Three-phase CVCF sinewave ZVS-PDM cycloinverter using single-phase high-frequency inverter with synchronized ZVS-PWM resonant DC link

This paper presents a newly-proposed high-performance 3fCVCF power conversion conditioner incorporating a new quasi-resonant DC link (QRDCL) ZVS-PWM single-phase inverter and high-frequency transformer coupled cycloconverter cascade topology. The operating characteristics of a proposed QRDCL are described and evaluated on the basis of the computer-aided simulation analysis. In order to achieve significant improvements in high performance and quick control response, the specially-designed voltage pulse distributed vector control modulation (modified PDM) scheme is actually introduced through employing DSP-based control implementation. This instantaneous voltage vector controlled three-phase CCVF power conditioning system suitable for a low EMI, high-power density UPS is realized for linear and nonlinear electrical loads and its effectiveness under the operating conditions of large load variations from an experimental point of view. Furthermore, the synchronized ZVS-PWM resonant DC link high-frequency inverter using power MOSFET modules is precisely simulated by introducing the dynamic and steady-state modelling of power MOSFETs and its excellent operation is verified as compared with this QRDCL inverter circuit using ideal power switches.<>