The Implement Of Harmony Values In Distribution Control Of Voltage And Reactive Power

With the development of economy and the improvement of people's living quality, the need of power supply is increasing quickly, as well as there is high requirement to the reliability and quality of power supply. Distribution network is an important part of power system directly facing consumers. Reactive power optimizing problem takes a super important role in protecting the secure operation of network and power supply. The electric quality is mainly reflected by the voltage; The power loss is technical and economic index of electric utility. Some research work of voltage reactive power optimization control of region network has been done in order to improve the voltage quality and decrease the power loss; Model and rule of reactive power optimization control of substations are analyzed and ANN scheme of voltage reactive power control of single substation is proposed based on the domestic and abroad status. Reactive power optimization problems can be intrinsically formulated using a large-scale mixed integer nonlinear programming model involving both discrete and continuous variables. Usually, when some existing continuous optimization algorithms are used to solve this model, all discrete variables are treated as continuous variables until they are approximately optimization optimized and then rounded off to their nearest discrete values. Also the remaining continuous variables are determined by solving a conventional power flow or an optimal power flow problem.As the methods of voltage and reactive power controlling in traditional sense, the intensive and dispersed control methods both have defects and limitations respectively. Newer theory of relatively dispersed control has not been developed. A novel concept, named dispersed reactive power optimization and dispersed controlmethod based on the controlling of voltage and reactive power to all rated buses of substation is present in this paper. Based on this concept, the host station can get the information of load and states of switches through communicating with sub system; On the basis of the known data, we can build the model state and forecast the load the next day by using filter method of kalman. so we will get the active and reactive power curves; afterwards we can optimize the reactive power in all power networks utilizing the model of dispersed reactive power optimization and expanded interior algorithm; besides, this paper gives the computational method of the control tension of voltages and reactive power in power station.Based on the method and optimization program, which is presented in this paper, we take it into practice on the real distribution system. Also we take the load into reactive optimization in different power substation and give the regions of voltages and reactive power. Result from the numerical example proves this algorithm and computational method is practical and efficient. Tracking with the curves of voltage and reactive power completely can not only be taken into consideration, but also taken into the constraint of the minimal movement times of the transformers joints and maximal allowable daily operating times of capacitors. This system has well opening property and expandability, it can not only be used in whole power system ,but also can be used in a certain part of power system.reactive power optimization; Kalman filtering; expanded interior algorithm; distribution control; harmony values...