Comparative study on the performance of control systems for doubly fed induction generator (DFIG) wind turbines operating with power regulation |
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Authors: | L.M. Fernandez C.A. Garcia F. Jurado |
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Affiliation: | 1. Department of Electrical Engineering, University of Cádiz, 11202 EPS Algeciras (Cádiz), Spain;2. Department of Electrical Engineering, University of Jaén, 23700 EPS Linares (Jaén), Spain |
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Abstract: | As a result of the increasing wind power penetration on power systems, the wind farms are today required to participate actively in grid operation by an appropriate generation control. This paper presents a comparative study on the performance of three control strategies for DFIG wind turbines. The study focuses on the regulation of the active and reactive power to a set point ordered by the wind farm control system. Two of them (control systems 1 and 2) are based on existing strategies, whereas the third control system (control system 3) presents a novel control strategy, which is actually a variation of the control system 2. The control strategies are evaluated through simulations of DFIG wind turbines, under normal operating conditions, integrated in a wind farm with centralized control system controlling the wind farm generation at the connection point and computing the power reference for each wind turbine according to a proportional distribution of the available power. The three control systems present similar performance when they operate with power optimization and power limitation strategies. However, the control system 3 with down power regulation presents a better response with respect to the reactive power production, achieving a higher available reactive power as compared with the other two. This is a very important aspect to maintain an appropriate voltage control at the wind farm bus. |
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Keywords: | DFIG Wind farm generation control Wind power production Wind turbine control system |
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