Voltage Control of Single-Phase Inverters

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Presentation transcript:

Voltage Control of Single-Phase Inverters Commonly-used Techniques Single-Pulse-Width-Modulation Multiple-Pulse-Width-Modulation Sinusoidal-Pulse-Width-Modulation Modified-Sinusoidal-Pulse-Width-Modulation Phase-Displacement Control ECE 442 Power Electronics

Single-Pulse-Width-Modulation ECE 442 Power Electronics

One Pulse per Half-Cycle Pulse Width Controls the Output Voltage ECE 442 Power Electronics

Carrier and Reference Signals Gate Pulse Gate Pulse Compare the Reference Signal with the Carrier Frequency of the Reference Signal determines the frequency of the Output Voltage Modulation Index = M = Ar/Ac ECE 442 Power Electronics

Gate Signals and Output ECE 442 Power Electronics

rms value of the Output Voltage ECE 442 Power Electronics

Fourier Series for the Output Voltage ECE 442 Power Electronics

Times and angles of the intersections Pulse width d (or pulse angle δ) TS = T/2 ECE 442 Power Electronics

Harmonic Profile ECE 442 Power Electronics

Multiple-Pulse-Width-Modulation ECE 442 Power Electronics

Multiple Pulses per Half-Cycle of Output Voltage ECE 442 Power Electronics

Gate Signal Generation Compare the Reference Signal with the Carrier Frequency of the Reference Signal determines the Output Voltage Frequency Frequency of the Carrier determines the number of pulses per half-cycle Modulation Index controls the Output Voltage ECE 442 Power Electronics

Gate Signals and Output Voltage Number of pulses per half cycle = p = fc/2fo = mf /2 where mf = frequency modulation ratio ECE 442 Power Electronics

rms Value of the Output Voltage ECE 442 Power Electronics

Fourier Series of the Output Voltage ECE 442 Power Electronics

The times and angles of the intersections The pulse width d (or pulse angle δ) TS = T/2p ECE 442 Power Electronics

Harmonic Profile ECE 442 Power Electronics