Title :
Research on three-phase inverter with unbalanced load
Author :
Li, Peng ; Dan, Bai ; Yong, Kang ; Jian, Chen
Author_Institution :
Dept. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
One of important performances of three-phase inverter is output voltage symmetry. Unsymmetrical output voltage is caused mainly by unbalanced load. The mechanism distorting output voltage fundamental waveform of an inverter under unbalanced load is analyzed based on symmetrical component decomposing and superimpose theory. It is present that positive-, negative- and zero-sequence components of output voltage show different effect of compensating. This problem is related to not only controller characteristic but also the inherent nature of the inverter circuit The method to improve the output voltage symmetry of inverter is proposed in this paper. Theoretical analysis is confirmed well through both simulation and experimental results on a 35 kW DSP-controlled three-phase inverter.
Keywords :
PWM invertors; digital control; digital signal processing chips; voltage control; 35 kW; DSP-control; controller characteristic; negative-sequence component; positive-sequence component; superimpose theory; symmetrical component; three-phase inverter; unbalanced load; unsymmetrical output voltage; voltage distortion; voltage symmetry; zero-sequence component; Analytical models; Circuit simulation; Educational institutions; Filters; Impedance; Leg; Power supplies; Power transformer insulation; Pulse width modulation inverters; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2004. APEC '04. Nineteenth Annual IEEE
Print_ISBN :
0-7803-8269-2
DOI :
10.1109/APEC.2004.1295799
