Chemical industry and new energy industry

Release time:

2021-04-07 10:32

sort： Industry Solutions

Application background:

1), the load type of the above industry is mainly power electronic rectifier power supply and variable frequency speed control device will produce 5 times, 7 times, 9 times, 11 times, 13 times and other harmonics, with the popularity of 12 pulse and 24 pulse rectifier, low harmonics gradually reduced, 23 times, 25 times harmonic current gradually increased;

2) The working mode of the equipment is dynamic impact operation. The single machine capacity of the equipment is large, and the amplitude and frequency changes of active power and reactive power are large, and have certain periodicity.

3), causing system voltage fluctuations and flicker, low power factor, three-phase current imbalance, line loss increases, harmonic content exceeds the standard, etc.

Recommended scheme:

The digital reactive power generator (DVG) and active power filter (APF) are installed on the low-voltage side bus (generally 0.4kV) to improve the power factor, solve the reactive power fluctuation and avoid the phenomenon of overcompensation, and filter out the higher harmonics.

Design Capacity of Active Filter = Operating Current * Current Distortion Rate

Note: In order to make the compensation effect better, there is generally a margin, so the calculation capacity is generally multiplied by the 1.2 of the effective harmonic current at the maximum load rate as the final configuration capacity.

Customer Benefits:

Power quality meets national standards and avoids fines from power companies

The improvement of power quality makes the power supply system safe and reliable

Effectively control harmonics to avoid interference to sensitive equipment

Reduce equipment loss, reduce equipment maintenance costs, and extend service life

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