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This work approximates the selective harmonic elimination problem using Artificial Neural Networks (ANN) to generate the switching angles in an 11-level full bridge cascade inverter powered by five varying DC input sources. Five 195 W solar panels were used as the DC source for each full bridge. The angles were chosen such that the fundamental was kept constant and the low order harmonics were minimized...
This paper analyses the mathematic model of multiphase induction motor, and the magnetic motive force generated by the harmonic currents. Compared to three phase drives, the multiphase motor drives have the advantage of performances on dead-time effect, common mode voltage, technology of non-sinusoidal source fed and reliability. A universal multi-phase voltage source inverter (VSI) is constructed...
This paper presents a fast technique to generate the current reference to compensate for the harmonics and reactive power in a shunt type active power filter (APF). A voltage source inverter (VSI) is operated in the current controlled mode for this purpose. For fast generation of the reference current in the APF, the DC link voltage of the VSI is always sensed and an initial estimate is derived through...
In this paper, a fault diagnostic system in a multilevel- inverter using a adaptive back-propagation neural network is developed. An adaptive back propagation neural network classification is applied to the fault diagnosis of a MLI system to avoid the difficulties in using mathematical models. A multilayer perceptron (MLP) network with 40 - 12 - 8 architecture is used to identify the type and location...
In this paper, a fast and simple technique to generate the current reference to compensate for the harmonics and reactive power in a shunt type active power filter (APF) is developed. A voltage source inverter (VSI) is operated in the current controlled mode for this purpose. For fast generation of the reference current in the APF, the dc link voltage of the VSI is always sensed and an initial estimate...
This paper presents a complete strategy for harmonics identification and neural control of a three-phase voltage inverter used for the power active filtering. Based on the use of neural techniques, this approach of compensation is done in two stages. The first stage extracts the harmonic currents with the diphase currents method by using Adaline neural networks. The second stage injects the harmonic...
In this paper, two efficient and reliable neural approaches to control an inverter are developed. The objective is to improve the compensation performance of a conventional active power filter (APF) with a homogeneous neural structure allowing an efficient hardware implementation. The first control approach is based on a neural PI regulator. This technique uses an Adaline to determine the PI parameters...
Estimation of optimum switching angles for multilevel converters so as to produce the required fundamental voltage while at the same time eliminate specified lower order harmonics through Artificial Neural Networks (ANNs) is presented. The proposed technique uses the best performance solutions (lowest THD solutions) as the training data set for proposed ANN system. This technique can be applied to...
A new approach for selective harmonic elimination in a 7-level cascaded multilevel inverter with separate DC sources will be presented. As opposed to previous research in this area, the DC sources feeding the multilevel inverter are considered to be varying in time. This method uses genetic algorithms to obtain switching angles offline for different DC source values and uses neural networks to determine...
This paper is devoted to artificial neural network (ANN) control of a nine levels neutral point clamped (NPC) voltage inverter based on the selective harmonics elimination. Initially, we determine all the adequate switching angles for the control of the nine levels inverter switches, in order to eliminate the 5th, 7th and 11th harmonics. Then, a multilayer ANN is elaborated, which is able to reproduce...
This paper deals with special active power line conditioner (APLC), which is based, the same as UPQC, on integration of series and shunt power converters sharing a common DC link. In this paper the main purpose of the shunt inverter is to compensate the reactive power and current harmonics caused by nonlinear load. In addition, a simple structure feed forward neural network is presented for the separate...
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