| With the rapid development of China's economy,the total GDP has leaped to the second place in the world.As the main energy source of China's economic development,people have higher and higher requirements for voltage quality.Reasonable reactive power allocation can not only reduce line loss and improve power supply capacity to ensure voltage quality,but also improve the stability of power grid,especially voltage stability.With the increasing load of distribution system,the demand for reactive power is also increasing.When the reactive power is unbalanced,there will be problems such as the reduction of system power factor and voltage,the decrease of power quality,and the increase of line loss.Therefore,reasonable reactive power distribution is an effective means to ensure the safe and stable operation of distribution system,which is of great significance to improve the quality of life of the people.Influenced by the investment strategy and geographical environment of power supply enterprises,there are single radiation power supply lines with long power supply radius in the distribution network.Because the line diameter is too small and the power supply radius is too long,the voltage drop is too large and low voltage appears at the end of the line in the process of power transmission.In view of the above phenomena,this paper first analyzes and discusses the relevant theories of the overhead distribution network and the series compensation device of the distribution network,and analyzes and summarizes the relevant research literature of the voltage quality at home and abroad at this stage,in order to find the effectiveness of the series compensation device in improving the voltage quality of the 10 k V overhead distribution network,reducing the line loss,reducing the voltage fluctuation rate,and at the same time summarizes the series compensation device Installation capacity and location of the device.Taking lianjiang power supply area of Zhanjiang as an example,this paper analyzes the current situation of its 10 k V distribution network and finds out the cause of low voltage at the end of the line.On this basis,the paper puts forward the technical measures to improve the voltage quality of 10 k V distribution network in Lianjiang District of Zhanjiang based on the fast switch type series compensation device.Taking 10 k V High Bridge line as the test line,the paper analyzes the promotion effect of different compensation positions and capacities of series compensation device on voltage quality,voltage fluctuation rate and line loss before and after the installation through PSASP integrated platform simulation.Based on this,the best installation scheme of 10 k V High Bridge line is obtained.Finally,based on the actual operation data of the voltage at the head of each distribution substation area at the end of the line after the implementation of the project,the improvement effect of the line voltage based on the fast switch type distribution network series compensation device is compared and analyzed.It can be seen that under the current operation mode,the fluctuation range of the voltage at the load end of 10 k V High Bridge line is controlled from above ± 20% to within ± 10% of the national standard GB / t12325.It effectively solves the problem of low terminal voltage of 10 k V High Bridge line.At the same time,in order to solve the problem of low voltage at the end of long power supply radius line in Lianjiang District of Zhanjiang,a solution with less investment,quick effect and convenient operation and maintenance is explored.Further improve the operation level of power distribution network of power supply enterprises and improve the quality of residential power consumption. |
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