1. Tim Cunnyngham 2001 Future Energy Challenge Project
Inverter Simulation
Tim Cunnyngham
2001 Future Energy Challenge Project

2. Inverter Requirements
Operate from a 400 V DC input
Maximum continuous power = 10kW
Output: Split single-phase 120/240 V, 60 Hz ± 0.1 Hz (standard outlets)

3. Additional Requirements
THD < 5% for standard nonlinear load test
Acoustic noise < 50dB at 1.5 meters
Conform to FCC Class A for conducted and radiated EMI
Self-protection, and overload monitoring
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4. Simulation Assumptions
Input voltage is constant at 400V DC
All circuitry and components can be realized
Components are not ideal and include on-state resistance
Switching transients ignored

5. PSpice Inverter Circuit

6. Simulated Inverter Fundamental frequency f1: 60 Hz
Modulation frequency fs: 5940 Hz
Amplitude modulation ratio ma: 0.85
Loads are inductive-resistive
Output is 120/240 Vrms nominal

7. Simulation Results The following slides illustrate
Output voltage waveforms
Output voltage frequency analysis, FFT
The phase currents in the 3 loads
Phase Fundamental Voltage and Current
Instantaneous input power

8. Voltage Waveforms

9. Output Voltage, FFT

10. Low-pass Filter Region

11. Phase Currents

12. Voltage and Current for PhaseAB

13. Phase Va Voltage and Current

14. Input Power

15. Conclusions/Comments
Simulated output voltage:
Va was rms
Vb was rms
Vab was rms
Investigate other inverter topologies
Use a higher modulating frequency of kHz