Abstract
A method to synchronize and control a system of parallel single-phase inverters without communication is presented. Inspired by the phenomenon of synchronization in networks of coupled oscillators, we propose that each inverter be controlled to emulate the dynamics of a nonlinear dead-zone oscillator. As a consequence of the electrical coupling between inverters, they synchronize and share the load in proportion to their ratings. We outline a sufficient condition for global asymptotic synchronization and formulate a methodology for controller design such that the inverter terminal voltages oscillate at the desired frequency, and the load voltage is maintained within prescribed bounds. We also introduce a technique to facilitate the seamless addition of inverters controlled with the proposed approach into an energized system. Experimental results for a system of three inverters demonstrate power sharing in proportion to power ratings for both linear and nonlinear loads.
Original language | English (US) |
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Article number | 6692879 |
Pages (from-to) | 6124-6138 |
Number of pages | 15 |
Journal | IEEE Transactions on Power Electronics |
Volume | 29 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2014 |
Keywords
- Distributed ac power systems
- inverters
- microgrids
- nonlinear control
- oscillators
- synchronization
- uninterruptible power supplies
- voltage source inverters
ASJC Scopus subject areas
- Electrical and Electronic Engineering