This paper presents a new optimized fuzzy-PID controller to improve frequency stability in two-area interconnected power system with high voltage direct current (HVDC) link connection. A novel nature-inspired algorithm called Multi-Verse Optimizer (MVO) was employed to solve the optimal frequency regulation problem. To show the effectiveness of the proposed control strategy, the two-area interconnected Hokkaido-Honshu of Eastern Japan 50-Hz power system with Kita-Hon HVDC link was investigated for the simulation. The proposed MVO algorithm was used to satisfy two main objectives. Firstly, MVO was adopted to estimate the unknown parameters of the test system and model the HVDC link for the Load Frequency Control (LFC) analysis. Secondly, MVO was applied to optimize the suggested fuzzy-PID controller parameters including the scaling factors of fuzzy logic and the PID controller gains. The estimated unknown parameters of the simulated model were compared with other existing results in literature. The effects of the HVDC Link on system frequency are analyzed. Moreover, dynamic responses obtained from the simulation satisfy the LFC requirements and reveal that the proposed control strategy based on MVO algorithm enhance the frequency stability in terms of settling time and peak overshoots.
['Nour El Yakine Kouba', 'Mohamed Menaa', 'Mourad Hasni', 'Kambiz Arab Tehrani', 'Mohamed Boudour']
A novel optimized fuzzy-PID controller in two-area power system with HVDC link connection