Key factors influencing voltage recovery of DG units in distribution system

Along with a number of benefits, large penetration of distributed generation (DG) units in the distribution system imposes some serious challenges for power engineers. Slow voltage recovery under post-fault condition turns up as one of the most critical problems in small DG integration. Majority of the small DG units trip due to lack of fault ride-through (FRT) capability, and hence, challenges the overall system stability. This paper investigates and summarises the factors, which govern the voltage recovery process in transient condition. A 16-bus commercial system has been utilized as the test system to perform the simulations. Impacts of faults along with various aspects of generator, load and network parameters have been thoroughly examined through time domain simulations. A careful analysis of the presented results can be useful to develop corrective methodologies for prompt voltage recovery, and thus, ensure widespread integration of DG units.