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Design and Analysis of the Droop-Controlled Parallel Four-leg Inverters to Share Unbalanced and Nonlinear Loads
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Majid Hosseinpour *   , Mustafa Mohamadian , Ali Yazdian Varjani |
| Tarbiat Modares University , hoseinpour.majid@gmail.com |
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Abstract: (15986 Views) |
| In this paper, the performance of wireless operation of four-leg parallel inverters, at the presence of unbalanced nonlinear loads, is investigated. In order to control the parallel inverters, an inner current and external voltage control loops should be designed. In this paper, a proportional controller for the current internal loop as well as a proportional-resonant one for the voltage external loop are investigated and designed to ensure the proper performance of the system at the presence of unbalanced and nonlinear loads. In this paper, droop control and virtual output impedance loops have formed the power sharing control system for the parallel inverters. The proposed system is able to feed balanced, unbalanced, and nonlinear loads and provides an appropriate sinusoidal voltage waveform for loads by accurately sharing power between the parallel inverters. Simulation results verify the accurate and proper performance of the proposed system. |
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| Keywords: four-leg inverter, parallel inverters operation, Droop method, Virtual output resistive impedance |
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Full-Text [PDF 487 kb]
(3955 Downloads)
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Type of Study: Research |
Subject:
Power Electronics Application in Power Systems
Received: 2013/05/20 | Accepted: 2013/12/1 | Published: 2014/01/5
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