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Dead Zone Oscillator Control for Communication-Free Synchronization of Paralleled, Three-Phase, Current-Controlled Inverters

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Technical Report

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U.S. Naval Academy Annapolis

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The prevalence of converter-interfaced power sources in the power grids of both civilian and military systems is increasing due to technological improvements in power conversion and changing requirements in system loads. The development of high-power pulsed loads on naval platforms, such as the Laser Weapon System LaWS and the electromagnetic railgun, calls for the ability to rapidly and drastically change the allocation of power in a system that contains many other loads. A new method of synchronizing parallel-connected converter-interfaced power sources, which involves controlling converters to emulate the dynamics of a nonlinear dead-zone oscillator, may provide an advantage. This method, termed Virtual Oscillator ControlVOC, was previously tested and validated for networks of single-phase, voltage-source power converters and supported in simulation fornetworks of three-phase, voltage-source inverters. The effectiveness of VOC in the control of three-phase grids was here validated through hardware experimentation. Additionally, VOC was extended to implementation with current-controlled inverters, which are very prevalent in power systems because of their enhanced safety and circuit-protection features. The hardware validation and performance evaluation of VOC applied to networks of parallel-connected, three-phase, current-controlled inverters is here detailed.

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