中文摘要：

当采用双馈感应发电机（doubly-fed induction generator,DFIG）的风电机组加入附加桨距角控制环节后,其将具备一定的功率备用以有效响应系统频率的变化,从而可使DFIG风电场表现出一定的静态特性。以往研究静态特性主要采用单机无穷大系统,系统频率对机组有功输出的影响、系统电压对机组无功输出的影响是单独分析的。实际风电场并网点的电压和频率常常是联动变化的,且实际风电场由数十甚至数百台机组连接而成,风电场的有功、无功输出与系统频率和电压的变化都相关。基于此,通过仿真研究了附加桨距角控制下DFIG风电场的综合静态特性,结果表明其应该描述为有功–电压–频率和无功–电压–频率三维特性。研究还表明,当风电场有功出力不变时,风电场内风速的随机分布不会显著影响风电场的整体静态特性。最后,对比了3种用以描述风电场三维综合静态特性的模型方程,结果表明标准多项式模型更为准确。

英文摘要：

A DFIG（doubly-fed induction generator） based wind turbine generator will have the ability to regulate its output power in response of the frequency change of the power system when adopting an additional pitch angle control which can keep some standby power for the DFIG. Thus, a DFIG based wind farm will show some static characteristics. It is usual to divide the static characteristics into active power-frequency and reactive power-voltage characteristics. And they are separately studied in a single-machine infinite-bus system generally. But a large wind farm consists of hundreds of wind turbines, its terminal voltage and frequency cannot be adjusted independently when it is connected to a power system. Therefore, this paper studies the synthesized static characteristics of the DFIG based wind farm with additional pitch angle control in a multi-machine power system by simulation. The results show that the static characteristics should be represented with 3D characteristics of active power-voltage-frequency and reactive power-voltage-frequency. The results also show that the stochastic distribution of wind inside a wind farm will not affect the static characteristics remarkably when the output power of wind farm keeps constant. Finally, three types of models adopted for representing the 3D characteristics are compared and the standard polynomial model is found most suitable.