Abstract
Load frequency control (LFC) is necessary to guarantee the safe operation of power systems. Aiming at the frequency and power stability problems caused by load disturbances in interconnected power systems, active disturbance rejection control (ADRC) was designed. There are eight parameters that need to be adjusted for an ADRC, which are challenging to adjust manually, thus limiting the development of this approach in industrial applications. Regardless of the theory or application, there is still no unified and efficient parameter optimization method. The traditional particle swarm optimization (PSO) algorithm suffers from premature convergence and a high computational cost. Therefore, in this paper, we utilize an improved PSO algorithm, a reinforcement-learning-based memetic particle swarm optimization (RLMPSO), for the parameter tuning of ADRC to obtain better control performance for the controlled system. Finally, to highlight the advantages of the proposed RLMPSO-ADRC method and to prove its superiority, the results were compared with other control algorithms in both a traditional non-reheat two-area thermal power system and a non-linear power system with a governor dead band (GDB) and a generation rate constraint (GRC). Moreover, the robustness of the proposed method was tested by simulations with parameter perturbations and different working conditions. The simulation results showed that the proposed method can meet the demand for the frequency deviation to stabilize to 0 in LFC with higher performance, and it is worthy of popularization and application.
Highlights
M AINTAINING the relative stability of the frequency and voltage is a prerequisite for ensuring the safe operation of a power system
DESIGN OF ACTIVE DISTURBANCE REJECTION CONTROL (ADRC) active disturbance rejection control (ADRC) is derived from the combination of the classic PID and modern control theory, which has the advantages of not relying on model information and eliminating unknown disturbances
Supposing that when t = 0, the first area is disturbed by a step-load disturbance (SLP) ∆PL1 = 0.1 p.u
Summary
M AINTAINING the relative stability of the frequency and voltage is a prerequisite for ensuring the safe operation of a power system. As a well-known issue in power systems research, how to implement load frequency control (LFC) to ensure a constant frequency of a power system and improve the power quality and economic benefits have been widely studied. As the demand for power quality has increased, interconnected power systems have emerged. The exchange power of tie-lines in an interconnected power system is susceptible to disturbances, which may cause unnecessary economic losses. Determining how to design a controller to ensure the safe, stable, and efficient operation of the power system is of great significance. The essential requirement of a control strategy is to have the ability to process parameter uncertainty and achieve a good anti-disturbance performance while obtaining the de-
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