Study On Economic Dispatch Of Power Grid Under The Thermal Overload Risk Of Overhead Conductor With Parallel Groove Clamp

The operating temperature of high voltage overhead line fittings is an important parameter for safe operation of transmission network,and the local thermal overload caused by the loosening of fittings is a serious threat to the operational safety of the transmission line.The traditional economic dispatch model lacks the thermal overload risk of the line fittings,which improves the economic operation of power grid while reducing the safety of lines.So this paper takes the parallel groove clamp as an example to carry out the study of the grid economic dispatching model which takes the thermal overload risk of overhead transmission lines into account.The research helps to improve the economy of power grid operation under the premise of ensuring the safety of transmission lines,and it has good theoretical significance and application value.The specific research contents are as follows:Firstly,the temperature model of overhead transmission line with parallel groove clamp is studied.In the research,an indoor experimental platform is designed and built.Under the conditions of different tightening torque,current and operating temperature,the AC resistance values are measured.The polynomial function fitting model and the BP neural network model are constructed by using the measurement results.And then they are compared with each other.On this basis,the axial micro-element thermal circuit model of overhead transmission lines with parallel groove clamp is proposed.Combined with experimental data,the unknown parameters in the thermal circuit model are identified comprehensively by using the genetic algorithm and interior point method.Compared with the measured results of the wire temperature shows that the maximum calculation error of the proposed heat circuit model is no more than 4%,which can accurately simulate the axial temperature dynamic distribution of overhead transmission lines parallel groove clamps,and provide a theoretical basis for the risk assessment of thermal overload.Secondly,based on Markov chain and Monte Carlo simulation method,the risk assessment method for overhead transmission lines and parallel groove clamp is proposed.In this study,an outdoor experimental platform is designed and built to carry out the outdoor temperature rise experiments on overhead conductors with parallel groove clamp under the different conditions of meteorological condition,clamping torque and current level.The risk of thermal overload of conductors and clamp under the current operating environment is evaluated and verified online.The experimental result shows that the proposed method can improve the security of dynamic operation of power lines and provide a basis for further improving the safety of power grid dispatch.Finally,based on the proposed thermal circuit model and risk assessment method,an economic dispatching model of power grid with the risk of thermal overload of parallel groove lamp is proposed.This model regards the risk of thermal overload as a constraint of dispatch,so it can improve the economy of power grid under the premise of ensuring the safety of line operation.The simulation result shows that the model is effective.