SRF Method This study presents the capacity of a self-tuning filter based on the synchronous reference frame method with a fuzzy logic controller for the improvement of the efficiency of harmonic suppression of a shunt hybrid active power filter in an unbalanced distorted and undistorted voltage supply conditions.
The simulation results indicated that the filter with a fuzzy logic controller had a good filtering performance in steady and transient states, irrespective of whether the voltage supply is distorted or unbalanced.
Figure 1. SRF control strategy with STF based on SHAPF.
EXPECTED SIMULATION RESULTS:
Figure 2. SHAF response under ideal voltage situation (a) Source voltage (Vs), (b) Load current (IL), (c) load current with filter, (d) Filter compensation current ( If) , and (e) DC link voltage of system (Vdc).
Figure 3. THD of current (Is)under ideal voltage supply.
Figure 4. SHAF response under non ideal voltage situation (a) Source voltage (Vs), (b) Load current (Il), (c) load current with filter, (d)Filter compensation current ( If), and (e) DC link voltage of system (Vdc).
This paper investigated the effectiveness of a synchronous reference frame (SRF) with a self-tuning filter (STF) control strategy in controlling the performance of a three-phase SHAPF system under conditions of non-ideal and balanced supply voltage. The fuzzy logic controller was utilized for the adjustment of the DC voltage.
The performance of the SHAPF system was investigated under a dynamic and steady state and under different load operating conditions. The simulation results showed the SAPF to have successfully reduced current harmonics to about 1.7 and 2.7 % for both cases of source voltages.
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