To handle input and output time delays that commonly exist in many networked control systems(NCSs), a new robust continuous sliding mode control(CSMC) scheme is proposed for the output tracking in uncertain single inp...To handle input and output time delays that commonly exist in many networked control systems(NCSs), a new robust continuous sliding mode control(CSMC) scheme is proposed for the output tracking in uncertain single input-single-output(SISO) networked control systems. This scheme consists of three consecutive steps. First, although the network-induced delay in those systems can be effectively handled by using Pade approximation(PA), the unmatched disturbance cames out as another difficulty in the control design. Second, to actively estimate this unmatched disturbance, a generalized proportional integral observer(GPIO) technique is utilized based on only one measured state. Third, by constructing a new sliding manifold with the aid of the estimated unmatched disturbance and states, a GPIO-based CSMC is synthesized, which is employed to cope with not only matched and unmatched disturbances, but also networkinduced delays. The stability of the entire closed-loop system under the proposed GPIO-based CSMC is detailedly analyzed.The promising tracking efficiency and feasibility of the proposed control methodology are verified through simulations and experiments on Quanser's servo module for motion control under various test conditions.展开更多
A simple method is proposed to optimize the thickness parameter of the boundary layer of the saturation function in the Complementary Sliding Mode Control (CSMC). A pair of complementary sliding surfaces are construct...A simple method is proposed to optimize the thickness parameter of the boundary layer of the saturation function in the Complementary Sliding Mode Control (CSMC). A pair of complementary sliding surfaces are constructed. And the Taylor series is used to estimate the steady state error of CSMC system to optimize the parameter value for the boundary layer of the saturation function without artificial settings. This proposed CSMC strategy is applied to the speed regulation in permanent magnet synchronous motor with lump uncertainties. The experimental results show that the proposed CSMC strategy can obtain an optimal value for the boundary layer parameter effectively suppressing the chattering and keep an excellent system performance.展开更多
To ensure the safe and stable operation of superconducting magnets in fusion devices under high current and complex operating conditions,a highly reliable quench detection system was developed for the Central Solenoid...To ensure the safe and stable operation of superconducting magnets in fusion devices under high current and complex operating conditions,a highly reliable quench detection system was developed for the Central Solenoid Model Coil(CSMC)of the Chinese Fusion Engineering Testing Reactor(CFETR).The system adopts voltage-based detection as the primary criterion and implements a primary induced voltage compensation architecture based on Co-Wound Wire(CWW)and Co-Wound Tape(CWT)techniques.In addition,a secondary compensation algorithm is introduced to effectively suppress the risk of misjudgment caused by electromagnetic coupling.In the system design,a multi-redundant compensation scheme was proposed with full consideration of the magnet structure and cabling constraints.During the engineering commissioning phase,both room-temperature continuity tests and low-current compensation coefficient calibration were conducted.Induced voltage suppression tests under different current variation rates demonstrated that CWT provides superior compensation performance compared to CWW,with induced voltage suppression rates exceeding 99.8%for CWW and 99.95%for CWT.Furthermore,reliability tests under three simulated fault scenarios confirmed that the diagnostic system could accurately identify system states without false triggers,showing strong anti-interference capability and engineering stability.Ultimately,the system was successfully deployed in a high-current energization test of the CSMC,operating at up to 48kA.It maintained stable performance throughout the test without any false alarms or missed detections,verifying its feasibility and reliability under real engineering conditions.The quench detection compensation methods and system architecture proposed in this study provide a solid technical foundation and practical support for the future development and deployment of the CFETR Central Solenoid superconducting magnet quench detection system.展开更多
基金supported in part by the Australian Research Council Discovery Project(DP190101557)
文摘To handle input and output time delays that commonly exist in many networked control systems(NCSs), a new robust continuous sliding mode control(CSMC) scheme is proposed for the output tracking in uncertain single input-single-output(SISO) networked control systems. This scheme consists of three consecutive steps. First, although the network-induced delay in those systems can be effectively handled by using Pade approximation(PA), the unmatched disturbance cames out as another difficulty in the control design. Second, to actively estimate this unmatched disturbance, a generalized proportional integral observer(GPIO) technique is utilized based on only one measured state. Third, by constructing a new sliding manifold with the aid of the estimated unmatched disturbance and states, a GPIO-based CSMC is synthesized, which is employed to cope with not only matched and unmatched disturbances, but also networkinduced delays. The stability of the entire closed-loop system under the proposed GPIO-based CSMC is detailedly analyzed.The promising tracking efficiency and feasibility of the proposed control methodology are verified through simulations and experiments on Quanser's servo module for motion control under various test conditions.
基金Sponsored by the National Natural Science Foundation of China(Grant No.61174051)the Natural Science Foundation of Fujian Province(Grant No.2017J05101)the Technology Project of Fujian Province(Grant No.2019H0007)
文摘A simple method is proposed to optimize the thickness parameter of the boundary layer of the saturation function in the Complementary Sliding Mode Control (CSMC). A pair of complementary sliding surfaces are constructed. And the Taylor series is used to estimate the steady state error of CSMC system to optimize the parameter value for the boundary layer of the saturation function without artificial settings. This proposed CSMC strategy is applied to the speed regulation in permanent magnet synchronous motor with lump uncertainties. The experimental results show that the proposed CSMC strategy can obtain an optimal value for the boundary layer parameter effectively suppressing the chattering and keep an excellent system performance.
基金supported by Comprehensive Research Facility for Fusion Technology Program of China under Contract No.2018-000052-73-01-001228。
文摘To ensure the safe and stable operation of superconducting magnets in fusion devices under high current and complex operating conditions,a highly reliable quench detection system was developed for the Central Solenoid Model Coil(CSMC)of the Chinese Fusion Engineering Testing Reactor(CFETR).The system adopts voltage-based detection as the primary criterion and implements a primary induced voltage compensation architecture based on Co-Wound Wire(CWW)and Co-Wound Tape(CWT)techniques.In addition,a secondary compensation algorithm is introduced to effectively suppress the risk of misjudgment caused by electromagnetic coupling.In the system design,a multi-redundant compensation scheme was proposed with full consideration of the magnet structure and cabling constraints.During the engineering commissioning phase,both room-temperature continuity tests and low-current compensation coefficient calibration were conducted.Induced voltage suppression tests under different current variation rates demonstrated that CWT provides superior compensation performance compared to CWW,with induced voltage suppression rates exceeding 99.8%for CWW and 99.95%for CWT.Furthermore,reliability tests under three simulated fault scenarios confirmed that the diagnostic system could accurately identify system states without false triggers,showing strong anti-interference capability and engineering stability.Ultimately,the system was successfully deployed in a high-current energization test of the CSMC,operating at up to 48kA.It maintained stable performance throughout the test without any false alarms or missed detections,verifying its feasibility and reliability under real engineering conditions.The quench detection compensation methods and system architecture proposed in this study provide a solid technical foundation and practical support for the future development and deployment of the CFETR Central Solenoid superconducting magnet quench detection system.
