Ministry of Education and Training
University of Technology and Education HCMC POWER ELECTRONICS www.hcmute.edu.vn I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.1. Definition:
DC/AC inverters are used for converting a DC power
source into an AC power application. Input Output DC – AC - DC - AC CONVERTER - Uin - f, U0; Controller 2 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.1. Definition: Output DC – AC - AC CONVERTER - f, U0; Controller 3 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.1. Definition:
VFD - VARIABLE FREQUENCY DRIVE OR ASD – ADJUSTABLE SPEED DRIVE ▪
Adjustable-speed induction motor drive systems are
widely used in industrial applications; ▪
These systems require DC/AC power supply with variable frequency; ▪
0 to 400Hz in fractional HP to hundreds of HP. 4 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.2. Classification INVERTER
• VSI – Voltage Source Inverter.
• CSI - Current Source Inverter.
• ZSI - Impedance Source Inverter.
1. Single-phase half-bridge VSI
2. Single-phase ful -bridge VSI
3. Three-phase full-bridge VSI
4. Three-phase full-bridge CSI 5. Multistage PWM inverters 6. Soft-switching inverters
7. Impedance-source Inverters (ZSI) 5 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.2. Classification - Cyclo converter: AC – AC VFD f <= f 2 1 - Inverter: AC – DC - AC f (Wide range) 2 6 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.3. Structure: Single-phase Half-Bridge VSI S: Power semiconductor Switch: BJT, MOSFET, IGBT, GTO, IGCT ➔ ON/0FF by Pulse 7 FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ 8 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.3. Structure:
Single-phase H- Bridge or Full Bridge VSI 9 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.3. Structure:
Three-phase H- Bridge or Full Bridge VSI 10 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.3. Structure:
Three-phase H- Bridge or Full Bridge VSI With Braking Resistor 11 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.4. Applications •
Variable voltage/variable frequency AC supplies
in an ASD, such as induction motor drives,
synchronous machine drives, and so on. • UPSs. •
Static var (reactive power) compensations. •
Passive/active series/parallel filters. •
FlexibleAC transmission systems (FACTSs). • Voltage compensations. I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.4. Applications VFD 13 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.4. Applications VFD 14 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.4. Applications Wind energy Solar energy AC – DC -AC DC -AC 15 I. INTRODUCTION FEEE Ensuring Enhanced Education www.hcmute.edu.vn/feee/ I.4. Applications UPFC UPS 16 FEEE
II. Single-phase Half-Bridge VSI Ensuring Enhanced Education www.hcmute.edu.vn/feee/ U = U/2 0RMS 17 FEEE
II. Single-phase Half-Bridge VSI Ensuring Enhanced Education www.hcmute.edu.vn/feee/ SPWM 18 FEEE
III. Single-phase Ful -Bridge VSI Ensuring Enhanced Education www.hcmute.edu.vn/feee/ U = U 0RMS 19 FEEE
III. Single-phase Ful -Bridge VSI Ensuring Enhanced Education www.hcmute.edu.vn/feee/ SPWM 20