Title :
A novel single-phase voltage sag restorer with diode-clamped multilevel bridge
Author :
Ding, K. ; Cheng, K.W.E. ; Xue, X.D. ; Divakar, B.P. ; Wang, S.X. ; Xu, C.D. ; Wang, D.H.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech. Univ., Hong Kong, China
Abstract :
A novel single-phase voltage sag restorer with diode-clamped multilevel bridge is presented. In the proposed circuit, traditional two-level half bridge inverter is replaced by multilevel diode-clamped inverter, in which the DC-bus voltage is split into several levels by series-connected bulk capacitors. Although the multilevel circuit has more component count than the two-level circuit it is more suitable for high voltage applications. The restorer is bypassed under normal operating conditions and is connected to the load depending upon voltage sag detection. The switches of the inverter are controlled by PWM signals. In the paper the operation of the multilevel circuit is simulated in SABER to study the operating capability of the multilevel inverter. A comparative study between the traditional two-level circuit and the proposed multilevel circuit is provided to highlight the performance of the multilevel circuit.
Keywords :
PWM invertors; bridge circuits; power supply quality; power system restoration; DC-bus voltage; PWM inverter control; diode-clamped multilevel bridge circuit; high voltage applications; multilevel diode-clamped inverter; power systems; series-connected bulk capacitors; single-phase voltage sag restorer; Bridge circuits; Circuit simulation; Diodes; Power electronics; Power quality; Power system reliability; Power system restoration; Pulse width modulation inverters; Switches; Voltage fluctuations; Diode-Clamped; Multilevel; Power interruption; Power system; Voltage sag;
Conference_Titel :
Power Electronics Systems and Applications, 2009. PESA 2009. 3rd International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-3845-7
