Island control method of converter multi-parallel system and converter multi-parallel system
The centralized control of inverters in a multi-machine system ensures synchronized island detection and switching, addressing the issue of inconsistent island detection and meeting grid connection standards by using a 'nemer box' to coordinate all inverters.
Patent Information
- Application Number
- CN202411538275.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2044-10-31
AI Technical Summary
In a multi-machine parallel configuration of inverters, the inconsistent detection of island conditions leads to failure in switching to offline mode, as one inverter may mistake the output voltage of another for grid voltage, preventing the system from correctly isolating from the grid, thus not meeting grid connection standards.
A centralized control method where a 'nemer box' coordinates all inverters by detecting grid signals and sending simultaneous offline control signals to each inverter upon detecting an island condition, ensuring synchronized mode switching.
This method prevents the failure of island detection and ensures that the inverter system can correctly isolate from the grid, meeting grid connection standards by synchronizing the mode switching of all inverters.