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van der Sande, Robin (author), Deshmukh, R.S. (author), Shekhar, A. (author), Bauer, P. (author)When operating a modular multilevel converter (MMC), a margin appears between the arm voltage and sum capacitor voltage corresponding to the power dependent ripple. This margin can be used to enhance the DC link voltage and increase the transfer capacity of an MMC-based distribution link while keeping the submodule (SM) stresses fixed....conference paper 2023
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Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)The load profile of the power converter in EV Fast charging applications involves a short high-current pulse for rapid charging of the EV battery leading to thermal cycles on the power electronic devices. These thermal cycles can cause thermo-mechanical fatigues, which consume the power devices’ lifetime. Also, different timescales and magnitude...conference paper 2023
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Shekhar, A. (author), Rituraj, G. (author), van der Sande, Robin (author), Ahmadi, M. (author), Deshmukh, R.S. (author), Bauer, P. (author), Nougain, V. (author), Lekić, A. (author), Palensky, P. (author)Reliable Power Electronic Systems (PES) are vital for enabling energy transition technologies of the future. Power hardware-in-the-Loop (PHIL) test bed can be used to validate such systems cost-effectively and time-efficiently. In general, the Real Time Digital Twin (RTDT) is a virtual representation of the PES and its operating environment that...conference paper 2023
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Ahmadi, M. (author), Shekhar, A. (author), Bauer, P. (author)Power electronics converters are crucial for power generation, transmission, and distribution. The modular multilevel converter (MMC) is highly valued for its ability to handle high power levels, versatility in reconfiguration, high efficiency through small-capacity submodules (SMs), and robust control capabilities. A failure of a power...conference paper 2023
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Kardan Halvaei, F. (author), Ahmadi, M. (author), Shekhar, A. (author), Bauer, P. (author)EV Fast chargers are crucial to alleviate the driving range anxiety for E-mobility applications. A typical converter load profile consists of a short high-current pulse to rapidly refill the EV battery followed by a cooling-off period once the charging is completed. Power electronic components experience thermal cycles as a result, which can...conference paper 2023
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Molenaar, M. (author), Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)The reliability of semiconductor power devices can be studied by performing a thermal and power cycling test. In order to create the desired temperature cycles, there are four free variables to select during the power cycling test, namely the heating current, heating time, cooling time, and heatsink temperature. In this paper, the relation...conference paper 2023
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Deshmukh, R.S. (author), Rituraj, G. (author), Lock, Niels (author), Vahedi, H (author), Shekhar, A. (author), Bauer, P. (author)Power electronics converters (PEC) play a crucial role in interfacing renewable energy systems and electrolyzers to ensure a high production yield of green hydrogen. The design of such PEC is not straightforward due to the safety hazards of using multiple electrolyzer stacks and converter modules at industrial levels. Therefore, real-time...conference paper 2023
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Kardan Halvaei, F. (author), Shekhar, A. (author), Bauer, P. (author)EV fast chargers are essential in addressing the concern of limited driving range for E-mobility applications. However, the load profile of a converter for fast charging involves a high-current pulse that can last for a few minutes to efficiently replenish the EV battery, which is followed by a cooldown period after the charging process is...conference paper 2023
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Deshmukh, R.S. (author), Rituraj, G. (author), Vahedi, H (author), Shekhar, A. (author), Bauer, P. (author)Electrolysis requires a high DC current at low voltage to produce hydrogen from water. Designing power converters for such a load requirement could be challenging while fulfilling the galvanic isolation needs. Therefore, prior knowledge of the electrolyzer's impact on the converter operation should be needed. In this context, this paper...conference paper 2023
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Ahmadi, M. (author), Shekhar, A. (author), Bauer, P. (author)Power electronic converters (PECs) are workhorses of emerging distribution networks. PEC interfaced grids can function as flexible power corridors facilitating compact and efficient energy exchange between distribution generation, load and storage elements. Introducing adequate Reconfigurability, Modularity, and Redundancy (RMR) in such PEC...conference paper 2022
