In this paper, a wind energy conversion system interfaced to the grid using a dual inverter is proposed. One of the two inverters in the dual inverter is connected to the rectified output of the wind generator while the other is directly connected to a battery energy storage system (BESS). This approach eliminates the need for an additional dc–dc converter and thus reduces power losses, cost, and complexity. The main issue with this scheme is uncorrelated dynamic changes in dc-link voltages that results in unevenly distributed space vectors. A detailed analysis on the effects of these variations is presented in this paper. Furthermore, a modified modulation technique is proposed to produce undistorted currents even in the presence of unevenly distributed and dynamically changing space vectors. An analysis on the battery charging/discharging process and maximum power point tracking of the wind turbine generator is also presented. Simulation and experimental results are presented to verify the efficacy of the proposed modulation technique and battery charging/discharging process.

Item Type:	Refereed Article
Keywords:	Dual inverter, energy storage, non-integer voltage ratio, wind energy
Research Division:	Engineering
Research Group:	Electrical engineering
Research Field:	Electrical engineering not elsewhere classified
Objective Division:	Energy
Objective Group:	Energy efficiency
Objective Field:	Energy efficiency not elsewhere classified
UTAS Author:	Jayasinghe Arachchillage, SDG (Dr Shantha Jayasinghe Arachchillage)
ID Code:	101316
Year Published:	2011
Web of Science® Times Cited:	40
Deposited By:	Seafaring and Maritime Operations
Deposited On:	2015-06-17
Last Modified:	2017-11-06
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