202 | PART A. APPLIED AND NATURAL SCIENCES www.ijar.eu INTERNATIONAL JOURNAL of ACADEMIC RESEARCH Vol. 6. No. 3. May, 2014 M. Shirvani, M. Abdollahi, Ali A. Dusti, I. Baghbani. Wind parks fluctuations at multi machine environment. International Journal of Academic Research Part A; 2014; 6(3), 202-207. DOI: 10.7813/2075-4124.2014/6-3/A.28 Library of Congress Classification: TK1-9971, TJ163.13-163.25 WIND PARKS FLUCTUATIONS AT MULTI MACHINE ENVIRONMENT 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@iau.ac.ir, a.dusti@iauboroujen.ac.ir, I.baghbani@iauboroujen.ac.ir DOI: 10.7813/2075-4124.2014/6-3/A.28 Received: 10 Jan, 2014 Accepted: 22 May, 2014 ABSTRACT Multi machine electric power systems are recently installed with offshore and onshore wind parks. The wind parks may have hundreds wind turbine and produce a significant power in the network. The output of wind parks is fluctuant and it is required to study these fluctuations on the system performance. In this paper, a multi- machine power system is installed with wind park and analyzed. The simulation results show the effects of wind farms fluctuations on the system parameters such as voltages, powers, and so forth. Key words: Multi Machine Electric Power Systems, Offshore Wind Parks, Onshore Wind Parks, Wind Park Fluctuations 1. INTRODUCTION Wind farms have been widely considered in power system planning [1, 2], load flow analysis [3], reliability assessment [4, 5], HVDC application [6], OPF studies [7] and etc. Many studies have been carried out in this field, and this shows the importance of such a new energy. Paper [8] addresses the small signal stability analysis of power systems with DFIG based wind power penetration. This paper describes that with the increasing penetration of wind power generation into the power system, it is required to comprehensively analyze its impact on power system stability. The present paper analyzes the impact of wind power penetration by doubly fed induction generator (DFIG) on power system oscillations for two-area interconnected power system. The aspects of inter-area oscillations which may affect the operation and behaviour of the power systems are analyzed with and without the wind power penetration. Eigenvalue analysis is carried out to investigate the small signal behaviour of the test system and the participation factors have been determined to identify the participation of the states in the variation of different mode shapes. The penetration of DFIG in a test system results in an oscillatory instability, which can be stabilized with the coordinated operation of automatic voltage regulator (AVR) and power system stabilizer (PSS) equipped on synchronous generators. Also, the variations in oscillatory modes are presented to observe the damping performance of the test system at different wind power penetration level. Paper [9] provides a survey on energy storage resources configurations in order to propose an optimum configuration for smoothing fluctuations of future large wind power plants. This paper explains that as the wind power capacity increases, the effect of wind power fluctuations on the system stability becomes more significant. Despite its high costs, utilizing energy storage resources such as batteries is inevitable in the smoothing process of wind power fluctuations. In a wind power plant, the place where batteries are located has considerable direct effect on their required capacity and thus on the initial investment cost. Therefore, in this paper a suitable configuration which significantly reduces the batteries investment cost is proposed and then the wind power fluctuation of a large wind power plant connected to a smart distribution grid is smoothed. Additionally, existing configurations for installing batteries in large wind power plants are investigated. The proposed configuration utilizes smart parks as aggregated storage resources in load side and an aggregated battery energy storage system with limited capacity in plant side as well. Therefore, in addition to accurate smoothing of wind power fluctuations, the energy storage investment cost is reduced significantly utilizing the proposed configuration. Simulation studies in MATLAB software package are carried out to verify the performance of the proposed approach. Paper [10] provides Planning 10 onshore wind farms with corresponding interconnection network and power system analysis for low- carbon-island development on Penghu Island, Taiwan. This paper describes that a five-year, NT$8.09 billion project to turn Penghu, Taiwan, into a world-class low-carbon island was formally launched in 2011. The project is a major milestone in Taiwan’s development of renewable energy. The initiative, which will install large onshore wind power generators, is predicted to reduce carbon dioxide emissions by more than 50% in 2015 from 2005 levels. The study examines the plan for large onshore wind farms and the corresponding connected network, and