In this paper, we conduct research on the current condition and countermeasures of private colleges and universities student physique health test under background of sunshine sports. For the further reform of basic ed...In this paper, we conduct research on the current condition and countermeasures of private colleges and universities student physique health test under background of sunshine sports. For the further reform of basic education thought and education idea, strengthen quality education, widening specialty caliber, and promote the reform of the teaching and scientific research combined, gradually establish a notice to strengthen quality education, integrating imparting knowledge, cultivating basic ability, improve quality, develop base solid foundation, wide knowledge and strong ability and high quality specialized talented person as has the characteristics of era of diversified and comprehensive compound talents training mode and our country higher professional sports curriculum framework should be organized by the teachers, teaching conditions, teaching management, assessment, teaching reform, the teaching effect on conception to form a multi-level, multi-factor curriculum system. With this guidance, we propose the enhanced student physique health test paradigm for the private colleges and universities student that will be innovative.展开更多
Legal aid, also known as legal relief, is commonly adopted in many countries. In fact, it is an indispensable part of the legal system in a modern society ruled by law. It is an important guarantee for the fairness in...Legal aid, also known as legal relief, is commonly adopted in many countries. In fact, it is an indispensable part of the legal system in a modern society ruled by law. It is an important guarantee for the fairness in the administration of justice and human rights relief. It is also an important mark of political civilization and social progress in a country展开更多
The forces of random wave plus current acting on a simplified offshore platform (jacket) model have been studied numerically and experimentally. The numerical results are in good agreement with experiments. The mean f...The forces of random wave plus current acting on a simplified offshore platform (jacket) model have been studied numerically and experimentally. The numerical results are in good agreement with experiments. The mean force can be approximated as a function of equivalent velocity parameter and the root-mean-square force as a function of equivalent significant wave height parameter.展开更多
为提升综合电能质量调节器(unified power quality conditioner,UPQC)在不同工况下串联侧抗扰动性能,提出一种在abc坐标系下基于电压、电流前馈的复合控制,对传统电网电压前馈进行改进并引入负载电流前馈,以进一步提升控制器动、静态性...为提升综合电能质量调节器(unified power quality conditioner,UPQC)在不同工况下串联侧抗扰动性能,提出一种在abc坐标系下基于电压、电流前馈的复合控制,对传统电网电压前馈进行改进并引入负载电流前馈,以进一步提升控制器动、静态性能。首先,根据UPQC拓扑结构建立串联侧单相数学模型以分析扰动对系统影响;其次,依据数学模型提出改进的复合前馈控制策略;最后,通过实物试验,分别从不同工况验证了该控制策略在UPQC系统中的有效性及优越性。展开更多
This paper proposes about a powerful control mechanism of UPQC (Unified Power Quality Conditioner) work on voltage source inverter which can effectively compensate source current harmonics and also mitigate all voltag...This paper proposes about a powerful control mechanism of UPQC (Unified Power Quality Conditioner) work on voltage source inverter which can effectively compensate source current harmonics and also mitigate all voltage collapse such as dip, swell, voltage unbalances and harmonics. The consolidation of series and parallel active power filters sharing mutual DC bus capacitor forms UPQC. PI (Proportional Integral) controller is mainly used in order to maintain continual DC voltage along with the hysteresis current controller. The parallel and series power filters were designed using 3-phase voltage source inverter. The reference signals for shunt and series active power filters were obtained by Synchronous Reference Frame (SRF) theory and Power Reactive (PQ) theory respectively. By using these theories, reference signals were obtained which was fed to the controllers for generating switching pulses for parallel and series active filters. The UPQC dynamic performance is obtained through testing terms like the compensation of voltage, current harmonics and all voltage distortion associated with 3-phase 3-wire power system which is simulated using MATLAB-Simulink software.展开更多
为解决高速铁路牵引供电系统中的负序、谐波电能质量问题,提出采用铁路功率调节器(railway static power conditioner,RPC)进行负序和谐波电流综合治理。RPC包含共用直流侧电容的背靠背形式的两变流器,控制其功率能够实现负序补偿和谐...为解决高速铁路牵引供电系统中的负序、谐波电能质量问题,提出采用铁路功率调节器(railway static power conditioner,RPC)进行负序和谐波电流综合治理。RPC包含共用直流侧电容的背靠背形式的两变流器,控制其功率能够实现负序补偿和谐波抑制。分析RPC的基本结构和补偿原理后,提出三相V/v变压器下负序和谐波补偿电流检测方法,为保证RPC直流侧电压稳定和实现负序和谐波补偿,提出RPC直流侧电压和两变流器电流控制策略。最后,进行仿真验证。仿真结果表明,在该文提出的负序和谐波检测方法及控制策略下,RPC具有良好的负序和谐波补偿性能。展开更多
