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"Dynamic Electrical Circuit Modeling of a Proton Exchange Membrane Elec" by Md Biplob Hossain, Md Rabiul Islam et al.

Besides producing hydrogen from surplus renewables, electrolyzers can also provide grid ancillary services like enhancing the stability, resilience, and robustness of the power grid. The paper presents a novel electrical circuit model for a proton exchange membrane electrolyzer (PEMEL) that has been validated using experimental data from a 400W electrolyzer. To demonstrate its adaptive capability, the proposed 400W electrical model is scaled up to a 1 MW stack, and this system is validated by comparison to another report of 1 MW stack experimental results. Results show that the developed model reproduces very similar step responses to those reported for the 400W electrolyzer and 1 MW stack. In this paper, the developed model was then used to evaluate the grid frequency response against disturbance, possible resilience advantages from frequency control services, and frequency sensitivity analysis for a modified IEEE-13-bus-distribution-feeder system. These simulations indicate that PEME ....

Activation Voltage Drops , Adaptation Models , Ancillary Service , Ircuit Stability , Requency Regulation Service , Frequency Response , Ntegrated Circuit Modeling , Power System Dynamics , Power System Stability ,

"H9 and H10 Transformer-less Solar Photovoltaic Inverters for Leakage C" by Sumaya Jahan, Md Faruk Kibria et al.

Now-a-days, transformer-less inverters integrating renewable energy resources as solar photovoltaic systems are commonly employed in many grid-connected distributed energy systems in both industrial and residential settings. Transformer-less photovoltaic (TLPV) inverters have attracted increased attention due to their unique advantages, such as increased efficiency, low cost, and ease of installation. Converting fluctuating solar dc power to consistent ac power has been a difficulty in the recent decade to avoid security risks like ground fault currents and leakage currents. Leakage current minimization is one of the most crucial factors in the TLPV inverters. Different TLPV inverter topologies have been presented in the past, with leakage current being reduced by galvanic isolation on the dc or ac side of the inverter, common mode voltage (CMV) clamping, and modulation techniques. This paper proposed two novel single-phase grid-tied TLPV inverter topologies with control blocks, which ....

Common Mode Voltage , Current Transformers , European Efficiency , Ntegrated Circuit Modeling , Leakage Current , Eakage Currents , Renewable Energy Sources , Total Harmonic Distortion , Ransformer Less Photovoltaic Inverter , Nipolar Sinusoidal Pulse Width Modulation ,

"Dynamic Electrical Equivalent Circuit Modeling of the Grid-Scale Proto" by Md Biplob Hossain, Md Rabiul Islam et al.

As the percentage of renewable energy sources grows, excess electrical power from renewables can be converted using electrolyzers to produce hydrogen, which can be stored, and later utilized by industries, homes, or the transportation system. Further, electrolyzers can also be utilized for frequency and voltage control to improve the stability of the power system. In this paper, a novel electrical circuit model for a 400W PEM electrolyzer is designed and validated using the experimental data from a reported paper for a 400W electrolyzer. To demonstrate its adaptive feature, the proposed 400W model is then scaled up to a 1 MW array by series and parallel connections, and the resulting system is validated by comparing it to another reported experimental results of a 1 MW stack. These results reveal that the developed model can reproduce very similar step responses to those obtained from experimental results from the reported 400W electrolyzer and the 1 MW stack. Finally, using the propos ....

Activation Voltage Drops , Adaptation Models , Ancillary Service , End Stability , Ircuit Stability , Frequency Deviation , Ntegrated Circuit Modeling , Mathematical Models , Power System Stability , Stability Analysis , Tility Scale Pem Electrolyzer ,

"An Electromagnetic Variable Inertance and Damping Seat Suspension with" by Pengfei Liu, Donghong Ning et al.

Abstract
This paper proposes a novel semi-active electromagnetic device with the capability of variable inertance and damping (VIVD) and an energy storage priority control (ESPC) strategy for vibration reduction of vehicle seat suspensions. The VIVD device can control its inertance and damping by adjusting resistances in a variable admittance (VA) circuit different from the traditional mechanical damper. The circuit and mechanical dynamics model of the VIVD seat suspension is analyzed and verified with tests, and the energy storage characteristic and controllability of the VIVD device are explored. Also, the frequency response characteristics of the VIVD device are derived from the admittance characteristics of the VA circuit. For the semi-active VIVD seat suspension, an H controller is designed to obtain the desired control force. An ESPC strategy is proposed to make the electromagnetic force of the VIVD device track the desired control force. The test results show that the V ....

Ldc Motors , Energy Harvesting , Ntegrated Circuit Modeling , Eat Suspension , Uspensions Mechanical Systems , Ariable Admittance , Ariable Damping , Ariable Inertance , Vibration Control ,