DC‐AC Converter Modulation Techniques

This chapter discusses AC‐DC converter structures and their modulation techniques. In general, DC‐AC converters are of two types: current source converter and voltage source converter. The chapter presents schematic diagram of a single‐phase converter. It is called an H‐bridge converter as it looks like the eighth letter of the English alphabet (H). Hysteresis control is the simplest form of current control. In this, the H‐bridge converter is required to track a reference current. The chapter then provides the schematic diagram of a three‐phase full‐bridge converter. This contains six switches, each consisting of a power semiconductor device and an antiparallel diode. Space vector modulation is essentially an averaging technique which takes into consideration that a three‐phase inverter has only eight switch states.