Performance analysis of a novel planetary speed increaser used in single-rotor wind turbines with counter-rotating electric generator

Săulescu, Radu; Neagoe, Mircea; Munteanu, Olimpiu; Cretescu, Nadia

doi:10.1088/1757-899x/147/1/012090

Cited by 7 publications

(13 citation statements)

References 15 publications

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“…The stationary operating point of a wind system of the type: two CRWR-1 DOF speed increaser-CREG, Figures 1 and 2, can be determined if the transmitting functions of the speed increaser are known: three kinematic functions, relations (17), (20), and (24) and 1 function for torques, relation (33), the mechanical characteristics of the two wind rotors and the mechanical characteristic of the equivalent electric generator. The equality relation in absolute value between the torques of the rotor GR and the stator GS, according to Equation (16), is added to the previous seven independent equations.…”

Section: Operating Pointmentioning

confidence: 99%

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

2019

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The improvement of wind turbine performance poses a constant challenge to researchers and designers in the field. As a result, the literature presents new concepts of wind turbines (WTs), such as: counter-rotating wind turbines (CRWTs) with two coaxial wind rotors revolving in opposite directions, WTs with higher-efficiency and downsized transmission systems, or WTs with counter-rotating electric generators (CREGs). Currently, there are a few solutions of WTs, both containing counter-rotating components; however, they can only be used in small-scale applications. Aiming to extend the use of WTs with counter-rotating wind rotors (CRWRs) and CREGs to medium- and large-scale applications, this paper introduces and analyzes a higher-performance WT solution, which integrates two counter-rotating wind rotors, a 1 degree of freedom (DOF) planetary speed increaser with four inputs and outputs, and a counter-rotating electric generator. The proposed system yields various technical benefits: it has a compact design, increases the output power (which makes it suitable for medium- and large-scale wind turbines) and allows a more efficient operation of the electric generator. The kinematic and static computing methodology, as well as the analytical models and diagrams developed for various case studies, might prove useful for researchers and designers in the field to establish the most advantageous solution of planetary speed increasers for the CRWTs with CREGs. Moreover, this paper extends the current database of WT speed increasers with an innovative concept of 1 DOF planetary gearbox, which is subject to a patent application.

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Section: Operating Pointmentioning

confidence: 99%

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

2019

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“…(a) R is connected to a one DOF speed increaser, A, with two outputs: one for the GR, and the other for the GS (Figure 5c) [25,52]. (b) R1 and R2 are connected through a one DOF or two DOF speed increaser, A, with two outputs to the GR and GS ( Figure 5d) [24,[26][27][28]53,54].…”

Section: IImentioning

confidence: 99%

“…In regard to the gearbox for WT conversion systems, several types of speed increasers are presented in the literature: spur or bevel gear trains [6,20,21], planetary gear train or combined solutions [16,[22][23][24][25][26][27][28][29][30][31][32][33], variable-ratio gearboxes [34] and a hybrid transmission including a planetary gear train and a control system, designed for a variable-speed WT [35]. The dynamic behavior of a combined planetary and spur gear type speed increaser under different internal and external excitations, based on a four degrees of freedom (DOF) dynamic model, is presented in [36].…”

Section: Introductionmentioning

confidence: 99%

“…One recent solution features a wind turbine with higher output speed and compact design which includes a counter-rotating electric generator (i.e., the inner and the outer armatures rotate in opposite directions) [1,25,38]. However, this type of WT has a relatively low capacity and, therefore, it is mainly implemented in urban environments.…”

Section: Introductionmentioning

confidence: 99%

“…(a) the wind rotor (R) is connected to the generator rotor (GR) through a one degree of freedom (one DOF) speed increaser, A (Figure 5a) [5,25,49]. (b) two counter-rotating wind rotors, R1 and R2, are connected to the generator rotor, GR, through a one DOF [50] or a two DOF [16,23,26,[29][30][31][32]51] speed increaser, A (Figure 5b).…”

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confidence: 99%

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Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems

2018

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Most wind turbines (WT) are of the single-rotor type, which means they are simple, reliable and durable, but unlikely to convert more than 40% of the available wind energy. Different solutions are proposed to minimize WT energy loss and improve performance, such as the use of speed increasers, counter-rotating wind rotors or counter-rotating electric generators. Downsizing the design, saving weight and reducing the cost of WT conversion systems, while increasing their efficiency, have posed constant challenges to WT designers. Nevertheless, very little research in the field is concerned with, and partially recommends, the design of conversion systems. Therefore, the aim of this paper is to propose a specific algorithm for the conceptual synthesis of speed increasers integrated in WT conversion systems, starting with an inventory of all combinations of the main components of a conversion system that prove compatible for efficient functioning. The algorithm is structured in two sections: the first one includes a four-step approach to WT system design, while the second one follows a three-step procedure for identifying the speed increaser concept. Twenty-two variants of speed increasers are further generated and analyzed, four of which are innovative solutions proposed by the authors. The paper also provides guidelines for identifying the WT conversion system concept according to the circumstances of its application.

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Efficiency Analysis of a Planetary Speed Increaser for Wind Turbines with Counter-Rotating Versus Fixed-Stator Electric Generator

Neagoe

Săulescu

Jaliu

et al. 2020

2020 7th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE)

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Performance analysis of a novel planetary speed increaser used in single-rotor wind turbines with counter-rotating electric generator

Cited by 7 publications

References 15 publications

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

Design and Simulation of a 1 DOF Planetary Speed Increaser for Counter-Rotating Wind Turbines with Counter-Rotating Electric Generators

Conceptual Synthesis of Speed Increasers for Wind Turbine Conversion Systems

Efficiency Analysis of a Planetary Speed Increaser for Wind Turbines with Counter-Rotating Versus Fixed-Stator Electric Generator

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