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This book is a technical publication for students, scholars and
engineers in electrical engineering, focusing on the
pulse-width-modulation (PWM) technologies in power electronics
area. Based on an introduction of basic PWM principles this book
analyzes three major challenges for PWM on system performance:
power losses, voltage/current ripple and electromagnetic
interference (EMI) noise, and the lack of utilization of control
freedoms in conventional PWM technologies. Then, the model of PWM's
impact on system performance is introduced, with the current ripple
prediction method for voltage source converter as example. With the
prediction model, two major advanced PWM methods are introduced:
variable switching frequency PWM and phase-shift PWM, which can
reduce the power losses and EMI for the system based on the
prediction model. Furthermore, the advanced PWM can be applied in
advanced topologies including multilevel converters and paralleled
converters. With more control variables in the advanced topologies,
performance of PWM can be further improved. Also, for the special
problem for common-mode noise, this book introduces modified PWM
method for reduction. Especially, the paralleled inverters with
advanced PWM can achieve good performance for the common-mode noise
reduction. Finally, the implementation of PWM technologies in
hardware is introduced in the last part.
This book is a technical publication for students, scholars and
engineers in electrical engineering, focusing on the
pulse-width-modulation (PWM) technologies in power electronics
area. Based on an introduction of basic PWM principles this book
analyzes three major challenges for PWM on system performance:
power losses, voltage/current ripple and electromagnetic
interference (EMI) noise, and the lack of utilization of control
freedoms in conventional PWM technologies. Then, the model of PWM's
impact on system performance is introduced, with the current ripple
prediction method for voltage source converter as example. With the
prediction model, two major advanced PWM methods are introduced:
variable switching frequency PWM and phase-shift PWM, which can
reduce the power losses and EMI for the system based on the
prediction model. Furthermore, the advanced PWM can be applied in
advanced topologies including multilevel converters and paralleled
converters. With more control variables in the advanced topologies,
performance of PWM can be further improved. Also, for the special
problem for common-mode noise, this book introduces modified PWM
method for reduction. Especially, the paralleled inverters with
advanced PWM can achieve good performance for the common-mode noise
reduction. Finally, the implementation of PWM technologies in
hardware is introduced in the last part.
Sustainable Crop Productivity and Quality under Climate Change:
Responses of Crop Plants to Climate Change explores the
physiological, biochemical, and molecular basis of the responses of
major crop plants to a range of climate change scenarios. From the
development of climate-resilient crop varieties which lead to
enhanced crop productivity and quality to better utilization of
natural resources to ensure food security through modern breeding
techniques, it presents insights into improving yield while
securing the environment. Understanding the impact of climate on
crop quality and production is a key challenge of crop science.
Predicted increases in climate variability necessitate crop
varieties with intrinsic resilience to cooccurring abiotic stresses
such as heat, drought, and flooding in a future climate of elevated
CO2. This book presents a much-needed mechanistic understanding of
the interactions between multiple stress responses of plants that
is required to identify and take advantage of acclimation traits in
major crop species as a prerequisite for securing robust yield and
good quality. This book is an excellent reference for crop and
agricultural scientists, plant scientists, and researchers working
on crop plant ecophysiology/stress physiology and future crop
production.
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