Dual current control strategy to fulfill LVRT requirements in WECS

作者：Diaz Matias^*; Cardenas Dobson Roberto

来源：COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING, 2014, 33(5): 1665-1677.

DOI：10.1108/COMPEL-09-2013-0305

• Back-to-back converter
• Delay signal cancellation
• Low-voltage ride through
• Wind energy

Purpose - The purpose of this paper is to investigate a control strategy to fulfill low-voltage ride through (LVRT) requirements in wind energy conversion system (WECS). %26lt;br%26gt;Design/methodology/approach - This paper considers an active front-end converter of a grid connectedWECS working under grid fault conditions. Two strategies based on symmetrical components are studied and proposed: the first one considers control only for positive sequence control (PSC); the second one considered a dual controller for positive and negative sequence controller (PNSC). The performance of each strategy is studied on LVRT requirements fulfillment. %26lt;br%26gt;Findings - This paper shows presents a control strategy based on symmetrical component to keep the operation of grid-connected WECS under unsymmetrical grid fault conditions. %26lt;br%26gt;Research limitations/implications - This work is being applied to a 2 kVA laboratory prototype. The lab prototype emulates a grid connected WECS. %26lt;br%26gt;Originality/value - This paper validate the PNSC strategy to LVRT requirements fulfillment by experimental results obtained for a 2 kVA laboratory prototype. PNSC strategy allows constant active power delivery through grid-voltage dips. In addition, the proposed strategy is able to grid-voltage support by injection of reactive power. Additional features are incorporated to PNSC: sequence separation method using delay signal cancellation and grid frequency identification using phase locked loop.

• 出版日期2014