17

Multilevel Converters

17.1    PRINCIPLE AND HARDWARE TOPOLOGIES

We have seen in Chapter 3, Section 3.6.1, that we can approximate a sinusoidal waveform with a staircase waveform as shown in Figure 3.21. The angular intervals for changing the waveform from a step to another and the levels for each step can be optimized by harmonic constraints. However, such dual optimization may be difficult to implement in hardware. Alternatively, levels of equal height may be easier to construct and implement within a modular approach.

17.1.1    H-BRIDGE MODULES

Let us first imagine that each level is created with a single-phase H-bridge converter, working completely independent of the others with the only purpose of creating stair-like levels in accordance ...

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