Baku, Azerbaijan| 155 INTERNATIONAL JOURNAL of ACADEMIC RESEARCH Vol. 6. No. 3. May, 2014 M. Shirvani, M. Abdollahi, Ali A. Dusti, I. Baghbani. effects of wind parks on the power system performance and operation: case study at a single machine power system. International Journal of Academic Research Part A; 2014; 6(3), 155-160. DOI: 10.7813/2075-4124.2014/6-3/A.21 Library of Congress Classification: TK1-9971, TJ163.13-163.25 EFFECTS OF WIND PARKS ON THE POWER SYSTEM PERFORMANCE AND OPERATION: CASE STUDY AT A SINGLE MACHINE POWER SYSTEM Mojtaba Shirvani, Mostafa Abdollahi, Ali Akbar Dusti, Iman Baghbani Department of Electrical Engineering, College of Engineering, Boroujen Branch, Islamic Azad University, Boroujen (IRAN) E-mails: m.shirvani@iauboroujen.ac.ir, m.abdollahi@iauboroujen.ac.ir, a.dusti@iauboroujen.ac.ir, I.baghbani@iauboroujen.ac.ir DOI: 10.7813/2075-4124.2014/6-3/A.21 Received: 21 Jan, 2014 Accepted: 18 May, 2014 ABSTRACT Wind parks have a significant effect on the power system performance and operation. The output power of wind parks is fluctuant and therefore these oscillations are injected into the power system. The proposed oscillations lead to fluctuations at voltages, powers and the other parameters. It is valuable to study the wind parks performance and analyzing its effects on the power system. This paper investigates the effects of wind parks at a single-machine power system. The simulation results demonstrate the effects of wind parks on the system performance. Key words: Wind Parks, Wind Farms, Single Machine Power System, Fluctuations 1. INTRODUCTION Wind parks or wind farms have been widely investigated in electric power systems [1-5]. In paper [6] models of Wind Parks (WPs) appropriate for simulation purposes of large power systems with high wind power penetration are developed. The proposed models of the WPs are developed using system identification theory. Data obtained from the simulation of detailed WP models are used for system identification. The obtained models are general and they can be applied to different configurations of WPs as only system's input/output data are used and not any internal states of the model. Simulation results confirm the accuracy and the advantages of the proposed WP equivalent models. Paper [7] investigates the effects of introducing a WP-PSS (Wind Powered Pumped Storage System) in isolated electricity systems assuming unfavorable conditions such as low onshore wind potential and low PSS head height. These disadvantages can be compensated with the installation of offshore wind parks, larger reservoirs and double penstocks to allow simultaneous water fall and pumping using pipes of the greatest diameter that are currently commercially available. With the above modifications, the energy efficiency of the WP-PSS improves while the installation costs rise. Paper [8] focuses not only on the review of the requirements set by Grid Codes, but also on control methods of wind turbines for their participation in primary frequency control and synthetic inertia. This paper discusses that active power reserves are needed for the proper operation of an electrical system. These reserves are continuously regulated in order to match the generation and consumption in the system and thus, to maintain a constant electrical frequency. They are usually provided by synchronized conventional generating units such as hydraulic or thermal power plants. With the progressive displacement of these generating plants by non-synchronized renewable-based power plants (e.g. wind and solar) the net level of synchronous power reserves in the system becomes reduced. Therefore, wind power plants are required, according to some European Grid Codes, to also provide power reserves like conventional generating units do. Paper [9] studies the impact of hybrid wind and hydroelectric power generation on the operational performance of isolated power systems. This paper describes that in recent years, electric power systems are adopting new technologies in their structure in order to achieve better performance and efficiency in the electricity production, transmission and distribution. This fact together with additional financial incentives being developed in many countries have increased considerably the number of power generating units using renewable energy sources. However, a major drawback of these units is their dependency on unexpected weather conditions such as the wind speed and the rainfalls in the respective hydrologic areas. The purpose of this paper is to investigate the impact of wind parks and hydroelectric power plants on the reliability and operational performance of isolated power systems. A probabilistic methodology has been developed for simulating more efficiently and realistically the reliability and operational performance of these power systems. This is an effective computational methodology that is based on the Monte-Carlo sequential simulation approach and it evaluates the