Page 225 - Power Electronics Handbook

Performance factors 215

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m

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0 20 40 60 80 100
Harmonic as percentage of max. d.c. output
Figure 9.40 Predominant harmonics in the output of a single-phase half-controlled bridge
converter

Harmonic as percentage of max. d.c. output
F@m 9.41 Predominant harmonics in the output of a three-phase half-controlled bridge
converter

V,, is composed of a d.c. voltage V,, plus a spectrum of harmonic voltages
of magnitude VI, V,, V3, etc. If Vh is defined by equation (9.u)), then the
r.m.s. voltage is given by equation (9.21), which gives the value of
harmonic voltage as in equation (9.22). Therefore the harmonic factor Hf,