Research On Power Supply Model And Distribution Network Planning Algorithm Including Decentralised Generation

As a final connection between power generation and electricity, distribution network bear great responsibility and risk. Not only it should ensure the reliability of operation, but also confirm the construction expense and operation cost. Along with the development of modern society, the energy consumption is increasing. But the original distribution network can not meet the requirements. As we consumed more original energy, our earth has become warmer and the environment has become worse. The effective use of the new distributed energy will do benefit to our earth.Through the search algorithm based on the improved greedy search algorithm to determine the distributed new energy access location in distribution network. If we connected the distributed new energy with the distribution network correctly, it will bring many benefits. Firstly, it can effectively alleviate the electricity load. Secondly speaking, it can improve the distribution network losses and the voltage quality.However, if we can not connect distributed new energy with the distribution network correctly, it may cause voltage disturbance, load flow change and some other issues. What is more, we need prevent distributed new energy operate in island, as well as the disturbances to distribution network’s power quality.In this paper, specific work is as follows:Disturbance and security problems in the new energy access for distribution network this paper presents a new distributed energy grid strategy, for the purpose of preventing distributed new energy into the island operation mode, to improve the distribution network power factor operation. And for two different situation, low voltage distribution network and high voltage distribution network, different schemes is given.When new energy access to distribution network, it may cause load flow problem, in order to have a more clear understanding of distribution network power flow calculation, we first briefly analyzed the common power supply mode of distribution network. Then analyzed the mainly several kinds of distribution network power flow calculation algorithm. Traditional distribution network nodes in general are for PV nodes, when distributed new energy access to distribution network, a new node in the system type, PI nodes, P-Q (V) node, etc. Based on this, especially studied distribution network flow algorithm with distributed new energy is put forward.Distributed new energy access to distribution network in different position will have different effect on the distribution network, only the correct access location in distribution network be selected can improve the distribution network loss, improve voltage quality.Each distributed new energy has its own scope of supply, in determining the best position of distributed new energy, according to the distribution network branch of the original trend direction, define the positive trend of the value and the right to reverse trend values, based on this, advances the greedy search algorithm based on the improvement of the power supply range, to solve new energy access location problem in distribution network. Finally, an example simulation by IEE 13 node by the greedy search algorithm based on the improvement of the power supply range obtained distributed access position of the new energy, not only can improve the distribution network loss, but also can improve the voltage quality to verify the effectiveness of the proposed algorithm.