Research On Reactive Power And Voltage Control Of Regional Power Grid Connected To New Energy Generation

With the increasingly prominent climate change and energy issues,the development and use of new energy have attracted more and more attention,and the technology of new energy generation and grid connection has also become a research hotspot.However,new energy power generation is seriously affected by weather changes,and its power generation output is intermittent and uncertain.The connection system is easy to cause grid bus voltage fluctuations.It brings certain challenges to the system reactive power and voltage stability after it is connected to the grid.If you want to suppress the voltage fluctuation problem after large-scale new energy power generation is connected to the power grid,improve the system voltage level and power quality,and reduce the active power loss of the network,you can optimize the reactive power compensation for the system according to the reactive power regulation characteristics of new energy power generation.,optimize the power flow distribution of the grid,so that the system can maintain safe and stable operation after the new energy power generation is connected.This thesis summarizes the grid-connected technology of new energy power generation,analyzes the impact of new energy power generation access on the power grid system,and takes the actual power grid as an example to conduct in-depth research on the reactive power compensation position and reactive power compensation device,and determine the reactive power optimization scheme.This thesis firstly compares the characteristics of commonly used reactive power compensation devices and comprehensively selects reactive power compensation devices based on the requirements of new energy power generation grid-connected and the simulation effect of reactive power compensation.Then,according to the sensitivity analysis method,different reactive power compensation location schemes are formulated,and PSD power flow simulation software is used to build a mathematical model of the regional power grid.Finally,according to the multi-objective requirements of the regional power grid,an evaluation index system of reactive power optimization scheme based on gray correlation degree and approaching ideal solution method is established,and six representative evaluations are selected from three aspects of system stability,safety and economic benefit.The index weight is determined by the subjective and objective comprehensive weighting method,the three reactive power optimization schemes are calculated by the grey correlation degree and the approaching ideal solution method,and the similarity of the geometric shape of the index sequence curve and the distance of the index sequence are comprehensively considered to make a decision and evaluation of the to-be-evaluated scheme,select the best reactive power optimization scheme.