The main purpose of developing microgrids (MGs) is to facilitate the integration of renewable energy sources (RESs) into the power grid. RESs are normally connected to the grid via power electronic inverters. As various types of RESs are increasingly being connected to the electrical power grid, power systems of the near future will have more inverter-based generators (IBGs) instead of synchronous machines. Since IBGs have significant differences in their characteristics compared to synchronous generators (SGs), particularly concerning their inertia and capability to provide reactive power, their impacts on the system dynamics are different compared to SGs. In particular, system stability analysis will require new approaches. As such, research is currently being conducted on the stability of power systems with the inclusion of IBGs. This review article is intended to be a preface to the Special Issue on Voltage Stability of Microgrids in Power Systems. It presents a comprehensive review of the literature on voltage stability of power systems with a relatively high percentage of IBGs in the generation mix of the system. As the research is developing rapidly in this field, it is understood that by the time that this article is published, and further in the future, there will be many more new developments in this area. Certainly, other articles in this special issue will highlight some other important aspects of the voltage stability of microgrids.
The study explores growing trends of using mobile in English language learning among higher secondary school learners in Pakistan. A survey is conducted to collect data from randomly selected students in district Okara (Punjab), Pakistan. Questionnaire based on five likert scale used to collect quantitative data. Analysis done on SPSS, to acquire mean score and frequency analysis reveals that higher secondary school students of English have great tendency for using mobile to learn English. Besides Students’ perception as obtained from survey prove that using mobile for English language learning makes their job easy and they are able to develop their listening and communicative habits. Findings of this study also reveal that using mobile for English language learning makes the students, independent and self-evaluator.
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