In this paper, experimental study of Sliding Mode Controller (SMC) DC bus voltage of three phase shunt active power filter (APF), to improve power quality by compensating harmonics and reactive power required by nonlinear load is proposed. The algorithm used to identify the reference currents is based on the Self Tuning Filter (STF). For generation of the pulse switching of the IGBTs inverter the hysteresis current controller is used, implemented into an analogue card. Finally, various experimental results are presented under steady state and transient conditions.
- Shunt Active Power Filter (APF)
- Total Harmonic Distortion (THD)
- Sliding Mode Controller (SMC)
- Self Tuning Filter (STF)
Fig. 1: The basic compensation principle of the shunt APF.
EXPECTED SIMULATION RESULTS:
Fig. 2. Experimental APF results: load current iL (A), filter current iF (A)
and source current iS (A). Ch1 to Ch4 scale: 5 A/div. Time scale: 20 ms/div.
Fig. 3. Experimental APF results: load current iL (A), filter current iF (A),
source current iS (A) and source voltage Vs (V). Ch1 and Ch3 scale: 5 A/div;
Ch2 scale: 100 V/div;Ch4 scale: 80 V/div; Time scale: 10 ms/div.
Figure 4. Experimental APF results : load current iL(A), filter current iF(A) ,
source current iS(A) and DC voltage Vdc(V). Ch1,Ch3 and Ch4 scale: 10
A/div. Ch2 scale: 100 V/div. Time scale: 20 ms/div.
Figure 5. Experimental APF results: DC voltage Vdc (V) and DC reference
voltage V*dc (V). Ch1 and Ch2 scale: 100 V/div. Time scale: 1s/div
The control of the shunt Active Power Filter was divided in three parts, the first one realized by the dSPACE system to generate the reference currents, the second one achieved by an analogue card for the switching pattern generation, implementing a hysteresis current controller and the third party use a sliding mode controller SMC. A SMC controlled shunt active power filter has been studied to improve the power quality by compensating both harmonics and reactive power requirement of the nonlinear load. The performance of the SMC controller has been developed in real time process and successfully tested in the laboratory The results of experiment study of APF control technique presented in this paper are found quite satisfactory to eliminate harmonics and reactive power components from utility current. The shunt APF presented in this paper for the compensation of harmonic current components in non-linear load was effective for harmonic isolation and keeping the utility supply line current sinusoidal. The validity of this technique was proved on the basis of experiment results. The APF is found effective to meet IEEE- 519-1992 standard recommendations on harmonics levels.
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