| With the modern development of various sectors of the national economy, In a variety of power electronic equipment consisting mainly of large nonlinear loads are widely used, causing the power grid harmonic distortion increases unceasingly, has seriously affected the quality of electric energy, Harmonic restraint problem are being more and more attention. The installation of the filter compensation device is one of the basic ideas of governance harmonic pollution, filter reactors and filter capacitors in series composed of single-tuned harmonic filter is composed of the basic unit of the power system filtering device, used to filter out a certain number of the harmonic current. Single-tuned harmonic filter is the use of the inductive reactance of the reactor and capacitor reactance is just in the absorption of the harmonic frequency occurs when the series resonance, so that most of the harmonic current is absorbed in the filter, rather than injected into the utility grid, so that the gridrate of voltage sine wave distortion and harmonic currents injected into the grid substantially reduced. At the same time, the filter capacitors to provide the fundamental reactive power to the grid. Single-tuned harmonic filter structure is simple, inexpensive, and reliable operation, and therefore has been widely applied. This paper describes the basic principles of the single-tuned harmonic filter, the design conditions and design criteria and methods, and single-tuned harmonic filters in practical engineering design to solve the problem of IF furnace put into operation a massive injection of harmonic currents to the grid. The filtering device is put into use, the harmonic currents injected into the common connection point to meet the national standard limits, effective restraint the harmonic pollution, optimize the supply environment, And filter the harmonic at the same time, but also the fundamental reactive power compensationimprove power factor, and significant economic benefits. |
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