Study On Frequency And Voltage Stability Of Photovoltaic Solar Access Distribution Network In Huanggang Region

With the global energy resources shortage and environmental pollution becoming more and more serious,solar energy,as a clean and environmentally friendly renewable resource,has been recognized and valued by all countries in the world for its development and utilization.The abundant solar energy resources have spawned the vigorous development of the photovoltaic industry,resulting in the rapid growth of photovoltaic power generation based on distributed photovoltaic power plants.At the same time,the integration of photovoltaic power into the conventional distribution network has gradually attracted the attention of all parties.For grid companies,conventional grid-connected operations can cause a series of effects such as power integration and grid maintenance.In this paper,the voltage level,voltage distribution,voltage attenuation and stability of the distribution network under the steady state of photovoltaic power generation are studied.In order to explore the power quality problems brought by grid-connected photovoltaic power generation,the 10 k V and 0.4k V residential distribution network in Huanggang area is taken as an example to simulate the power quality characteristics of photovoltaic power generation grid-connected steady state,and the power is qualitatively analyzed by power flow calculation.The trend of quality changes.With the help of simulation and power flow calculation tools such as PSCAD/EMTDC and MATPOWER,the results show that photovoltaic power generation is connected to the grid by comparing the voltage changes before and after grid-connected photovoltaic power generation and the integration of power quality of distribution systems with photovoltaic systems with different permeability.It usually causes the voltage distribution and voltage level of the distribution network to rise,and also causes the voltage drop attenuation and loss reduction,and the voltage stability of the distribution network is enhanced.In addition,with the increase of photovoltaic power generation permeability,the voltage level,voltage attenuation and voltage stability of the distribution network exhibit the same characteristics,and the increase of the permeability at high load demand causes the voltage distribution curve of the busbar and the entire grid.More flat.From the perspective of steady-state voltage stability,the results show that the grid-connected photovoltaic power has improved the stability and stability of the grid,which is reflected in the decrease of the bus sensitivity value and the increase of the grid storage characteristic value.Combined with the above experimental analysis,the distribution network has a limit value for the acceptance capability of the photovoltaic power generation system.Taking the Huanggang area as an example,when the distribution network reaches the maximum acceptance capacity,the penetration rate of the photovoltaic power generation system is about 30%.Based on the above conclusions,the grid company can be guided to plan and implement the integration of solar photovoltaic power generation to determine the operational range of the normal steady state system.