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Frontiers in Energy

ISSN 2095-1701

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Front. Energy    2015, Vol. 9 Issue (4) : 446-460    https://doi.org/10.1007/s11708-015-0378-2
RESEARCH ARTICLE
Performance investigation of artificial intelligence based controller for three phase four leg shunt active filter
J. JAYACHANDRAN(), R. MURALI SACHITHANANDAM
Department of Electrical and Electronics Engineering, SASTRA University, Thanjavur 613401, India
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Abstract

In this paper, the choice of power quality compensator is a DSTATCOM which constitutes a three phase four leg voltage source converter (VSC) with a DC capacitor. The control strategy proposed for the DSTATCOM is a neural network based one cycle control (OCC). This control strategy involves neural network block, digital circuits and linear elements, which eliminates the sensors required for sensing the load current and coupling inductor current in addition to the multiplier employed in the conventional method. The calculation of harmonic and reactive currents for the reference current generation is also eliminated, thus minimizing the complexity in the control strategy. The control strategy mitigates harmonic/reactive currents, ensures balanced and sinusoidal source current from the supply mains that are nearly in phase with the supply voltage, compensates neutral current, and maintains voltage across the capacitor under unbalanced source and load conditions. The performance of the DSTATCOM with the proposed artificial neural network (ANN) controllers is validated and investigated through simulations using Matlab software. The simulation results prove the efficacy of the proposed neural network based control strategy under varying source and load conditions.
Keywords neural network      DSTATCOM      neutral current mitigation      total harmonic distortion (THD)      three phase four wire distribution system      unbalanced and/or distorted source     
Corresponding Author(s): J. JAYACHANDRAN   
Just Accepted Date: 28 July 2015   Online First Date: 24 September 2015    Issue Date: 04 November 2015
 Cite this article:   
J. JAYACHANDRAN,R. MURALI SACHITHANANDAM. Performance investigation of artificial intelligence based controller for three phase four leg shunt active filter[J]. Front. Energy, 2015, 9(4): 446-460.
 URL:  
https://academic.hep.com.cn/fie/EN/10.1007/s11708-015-0378-2
https://academic.hep.com.cn/fie/EN/Y2015/V9/I4/446
Fig.1  Schematic power circuit diagram of 3P3W DSTATCOM and single phase inverter connected to 3P4W distribution system
Region
I II III IV V VI
Line voltage (V a) angle/(°) 0−60 60−120 120−180 180−240 240−300 300−360
Controlled vector current I p I a −I b I b −I c I c −I a
I n I c −I c I a −I a I b −I b
Fixed switches ON S bn S ap S cn S bp S an S cp
OFF S bp S an S cp S bn S ap S cn
Tab.1  Vector operating mechanism of proposed OCC
Fig.2  Block diagram of ANN based OCC for three leg VSC APF
Fig.3  Single phase APF control strategy
Fig.4  Exploded diagram of feed forward artificial neural network
Load conditions THD/% Proposed controller Conventional OCC controller Neutral current I sn (rms)/A
I La I Lb I Lc THD/% V c (rms)/V THD/% V c (rms)/V
I sa I sb I sc I sa I sb I sc
(1) 13.52 9.09 7.11 0.26 0.15 0.27 680 0.25 0.48 0.51 679.2 0.3264
(2) 12.16 10.91 8.15 2.66 0.85 1.55 680 2.85 1.31 1.61 679.2 0.5136
(3) 12.73 7.99 6.86 2.92 1.29 1.97 680 2.89 1.06 1.98 679.2 0.6336
(4) 13.12 8.99 7.06 0.23 0.17 0.23 680 0.22 0.37 0.38 679.2 0.2041
(5) 12.87 8.35 6.83 0.37 0.48 0.49 680 0.36 0.34 0.49 679.2 0.2792
(6) 14.69 9.33 7.24 0.41 0.13 0.66 680 0.41 0.73 1.09 679.2 0.732
(7) 13.07 11.73 8.92 3.17 1.39 1.49 680 3.32 2.18 1.65 679.2 0.8027
(8) 14.15 12.70 9.17 3.28 1.10 1.38 680 3.45 2.14 1.47 679.2 0.9419
(9) 9.68 6.09 5.46 4.47 3.42 3.73 680 3.77 2.92 3.39 679.2 0
Tab.2  Comparison of performance of DSTATCOM with proposed controller and conventional OCC controller for ideal voltage source condition
Load conditions THD/% Proposed controller Conventional OCC controller Neutral current I sn (rms)/A
