Research On Static Voltage Stability Of Distribution Network Considering Distributed Generation

With the rapid development of society,traditional fossil energy mining has not been able to fully meet the people's increasing needs for a better life.As a renewable,low-pollution,and sustainable new energy type,its development and utilization has gradually been affected by society.Attention and development.distributed generation,as a main utilization object of clean energy,can be directly connected to user-side power generation equipment.It has the advantages of flexible access methods,low environmental pollution,diverse energy sources,and high system reliability.Although distributed generation has many advantages,due to its strong dependence on the external environment,its output has a certain degree of randomness and volatility.After the power grid is connected,it will have many adverse effects on system stability.After the distributed generation is connected,the original power grid structure is changed,the number of power points is increased,and the system flow is also changed,which causes it to have a greater impact on the static voltage stability of each node in the power system.This paper mainly studies the influence of distributed generation on the static voltage stability after it is connected to the distribution network,and proposes corresponding solutions to its adverse effects.This paper introduces the development status and main research issues of distributed generation sources at home and abroad,and takes the impact of distributed generation access on the static voltage stability of distribution networks as the research object.The distributed generation is described,and the generator theory,technical characteristics and grid connection methods of four typical distributed generation are analyzed.PQ-type power node distributed generation is selected as the simulation object.At the same time,the influence of distributed generation on the power system power flow and static voltage stability is analyzed through mathematical derivation.In this paper,PSASP simulation software is used to establish a radial distribution network grid-connected model and a distributed generation distribution networkgrid-connected model with distributed generation sources.The voltage distribution and load margin are used as indicators.The simulation results of accessing distributed generation sources under different conditions are compared with each other,and the effects of different access methods,access locations,and access penetration rates on the static voltage stability of each node in the distribution network system are studied.The simulation results show that adopting the centralized access method,selecting the node with the lower voltage as the access position,and selecting the access capacity with high penetration rate are all conducive to the improvement of the static voltage stability of the distribution network.Under the same distributed generation source connection condition,the improvement effect of the static voltage stability of the ring-shaped distribution network is better than that of the radial distribution network.Aiming at the problem of voltage over-limit that may be caused by the access of distributed generation sources,it is proposed to solve the problems by means of distributed generation access regulation and reactive power regulation,so as to realize the safety and stability of static voltage of the distribution network.