Three-Phase Inverters - PowerPoint PPT Presentation

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Title:

Three-Phase Inverters

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Three-Phase Inverters Consider three single-phase inverters in parallel, driven 120 apart. Three-Phase Inverter (continued) Alternative (Preferred) Configuration ... – PowerPoint PPT presentation

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Title: Three-Phase Inverters


1
Three-Phase Inverters
Consider three single-phase inverters in
parallel, driven 120 apart.
2
Three-Phase Inverter (continued)
Three single-phase full bridge inverters
12 transistors, 12 diodes, 3 transformers Could
it be simpler?
3
Alternative (Preferred) Configuration
6 transistors, 6 diodes
conduction for 120 or 180
4
180 Conduction
  • Three transistors ON at a time

5
Summary Table
6
Waveforms for 180? Conduction
7
Phase Voltages for 180? Conduction
8
Waveforms for 180? Conduction
9
Summary Table
10
Mode 1 Operation
11
Mode 1 Operation
Q1, Q5, Q6 conduct
12
Summary Table
13
Mode 2 Operation
14
Mode 2 Operation
Q1, Q2, Q6 conduct
15
Summary Table
16
Mode 3 Operation
17
Mode 3 Operation
Q1, Q2, Q3 conduct
18
Phase Voltages for 180? Conduction
19
Fourier Series for Line-to-Line Voltages
20
For the other Line-to-Line Voltages
21
Line-to-Line rms Voltage
22
rms value of the nth Component
Fundamental Component
23
Line-to-Neutral Voltages
24
Phase Voltages (Y-connected load)
25
Line Current for an RL load
26
DC Supply Current
ILv3Io is the rms load line current Vo1
fundamental rms output line voltage Io is the rms
load phase current T1 the load impedance angle
at the fundamental frequency
27
Three-Phase Inverter with RL Load
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