Power Electronics Handbook: Devices, Circuits and Applications, Second Edition

Chapter 34: Control Methods for Switching Power Converters

J. Fernando Silva, Ph.D. Pinto, Ph.D. S nia Ferreira,
Instituto Superior T cnico, DEEC, A.C. Energia, Laborat rio de M quinas El ctricas e Electr nica de Pot ncia, Centro de Autom tica da Universidade T cnica de Lisboa, AV. Rorisco Pais 1, 1049 001
Lisboa,Portugal

34.1 Introduction

Switching power converters must be suitably designed and controlled in order to supply the voltages, currents, or frequency ranges needed for the load and to guarantee the requested dynamics [1-4]. Furthermore, they can be designed to serve as "clean" interfaces between most loads and the electrical utility system. Thereafter, the set switching converter plus load behaves as an almost pure electrical utility resistive load.

This chapter provides basic and some advanced skills to control electronic power converters, taking into account that the control of switching power converters is a vast and interdisciplinary subject. Control designers for switching converters should know the static and dynamic behavior of the electronic power converter and how to design its elements for the intended operating modes. Designers must be experts on control techniques, especially the nonlinear ones, since switching converters are nonlinear, time-variant, discrete systems, and designers must be capable of analog or digital implementation of the derived modulators, regulators, or compensators. Powerful modeling methodologies and sophisticated control processes must be used to obtain stable-controlled switching converters, not only with satisfactory static and dynamic performance, but also with low sensitivity against load or line disturbances or, preferably, robustness.

In Section 34.2, the techniques to obtain suitable nonlinear and linear state-space models, for most switching converters, are...

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