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Compensation and harmonic disturbance filtering techniques

What are harmonics?

Non linear loads, such as: rectifiers, inverters, speed variators, furnaces, etc. that absorb periodic non-sine wave currents from the network. Said currents are composed of a fundamental frequency component rated at 50 or 60 Hz, plus a series of overlapping currents, with frequencies that are multiples of the fundamental frequency. This is how we define ELECTRICAL HARMONICS, which generate major technical and economic costs.

The result is a deformation of the current (and consequently, voltage) leading to series of associated secondary effects.

Distorted wave shape decomposition

Effects of harmonics

The main effects of the voltage and current harmonics in a power system can be cited as:

  • The possibility of amplification of some harmonics as a result of serial and parallel resonance
  • Reduction in the performance of energy generation, transmision, and usage systems
  • The ageing of the grid isolation components and as a consequence, energy reduction

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