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Deshmukh, R.S. (author), Shekhar, A. (author), Bauer, P. (author)Electrolysis holds tremendous potential in reducing the carbon footprint and providing energy dense fuels such as methane. Such systems can be integrated with renewable energy systems with the aid of power electronics interfaces. However, this integration is not straight-forward and imposes various converter design challenges. This paper...conference paper 2022
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Ahmadi, M. (author), Shekhar, A. (author), Bauer, P. (author)Power electronics converters will play a crucial role in power grid expansion. Superior advantages offered by MMC make it the most popular candidate amongst various converter topologies. However, due to a large number of components installed within MMC, reliability analysis is an unavoidable task that needs to be carried out to maximize the MMC...conference paper 2022
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De Herdt, Lode (author), Shekhar, A. (author), Yu, Y. (author), Chandra Mouli, G.R. (author), Dong, J. (author), Bauer, P. (author)A simple and low-cost Power Hardware-in-the-Loop (PHIL) demonstrator is developed for the purpose of studying the impact of Electric Vehicle (EV) charging on low voltage distribution grids. An energy saving power circulating method with potential bi-directional function is proposed in this study as well. The distribution grid under test runs on...conference paper 2021
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Shekhar, A. (author), Chandra Mouli, G.R. (author), Bandyopadhyay, S. (author), Bauer, P. (author)DC traction networks that supply power to trolley-buses, tramcars and trains can be simultaneously used to integrate fast-charging stations for Electric Vehicles (EVs). This strategy improves the traction grid utilization of urban transportation systems. In addition, it offers a potential solution to the increasing requirement of charging...conference paper 2021
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Wagh, Saumitra (author), Yu, Y. (author), Shekhar, A. (author), Chandra Mouli, G.R. (author), Bauer, P. (author)Mass deployment of Electric Vehicles (EVs) can improve the loading characteristics of low voltage distribution grids with high Photovoltaic (PV) penetration. This impact is investigated in the paper from two point of views, namely, the EV charger type and the EV penetration level. Based on the measured usage data for home, public and semi-public...conference paper 2021
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Wu, Y. (author), Shekhar, A. (author), Soeiro, Thiago B. (author), Bauer, P. (author)The grid reinforcement and energy redirection needs have led to the emergence of Back-To-Back Voltage Source Converter (BTB-VSC) based dc power routers. This paper investigates the low frequency Common Mode Currents (CMCs) that arise in the system if the employed BTB-VSCs have an un-isolated ac path connected in parallel to their output ports....conference paper 2021
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Wu, Y. (author), Soeiro, Thiago B. (author), Shekhar, A. (author), Xu, J. (author), Bauer, P. (author)LCL filter is widely adopted for strict standard compliance of grid-tied voltage source converters (VSCs). The third order low-pass filtering provides great attenuation for the high frequency harmonics generated by the power electronics guaranteeing low output currents noise injection into the grid. A major concern of the implementation of the...conference paper 2021
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Yu, Y. (author), Shekhar, A. (author), Chandra Mouli, G.R. (author), Bauer, P. (author), Refa, Nazir (author), Bernards, Raoul (author)This study aims to quantity the impact of uncontrolled charging of Electric Vehicles (EVs) on the low voltage distribution networks with increasing EV penetration levels. For this objective, key indicators are developed to show the magnitude, scale and duration of the impact on the distribution network. The disseminated results are based on the...conference paper 2020
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Wu, Y. (author), Shekhar, A. (author), Soeiro, Thiago B. (author), Bauer, P. (author)Back-To-Back (B2B) Voltage Source Converter (VSC) with AC-side LCL filters can be adopted for parallel AC-DC distribution links. In this paper, Grid-side Current Control (GCC) for the inner/fast control loops of the front- and backend power electronics are implemented in order to enhance the system performance against grid disturbances. Herein,...conference paper 2019
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Shekhar, A. (author), Soeiro, Thiago B. (author), Ramirez Elizondo, L.M. (author), Bauer, P. (author)During the operation of a three line ac link in parallel with a ac-dc-ac link system that employs Back-to-Back (B2B)Medium Voltage Modular Multilevel Converters (MMC), a path for the low frequency zero sequence currents is shown to exist. Apart from causing additional losses, these currents can result in limitations on power capacity. A...conference paper 2019
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