The widespread adoption of renewable energy sources presents significant challenges for power system *** paper proposes a dynamic optimal power flow(DOPF)method based on reinforcement learning(RL)to ad-dress the dispa...
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The widespread adoption of renewable energy sources presents significant challenges for power system *** paper proposes a dynamic optimal power flow(DOPF)method based on reinforcement learning(RL)to ad-dress the dispatching *** proposed method consid-ers a scenario where large-scale offshore wind farms are inter-connected and have access to an onshore power grid through multiple points of common coupling(PCCs).First,the opera-tional area model of the offshore power grid at the PCCs is es-tablished by combining the prediction results and the transmis-sion capacity limit of the offshore power *** upon this,a dynamic optimization model of the power system and its RL en-vironment are constructed with the consideration of offshore power dispatching ***,an improved algorithm based on the conditional generative adversarial network(CGAN)and the soft actor-critic(SAC)algorithm is *** analyzing an improved IEEE 118-node system,the proposed method proves to have the advantage of economy over a longer *** resulting strategy satisfies power system opera-tion constraints,effectively addressing the constraint problem of action space of RL,and it has the added benefit of faster so-lution speeds.
This paper proposes a robust adaptive cruise control design based on Model Predictive Control (MPC) method, considering model uncertainties and external disturbances. Multiple model uncertainties, including uncertain ...
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This paper proposes a robust adaptive cruise control design based on Model Predictive Control (MPC) method, considering model uncertainties and external disturbances. Multiple model uncertainties, including uncertain environmental factors such as wind gusts and uncertainty in a power train system model, are characterized by a Linear Fractional Transform (LFT) method. Based on the LFT method, an upper bound of the error between the true uncertain system and the nominal prediction model is found based on linear matrix inequalities. Besides the model uncertainties mentioned above, the method considers an additive disturbance induced by modeling errors. A state observer simultaneously estimates the state and the additive disturbance within the control horizon to reduce the conservativeness of the error bound. Tightening constraints with the obtained error bound guarantees robust constraint satisfaction. Simulations performed on a CarSim-based high-fidelity vehicle model in a car-following scenario show that the proposed method can satisfy the constraints given in the MPC design in an uncertain environment with external disturbances. IEEE
The process of cocoa hybridization produces new types that have unique chemical properties impacting the manufacturing of chocolate yet are resistant to a number of plant illnesses. Image analysis is a valuable tool f...
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A metamaterial-integrated space-time-coding (STC) transmitting array incorporating direct antenna modulation (DAM) is proposed in this work to detect the multitarget vital sign signals, including respiration and heart...
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The security of digital images transmitted via the Internet or other public media is of the utmost *** encryption is a method of keeping an image secure while it travels across a non-secure communication medium where ...
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The security of digital images transmitted via the Internet or other public media is of the utmost *** encryption is a method of keeping an image secure while it travels across a non-secure communication medium where it could be intercepted by unauthorized *** study provides an approach to color image encryption that could find practical use in various *** proposed method,which combines four chaotic systems,employs singular value decomposition and a chaotic sequence,making it both secure and *** unified average change intensity,the number of pixels’change rate,information entropy analysis,correlation coefficient analysis,compression friendliness,and security against brute force,statistical analysis and differential attacks are all used to evaluate the algorithm’s *** a thorough investigation of the experimental data,it is concluded that the proposed image encryption approach is secure against a wide range of attacks and provides superior compression friendliness when compared to chaos-based alternatives.
This study investigates the biological effects of Low-Frequency Electromagnetic Fields (LF-EMF) on Saccharomyces cerevisiae yeast cells, an essential model organism in biological research. To achieve controlled exposu...
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With the advancements in voltage source converter(VSC)technology,VSC based high voltage direct current(VSCHVDC)systems provide system operators with a prospective approach to enhance system operating stability and ***...
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With the advancements in voltage source converter(VSC)technology,VSC based high voltage direct current(VSCHVDC)systems provide system operators with a prospective approach to enhance system operating stability and *** addition to long-distance transmission,the VSC-HVDC system can also provide multiple ancillary services,such as frequency regulation,due to its power ***,if a time delay exists in the control signal,the VSC-HVDC system may bring destabilizing influences to the system,which will decrease the system resilience under the *** order to reduce control deviation caused by time delay,in this paper,a small signal model is first conducted to analyze the impact of time delay on system *** a time-delay correction control strategy for HVDC frequency regulation control is developed to reduce the influence of the time *** control performance of the proposed time-delay correction control is verified both in the established small signal model and the runtime simulation in a modified IEEE 39 bus *** results indicate that the proposed time-delay correction control strategy shows significant improvement in system stability.
Over the past two decades, the rise in video streaming has been driven by internet accessibility and the demand for high-quality video. To meet this demand across varying network speeds and devices, transcoding is ess...
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The series connection of fast-switching SiC mosfets presents a promising approach to enhance the efficiency, compactness, and simplicity of medium voltage (MV) power converters. However, managing voltage imbalances du...
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This work presents a new class of micromachined electrostatic actuators capable of producing output force and displacement unprecedented for MEMS electrostatic *** actuators feature submicron high aspect ratio transdu...
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This work presents a new class of micromachined electrostatic actuators capable of producing output force and displacement unprecedented for MEMS electrostatic *** actuators feature submicron high aspect ratio transduction gaps lined up in two-dimensional *** an arrangement of microscale actuator cells allows the addition of force and displacements of a large number of cells(up to 7600 in one demonstrated array),leading to displacements ranging in the hundreds of microns and several gram forces of axial *** 50μm thick actuators with horizontal dimensions in the 1-4 millimeter range,an out-of-plane displacement of up to 678μm at 46 V,a bending moment of up to 2.0μNm,i.e.,0.08 N(~8 gram-force)of axial force over a 50μm by 2 mm cross-sectional area of the actuator(800 kPa of electrostatically generated stress),and an energy density(mechanical work output per stroke per volume)up to 1.42 mJ/cm3 was demonstrated for the actuators.
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