柔性多状态开关(SOP)作为一种多功能性的新型电力电子装置,既能够优化配电网中的潮流,又能够优化电压分布。文中先推导了SOP的数学模型,针对多端口SOP传统PI双环控制的PI参数较多,且整定比较困难的缺点,利用无差拍控制设计电流内环,从...柔性多状态开关(SOP)作为一种多功能性的新型电力电子装置,既能够优化配电网中的潮流,又能够优化电压分布。文中先推导了SOP的数学模型,针对多端口SOP传统PI双环控制的PI参数较多,且整定比较困难的缺点,利用无差拍控制设计电流内环,从而减少PI控制器的数量,简化控制电路的设计。针对无差拍控制对滤波电感较为敏感,抗电感参数摄动能力差的缺点,加入参数辨识环节,对系统参数进行跟踪估计,提高无差拍控制的鲁棒性。然后就基于参数辨识的无差拍控制对各端口的U dc Q、PQ以及U ac f控制模式进行算法实现。通过在MATLAB/Simulink中进行仿真实验,验证了所提控制算法的可行性。展开更多
为抑制系统干扰对柔性多状态开关(flexiblemulti-stateswitch,FMSS)直流电压的影响,提出了一种基于改进型线性扩张状态观测器(linear extended state observer,LESO)的FMSS直流电压控制策略。首先,根据直流电压动态方程和系统变量间的...为抑制系统干扰对柔性多状态开关(flexiblemulti-stateswitch,FMSS)直流电压的影响,提出了一种基于改进型线性扩张状态观测器(linear extended state observer,LESO)的FMSS直流电压控制策略。首先,根据直流电压动态方程和系统变量间的非线性关系设计了直流电压控制外环;然后,采用将干扰观测值前馈的干扰抑制方案,通过选取新的误差函数和状态变量提出了一种用于干扰观测的改进型LESO;最后,根据直流电压响应函数设计了干扰前馈环节。仿真结果表明,在干扰下FMSS直流电压波动比采用经典LESO时减小50%,同时直流电压恢复稳定的时间缩短13%,端口输出有功超调减小42%。因此所提策略能够有效抑制系统干扰对FMSS直流电压的影响。展开更多
To explore the application of the characteristics of metallic microparticles, alternating current electric trapping of the SU-8 microrods coated with a thin gold layer by the chemical approach is investigated. Positiv...To explore the application of the characteristics of metallic microparticles, alternating current electric trapping of the SU-8 microrods coated with a thin gold layer by the chemical approach is investigated. Positive dielectrophoresis is used to absorb the gold-coated SU-8 microrods at the edge of the parallel electrodes, thereby forming chains to connect the electrodes. This is a fast automatic microcircuit formation process. Moreover, a non-charged molecule is modified on the surface of the gold-coated SU-8 microrod, and the modified microrods are controlled by the alternating electric field to form a number of chains. The different chains between the parallel electrodes consist of various parallel circuits. In order to compare these chains with different electric surfaces, the impedances of the metallic and modified microrods are measured and compared, and the results show that the gold-coated microrods act as pure resistors, while the microrods functionalized by a non-charged molecule behave as good capacitors.展开更多
文摘柔性多状态开关(SOP)作为一种多功能性的新型电力电子装置,既能够优化配电网中的潮流,又能够优化电压分布。文中先推导了SOP的数学模型,针对多端口SOP传统PI双环控制的PI参数较多,且整定比较困难的缺点,利用无差拍控制设计电流内环,从而减少PI控制器的数量,简化控制电路的设计。针对无差拍控制对滤波电感较为敏感,抗电感参数摄动能力差的缺点,加入参数辨识环节,对系统参数进行跟踪估计,提高无差拍控制的鲁棒性。然后就基于参数辨识的无差拍控制对各端口的U dc Q、PQ以及U ac f控制模式进行算法实现。通过在MATLAB/Simulink中进行仿真实验,验证了所提控制算法的可行性。
文摘为抑制系统干扰对柔性多状态开关(flexiblemulti-stateswitch,FMSS)直流电压的影响,提出了一种基于改进型线性扩张状态观测器(linear extended state observer,LESO)的FMSS直流电压控制策略。首先,根据直流电压动态方程和系统变量间的非线性关系设计了直流电压控制外环;然后,采用将干扰观测值前馈的干扰抑制方案,通过选取新的误差函数和状态变量提出了一种用于干扰观测的改进型LESO;最后,根据直流电压响应函数设计了干扰前馈环节。仿真结果表明,在干扰下FMSS直流电压波动比采用经典LESO时减小50%,同时直流电压恢复稳定的时间缩短13%,端口输出有功超调减小42%。因此所提策略能够有效抑制系统干扰对FMSS直流电压的影响。
基金supported by the National Natural Science Foundation of China(Grant No.51075087)the Funds from the State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University,China(Grant Nos.GZKF-201107 and GZKF-201004)the Foundation from the China Scholarship Council(Grant No.2009612129)
文摘To explore the application of the characteristics of metallic microparticles, alternating current electric trapping of the SU-8 microrods coated with a thin gold layer by the chemical approach is investigated. Positive dielectrophoresis is used to absorb the gold-coated SU-8 microrods at the edge of the parallel electrodes, thereby forming chains to connect the electrodes. This is a fast automatic microcircuit formation process. Moreover, a non-charged molecule is modified on the surface of the gold-coated SU-8 microrod, and the modified microrods are controlled by the alternating electric field to form a number of chains. The different chains between the parallel electrodes consist of various parallel circuits. In order to compare these chains with different electric surfaces, the impedances of the metallic and modified microrods are measured and compared, and the results show that the gold-coated microrods act as pure resistors, while the microrods functionalized by a non-charged molecule behave as good capacitors.
