1,721,017 research outputs found
A Jigsaw Approach for Electrical Engineering: Transient Stability Analysis of a Synchronous Machine
No full textA Review of Primary and Secondary Control for Islanded No-Inertia Microgrids
No full textMicrogrid (MG) control represents an impactful and important topic in current academic and industry research related to power systems. MG operations can be distinguished in grid-connected and islanded operations. Among these two, islanded operation is for sure the more challenging since the MG control need to cope with voltage and frequency regulation that is usually not a problem for grid connected ones. Achieving these goals become even more complex if no-inertia MGs are considered i.e. MG where no synchronous generation is directly connected to the grid. This paper proposes a detailed review of state-of-the-art architecture for the hierarchical control of islanded, no-inertia MGs in order to highlight its characteristics and limitation with the aim of providing a suitable background for further developments of control approaches for this kind of applications
Problem-Based Learning Activity for Electrical Engineering: Unconventional Load Flow Assignments
No full textSimplified Conditions for the Evaluation of Droop-Controlled Microgrids Stability
No full textThe control logic of a Microgrid (MG) represents one of the most important topic in power system engineering research. The most common and well-known control logic is represented by the droop one, that allows each MG source to share the power request and to participate to the frequency and voltage controls. In order to reach this goal, the stability of this control logic is fundamental and it is important to understand if a determined working point can be reached. In this paper a new stability condition, based on a mathematical framework and with some simplifying assumptions is presented. The proposed approach has the advantage of being a fast calculation that can predict the reachability of a particular working point that reflects a particular load request without using numerical algorithm or software simulators. The proposed methodology is finally validated with two simulations realized on PSCAD-EMTDC
New Approaches to Reactive Power Sharing and Voltage Control in Islanded AC Microgrids
No full textAdvanced dynamic control strategies are
presented to approach primary voltage control and reactive
power sharing among Grid-Supporting inverters interfacing
production units in AC islanded Microgrids (MG). After
defining the MG structure and the power system model used in
the analytical analysis, new methods are introduced and
analyzed. Then, a setting procedure of control parameters is
developed in order to meet the requirements of a correct power
sharing, voltage stability and maintenance of acceptable voltage
profile. Next, a comparison among the new approaches and the
conventional droop results is performed, by means of dedicated
simulations on a common benchmark network in order to show
advantages of the new approaches
Vehicle-to-Home Service via Electric Vehicle Energy Storage Virtual Partitioning
No full textThe need for a change in view of a sustainable energy transition is introducing novel challenges in many fields such as power production, transmission, distribution and utilization. On the user side, defining new strategies to reach energy neutrality and sustainability is an important step in this process. This paper proposes a novel Virtual Partitioning Algorithm (VPA) for Electric Vehicles (EVs) energy storage system to provide vehicles-to-home (V2H) services in a novel and effective manner. The VPA will improve the environmental and economic performance of prosumers with residential photovoltaic or other renewable energy systems by exploiting the energy storage availability of EVs in an effective way. The VPA for V2H services is applied to realistic residential single-family and multi-family housing test cases using real measured data. Results highlight the positive impact of the proposed approach both from an economic and energy sustainability point of view
Electric Vehicle Battery Virtual Partitioning Algorithm for Residential Vehicle-to-Home Service
No full textThe current trend of electrification and transition to a sustainable and resilient electricity energy scenario is introducing new challenges and necessary improvements on the generation, transmission, distribution and end-user side. These changes require introducing novel solutions to exploit at maximum the potentials of the ongoing electrification of several sectors, especially at customer level. This paper proposes a novel Virtual Partitioning Algorithm (VPA) dedicated to vehicles-to-home (V2H) service provided by private Electric Vehicles (EVs). The VPA will allow improving the environmental and economic performance of prosumers that have residential photovoltaic plants without the need of installing dedicated flexibility devices, e.g. battery energy storage systems (ST), or integrating existing storage units to expand the overall capacity without additional costs. This will help moving in the direction of a more sustainable energy scenario for buildings and energy systems also in the frame of novel configuration such as renewable energy communities. The proposed solution has been tested in a realistic residential setup with real data and the results highlighted the benefits from both the system integration and economic side
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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