Title :
A new space vector modulation scheme for three phase four wire inverter for standalone photovoltaic systems
Author :
Fouzey, S. ; El-Barbari, S. ; Hofmann, W. ; Unsalver, C.
Author_Institution :
Dept. of Electr. Machines & Drives, Chemnitz Univ. of Technol.
Abstract :
Three phase inverters with unbalanced load have a lot of disadvantages like small utilisation of the DC-link voltage, dependency of the modulation factor of the load current, and the superposition of a DC component with the output AC voltage. The four-phase inverter is able to supply both symmetrical and asymmetrical consumers in the three-phase standalone photovoltaic nets. By the additional half bridge possible to reduce the DC-link voltage by 16% and dc-link capacity by 35%. In this paper a three dimensional space vector modulation for a four leg inverter for standalone photovoltaic systems is presented to solve these problems. A digital control based on a load current observer is implemented according to S. El-Barbari and W. Hofmann (2001), to control the whole system with a microcontroller. Simulation results are presented to verify the performance of the proposed system
Keywords :
digital control; invertors; microcontrollers; observers; photovoltaic power systems; power generation control; DC-link voltage; dc-link capacity; digital control; four-phase inverter; load current observer; microcontroller; modulation factor; space vector modulation scheme; standalone photovoltaic systems; three phase four wire inverter; unbalanced load; Bridge circuits; Control systems; Digital control; Inverters; Leg; Phase modulation; Photovoltaic systems; Solar power generation; Voltage; Wire; Pulse Width Modulation (PWM); Solar Cell System; Voltage Source Inverters (VSI;
Conference_Titel :
Power Electronics and Applications, 2005 European Conference on
Conference_Location :
Dresden
Print_ISBN :
90-75815-09-3
DOI :
10.1109/EPE.2005.219592