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Harmonic problems are common not only in industrial applications but in commercial buildings as well. This is primarily due to the switched mode power supply (SMPS) and variable frequency drives. A K-rated transformer is one which is used to deal with harmonic generating loads. K-rated transformers are sized appropriately to handle the additional heat produced by harmonic component. The Active Power...
In this paper, a novel neural network based phase locked loop (PLL) less reference current computation method for active power filter (APF) control under non-ideal mains voltage conditions with different load condition is proposed. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been designed to extract fundamental frequency components from non-sinusoidal...
This paper presents a new method for harmonic and reactive power compensation with power factor improvement using an artificial neural network (ANN) and a new control algorithm for active power filter (APF) for power quality conditioning for variable load under non-ideal mains voltage conditions. The neural network controller comprises two similar adaptive linear neurons (ADALINE), and it has been...
Active power filter (APF) can resolve the harmonic pollution in the power network well, but the cost of APF is expensive, it need to be optimal configuration usually. The models of single and multi APF are established with making the average of total voltage harmonic distortion as the object function and the total harmonic distortion of different node as constraints in the paper. By applying improved...
This work presents a Neural Networks based intelligent Active Power Filter control unit for harmonics current elimination. The paper is centered on an Improved Three-Monophase (ITM) method and a novel one called Two-Phase Flow (TPF) method for detecting harmonics from disturbed currents due to non linear loads in electric power systems. The TPF method introduces new currents decomposition in the DQ-space...
This contribution deals with a shunt-type active power filter designed mainly for railway applications (50-Hz and 16.7-Hz electrification systems) which is able to compensate undesired harmonic currents as well as reactive power. Its control algorithm employs an optimized DFT-based fundamental current and voltage estimator generating an accurate control reference signal. The APF configuration, the...
The model and the normal control method of the cascaded H-bridge active power filter is described firstly in this paper. However, problems exist in the normal control. One of the main problems is the unbalance of DC capacitor voltages of the H-bridge units. In this paper, an improved method for DC capacitor voltages control of the cascaded H-bridge active power filter is presented. With slightly shifting...
With the continuous development of water-saving irrigation, agricultural productpsilas deep process, greenhouse control in the agriculture, more and more variable frequency equipments, rectifier devices and other power electronic equipments have been used. But owing to the use of these equipments, harmonic pollution problem in power grid is more serious. Active filter is an effective method to the...
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