Ricardo Ferreira

A new bi-directional charger for vehicle-to-grid integration

Bidirectional and efficient on-board charger systems for electric vehicles is a challenge nowadays. This paper describes a novel power converter system that implements bidirectional flow between the grid and an electric vehicle battery, where a dual active bridge is advantageous. With a bidirectional topology and proper control all the major grid constraints, such as power quality, harmonic rejection, active and reactive power control, and others, can be easily satisfied. A hardware prototype of the power converter is built. Experimental results from this hardware prototype verify the preliminary operation and claims of the V2G power interface.

Fractional occupation in the hartree-fock method

Abstract It is shown that ϵ i HF = ϵ i Xα if we allow fractional occupation in the Hartree-Fock formalism and substitute the local Xα potential for the non-local exchange potential. Calculations of ionization energies of closed-shell atoms show that the proposed method is as accurate, and simpler than the standard transition-operator techniques.

Reliability impact on bulk generation system considering high penetration of electric vehicles

This paper presents a generation adequacy evaluation based on analytical calculation, considering electric vehicles. The scenarios used are exploring electric vehicles penetrations in six different European countries, in order to assess their impact on the security of supply. An analytical method is developed to perform this evaluation. Afterwards, a discussion about the accuracy of this methodology is done and the differences between this approach and a flexible Sequential Monte Carlo Simulation are identified

Regulatory issues in the deployment of distributed storage devices in distribution networks

In this paper, a number of possibilities are presented and discussed for the ownership of distributed storage devices (DSD) in a Smart Grid environment. The cases in which the distribution system operator (DSO) has either full control (grid owned storage) or no control whatsoever over the operation of the DSD (independently owned storage) will be differentiated. For each ownership possibility, the technical and regulatory implications are discussed, with analysis and validation of the results being performed on real MV distribution networks, both rural and urban. In order to evaluate each ownership possibility, a number of multi-period optimization models are presented, corresponding to different assumptions in regards to the operation of the DSD. The resulting daily operation strategies are subsequently used as a basis for carrying out distribution reinforcement planning.

Data Quality in HL7 Messages -- A Real Case Analysis

The development of eHealth technologies over the last few years has been pushing healthcare institutions to evolve their own infrastructures. Along with this evolution, critical systems now need to use communication standards such as HL7 or DICOM in order to exchange information in a more meaningful and efficient way. However, healthcare institutions often experience complications when different systems communicate directly even when using communication standards. We aim to assess the quality of the data present in HL7 messages exchanged between different critical systems in a large healthcare facility and therefore propose an integration infrastructure that allows a real time and centralized way to manage, route and monitor the integration flows between various systems.

Visualization of Passively Extracted HL7 Production Metrics

The improvements made to healthcare IT systems made over the past years led to the creation of a multitude of different applications essential to the institutions daily operations. Aim: We aim to create and install a system capable of displaying production metrics for healthcare management with little requirements, efforts and software providers involved. Methods: We propose a system capable of displaying production metrics for healthcare facilities, by extracting HL7 messages and other eHealth relevant protocols directly from the institution´s network infrastructure. Our system is then able to populate a knowledge database with meaningful information derived from the gathered data. Results: Our system is currently being tested on a large healthcare facility where it extracts and analyses a daily average of 44,000 HL7 messages. The system is currently capable of inferring and displaying the daily distribution of healthcare related activities such as laboratory orders or even relevant billing information. Conclusion: HL7 messages moving over the network contain valuable information that can then be used to assess many relevant production metrics for the entire facility and from otherwise non-interoperable production systems that, in most cases, can only be seen as black boxes by other system integrators.

Operational Reserve Assessment Considering Wind Power Fluctuations in Power Systems

Discussions on innovative criteria, operation strategies, and assessment tools are important insights when monitoring the security of supply considering renewable power sources for the years to come. In order to deal with the power fluctuations that come from wind uncertainties, this chapter explores a probabilistic methodology based on the chronological Monte Carlo simulation (MCS) to evaluate the long-term reserve requirements of generating systems considering wind energy sources. A new alternative to assess the power amount needs to adequately meet all assumed deviations is presented. Case studies with the IEEE-RTS 96 generating systems and some planning configurations of the Portuguese and Spanish generating systems are presented and discussed.