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Energies 2013, 6(9), 4660-4681; doi:10.3390/en6094660
Article

Coordinated Control of a Doubly-Fed Induction Generator-Based Wind Farm and a Static Synchronous Compensator for Low Voltage Ride-through Grid Code Compliance during Asymmetrical Grid Faults

* ,
 and
Tsinghua National Laboratory for Information Science and Technology, Department of Automation, Tsinghua University, Beijing 100084, China
* Author to whom correspondence should be addressed.
Received: 19 July 2013 / Revised: 23 August 2013 / Accepted: 26 August 2013 / Published: 9 September 2013
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Abstract

This paper aims to explore a viable solution for a doubly-fed induction generator (DFIG)-based wind farm to meet the reactive support requirement of the low voltage ride-through (LVRT) grid code with safe grid-connected operation during asymmetrical grid faults. First, the control scheme for the DFIG-based wind energy conversion system (WECS) is designed. Then, the controllability issue is analyzed by means of an optimal method, and the derived controllable regions indicate that the DFIG-based WECS can only remain controllable under mild asymmetrical fault situations. Afterwards, the static synchronous compensator (STATCOM) is introduced as extra equipment to ensure that the DFIG-based wind farm remains controllable under severe asymmetrical fault situations. For this purpose, a voltage compensation control scheme and a corresponding capacity matching method for the STATCOM are proposed. The simulation results verify that, with the proposed coordinated control between the DFIG-based wind farm and the STATCOM, the required positive-sequence reactive current can be supplied to support the power grid. The oscillations on the electromagnetic torque and direct current (DC)-link voltage of the DFIG-based WECS can also be eliminated. Therefore, the control scheme can be helpful to improve the reliability of both the wind farm and the power system during grid faults.
Keywords: wind energy conversion system; doubly-fed induction generator; asymmetrical grid faults; low voltage ride-through; limit analysis; static synchronous compensator; capacity matching wind energy conversion system; doubly-fed induction generator; asymmetrical grid faults; low voltage ride-through; limit analysis; static synchronous compensator; capacity matching
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Zheng, Z.; Yang, G.; Geng, H. Coordinated Control of a Doubly-Fed Induction Generator-Based Wind Farm and a Static Synchronous Compensator for Low Voltage Ride-through Grid Code Compliance during Asymmetrical Grid Faults. Energies 2013, 6, 4660-4681.

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