电网电压不平衡下变速恒频双馈感应电机的自适应控制

摘要

着重研究双馈感应电机在电网电压不平衡条件下的不间断运行控制问题.利用对称分量法将三相不对称向量分解成正序、负序、零序分量给出的电网电压不平衡情况下的双馈感应电机数学模型,使用非线性自适应控制技术综合设计了电机转子电压的鲁棒自适应控制器.理论分析和仿真研究表明,即使在系统参数和外部干扰存在的情况下,设计的控制器仍可以保证:系统安全可靠的运行、最大风能跟踪、输出恒压恒频的电流以及电网电压不平衡情况下的电机不间断运行.%This paper focuses on research on the control strategy of uninterrupted operation of the DFIG under the unbalanced grid voltage. The generation system is mathematically modeled by using the symmetric-component method, which decomposes the three-phase asymmetric vector into positive,negative,zero sequence components. The rotor-side voltage controller is designed integrally by utilizing nonlinear adaptive control technology. The theoretical analysis and the simulation show that under uncertain parameters and the external disturbances, the proposed controller guarantees that the wind power system achieves the maximal absorption of wind power, constant voltage constant frequency output, and uninterrupted operation of generators.