Doctoral Dissertation A Three-Phase SCVD Based Boost Inverter with Low Common Mode Voltage for Transformerless Photovoltaic Grid-Connected System Department of Electrical Engineering Graduate School, Chonnam National University BY Tran Tan Tai

(Abstract)

 This study deals with a new type of inverter called a three-phase SCVD based boost inverter. The introduced structure is a combination of an SCVD network and the three-phase bridge to restrict the common-mode voltage. Therefore, the introduced inverter can produce a high output voltage from the low input voltage. The DC-bus voltage of the introduced solution stands at twice of the input voltage. Moreover, the variation in common-mode voltage can o be restricted within one-sixth of DC-bus voltage. Modeling, circuit analysis, operating principles, and a comparison between the introduced SCVD based boost inverter with the other VSIs are performed. To confirm the performance improvements of the introduced SCVD based boost inverter, a preliminary prototype of the introduced SCVD based boost inverter is built in the laboratory and the simulation studies based on PLECS environment and experimental studies are performed. Besides that, a modified SCVD based boost inverter is also introduced to step up the DC-bus voltage to triple of input voltage instead of twice of input voltage like that in the proposed SCVD based boost inverter. Furthermore, a common-mode voltage of the modified SCVD based boost inverter is x canceled through switching the four extra active-switches based on the Boolean logic function. As a result, common-mode voltage is maintained as constant at the value of 0 V during all time. Moreover, the voltage stress across additional semiconductor devices is standing at one-third of DC-bus voltage. The simulation studies based on PLECS environment prove the effectiveness of the modified SCVD based boost inverter. Finally, to validate the performance, operating principle, and feasibility of the modified SCVD based boost inverter, the experimental studies based on the laboratory prototype with a DSP F280049C are carried out. Doctoral Dissertation A Three-Phase SCVD Based Boost Inverter with Low Common Mode Voltage for Transformerless Photovoltaic Grid-Connected System Department of Electrical Engineering Graduate School, Chonnam National University BY Tran Tan Tai (Abstract) This study deals with a new type of inverter called a three-phase SCVD based boost inverter. The introduced structure is a combination of an SCVD network and the three-phase bridge to restrict the common-mode voltage. Therefore, the introduced inverter can produce a high output voltage from the low input voltage. The DC-bus voltage of the introduced solution stands at twice of the input voltage. Moreover, the variation in common-mode voltage can o be restricted within one-sixth of DC-bus voltage. Modeling, circuit analysis, operating principles, and a comparison between the introduced SCVD based boost inverter with the other VSIs are performed. To confirm the performance improvements of the introduced SCVD based boost inverter, a preliminary prototype of the introduced SCVD based boost inverter is built in the laboratory and the simulation studies based on PLECS environment and experimental studies are performed. Besides that, a modified SCVD based boost inverter is also introduced to step up the DC-bus voltage to triple of input voltage instead of twice of input voltage like that in the proposed SCVD based boost inverter. Furthermore, a common-mode voltage of the modified SCVD based boost inverter is canceled through switching the four extra active-switches based on the Boolean logic function. As a result, common-mode voltage is maintained as constant at the value of 0 V during all time. Moreover, the voltage stress across additional semiconductor devices is standing at one-third of DC-bus voltage. The simulation studies based on PLECS environment prove the effectiveness of the modified SCVD based boost inverter. Finally, to validate the performance, operating principle, and feasibility of the modified SCVD based boost inverter, the experimental studies based on the laboratory prototype with a DSP F280049C are carried out.

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