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Typhoon disaster can result in wind farms shutdown. With the large-scale integration of wind farms in power system, the wind farms shutdown may affect the operation of power system, causing the power shortage and voltage violation. In this paper, a shutdown risk assessment method is proposed to evaluate the risk of wind farms operation under typhoon disaster. Firstly, the distribution of forecast error of wind power under typhoon conditions is analyzed according to the historical data and is established as T distribution. Next, the real-time shutdown probability of wind farms is generated by the known cumulative error distribution. Then, the shutdown cost of wind farms are expressed by the cost of shedding load after wind power exiting, which is solved by particle swarm optimization method. Finally, the adjusted IEEE-33 node system with wind farms are adopted to verify the effectiveness of proposed method.

The battery energy storage system (BESS) is developing from the demonstration project to the stage of business promotion Due to the unsound Economic benefit evaluation, which restricts the large-scale promotion and construction of BESS. This paper establishes the life cycle cost and income model of BESS and uses the dynamic investment payback period, net present value (NPV), internal rate of return (IRR) and other economic indicators to analyze the economy of offshore wind power with BESS in reducing forecast deviation penalty. At the same time, aiming at stimulating the enthusiasm of the wind farm to allocate energy storage, we studied the improvement of the penalty rules of wind power forecast deviation. The research results can provide an engineering economic reference for the investment decision of BESS.

In order to analyze interaction between wind farm and electric power system, research transient voltage characteristics of large-scale wind farm in system fault and after fault, and realize large-scale wind farm fault ride through, it is necessary to build wind turbine modeling suitable for large electric power system simulating calculation program. Various power system simulators are used in many research institutes and power operators home and abroad, and there are different processing methods for wind turbines and wind farms modeling designed for different research purposes, as well as different running characteristics with different wind turbine manufacturers and technical specifications, so whole process simulation under multiple working conditions shall be realized by carrying out corresponding work. Based on basic theory of wind power generation, this paper analyzes structure and characteristics of double fed induction generator (DFIG), researches models of its mechanical system, electric system and other main constituents, and gives basic requirements and characteristic simulation of wind turbine modeling with transient response characteristics under multiple working conditions.