Title:
VARIABLE SPEED DRIVE SYSTEM, METHOD FOR OPERATING A VARIABLE SPEED DRIVE SYSTEM AND METHOD FOR REFRIGERATING A HYDRCARBON STREAM
Document Type and Number:
WIPO Patent Application WO/2014/033201
Kind Code:
A3
Abstract:
A variable speed drive system employing an electric motor and a frequency converter arranged between an AC power source and the electric motor is operated. The frequency converter functions to convert AC power obtained from the AC power source at a source frequency to converted power at a variable drive frequency. A mechanical assembly can be coupled to the electric motor. Electric modulation circuitry is provided interacting with the frequency converter. It is arranged to impose fluctuations, independently from any torsional excitation in the mechanical assembly and the AC power source, in the inter-harmonic frequencies of inter-harmonic currents generated in the frequency converter.
Inventors:
VERHULST MICHEL PIETER ALFONS (NL)
Application Number:
PCT/EP2013/067870
Publication Date:
October 30, 2014
Filing Date:
August 29, 2013
Export Citation:
Assignee:
SHELL INT RESEARCH (NL)
SHELL OIL CO (US)
SHELL OIL CO (US)
International Classes:
H02P29/00; H02P23/04
Domestic Patent References:
WO2011121049A1 | 2011-10-06 |
Foreign References:
US20060244425A1 | 2006-11-02 | |||
US20060232250A1 | 2006-10-19 | |||
DE10326816A1 | 2005-01-13 | |||
US20080141711A1 | 2008-06-19 |
Attorney, Agent or Firm:
MATTHEZING, Robert, Maarten (HR The Hague, NL)
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