International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 12, No. 2, Jun 2021, pp. 1006~1014 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v12.i2.pp1006-1014  1006 Journal homepage: http://ijpeds.iaescore.com Load flow analysis of 10 bus loop distribution network excited by a generator simulated using open modelica editor P. Abirami 1 , C. N. Ravi 2 1 EEE, Sathyabama Institute of Science and Technology, Chennai, India 2 EEE Vidya Joythi Institute of Technology, Hyderabad, india Article Info ABSTRACT Article history: Received Oct 9, 2020 Revised Mar 17, 2021 Accepted Mar 28, 2021 In recent days, due to advancement in technology, the end users are facing severe power quality issues. Load flow analysis is one of the fundamental methodologies in solving power network problems. The key importance of load flow analysis is to improve the performance of distribution network. The main intention of this reserach is to carry out the load flow and voltage stability analysis of 10 bus loop distribution network energized by a generator. Load flow analysis is carried out by using Newton Raphson method. The per unit voltage and angle of the proposed network is determined in all 10 buses by load flow analysis. The voltage stability analysis is implemented by introducing a fault in the network. Here, a power fault is injected at bus 4 between the time interval of 2 to 3 sec to analyse the stability of the system. The voltage stability of the system is analysed for the network with and without automatic voltage regulator (AVR). The AVR unit is tuned by using power system stabilizer (PSS). The results are examined by simulating the network using openmodelica connection editor. From the simulation results the per unit voltages and angles at all 10 buses are determined for the network with and without AVR. By comparing both the results it is proved that the network with AVR has better voltage stability than the other. Thus, the voltage stability of the system is improved by connecting the generator with AVR and PSS. Keywords: Automatic voltage regulator IPSL Load flow analysis Power system stabilizer This is an open access article under the CC BY-SA license. Corresponding Author: P. Abirami EEE, Sathyabama Institute of Science and Technology, Chennai, India Email: abiramiramkumar80@gmail.com 1. INTRODUCTION In this modern civilization, the electrical utilities need to be automated to fulfill the requirements of human activities. For automation various control processes are implemented to control the utilities. These processes may be of linear or non-linear in nature which results in reducing the quality of power. In current situation the demand for electricity increases like the increase in demand for gold in our country. So, we should ensure that all the end users are supplied with quality power [1]-[3]. One can be confident about the power quality when there is enough knowledge about stability of voltages, different bus angles and power flows in a network. Hence, it is necessary to analyze power or load flow studies of network (either transmission or distribution) to enhance its efficiency and quality [4]-[6]. Depends on the power flow studies the following buses are framed, a) slack or reference bus, b) generator bus, and c) load bus Here, the slack bus is provided with both voltage magnitude and angle. So, it is also called as reference bus in the network. The generator bus is called as PV bus because the real power and voltage magnitude are specified for it [7], [8]. The load buses they are generally known as PQ buses [9], [10]. The per unit magnitude and phase angle of voltage for load buses are determined by using numerical methods