Inverter Analysis

	Andrew Chernichenko
		Electrical and Computer Engineering
		Portland State University

Slide 2

Introduction

	Voltage Source Inverters (VSI):
	1. Pulse width modulated
	2. Square wave
	3. Single phase with voltage   cancellation

PWM

	Input voltage is essentially constant
	Inverter must control the magnitude and the frequency of the AC output

Inverter

PWM Output

Square Wave

	Input DC voltage is controlled for the desired magnitude of the AC voltage
	Controls only the frequency of the output voltage

Square Wave Output

AC Control By Voltage Cancellation

	Magnitude and frequency can be controlled
	Combine the characteristics of the previous two inverters
	Can only be used in single-phase

Voltage Cancellation Output

AC Voltage Output

Conclusion

	PWM: most expensive and required for “legal” Grid-Tie connection.Ideal for all electronic equipment. Achieved efficiency as much as 94%.