ABOUT THE AUTHORS
Michael J.
Basler graduated in 1979 with a
B.S.E.E. and in 1989 with an M.S.E.E. from
the University of Missouri at Rolla. From
1979 to 1981 he worked at Emerson Electric
Company in St. Louis, Missouri, on
automated, two-way communications systems
for Electric Utilities. He has been working
at Basler Electric Company in Highland,
Illinois, since 1981 in various design and
engineering management positions related to
the field of synchronous machine excitation
systems. He is currently Manager of
Electrical Engineering for the Power Systems
Group. He is also an Adjunct Lecturer at
Southern Illinois University at Edwardsville
in the Electrical and Computer Engineering
Department. Basler is the past chairman of
the Excitation System and Controls
Subcommittee and currently the Secretary of
the Energy Development and Power Generation
Committee of the IEEE/PES Energy Development
and Power Generation Committee.
Arjun Godhwani
graduated in 1963 with a B.S.E.E. from
Vikram University in India, in 1965 with
M.S.E.E. from Roorkee University in India,
and in 1971 with a Ph.D. from University of
Arkansas. From 1966 to1968 he worked as an
Instructor in the department of EE at BITS
Pilani India. He joined the faculty of
engineering at SIUE in the Fall of 1972 and
retired there in 2001 as a professor and
Graduate Program Director for Electrical
Engineering. He developed and taught
undergraduate and graduate courses in
Control Systems, Signals and Systems, and
Circuit Analysis. He consulted with
McDonnell Douglas Corp. from 1977 to 1992,
and with Basler Electric from 1993-2007. He
was an active member of the Excitation
System and Controls Subcommittee of the
IEEE/PES Energy Development and Power
Generation Committee from 1995-2007. He has
written a chapter in IEEE tutorial for Power
System Stabilization 2009. He has a number
of publications and presentations.
Pranesh Rao
received the B.E. degree in electrical
engineering in 1993 from Bangalore
University, India, and the M.S.E.E. degree
in 1997 from the University of
Missouri-Rolla. He worked at Larsen & Toubro
in Bombay, India, from 1993 to 1995. From
1997 to 1999, he was with Sprint in Kansas
City, Missouri. Since 1999 he has worked at
Basler Electric Company, in Highland,
Illinois, where he concentrates on research,
modeling and product development in the
areas of generator excitation controls,
protective relays and genset controllers. He
is currently a Principal Engineer in the
Technology Development Department of the
Power Systems Group. He is a member of IEEE.
Jeffrey A.
Burnworth graduated from the
University of Missouri at Rolla with a
Bachelor of Science degree in Electrical
Engineering in 1976. Since 1977 he has
worked at Basler Electric in Highland,
Illinois, in various design and engineering
management positions. He is presently the
Manager of Technology Development
Engineering. Jeff is a member of the
IEEE/PSRC, past chairman of the Electrical
Environmental Subcommittee, and actively
involved in several standards development
working groups. He is a member of the
Industrial and Professional Advisory Council
(IPAC) at Southern Illinois University at
Edwardsville (SIUE).
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BOOK EXCERPT
As semiconductor
technology advanced, rectifier diodes were
produced with sufficient voltage and current
ratings to allow the use of synchronous ac
generators, or alternators, to provide the
excitation power for the main field. These
are known as Alternator Supplied Rectifier
Exciter
s and are
seen in Fig. 7.5. In some applications, the
rectifying diodes are stationary, requiring
brushes
and slip
rings
to extract the power from the rotary
exciter and to provide power to the rotating
main field. In other applications, the
rectifiers are mounted on the shaft and the
rotating exciter is an “inside out”
synchronous generator, making this a
“brushless” excitation system. In the
brushless configuration, the exciter field
is stationary and the exciter armature is
rotating on the main shaft. The output of
the exciter armature is alternating current,
which is rectified by the rotating diodes
and provided to the main field without the
use of brushes or slip rings. These devices
inherently require less maintenance. The
vast majority of machines above 15kW utilize
brushless excitation systems.
Figure 7.5: Alternator Supplied Rectifier
Exciter
The exciter output
may be single or multiple-phase. In many
cases, three or more phases are used to
provide ac power to the rectifiers. The
electrical frequency of the rotating exciter
may be higher than the main generator. Since
the exciter and main generator typically are
mounted on the same shaft, this is
accomplished by using an exciter with more
poles than the main generator. Higher
frequency exciters are used to reduce their
size and cost.
The field of the
rotating ac exciter is powered by a separate
source. This separately excited machine
receives exciter field power from a pilot
exciter or directly from the automatic
voltage regulator (AVR). If supplied from
the machine’s terminals, then buildup of
voltage occurs as long as the voltage
produced by residual magnetism is great
enough for the AVR to boot strap itself up.
Taken from - Excitation Control
Systems
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