DC/AC 3-Phase Inverter (LTspice Model)
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Transcript of DC/AC 3-Phase Inverter (LTspice Model)
DC/AC Inverter (3-Phase) Simplified SPICE Behavioral Model
All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 1
Contents
1. Model Overview
2. Benefit of the Model
3. Concept of the Model
4. 3-Phase DC/AC Specification (Example)
5. Parameter Settings
6. Input-Output Characteristics6.1 Simulation Circuit and Setting
7. Line-to-Line Output Characteristics7.1 Simulation Circuit and Setting
8. Efficiency Characteristics8.1 Simulation Circuit and Setting
9. Minimum DC Input Voltage9.1 Simulation Circuit and Setting
Library Files and Symbol Files Location
Simulation Index
All Rights Reserved Copyright (C) Bee Technologies Corporation 2011 2
1.Model Overview
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• This 3-Phase DC/AC Inverter Simplified SPICE Behavioral Model is for users who require the model of an Inverter as a part of their system.
• The model focuses on the input/output relationships of the Inverter block; therefore, it is not using high frequency models (e.g. oscillator and noise models), and is not based on the electronic topologies of the Inverter.
• The model enables long-term behavior simulation of the system (e.g. in a Photovoltaic system simulation).
2.Benefit of the Model
• Enable Transient Simulation.
• Can be adjusted to your own 3-Phase DC/AC specifications, by editing the
model parameters.
• The simplified model is an easy-to-use, which can be provided without the
circuit detail.
• Time and costs are saved because only the necessary parts are simulated.
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3.Concept of the Model
The model is characterized by parameters n, Vin_min, Vin_max, Vo_ac and Freq that represent the input-output-relationships of the Inverter. Where,
PAC : AC output powerPDC : DC input power
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3-Phase DC/AC Inverter Simplified SPICE Behavioral Model
IN+
IN-
U
N
VIN,MIN~VIN,MAX (Vdc)
IIN IO~
~
V
W
DC
AC
P
PnEfficiency )(
ININ IV
IV OO
)(3POUT(3-phase)
4.DC/AC Specification (Example)
3-Phase DC/AC Inverter with •VIN = 24~250Vdc, •VO, LN = 100VAC, •POUT(3-phase) = 1500W,•and Efficiency = 80%
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3-Phase DC/AC InverterEfficiency (n) = 80%
Operating Input Voltage:VIN,MIN=24 ~ VIN,MAX =250(Vdc)
IN+
IN-
~ POUT(3-phase)
IO~IIN
U
N
V
W
5.Parameter Settings (Example)
VIN_MIN DC minimum input voltage• 0 < VIN_MIN < VIN_MAX• Value = 24V
VIN_MAX DC maximum input voltage• VIN_MAX > VIN_MIN• Value = 250V
VO_AC AC Output Voltage, rms value• e.g. 100V, 220V• Value = 100V
FREQ AC Output Frequency• e.g. 50Hz, 60Hz• Value = 50Hz
N Efficiency in 100%• 0 < N < 1• Value = 0.8 (80% Efficiency)
• From the inverter specification, the model is characterized by setting parameters VIN_MIN, VIN_MAX, VO_AC, FREQ, and N.
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6.Input-Output Characteristics
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3-Phase AC Output Voltage: VO, LN
DC Input Current
DC Input Voltage
3-Phase AC Output Current
6.1 Simulation Circuit and Setting
*Analysis directives: .TRAN 0 100ms 0 10us
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7.Line-to-Line Output Characteristics
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Line-to-Line Output Current
Line-to-Line Output Voltage
DC Input Voltage
DC Input Current
7.1 Simulation Circuit and Setting
*Analysis directives: .TRAN 0 100ms 0 10us
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8.Efficiency Characteristics
Output and efficiency of the Inverter on time domain analysis.Efficiency(n) = PAC/PDC Efficiency = (3*VO(RMS)*IO(RMS)/VIN*IIN)*100, where the output voltage (VO(RMS)) is the inverter spec and the output current (IO(RMS)) is read from the simulation result.
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N = 0.8 Hold the Ctrl key and left click to Calculate RMS value of I(Ru)
8.1 Simulation Circuit and Setting
*Analysis directives: .TRAN 0 50s 0 10ms
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9.Minimum DC Input Voltage
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VO(AC) disable as VIN < VIN ,MIN
3-Phase AC Output Voltage
DC Input Voltage
DC Input Current
24.00ms, 24.00V
9.1 Simulation Circuit and Setting
*Analysis directives: .TRAN 0 250ms 0 10u
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Library Files and Symbol Files Location
1) Copy LIB files from CD to C:\Program Files\LTC\LTspiceIV\lib\sub
2) Copy LTspice symbols files from CD to C:\Program Files\LTC\LTspiceIV\lib\sym
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.LIB
.ASY
Simulation Index
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Simulations Folder name
1. Input-Output Characteristics.............................................
2. Line-to-Line Output Characteristics..................................
3. Efficiency Characteristics.................................................
4. Minimum DC Input
Voltage...............................................
VO_LN
VO_LL
Efficiency
VIN_MIN