| With the progress of society and economic development,people’s demand for electricity continues to grow,but the reliance on traditional primary energy generation has led to increasing energy shortages and environmental pollution problems,so there is an urgent need for a new type of power generation combined with traditional power generation to alleviate these problems.As a new type of clean,environmentally friendly power generation,many scholars have done some research in recent years on the operation of distributed power sources in conjunction with traditional power grids.In this paper,the tide calculation of distribution grids containing distributed power supplies and the optimal configuration of distributed power supplies connected to distribution grids are studied on the basis of considering the timing of distributed power supplies and loads,with the main research contents as follows:Firstly,the generation principles of four common types of distributed power sources and their handling of grid-connected nodes are introduced,and the impact of distributed power source access on the distribution network is analysed.By introducing two steps in the estimation and correction of the Jacobi matrix,and solving the problem of sensitivity to initial values with the forward back substitution method,the improved Newton’s method can be applied to the tide calculation of distribution networks with distributed power supplies while also enhancing the accuracy and speed of the calculation.The IEEE 33-node distribution system is used as an example to verify the correctness,superiority and applicability of the improved Newton’s method in calculating the tidal currents of distribution networks with distributed power sources.Secondly,for the optimal solution of the distributed power supply optimal allocation problem,the Harris Hawk algorithm is selected and some improvements are made to address the shortcomings of the algorithm in solving the distributed power supply optimal allocation problem.Tent chaotic mapping is introduced to improve the problem of initial population randomness,the roundup mechanism of the whale algorithm is introduced in order to enhance the search accuracy of the algorithm,and the t-distribution strategy is used to enhance the global optimisation seeking ability and solution speed of the algorithm.The t-distribution strategy is also used to enhance the global search capability and solution speed of the algorithm.The experimental results show that the improved Harris Hawk algorithm has better convergence accuracy and convergence speed,as well as better development capability.Finally,a mathematical model with network loss,node voltage deviation and comprehensive cost of distributed power investment as the objective function is established based on the consideration of distributed power and load timing,and a hierarchical analysis method is used to convert the multi-objective function into a single objective function in order to facilitate the solution.The IEEE 33-node distribution network system is used as an example,and the improved Newton’s tide calculation and the improved Harris Hawk algorithm are used to simulate the optimal configuration of the distributed power supply in the example.The results of this study show that the improved algorithm can effectively reduce the network losses and voltage deviations of the system,and improve the stability and economy of the system. |
