Research On Operational Risk Assessment And Suppression Methods Of Transmission Lines

In the early days,the scale of the power grid was small,and the disturbance to the power grid would have a lower impact on the stability of the system.With the continuous development of the power industry,in order to solve the problem of uneven power distribution,the construction of a large-capacity,long-distance transmission grid has become the main development direction of the current power system.However,due to the continuous expansion of the scale of the power system and the interconnected operation of the major power grids,the stability and safety issues faced by the system have become increasingly prominent.In addition to external influencing factors,the internal flow of the system will also have an impact on the operating status of the transmission line.Risk assessment,as an effective method to analyze the reliability of transmission lines,can not only predict the operation status of transmission lines,but also has a good ability to identify high-risk operating lines in the system,which provides a realistic way for the maintenance of transmission lines.Guiding significance.On the basis of assessing the operational risks of transmission lines,in view of the key influencing factors that affect the operational status of the transmission lines,suppression measures are adopted to improve the operational reliability of the transmission lines,thereby reducing the operational risks of the lines.First of all,in view of the development status and existing problems of largecapacity and long-distance transmission grids,this paper introduces in detail the application and research status of transmission line operation risk assessment in the field of power systems.Combined with the consideration of external factors affecting the operation status of transmission lines,the Markov process is used to quantify the probability of transmission line failures under external factors,and further based on the system power flow,a model for calculating the actual operating failure probability of the line is established.Secondly,considering the different indicators that affect the operation status of the transmission line,define the related fault severity indicators and the comprehensive impact severity indicators based on the combination of the analytic hierarchy process and the entropy weight method.Realize the assessment of the operation risk of the transmission line.On the basis of the established model,PSCAD/EMTDC simulation software is used to analyze the influence of the system bus voltage,line load level,and node load loss on the system operation status after the transmission line is disconnected.Finally,comprehensively consider the constraints that affect the evaluation indicators of the transmission line operation status,and focus on the factors affecting the line overload.It is proposed to use the improved particle swarm algorithm to optimize the optimal compensation degree of the controllable series compensation device,and combine the established line risk Evaluate the model and analyze the inhibitory effect of the controllable series compensation device on the system operation risk.