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Anshan Zhongyou Tianbao Steel Pipe Co., Ltd.

Time：

2019-01-05

Typical Case of Harmonic Control in Steel Pipe Factory (Anshan Zhongyou Tianbao Steel Pipe Co., Ltd.) Project Background: The main technical parameters of the equipment in the steel pipe factory production workshop are as follows: 1. The power transformers are of the S9 series, with capacities of 1250 kVA and 2000 kVA, primary voltage of 10 kV, and secondary voltage of 0.4 kV. 2. The transformer connection method is Y/Y0. 3. The load of the 1250 kVA transformer consists of two 600 kW medium-frequency heating power supplies, with the main connection using a thyristor three-phase bridge rectifier; fast thyristor single-phase bridge inverter; the energy storage component is a reactor; and the output power frequency is 2.5 kHz. 4. The 200...

Typical Case of Harmonic Control in Steel Pipe Factory (Anshan Zhongyou Tianbao Steel Pipe Co., Ltd.)
Project Background:
The main technical parameters of the equipment in the steel pipe factory production workshop are as follows:
2, The power transformer is of S9 series. The capacities are 1250kVA and 2000kVA, with a primary voltage of 10kV and a secondary voltage of 0.4kV.
3, The transformer connection method is Y/Y0.
4, The load of the 1250kVA transformer is two sets of 600kW medium frequency heating power supplies, with the main connection using thyristor three-phase bridge rectification; fast thyristor single-phase bridge inversion; the energy storage component is a reactor; the output power is 2.5kHZ.
5, The load of the 2000kVA transformer includes AC and DC drive motors, with six DC motors, four at 132kW, two at 75kW, totaling 678kW; 28 AC/DC variable frequency drives, with a total capacity of about 350kW; the rest are ordinary AC motors.
6, The medium frequency power supply operates intermittently, with a frequency of about 30S.
7, The 2000kVA transformer can operate simultaneously as needed.
Due to the medium frequency power supply, DC motors, and a large number of variable frequency drives being the main sources of harmonics, the system is severely distorted, leading to frequent failures of reactive power compensation capacitors and an increase in system failure rates. Therefore, a comprehensive plan for reactive power compensation and harmonic control is proposed.
Control Plan:
Based on the site conditions, our company proposed a hybrid control plan combining active and passive methods. This plan uses our independently developed passive power filter model SPF-300/0.4 and active power filter model SPA3-150/0.4 for reactive power compensation and harmonic control.
Control Effect:
The power quality situation before and after compensation
GoodPower
According to the graphical comparison before and after compensation, the power factor before compensation was about 0.6. After the passive power filter was activated, the power factor increased to over 0.93, meeting customer requirements, and the harmonic content also decreased to about 7%; after the active power filter was activated, the harmonic content dropped to 3.5%~5.6%.

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