Abstract
In multi-interconnected power system, keeping the changes in frequencies and tie-line powers at their specified values is vital process especially during operation under load disturbance. This target can be achieved by installing load frequency control (LFC), the main object of LFC is damping the deviations of frequencies and tie-line powers to zero. This paper proposes a new approach incorporated recent optimizer of movable damped wave algorithm (MDVA) to identify the unknown parameters of LFC represented by fractional-order proportional integral derivative (FOPID). FOPID controller is selected as it has better and robust performance, the controller is installed in multi-interconnected system with multi-sources considering renewable energy-based plants. Minimizing the integral time absolute error (ITAE) of the change in frequencies and tie-line powers is the main target. Two power systems are considered in this work, the first one comprises photovoltaic (PV) and thermal generating units while the second system includes four plants of PV, wind turbine (WT), and two thermal based plants. Moreover, the generation rate constraints and governor dead-band of thermal plant are considered. Different load disturbances in both studied systems are investigated and the obtained results via the proposed DMVA are compared to coronavirus herd immunity optimizer (CHIO), antlion optimizer (ALO), sooty tern optimization algorithm (STOA), manta ray foraging optimizer (MRFO), and sin-cos algorithm (SCA). Regarding the two-interconnected system, the proposed DMVA succeeded in achieving the best ITAE of 6.3911 during 10% disturbance applied on PV plant. Regarding to the multi-interconnected system, the best (minimum) fitness function is 0.015029 achieved via the proposed DMVA at 1% load disturbance on the first area. The results confirmed the robustness of the proposed algorithm in solving the LFC parameter estimation.
Highlights
The stability of power system operation is a vital issue that should be considered especially in case of sudden load disturbances
Two interconnected systems are considered in this work, the first one comprises PV based plant connected to thermal generating unit with reheater
One can get that the proposed approach incorporated damped movable wave algorithm (DMVA) is efficient in identifying the optimal parameters fractional-order PID (FOPID) based Load frequency control (LFC) installed in PV/thermal interconnected system operated at different load disturbances
Summary
The stability of power system operation is a vital issue that should be considered especially in case of sudden load disturbances. Fathy et al [29] presented a Fuzzy-PID based LFC optimized via mine blast algorithm (MBA) installed in multi-interconnected system, the main target is to minimize the ITAE of the frequencies and tie-line powers’ fluctuations during load disturbance. Datta et al [33] introduced fractional-order PID controller for simulating LFC, bacterial foraging optimizer was used to optimize the controller parameters, the constructed controller was installed in interconnected system with hybrid WT and PV based plant. The authors considered all these defects by proposing fractional-order PID (FOPID) based LFC optimized via recent approach of movable damped wave algorithm (MDVA) and installed in multi-interconnected system with RESs. The authors selected FOPID controller as it has more adaptable response in terms of time and frequency, it has better and robust performance. The paper is organized as follows: section II presents the models of the different interconnected systems, section III introduces the principles of movable damped wave algorithm (MDVA), section IV shows the proposed solution methodology, section V presents the results and discussions, and section VI introduces the conclusions
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