Study On Power Quality Management Of The Complementary Of Agriculture,Fishery And Photovoltaic Plant

With the continuous development of photovoltaic power generation,the complementary of agriculture,fishery and photovoltaic plant which combines solar power generation,modern agriculture and poverty alleviation projects has become a hot topic in recent years.However,due to the complementary of agriculture,fishery and photovoltaic plant contains many kinds of non-linear equipments and converter devices,a large number of harmonics will be generated and injected into the public power grid during its operation.These harmonics will affect the safety,stability and economic operation of the power grid,and even interfere with the normal operation of other equipment.Therefore,in this paper,a complementary of agriculture,fishery and photovoltaic plant which using transformer integrated filtering method is introduced,which can solve the power quality problems of photovoltaic plant through two-stage filtering station.At the same time,a actual application project verifies that the introduced transformer integrated filtering method has a good performance on the power quality in the complementary of agriculture,fishery and photovoltaic plant.First,the research progress and development direction of photovoltaic power generation at home and abroad are introduced.In addition,the harmonic and fluctuation of photovoltaic plant and its impact on grid are briefly presented.At the same time,the research of existing measures to improve the power quality of photovoltaic plant are summarized.Secondly,considering the generation characteristics of the complementary of agriculture,fishery and photovoltaic plant and the impacts of its integration to the power grid,the power quality status and operation characteristics of which are studied.In addition,based on the power quality evaluation status of a complementary of agriculture,fishery and photovoltaic plant in central China,the necessity of power quality management in the complementary of agriculture,fishery and photovoltaic plant is concluded.Aiming at the existing problems,a complementary of agriculture,fishery and photovoltaic plant which using transformer integrated filtering method is introduced to solve the power quality problems of the photovoltaic plant.The topological structure of the complementary of agriculture,fishery and photovoltaic plant which using transformer integrated filtering method is given.Thirdly,the integrated filter theory of transformer is introduced in detail.The integrated filtering reactance box transformer and inductive filtering grid-connected transformer are investigated respectively.The coupling between the filter reactance windings and inductive filtering are emphatically studied,and the corresponding equivalent circuit and mathematical model are established.It is proved theoretically that the filtering reactor integrated box transformer can eliminate most of the harmonics of inverters and the installation space can be reduced.The inductive filtering method applied in the grid-connected transformer improves the power quality at the point of common coupling.Based on this,the main circuit wiring mode of the complementary of agriculture,fishery and photovoltaic grid-connected system which integrates two-stage filtering stations and applies the transformer integrated filtering method is presented.Finally,the power quality management performance of the complementary of agriculture,fishery and photovoltaic plant based on transformer filtering method is verified in a actual application project in Hunan Province.The practical scene of the complementary of agriculture,fishery and photovoltaic plant in Hunan Province which using filter theory integrated of transformer are given.With the help of the HIOKI power quality analyzer PW-3198,several power quality indicators are continuously monitored.From the perspective of Probability and Statistics,the power quality characteristics of the complementary of agriculture,fishery and photovoltaic plant which using integrated filtering method are studied,and the power quality characteristics and management performance of the complementary of agriculture,fishery and photovoltaic plant integrated filtering method are demonstrated by the analyzing harmonic voltage,voltage fluctuation and flicker,harmonic current analysis and so on through MATLAB software.