Abstract:

To address the issues of complex operation, high inrush current, and power interruption in the grid integration of traditional low-voltage generator vehicles, a non-intrusive flexible grid-connection and uninterrupted operation technology based on diesel-storage coordination is proposed. This technology acquires grid and generator status via non-intrusive sampling, and integrates proportional-integral-derivative(PID) dynamic adjustment of diesel generators with a circuit breaker closing time prediction algorithm to achieve precise flexible control of voltage, frequency, and phase. Meanwhile, it introduces an energy storage system based on virtual synchronous generator(VSG) control for rapid response to frequency and voltage fluctuations, suppressing load impacts. Engineering validation shows that this technology reduces on-site operation time by over 66%, achieves power-outage-free switching, completely eliminates “two brief power interruptions”, and significantly enhances safety and reliability, making it suitable for distribution network planned maintenance and emergency power supply scenarios.

Key words: diesel-storage coordination, flexible grid-connection, non-intrusive, uninterrupted operation