An Efficient Technique for Reactive Power Dispatch Using a Revised Linear Programming Approach

This paper presents a mathematical formulation of the reactive power operation/planning problem. The outstanding features of the proposed method are represented by the fact that it requires no matrix inversion, will save computation time and memory space, and hence can be implemented on very large-scale power systems. The method employs a linearized objective function and constraints, and its approach is based on adjusting control variables which are tap positions of transformers and reactive power injection. Linear programming is used to calculate voltage increments which minimize transmission losses, and adjustments of control variables are obtained by a modified Jacobian matrix. This approach would greatly simplify the application of decomposition methods in power systems planning and operation. The proposed algorithm is applied to a six-bus system and the IEEE 30-bus system and numerical results are presented. These results verify the superiority of the proposed method over the existing ones.