The purpose of this paper is to analyse torsional vibrations of the electromechanical systems composed by compression trains based on reciprocating compressor and induction motor. Since reciprocating compressors produce large fluctuating torques, the dynamic interaction between electrical and mechanical system causes natural frequencies modification and, consequently, torque amplification of the mechanical system, different from that calculated neglecting air-gap effect. The air-gap effect is studied starting from the development of an electromechanical model in MATLAB/Simulink environment. Electrical and mechanical model interact each other with their input/output in order to simulate the real torsional vibration of the compression train. Using state-space representation, the multi-physics model has been implemented including stator and rotor magnetic fluxes in the space-vector. Since the electromechanical system is described by non-linear differential equations, the model has been linearized around the steady and transient state operating point. Using this method, the natural frequencies changes with the linearization point so it is possible to analyse the system during both starting and steady conditions. According to API 618, the torsional analysis has been completed studying the electrical faults such as three-phase or two-phase short circuit. Finally, a dedicated tool, programmed in MATLAB environment, has been developed to avoid errors and reduce time needed for torsional analysis.
Electro-mechanical modelling of a reciprocating compression train driven by induction motor / Fusi, Andrea; Grasso, Francesco; Sambataro, Alessio; Baylon, Alessandro; Pugi, Luca. - ELETTRONICO. - (2017), pp. 0-0. (Intervento presentato al convegno II Torsional Vibration Symposium tenutosi a Salisburgo nel 17-19 maggio 2017).
Electro-mechanical modelling of a reciprocating compression train driven by induction motor
GRASSO, FRANCESCOValidation
;PUGI, LUCAMethodology
2017
Abstract
The purpose of this paper is to analyse torsional vibrations of the electromechanical systems composed by compression trains based on reciprocating compressor and induction motor. Since reciprocating compressors produce large fluctuating torques, the dynamic interaction between electrical and mechanical system causes natural frequencies modification and, consequently, torque amplification of the mechanical system, different from that calculated neglecting air-gap effect. The air-gap effect is studied starting from the development of an electromechanical model in MATLAB/Simulink environment. Electrical and mechanical model interact each other with their input/output in order to simulate the real torsional vibration of the compression train. Using state-space representation, the multi-physics model has been implemented including stator and rotor magnetic fluxes in the space-vector. Since the electromechanical system is described by non-linear differential equations, the model has been linearized around the steady and transient state operating point. Using this method, the natural frequencies changes with the linearization point so it is possible to analyse the system during both starting and steady conditions. According to API 618, the torsional analysis has been completed studying the electrical faults such as three-phase or two-phase short circuit. Finally, a dedicated tool, programmed in MATLAB environment, has been developed to avoid errors and reduce time needed for torsional analysis.File | Dimensione | Formato | |
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