Aiming at the defect of large fluctuation of neutral point voltage control in traditional modulated model predictive control (M2PC), an innovative M2PC based on quantitative neutral point voltage balance (QV-M2PC) is ...
详细信息
Grid-following voltage source converter(GFLVSC)and grid-forming voltage source converter(GFM-VSC)have different dynamic characteristics for active power-frequency and reactive power-voltage supports of the power *** p...
详细信息
Grid-following voltage source converter(GFLVSC)and grid-forming voltage source converter(GFM-VSC)have different dynamic characteristics for active power-frequency and reactive power-voltage supports of the power *** paper aims to clarify and recognize the difference between gridfollowing(GFL)and grid-forming(GFM)frequency-voltage support more intuitively and ***,the phasor model considering circuit constraints is established based on the port circuit equations of the *** is revealed that the voltage and active power linearly correspond to the horizontal and vertical axes in the phasor space referenced to the grid voltage ***,based on topological homology,GFL and GFM controls are transformed and mapped into different *** topological similarity of the characteristic curves for GFL and GFM controls is the essential cause of their *** on the above model,it is indicated that GFL-VSC and GFM-VSC possess uniformity with regard to active power response,type of coupling,and phasor *** differ in synchronization,power coupling mechanisms,dynamics,and active power-voltage operation domain in the quasi-steady *** studies are undertaken on GFL-VSC and GFM-VSC integrated into a four-machine two-area *** results verify that the dynamic uniformity and difference of GFL-VSC and GFM-VSC are intuitively and comprehensively revealed.
Precise transverse emittance assessment in electron beams is crucial for advancing high-brightness beam *** opposed to intricate methodologies that use specialized devices,quadrupole focusing strength scanning(Q-scann...
详细信息
Precise transverse emittance assessment in electron beams is crucial for advancing high-brightness beam *** opposed to intricate methodologies that use specialized devices,quadrupole focusing strength scanning(Q-scanning)techniques offer notable advantages for various injectors owing to their inherent convenience and ***,their stringent approximation conditions lead to inevitable errors in practical operation,thereby limiting their widespread *** study addressed these challenges by revisiting the analytical derivation procedure and investigating the effects of the underlying approximation *** corrections were explored through a combination of data processing analysis and numerical ***,based on theoretical derivations,virtual measurements using beam dynamics calculations were employed to evaluate the correction *** experimental validations were performed at the Huazhong University of Science and technology injector to verify the effectiveness of the proposed compensation *** the virtual and experimental results confirm the feasibility and reliability of the enhanced Q-scanning-based diagnosis for transverse emittance in typical beam injectors operating under common *** the integration of these corrections and compensations,enhanced Q-scanning-based techniques emerge as promising alternatives to traditional emittance diagnosis methods.
In this paper, a novel self-updating incremental model based predictive current control strategy is proposed for permanent-magnet synchronous motor (PMSM) drive, which improves the parameter robustness and current per...
详细信息
In this paper, an integrated active disturbance rejection control (ADRC) strategy with fractional-order vector resonant (FOVR) control is proposed to enhance the current performance of permanent-magnet synchronous mot...
详细信息
This paper presents a novel method for energy modulation simultaneous wireless power and data transfer (EM-SWPDT) by partial current modulation. The system model is built in MATLAB/Simulink to verify the proposed modu...
详细信息
This paper proposes a dc-link voltage control (DVC) strategy without communication between primary and secondary sides for a series-parallel wireless motor (SPWM) system. Communication devices, such as Bluetooth, can ...
详细信息
To further enhance the performance of space vector pulse width modulation (SVPWM), a novel flexible vector distribution strategy is proposed for three-phase current ripple reduction. In this strategy, a new voltage ve...
详细信息
Base station(BS)backup batteries(BSBBs),with their dispatchable capacity,are potential demand-side resources for future power *** enhance the power supply reliability and post-contingency frequency security of power s...
详细信息
Base station(BS)backup batteries(BSBBs),with their dispatchable capacity,are potential demand-side resources for future power *** enhance the power supply reliability and post-contingency frequency security of power systems,we propose a two-stage stochastic unit commitment(UC)model incorporating operational reserve and post-contingency frequency support provisions from massive BSBBs in cellular networks,in which the minimum backup energy demand is considered to ensure BS power supply *** energy,operational reserve,and frequency support ancillary services are co-optimized to handle the power balance and post-contingency frequency security in both forecasted and stochastic variable renewable energy(VRE)***,we propose a dedicated and scalable distributed optimization framework to enable autonomous optimizations for both dispatching center(DC)and *** BS model parameters are stored and processed locally,while only the values of BS decision variables are required to upload to DC under the proposed distributed optimization framework,which safeguards BS privacy *** studies on a modified IEEE 14-bus system demonstrate the effectiveness of the proposed method in promoting VRE accommodation,ensuring post-contingency frequency security,enhancing operational economics,and fully utilizing BSBBs'energy and power ***,the proposed distributed optimization framework has been validated to converge to a feasible solution with near-optimal performance within limited ***,numerical results on the Guangdong 500 kV provincial power system in China verify the scalability and practicality of the proposed distributed optimization framework.
With the advantages of low raw material cost and 100%atom utilization,the synthesis of high value-added chemical product cyclic carbonates by the cycloaddition of CO_(2)to epoxides has become one of the most prospecti...
详细信息
With the advantages of low raw material cost and 100%atom utilization,the synthesis of high value-added chemical product cyclic carbonates by the cycloaddition of CO_(2)to epoxides has become one of the most prospective approaches to achieve the industrial utilization of CO_(2).In the reported catalytic systems,the complexity of the catalyst synthesis process,high cost,separation difficulties,and low CO_(2)capture limit the catalytic efficiency and its large-scale *** this paper,Ag nanoparticles loaded on polyethyleneimine(PEI)-modified UiO-66-NH_(2)(Ag/PEI@UiO-66-NH_(2))are successfully synthesized by in situ immersion *** Ag nanoparticles and the amino groups on the surfaces of PEI@UiO-66-NH_(2)contribute to the adsorption of CO_(2)and polarization of C–O bonds in epoxides,thereby boosting the conversion capability for the CO_(2)cycloaddition *** the amount of propylene oxide of 0.25 mol and the catalyst dosage of 1%of the substrate,the yield and selectivity of propylene carbonate are up to 99%.In addition,the stability and recyclability of Ag/PEI@UiO-66-NH_(2)catalyst are *** Ag/PEI@UiO-66-NH_(2)catalyst also demonstrates a wide range of activity and distinctive selectivity toward cyclo-carbonates in the cycloaddition of CO_(2)to *** work provides a guide to designing a highly efficient catalyst for in situ capture and high-value utilization of CO_(2)in industrial applications.
暂无评论