A New Linear Programming Model And Algorithm Of Voltage And Reactive Power Control

The control of voltages and reactive power represent the most important activities in the operation of modern power systems. The operators manipulate the compensate devices rationally to achieve an overall improvement of the systems security and economy.The writer gave a brief introduce of the optimal reactive power flow, then analyzed optimal models and algorithms comprehensively. Considering the limitations of existing models, A new linear approach are put forward for the control of voltage and reactive power. Assuming bus load should be as a current source unchanged, the approach employs node-voltage-equation for determining functions relating bus voltages and the control variables. Based on the decoupling principle of P and Q, the objective function for minimizing the systems losses is also established.Because the taps are changed frequently in optimization, and the admittance matrix must be modified correlatively, The transformer's mathematical model is developed in this dissertation: mutual admittance or self-admittance are expressed in t and t~2 respectively, that offers significant advantage over linearization of the admittance matrix.For large-scale power systems, interior-point algorithm is used to solve the optimal adjustment to the control variable. According to the results of practical application to optimal problems of two utility systems, the efficiency and correctness of the model is proven to be satisfactory.