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Publications

Publications by CPES

2022

Integration of a V2G charging station in a smart Prosumer household via a cloud-based energy management system considering ToU tariffs

Authors
Grasel, B; Serodio, C; Mestre, P; Baptista, J; Tragner, M; Reisenbauer, H;

Publication
SEST 2022 - 5th International Conference on Smart Energy Systems and Technologies

Abstract
Bidirectional electric vehicle charging stations (EVSE) offer new business models for private users and companies such as Demand Response. Even if first standards for smart charging (ISO 15118, OCPP) are established, no commercial turnkey solution for the integration of a vehicle to grid (V2G) charging station into a smart prosumer household exists yet. This study shows a possible concept for the integration of a V2G charger for a vehicle to home (V2H) use case. A smart controller for a prosumer household is developed allowing the interconnection of different types of electrical equipment like a V2G charger, a photovoltaic system for electricity generation, a heat pump for heating. Therefore, different interfaces such as Modbus TCP, Modbus RTU, OCPP, HTTP are used. An algorithm is developed to charge the vehicle at low electricity prices or at times of overproduction of the PV system respective to discharge the car at high electricity prices or times of no PV production. The modular concept allows realizing the solution as a cloud-based service which can be applied to energy communities. © 2022 IEEE.

2022

Comparison of Supraharmonic emission measurement methods using real signals of a V2G charging station and a PV power plant

Authors
Grasel, B; Reis, MJCS; Baptista, J; Tragner, M;

Publication
SEST 2022 - 5th International Conference on Smart Energy Systems and Technologies

Abstract
The increased use of active power electronics for AC to DC conversion of electrical equipment causes emissions in the frequency range between 2-150kHz (Supraharmonic frequency range). Currently two different methods (IEC61000-4-30 and IEC61000-4-7) to measure supraharmonic emissions are used. In this study, the two methods are compared to each other by means of real measured signals. While other studies used synthesized signals, this study investigates real measured signals of a bi-directional electric vehicle (EV) charging station and a photovoltaic (PV) power plant. The signals indicate narrowband, wideband and time-varying emissions. The method described in IEC61000-4-30 Ed.3 offers benefits analyzing wideband emissions due to reduced data. Nevertheless, as the method is non-gapless, big deviations to IEC61000-4-7 and to a gapless method occur. Especially at time-varying signals the deviation reaches up to 50%. The method according to IEC61000-4-30 Ed.3 shows good results for constant level of emissions only. In reality, this is rarely the case, as emissions often get superimposed by other signals. The IEC 61000-4-7 method generates many data, but allows detailed investigations of narrowband emissions and as the measurement is gap-less time-varying emissions are detected properly. © 2022 IEEE.

2022

REVIEW OF ENERGY AUDIT AND BENCHMARKING TOOLS TO STUDY ENERGY EFFICIENCY THROUGH REDUCING CONSUMPTION IN WASTEWATER TREATMENT SYSTEMS

Authors
Esteves, F; Cardoso, JC; Leitao, S; Pires, EJS; Baptista, J;

Publication
CADERNOS EDUCACAO TECNOLOGIA E SOCIEDADE

Abstract
Wastewater treatment systems are major consumers of electricity being responsible for 3 to 5% of global energy consumption, and 56% of greenhouse gas emissions into the atmosphere in the water treatment sector. Climate change currently imposes the definition of a new pattern of human behavior in the defense and sharing of a common space that is the planet, so the optimization of water treatment models plays a crucial role in the definition of sustainability strategies as part of the challenges for decarbonization by 2050. The physical-chemical characteristics of the influent, the treatment techniques and associated technologies and the unpredictability of external phenomena of inefficiency transform wastewater treatment plants (WWTPs) into complex systems, sometimes difficult to understand. The study of energy efficiency plays an important role in the emergence of a standard behavior model, which allows the correction of unbalanced situations in the expected energy consumption. Given the importance of the topic, the present review aims to study energy auditing techniques and benchmarking tools developed for the wastewater treatment sector to reduce the current electricity consumption, which could represent up to 90% of total energy consumption. The result of the research was organized according to the criteria defined for the characterization of auditing techniques and benchmarking tools. A review was conducted from 51 scientific papers from different reference research platforms published in the last 20 years according to the keywords. This literature review has shown that there are, in the classification of consumption reduction, energy auditing and benchmarking tools; energy management techniques and methods directed to the energy efficiency of the treatment stages and specific equipment; and, finally, decision support tools. According to the methodology followed, it was possible to conclude that although the concern is not recent, there are techniques and tools for assessing energy performance more suitable for the wastewater sector. However, the authors recognize that associated with the complexity of wastewater treatment systems, inefficiency phenomena still strongly impact energy efficiency assessment, so the contributions for their identification and quantification may represent an added value for data analysis, systematization, and optimization methodologies.

2022

Circuit Feedback of bidirectional E-Charging Stations

Authors
Grasel, B; Tragner, M; Baptista, J;

Publication
ELEKTROTECHNIK UND INFORMATIONSTECHNIK

Abstract

2022

Netzrückwirkungen bidirektionaler E-Ladestationen

Authors
Grasel, B; Tragner, M; Baptista, J;

Publication
Elektrotech. Informationstechnik

Abstract

2022

On-line atracurium dose prediction: a nonparametric approach

Authors
Rocha, C; Mendonça, T; Silva, ME;

Publication
IEEE Conference on Control Technology and Applications, CCTA 2022, Trieste, Italy, August 23-25, 2022

Abstract
This paper aims at contributing to personalize anesthetic drug administration during surgery. This study devel-ops an online robust model to predict the maintenance dose of atracurium necessary for the resulting effect, i.e. neuromuscular blockade, to attain a target profile. The model is based on the patient's neuromuscular blockade (NMB) response to the initial bolus only, overcoming the need for information on the patient's weight, age, height and Lean Body Mass usually associated to pharmacokinetic and pharmacodynamic models. To achieve this, a statistical analysis of the response of the patient to the initial bolus is carried out and a set of variables is established as predictors of the maintenance dose. The prediction is accomplished using Classification and Regression Trees, CART, which is a supervised learning method. Simulated data from a stochastic model for the NMB induced by atracurium is used as training set. All the 5000 doses predicted by the model lead to NMB level between 5% and 10%, which supports the proposed predictive model since it is clinically required that the steady state NMB level lies between this two values. The methodology is applied both to simulated and to clinical data sets and is found appropriate for online dose prediction.

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