This article presents a study on the use of the concept of direct power control (DPC) based on intelligent techniques in the control of a shunt active power filter (SAPF). In order to improve harmonic mitigation and reactive power compensation capabilities, the conventional switching table is replaced by a fuzzy inference system to generate the switching sequences of the shunt active power filter. To ensure an active power exchange stable and efficient, the DC voltage of the SAPF in controlled using an integrated proportional controller (PI) optimized by a heuristic optimization technique based on genetic algorithms (GA). The combination of two intelligent techniques in this proposed control strategy makes it possible to reduce ripples in different variables of the SAPF, to maintain the direct voltage at their reference value and to improve the THD of the grid current. The numerical simulation results obtained under Matlab / Simulink confirm the importance of the SAPF's proposed control technique.
Słowa kluczowe: Shunt active power filter, direct power control, fuzzy inference system, genetic algorithm.
W artykule opisano wykorzystanie metody DPC (direct power control) do poprawy parametrów bocznikowego filtru aktywnego SAPF. Konwencjonalna tabela przełączeń jest zastąpiona przez system logiki rozmytej. Do optymalizacji filtru wykorzystano też algorytm genetyczny.
Keywords: aktywny filtr bocznikowy SAPF, logika rozmyta, algorytm genetyczny
Harmonic distortion is generated by non-linear loads connected to the grid that absorb non-sinusoidal currents . These current harmonics will successively generate harmonic voltages at the different grid connection points . Many solutions for cleaning up electricity networks have already been proposed in the literature [3, 4]. Active power filters (APF) are to date the most appropriate advanced pollution control solutions [5, 6], APF has several advantages such as the elimination of harmonic currents, reactive energy compensation, rebalancing of non-linear load currents . The principle of parallel active filters was introduced by . The principle is based on the injection of harmonic currents or voltages opposite to those generated by the nonlinear load so as to have a current or voltage resulting quasi-sinusoidal. The performance of the active filter depends on the control strategy adopted. Several control strategies have been proposed in the literature . The DPC concept is equivalent to direct torque control (DTC) one for electrical machines . The principle is based on the selection of a voltage vector using a switching table, direct self-control, or space vector modulation . Among these DPC techniques, the strategy of voltage vector selection using a switching table is widely studied and marketed. This is due to its concept which is simple to implement. The selection of the voltage vector is based on the active power error, reactive power and therefore the position of the voltage vector. The most disadvantages in conventional DPC are: the system doesn’t differentiate between very small and relatively large errors of the active and reactive powers which can affect the stability of the system response, the occurrence of ripples at different SAPF quantities, additionally the utilization of conventional analysis methods to select the parameters of the PI controller need determining a transfer fun [...]
 A. Semmah, A. Massoum, H. Hamdaoui, P. Wira,Comparative Study of PI and Fuzzy DC Voltage Control for a DPC- PWM Rectifier, Przegląd Elektrotechniczny, 87 (2011), N° 10, 355- 359  Dehini R, Berbaoui R, identification of harmonic currents in response to voltage disturbance, Rev. Roum. Sci. Techn.- Électrotechn. et Énerg, vol. 62, (2017), 346-351.  Amaia L, Heredia B, Advanced controls of systems dedicated to improving energy quality from low voltage to voltage rise, thesis, National Polytechnic Institute of Grenoble, France, (2006)  N. G. Apte, V. N. Bapat, A. N. Jog, A shunt active filter for reactive power compensation and harmonic mitigation, The 7th International Conference on Power Electronics, IEEE, (2008), 672-676  H. R. Imani JAJARMI, Azah MOHAMED, H. SHAREEF, SUBIYANTO, Adaptive interval type 2 fuzzy hysteresis-band current-controlled active power filter for power quality improvement, Przegląd Elektrotechniczny, (2014), 140-145  N K Nguyen, Neuromimetic approach for the identification and control of electrical systems: application to active filtering and synchronous actuators, University of Haute Alsace, Mulhouse, France, (2010)  Hind Djeghloud, Active power filter, PhD thesis on Electrical Machines, university of Mentouri, Constantine, Algeria (2007)  Sasaki H, Machida T, A new method to eliminate AC harmonic currents by magnetic flux compensation-considerations on basic design, IEEE Trans. Power Appl. Syst., vol. PAS-90, No. 5, (1971), 2009-2019  Attaianese, C., Tomasso, G., Damiano, A., Marongiu, I., Perfetto, A.: Direct torque and flux control of induction motor drives. In: Proceedings of the International Conference on Power Electronics and Drive Systems, vol. 2, (1997), 642-648  Semmah A, development of different control strategies for active filters for industrial networks, PhD thesis in Electrical Engineering, university of Sidi Bel Abbes, Algeria, (2012)  Saifullah K, Genetic Algorithm Application in Shunt Active Power Filter Applied in Constant Frequency Aircraft System, journal of Aerospace Engineering & Technology, Volume 8, (2018), 44-50  Yacef. Rima, strategy for the global optimization of APF Based on genetic algorithms, Magister's memory, university of Setif, Algeria, (2018).  Wenyi Zhang, Xiaodan Meng, Liao Jiang, Genetic Algorithm for Selective Harmonic Elimination PWM Control, the Eighth International Conference on Intelligent Systems and Knowledge Engineering, (2014), 799-809 Yi-Sheng Zhou and Lin-Ying Lai, Optimal Design for Fuzzy Controllers by Genetic Algorithms, IEEE transactions on industry applications, vol. 36, (2000)