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Abstract-Improving the fault ride-through (FRT) capability of doubly fed induction generators (DFIGs) in wind power applications is a very important challenge for the wind power industry. The mathematical models of such generators enable us to analyze their response under generic conditions. However, their mathematical complexity does not contribute to simplifying the analysis of the system under transient conditions and hence does not help in finding straightforward solutions for enhancing their FRT. This paper presents a simplified model of the DFIG, which has been extracted from the classical fifth-order model, which can accurately estimate the behavior of the system while significantly reducing its complexity. In this paper, the mathematical deduction of this model will be presented, and simulations and experimental results will be shown to demonstrate the accuracy and reliability of the proposed algorithm.

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The decision-making process regarding cash allocation, especially in times of recession, is somewhat challenging. Thus, the aim of this study is to evaluate the effects of the financial crisis in cash holdings of privately-held firms in the Brazilian sugarcane industry. For this purpose, a unique, hand-collected panel data of 31 firms for the period from 1998 to 2015 was used. The results show that the private firms of the industry maintain higher levels of cash than the average found by studies with Brazilian public companies. Furthermore, between the two dummy variables used, representing the subprime crisis and the most recent economic crisis in Brazil, only the second one was significant. Finally, in order to overcome the adverse conditions of the current Brazilian economic crisis, it was observed an increase in cash holdings, which, in turn, denotes the relevance of precautionary reasons in the understanding of cash management.

Purpose-This paper aims to analyse the capital structure determining factors of Latin American and US corporations after the crisis of 2008, as a means of comparing theoretical assumptions and empirical results in markets of different efficiency levels. Design/methodology/approach-The study sample comprises 1,091 companies belonging to the six largest economies in Latin America plus the USA, in the years 2009 to 2013. The authors performed a regression with data from a balanced overview, which were obtained by using the criterion of minimum weighted square. Findings-The results demonstrated differences in determining factors of capital structure between companies from Latin America and from the USA. The pecking order theory was mostly observed in Latin American companies and the trade-off theory greater was closely aligned with US firms. Originality/value-This research brings new contributions to the issue, once the differences and determinative of the debt profile in companies from different economic contexts are compared.