Page 28 - Power Quality in Electrical Systems

Introduction 11

Chapter 7, Switch Mode Power Supplies, discusses switching power
supplies that are incorporated in every personal computer, server,
industrial controllers, and other electronic equipment, and which
create high-frequency components that result in electromagnetic inter-
ference (EMI).
Chapter 8, Methods for Correction of Power-Quality Problems, is a pre-
liminary look at methods for design of equipment and supply sys-
tems to correct for effects of poor power quality.
Chapter 9, Uninterruptible Power Supplies, discusses the most widely
employed equipment to prevent poor power quality of the supply
system from affecting sensitive loads.
Chapter 10, Dynamic Voltage Compensators, is a description of low-
cost equipment to prevent the most frequent short-time line-voltage
dips from affecting sensitive equipment.
Chapter 11, Power-Quality Events, discusses how power-quality
events, such as voltage sags and interruptions affect personal com-
puters and other equipment.
Chapter 12, Adjustable Speed Drives (ASDs) and Induction Motors,
discusses major three-phase power-electronic equipment that both
affect power quality and are affected by poor power quality.
Chapter 13, Standby Power Systems, consisting of UPSs, discusses
engine-generator and transfer switches to supply uninterrupted power
to critical loads such as computer data centers.
Chapter 14, Measurements, discusses methods and equipment for
performing power-quality measurements.

Comment on References

The business of electrical engineering is to, first, provide “clean” unin-
terrupted electric power to all customers and, second, to design and
manufacture equipment that will operate with the actual power deliv-
ered. As such, practically all of the electrical engineering literature
bears on power quality. A group of pertinent references is given at the
end of this chapter and in the following chapters of the book. Two impor-
tant early references that defined the field are the following:

■ “IEEE Recommended Practice for Emergency and Standby Power
Systems for Industrial and Commercial Applications,” (The Orange
Book), IEEE Std. 446-1995 [1.20]
■ “IEEE Recommended Practices and Requirements for Harmonic
Control in Electrical Power Systems,” IEEE Std. 519-1992, revision
of IEEE Std. 519-1981 [1.21]