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In this paper, a current sharing method based on the circular chain control (3C) method is proposed for controlling parallel inverters of unequal ratings in uninterruptible power supply (UPS) applications. Due to its circular structure, 3C is one of the most convenient methods which can be used in UPS as well as microgrid systems. However, the conventional 3C control strategy is only applicable to inverters of equal power ratings. The proposed method not only retains the circular structure of the 3C method, but also provides adaptability for the parallel operation of inverters with different power ratings. Moreover, this method adds hot-swap capability to the parallel inverter. A two-loop control structure is used to control the inverters. For proper current sharing, currents of inverters are conveyed in a circular structure with appropriate gains through control links. Simulation and experimental results for linear and nonlinear loads verify the effectiveness of the proposed strategy.
Mahdi Shahparasti; Mehdi Savaghebi; Majid Hosseinpour; Navid Rasekh. Enhanced Circular Chain Control for Parallel Operation of Inverters in UPS Systems. Sustainability 2020, 12, 8062 .
AMA StyleMahdi Shahparasti, Mehdi Savaghebi, Majid Hosseinpour, Navid Rasekh. Enhanced Circular Chain Control for Parallel Operation of Inverters in UPS Systems. Sustainability. 2020; 12 (19):8062.
Chicago/Turabian StyleMahdi Shahparasti; Mehdi Savaghebi; Majid Hosseinpour; Navid Rasekh. 2020. "Enhanced Circular Chain Control for Parallel Operation of Inverters in UPS Systems." Sustainability 12, no. 19: 8062.
Proton Exchange Membrane Fuel Cell (PEMFC) systems are environment-friendly systems that can be used as distributed power generation (DPG) system. As DPG units are usually utilized in weak power distribution systems, the grid inductance variations should be investigated during the control design stage of the grid-tied fuel cell systems. In recent years, LCL filter is broadly utilized to grid connection of DPG units, and the proper design of this filter is an important issue. In this paper, converter side current feedback (CSCF) method has been applied due to its innate damping feature to integrate PEMFC fuel cell system through LCL filter into weak power distribution system. The impact of delay should be considered as it limits the stability region of the resonance frequency of the CSCF control method especially, in the presence of wide variations of the grid inductance. Precise-tuned LCL filter design and consequently, the proper choice of the resonance frequency can remarkably affect the performance of the CSCF control. An adequate-tuned design procedure for LCL filter parameters has been proposed in this paper. Step-by-step tuning of the PR controller parameters has also been included to enhance the power quality. The grid-tied fuel cell system with modified-Y-Source inverter and LCL filter as an interface between inverter and grid has been simulated to analyze the quality of the injected power. Simulation results in MATLAB/Simulink environment verify the suitable performance of the proposed power conditioning system as well as its stable operation versus wide variation of weak grid inductance.
Navid Rasekh; Majid Hosseinpour. LCL filter design and robust converter side current feedback control for grid-connected Proton Exchange Membrane Fuel Cell system. International Journal of Hydrogen Energy 2020, 45, 13055 -13067.
AMA StyleNavid Rasekh, Majid Hosseinpour. LCL filter design and robust converter side current feedback control for grid-connected Proton Exchange Membrane Fuel Cell system. International Journal of Hydrogen Energy. 2020; 45 (23):13055-13067.
Chicago/Turabian StyleNavid Rasekh; Majid Hosseinpour. 2020. "LCL filter design and robust converter side current feedback control for grid-connected Proton Exchange Membrane Fuel Cell system." International Journal of Hydrogen Energy 45, no. 23: 13055-13067.
Distributed power generation systems use power electronics converters as interface for connection to grid. The connection through an LCL filter offers certain advantages, but it brings also the disadvantage of having a resonance frequency. Power electronic converter control is challenging due to filter resonance peak. In this paper a three level ultra-efficient converter called T-Type converter is connected to grid through an LCL filter and its injected current is controlled by PR controller. The resonance peak of the filter is also damped using filter capacitor current feedback. A step by step mathematical design procedure for controller and filter capacitor current feedback coefficient is investigated in details. Simulations are carried out in MATLAB/Simulink environment and results depict suitable performance of the system with designed parameters.
Navid Rasekh; Mohammad Mohsen Rahimian; Majid Hosseinpour; Abdolmajid Dejamkhooy; Adel Akbarimajd. A Step by Step Design Procedure of PR controller and Capacitor Current Feedback Active Damping for a LCL-Type Grid-tied T-Type Inverter. 2019 10th International Power Electronics, Drive Systems and Technologies Conference (PEDSTC) 2019, 612 -617.
AMA StyleNavid Rasekh, Mohammad Mohsen Rahimian, Majid Hosseinpour, Abdolmajid Dejamkhooy, Adel Akbarimajd. A Step by Step Design Procedure of PR controller and Capacitor Current Feedback Active Damping for a LCL-Type Grid-tied T-Type Inverter. 2019 10th International Power Electronics, Drive Systems and Technologies Conference (PEDSTC). 2019; ():612-617.
Chicago/Turabian StyleNavid Rasekh; Mohammad Mohsen Rahimian; Majid Hosseinpour; Abdolmajid Dejamkhooy; Adel Akbarimajd. 2019. "A Step by Step Design Procedure of PR controller and Capacitor Current Feedback Active Damping for a LCL-Type Grid-tied T-Type Inverter." 2019 10th International Power Electronics, Drive Systems and Technologies Conference (PEDSTC) , no. : 612-617.