ESS equipped DFIG wind farm with coordinated power control under grid fault conditions
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ORIGINAL ARTICLE
ESS equipped DFIG wind farm with coordinated power control under grid fault conditions Farshid Najaty Mazgar1 · Mehrdad Tarafdar Hagh1,2 · Sajjad Tohidi1 Received: 10 May 2020 / Revised: 22 October 2020 / Accepted: 26 October 2020 © The Korean Institute of Power Electronics 2020
Abstract A new structure for doubly fed induction generator (DFIG) wind farms with coordinated power control under grid fault conditions are proposed in this paper. The proposed structure uses one grid side converter (GSC) and one energy storage system (ESS) for the entire wind farm unlike conventional structures, which have one GSC for each of the DFIGs. A converter loss decrease and a reliability enhancement are some of the advantages of the proposed wind farm, under normal operating conditions. The proposed wind farm follows the new grid codes to remain connected to the grid. In addition, it supports the network voltage and frequency stability by generating reactive and active power during and after faults. The ESS is coordinated with the wind farm to generate smooth active power under normal operation. This improves the low voltage ride-through capability of the wind farm under-voltage fault conditions and enhances the frequency response of the wind farm under frequency faults. MATLAB/Simulink software was used to simulate the proposed wind farm structure. An experimental setup was also provided to test the operation of the proposed power circuit topology. Keywords DFIG · Power management · LVRT · Frequency support
1 Introduction Nowadays, the penetration of wind turbines in power systems is increasing rapidly due to their economic advantages and high reliability. Among wind turbines, doubly fed induction generators (DFIGs) enjoy a number of advantages including their operation at a wide range of wind speeds, and their use of power converters that are fractionally rated, which ultimately results in a reduction in the construction costs. However, due to the high penetration of such power generators, they should have proper frequency support (FS) and frequency regulation capability. The federal energy regulatory commission released order No. 819 to revise regulations to foster competition in the sale of primary frequency response services to encourage the use of generators to participate in grid frequency support [1]. Additionally, various grid codes have been defined for the connection of * Mehrdad Tarafdar Hagh [email protected] 1
Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran
Faculty of Engineering, Near East University, Nicosia, North Cyprus, Turkey
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power generators. Significantly, all of the generators connected to a grid should have a low voltage ride through (LVRT) capability. These codes suggest that the wind turbines should be able to bear a certain amount of voltage dip in their terminals for a certain amount of time without getting disconnected from the grid. In addition, these generators are required to inject reactive power to the grid depending on th
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