Compare advanced PWM techniques for voltage source inverters.

Advanced modulation techniques include: SVPWM (space vector - 15% higher voltage utilization, lower harmonics), DPWM (discontinuous PWM - reduces switching losses by 33% by clamping one phase), random PWM (spreads EMI spectrum), selective harmonic elimination (calculates switching angles to eliminate specific harmonics), and hybrid modulation (combines fundamental frequency switching with PWM). Selection criteria include: efficiency (minimize switching losses), harmonics (meet IEEE 519, motor derating), acoustic noise, EMI, and control complexity. Modern drives adaptively select modulation based on operating point.