access icon free Three-phase tri-state buck–boost integrated inverter for solar applications

This study presents a three-phase tri-state buck–boost integrated inverter suitable for stand-alone and/or grid-connected photovoltaic (PV) energy applications. The usage of the special features of the tri-state operation coupled with a modified space vector modulation allows the inverter to present a remarkable degree of freedom for the controllers’ design, that is, input and output can be independently controlled. As the input can be autonomously controlled, this converter is very attractive for interfacing renewable energy sources as PV panels, once the main duty cycle D 1 controls the maximum power point tracking and the second duty cycle D 2 is responsible to feed the output. It should be pointed out that there are no power electrolytic capacitors in this integrated inverter, which results in a major advantage for the structure working life and it is the first time in the literature that this inverter is used to feed power into the grid. Throughout this study the system is described, the modulation and control schemes are presented and interesting experimental results are available in order to confirm the outstanding features of this proposal.

Inspec keywords: PWM invertors; solar power; control system synthesis; photovoltaic power systems; power generation control; power grids; power system interconnection; maximum power point trackers

Other keywords: renewable energy sources; solar applications; controller design; three-phase tri-state buck–boost integrated inverter; modified space vector modulation; grid connected photovoltaic energy applications; standalone applications; duty cycle; maximum power point tracking; degree of freedom; PV panels

Subjects: DC-AC power convertors (invertors); Control system analysis and synthesis methods; Power system control; Control of electric power systems; Solar power stations and photovoltaic power systems; DC-DC power convertors; Power system management, operation and economics

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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-rpg.2014.0072
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