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The concept of high-voltage DC transmission using a multiterminal configuration is presently a central topic of research and investment due to rekindled interest in renewable energy resource integration. Moreover, great attention is given to fault analysis, which leads to the necessity of developing proper tools that enable proficient dynamic simulations. This paper leverages models and control system design techniques and demonstrates their appropriateness for scenarios in which faults are applied. Furthermore, this paper relies on full-bridge submodule topologies in order to underline the increase in resilience that such a configuration brings to the multiterminal DC network, after an unexpected disturbance. Therefore, strong focus is given to fault response, considering that converters use a full-bridge topology and that overhead power lines connect the terminals.
Ioan-Cătălin Damian; Mircea Eremia; Lucian Toma. Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules. Energies 2021, 14, 1653 .
AMA StyleIoan-Cătălin Damian, Mircea Eremia, Lucian Toma. Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules. Energies. 2021; 14 (6):1653.
Chicago/Turabian StyleIoan-Cătălin Damian; Mircea Eremia; Lucian Toma. 2021. "Fault Simulations in a Multiterminal High Voltage DC Network with Modular Multilevel Converters Using Full-Bridge Submodules." Energies 14, no. 6: 1653.
Microgrids are about to change the architecture and the operation principles of the future power systems towards smartness and resiliency. Power electronics technologies are key enablers for novel solutions. In this paper we analyze the benefits of a “microgrid by design” architecture (MDA), using a solid-state transformer (SST) as a low-voltage grid-former and inverter-based generation only. In this context, the microgrid stability is maintained with the help of “electrostatic energy inertia” that can be provided by the capacitor connected to the DC busbar behind the SST inverter topology. This happens in a natural way, alike the mechanical inertia in power systems with synchronous machines, however without depending on frequency and without the need of a rotational inertia. This type of microgrid always operates (both fully connected to the main grid or in islanding mode) with all the necessary mechanisms needed to maintain the microgrid stable—no matter of the perturbations in the upstream of the point of common coupling (PCC). In the case of microgrids with inverter-based generation only (including the energy storage systems), there is no mechanical inertia and different stability mechanisms need to be applied compared to the stability principle of the classical power systems. Our proposed mechanism differentiates from the recently proposed stability assessments of microgrids based on virtual synchronous generators from the control theory perspective. This paper is a continuation of our previous work where the MDA was first introduced. The use-cases and scenarios are based on realistic and yet reasonable complexities, by coupling the disturbance magnitude with the voltage stability limit in power grids. The paper finds meaningful disturbances to test the electrostatic energy inertia at the boundaries of grid stability, as guidance to understand the range of voltage variation for extreme conditions. The results show that in microgrids with inverter-based generation only and passive loads (RLC type) the operation is no longer frequency dependent. The energy of the DC busbar capacitor as electrostatic energy inertia of the MDA has a role similar to that of the rotational machines in classical grids in terms of maintaining dynamic stability, however impacting two different types of stability.
Mihai Sanduleac; Lucian Toma; Mircea Eremia; Irina Ciornei; Constantin Bulac; Ion Triștiu; Andreea Iantoc; João F. Martins; Vitor F. Pires. On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability. Energies 2019, 12, 3274 .
AMA StyleMihai Sanduleac, Lucian Toma, Mircea Eremia, Irina Ciornei, Constantin Bulac, Ion Triștiu, Andreea Iantoc, João F. Martins, Vitor F. Pires. On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability. Energies. 2019; 12 (17):3274.
Chicago/Turabian StyleMihai Sanduleac; Lucian Toma; Mircea Eremia; Irina Ciornei; Constantin Bulac; Ion Triștiu; Andreea Iantoc; João F. Martins; Vitor F. Pires. 2019. "On the Electrostatic Inertia in Microgrids with Inverter-Based Generation Only—An Analysis on Dynamic Stability." Energies 12, no. 17: 3274.
Adrian Toni Radu; Mircea Eremia; Lucian Toma. Optimal Charging of Electrical Vehicles in the Smart City for Loss Minimization and Voltage Improvement. Scientific Bulletin of the "Petru Maior" University of Tirgu Mures 2017, 14, 17 .
AMA StyleAdrian Toni Radu, Mircea Eremia, Lucian Toma. Optimal Charging of Electrical Vehicles in the Smart City for Loss Minimization and Voltage Improvement. Scientific Bulletin of the "Petru Maior" University of Tirgu Mures. 2017; 14 (1):17.
Chicago/Turabian StyleAdrian Toni Radu; Mircea Eremia; Lucian Toma. 2017. "Optimal Charging of Electrical Vehicles in the Smart City for Loss Minimization and Voltage Improvement." Scientific Bulletin of the "Petru Maior" University of Tirgu Mures 14, no. 1: 17.
To better serve customers, operators need to identify ways to improve the reliability of their electrical service. This paper provides a methodology and framework for the development of new control architectures based on uncertainty management and self-reconfigurability. We designed an architecture for Smart Grid able to integrate the standard control strategy with safety and security aspects. A case study presents details on how the current methods for the assessment of the system security can be applied on the proposed architecture.
Gheorghe Florea; Radu Dobrescu; Oana Chenaru; Mircea Eremia; Lucian Toma. Methodology and Framework for Development of Smart Grid Control. Econometrics for Financial Applications 2016, 319 -327.
AMA StyleGheorghe Florea, Radu Dobrescu, Oana Chenaru, Mircea Eremia, Lucian Toma. Methodology and Framework for Development of Smart Grid Control. Econometrics for Financial Applications. 2016; ():319-327.
Chicago/Turabian StyleGheorghe Florea; Radu Dobrescu; Oana Chenaru; Mircea Eremia; Lucian Toma. 2016. "Methodology and Framework for Development of Smart Grid Control." Econometrics for Financial Applications , no. : 319-327.
S. S. (Mani) Venkata; Mircea Eremia; Lucian Toma. Background of Power System Stability. Handbook of Electrical Power System Dynamics 2013, 453 -475.
AMA StyleS. S. (Mani) Venkata, Mircea Eremia, Lucian Toma. Background of Power System Stability. Handbook of Electrical Power System Dynamics. 2013; ():453-475.
Chicago/Turabian StyleS. S. (Mani) Venkata; Mircea Eremia; Lucian Toma. 2013. "Background of Power System Stability." Handbook of Electrical Power System Dynamics , no. : 453-475.