Research Work Of Power Electronics Lab

Field Tests of Active Power Filter (APF)



An active power filter (APF) was built by cooperation between power electronics lab of UM and Tsinghua University. The APF was installed in the feeder for the main square of the Gymnasium of University of Macau during Nov. 20th to Dec. 20th, 2007 for testing. The total harmonic distortion of the source currents reduce from 20% to around 9%. The reactive power and neutral currents are also compensated simultaneously by the AFP.

CPLD-implemented Soft-Switching for Two-Level Inverter --- Hardware prototypes and testing results

CPLD
CPLD-implement soft-switching for two-level inverter

Two-Level Active Power Filter (APF) --- Established by University of Macau & parallel part of the UPQC

CPLD-implement soft-switching
for two-level inverter
Two-level active power filter (APF)
Two-level voltage source
inverter for the filter
Compensation of the current harmonics and neutral current 
After compensation
Before compensation
Compensation of the reactive power and harmonics
Before compensation









After compensation


Dynamic Voltage Restorer (DVR) --- Jointly established by Tsinghua University and University of Macau & series part of the UPQC
Dynamic voltage restorer (DVR)
DVR response time
 
Compensation of voltage fluctuation
Compensation of voltage sag
Before compensation
 
After compensation

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