风电机组电动变桨系统建模及运行特性评估与测试

Modeling and Operation Performance Evaluation and Test of Electric Pitch System in Wind Turbine Generator System

为了较好地反映风电机组电动变桨系统的动暂态运行特性,有必要研究考虑电机驱动特性的电动变桨系统的动态模型。在介绍电动变桨系统基本结构和原理的基础上,建立了包含感应电机及其矢量控制策略、减速齿轮箱传动系统及后备电源各子系统模型的电动变桨系统详细模型,并给出了变桨控制系统简化一阶惯性环节模型;为了验证所建立的详细模型的有效性,搭建了电动变桨系统的测试平台,对所建立的变桨系统详细模型进行了桨距角跟踪性能、负载扰动运行特性和低电压故障运行特性仿真,并将其与简化一阶惯性环节模型和实际测试系统的结果进行了比较。结果显示,所建立的详细模型能够更好地反映实际电动变桨系统的动暂态运行特性,且能较好地评估其低电压故障运行特性。

To better understand the dynamic characteristics of electric pitch system in a wind turbine generator system（WTGS）,it is necessary to study its dynamic model with consideration of drive motor characteristics.By introducing the basic principle of the electric pitch system,its detailed models are presented.The model includes the subsystem models of three-phase induction motor and its vector-control strategy,driver train,back-up battery.A simplified first-order inertia model for the electric pitch system is also introduced.In order to validate the detailed model,a test platform for the electric pitch system is constructed.And additionally,the dynamic performances of the detailed model,including the pitch angle tracking performances,the load disturbance performances,and the low voltage fault performances,are simulated.The simulation results are also compared with those of the simplified first-order inertia model and those of the test platform for the electric pitch system.The comparison shows that the proposed model can better reflect the transients of a real electric pitch system,and can also be used to evaluate the operation characteristics of a real electric pitch system under low voltage faults.