3. Power grid and disturbances
For an energy network, four main disturbances and their possible combinations are identified.
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Amplitude variations
These are not the slow variations in voltage that are corrected by the transformer's on-load regulators, but rapid variations in voltage, in the form of voltage dips or sudden jolts, either isolated or more or less repetitive, regular (square-wave) or irregular.
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Voltage waveform changes
The wave is no longer sinusoidal and can be considered as the superposition of a wave with a fundamental frequency of 50 Hz, harmonic voltages whose frequency is an integer multiple of the fundamental frequency, and interharmonic voltages at any frequency.
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Three-phase system asymmetry...
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Power grid and disturbances
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