A Precision Machinery Factory in Shenyang
Established in August 2009, it mainly engages in the manufacturing of precision ball screws, linear guides, and key components for high-grade CNC machine tools. A large number of non-linear load devices are adopted in the production workshop. During operation, these devices generate a large amount of harmonic currents that are directly injected into the power supply system, leading to distortion of the power supply voltage waveform. Due to the poor power supply quality, the production yield of the manufacturing equipment is adversely affected.
Figure 1: Various Types of Precision Ball Screws
The recommended solution is to install one set of NCSA Active Power Filter and adopt the selective harmonic elimination mode to mitigate the 5th, 7th, 11th, and 13th harmonic currents of the system, which can significantly reduce the distortion degree of the system voltage waveform and improve the production yield of the equipment.
Key Features of NCSA Active Power Filter
- Filters out system harmonics, suitable for various harmonic environments with no overload issues
- Fast dynamic compensation response time ≤ 20 ms
- Multiple harmonic filtering modes and compensation functions available
- Capable of full-load output current
- High-reliability IGBT protection architecture with excellent stability
- Touch-screen graphical human-machine interface for easy operation
Figure 2 Cabinet Diagram of NCSA Active Power Filter
Since the harmonic filters were put into operation on March 3, 2015, they have significantly reduced the content of harmonic currents of all orders in the system and the distortion degree of the system voltage waveform. The power quality measurement data of the system main circuit before and after the improvement are summarized in Table 1.
Table 1: Summary of System Improvement Effects (Before & After)
Figure 3: System Voltage and Current Waveforms (Before Improvement)
Figure 4: System Voltage and Current Waveforms (After Improvement)
Figure 5: Time-Lapse Graph of Total Harmonic Current Distortion Rate (Before & After Improvement)