Automatic reactive power and voltage control system based on power flow sensitivity & control cost analysis

The Automatic Voltage and Reactive Power Control System discussed is developed to control voltage and power factor automatically in the Dispatch Center. It is based on Pre-scanned Power Flow Sensitivity Analysis, by comprehensively evaluating operational risk cost, equipment control cost, and transmission Loss etc, it is designed to maintain voltage and power factor at optimal level, at the same time, decrease the transmission Loss and the frequency of control Operations. Taking load forecast and real time load into consideration, it also realizes predictive control and inverse voltage control. The system automatically creates the supervision points and control schemes, replacing the control rules generally used nationally. It is discussed how to get equipment control cost and comprehensively evaluating operational risk cost and is proved to be utilitarian. It also solves the difficult control problem of three-winding Transformers with two lower voltage monitor bus. This system has been used in Xiamen power system steadily and reliably, the economic and social benefits obtained is observable.