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Energy savings using ac drives [autosaved]
- 1. prashob7@outlook.com Energy Savings Using AC Drives Drive Selection level Presentation by Prashob P K in.linkedin.com/in/prashob7
- 2. prashob7@outlook.com Introduction Energy Savings is getting more and more importance in current scenario We have to effectively configure suitable drives with adequate configuration Selection and configuration of suitable drives based on application or load is also critical
- 3. prashob7@outlook.com Design and Selection Savings can be achieved by : • Use of common DC bus architecture • Utilizing AFE [Active Front End] • Use of Direct drives thereby reduce mech. Loss • Optimizing and Tuning • Retrofitting Older DC drives • Use of energy efficient and inverter duty motors
- 4. prashob7@outlook.com AC/AC Coordinated Drive Line Up ~ ~ = M 3~ ~ ~ = M 3~ ~ ~ = M 3~ ~ ~ = M 3~ ~ ~ = M 3~ Fuses Line Reactor Contactor AC Drive Regenerating Resistor AC Motor Ac power supply Explanation in next slide
- 5. prashob7@outlook.com AC/AC Coordinated Drive Line Up • Implemented in multi axis coordinated drive system • Individual drive connected to ac line with separate protective components • Losses are high. • In some cases Pseudo-Common DC bus created , but its costly and inefficient
- 6. prashob7@outlook.com Common DC Bus Coordinated Drive Line Up ~ = M 3~ ~ = M 3~ ~ = M 3~ ~ = M 3~ ~ = M 3~ ~ = Common DC Bus AC Line Inverters Rectifier [Infeed] Regen. Resistor Fuses Line Reactor Contactor Explanation in next slide
- 7. prashob7@outlook.com Common DC Bus Coordinated Drive Line Up • Shared Rectifier used for all drives, losses are less • Rectifier sized based on max current drawn of the system, not the summation of individual motors • Power sharing now possible between each drive sections • More optimized and effective design possible for line components,
- 8. prashob7@outlook.com AFE: Active Front End Technology • AFE is IGBT based rectifier that controls/regulates DC bus level for both over and under voltage • AFE allows input voltage and current waveform to be sinusoidal, thereby reduce harmonics being regenerated to the line • AFE improves the power factor to great extend
- 9. prashob7@outlook.com Line current diode bridge vs. AFE rectifier motoring generating DC link Auto Transformer Line Current Line Current DC link Conventional rectifier system AFE Rectifier system
- 10. prashob7@outlook.com Eliminating Mechanical Losses • Energy mainly lost through friction and mechanical inefficiency • Losses can be reduced by eliminating gearboxes with direct Drive Torque motors • High ratio multistage gear system can be completely replace by shaft mounted torque motors • Replacement of pneumatic, electromechanical tension controls brake with AC drives are now common
- 11. prashob7@outlook.com Retrofit of DC drives with AC/Servo Drives • Now that advanced speed control options are available for AC motors, Existing old DC drive systems can be replaced • DC motors are bulky, and requires maintenance for brushes and all. • With servo drives constant and precise speed control now achievable.
- 12. prashob7@outlook.com Optimization and Adaptive tuning • New age AC drives are capable of auto tuning • Auto tuning helps in improving internal closed control loop gain and thus more stable and efficient will the operation of the drive • Certain drives are capable of adaptive tuning where the gain is continuously adjusted to meet the load requirements while running