Ride-through method and system for HVACandR chillers

Details Ride-through method and system for HVACandR chillers Ride-through method and system for HVACandR chillers

2006-07-25

2006-07-25

Duda, Rina (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S767000, C318S798000, C318S799000, C318S800000, C318S804000, C318S806000, C318S807000, C318S808000, C318S812000, C318S009000

Reexamination Certificate

active

07081734

ABSTRACT:
A method of providing ride-through capability in a chiller/refrigeration system employs a variable speed drive with an active converter stage, a DC link stage and an inverter stage for providing variable frequency and voltage to power at least one motor. An induction motor is coupled to the output of the inverter stage for driving a compressor in the chiller/refrigeration system. The ride-through method comprises operating the active converter to regulate the DC link voltage of the DC link stage to a predetermined voltage level until the current through the active converter equals a predetermined current limit, then transferring regulation of the DC link to the inverter upon reaching the current limit of the converter. The compressor is unloaded, and the power flow through the inverter is reversed to maintain the voltage level of the DC link stage.

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Annette Von Jouanne, Prasad N. Enjeti, and Basudeb Banerjee; Assessment of Ride-Through Alternatives for Adjustable-Speed Drives; IEEE Transactions on Industry Applications; Jul./Aug. 1999; vol. 35, Issue No. 4.

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