An Improved Adaptive Neural Network Detecting Approach to Harmonic Currents with Changeable Learning Parameters

2012 ◽  
Vol 433-440 ◽  
pp. 6546-6550
Author(s):  
Jun Xu
Keyword(s):  
Neural Network ◽  
Neural Networks ◽  
Computer Simulation ◽  
Active Power ◽  
Adaptive Neural Network ◽  
Active Power Filters ◽  
Adaptive Weights ◽  
Power Filters ◽  
Harmonic Currents ◽  
Adaptive Noise

Using the adaptive noise canceling technology, this paper proposes a new detecting approach to harmonics and reactive currents based on neural networks with changeable learning parameters. The structure of this neural network and the adaptive weights adjusting algorithm are presented. The contradiction of the detecting speed and the precision has been settled preferably. The proposed detecting approach can be used for detecting the harmonics and the reactive currents of active power filters. The results of the theoretical analysis and computer simulation confirm the validity of the approach.

scholarly journals Fundamental Active Current Adaptive Linear Neural Networks for Photovoltaic Shunt Active Power Filters

Energies ◽  
2016 ◽  
Vol 9 (6) ◽  
pp. 397 ◽  
Author(s):  
Muhammad Mohd Zainuri ◽  
Mohd Mohd Radzi ◽  
Azura Che Soh ◽  
Norman Mariun ◽  
Nasrudin Abd Rahim ◽  
...  
Keyword(s):  
Neural Networks ◽  
Active Power ◽  
Active Power Filters ◽  
Power Filters

scholarly journals Reduction of Current Harmonics by Cascaded Multilevel Inverter based Shunt Active Power Filters

2020 ◽  
Vol 8 (5) ◽  
pp. 4952-4961
Keyword(s):  
Active Power ◽  
Multilevel Inverter ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Active Power Filters ◽  
Multilevel Inverters ◽  
Power Filters ◽  
Harmonic Currents ◽  
Non Linear ◽  
Cascaded Multilevel Inverter

Majority of loads in use today are power electronics based non-linear devices. Despite being compact and providing low energy consumption these loads generate inherent harmonics. Harmonics have several adverse effects such as interference with the communication lines, incorrect meter readings, increased losses, increased heating of electrical and sensitive electronic equipment. Sophisticated power electronic converter based filters named as Shunt Active Power Filters (SAPF) are widely being employed that provide superior harmonic filtering capabilities. Basic objective of SAPF is to generate or absorb currents that compensate harmonic currents produced by non- linear loads. These currents should be opposite in phase but have equivalent magnitude as that of harmonic currents. As compared to Diode-Clamped and Flying capacitor multilevel inverters, Cascaded multilevel configuration is employed for many applications due to ease of control and simple structure. In this research paper, power quality in a three-phase threewire system is improved by reducing source side current harmonics produced by a non-linear load. Initially a three-level Cascaded multilevel inverter based SAPF is developed and its performance is analyzed by using advanced Adaptive Neuro Fuzzy Inference System (ANFIS) controller. DC link capacitor voltage and percentage Total Harmonic Distortion (%THD) in source currents is measured at PCC for balanced loading conditions and results are compared. In this paper, it is also proposed to incorporate multilevel inverter topology concepts by employing Five-Level and Seven-Level Cascaded Multilevel Inverters as VSI circuit for SAPF. Performance of these multilevel Shunt Active power filters is analyzed by ANFIS controller. Instantaneous Active-Reactive power theory is implemented to compute reference compensating currents for all Shunt Active power filter models. Phase Disposition type Pulse Width modulation is chosen for generating gate pulses for VSI circuits of all Cascaded multilevel inverter configurations. Three-level, Five-level and Seven-level Shunt active power filter models are developed and simulated using MATLAB/ Simulink and results are presented.

ADVANCED POWER ELECTRONICS FOR REDUCING MAINS POLLUTION — ACTIVE POWER FILTERS AND OPTIMIZED UTILITY INTERFACES

1995 ◽  
Vol 05 (04) ◽  
pp. 789-811 ◽  
Author(s):  
J. HÄFNER ◽  
M. AREDES ◽  
K. HEUMANN
Keyword(s):  
Reactive Power ◽  
Active Power ◽  
Voltage Source ◽  
Active Power Filters ◽  
Utility Interface ◽  
Power Filters ◽  
Harmonic Currents ◽  
Sinusoidal Input ◽  
Thyristor Converters ◽  
Four Quadrant

Rapid advances in turn-off semiconductor elements offer new opportunities for reactive power compensation and reduction of harmonics in energy supply systems. Non-linear consumers and also solid state power electronic equipment like diode rectifiers and thyristor converters disturb the utility voltage waveform by injecting harmonic currents into the utility grid. Their need of reactive power results in higher line currents and thereby in an increase of the rated power of the supply system. Active power filters can be used to compensate the harmonic currents, to balance unbalanced systems and to provide reactive power to the load with small storage elements. Optimized utility interfaces are controlled to ensure sinusoidal input currents of the load with unity power factor. Both, the investigated active power filter as well as the optimized utility interface are based on a four-quadrant switch-mode voltage source inverter.

Power Quality Improvement of High Voltage DC Link using Modified Shunt Active Power Filter

2018 ◽  
Vol 1 (1) ◽  
pp. 54-66
Author(s):  
Rakan Khalil Antar ◽  
Basil Mohammed Saied ◽  
Rafid Ahmed Khalil
Keyword(s):  
Power Quality ◽  
High Voltage ◽  
Pulse Width Modulation ◽  
Active Power Filter ◽  
Active Power ◽  
Voltage Source ◽  
Active Power Filters ◽  
Power Filter ◽  
Power Filters ◽  
Power Quality Improvement

A new control strategy for active power filters is proposed, modeled and implemented in order to improve the power quality of a line commutated converter High voltage DC link. The ability of reactive power and harmonics reductions are generally met by using passive and active power filters. In this paper, modified active power filter with a modified harmonics pulse width modulation algorithm is used to minimize the source harmonics and force the AC supply current to be in the same phase with AC voltage source at both sending and receiving sides of a line commutated converter high voltage DC link. Therefore, it is considered as power factor corrector and harmonics eliminator with random variations in the load current. The modified harmonics pulse width modulation algorithm is applicable for active power filter based on a three-phase five-level and seven-level cascaded H-bridge voltage source inverter. Simulation results show that the suggested modified multilevel active power filters improve total harmonics distortion of both voltage and current with almost unity effective power factor at both AC sides of high voltage DC link. Therefore, modified active power filter is an effective tool for power quality improvement and preferable for line commutated converter high voltage DC link at different load conditions.

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