风电机组控制系统稳定性分析

风电机组系统的稳定性直接涉及到整机性能、安全及寿命,是机组设计中必须考虑的内容之一。通过GH Bladed软件的模态线性化方法对风电机组进行分段线性化处理,在Matlab/Simulink中搭建风电机组控制算法的非线性仿真模型,然后分别采用阶跃响应、根轨迹、伯德图、Nyquist曲线对比分析开环控制和闭环控制系统的稳定性、闭环控制系统在无扰动和有扰动情况下的稳定性情况,并对某2 MW机组的控制系统进行稳定性分析,分析结果表明,系统是稳定的。对风电机组控制系统进行稳定性分析为风电机组设计如机组的安全性、可靠性、鲁棒性等问题提供一定的理论依据。

Stability analysis of a wind turbine control system

The stability of wind turbine is directly related to its overall performance, safety and lifetime, so it must be considered in the plant design. In our experiment, segmented linearization of the wind turbine is conducted by modulus linearization of GH Bladed software, on the basis of which a nonlinear simulation model of wind turbine control system is established in MATLAB/SIMULINK enviroment. Step response, root locus, Bode diagram and Nyquist curve are used in stability analysis of the open-loop controlsystem and closed-loop control system in disturbed and undisturbed enviroments. All analytical results show that the 2 MW control system is stable. It''s necessary to analyze the stability for the control system of wind turbine, which can provide a theoretical basis for the design of wind turbine ralating to such issues as security, reliability and robustness.