基于负荷安全域的双馈风电场无功配置及规划

为了应对风电接入电网引起的电压安全稳定问题,提高风电场并网点电压稳定性,从规划角度考虑,提出一种基于负荷安全域计算双馈风电场无功配置以及场内集电线路选型的方法。首先研究推导风电机组机端P—Q特性曲线,得到双馈风电机组稳定运行域。接着分析了机组P—Q特性曲线和集电线路首端安全域边界配合问题,以此确定集电线路型号,达到充分利用风电机组无功能力目的。最后通过并网点的安全域边界计算风电场无功配置容量。算例结果表明,所提出的无功配置方法能保证并网点电压在安全范围内。

Reactive power configuration and planning of doubly-fed wind farm based on load security domain

The problem of voltage safety and stability might occur when the wind power is connected to the power grid.In order to improve the voltage stability of the wind fartm's grid connection point,this paper proposes a reactive configuration of the doubly-fed wind farms on the basis of the calculation of load's safe domain.In addition,a collector line selection method is also proposed.Firstly,the P-Q characteristic curve of the wind turbine unit is derived,and the stable operation domain of the doubly fed wind turbine is obtained.Then,the P-Q characteristic curve and the boundary coordination problem of the safety end of collector line are analyzed to determine the collector line type,so as to fully utilize the non-functionality of the wind turbine.Finally,the reactive power allocation capacity of the wind farm is calculated through the security domain boundary of the grid connection point.The results of the example show that the proposed reactive power configuration method can ensure the grid voltage within the safe range.