Characterisation of Large Disturbance Rotor Angle and Voltage Stability in Interconnected Power Networks with Distributed Wind Generation

Wind generation in highly interconnected power networks creates local and centralised stability issues based on their proximity to conventional synchronous generators and load centres. This paper examines the large disturbance stability issues (i.e. rotor angle and voltage stability) in power networks with geographically distributed wind resources in the context of a number of dispatch scenarios based on profiles of historical wind generation for a real power network. Stability issues have been analysed using novel stability indices developed from dynamic characteristics of wind generation. The results of this study show that localised stability issues worsen when significant penetration of both conventional and wind generation is present due to their non-complementary characteristics. In contrast, network stability improves when either high penetration of wind and synchronous generation is present in the network. Therefore, network regions can be clustered into two distinct stability groups (i.e. superior stability and inferior stability regions). Network stability improves when a voltage control strategy is implemented at wind farms, however both stability clusters remain unchanged irrespective of change in the control strategy. Moreover, this study has shown that the enhanced fault ride-through (FRT) strategy for wind farms can improve both voltage and rotor angle stability locally, but only a marginal improvement is evident in neighbouring regions.

"Mulheres Novas Com Cabeças Limpas": Pitfalls of the Revolution in Licínio Azevedo's Virgem Margarida

In this article, I focus on Licínio de Azevedo’s 2012 film, Virgem Margarida, in relation to Frelimo’s policy of forced re-education camps and their effects on marginalized women in 1980s Mozambique. I also examine the recent political instability in Mozambique and the gendered legacies of regional sentiments on Mozambican national identity

Possibility and agency in Figured Worlds: Becoming a ‘good doctor’

Context: Figured Worlds is a socio-cultural theory drawing on Vygotskian and Bakhtinian traditions, which has been applied in research into the development of identities of both learners and teachers in the wider education literature. It is now being adopted in medical education.

Objective: The objective of this paper is to show what Figured Worlds can offer in medical education. Having explained some of its central tenets, we apply it to an important tension in our field.

Application: The assumption that there is a uniform ‘good doctor’ identity, which must be inculcated into medical students, underlies much of what medical educators do, and what our regulators enforce. While diversity is encouraged when students are selected for medical school, pressure to professionalise students creates a drive towards a standardised professional identity by graduation. Using excerpts from reflective pieces written by two junior medical students, we review the basic concepts of Figured Worlds and demonstrate how it can shed light on the implications of this tension. Taking a Bakhtinian approach to discourse, we show how Adam and Sarah develop their professional identities as they negotiate the multiple overlapping and competing ways of being a doctor which they encounter in the world of medical practice. Each demonstrates agency by ‘authoring’ a unique identity in the cultural world of medicine, as they appropriate and re-voice the words of others.

Discussion: Finally, we consider some important areas in medical education where Figured Worlds might prove to be a useful lens: the negotiation of discourses of gender, sexuality and social class, career choice as identification within specialty-specific cultural worlds, and the influence of hidden and informal curricula on doctor identity.