References of "Chen, Qiongzhong"
     in
Bookmark and Share    
Full Text
See detailA Newmark-type integrator for flexible systems considering nonsmooth unilateral constraints
Chen, Qiongzhong ULg; Acary, Vincent; Virlez, Geoffrey ULg et al

in Proceedings of the First Joint International Conference on Multibody System Dynamics (2012, June)

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this ... [more ▼]

Mechanical systems are usually subjected not only to bilateral constraints but also to unilateral constraints. Inspired by the HHT time integration method for smooth flexible multibody dynamics, this paper presents a Newmark-type integrator, denoted by nonsmooth HHT method, to include the nonsmooth property of unilateral constraints. Through numerical examples accounting for both rigid and flexible body models, a bunch of methods are compared with the unilateral constraints on both velocity level and position level. Results show that the presented nonsmooth HHT method benefits from the accuracy and stability property of the classical HHT method with controllable numerical damping. In particular, when it comes to the analysis of flexible systems, the nonsmooth HHT method shows much better accuracy property than that of the other methods, including the Moreau–Jean time-stepping method and the fully implicit Newmark methods. [less ▲]

Detailed reference viewed: 55 (20 ULg)
Full Text
Peer Reviewed
See detailIntegrated control and structural analysis of DFIG wind turbines using a monolithic approach
Chen, Qiongzhong ULg; D'Ambrosio, Flavio; Defourny, Michel et al

in Proceedings of the European Wind Energy Conference and Exhibition 2012 (EWEA 2012) (2012, April)

Design of wind turbines requires the coupled analysis among the mechanical, control and aerodynamic subsystems. Different from previous research, which either uses a complicated mechanical model with a ... [more ▼]

Design of wind turbines requires the coupled analysis among the mechanical, control and aerodynamic subsystems. Different from previous research, which either uses a complicated mechanical model with a simple control system model, or vice versa, this paper studies the coupling of subsystems’ dynamics using a high-fidelity aeroelastic model of wind turbine and a detailed analytical model of control generating systems. A monolithic time integration approach is applied so that better numerical accuracy and stability are achieved. Control strategies on power optimization are discussed taking into account the influence of structural flexibility. Simulation examples are given on both stable and turbulent wind situation. [less ▲]

Detailed reference viewed: 63 (11 ULg)
Full Text
Peer Reviewed
See detailIntegrated power control analysis of DFIG wind turbines considering structural flexibility
Chen, Qiongzhong ULg; Bruls, Olivier ULg

in Proceedings of the ASME 2011 International Design Engineering Technical Conference & Computers and Information in Engineering Conference IDETC/CIE 2011 (2011, August)

Doubly-fed induction generators (DFIGs) are commonly used in variable-speed wind turbines for more power extraction. Unlike previous research on DFIG wind turbines, which typically uses an equivalent ... [more ▼]

Doubly-fed induction generators (DFIGs) are commonly used in variable-speed wind turbines for more power extraction. Unlike previous research on DFIG wind turbines, which typically uses an equivalent lumped mass model of the drive train dynamics, but does not include detailed aerodynamic/mechanical representations, this paper investigates on the modelling and control of DFIG wind turbines by following a systematic approach based on a flexible multibody simulation software. The wind turbine structure, generator and control subsystem models are modularly developed for the S4WT package (Samcef for Wind Turbines), which is a user interface for the analysis of wind turbines. An extension of the finite element method is available in the flexible multibody dynamics solver, for the representation of the non-mechanical components, i.e., the generator and the control system, so that the coupled mechatronic system is simulated in a strongly coupled way. This integrated approach is less intricate and more robust than approaches based on an external DLL or co-simulation methods. The objective of this work is to analyze the control-generator-structure interactions in a wind turbine system. The power optimization control is elaborated in detail. A 2MW DFIG wind turbine prototype model is presented for validation. Dynamic analysis including the control effects and the influence of the structural flexibility is provided in an overall range. [less ▲]

Detailed reference viewed: 38 (9 ULg)
Full Text
See detailAnalysis of Control-Generator-Structure Interactions in Wind Turbines using an Integrated Simulation Approach
Bruls, Olivier ULg; Cugnon, Frédéric; Defourny, Michel et al

in Proceedings of Multibody Dynamics ECCOMAS Conference (2011, July)

