双馈风电机组的建模仿真及其等值方法研究

摘要:

分析了双馈风力发电机组的数学模型及控制模型，基于PSCAD/EMTDC 仿真平台搭建了双馈风力发电机组 仿真模型，以阵风和渐变风为例，对风力发电机组并网运行端口的稳态特性和故障特性做了仿真，能够实现定子侧有 功、无功解耦控制及电压的恒定，验证了所建模型的正确性。在考虑尾流效应的情况下，研究了不同类型的双馈风电 机组等值思路，搭建了等值模型，对其等值前后的稳态、暂态特性进行对比分析，结果表明了该等值方法的有效性，为 大规模并网型双馈机组风电场进一步研究提供了有力条件。

Abstract:

The mathematical model and control model of double － fed wind turbine are analyzed． Based on PSCAD/EMTDC platform，a single double － fed wind turbine simulation model is built． Taking the gusty wind and gradient wind for example， the steady － state characteristics and failure characteristics of the wind turbine integrated to power grid are simulated，and the active and reactive decoupling control and constant voltage in stator side can be achieved，then，the correctness of the model is verified． The equivalent method of different types of double － fed wind turbine is studied considering the wake effect，an equivalent model is built，and the steady － state and transient characteristics are compared and analyzed before and after the equivalents． The effectiveness of the equivalent methods is verified by the results，which provides the favorable conditions for the further research of large － scale grid － connected wind farm．