Active Filter Using A New Direct Power Control (DPC0) Under Imbalanced And Distorted Conditions Kamel Djazia LEPCI, University of Sétif, Algeria Department of Electronics, University of M'sila, Algeria djazkam@yhoo.fr Mustapha sarra LEPCI, University of Sétif, Algeria Department of Electronics, University of BBA, Algéria sarramust1@yahoo.fr Fateh Krim LEPCI, University of Sétif, Algeria Department of Electronics, Universityof Setif, Algeria krim f ieee org@yahoo fr LEPCI: Power electronics and industrial control laboratory Abstract—In this paper, we present a new technique for active compensate of harmonics and reactive power, based on the method of instantaneous active and reactive power by introducing a new Direct Power Control called DPC0 where we imposed a reference power (pref ) as null and the reference reactive power (qref) which was also imposed null with conventional DPC. We have also introduced two extractions multivariable filters "MVF" which are highly selective, and consequently making the compensation currents harmonics and reactives to obtain a unity power factor, and a good sinusoidal current source even under imbalanced and distorted conditions. The simulation was done in the Matlab/Simulink environment, for system power diode PD3 debits on an inductive load. The simulation results showed clearly the effectiveness of this new technique. Key words: Active filters; Direct power Control DPC; DPC0; Harmonic; instantaneous active power. I. INTRODUCTION The harmonic pollution affects all grids industry or domestic. No modern environment can escape to this pollution equipment such as computers, servers, air conditioning, speed rectifiers, discharge lamps, microwave ovens, televisions, halogen lights...All these loads so called "non-linear"; participate considerably in damaging the "quality" of the grid current and voltage [1] [2]. The different identification methods of disturbing current can be grouped into two families. The first one uses the fast Fourier transform in the frequency domain to extract the current harmonics. This method is well suited for loads where the harmonic content varies slowly. It also gives the advantage of select the harmonics individually and only choose to compensate the most predominant. It should be noted that this method requires a lot of computing power to achieve real-time all the necessary transformations to extract the harmonics [3] The second family is based on the calculation of instantaneous power in the time domain. Some of these methods are based on the calculation of harmonic powers of nonlinear loads. Others may be used to compensate for both the harmonic currents and the reactive power, based on the subtraction of the fundamental active portion of the total current. [4] The method of instantaneous active and reactive powers was originally developed by Akagi [1] [2] [5]. This method has the advantage of choosing the perturbation to compensate with precision, rapidity and easiness of implementation. The principle of direct control of power electronic converters in MLI was proposed for the first time in 1986 [6] and was later developed in many applications. The purpose of the direct control of these systems was to eliminate the block pulse width modulation and loops internal regulations of controlled variables, replacing them with a predetermined switching table, whose entries are the tracking errors reference controlled variables and the output is the control vector. The first configuration of this type of control has been proposed in [7], for the direct control of instantaneous active and reactive powers of three-phase PWM rectifier without voltage sensors network. After, this approach is developed, and various configurations have been proposed [8]. The common objective of this review was to ensure the removal of sinusoidal currents while guaranteeing a unity power factor with a decoupled control of active and reactive power. [9] The DPC standard imposes the reference reactive power (qref) as null, while the reference active power (pref) is calculated from the product of the controller output DC bus with the voltage Vdc. The proposed DPC0 requires two references ( pref and qref) as null. This paper, presents the study of a new technique of control called DPC0, based on the DPC technique but with a modification of the reference power (pref ). In section II, we have given the famous characteristics of the quality enenrgy such as power factor and harmonic distortion rate. The different types of passive and active filtering were discussed in section III. Section IV contains the principle of classical DPC, heavers the principle of DPC0 is given in Section V, followed by the results of simulation in Matlab-Simulink in Section VI. At the end, we give a conclusion about the advantages of proposed technique DPC0. Proceedings of The first International Conference on Nanoelectronics, Communications and Renewable Energy 2013 111 ICNCRE ’13 ISBN : 978-81-925233-8-5 www.edlib.asdf.res.in Downloaded from www.edlib.asdf.res.in