Operation of shunt active power filter under unbalanced and distorted load conditions

In this study, reduced current measurement control method is investigated for operation of 3-phase 4-wire shunt active power filter (SAPF) under unbalanced and distroted load conditions. The control method is based on Instantaneous Reactive Power theory (IRP) and requires only measuring the source currents to reduce the number of Current Sensors (CSs) needed in the conventional control approach. The control technique has been tested under different load conditions using Matlab/Simulink simulations and validated with a 10 kVA/380 V experimental prototype based on TMS320F28335 Digital Signal Processor (DSP). Both simulation and experimental test results demonstrate that the viability of the reduced current measurement method, successful in meeting the IEEE 519-1992 recommended harmonic standard limits.