ISSN (Online) : 2319 - 8753 ISSN (Print) : 2347 - 6710 International Journal of Innovative Research in Science, Engineering and Technology Volume 3, Special Issue 3, March 2014 2014 International Conference on Innovations in Engineering and Technology (ICIET’14) On 21 st & 22 nd March Organized by K.L.N. College of Engineering, Madurai, Tamil Nadu, India Copyright to IJIRSET www.ijirset.com 529 M.R. Thansekhar and N. Balaji (Eds.): ICIET’14 ABSTRACT— Voltage stability is an important problem in the Emerging world of technologies and development, the main objectives in operating an Electric power system is to maintain a proper voltage level thought a system. The Failure occurred in the system equipment to be damage and blackouts. This paper mainly discusses the nonlinear aspect of power systems, with emphasis on voltage instability. In that scenario modal analysis method make use of the power system Jacobean matrix to determine the eigenvalues necessary for the evaluation of the voltage stability of the power system. The least Eigen values indicate the proximity of the system to voltage instability. The voltage profile and critical loading is found by using continuation power flow method. These methods were implemented on IEEE 14 bus system result of the proposed work held on with the help of MATLAB software. KEYWORDS—Continuation Power Flow, Modal Analysis, Distributed Generation, Voltage Collapse, Power System Analysis. I. INTRODUCTION The important operating tasks of power utilities are keep voltage within the operating limit. In recent year power demand is increase worldwide. A Power system is interconnected in to generating station transmission line and distribution line. The existing power system lines are being more and more pressurized. In that power system distribution networks are usually subjected to voltage instability; sometimes voltage collapses. Voltage collapse has become increasing threat to power system security and reliability. Voltage stability analysis is widely used in the planning and daily operation of the power system and online monitoring of the distribution system. Load flow techniques are widely used for voltage stability analysis [1]. The modal analysis method is best method for voltage stability analysis compare to L-index method [2].Voltage stability analysis is most important factor for highly developed networks. Voltage stability is the ability of power system to maintain steady acceptable voltage at all buses in the system under normal condition [3]. Voltage instability stems from the attempt of load dynamics to restore power consumption beyond the capability of the combined transmission and distribution system[3].Voltage stability problems are easily predict through the steady state analysis and load flow analysis. The voltage stability problems are mainly depends up on reactive power variation. The control of reactive power some distributed technologies are used to generate reactive power and improve voltage stability. The voltage stability problems are mainly occurred at the distribution side of the power system network. In that distribution network is customer side (or) load side of the power system network [4]. The distributed generation is connected at the customer side (or) load side of the power system network. The distributed generation to generate the power from near to the load .In that distributed generation connect to the power system many benefits are there we provide quality of power to the customer ,improve voltage profile, Reduce power loss, improve system reliability and efficiency [5,6]. There are many methods are currently used in the voltage stability analysis, the methods are Modal analysis, Steady state voltage stability index, Newton rap son load Optimal Placement of Distributed Generation for Voltage Stability Improvement and Loss Reduction in Distribution Network S.P.Rajaram #1 , V.Rajasekaran *2 , V.Sivakumar #3 #1 Department of Electrical and Electronics Engineering, K.L.N College of Engineering, Madurai, India. *2Department of Electrical and Electronics Engineering, * PSNA College of Engineering and technology, Dindigul, India. #3 Corresspondingauthor, Department of Electrical and Electronics Engineering, K.L.N College of Engineering, Madurai, India.