Abstract
Compared with the single rotor wind turbine, a counter-rotating (CR) wind turbine with two rotor sets leads to twice power density. In this regard, dual stator CR (DSCR) permanent magnet flux switching generator (DSCR-PMFSG) is employed. However, in DSCR-PMFSG both rotor and armature parts are rotating and require slip rings for power transmission. These slip rings associate demerits of constant maintenance, poor speed regulation, increased cost, and additional slip ring losses, whereas DSCR-PMFSG offer lower flux and lesser power density. To overcome the demerits of DSCR-PMFSG as mentioned earlier, this paper proposed a novel dual rotor counter-rotating permanent magnet flux switching generator (DRCR-PMFSG) for wind turbine applications that eliminate the requirements of slip rings and retain brushless operation. The proposed DRCR-PMFSG share one stator connected back-to-back through a flux bridge that provides an alternate flux path between two mechanical ports associated with the inner rotor and outer rotor, contributing to the cumulative output. A detailed comparative analysis of DSCR-PMFSG and DRCR-PMFSG is performed under static characteristics, overload, and wide speed range to generate output power, voltage, current, power density, and efficiency. Quantitative comparative analysis under static analysis evident that proposed DRCR-PMFSG exhibits 33.29% higher flux, suppressed cogging torque and torque ripples up to 53.48% and 67.45%, respectively. Furthermore, a comprehensive quantitative analysis is performed under coupled overload and over-speed capability. Analysis exposes that in comparison with DSCRP-PMFSG, the proposed DRCR-PMFSG improves voltage regulation factor by 55.88%, output current enhanced by 67.9%, raise output voltage to 2.01 times, and power density to 1.72 times while maintaining the efficiency of 90.195% and achieving stable voltage profile with load variation. Finally, a detailed comparative analysis with conventional designs is performed and comprehensive mathematical modelling based on sub-domain model is developed accounting stator slot and rotor pole combinations, magnetic saturation, and winding configuration to validates finite element analysis (FEA) of JMAG Designer v.20.1.
Highlights
INTRODUCTIONCompared with non-renewable energy, wind energy emerged as the most economical and feasible fast-growing renewable energy source for wind power generation, with an installed capacity of 744 GW by the end of 2020 [1]
Compared with non-renewable energy, wind energy emerged as the most economical and feasible fast-growing renewable energy source for wind power generation, with an installed capacity of 744 GW by the end of 2020 [1].The associate editor coordinating the review of this manuscript and approving it for publication was Xiaodong Lian .Wind energy conversion is based on the direct coupling of horizontal/vertical axis wind turbines with the shaft of generators that contributes to the power supplied to local grids, microgrids, or national grid or even energy storage systems in batteries for later uses
To overcome the aforesaid demerits of permanent magnet (PM) demagnetization in dual stator CR (DSCR)-PM flux switching generator (PMFSG), friction loss in slip ring of DSCR-PMFSG and dual rotor occupying armature winding and PMs in inner rotor, eliminating slip ring requirements to retain brushless operation in comparison with brushed operation of dual operating mode dual rotor and DSCR-PMFSG, complex assembly and leakage flux issues of partitioned stator, issues of reverse flux flow in modular stator structure, friction losses of DSCR-PMFSG, overhang effect of distributed winding in dual-stator topology and further improvement in torque and power density, this paper proposes a novel dual rotor counter-rotating PMFSG (DRCR-PMFSG) with single tooth non-overlapped concentrated winding for counter-rotating wind power generation as shown in Figure. 1(b)
Summary
Compared with non-renewable energy, wind energy emerged as the most economical and feasible fast-growing renewable energy source for wind power generation, with an installed capacity of 744 GW by the end of 2020 [1].
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