Design and Accuracy Analysis of Multilevel State Estimation Based on Smart Metering Infrastructure

© 1963-2012 IEEE. While the initial aim of smart meters is to provide energy readings for billing purposes, the availability of these measurements could open new opportunities for the management of future distribution grids. This paper presents a multilevel state estimator that exploits the smart meter measurements for monitoring both low and medium voltage grids. The goal of this paper is to present an architecture that is able to efficiently integrate smart meter measurements and to show the accuracy performance achievable if the use of real-Time smart meter measurements for state estimation purposes was enabled. The design of the state estimator applies the uncertainty propagation theory for the integration of the data at different hierarchical levels. The coordination of the estimation levels is realized through a cloud-based infrastructure, which also provides the interface to auxiliary functions and the access to the estimation results for other distribution grid management applications. A mathematical analysis is performed to characterize the estimation algorithm in terms of accuracy and to show the performance achievable at different levels of the distribution grid when using the smart meter data. Simulations are presented, which validate the analytical results and demonstrate the operation of the multilevel estimator in coordination with the cloud-based platform

Design and accuracy analysis of multi-level state estimation based on smart metering infrastructure

While the first aim of smart meters is to provide energy readings for billing purposes, the availability of these measurements could open new opportunities for the management of future distribution grids. This paper presents a multi-level state estimator that exploits smart meter measurements for monitoring both low and medium voltage grids. The goal of the paper is to present an architecture able to efficiently integrate smart meter measurements and to show the accuracy performance achievable if the use of real-time smart meter measurements for state estimation purposes were enabled. The design of the state estimator applies the uncertainty propagation theory for the integration of the data at the different hierarchical levels. The coordination of the estimation levels is realized through a cloud-based infrastructure, which also provides the interface to auxiliary functions and the access to the estimation results for other distribution grid management applications. A mathematical analysis is performed to characterize the estimation algorithm in terms of accuracy and to show the performance achievable at the different levels of the distribution grid when using the smart meter data. Simulations are presented, which validate the analytical results and demonstrate the operation of the multi-level estimator in coordination with the cloud-based platform

Crack mitigation in concrete : superabsorbent polymers as key to success?

Cracking is a major concern in building applications. Cracks may arise from shrinkage, freeze/thawing and/or structural stresses, amongst others. Several solutions can be found but superabsorbent polymers (SAPs) seem to be interesting to counteract these problems. At an early age, the absorbed water by the SAPs may be used to mitigate autogenous and plastic shrinkage. The formed macro pores may increase the freeze/thaw resistance. The swelling upon water ingress may seal a crack from intruding fluids and may regain the overall water-tightness. The latter water may promote autogenous healing. The use of superabsorbent polymers is thus very interesting. This review paper summarizes the current research and gives a critical note towards the use of superabsorbent polymers in cementitious materials

Experimental Based Evaluation of PV Inverters Harmonic and Interharmonic Distortion Due to Different Operating Conditions

This paper presents the results of comprehensive testing and subsequent detailed analysis of the obtained test results, evaluating harmonic and interharmonic performances of photovoltaic inverters (PVInvs) for a range of different operating conditions. The presented results indicate significant power-dependent changes in harmonic and interharmonic emissions of tested PVInvs for different supply voltage conditions (presence of voltage waveform distortions and various source impedance values). To correctly quantify and describe these changes in PVInv performance, this paper discusses and applies measurement procedures and metrics for evaluating harmonic and interharmonic emission recommended in existing standards, as well as some additional metrics and indicators. For some operating conditions, tested PVInvs significantly increase both harmonic and interharmonic emissions, and this paper also discusses the impact of PVInv control (e.g., maximum power point tracking control) as a possible origin of the interharmonic distortion

Panel 5 Rural Intangible Cultural Heritage

Rural areas is the place where rural intangible heritage is found rich and diverse, whereas vulnerable to fast social, cultural, political and economic transformations, in particular in developing and underdeveloped areas. Although the concept of Intangible Cultural Heritage (ICH) has been established in UNESCO and accepted by many ICH Convention signatories, it has not been consistently adopted and implemented from international level to local level without divergencies. An analysis of rural ICH is to analyse how rural traditional culture, memories and past are used by different stakeholders for current society. (Re)defining rural ICH is a way to both rethink and develop the existing concepts of cultural heritage held by national and institutional discourses. This panel, which investigates three cases in China and Egypt, will provide evidence and theoretical rethought on the making and use of the concept of ICH in developing countries where the tangible heritage discourses have been well established and the intangible heritage discourse is polemical. These three papers will present diverse and emerging uses and discourses of ICH in terms of conservation, exhibition, commodification, education and musealisation from various perspectives. In particular, this panel will address these issues: 1. How is ICH, or intangible heritage, used in rural areas in the fields of heritage tourism, museum, cultural industries, community development and other purposes? 2. How tourists, (non)-local visitors and other stakeholders contribute to the making of ICH through their cultural practices? 3. How can tangible and intangible heritage be understood and managed in an integrated/holistic approach such as the living heritage approach? 4. Are existing tangible-centred mechanism and managerial tools still useful for rural ICH which relates to local community, tangible elements and the landscape? If not, what improvements should be made