传统的开关型正弦电压源采用的是 PWM技术与 PID控制相结合的方法 ,它是对参考正弦信号的跟踪控制 ,鲁棒性较差。本文针对这类开关型的正弦电压源 ,使用变结构控制策略 ,提高了正弦电压源对负载的鲁棒性和对自身参数摄动的抗干扰性。同时 ,由于直接使用状态变量作为反馈量 ,无需参考信号。在变结构控制思想中 ,抛弃了经典的线性切换面 ,使用一种椭圆形的非线性切换面 ,并推导了相应的控制律和切换面的到达条件。仿真结果证实了理论的正确性 ,同时还表明 ,该方法除具有较好的鲁棒性能外 ,快速性也较好。简单的结构和相当小的计算量使该方法应用前景看好 The traditional switched-mode sinusoidal voltage source uses a combination of PWM technology and PID control. It is a tracking control of the reference sinusoidal signal with poor robustness. In order to improve the robustness of the sinusoidal voltage source to load and the anti-jamming of its own parameter perturbation, a variable structure control strategy is proposed in this paper. At the same time, no reference signal is required because of the direct use of state variables as feedback. In the idea of ​​variable structure control, the classical linear switching surfaces are discarded, an oval nonlinear switching surface is used, and the corresponding control law and switching surface arrival conditions are deduced. The simulation results confirm the correctness of the theory. At the same time, it also shows that this method not only has better robustness, but also has better speediness. The simple structure and the relatively small amount of calculation make the method promising