MATLAB-Simulink Model Based Shunt Active Power Filter Using Fuzzy Logic Controller to Minimize the Harmonics


The issue of value electrical vitality gave to the clients has emerged. This is because of the expanding nearness in system of nonlinear loads.They establish a consonant contamination wellspring of the system, which produce numerous aggravations, and exasperate the ideal task of electrical types of gear. This work, proposed an answer for take out the sounds presented by the nonlinear burdens. It displays the investigation and reenactment utilizing Matlab Simulink of a active power filter (APF) repaying the sounds and receptive power made by nonlinear loads in unfaltering and in drifters. The convenience of the reenactment way to deal with APF is shown , have a superior power quality knowledge utilizing Matlab Simulink so as to grow new fuzzy logic controller based dynamic power channel.



Figure 1 Block diagram of Basic Active Power Filter



 Fig. 2 Three phase voltage and current waveform with non linear load

 Fig.3 THD analysis of three phase voltage waveform with nonlinear load

 Fig.4 Three phase voltages and current waveform with shunt active power filter with connected fuzzy logic controller

 Fig.5 THD analysis of voltages with shunt active power filter using fuzzy logic controller



The paper exhibits the utilization of the fuzzy logic controller to control the repaying voltage. The Mamdani max-min approach is utilized for the fluffy induction and the defuzzification technique, separately. The structure of info and yield enrollment for the fluffy rationale controller is essential for the framework execution. The reproduction results demonstrate that the fuzzy logic controller gives a decent execution to control the remunerating voltage of shunt dynamic power channel. The %THD of the voltages at PCC point can be pursued the IEEE Std. 519-1992.


Convertible Unified Power Quality Conditioner to mitigate voltage and current imperfections


This paper proposes a novel convertible unified power quality conditioner (CUPQC) by utilizing three voltage source converters (VSCs) which are associated with a multi-transport/multifeeder dissemination framework to relieve current and voltage blemishes. The control execution of the VSCs is described by at least six circuit open/close switches configurable in at least seventeen blends to empower the CUPQC to work as shunt and arrangement dynamic power channels (APFs), bound together power quality conditioner (UPQC), interline UPQC (IUPQC), multi-converter UPQC (MC-UPQC) and summed up UPQC (GUPQC). The recreation and remuneration execution investigation of CUPQC depend on PSCAD/EMTDC.


Fig.1 Schematic representation of proposed CUPQC


 Fig.2. Feeder1 (a) Load current (b) Source voltage


 Fig.3. Feeder1 (a) Compensation currents (b) Compensation voltages

Fig.4. Feeder1 (a) Source currents (b) Load voltages

Fig.5. Feeder1 THD spectrum (a) Currents (b) Voltages

Fig.6. Feeder3 source voltage

Fig.7. Feeder3 compensation voltage

Fig.8. Feeder3 load voltages

Fig.9. Feeder3 voltage THD before and after compensation

Fig.10. (a) Feeder1source voltage (b) Feeder2 source voltage (c) Feeder3 load current

Fig.11. (a) Feeder1 compensation voltages (b) Feeder2 compensation

voltages(c) Feeder3 compensation currents

Fig.12. (a) Feeder1 load voltages (b) Feeder2 load voltages (c) Feeder3 source Currents

Fig.13. THD before and after compensation (a) Feeder1 voltage (b) Feeder2 voltage (c) Feeder3 current

Fig.14. RMS voltage (a) Feeder1 (b) Feeder2


In this paper the execution of the proposed CUPQC in three methods of activity as UPQC, MC-UPQC and GUPQC on a multi-transport/multi-feeder dispersion framework is approved by reenactment results. The working methods of the novel power quality conditioner in 17 unique modes for remuneration of flows and voltage interferences are unmistakably clarified. As an expansion to this examination, the creators are chipping away at a model for portrayal and testing of the proposed CUPQC.

Real Time Control of an Active Power Filter under Distorted Voltage Condition


This paper, presents three phase shunt active filter under distorted voltage condition, the active power filter control is based on the use of self-tuning filter (STF) for reference current generation and on space vector PWM for generation of pulses. The dc capacitor voltage is controlled by a classical PI controller. The diode rectifier feed RL load is taken as a nonlinear load. The self-tuning filter allows extracting directly the voltage and current fundamental components in the axis without phase locked loop (PLL) under distorted voltage condition. The experiment analysis is made based on working under distorted voltage condition, and the total harmonic distortion of source current after compensation .Self tuning filter based extraction technique is good under distorted voltage conditions. The total harmonic distortion (THD) of source current is fully reduced. The effectiveness of the method is theoretically studied and verified by experimentation.


  1. active power filters
  2. dSPACE1104
  3. real time
  4. STF
  5. SVM




Figure 1. Active Power Filter



 Figure 2. The source voltage

Figure 3. The load current

Figure 4. Source current

Figure 5. Filter current and its reference

Figure 6. The DC voltage

Figure 7. Load current’s harmonic spectrum

Figure 8. Source current’s harmonic spectrum


A modified pq theory control technique applied to a three-phase Shunt Power Filter is proposed. The appropriate control strategy for removing harmonics caused by non-linear loads is developed. The main advantage of the proposed method is its simplicity (no PLL circuit needed) and its efficiency in non-ideal voltage condition. The use of SVPWM method allows to the inverter to fellow its reference accurately which increase the performance of the active filter. The experiment results show the efficiency of the proposed method in terms of harmonic reduction as shown in Figure12, the THD obtained by the new control technique has been drastically reduced.


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[2] G. W. Chang and C. M. Yeh, “Optimisation-based strategy for shunt active power filter control under non-ideal supply voltages”, IEE Proceedings – Electric Power Applications, vol. 152, no. 2, p. 182, 2005.

[3] S. George and V. Agarwal, “A DSP Based Optimal Algorithm for Shunt Active Filter Under Nonsinusoidal Supply and Unbalanced Load Conditions”, Power Electronics, IEEE Transactions on, vol. 22, no. 2, pp. 593 –601, Mar. 2007.

[4] M. I. M. Montero, E. R. Cadaval, and F. B. Gonzalez, “Comparison of Control Strategies for Shunt Active Power Filters in Three-Phase Four-Wire Systems”, Power Electronics, IEEE Transactions on, vol. 22, no. 1, pp. 229 –236, Jan. 2007.

[5] M. Abdusalam, P. Poure, and S. Saadate, “Hardware implementation of a three-phase active filter system with harmonic isolation based on self-tuning-filter”, in IEEE Power Electronics Specialists  Conference, 2008. PESC 2008, 2008, pp. 2875–2881.,