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

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)

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 FOR MORE INFO... http://energy.ece.uiuc.edu/energychallenge/

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

PSpice Inverter Circuit

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

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

Voltage Waveforms

Output Voltage, FFT

Low-pass Filter Region

Phase Currents

Voltage and Current for PhaseAB

Phase Va Voltage and Current

Input Power

Conclusions/Comments Simulated output voltage: Va was 119.2 rms Vb was 119.6 rms Vab was 238.7 rms Investigate other inverter topologies Use a higher modulating frequency of 19.980 kHz