Matrix Converter(MC),a direct AC-ACconverter which is capable of bidirectional powerflow,unity input power factor control and efficiencyimprovement.Thus,it is more suitable for integrationof motor machine and power el...Matrix Converter(MC),a direct AC-ACconverter which is capable of bidirectional powerflow,unity input power factor control and efficiencyimprovement.Thus,it is more suitable for integrationof motor machine and power electronics systems.This paper investigated a novel generationsystem,which is composed of hybrid excitedsynchronous generator(HESG)and matrix converter(MC),as shown in Fig.1.Owing to the voltage clampcircuit,this structure waived an external DC sourcecommonly used for the excitation for HESG.Thevoltage clamp circuit shared a DC bus with afull-bridge converter and the excitation winding ofHESG is directly connected to the output of thefull-bridge converter achieving a bidirectional currentflow.展开更多
A comprehensive predictive strategy was proposed for the neutral-point balancing control of back-to-back three-level converters. The phase currents at both sides and the DC-link capacitor voltages were measured for th...A comprehensive predictive strategy was proposed for the neutral-point balancing control of back-to-back three-level converters. The phase currents at both sides and the DC-link capacitor voltages were measured for the prediction of the neutral-point current. A quality function was found to balance the neutral-point, and a metabolic on-times distribution factor was used as a predicator to minimize the quality function at each switching state. Simulation results show that the proposed method produces smaller ripples in tested signals compared with the established one, namely, 9.15% less in a total harmonic distortion(THD) of line-to-line voltage, 1.08% less in the THD of phase current, and 0.9 V less in the ripple of the neutral-point voltage. The obtained experimental results show that the main harmonics of the line-to-line voltage and the phase current in the proposed method are improved by 10 d B and 6 d B, respectively, and the ripple of neutral-point voltage is halved compared to the established one.展开更多
文摘Matrix Converter(MC),a direct AC-ACconverter which is capable of bidirectional powerflow,unity input power factor control and efficiencyimprovement.Thus,it is more suitable for integrationof motor machine and power electronics systems.This paper investigated a novel generationsystem,which is composed of hybrid excitedsynchronous generator(HESG)and matrix converter(MC),as shown in Fig.1.Owing to the voltage clampcircuit,this structure waived an external DC sourcecommonly used for the excitation for HESG.Thevoltage clamp circuit shared a DC bus with afull-bridge converter and the excitation winding ofHESG is directly connected to the output of thefull-bridge converter achieving a bidirectional currentflow.
基金Project(61074018)supported by the National Natural Science Foundation of ChinaProject(2012kfjj06)supported by Hunan Province Key Laboratory of Smart Grids Operation and Control(Changsha University of Science and Technology),China
文摘A comprehensive predictive strategy was proposed for the neutral-point balancing control of back-to-back three-level converters. The phase currents at both sides and the DC-link capacitor voltages were measured for the prediction of the neutral-point current. A quality function was found to balance the neutral-point, and a metabolic on-times distribution factor was used as a predicator to minimize the quality function at each switching state. Simulation results show that the proposed method produces smaller ripples in tested signals compared with the established one, namely, 9.15% less in a total harmonic distortion(THD) of line-to-line voltage, 1.08% less in the THD of phase current, and 0.9 V less in the ripple of the neutral-point voltage. The obtained experimental results show that the main harmonics of the line-to-line voltage and the phase current in the proposed method are improved by 10 d B and 6 d B, respectively, and the ripple of neutral-point voltage is halved compared to the established one.
