考虑变桨驱动电机特性的风电机组运行性能仿真

Simulation on the operational performances of wind turbine generator system considering the variable pitch drive motor characteristics

为了更好地反映并网风电机组的动暂态运行特性,提出了考虑变桨系统的风力发电机组运行性能研究。在阐述变桨距控制原理的基础上,建立了以变频三相感应电动机作为驱动电机的变桨控制系统数学模型,并对其变桨距控制性能进行仿真。结合考虑变桨电机驱动特性的变桨系统控制模型,建立了并网笼型异步发电机组的动态数学模型。对额定风速以下和额定风速以上的并网异步风力发电机组动态运行性能进行仿真,并与不考虑变桨电机驱动特性时的机组运行性能进行比较。结果表明,建立的变桨控制系统能实现桨距角的准确控制;考虑变桨驱动电机特性的风电机组模型更能体现机组的动态特性,尤其是在额定风速以上情况。

In order to better reflect the dynamic and transient characteristics of a gird-connected wind turbine generator system （ WTGS ）, studies on the operational performances ofa WTGS considering the pitch control system are proposed. Firstly, based on the principle of variable pitch control, the mathematical model of the pitch control system is established by taking a variable-frequency three-phase induction motor as the drive motor, and its control performance of the pitch angle is simulated. Secondly, combining with the variable pitch control system models considering the features of pitch drive motor, the dynamic mathematical models of a grid-connected wind turbine with a squirrel cage induction generator （SCIG） are presented. Finally, the dynamic performance of the grid-connected wind turbine with SCIG is simulated when the wind speed is below and over the rated wind speed, respectively. The results are also compared with that of without considering the characteristics of the pitch drive motor. The compared results have shown that the presented pitch control system can achieve accurate control of pitch angle. Compared with a model without consideration of the pitch-drive motor, the grid-connected WTGS model considering the pitch-drive motor characteristics can more actually reflect the dynamic operating characteristics of a wind turbine system, especially in the condition of above the rated wind speed.