An improved passivity-based control strategy for providing an accurate coordination in a AC/DC hybrid microgrid |
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| Institution: | 1. Department of Electrical Engineering, Gorgan Branch, Islamic Azad University, Gorgan, Iran;2. Department of Electrical Engineering, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran;3. Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran;4. ERAdiate Team, University of Zilina, Zilina, Slovakia;1. Brno University of Technology, Faculty of Electrical Engineering and Communication, Technická 3058/10, 616 00 Brno, Czechia;2. Masaryk University, Faculty of Economics and Administration, Lipová 507/41a, 602 00 Brno, Czechia;3. Brno University of Technology, Faculty of Civil Engineering, Veve?í 331/95, 602 00 Brno, Czechia;4. Tatas Shevchenko National University of Kiev, Faculty of Computer Sciences and Cybernetics, Volodymirska str. 64, 01601 Kiev, Ukraine;1. Institute of Artificial Intelligence and Control, School of Automation & Electronics Engineering, Qingdao University of Science & Technology, Qingdao 266061, PR China;2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada;3. Advanced Control Systems Lab, School of Electronics & Information Engineering, Beijing Jiaotong University, Beijing 100044, PR China;1. Department of Inertia, Changcheng Institute of Metrology & Measurement, Beijing 100095, China;2. School of Automation, Beijing Institute of Technology, Beijing 100081, China;3. College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China;1. Department of Electrical Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran;2. Department of Electrical Engineering, Shahid Sattari Aeronautical University, Tehran, Iran;1. College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;2. State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China |
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| Abstract: | This paper proposes an improved passivity-based control (PBC) technique to provide accurate coordination between AC and DC sides of a grid-tied AC/DC hybrid microgrid. The proposed PBC is based on the passive properties of the system and the energy exchange between the subsystems. To this end, three mathematical formulations for the converters are driven in the first step. Then, using the formulations, the impedance injection is applied to shape the error dynamics of all DC/DC and DC/AC converters. The DC link-connected DC/AC converter is used to help the AC side for maintenance of the power quality factors such as, the grid frequency and voltage magnitude in the presence of any unbalanced power load sharing. The first contribution of the paper is the part of impedance injection to the DC/AC converter, which aims to provide more decoupling and faster convergence rate for both the steady states and the dynamical conditions. Secondly, a Lyapunov function is defined for converters’ error dynamics that provide more accurate statement of the proposed damping injections. Besides, as an attractive control feature, decoupling properties of the suggested method are investigated. Then, through achieving several curves, various operating conditions of DC/DC and DC/AC converters under varying the system errors and proposed damping injections are evaluated as well. For the purpose of validation, the system under study is simulated in the MATLAB/SIMULINK software package against a variety of system errors and converters’ operational conditions. |
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