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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
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CPLD-implement soft-switching for two-level inverter |
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Two-Level Active Power Filter (APF) --- Established by University of Macau & parallel part of the UPQC
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CPLD-implement soft-switching |
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| Two-level active power filter (APF) | Two-level voltage source |
Compensation of the current harmonics and neutral current
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| Before compensation | After compensation |
Compensation of the reactive power and harmonics
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| Before compensation | After compensation |
Dynamic Voltage Restorer (DVR) --- Jointly established by Tsinghua University and University of Macau & series part of the UPQC
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| Dynamic voltage restorer (DVR) | DVR response time |
| Compensation of voltage fluctuation
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Compensation of voltage sag | |
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Before compensation |  |
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Two-Level Hybrid Active Power Filter (HAPF) --- Established by University of Macau
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| Front view | Back view |
Three-phase load voltage, source current and load current
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| Before compensation | After compensation |
Three-phase voltages, currents and power factors
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| Before compensation | After compensation |
Three-Level Active Power Filter (APF) --- Jointly established by Tsinghua University and University of Macau
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DSP for reference calculations |
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| Three-level active power filter (APF) | FPGA-based generalized pulse width modulator |
Compensation of the reactive power and harmonics
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| Before compensation | After compensation |