Research On Optimal Operation Management Of Tongliao Grid Considering Photovoltaic Station Connected Impact

Tongliao is located in the east of the Nei Monggol Autonomous Region with obvious regional advantages of abundant solar energy resources and possesses dominant development conditions. During the period of the "12th Five-Year Plan", the government issues related policies of distributed energy. Photovoltaic power generation is developed rapidly and presents explosive growth trend, owing to the "8337" development idea in municipality. Seven photovoltaic power stations have been invested in Tongliao until May 2015. The installed gross capacity has reached 300000 kilowatts. Types of the photovoltaic power station are extremely complicated. The control, delivery and absorption of photovoltaic stations have profound influences on power grid stable operation and bring huge challenges to grid security.With the explosive development of photovoltaic stations, to ensure the sustainable development, common benefits of power generation enterprises and local governments, and better serve for local economic development, it is inevitable to do photovoltaic grid-connected management study.First of all, the paper analyzes dynamic mathematical modeling of photovoltaic grid-connected power stations and stability of grid-connected power stations, then further considers the influences of maximum power tracing control on system stability, and proposes stability criteria on photovoltaic power stations. In addition, this paper analyses the key management evaluation factors of the Tongliao grid’s photovoltaic stations, and constructs three levels of evaluation index system, including management performance index, economic benefits index and social benefits index. This paper analyses the main meanings of each index and puts forward the management index system model based on Delphi method and collaborative analytic hierarchy process.Secondly, this paper analyzes Tongliao power grid status, load prediction, and photovoltaic power stations through field research. Meanwhile, this paper carries out stability analysis after photovoltaic stations get accessed with Tongliao power grid, and take the photovoltaic station in Holingole as example. The paper defines the system scheme of Tongliao Jarud Banner20MW photovoltaic project accessing to the Holingole, local load prediction and electric power balance. Based on the foundation of tide calculation, the paper conducts overload analysis, synchronous stability analysis, voltage stability analysis and mutual influence analysis of photovoltaic power stations and the power grid. Based on that, this paper analyses the Tongliao grid’s photovoltaic power station management based on Delphi method and collaborative analytic hierarchy process, and summarizes 10 main components from 27 indicators. Then, the comprehensive benefits of management, economic development and social of the Tongliao grid’s photovoltaic power station project can be concluded. And the paper proposes optimal management strategies of photovoltaic grid-connected stations, including planning management, generation scheduling management, grid-connected operational technical requirements, operational dispatching management, engineering construction management and construction of operation and supervision, etc. Meanwhile, in order to solve core problems of impacting system safety, stability and economic operation and the construction and access of Tongliao photovoltaic power stations in the future, the paper proposes some specific recommendations, including photovoltaic grid-connected power station management process, exit management, construction of detailed access figures of photovoltaic stations, and critical technological study on grid connection.