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Gurusamy, G.
- Supervisory Trained Sine Wave Template for Reduction of Harmonic Source Current from Computer Loads
Authors
1 Anna University, Coimbatore, IN
2 Anna University, Chennai, IN
Source
Digital Image Processing, Vol 2, No 9 (2010), Pagination: 300-306Abstract
Recently, power quality is referred to the ability of the electric utilities to supply electric power without interruption. Today, the phrase encompasses the deviation from a perfect sinusoidal waveform leading to reduction of power quality. Power quality also relates to short-term transients as well as continuous state distortions in power system. If this harmonics are an intruded in the source means it gives continuous state problem with dangerous results. However harmonics can be present in current, voltage, or both. It is estimated that as many as 60% of all electrical devices operate with non-linear current draw. The utility companies invest millions of dollars each year to ensure that voltage supplied to their customers is as close as possible to a sinusoidal waveform. In this paper harmonics are examined from various loads and method of reductions are defined by using intelligent controllers.
Keywords
Harmonics, UPS, Nonlinear Load, Total Current Harmonic Distortion (THDi), Intelligent Controller:Artificial Neural Network (ANN).
- Back Propagated NN Based Active Source Current Compensating for Utility Affecting Loads
Authors
1 Department of Electrical and Electronics Engineering, K.S.R. College of Technology, Tamil Nadu, IN
2 Department of Electrical and Electronics Engineering, Bannari Amman Institute of Technology, Tamil Nadu, IN
Source
Artificial Intelligent Systems and Machine Learning, Vol 2, No 8 (2010), Pagination: 169-174Abstract
The area of Power Quality Issues and Remedial Measures has received considerable attention from the Power Utilities, Power Consumers and Power Equipment Manufacturers over the last decade. Large-scale use of bulk power Thyristor Converters and Industrial Electronic Equipment resulted in waveform pollution at all levels in the Power Systems from mid-eighties onwards. The issue became more serious with the proliferation of non-linear loads (rectifiers, arc furnaces, variable speed drives, UPS, computer load, printers, domestic electronic equipment etc.) in the Industrial, Commercial and Residential sectors in the past decade. These loads, as a rule, draw nonsinusoidal currents from the supply and lead to voltage distortion and related system problems. With the wide spread use of Power Electronics at all levels, the polluting loads became spread out system wide and Power Quality Improvement Measures concentrated at a few bulk power points turned out to be insufficient to mitigate system wide problems.The mitigation strategies like passive filtering, active shunt and series power filtering, static VAr compensation, etc are proposed. From these the active harmonic filtering strategies are recently used for active wave shaping of source current and in the protection of utilities. This alleviation of Power quality by Mitigation Technologies is provided effectively by using intelligent systems.