Flexible control of small wind turbines with grid failure detection operating in stand-alone and grid-connected mode

被引:304
作者
Teodorescu, R [1 ]
Blaabjerg, F [1 ]
机构
[1] Aalborg Univ, Power Elect Syst Sect, Inst Energy Technol, DK-9220 Aalborg, Denmark
关键词
digital signal processor (DSP) control; grid failure; grid monitoring; phase-locked loop (PLL); renewable energy; wind turbine;
D O I
10.1109/TPEL.2004.833452
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents the development and test of a flexible control strategy for an 11-kW wind turbine with a back-to-back power converter capable of working in both stand-alone and grid-connection mode. The stand-alone control is featured with a complex output voltage controller capable of handling nonlinear load and excess or deficit of generated power. Grid-connection mode with current control is also enabled for the case of isolated local grid involving other dispersed power generators such as other wind turbines or diesel generators. A novel automatic mode switch method based on a phase-locked loop controller is developed in order to detect the grid failure or recovery and switch the operation mode accordingly. A flexible digital signal processor (DSP) system that allows user-friendly code development and online tuning is used to implement and test the different control strategies. The back-to-back power conversion configuration is chosen where the generator converter uses a built-in standard flux vector control to control the speed of the turbine shaft while the grid-side converter uses a standard pulse-width modulation active rectifier control strategy implemented in a DSP controller. The design of the longitudinal conversion loss filter and of the involved PI-controllers are described in detail. Test results show the proposed methods works properly.
引用
收藏
页码:1323 / 1332
页数:10
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