A distributed model predictive control based load frequency control scheme for multi-area interconnected power system using discrete-time Laguerre functions. (May 2017) - Zheng, Yang
Abstract: This paper proposes a distributed model predictive control based load frequency control (MPC-LFC) scheme to improve control performances in the frequency regulation of power system. In order to reduce the computational burden in the rolling optimization with a sufficiently large prediction horizon, the orthonormal Laguerre functions are utilized to approximate the predicted control trajectory. The closed-loop stability of the proposed MPC scheme is achieved by adding a terminal equality constraint to the online quadratic optimization and taking the cost function as the Lyapunov function. Furthermore, the treatments of some typical constraints in load frequency control have been studied based on the specific Laguerre-based formulations. Simulations have been conducted in two different interconnected power systems to validate the effectiveness of the proposed distributed MPC-LFC as well as its superiority over the comparative methods. Highlights: A distributed MPC-LFC scheme with discrete-time Laguerre functions incorporated is proposed. Online computational burden in MPC-LFC is reduced significantly. Closed-loop stability of the control system is guaranteed by a large prediction horizon. Treatments of different types of constraints in MPC-LFC are discussed in detail. The approximation capability of Laguerre functions has been investigated.