Impact Of Distributed Generation On Utilization Rate Of Electrical Equipment In Distribution Network And Analysis Of Integration Capacity

Power system requires huge asset investment and consumes a large amount of energy.As the energy-saving and emission reduction is more and more important,improving the use level of distribution network equipment is helpful to improve the economic performance of electrical enterprise and promote sustainable development.Distribution network which is the link of power system facing end users directly is the key infrastructure to make the regional economy develop continuously and improve people's living standard.Compared with developed countries,the use level of distribution network equipment in China is under-developed.The problem of low utilization rate is especially outstanding.Distributed generation(DG)may further reduce the utilization rate of distribution network equipment,on the one hand,the power generated by DG may be transmitted from low-voltage power grid to high-voltage on the other,causing adverse impacts on power grid.Aim at above problems,this article mainly includes the following contents:(1)The impacts of DG on utilization rate of distribution network equipment are quantified.The reasons of DG affecting the utilization rate of distribution network equipment are analyzed comprehensively from the biggest load time and average load level.The impacts of DG on utilization rate of distribution network equipment are quantified combining evaluation indexes of the utilization rate of distribution network equipment.(2)Application suggestion of new types of energy saving transformers are put forward as DG accesses to distribution network.No-load loss,load loss and economic load rate of different transformers are compared.Combined with the impacts of DG on the distribution network equipment load ability,application suggestion of new types of energy saving transformers are put forward.(3)Technological means such as using the complementarity between DG and loads,DG and DG,load and load are put forward to improve the utilization rate of distribution network equipment.The indexes for calculating the match of DG and loads,the complementarity of DG and DG are proposed.By improving the match of DG and loads,using the complementarity of DG and DG,using high-energy loads to adjust the network load characteristic,the utilization rate of distribution network equipment will be improved.(4)A mathematical model of maximum integration capacity of DG is built considering reverse power constraint.As DG accesses to distribution network,the power may be transmitted from low-voltage power grid to high-voltage,causing adverse impacts on power grid.A mathematical model of maximum integration capacity of DG is built considering reverse power constraint,and the calculation method is introduced.Considering the impacts of holidays on loads,the proposal of adjusting reverse power constraint to increase DG integration capacity is proposed.In this paper,the impacts of DG on utilization rate of distribution network equipment and DG integration capacity are researched.In the means of improving the utilization rate of distribution network equipment,improving the match of DG and loads,and using high-energy loads to adjust the network load characteristic improve predominantly the load factor.Using the complementarity of DG and DG improves the load rate.Total integration capacity of DG in a power supply area can be calculated by the model of DG maximum integration capacity.