Control
Morteza Alizadeh; Hossein Askarian Abyaneh; Alireza Bakhshai; Naser Khodabakhshi Javinani
Abstract
This paper applies a new state feedback control to a distributed secondary voltage and frequency control in an islanded microgrid. The problem is focused on the output consensus of the multi-agent systems, which is converted to a first-order dynamic system. The inverter-based distributed generations ...
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This paper applies a new state feedback control to a distributed secondary voltage and frequency control in an islanded microgrid. The problem is focused on the output consensus of the multi-agent systems, which is converted to a first-order dynamic system. The inverter-based distributed generations play as agents in the proposed control strategy. It is assumed that the distributed generators communicate through a communication network modeled by a directed graph (digraph). The distributed output consensus is used to design the secondary controllers. Such innovative controllers synchronize distributed generators' output voltages and frequencies to their reference values by a novel state feedback approach. Compared to the existing consensus protocols, the proposed method provides a different innovative solution to the secondary voltage and frequency control of microgrids, which has a better response in case of communication failures. Finally, extensive and comparative simulations have been presented to verify the validity of the proposed control strategy and the system performance.
Power systems
Sirus Salehimehr; Behrooz Taheri; Seyed Amir Hosseini; Hossein Askarian Abyaneh; Farzad Razavi
Abstract
In this paper, a new method based on Hilbert transform is proposed to detect the power swing and faults occurring during the power swing. The proposed method operates independently from the system parameters. As well as, this method has the ability to detect different types of power swings, including ...
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In this paper, a new method based on Hilbert transform is proposed to detect the power swing and faults occurring during the power swing. The proposed method operates independently from the system parameters. As well as, this method has the ability to detect different types of power swings, including stable, unstable, and multi-mode power swings, and also can differentiate the power swing from the faults for blocking or unblocking the distance relay. In order to evaluate the proposed method, various types of power swing and simultaneous faults are simulated in DIgSILENT software and then using the obtained matrix data from the current signals, the proposed algorithm has been implemented in Matlab software using the Hilbert transform. The results of this study show that the proposed method can detect different types of power swing successfully. In addition, it has been shown that the proposed method operates very fast; besides when a fault occurs simultaneously with the power swing unblocks the relay as soon as possible. This method has been also implemented practically on a distance relay and is tested by a relay tester device made by Vebko Amirkabir knowledge-based company. The results obviously show that the proposed method has a better operation than industrial conventional methods.