In a cyber-physical micro-grid system,wherein the control functions are executed through open communication channel,stability is an important issue owing to the factors related to the time-delay encountered in the dat...In a cyber-physical micro-grid system,wherein the control functions are executed through open communication channel,stability is an important issue owing to the factors related to the time-delay encountered in the data transfer.Transfer of feedback variable as discrete data packets in communication network invariably introduces inevitable time-delays in closed loop control systems.This delay,depending upon the network traffic condition,inherits a time-varying characteristic;nevertheless,it adversely impacts the system performance and stability.The load perturbations in a micro-grid system are considerably influenced by the presence of fluctuating power generators like wind and solar power.Since these non-conventional energy sources are integrated into the power grid through power electronic interface circuits that usually works at high switching frequency,noise signals are introduced into the micro-grid system and these signals gets super-imposed to the load variations.Based on this back ground,in this paper,the delay-dependent stability issue of networked micro-grid system combined with time-varying feedback loop delay and uncertain load perturbations is investigated,and a deeper insight has been presented to infer the impact of time-delay on the variations in the system frequency.The classical Lyapunov-Krasovskii method is employed to address the problem,and using a standard benchmark micro-grid system,and the proposed stability criterion is validated.展开更多
1.Background of the open science movement Science is characterized by the demand for open communication within a community.In the early days,members of the scientific community exchanged their academic results through...1.Background of the open science movement Science is characterized by the demand for open communication within a community.In the early days,members of the scientific community exchanged their academic results through correspondence,and they later established academic organizations to organize academic conferences,and to publish academic journals to strengthen communication.展开更多
This study introduces a nonlinear error-compensated air-displacement pipettor(NEC_ADP),a novel system that addresses the key limitations in commercial pipetting setups.By incorporating nonlinear error-compensation(NEC...This study introduces a nonlinear error-compensated air-displacement pipettor(NEC_ADP),a novel system that addresses the key limitations in commercial pipetting setups.By incorporating nonlinear error-compensation(NEC)technology,the NEC_ADP improves the accuracy and precision of liquid handling across a wide range of volumes,from micro-volumes(1μL)to macro-volumes(up to 1000μL),and for reagents with varying viscosities and surface tensions.Unlike conventional pipettors,which rely on linear compensation or manual recalibration,NEC_ADP features real-time,online calibration,eliminating the need for factory recalibration and reducing maintenance costs.The system was built with a modular design,allowing seamless scalability from single-to multi-channel configurations.It integrates effortlessly with existing laboratory systems using the open platform communications unified architecture(OPC UA),enhancing interoperability and automation.In addition,the use of machine-learning algorithms for motion control and trajectory planning ensures optimal pipetting strategies and automatic adaptation to different reagents and volumes.This study demonstrates the superior performance of NEC_ADP compared to commercial systems,including the TECAN Cavro®and Eppendorf epMotion®,with significant improvements in accuracy and precision.Innovation in NEC_ADP technology and system integration marks a significant advancement in automated liquid handling,offering robust support for highprecision applications in fields such as genomics,stemcell research,and synthetic biology.展开更多
文摘In a cyber-physical micro-grid system,wherein the control functions are executed through open communication channel,stability is an important issue owing to the factors related to the time-delay encountered in the data transfer.Transfer of feedback variable as discrete data packets in communication network invariably introduces inevitable time-delays in closed loop control systems.This delay,depending upon the network traffic condition,inherits a time-varying characteristic;nevertheless,it adversely impacts the system performance and stability.The load perturbations in a micro-grid system are considerably influenced by the presence of fluctuating power generators like wind and solar power.Since these non-conventional energy sources are integrated into the power grid through power electronic interface circuits that usually works at high switching frequency,noise signals are introduced into the micro-grid system and these signals gets super-imposed to the load variations.Based on this back ground,in this paper,the delay-dependent stability issue of networked micro-grid system combined with time-varying feedback loop delay and uncertain load perturbations is investigated,and a deeper insight has been presented to infer the impact of time-delay on the variations in the system frequency.The classical Lyapunov-Krasovskii method is employed to address the problem,and using a standard benchmark micro-grid system,and the proposed stability criterion is validated.
文摘1.Background of the open science movement Science is characterized by the demand for open communication within a community.In the early days,members of the scientific community exchanged their academic results through correspondence,and they later established academic organizations to organize academic conferences,and to publish academic journals to strengthen communication.
基金supported in part by the National Key R&D Program of China[Grant No.2023YFF0724200]Strategic Priority Research Program of the Chinese Academy of Sciences[Grant No.XDB1250000]+5 种基金Key Research and Development Program of Guangzhou City[Grant No.2024B03J0002,2025B03J0095]in part by the Guangzhou Koalson Smart Manufacturing Technology Co.,Ltd.,Scientific Instrumentation Development Program of Chinese Academy of Sciences[Grant No.PTYQ2024TD0002,ZDKYYQ20210006]Key Research Program of Chinese Academy of Sciences[Grant No.ZDBS-ZRKJZ-TLC006]Guangzhou Basic and Applied Basic Research Project[Grant No.2024A04J6352,2022A1515110435]Human Cell Lineage Atlas Facility[Grant No.DSS05010101]Basic Research Project of Guangzhou Institutes of Biomedicine and Health,Chinese Academy of Sciences[No.GIBHBRP24-03].
文摘This study introduces a nonlinear error-compensated air-displacement pipettor(NEC_ADP),a novel system that addresses the key limitations in commercial pipetting setups.By incorporating nonlinear error-compensation(NEC)technology,the NEC_ADP improves the accuracy and precision of liquid handling across a wide range of volumes,from micro-volumes(1μL)to macro-volumes(up to 1000μL),and for reagents with varying viscosities and surface tensions.Unlike conventional pipettors,which rely on linear compensation or manual recalibration,NEC_ADP features real-time,online calibration,eliminating the need for factory recalibration and reducing maintenance costs.The system was built with a modular design,allowing seamless scalability from single-to multi-channel configurations.It integrates effortlessly with existing laboratory systems using the open platform communications unified architecture(OPC UA),enhancing interoperability and automation.In addition,the use of machine-learning algorithms for motion control and trajectory planning ensures optimal pipetting strategies and automatic adaptation to different reagents and volumes.This study demonstrates the superior performance of NEC_ADP compared to commercial systems,including the TECAN Cavro®and Eppendorf epMotion®,with significant improvements in accuracy and precision.Innovation in NEC_ADP technology and system integration marks a significant advancement in automated liquid handling,offering robust support for highprecision applications in fields such as genomics,stemcell research,and synthetic biology.
