부산대학교 도서관

The amount of ancillary services provided in the low voltage (LV) grids increased in the past. Active power reduction due to over frequency and the allocation of reactive power are the most common ones including loss of mains detection. In the future, additional requirements will be necessary for generators connected to LV grids: fault-ride-through capability (FRT). But this contradicts the terms of loss of mains or anti-islanding-detection (AID). AID uses the event of voltage drops to trip the inverter and thus shuts down islands. Hence there is a potential danger that stabilizing the grid with FRT causes the AID to become ineffective. In this paper, a detailed analysis is made on that challenge. A possible solution is presented that enables a conjoint implementation of both FRT and AID. Its advantages and drawbacks are discussed in detail. For validation purposes, a model for a three phase inverter is developed which includes the proposed algorithm. It is successfully tested in simulation.