How to manage harmonic current pollution from UPS in textile factories?
Time：
2019-01-05
Harmonic Control Typical Case in the Textile Industry (Guangdong Minxing Wool Knitting Co., Ltd.)
Project Background: A certain textile factory's main loads are high-capacity UPS and computer knitting machines. The UPS provides high-quality power with high voltage regulation accuracy and low waveform distortion. However, since the UPS is a nonlinear load, the rectifier in the UPS generates a large amount of harmonic current, resulting in a high current distortion rate on the grid side. This not only causes harmonic pollution to the power grid but also affects the normal operation of the reactive power compensation cabinet, necessitating harmonic control.
Control Plan: Based on on-site test results, it was found that the reason the reactive power compensation cabinet could not be normally engaged was due to the harmonic current generated by the UPS.
Typical Case of Harmonic Control in the Textile Industry (Guangdong Minxing Woolen Knitting Co., Ltd.)
Project Background:
A certain textile factory's main loads are large-capacity UPS and computer looms. The UPS provides high-quality power with high voltage regulation accuracy and low waveform distortion to the loads. However, since the UPS is a nonlinear load, the rectifier in the UPS generates a large amount of harmonic current, resulting in a high current distortion rate on the grid side, causing harmonic pollution to the power grid and also affecting the normal operation of the reactive power compensation cabinet, necessitating harmonic control.
Control Plan:
Based on on-site test results, it was found that the reason the reactive power compensation cabinet could not operate normally was that the harmonic current generated by the UPS was amplified by the capacitors of the reactive power compensation cabinet, causing overcurrent and tripping. Therefore, using the active power filter independently developed by our company can achieve the purpose of suppressing harmonics;
Control Effect:
The following is a comparison chart of current harmonics before and after control, taking the 5th harmonic as an example;
From the above chart, it can be seen that the total harmonic content before compensation was 28.9%, and after compensation, it was reduced to 6.4%.
The current distortion rate of the power grid has significantly decreased, and the current waveform is much closer to the ideal sine wave compared to before compensation. At the same time, the investment in the active power filter also allows the reactive power compensation cabinet to operate normally.
Schematic Diagram of Filter Installation Location:
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