The adaptive interval type-2 (IT2) fuzzy output feedback control problem is studied for a single-phase photovoltaic grid-connected power system. The equivalent resistors of the inductors in the system are unknown and the part states are not available. Interval type-2 fuzzy logic systems (IT2FLSs) are utilized to approximate the uncertain nonlinear dynamics, and an IT2 fuzzy state observer is designed to estimate the unavailable states. By introducing a command filter method and using a backstepping control design technique, an IT2 fuzzy output feedback control scheme is investigated, in which the constraint conditions of pulse width modulation are ensured via mean-value theorem. It is proved that all the variables of the closed-loop photovoltaic system are uniformly ultimately bounded. The simulation and comparison results demonstrate the validity of the proposed control scheme.

研究了单相光伏并网电力系统的自适应区间2型(IT2)模糊输出反馈控制问题。系统中电感的等效电阻未知，部件状态不可用。区间类型 2 模糊逻辑系统 (IT2FLS) 用于逼近不确定的非线性动力学，并设计了 IT2 模糊状态观察器来估计不可用状态。通过引入指令滤波方法和反步控制设计技术，研究了一种IT2模糊输出反馈控制方案，其中通过均值定理来保证脉宽调制的约束条件。证明闭环光伏系统的所有变量最终一致有界。