SVG Parallel Operation Test via CAN Communication

SVG Parallel Operation Test via CAN Communication

Test Objective

This test aimed to verify the performance and stability of multiple SVG (Static Var Generator) units operating in parallel via CAN communication when internal CTs are not used. Specifically, eight SVG modules were tested to evaluate their operation, communication reliability, and reactive power compensation consistency under CAN-based synchronization.

Test Setup

• Standard: DLT1216-2019 Technical Specification for Low-Voltage Static Var Generators

• External CT: Installed on the power supply side, ratio 250:5
  

• Internal CT: Communicated via CAN bus
  
  

• Oscilloscope Signals:

  • Yellow: Harmonic load current
    
    

  • Green: Total output current of all modules
    
    

The CAN communication utilized IDs 10000001 to 10000008, covering all eight units, with a baud rate of 500 kbps.

Test Process and Observations

1. Reactive Current Response

The system was tested with reactive current varying from 0 A to +150 A. All modules demonstrated smooth and synchronized compensation transitions, maintaining stable operation without current oscillation or communication delay.






The system was tested with reactive current varying from 0 A to -150A.

2. Load Sharing Performance

The total single-phase load current was 150 A. The theoretical output per SVG was 18.75 A per phase.
The measured data are as follows:

The current-sharing performance between the modules remained consistent, with deviations within acceptable tolerance limits, confirming effective load balancing across the parallel SVG network.

Conclusion

The SVG system demonstrated reliable parallel operation through CAN communication, achieving accurate reactive current control and balanced current sharing among modules.

This result validates that CAN-based coordination can effectively replace internal CT synchronization for multi-unit SVG setups, offering flexibility, scalability, and reduced wiring complexity in practical engineering applications.

For more information, please contact engineer David on WhatsApp at+86 18917353780