2 resultados para Heat pumps, load modelling, power quality, power system dynamics, power system simulation

em Instituto Politécnico de Viseu


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Purpose – The paper examines from a practitioner’s perspective the European Quality in Social Services (EQUASS) Assurance standard, a certification programme for European social service organisations to implement a sector-specific Quality Management System. In particular, it analyses the adoption motives, the internalisation of the standard, the impacts, the satisfaction and the renew intentions. Design/methodology/approach – This study uses a cross-sectional, questionnaire-based survey methodology. From the 381 organisations emailed, 196 responses coming from eight different European countries were considered valid (51.4%). Data from closed-ended questions were analysed using simple descriptive statistical techniques. Content analysis was employed to analyse practitioner’s comments to open-ended questions. Findings – It shows that social service providers typically implement the certification for internal reasons, and internalise EQUASS principles and practices in daily usage. EQUASS Assurance produces benefits mainly at the operational and customer levels, whereas its main pitfalls include increased workload and bureaucracy. The majority of respondents (85.2%) are very satisfied or satisfied with the certification, suggesting that it meets their expectations. Certification renewal intentions are also high but some respondents report that the final decision depends on several factors. The insights gained through the qualitative data are also described. Practical implications – It can be helpful to managers, consultants and Local License Holders working (or planning to work) with this standard. It can inform the work of the EQUASS Technical Working Group in the forthcoming revision of the standard. Originality/value – This is the largest survey conducted so far about EQUASS Assurance in terms of number of respondents, participating countries and topics covered.

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Power flow calculations are one of the most important tools for power system planning and operation. The need to account for uncertainties when performing power flow studies led, among others methods, to the development of the fuzzy power flow (FPF). This kind of models is especially interesting when a scarcity of information exists, which is a common situation in liberalized power systems (where generation and commercialization of electricity are market activities). In this framework, the symmetric/constrained fuzzy power flow (SFPF/CFPF) was proposed in order to avoid some of the problems of the original FPF model. The SFPF/CFPF models are suitable to quantify the adequacy of transmission network to satisfy “reasonable demands for the transmission of electricity” as defined, for instance, in the European Directive 2009/72/EC. In this work it is illustrated how the SFPF/CFPF may be used to evaluate the impact on the adequacy of a transmission system originated by specific investments on new network elements