Abstract
To deal with the problem of generation rate constraint (GRC) during load frequency control (LFC) design for a multi-area interconnected power system, this paper proposes an anti-windup controller design method. Firstly, an H ∞ dynamic controller is designed to obtain robust performance of the closed-loop control system in the absence of the GRC. Then, an anti-windup compensator (AWC) is formulated to restrict the magnitude and rate of the control input (namely power increment) in the prescribed ranges so that the operation of generation unit does not exceed the physical constraints. Finally, the anti-windup LFC is tested on the multi-area interconnected power systems, and the simulation results illustrate the effectiveness of the proposed LFC design method with GRC.
Highlights
In a multi-area interconnected power system, it is important for the system’s operation to keep the active power balance and regulate the tie-line power at the scheduled value
Focusing on the Load frequency control (LFC) design with generation rate constraint (GRC), this paper proposes an anti-windup LFC design method for the multi-area interconnected power system
Towards the GRC problem in the LFC, this paper proposes an anti-windup controller design method
Summary
In a multi-area interconnected power system, it is important for the system’s operation to keep the active power balance and regulate the tie-line power at the scheduled value. Towards LFC design with GRC, the extended integral control method in [26], the biased PI dual mode control method in [27], the Type-2 fuzzy approach in [28], and the anti-GRC PI-type controller in [29,30] are adopted to deal with the GRC problem. Focusing on the LFC design with GRC, this paper proposes an anti-windup LFC design method for the multi-area interconnected power system. The designed LFC consists of a robust H∞ controller and an anti-windup compensator (AWC) The former is used to guarantee the stability and robustness of the closed-loop system without constraints, and the latter takes charge of restricting the rate and magnitude of control input in the prescribed ranges to make the operation of generation unit meet the GRC requirement. The comparative simulation results show that the performances of the LCF are improved by the design method of this paper
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