中文摘要：

针对光伏并网逆变器模型参数未知和外界干扰问题，文章运用自适应Backstepping与耗散性理论相结合的方法进行非线性控制器设计，文章设计的每个环节都符合耗散性要求，所得控制器既能保证闭环系统稳定，又具有一定的扰动抑制能力，同时自适应环节对未知参数进行实时估计。通过自控理论可知，文章的控制方法能保证系统内所有状态变量一致有界且渐近稳定：仿真结果表明，所设计的控制器能够增强系统的抗干扰能力．提高系统的鲁棒性。

英文摘要：

There are unknown parameters and uncertain outside interferences in PV grid-connected inverter model. To cope with this problem, a nonlinear controller is designed by employing a combina- tion of dissipation theory and adaptive Backstepping method in the article. Links in the control chain designed satisfy the dissipation requires, so the disturbances. And the adaptive part can estimate controller can render the system stable and restrain the uncertain parameters in real time. The theoretical proof shows that all state variables of the system are uniformly bounded and asymptotically stable; the simulation results show that controller can enhance anti-interference ability and improve robustness of the system.