High-end manufacturing

Features: With the development of modern industrial technology, the application of power electronics in power systems has become increasingly widespread. The widespread use of various nonlinear electronic devices, such as inverters, rectifiers, and various switching power supplies, has improved modern industrial automation technology but also generated significant harmonic interference to the power grid. Inverters are particularly widely used across various manufacturing industries. Compared with traditional DC speed control, inverters can achieve stepless speed regulation for AC motors, meeting the speed control requirements of production processes, thereby improving product output and quality, significantly saving energy, and reducing production costs. However, both DC and AC speed control technologies utilize rectifier circuits in their electrical design, which introduces significant harmonic pollution to the system. Occasional power outages (swings) caused by external grid fluctuations are a persistent problem, significantly negatively impacting high-end manufacturing.

Project Background: A textile processing and manufacturing plant has two main sources of harmonics: the inverter loads driving air conditioners and fans, which improve energy efficiency but also cause significant harmonic pollution; and the intelligent controllers and PLC systems in the automated production line also generate significant harmonics. Flashbacks (power fluctuations) caused by external grid fluctuations are becoming increasingly common, seriously impacting high-quality production.

Solution: Two units of the new Kedelibang power supply equipment were installed in the power supply circuit, and a total of three units were installed in different circuits supplying the production line to perform harmonic control, eliminate electrical pollution, and completely resolve the external grid flashback problem. Taking the flashback harmonic control of the power supply to the wind turbine room as an example, the harmonic content was significantly reduced, fully complying with national standards. The current distortion rate dropped from 29.3% to 4.2%. This effectively eliminated the harmonic pollution generated by the wind turbines, purified the factory's power system, and provided pure and reliable power for precision testing instruments.

Conclusion: The installation of the new Kedelibang power supply equipment reduced line and transformer losses, extended equipment life, and reduced transformer investment during capacity expansion. This was primarily due to the reduced capacity squeeze caused by harmonic currents. Furthermore, the new Kedelibang power supply equipment simultaneously provides harmonic control, reactive power compensation, voltage and current stabilization, three-phase balancing, and flashback elimination, truly achieving both power quality and energy conservation.