Research On Safety And Stabilityof Regionalpower Grid With PSASP

So far,the malignant accidents caused by the grid instability and large-scale power outages and system breakdowns in the system have become commonplace all over the world,which have had a great impact on the social economy and people's lives.Nowadays,with the rapid development of FACTS and ultra high voltage direct current transmission,China's power system is forming a new era of EHV,cross-regional,AC and DC transmission based on UHV power grid.With the prosperity of people's life,the acceleration of the electrification process and the load of electricity is increasing rapidly,people have put forward higher requirements for the power supply quality and reliability of the power grid.Thus,the security and stability of the power grid is highly.In recent years,the economy of Hanzhong has developed rapidly.and the demand for electric energy is increasing year by year,and the quality of electricity is also higher.However,due to the influence of geographical environment,the power supply of Hanzhong Power Grid is far from the load center,and it is more dependent on the external power supply,which is a typical receiver network.Therefore,to build Hanzhong power grid model according to the actual operation situation,stability analysis,and find out the weak links and problems in the running of the system,specific issues research and analysis and put forward solutions,is of great significance for the stable operation of power grid in Hanzhong.This paper mainly uses the Power System Analysis Software Package(PSASP)to conduct a comprehensive calculation and analysis of Hanzhong Power Grid from the aspects of grid security and stability.Firstly,the functional modules and model building steps of PSASP software are introduced,and the mathematical model of power flow calculation is analyzed.Based on that,the Hanzhong power grid model is built.Then,the power flow calculation and static N-1 calibration of the Hanzhong power grid were carried out,and the safety and power supply reliability of the power grid were analyzed.Including the power flow calculations under the four typical operating modes,the main section flow analysis,and the N-1 check of the main tie line in the eastern Hanzhong power supply area and the N-1 check of the 110 kV main transformer across the entire network.On this basis,the static voltage stability of Hanzhong power grid is studied by the regional load margin discrimination method.The voltage stability of the four power supply areas is preliminarily analyzed and judged.Then the static voltage stability of Hanzhong power grid is analyzed by the modal analysis method,and the participation factor of each bus is calculated.The more comprehensive and detailed information of the voltage stability of Hanzhong power grid is given,and the weak nodes and weak areas of the Hanzhong power grid are determined on this basis.Finally,based on the previous analysis and calculations,recommendations and measures are put forward for the safety and stability issues that arise during the operation of the power grid.The main ones are: to increase the regional load margin by adjusting the terminal voltage of the generator and increasing the parallel reactive power compensator;Regulate the tapping of transformers in Yangxian substation and the measures of parallel reactive power compensation at the end of the line to improve the low voltage in Yangxian County's power supply area;analyze the problems of heavy load and low reliability of power supply in Hanzhong power supply area,and put forward suggestions Measures;analyzed the problem of the trend of ultra-stable stability in eastern Hanzhong and put forward recommended measures;analyzed the static safety and stability problems in Yangxian County power supply area and put forward the recommended measures.