Study on Reactive Power Centralization Optimization and Voltage Distribution Control Strategy in Distribution and Transmission System

The reactive power and voltage control is important to loss reduction and energy saving of the grid.According to the characteristics of loads and reactive power voltage devices,this paper introduces a new method of voltage control which classifies the reactive power and voltage control of distribution and transmission system into two-level voltage control mode.The first level voltage control,centralized optimization,aimed at the notable changes of loads,can be used in switching of capacitors.The secondary voltage control,voltage distribution control,which complies with the principal of on-the-spot distribution control,regulates the transformer taps and adjustable capacity of the reactive power devices relying on the mode of nine-zone graph theory.Through such a control method,the control results and efficiency can be optimized.The cited examples can demonstrate that this method is the optimal one in controlling reactive power and voltage of distribution and transmission system.