Development and experimental verification of counter-rotating dual rotor/dual generator wind turbine: Generating, yawing and furling. (December 2017)

• Record Type: Journal Article
• Authors: Cho, Whang; Lee, Kooksun; Choy, Ick; Back, Juhoon
• Is Part Of: Renewable energy. Volume 114:Part B(2017)
• Page Start: 644
• Page End: 654
• Publication Date: 2017-12
• Subjects: Wind turbine -- Yawing -- Furling -- Dual generator -- Maximum power point tracking -- Counter-rotating dual rotor; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2017.06.083
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: This paper deals with the control techniques for counter-rotating dual rotor/dual generator(CRDRDG) wind turbine and its experimental verifications of the performance in the field. The authors have already proposed the dynamic model and some control techniques in the previous researches, which exploit some features of the CRDRDG structures, and verified the controllers by numerical simulations and lab-scale experiments. In this paper, we present experimental results obtained using a full scale ( 15 [ k W ] ) CRDRDG in the field. To perform the field experiments, an integrated control algorithm is proposed. The experimental results show that the integrated control algorithm effectively maximizes the output power of the CRDRDG wind turbine while operating in the region below rated power, and limits the output power while operating in the region above rated power. Furthermore, the experimental data reveals an additional advantage of the counter-rotating dual rotor system. The data shows that the system can lower the tip speed ratio at which Cp curve attains its maximum, almost by half in comparison to the conventional three bladed single rotor system, possibly reducing the noise caused by rotor blades. Highlights: Two generators fixed on a tower can control generation and yawing, cooperatively. Dual generator system can reduce the inverter size and driveline capacity by half. Counter rotating dual rotor can be operated at lower speed than single rotor system. An integrated control algorithm for CRDRDG turbine system is proposed.