This paper addresses the modelling of the interactions between the generator, the controller and the structural components in wind turbines. Those interactions have a direct influence on the mechanical ... [more ▼]

This paper addresses the modelling of the interactions between the generator, the controller and the structural components in wind turbines. Those interactions have a direct influence on the mechanical loads, which need to be evaluated for the design of the machine. Using the sofware Samcef For Wind Turbines, a model is developed which includes a description of the aeroelastic behaviour of the blades, the gearbox dynamics, the tower flexibility, as well as the electrical and control parts. Electrical and control subsystems can be modelled either by linking an external DLL, by a co-simulation approach or by using an integrated and monolithic model. This paper shows that the monolithic approach can be exploited for the reliable analysis of electrical-control-structure interactions in wind turbines. Non-mechanical elements are represented in a modular way using a newly developed library of block diagram elements. The coupled equations of motion are established by numerical assembly and they include a finite element description of the mechanical components and a block diagram description of the generator and its control system. A fully implicit, stable and reliable solver is then exploited to solve the coupled equations of motion. Simulation results are presented for a 2 MW wind turbine with a doubly-fed induction generator and they illustrate the coupling between the power control system and the dynamic structural response. [less ▲]

Detailed reference viewed: 51 (15 ULg)
Full Text
Peer Reviewed
See detailControl and simulation of doubly fed induction generator for variable speed wind turbine systems based on an integrated finite element approach
Chen, Qiongzhong ULg; Defourny, Michel; Bruls, Olivier ULg

in Proceedings of the European Wind Energy Conference and Exhibition 2011 (EWEA 2011) (2011, March)

Regarding renewable energy and environment- friendly issues, wind energy nowadays has become the fastest-growing energy source in the world, and thus attracts a lot of research interest in the wind ... [more ▼]

Regarding renewable energy and environment- friendly issues, wind energy nowadays has become the fastest-growing energy source in the world, and thus attracts a lot of research interest in the wind turbine generation system. A doubly fed induction generator (DFIG) is used for variable speed operation in a wind turbine system to extract more power. Following a systematic approach, this paper investigates on the modelling and simulation of wind turbine generating systems using the flexible multibody simulation software SAMCEF/MECANO [1]. The objective of this work is to analyze the control-generator-structure interactions in a wind turbine system. Firstly, an extension of the finite element method is integrated into the flexible multibody dynamics solver, and thus extends the solver to represent mechatronic systems in a strongly-coupled way. Secondly, DFIG and the control systems are modularly modeled for the wind turbine package. Control of DFIG for grid synchronization and power optimization are elaborated in detail, and the methods are validated through a 2MW DFIG wind turbine prototype model. At the end, a systematic system model of wind turbine structure connected with the DFIG generating system is presented, which provides the dynamic analysis for the whole system in an overall range. [less ▲]

Detailed reference viewed: 115 (13 ULg)
Full Text
See detailModular mechatronic modelling for wind turbine generating systems based on an integrated finite element approach
Chen, Qiongzhong ULg; Jetteur, Philippe; Bruls, Olivier ULg

in Proceedings of the First Joint International Conference on Multibody System Dynamics (2010, May)

Wind energy is nowadays the fastest-growing energy source in the world, which has been attracting a lot of research interest in wind turbine generator systems. This paper concerns the modelling and ... [more ▼]

Wind energy is nowadays the fastest-growing energy source in the world, which has been attracting a lot of research interest in wind turbine generator systems. This paper concerns the modelling and simulation of wind turbine generating systems using the flexible multibody simulation software SAMCEF/MECANO. Firstly, it introduces the formulation of an extension of the generalized-alpha method, which is integrated into the flexible multibody dynamics solver for strongly-coupled simulation of mechatronic systems, and then emphasizes on the doubly-fed induction generator (DFIG) and the controller models, which are developed as modular components of the wind turbine package. The mechatronic systems are simulated upon this strongly-coupled approach and simulation results show the validity of the newly-developed solver and the models. The interest of this work is to analyze the control-generator-structure interactions in a wind turbine. The general aim is to develop a computer-aided tool for customization, fast-prototyping and optimal design of wind turbine systems based on the dynamic simulation of the overall system. [less ▲]

Detailed reference viewed: 90 (32 ULg)