Power-Dense Shipboard-Compatible Low-Horsepower Variable-Frequency Drives

Current source rectifiers in discontinuous conduction modes of operation

“…The proposed PWM method has been incorporated into a complete hardware system that can operate with or without a closed loop dc voltage regulator. Experimental results on a first article prototype [8] at scaled down voltage and current levels have demonstrated the effectiveness of this new PWM technique. In addition, a highly predictable and controllable model for the CSR that extends down to no load has been developed and verified to be accurate, bringing the application of PWM-controlled CSRs one step closer to commercialization.…”

“…The circuit of Fig. 1 was implemented in hardware using the 3kW system described in [8] and operating with the parameters listed in Table II: The hardware and controls were also simulated using a PLECS model embedded within the MATLAB-SIMULINK environment and performance was validated over wide range of operating conditions and operating parameters. The controls of Fig.…”

“…1, as opposed to the more common VSR or boost rectifier for both Variable Frequency Drive (VFD) and distributed DC bus applications [1]- [8]. Interest in this topology is due to the facts that system compatible interface to an AC service or mains can be accomplished with less and smaller external components [2], [7], [8] and that the topology is compatible with emerging power semiconductor devices such as the Silicon Carbide (SiC) MOSFET [5], [6].…”

“…1, as opposed to the more common VSR or boost rectifier for both Variable Frequency Drive (VFD) and distributed DC bus applications [1]- [8]. Interest in this topology is due to the facts that system compatible interface to an AC service or mains can be accomplished with less and smaller external components [2], [7], [8] and that the topology is compatible with emerging power semiconductor devices such as the Silicon Carbide (SiC) MOSFET [5], [6]. Trends in literature demonstrate that the CSR is a more power dense alternative to the VSR for applications requiring low input current individual harmonic distortion (IHD) and low conducted electromagnetic interference (EMI) in power ranges of <20kW [7], [8].…”

“…Interest in this topology is due to the facts that system compatible interface to an AC service or mains can be accomplished with less and smaller external components [2], [7], [8] and that the topology is compatible with emerging power semiconductor devices such as the Silicon Carbide (SiC) MOSFET [5], [6]. Trends in literature demonstrate that the CSR is a more power dense alternative to the VSR for applications requiring low input current individual harmonic distortion (IHD) and low conducted electromagnetic interference (EMI) in power ranges of <20kW [7], [8]. Improved power density over the VSR is because the CSR does not impose differential mode voltage pulses on the input and common mode voltage is lower thus requiring less EMI mitigating hardware [7].…”