研究目的
To compare the performance of two high power three-phase inverters (one built from SiC MOSFETs and the other from Si IGBTs) in terms of efficiency and conducted EMI for more electric aircraft applications.
研究成果
SiC inverters demonstrate higher efficiency compared to Si inverters, even at increased switching frequencies, due to lower conduction and switching losses. However, SiC inverters generate higher levels of conducted EMI, requiring additional filtering to meet aviation standards. The theoretical analysis aligns well with experimental results for SiC but not fully for Si. Future work should focus on integrating filters for SiC inverters and further validating reliability.
研究不足
The Si inverter has integrated EMI filters, which the SiC inverter lacks, potentially skewing efficiency and EMI comparisons. Theoretical models for Si devices show discrepancies with experimental results. Scaling factors for switching losses are ignored for simplicity. The study is limited to conducted EMI and does not address radiated EMI or reliability aspects like short-circuit capabilities.
1：Experimental Design and Method Selection:
The study compares two commercially available integrated power modules (IPMs) – one Si IGBT-based and one SiC MOSFET-based inverter. Theoretical analysis of power losses is conducted using linear approximations and datasheet parameters, supported by simulations and experimental measurements. EMI measurements follow MIL-STD-461G standards.
2：Sample Selection and Data Sources:
Two IPMs are used: a Si inverter rated at 225 kW with 1200 V/450 A IGBTs and a SiC inverter rated at 250 kW with 1200 V/325 A SiC MOSFETs. Data is sourced from manufacturer datasheets and experimental setups.
3：List of Experimental Equipment and Materials:
Includes DC power supply, Line Impedance Stabilization Networks (LISNs), RF enclosure, shielded room, R-L load, digital signal processor (DSP), custom interface board, and the inverters themselves (Si and SiC IPMs).
4：Experimental Procedures and Operational Workflow:
The inverters are tested on a copper ground plane. DC supply is passed through LISNs for EMI measurement. Efficiency is measured at 540 V DC bus, 10 kHz switching frequency, sine-pulse width modulation (SPWM) with modulation index of one, and output power up to 30 kW. EMI is measured across the LISN in an RF enclosure.
5：Data Analysis Methods:
Power loss analysis uses MATLAB's Curve Fitting Toolbox for linear relationships. Efficiency is calculated from input and output power measurements. EMI spectra are compared against MIL-STD-461G limits.
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