Real-time analysis of fuzzy controlled 2C dual buck half-bridge shunt APF with different MFs for dynamic unbalanced load

In this paper the real time dynamic performance analysis of 3-phase 4-wire split capacitor (2C) dual-buck half bridge inverter based shunt active power filter (2C DBHB APF) for unbalanced load has been presented using id-iq control strategy. The dual-buck half-bridge inverter is an effective solution of eliminating the most perilous shoot-through mode being occurred in conventional inverter circuit having two switches arrayed in series in each leg. Here fuzzy logic controller (FLC) has been used as the dc side controller with different membership functions (MFs) such as triangular, trapezoidal and Gaussian for the generation of reference compensating current, as it possess the best performance under non-linear dynamic load. The FLC proposed offers faster response than the conventional controller during load transition. The real-time implementation of the 2C DBHB APF is being done by using OP5142-Spartan 3 FPGA based real-time digital simulator. Further the circuit has good capability to confiscate shoot-through mode, which endows the filtering system higher reliability. The obtained simulation and real-time results validate the effectiveness of the proposed FLC based 2C DB HB SAPF by reducing the total harmonic distortion of current less than 5 % and also manage the current unbalance factor for unbalanced load condition.