Variable speed refrigeration system with HPF input rectifier stage

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Canesin, C. A. [UNESP]
Gonçalves, F. A S [UNESP]
Leandro, E. [UNESP]
Pinto, J. O P

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This paper is based on the analysis and implementation of a new drive system applied to refrigeration systems, complying with the restrictions imposed by the IEC standards (Harmonic/Flicker/EMI-Electromagnetic Interference restrictions), in order to obtain high efficiency, high power factor, reduced harmonic distortion in the input current and reduced electromagnetic interference, with excellent performance in temperature control of a refrigeration prototype system (automatic control, precision and high dynamic response). The proposal is replace the single-phase motor by a three-phase motor, in the conventional refrigeration system. In this way, a proper control technique can be applied, using a closed-loop (feedback control), that will allow an accurate adjustment of the desirable temperature. The proposed refrigeration prototype uses a 0.5Hp three-phase motor and an open (Belt-Drive) Bitzer IY type compressor. The input rectifier stage's features include the reduction in the input current ripple, the reduction in the output voltage ripple, the use of low stress devices, low volume for the EMI input filter, high input power factor (PF), and low total harmonic distortion (THD) in the input current, in compliance with the IEC61000-3-2 standards. The digital controller for the output three-phase inverter stage has been developed using a conventional voltage-frequency control (scalar V/f control), and a simplified stator oriented Vector control, in order to verify the feasibility and performance of the proposed digital controls for continuous temperature control applied at the refrigerator prototype. ©2008 IEEE.



HPF rectifier, Power quality, Variable speed refrigeration system, Automation, Capillary tubes, Concurrency control, Control system analysis, Control systems, Control theory, Digital arithmetic, Digital control systems, Drives, Dynamic response, Electric power factor, Electric power factor correction, Electromagnetic compatibility, Electromagnetic pulse, Electromagnetic wave interference, Electromagnetism, Harmonic distortion, Induction motors, Industrial engineering, Information theory, Motors, Power electronics, Refrigerating machinery, Refrigeration, Refrigerators, Regulatory compliance, Signal interference, Stages, Standards, Temperature control, Wave filters, Automatic control, Closed loops, Control techniques, Digital controllers, Digital controls, Drive systems, Electrical drives, Electro magnetic interferences, Excellent performance, Frequency controls, High input power, High power factors, High-efficiency, IEC standards, Input current ripple, Input currents, International symposium, Low-stress, Output voltage ripple, Phase motors, Prototype systems, Refrigeration systems, Temperature controlling, Three-phase inverters, Three-phase motors, Total Harmonic Distortion, V/F control, Variable speed, Vector controls, Electric rectifiers

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SPEEDAM 2008 - International Symposium on Power Electronics, Electrical Drives, Automation and Motion, p. 848-853.