an optimal power flow problem are also presented for validation purposes.