自同步型并网逆变器有限时间全阶终端滑模控制研究

Research on finite-time full-order sliding mode control of self-synchronous grid-connected inverter

中文关键词  自同步  并网逆变器  有限时间控制  全阶终端滑模控制

英文关键词  self-synchronization  grid connected inverter  finite-time control  full-order terminal sliding mode control

中文摘要

      由于单台逆变器从离网到并网的切换过程中电网侧信息的获取会延迟, 使得经典的虚拟阻抗方法难以实现逆变器自同步电网信息的功能. 因此, 文中设计一种基于有限时间全阶滑模控制的直流母线电压/无功功率控制器, 该控制器与PQ型控制器相比减少了复杂的锁相环(PLL)结构, 与虚拟同步发电机(VSG)控制技术相比增加了电网侧频率信息的采样, 可实现对对电网信息的自同步追踪, 并且有限时间的全阶滑模控制保证了微网系统具有更快的响应速度和较强的鲁棒性. 对比的仿真和实验结果表明, 所设计的控制策略可以快速跟踪电网电压信息, 有效提高逆变器输出电压的动态调节能力

英文摘要

      For the delay reason of grid-side information acquisition in the switching process of single inverter from offgrid to grid-connected, it’s difficult to realize the function of self-synchronizing grid information of inverter for the classical virtual impedance method. This paper designs a finite-time full-order sliding mode (FOSM) DC bus voltage/reactive power controller. Compared with PQ controller, the proposed controller can reduce the complex phase-locked loop (PLL), can realize self-synchronous tracking of grid information including the grid-side frequency and voltage informations compared with virtual synchronous generator (VSG) control, finite-time FOSM can realize faster response speed and stronger robustness compared with the traditional proportional-integral control. The simulation and experimental results show that the proposed control strategies can quickly track the grid voltage information, and effectively improve the dynamic regulation ability of the inverter output voltage.