1,721,224 research outputs found
Interoperability Issues in PQ and PMU Measurements for Reduced Inertia Power Systems
No full textThe increasing installation of renewable energy sources threatens the correct functioning of power systems, affecting especially power quality and power system inertia. To tackle these issues, a possible solution consists of the placement of Phasor Measurement Units (PMUs) and Power Quality (PQ) meters which could enhance the system observability and real time control. Given the different characteristics and working principles of these devices, in this paper, we focus on the interoperability of PMUs and PQ meters. To achieve this, a distribution network including an extensive penetration of renewable energy sources is simulated, jointly with PMU and PQ meters. The correlation of their measurements is studied, arising issues in the aggregation and comparison of different measurements not only in high harmonic distortion but also in low-inertia conditions
Adverse drug event-related visits to the emergency department: 10-day intensive monitoring at the hospital of Varese
No full textCalcium signaling in human neutrophils induced by the endozepine TTN: pharmacological analysis of signal transduction pathways
No full textTracking Power Systems Events: PMU, Reporting Rate, Interpolation
No full textThe increasing penetration of renewable energy sources make modern power systems more prone to fast dynamics and system contingencies. In this scenario, Phasor Measurement Units (PMUs) are required not only to provide a snapshot of the system state at a given reporting time instant, but also to track the time evolution. This capability does not depend uniquely on the accuracy of the synchrophasor estimation algorithm, but more generally on the configuration of the PMU itself and how data is employed. In this context, the paper investigates the potential advantages and the open issues of PMU-based dynamic tracking using real-world datasets, discussing how different algorithms and reporting rates affect the overall results
Optimized 5G Communication Infrastructure for PMU-Based Distributed Measurement Systems
No full textIn recent years, there has been a rapid shift towards a fully digital paradigm in electrical substations. This shift is driven by the need for greater interoperability between different instruments and control actions, which is facilitated by the IEC 61850 series of standards. In this paper, we specifically focus on Phasor Measurement Units (PMUs) and their role in this digital transformation. One of the challenges in adopting high-performance wired communication standards such as Ethernet and TSN is the cost associated with wiring over long distances between substations. To overcome this limitation, we explore the feasibility of utilizing a 5G communication infrastructure to transmit PMU measurements. Our study simulates a real-world distribution network and assesses the worst-case latency between PMUs and Phasor Data Concentrator (PDC) by scaling the number of PMUs considered. With a mean communication latency of 20 ms, the 5G communication infrastructure proves to be a valuable solution, particularly in distribution networks where line lengths are relatively short
Fault simulation in Phasor Measurement Units: A study on system reaction time in a 5G network environment
Full text linkIn the era of electrical substation digitalization, the reliability of Phasor Measurement Units (PMUs) is crucial. This paper addresses the impact of fault conditions in PMUs on system reaction time, particularly when PMUs are transmitting data over a 5G network. Two types of faults are considered. Step faults affect PMUs for 100–150 ms. Synchronization loss can take up to 10 minutes to return to normal in the case of GPS. The first one considers the PMU losing its sync, although the communication subsystem remains stable. The second instead considers a fault also on the communication. In both cases, the Phasor Data Concentrator (PDC) should be able to detect these anomalies. Nevertheless, the overhead given by 5G latencies should not mask anomalies in the packets sent by healthy and affected PMUs. This study provides valuable insights into improving the robustness and reliability of real-time PMU systems in a 5G network environment
CAPACITA' DI PLECORINAL DI ERADICARE IN VITRO L'INFEZIONE PERSISTENTE DA VIRUS COXSACKIE B4. 30° CONGRESSO NAZIONALE SIM, CATANIA, 6-9 OTTOBRE 2002
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