考虑离散约束条件的电力系统电压-无功集中控制算法研究

Research on centralized control algorithm of voltage/reactive power of power system considering discrete constraints

针对现代电力系统中遇到的电压质量问题,对基于非线性原-对偶内点法的电力系统电压-无功集中控制策略在静态电压分析中的应用进行了研究。针对有载调压变压器变比和无功补偿等离散变量,直接将其在迭代过程中逐次归整;针对不同的控制类型,将其作为模型的等式约束或不等式约束。然后以改进的IEEE14节点系统为算例进行仿真,将离散变量法与连续变量法的仿真结果进行比较,并对结果进行了详细论述。仿真结果表明,所提方法能够同时考虑各种不同类型的控制,有效地处理系统中的离散变量和连续变量,减小线路损耗,改善电压质量,保持系统电压稳定,具有很好的收敛性和精确度。

As for the power quality issue that modem power system is facing, this paper studies the application of centralized control of voltage/reactive power in the analysis of voltage stability in power system based on the nonlinear primal-dual interior-point method. This paper discretizes the discrete variables such as transformers＇ tap ratios and output of shunt capacitors in every iteration, and coordinates different kinds of control strategies by putting them into the equality or inequality constraints of the model built in this paper. The simulation results are compared between continuous method and discrete method by the simulation on improved IEEE14 nodes system. This paper also analyzes the simulation results in detail. The simulation results indicate that this method can consider different kinds of control strategies simultaneously and handle the discrete variables and continuous variables effectively, minimize the line loss, improve power quality and keep the stability of voltage. Also, it has a fast convergency and good accuracy. This paper is supported by National Natural Science Foundation of China （No. 51107040）.