AHF&SVG in Data Center Industry
The Active Harmonic Filter adopts advanced power electronics technology to detect the harmonics in the grid in real time, generate the reverse phase compensation current through the converter, and dynamically filter out the harmonics in the grid.Static Var Generator can be real-time dynamic compensation, can compensate for the perceptual reactive power and the tolerance of the reactive power, and will not occur overfill, underfill, can stabilize the system voltage.
The Background
Due to the uninterrupted load power supply in the data center machine room, a large number of UPS and switching power supply and frequency conversion air conditioning are used.The input levels of these devices are three-phase arrangement, generating a large number of harmonics.Switch the power supply and UPS equipment to first rectify the AC into DC, and then through the secondary transformation, into the corresponding DC and AC.During the period, the primary current of the transformer is controlled through the switch pipe, not only generating harmonic during the rectification, but also reflects the high frequency harmonic to the power supply, resulting in high neutral current of the distribution transformer, and the harmonic will be polluted to the grid through the distribution transformer.
The PQ Problem
Both the switching power supply and the input of the UPS generate a harmonic current, and the final harmonic current is pooled on the total generating row.A large amount of harmonic current will cause the following harm to the communication room: harmonic current will interfere with the communication signals of adjacent wires.The harmonic current in the power grid increases the total current, which can easily lead to the misaction of the protection devices and lead to delayed work accidents.Harmonics will reduce the stability and life of equipment, cables, transformers and other equipment.Harmonic current occupies the transformer capacity, increases the load rate of the transformer, and may cause the transformer noise.If the necessary harmonic control measures are not taken, it will bring serious harmonic pollution to the input power grid.When serious, it will endanger the safe operation of the input grid and various electrical equipment across the grid in this grid.
The Solution of YTPQC-AHF and YTPQC-SVG
There is a serious current harmonic problem in a data center, and the harmonic current distortion rate reaches 32.8%, mainly for 3,5 and 7 harmonics.Through field testing and simulation analysis, our technical team gives a configuration scheme of 1200A Active Power Filter and 600Kvar Static Var Generator for harmonic filtering and reactive power compensation.
The Technical Performance
After the YTPQC-APF Active Power Filter device management, the field harmonic current decline range is very obvious, the current distortion rate on the site will decrease from 32.8% to about 1.5%, through the YTPQC-SVG Static Var Generator, and the power factor in the site is increased from 0.94 to 1.0.
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