Study On Optimization Of Distribution Network Compensation Based On Energy Efficiency Analysis

The Series compensation technology provides an effective means to solve the low voltage problem of distribution lines with long supply radius,heavy load,and especially load concentration at the end of the line with its good "adaptive" nature.However,in the process of popularization and application,the problem of determining the distribution point and capacity of the series compensation device needs to be optimized,and the difference in the installation position of the device will have a greater impact on the selection of the compensation effect and the compensation capacity.In this paper,based on the typical low-voltage end of the distribution network line,including the voltage fluctuation of the distributed power line,a programmatic determination method of series compensation position and capacity based on energy efficiency analysis is adopted.On the basis of power flow calculation,an energy-saving evaluation model that satisfies both voltage quality and maximum transmission power is established.With the goal of maximizing energy conservation through series compensation,the optimal value of the series compensation degree is found,and the effect of improving voltage quality is achieved with relatively small inputs.The voltage of each node of the target distribution line is raised to the required range of the national power grid.Under the maximum load condition,the active loss of the main line and the branch line of the target distribution line is effectively reduced.According to the energy efficiency analysis method of series compensation,this article has developed a series of compensation energy efficiency analysis software for distribution network based on Matlab platform.It selects the first unqualified node,first end node,or heavy load nearby node on the dry road as the installation point of the undetermined compensation device.A series compensation optimization model is established to determine the compensation degree corresponding to the undetermined compensation position,and the improvement rate of its energy saving and transmission capacity is calculated,and the comprehensive energy efficiency of each compensation scheme is compared to determine the optimal scheme.Perform a series-complementary application analysis on a typical line,calculate a series-compensation scheme based on PSASP software,and determine the optimal string compensation point and capacity plan based on the general principles of voltage quality and network loss;then use energy efficiency analysis software.Several nodes are selected as the point of the undetermined compensation device,and the comprehensive energy efficiency of different points is analyzed and compared to obtain the optimal solution.The comparison results of the two schemes are basically consistent,which proves the correctness and feasibility of the energy efficiency analysis method for series compensation.Then apply the method to a line with distributed power supply,and mainly apply to the line containing small hydropower lines and photovoltaic power supply,establish a model,effectively find the position and capacity of series compensation,and solve the line voltage problem.The application of typical cases shows that the series compensation energy efficiency analysis method can effectively optimize the distribution network series compensation and find the optimal compensation position and compensation capacity of the line.It can not only make the voltage of each node meet the national standard,but also can achieve the greatest reduction energy saving and improvement.Line transmission capacity effect.And the successful application of distributed power network also proves that this method has a wider application space and has strong feasibility and practicality.