Back Propagated NN Based Active Source Current Compensating for Utility Affecting Loads

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.