Control of a grid-connected direct-drive wind energy conversion system |
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| Affiliation: | 1. Servo Control Engineering Center of Education Ministry, Southeast University, Nanjing 210096, China;2. Department of Electronic and Electrical Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD, UK;1. Agricultural & Biological Engineering, Purdue University, West Lafayette, IN 47907, USA;2. Biobased Products and Energy Center, Department of Biosystems & Agricultural Engineering, Oklahoma State University, Stillwater, OK 74078, USA;1. Institut UTINAM UMR CNRS 6213, Université de Franche-Comté, UFR Sciences et Techniques, 16 Route de Gray, 25030 Besançon Cédex, France;2. Solaronix SA, 129, rue de l''Ouriette, 1170 Aubonne, Switzerland;1. University of Alaska Anchorage, Anchorage, AK, USA;2. Mechanical Engineering Dept., Ohio University, Athens, OH, USA;3. Civil Engineering Dept., University of Alaska Anchorage, Anchorage, AK, USA;4. Electrical Engineering Dept., University of Alaska Anchorage, Anchorage, AK, USA;5. Mechanical Engineering Dept., University of Alaska Anchorage, Anchorage, AK, USA |
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| Abstract: | This paper investigates the current control for a grid-connected direct-drive wind energy conversion system (DDWECS) with a permanent magnet synchronous generator (PMSG), which utilizes a back-to-back pulse width modulation (PWM) converter. For the machine-side, the controller adopts a current vector control method based on the rotating reference frame (RRF) and the maximum power extraction (MPE) is realised through the tip speed ratio (TSR) method. For the grid-side, a novel controller is proposed for the first time to be successfully used for the DDWECS, which combining a proportional complex integral (PCI) current inner loop based on stationary reference frame (SRF) for regulating the grid-side current with a dc voltage outer loop for stabilizing the dc bus voltage and compare with the proportional resonant (PR) controller. A system simulation model is established by using the Matlab/Simulink to simulate the performance of the DDWECS and a prototype system has been build and tested to verify the validity of the developed control methods for both machine-side and grid-side and the excellent performance of the DDWECS. |
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| Keywords: | Current vector control Grid-connected direct-drive wind energy conversion system Proportional complex integral control Rotating reference frame Stationary reference frame |
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