Research On Efficient Method For The Calculation Of Power Frequency Electric Field In Power Transmission And Transformation Systems Based On Openmp

With the rapid development of electric power construction in our country,the voltage level has been continuously improved.And the society is increasingly concerned about the impact of the power frequency electric field in the power transmission and transformation system on the environment as the voltage level increases.In transmission and transformation systems,because of its ultra-high voltage,large number of relatively concentrated charged conductors and complex structures of these conductors,the rapid calculation of power frequency electric fields is very difficult.On the one hand,how to quickly and efficiently obtain the power frequency electric field distribution in the power transmission and transformation system is of great practical significance for the early design of the project and the prediction of the electric field;On the other hand,with the rapid development of computer technology,how to maximize the development of power grid construction with advanced computer technology to meet the increasingly large-scale complex electric field computing needs is one of the key researches in the current international power grid construction.At present,there are few researches on the fast solving of all kinds of complex power frequency electric field calculations in large-scale transmission and transformation systems.Focusing on this topic,this paper studies the parallel calculation of power frequency electric field in transmission and distribution systems based on the simulation charge method and OpenMP multi-core parallel programming model.The specific work is as follows:Firstly,deducing and discussing the calculation method of various charges in the electric field calculation in the simulation charge method,and then analyzing the development problems of OpenMP parallel computing process,including the sub-task granularity classification,process scheduling,and reducing load imbalance.Then analyzing the intrinsic parallel possibility of the charge simulation method.Combining the parallel design method(PCAM),based on the parallel computing framework of OpenMP,the charge simulation method and the parallel idea are combined to design a charge simulation method suitable for parallel computing.According to the difference of charge calculation methods in the charge simulation method,two parallel optimization methods are proposed,which are parallel charge distribution parallel algorithm and charge-differential split parallel algorithm.Corresponding models were established to verify the two parallel algorithms.The adaptive scenarios and corresponding influencing factors of the two parallel algorithms were discussed.The charge calculation speed ratio coefficient was proposed,which provided a criterion for the application of different parallel algorithms under different scenarios.The complex three-dimensional models of ultra-high voltage transmission lines with a building below,glass-type towers and 500 kV substations are established in the transmission and distribution system,and the two parallel methods are applied to their respective models.Analyze the speedup and parallel computational efficiency of the algorithm in different models.Calculations proves that,the algorithm achieves an acceleration ratio and parallel computing efficiency close to the ideal value;achieving load balance.And compared to the simulation calculation in Matlab alone,parallel computing greatly shortens the calculation time and achieves a good acceleration effect.For the complex power transmission system power frequency electric field numerical calculation provides an effective method for rapid solution.