analysis of wind generator operations under unbalanced voltage dips in the light of the spanish grid code分析风力发电机操作下西班牙电网不平衡电压跌落的代码.pdfVIP

Energies 2011, 4, 1148-1162; doi:10.3390/en4081148 OPEN ACCESS energies ISSN 1996-1073 /journal/energies Article Analysis of Wind Generator Operations under Unbalanced Voltage Dips in the Light of the Spanish Grid Code Vicente León-Martínez and Joaquín Montañana-Romeu * Electrical Engineering Department, Universidad Politécnica de Valencia / Camino de Vera, 14. 46022-Valencia, Spain; E-Mail: vleon@die.upv.es * Author to whom correspondence should be addressed; E-Mail: jmontanana@die.upv.es; Tel.: +34-963-879-594; Fax: +34-963-877-599. Received: 29 June 2011; in revised form: 20 July 2011 / Accepted: 22 July 2011 / Published: 8 August 2011 Abstract: Operation of doubly fed induction generators subjected to transient unbalanced voltage dips is analyzed in this article to verify the fulfillment of the Spanish grid code. Akagi’s p-q theory is not used for this study, because control of the electronic converter is not the main goal of the paper, but rather to know the physical phenomena involved in the wind turbine when voltage dips occur. Hence, the magnetizing reactive power of the induction generators and their components, which are related with the magnetic fields and determine operation of these machines, are expressed through the reactive power formulations established in the technical literature by three well-known approaches: the delayed voltage (DV) method, Czarnecki’s Current’s Physical Components (CPC) theory and E