I La I Lb I Lc THD/% V c (rms)/V THD/% V c (rms)/V
I sa I sb I sc I sa I sb I sc
(1) 9.84 17.77 8.23 2.30 2.34 2.22 680 2.28 2.41 2.31 679.2 0.3129
(2) 11.22 20.95 8.82 3.64 2.92 2.38 680 3.64 3.14 2.43 679.2 0.608
(3) 9.17 15.23 7.95 3.78 3.01 2.51 680 3.79 2.97 2.57 679.2 0.6542
(4) 9.75 17.19 8.16 2.28 2.33 2.20 680 2.26 2.38 2.26 679.2 0.2007
(5) 9.34 15.42 7.89 2.27 2.35 2.23 680 2.26 2.35 2.26 679.2 0.276
(6) 9.94 19.31 8.31 2.37 2.36 2.37 680 2.32 2.49 2.59 679.2 0.6883
(7) 12.27 23.22 9.77 4.16 3.63 2.54 680 4.05 3.72 2.60 679.2 0.9815
(8) 12.76 26.71 9.95 4.32 3.14 2.48 680 4.15 3.71 2.57 679.2 1.13
(9) 9.23 11.27 6.73 4.84 4.18 3.96 680 4.47 4.00 3.78 679.2 0
Tab.3  Comparison of performance of DSTATCOM with proposed controller and conventional OCC controller for unbalanced voltage source condition
Load conditions THD/% Proposed controller Conventional OCC controller Neutral current I sn (rms)/A
I La I Lb I Lc THD/% V c (rms)/V THD/% V c (rms)/V
I sa I sb I sc I sa I sb I sc
(1) 12.95 8.92 6.92 2.23 2.21 2.36 680 2.40 2.43 2.46 679.2 0.2804
(2) 12.41 11.49 8.20 3.71 2.54 2.92 680 4.08 2.98 2.99 679.2 0.5136
(3) 12.80 8.56 6.97 3.55 2.44 3.05 680 3.58 2.47 3.02 679.2 0.6336
(4) 13.21 9.58 7.14 2.35 2.30 2.38 680 2.37 2.39 2.40 679.2 0.2041
(5) 12.96 8.92 6.94 2.24 2.21 2.35 680 2.27 2.28 2.35 679.2 0.2792
(6) 12.91 8.83 6.96 2.27 2.23 2.45 680 2.47 2.54 2.72 679.2 0.4744
(7) 13.40 12.31 8.94 4.25 2.78 3.03 680 4.82 3.69 3.20 679.2 0.8027
(8) 14.45 13.28 9.19 4.39 2.80 3.08 680 5.09 3.83 3.21 679.2 0.9419
(9) 9.76 6.41 5.97 4.82 3.76 4.69 680 4.25 4.01 3.86 679.2 0
Tab.4  Comparison of performance of DSTATCOM with proposed controller and conventional OCC controller for balanced and distorted voltage source condition
Load conditions THD/% Proposed controller Conventional OCC controller Neutral current I sn (rms)/A
I La I Lb I Lc THD/% V c (rms)/V THD/% V c (rms)/V
I sa I sb I sc I sa I sb I sc
(1) 9.71 17.82 8.12 2.54 2.49 2.52 680 2.52 2.60 2.57 679.2 0.3129
(2) 11.11 21.03 8.69 3.89 3.07 2.63 680 3.99 3.37 2.37 679.2 0.608
(3) 9.05 15.34 7.86 3.88 3.13 2.74 680 3.81 3.09 2.73 679.2 0.6542
(4) 9.62 17.25 8.05 2.51 2.47 2.47 680 2.50 2.56 2.51 679.2 0.2007
(5) 9.21 15.54 7.80 2.44 2.48 2.50 680 2.47 2.48 2.50 679.2 0.276
(6) 9.80 19.38 8.22 2.63 2.55 2.74 680 2.61 2.71 2.85 679.2 0.6882
(7) 12.16 23.26 9.63 4.50 3.68 2.82 680 4.58 3.94 2.97 679.2 0.9815
(8) 12.67 26.78 9.82 4.72 3.41 2.85 680 4.82 4.06 3.07 679.2 1.113
(9) 9.21 11.27 6.77 4.94 4.02 4.29 680 4.45 4.38 3.64 679.2 0
Tab.5  Comparison of performance of DSTATCOM with proposed controller and conventional OCC controller for unbalanced and distorted voltage source condition
Case A Case B Case C Case D
Ideal voltage source condition: 415V, 50?Hz, with a phase difference of (0°, −120°, and+120°) Unbalanced voltage source conditions (both amplitude and phase): 415V, 50?Hz.
phase unbalance of (20°,
−120°, and+120°)
&
Amplitude unbalance of 15% sag in all three phases for the duration between 0.25 and 0.35?s		 Balanced and distorted voltage source condition: 415V, 50Hz with a phase difference of (0°, −120°, and+120°)
&
Distorted condition: 15% of 3rd order and 5th order harmonics for the duration between 0.35 and 0.5?s.		 Unbalanced (both amplitude and phase) and distorted voltage source condition: 415V, 50?Hz, with a
phase unbalance of (20°,
−120°, and+120°)
&
Amplitude unbalance of 10% sag in all three phases for the duration between 0.25 and 0.35?s
&
Distorted condition: 15% of 3rd order and 5th order harmonics for the duration between 0.35 and 0.5?s.
Tab.6  Details of various source voltage conditions
Fig.5  Dynamic performance of DSTATCOM under ideal voltage source condition
Fig.6  Dynamic performance of DSTATCOM under unbalanced sinusoidal voltage source condition
Fig.7  Dynamic performance of DSTATCOM under balanced and distorted voltage source condition
Fig.8  Dynamic performance of DSTATCOM under unbalanced sinusoidal voltage source condition and distorted voltage source condition
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