Research On Reactive Power Compensation Strategy Of High Permeability Photovoltaic Distribution Network

According to the 14th Five-Year Plan to achieve the carbon peak by 2030 and the carbon neutral target by 2060,it is imperative to increase the proportion of new energy grids represented by photovoltaics.Increasing the ratio of photovoltaic grids can further reduce dependence on fossil fuels,reduce environmental pollution,and promote the development of related industries.However,with the continuous increase of distributed photovoltaic grid connection and the increasing penetration rate,its impact on the power system should also not be underestimated.In this paper,for the high-permeability photovoltaic distribution network,the reactive power compensation device is used to design the corresponding reactive power dynamic compensation strategy,and the simulation verification is carried out through the photovoltaic project example to verify its effectiveness.The main content of this article is as follows:First,the basic composition principle and working characteristics of the photovoltaic power generation system are introduced,and the impact of photovoltaic grid connection on the power grid is analyzed,and its impact on the voltage fluctuation problem is analyzed emphatically.Using Matlab/Simulink simulation software to establish an IEEE 33-node distribution network model,analyze the voltage distribution of the distribution network under different occasions,and intuitively reflect the problem of serious over-limit voltage under the high-permeability photovoltaic distribution network.Secondly,the different reactive power compensation equipment is summarized and discussed,the advantages and disadvantages of different equipment are analyzed,and the static var generator is selected as the reactive power compensation device in this article.On the basis of determining the reactive power compensation device,it is discussed how to determine the appropriate grid-connected node and capacity of the reactive power compensation device in the distribution system to effectively reduce the cost and network loss and improve the power quality.Based on the establishment of the reactive power compensation device site selection and volumetric model,the corresponding particle swarm algorithm is designed to solve it safely.At the same time,a reactive power dynamic compensation strategy based on model predictive control is established,which can effectively deal with the problem of voltage fluctuations under high-permeability photovoltaic distribution networks.Finally,taking Henan Yuzhou distributed photovoltaic project as a case study,there are a large number of distributed photovoltaic power stations in Yuzhou area,and at the same time,due to the support of photovoltaic poverty alleviation policies,it is bound to cause a high penetration rate of photovoltaics.First,the Yuzhou 10kV distribution network is modeled based on real data,and the voltage distribution after photovoltaic grid-connected is simulated to verify the serious impact of the voltage fluctuation problem.Take this as a background to optimize reactive power.First,determine the location and capacity of the reactive power compensation device,and then build a Simulink simulation model.Use the designed model-based predictive control reactive power dynamic model to determine the reactive power compensation amount of the reactive power compensation device,and finally verify the validity of the model.The construction of distributed photovoltaic power stations and rural poverty alleviation have positive guiding significance.