A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance.Therefore,the gr...A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance.Therefore,the grouping of the wind turbines in the wind farm determines the layout of the lines and affects the line impedance.The line structure and composition of the wind farm are analyzed,and the relationship between the impedance of the collection line and reactive power generated by the wind turbine at low-voltage ride through is derived.We conclude that the smaller the equivalent impedance of the wind farm collection line structure is,the greater the reactive power at the wind farm collection line point is.In addition,the economic aspect of the collection line needs to be considered in the design.The economic aspect and impedance values have contrasting characteristics.Therefore,according to the condition of minimum impedance and optimized economic aspect,an optimization model of a wind-farm collector-circuit structure is proposed.The optimal structure of the wind farm collector circuit is calculated using the Monte Carlo method,and the theoretical analysis is verified by simulation.展开更多
基金Supported by Natural Science Foundation of Hunan Province of China(2019JJ50119)Educational Commission of Hunan Province of China(18C0510)Zhuzhou City Science and Technology Plan(Zhu Ke Fa[2017]No.68)。
文摘A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance.Therefore,the grouping of the wind turbines in the wind farm determines the layout of the lines and affects the line impedance.The line structure and composition of the wind farm are analyzed,and the relationship between the impedance of the collection line and reactive power generated by the wind turbine at low-voltage ride through is derived.We conclude that the smaller the equivalent impedance of the wind farm collection line structure is,the greater the reactive power at the wind farm collection line point is.In addition,the economic aspect of the collection line needs to be considered in the design.The economic aspect and impedance values have contrasting characteristics.Therefore,according to the condition of minimum impedance and optimized economic aspect,an optimization model of a wind-farm collector-circuit structure is proposed.The optimal structure of the wind farm collector circuit is calculated using the Monte Carlo method,and the theoretical analysis is verified by simulation.
