一种用于变频器的过压保护方法及系统
By constructing a multi-dimensional state monitoring system and a dynamic capacitor stress index for the frequency converter, the problem of lag in overvoltage protection response in existing technologies is solved, achieving smooth energy discharge and safety protection for the frequency converter, and avoiding damage to mechanical loads.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- QINGDAO HIWITS METER
- Filing Date
- 2026-05-15
- Publication Date
- 2026-07-17
AI Technical Summary
Existing inverter overvoltage protection technology relies on a single static voltage threshold for judgment, which leads to response lag and mechanical load damage. It cannot effectively assess the status of energy feedback sources and poses risks of protection lag and secondary disasters.
By acquiring the DC bus voltage, motor stator current, and frequency during inverter operation, a transient energy feedback gradient and dynamic capacitor stress index are constructed. The chopper duty cycle of the braking unit is calculated using the overflow ratio of the dynamic capacitor stress index, thereby achieving flexible discharge of excess energy and avoiding mechanical load damage caused by emergency stops.
It eliminates the sensing blind spot and response lag of single static voltage monitoring, realizes smooth safety protection before irreversible breakdown, and avoids rigid fracture damage of high-speed heavy-duty mechanical components.
Smart Images
Figure CN122203178B_ABST