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An improved passivity-based control strategy for providing an accurate coordination in a AC/DC hybrid microgrid

AN IMPROVED PASSIVITY-BASED CONTROL STRATEGY FOR PROVIDING AN ACCURATE COORDINATION IN A AC/DC HYBRID MICROGRID

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  • TEMAPS145
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AN IMPROVED PASSIVITY-BASED CONTROL STRATEGY FOR PROVIDING AN ACCURATE COORDINATION IN A AC/DC HYBRID MICROGRID

An Improved Passivity-Based Control Strategy For Providing An Accurate Coordination In a AC/DC Hybrid Micro-grid

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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