含双馈型风电场的电网小干扰稳定性分析

Small Signal Stability Analysis with Doubly-fed Type Wind Farm System

为了研究风电场接入对电力系统的小干扰稳定性的影响,首先建立了风力机部分和发电机部分的数学模型,利用傅里叶变换对其数学模型进行线性化处理得到状态方程。在DIgSILENT/Power Factory仿真分析软件中,利用标准三机九节点系统作为测试系统进行如下研究:通过逐渐增大接入系统的风电场的有功出力研究了阻尼比变化趋势;双馈感应风力发电机组具有无功控制能力,并且风电场无功控制是未来发展需要的,所以也对阻尼比随无功出力的变化趋势做出了研究。两种研究方案说明了双馈型风电场接入系统后会使原有系统的部分振荡模态的阻尼比急速降低,但其值仍符合电网小干扰稳定性要求。

In order to study wind farm access to power system small signal stability, the wind machine parts and generator part of the mathematical model are established at first, and then using the Fourier transform gets the linearized mathematics model. Based on the DIgSILENT/Power Factory simulation analysis software using standard three-machine nine-node system as a test system, studied by gradually increasing the active power output of the wind farm damping ratio trend. Because doubly fed induction Wind turbine with a reactive power control capability, and future development needs to be applied to its reactive power control capability, the damping ratio with the reactive power output trend is studied. The two kinds of research approach illustrates doubly-fed type wind power access system can make the original system part of the oscillation modal damping ratio to reduce rapidly, but its value is still accord with grid small signal stability requirements.