Research On Reactive Power Optimization Of Power System Based On PSASP And Sensitivity Analysis

With the continuous development of economy and science and technology,electric power industry has gradually become an important industry in China.Improving the security,reliability and economy of power system operation is always the key development direction of power industry.The distribution of reactive power in the power system has an important influence on the node voltage,network loss and operation cost of the system.Reactive power optimization is of great significance to the safe,reliable and economic operation of the system.Power system analysis and synthesis program PSASP is a commonly used simulation software in power industry.It has the characteristics of convenient operation,rich functions,stability and reliability.The mathematical analysis software MATLAB has strong programming ability and strong extensibility.Based on the co-simulation of PSASP and MATLAB,this thesis adopts the sensitivity analysis method to optimize the reactive power of the power system.The main work contents of this thesis are as follows:(1)The mathematical model of reactive power optimization of power system is analyzed,and the common optimization algorithms of reactive power optimization,such as linear programming method,nonlinear programming method and artificial intelligence algorithm,are compared and analyzed.The sensitivity analysis method used in this thesis is studied,and the sensitivity expression of the system node voltage to the reactive power variation is derived by the analytical method and the numerical method based on PSASP respectively.(2)Under the PSASP simulation environment,set up in Henan province“Xu Luo Zhou”district power grid model: first analyses“Xu Luo Zhou” network structure and the basic situation of regional power,and made the region more than 220 k V voltage class network topology structure,then the grid data from three of China power grid in the database for the extraction and into work,and establish the corresponding parameters of public library,the last use of generator and ac line for regional equivalent treatment was conducted on the external network.(3)In order to realize the automatic data interaction between PSASP and MATLAB,the execution mode of PSASP is analyzed,and the software execution process of power flow calculation and various data invocation methods are studied.On this basis,through MATLAB programming,MATLAB to PSASP power flow calculation function call,power flow calculation data modification,power flow calculation results extraction.(4)Two kinds of reactive power optimization models and methods based on PSASP and MATLAB co-simulation are established.The optimization model of voltage deviation index λ is established,the sensitivity calculation method is analyzed,and the optimization process of three different control variables and the treatment method of constraint conditions are studied.“Xu Luo Zhou” regional 220 k V node voltage was taken as the optimization object,and the main generator terminal voltage,500 k V step-down transformer tap and 220 k V substation reactive power compensation amount were taken as the control variables to verify and analyze.The voltage deviation coordination optimization model further considers the interaction between variables,establishes the sensitivity matrix and the corresponding equations,calculates the reactive power compensation amount of each node by using MATLAB matrix operation,and realizes the voltage deviation of each optimized node to reduce substantially.The model is verified by using the 220 k V network of“Xu Luo Zhou”regional power grid.The results show that the two models and methods achieve the expected optimization effect,and the obtained scheme is in line with the engineering practice.Based on the co-simulation of PSASP and MATLAB,a tentative study on reactive power optimization of power system is carried out,which provides a new idea for the collaborate-simulation of multi-software and the function expansion of simulation software.