Finite-time Integrative Consensus Control for Active Power Sharing in Autonomous Microgrid

Active powers and frequencies must be communicated among neighboring DGs to compute active power sharing error and frequency error for generating consensus protocol, which complicates the control greatly. Aiming at that, this paper proposed a finite-time integrative active power control. Finite-time consensus algorithm is applied on frequency adjustment in secondary control of P-f. The relationship between frequency deviation and frequency adjustment as well as active power sharing is inferred, which is used in consensus protocol to eliminate frequency and leads to an integrative controller. In the proposed control, accurate active power sharing and frequency restoration can be achieved only via communicating active powers among neighboring DGs, which simplifies control implementation and ease communication burden. The feasibility of the proposed method is validated through a specially constructed Lyapunov function. For finite-time consensus control technique is also applied to reactive power sharing and weighted average voltage of all DGs is also restored to nominal value. Simulation proves the effectiveness of the method.