This paper proposes an advanced fault ride-through strategy using feedback linearization (FL) and sliding mode control (SMC) for squirrel-cage induction generator (SCIG)-based wind energy conversion systems (WECSs). Based on FL theory, a nonlinear dynamic model of a SCIG wind turbine system is linearized with only two decoupled state variables: d-axis stator current and DC-link voltage. Thus, d-axis stator current and DC-link voltage controllers can be simply designed with the linear control theory. Moreover, with the proposed FL control law, the DC-link voltage control can be performed by directly regulating the q-axis stator voltage without a q-axis current controller. During grid voltage sags, the output power of the SCIG is reduced to maintain the DC-link voltage. By applying SMC theory to the design of d-axis stator current and DC-link voltage controllers, robust performance of control systems can be achieved even under parameter variations. The feasibility of the proposed method has been demonstrated via simulation and experimental results.

本文针对基于鼠笼式感应发电机（SCIG）的风能转换系统（WECS），提出了一种使用反馈线性化（FL）和滑模控制（SMC）的高级故障穿越策略。基于FL理论，仅使用两个解耦的状态变量（d轴定子电流和直流母线电压）将SCIG风力涡轮机系统的非线性动力学模型线性化。因此，可以使用线性控制原理简单地设计d轴定子电流和直流母线电压控制器。此外，利用提出的FL控制律，可以通过直接调节q轴定子电压而无需q来执行直流母线电压控制轴电流控制器。在电网电压下降期间，SCIG的输出功率会降低，以维持直流母线电压。通过将SMC理论应用于d轴定子电流和直流母线电压控制器的设计，即使在参数变化的情况下，也可以实现控制系统的鲁棒性能。仿真和实验结果证明了该方法的可行性。