Demand Response-Based Aperiodic Sampled-Data Load Frequency Control for Multiarea Power Systems With Communication Delays

This article investigates the stability analysis and controller design of load frequency control (LFC) power system with demand response (DR) considering communication delays, which integrates DR resources to facilitate ancillary frequency regulation services. Initially, the multiarea LFC continuous-time model with DR is transformed into multiarea discrete time model by setting reasonable control input. Then, the linear operators are used to represent the uncertainty of communication delays and aperiodic sampled-data periods in system, and then the discrete system is transformed into a feedback interconnected system composed of uncertainty operators and linear time-invariant system. Subsequently, the uniform exponential stability condition of the system is given by using integral quadratic constraint theory and Bohl-Perron principle. On the basis, a new control scheme is designed and an iterative algorithm of the controller is given considering transmission delay and aperiodic sampling with decoupling technology. Finally, simulation results in one-area, two-area, and 39-bus test system also verify that the proposed method has effectiveness and superiority in the LFC system with DR.