Title:
METHOD FOR BOOSTING THE OUTPUT VOLTAGE OF A VARIABLE FREQUENCY DRIVE
Document Type and Number:
WIPO Patent Application WO2001089068
Kind Code:
A3
Abstract:
A sine wave filter including an inductor for each phase (three inductors) and three delta- or Y-connected capacitors is employed within a borehole power system, coupled within a three phase power system at the surface between the output of a variable frequency drive and a three phase power cable transmitting power to a borehole location, and boosts the output voltage of the drive. The sine wave filter is designed to have a resonant frequency higher than the maximum operational frequency of the drive, and a Q such that, at the maximum operational frequency of the drive, the filter provides a voltage gain equal to the ratio of the desired voltage to the drive's maximum output power at the maximum operational frequency. The sine wave filter also smooths the voltage waveform of a pulse width modulated variable frequency drive.
Inventors:
RIDER JERALD
LAYTON JAMES E
LEUTHEN JOHN M
KNOX DICK L
LAYTON JAMES E
LEUTHEN JOHN M
KNOX DICK L
Application Number:
PCT/US2001/015249
Publication Date:
March 14, 2002
Filing Date:
May 11, 2001
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
E21B43/12; F04B47/06; (IPC1-7): H02M7/5387; F04D13/08
Foreign References:
| US5208738A | 1993-05-04 | |||
| EP0413514A2 | 1991-02-20 | |||
| US4928771A | 1990-05-29 | |||
| US4541041A | 1985-09-10 |
Other References:
FUJITA H ET AL: "A ZERO-CURRENT-SWITCHING BASED THREE-PHASE PWM INVERTER HAVING RESONANT CIRCUITS ON AC-SIDE", CONFERENCE RECORD OF THE INDUSTRY APPLICATIONS CONFERENCE IAS ANNUAL MEETING. TORONTO, OCT. 3 - 8, 1993, NEW YORK, IEEE, US, vol. PART 2 MEETING 28, 3 October 1993 (1993-10-03), pages 821 - 826, XP000419541
HABETLER T G ET AL: "DESIGN AND IMPLEMENTATION OF AN INVERTER OUTPUT LC FILTER USED FOR DV/DT REDUCTION", APEC '99. 14TH ANNUAL APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION. DALLAS, TX, MARCH 14 - 18, 1999, ANNUAL APPLIED POWER ELECTRONICS CONFERENCE, NEW YORK, NY: IEEE, US, vol. 2, 14 March 1999 (1999-03-14), pages 1279 - 1286, XP001004164, ISBN: 0-7803-5161-4
HABETLER T G ET AL: "DESIGN AND IMPLEMENTATION OF AN INVERTER OUTPUT LC FILTER USED FOR DV/DT REDUCTION", APEC '99. 14TH ANNUAL APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION. DALLAS, TX, MARCH 14 - 18, 1999, ANNUAL APPLIED POWER ELECTRONICS CONFERENCE, NEW YORK, NY: IEEE, US, vol. 2, 14 March 1999 (1999-03-14), pages 1279 - 1286, XP001004164, ISBN: 0-7803-5161-4
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