Abstract
Misbalance between reactive power production and consumption in power system causes the variation of node voltage outside the proposed limit. It is a main task for system operators to maintain the voltage profile against any unexpected disturbance. In this paper a practical coordinated secondary voltage control (CSVC) scheme was present, which was based on the optimal power flow algorithm. Additional measurements were used in order to offset the effects of the loads variation among neighboring areas. By taking the changing tendency of reactive power into consideration, a discrete optimal control model was proposed. An optimal power flow calculation was used to get the control law in each control step with the consideration of reactive power changing tendency. The simulation results as examples on the large power system were presented to illustrate the validity of the control scheme for coordinated secondary voltage control.
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