8_Smita - et International Journal on Emerging Technologies...

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I. INTRODUCTION In most of cases power plants are nuclear, fossil fuel, or hydro plants. These plants are of hundreds of MW or GW. At the same time the application of renewable sources such as wind or sun is becoming economical and feasible. These installations are placed closed to customers have been called as embedded or distributed generators. In fact, studies have predicted that distributed generation may account for up to 20% of all new generation going online by the year 2010. With so much new distributed generation being installed, it is critical that the power system impacts be assessed accurately so that these DG units can be applied in a manner that avoids causing degradation of power quality, reliability, and control of the utility system. This paper is reviewing technical issues concerning to DG interconnection connected to the distribution side of the network because of their small rating. These installations with power system. II. INTERCONNECTION OF DG While Interconnecting DGs to the utility, many goals need to be set forth. Foremost among them are ( i ) Safety of utility personal working on electrical system ( ii ) Safety of utility customers and general public ( iii ) Protect and minimize possible damage to electrical power system (EPS) and other customer’s property ( iv ) Ensure proper operation to minimize adverse operation conditions on EPS. A. Issues related with interconnection of DG Even though DG is a viable option to meet the power demand of the industry, there are varieties of technical, operational, commercial, and regulatory issues that have to be considered before the DG plants are interconnected with the main grid. Interconnection is basically meant for back wheeling the excess power produced by a DG plant to the grid. The interconnection issues have enough potential to prevent distributed generation projects from being developed. Interconnection issues are broadly classified as : ( i ) Technical issues ( ii ) Operational issues ( iii ) Economical issues The primary focus of this paper is to introduce the main technical issues For example; the reliability of the power system may be degraded if the DR is not properly coordinated with the electric power system protection. The integration of DR could influence the power quality due to poor voltage regulation, voltage flickers and harmonics. These conditions can have a serious impact on the operation and integrity of the electric power system as well as cause damaging conditions to equipment. III. TECHNICAL ISSUES The main technical issues for DG connection relate to reliability and power quality of supply, protection, islanding and stability of the system. A. Reliability and power quality issue The large-scale deployment of distributed energy resources expected deterioration of power quality is expected and on the other hand, an adverse effect on the existing power quality of the distributed energy resources is also found.[1] The definition of power quality given in IEEE Standard 1100 [2] reads :
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8_Smita - et International Journal on Emerging Technologies...

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