• GANDRAPU NAVYA
• A. Padmaja

Power electronic devices like inverters are employed as the interfaces to improve the controllability of DGs and ensure the power quality. The increasing penetration of Inverter-Interfaced Distributed Generators (IIDGs) has significantly challenged the distribution network in terms of intermittent power generation, bidirectional power flow, limited overcurrent capacity, etc. control schemes adopted by IIDGs in a microgrid that leads to the complexity on fault estimation. The system under study in a microgrid consists of two DGs. The step-up transformer is used to connect a microgrid to the utility grid. When circuit breaker is open the microgrid will operate in islanded mode operation. PQ-IIDG and V/f IIDG controllers will be used in the system to control current, voltage and frequency of the system. PQ controlled IIDGs deliver preset power to the utility grid. V/f-IIDG is a group of controlled voltage sources, which can handle different types of faults flexibly while achieving current limiting. This paper can be extended by using Fuzzy controller which controls current, voltage and power so that the negative sequence signals are filtered out and only positive sequence signals are delivered into control systems. Fuzzy control strategy is widely used in a microgrid for its advantages of fuzzy logic controller, is that, it generally has a nonlinear transfer function, simple, robust solutions that convert a wide range of system parameters and can cope up with major disturbances.

"Fault Analysis of Inverter-Interfaced Distributed Generators within a Low-Voltage Micro grid Using Different Control Schemes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.174-187, June 2019, Available :http://www.jetir.org/papers/JETIR1907Q72.pdf

"Fault Analysis of Inverter-Interfaced Distributed Generators within a Low-Voltage Micro grid Using Different Control Schemes", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp174-187, June 2019, Available at : http://www.jetir.org/papers/JETIR1907Q72.pdf