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《Automation of Electric Power Systems》 2005-05
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Optimal Reactive Power Planning Incorporating Steady State Voltage Stability Constraints

LIU Ming-bo, YANG Yong(South China University of Technology, Guangzhou 510640, China) (Foshan Branch, Guang-dian Power Grid Group Co Ltd, Foshan 528000, China)  
The cost that integrates investment of reactive equipments with active-power loss of electric power network is selected as objective function. The two sets of constraints concerning voltage profile and voltage stability are simultaneously considered to investigate reactive-power planning problem. A voltage stability margin that is not lower than a certain minimum permissible stability margin is chosen to express the voltage stability constraint. Two groups of variables and power-flow equations are introduced respectively for the normal state and the critical state so that the voltage stability margin can be represented explicitly by the difference between total apparent power of load in the critical state and that in the normal state. Compared with conventional reactive power planning model, this model can obtain optimal reactive power configuration scheme directly under a suitable voltage profile according to a target value of the stability margin. However, the number of equality and inequality constraints and variables increases obviously, which makes computational efforts greater than that in the conventional reactive power planning model. Results on IEEE 14-bus and IEEE 118-bus test systems show that nonlinear primal-dual interior-point method can be used for solving this model with satisfactory precision and convergence.
【Fund】: 国家自然科学基金资助项目(50277013) 广东省自然科学基金资助项目(011648)。
【CateGory Index】: TM715
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