International Journal of Industrial Electronics, Control and Optimization .© 2020 IECO…. Vol. 3, No. 1, pp. 69-80, Jan (2020) Effect of Different Representations of Wind Turbines on the SSR Analysis in the Double Cage Induction Generator Based Wind Farm Mohammad Kazem Salehi1 1 and Roohalamin Zeinali Davarani 2,† 1,2 Department of Electrical Engineering, Faculty of Electrical and Computer Engineering, Graduate University of Advanced Technology, Kerman, Iran In this paper different representations of a wind farm based on double-cage induction generators connected to a series-compensated line is studied and their effect on the Subsynchronous Resonance (SSR) is analyzed. For this purpose, three representation types of wind turbines in SSR studies of the wind farm are considered as 1) Single Turbine Representation (STR), 2) Multiple Turbine Representation (MTR), and 3) Full Turbine Representation (FTR). To select the acceptable representation of the wind farm in SSR analysis, the wind farm is modeled by three representation and the test system eigenvalues are obtained for different conditions of the power system and the results are compared together. For this purpose, three scenarios are considered. In the first and second scenarios, all of the Wind Turbine Generators (WTGs) have identical electrical and mechanical parameters but WTGs in the third scenario are different. In the first scenario, all wind turbines are subjected to the same wind speed, and in the second and third scenarios, each group of wind turbines is subjected to the same wind speed. In addition, the analytical results are validated by electromagnetic transient simulation using PSCAD/EMTDC software. Article Info Keywords: Double cage induction generator, Sub-synchronous resonance, Wind power plant, Wind turbine representation Article History: Received 2018-12-02 Accepted 2019-05-17 I. INTRODUCTION Worldwide, the installed capacity of wind power plants is increasing rapidly. Technological advancements, design improvements, and costs reduction have played a significant role in increasing wind farms penetration levels in power system [1]. Many countries are going to generate 20% of their energy from renewable energy sources until 2020, which wind energy is recognized as the prime renewable source [2], [3]. The large power plants connecting to transmission and distribution networks have several basic problems [4-7]. Large wind farms are typically located in remote areas with a good wind pattern, which causes the construction of long transmission line and consequently reduces transmission power [8], [9]. Different methods have been proposed to overcome this problem. One of these ways is the need for installing the new transmission lines, which isn’t generally economic. Using the series compensation based series capacitors is another method, which enhances the power transfer capability with the existing transmission lines. Hence, it is being increasingly considered for large wind power plants [10-13]. Furthermore, using the series capacitors in the power network lines near to wind plants may also potentially cause SSR in the wind turbine induction generators [14]. In order to model the wind farm to study the dynamic behavior of the power system, a large number of papers have used the aggregated equivalent model [5], [11], [15], [16]. However, modeling the large number of Induction Generators (IGs) in a wind farm by a single equivalent IG may not be accurate, but papers that have analyzed the SSR † Corresponding Author: r.zeinali@kgut.ac.ir Tel: +98-3431623445, Fax: +98-3431623445 Faculty of Electrical and Computer Engineering, Graduate University of Advanced Technology, Kerman, Iran A B S T R A C T