In the past ten years the eomplementary tristimulus speetrophotometryll],eTs,has seen its diverse appli-eations{2一61 though most researehes remain in relatively simpe systems,and less work has been involvinkinetie re...In the past ten years the eomplementary tristimulus speetrophotometryll],eTs,has seen its diverse appli-eations{2一61 though most researehes remain in relatively simpe systems,and less work has been involvinkinetie reaetions. An attemPt has been made on the investigation of some comPlieated systems eontainingrare earths and meta一acetylchloroPhosPhonaz展开更多
In order to achieve rapid and simple non-destructive testing of water trees in materials,a novel water tree characterisation method based on the complementary split ring reso-nators(CSRR)was proposed.The characteristi...In order to achieve rapid and simple non-destructive testing of water trees in materials,a novel water tree characterisation method based on the complementary split ring reso-nators(CSRR)was proposed.The characteristics of circular CSRR and rectangular CSRR were analysed in high-frequency electromagnetic simulation software.The resonant fre-quency of CSRR was found to be correlated to the dielectric constant of the materials.In addition,the lumped equivalent circuit parameters of CSRRs were also calculated and simulated.The results of electromagnetic simulations and circuit simulations achieved good consistency.In the experimental part,sensors based on the two kinds of CSRRs were fabricated and were used to detect the water tree defects in low-density polyethylene samples.The experiment results showed that the method of using CSRR sensors to detect water tree is feasible.展开更多
针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high ...针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high gain observer,RHGO)的新型终端互补滑模控制(novel terminal complementary sliding mode control,NTCSMC)策略。首先,在观测器中引入高增益系数来抑制瞬态振荡,并通过降阶设计对观测器结构进行简化;其次,在终端互补滑模面上引入控制系数,增强了被控系统的稳定性,并设计超螺旋切换律来抑制抖振;然后,从理论上证明RHGO和NTCSMC的稳定性;最后在MATLAB仿真和实验平台上,分别对比例积分(proportional integral,PI)控制、基于传统扩张状态观测器-滑模控制(extended state observer-sliding mode control,ESO-SMC)与改进ESO-SMC控制方法进行仿真及实验验证。结果表明,所提控制方法在构网型光伏并网储能系统的暂态性能方面具有良好的效果。展开更多
文摘In the past ten years the eomplementary tristimulus speetrophotometryll],eTs,has seen its diverse appli-eations{2一61 though most researehes remain in relatively simpe systems,and less work has been involvinkinetie reaetions. An attemPt has been made on the investigation of some comPlieated systems eontainingrare earths and meta一acetylchloroPhosPhonaz
基金National Natural Science Foundation of China,Grant/Award Number:51877146。
文摘In order to achieve rapid and simple non-destructive testing of water trees in materials,a novel water tree characterisation method based on the complementary split ring reso-nators(CSRR)was proposed.The characteristics of circular CSRR and rectangular CSRR were analysed in high-frequency electromagnetic simulation software.The resonant fre-quency of CSRR was found to be correlated to the dielectric constant of the materials.In addition,the lumped equivalent circuit parameters of CSRRs were also calculated and simulated.The results of electromagnetic simulations and circuit simulations achieved good consistency.In the experimental part,sensors based on the two kinds of CSRRs were fabricated and were used to detect the water tree defects in low-density polyethylene samples.The experiment results showed that the method of using CSRR sensors to detect water tree is feasible.
文摘针对新能源设备功率变化会引起直流母线电压波动,且在电网频率波动较大的弱电网环境下,有功功率可能会产生功率振荡,从而使构网型光储系统暂态性能变差的问题,采用虚拟同步发电机技术,提出一种基于降阶高增益观测器(reduced-order high gain observer,RHGO)的新型终端互补滑模控制(novel terminal complementary sliding mode control,NTCSMC)策略。首先,在观测器中引入高增益系数来抑制瞬态振荡,并通过降阶设计对观测器结构进行简化;其次,在终端互补滑模面上引入控制系数,增强了被控系统的稳定性,并设计超螺旋切换律来抑制抖振;然后,从理论上证明RHGO和NTCSMC的稳定性;最后在MATLAB仿真和实验平台上,分别对比例积分(proportional integral,PI)控制、基于传统扩张状态观测器-滑模控制(extended state observer-sliding mode control,ESO-SMC)与改进ESO-SMC控制方法进行仿真及实验验证。结果表明,所提控制方法在构网型光伏并网储能系统的暂态性能方面具有良好的效果。
