Impact of Distributed Generation on Protection of Power System Digambar R. Bhise Ravishankar S.Kankale Saurabh Jadhao Department of Electrical Engineering, Assistant Professor Assistant Professor SSGMCE, Shegaon Department of Electrical Engineering, Department of Electrical Engineering, digambar8021@gmail.com SSGMCE, Shegaon SSGMCE, Shegaon ravi_kankale@rediffmail.com ssjadhao@gmail.com Abstract- Day by day demand of Electricity is increasing so, in order to fulfill this demand we need to increase generation of power. Because of this increasing demand, non- renewable energy sources are on the verge of extinction so the solution is to use renewable energy sources. One such solution is to connect DG having renewable energy sources in power system. But the insertion of DG has some impact on a power system. This paper deals with the evaluation of the impact of DG on the protection of power system. The work presented in this paper consists of a simulation of a radial power system in PS CAD /EMTDC software. Monitoring of both fault current and the load current is done in the simulation. The impact of DG on fault current under the influence of LG, LL and LLLG fault with and without protection is studied. Maximum magnitude of fault current is found in case of LLLG fault. Also, the impact of resistive fault current limiter on the magnitude of fault current is studied. Both DG and source is protected from fault current by using overcorrect protection with pick up value of 2kA and 4kA respectively. Keywords — Distributed generation, renewable energy, Overcurrent Protection. I. Introduction The performance of distribution system is affected by distributed generation in various ways. As DG is related to renewable energy for lowering the environmental impact of power generation indicate a large scope for DG in future. DG improves voltage Profile but interfere with voltage regulation [1],[2]. The losses in a circuit can be minimized if DG is connected near to the load. The existing system did not deal with generation at distribution substation on radial feeder so such system where not designed to handle such power would be sent back to the source. Hence, accountable effect on the operation of existing protection may occur both false tripping and non-operations of protective devices are possible [3]. Selecting DG such a like that system operation will give a correct working after connecting DG in a network. Inserting DG will have an effect on the short circuit level, Transient stability of system, voltage and power quality. This paper gives an idea about the impact of DG on short circuit and load flow behavior are taken as a main disturbing parameter for effective protection. DG provides an additional fault current in the system. Fault current value depends on the parameter such as size, type, and location of DG. These additional fault current affect the performance of the system protection. II. Distributed generation Distributed Generation [5] (DG) is one of the new technology that gives a focused for the last few years and day by day its use in distribution networks is increasing. It is presented in many forms such as solar (PV), wind (wind farms) with small scale ratings up to 10MW. It is referred to generate electricity and supplying this electricity to customers with their locations, it can also be interconnected to the utility grids. There are so many exemptions of a DG gives to the customer, this privileges various types of advantages to install a DG rather than constructing new distribution lines. This DG can be used to provide electric supply to customers during peak load hours, it can satisfy a consumer demand apart from the grid, thus it can also support to an intentional islanding. One of the major problems that have to be considered to achieve a safe and effectively use of DG is its interconnection to the utility grid. III. Types of Distributed Generation DG can be classified into two major parts such as inverter based DG and rotating machine DG. After the generation process inverters are usually used in DG systems, as the generated voltage may be in DC form or AC. It has to be converted first to DC then back to AC so it is required to be changed to the nominal voltage and frequency with the nominal parameters through the rectifier. A. Photo voltaic PV system is an eco-friendly system as it has no issue what so ever. These PV systems have being used the sun as its fuel source to generate DC voltage with a range of few megawatts and then transferred to AC with the help of inverters . International Conference on Innovative Mechanisms for Industry Applications (ICIMIA 2017) 978-1-5090-5960-7/17/$31.00 ©2017 IEEE 399