在分析单相统一电能质量控制器(unified power quality conditioner,UPQC)瞬时功率平衡关系的基础上,提出一种基于自适应滤波电流检测的UPQC双电流源协调控制策略。鉴于电流检测精度对双电流源控制策略补偿性能的影响,在保留变步长自适...在分析单相统一电能质量控制器(unified power quality conditioner,UPQC)瞬时功率平衡关系的基础上,提出一种基于自适应滤波电流检测的UPQC双电流源协调控制策略。鉴于电流检测精度对双电流源控制策略补偿性能的影响,在保留变步长自适应算法快速性的前提下,提出一种提高电流检测精度的定频率滤波器改进算法。针对双电流源UPQC的控制器设计,采用比例控制和重复控制构成复合控制实现了串、并联有源电力滤波器的电流跟踪控制;从UPQC整体出发建立直流电压闭环控制的小信号模型,为直流电压环的控制器参数设计提供理论指导。研究结果表明,基于该控制策略和控制器设计方案的UPQC系统实现了较好的负载电压和电网电流补偿效果。展开更多
文摘In this paper, we conduct research on the current condition and countermeasures of private colleges and universities student physique health test under background of sunshine sports. For the further reform of basic education thought and education idea, strengthen quality education, widening specialty caliber, and promote the reform of the teaching and scientific research combined, gradually establish a notice to strengthen quality education, integrating imparting knowledge, cultivating basic ability, improve quality, develop base solid foundation, wide knowledge and strong ability and high quality specialized talented person as has the characteristics of era of diversified and comprehensive compound talents training mode and our country higher professional sports curriculum framework should be organized by the teachers, teaching conditions, teaching management, assessment, teaching reform, the teaching effect on conception to form a multi-level, multi-factor curriculum system. With this guidance, we propose the enhanced student physique health test paradigm for the private colleges and universities student that will be innovative.
文摘Legal aid, also known as legal relief, is commonly adopted in many countries. In fact, it is an indispensable part of the legal system in a modern society ruled by law. It is an important guarantee for the fairness in the administration of justice and human rights relief. It is also an important mark of political civilization and social progress in a country
基金This project was financially supported by the Foundation of the Chinese Academy of Sciences and the Foundation of the State Key Ocean Engineering Laboratory,Shanghai Jiaotong University
文摘The forces of random wave plus current acting on a simplified offshore platform (jacket) model have been studied numerically and experimentally. The numerical results are in good agreement with experiments. The mean force can be approximated as a function of equivalent velocity parameter and the root-mean-square force as a function of equivalent significant wave height parameter.
文摘为提升综合电能质量调节器(unified power quality conditioner,UPQC)在不同工况下串联侧抗扰动性能,提出一种在abc坐标系下基于电压、电流前馈的复合控制,对传统电网电压前馈进行改进并引入负载电流前馈,以进一步提升控制器动、静态性能。首先,根据UPQC拓扑结构建立串联侧单相数学模型以分析扰动对系统影响;其次,依据数学模型提出改进的复合前馈控制策略;最后,通过实物试验,分别从不同工况验证了该控制策略在UPQC系统中的有效性及优越性。
文摘This paper proposes about a powerful control mechanism of UPQC (Unified Power Quality Conditioner) work on voltage source inverter which can effectively compensate source current harmonics and also mitigate all voltage collapse such as dip, swell, voltage unbalances and harmonics. The consolidation of series and parallel active power filters sharing mutual DC bus capacitor forms UPQC. PI (Proportional Integral) controller is mainly used in order to maintain continual DC voltage along with the hysteresis current controller. The parallel and series power filters were designed using 3-phase voltage source inverter. The reference signals for shunt and series active power filters were obtained by Synchronous Reference Frame (SRF) theory and Power Reactive (PQ) theory respectively. By using these theories, reference signals were obtained which was fed to the controllers for generating switching pulses for parallel and series active filters. The UPQC dynamic performance is obtained through testing terms like the compensation of voltage, current harmonics and all voltage distortion associated with 3-phase 3-wire power system which is simulated using MATLAB-Simulink software.
文摘为解决高速铁路牵引供电系统中的负序、谐波电能质量问题,提出采用铁路功率调节器(railway static power conditioner,RPC)进行负序和谐波电流综合治理。RPC包含共用直流侧电容的背靠背形式的两变流器,控制其功率能够实现负序补偿和谐波抑制。分析RPC的基本结构和补偿原理后,提出三相V/v变压器下负序和谐波补偿电流检测方法,为保证RPC直流侧电压稳定和实现负序和谐波补偿,提出RPC直流侧电压和两变流器电流控制策略。最后,进行仿真验证。仿真结果表明,在该文提出的负序和谐波检测方法及控制策略下,RPC具有良好的负序和谐波补偿性能。
文摘在分析单相统一电能质量控制器(unified power quality conditioner,UPQC)瞬时功率平衡关系的基础上,提出一种基于自适应滤波电流检测的UPQC双电流源协调控制策略。鉴于电流检测精度对双电流源控制策略补偿性能的影响,在保留变步长自适应算法快速性的前提下,提出一种提高电流检测精度的定频率滤波器改进算法。针对双电流源UPQC的控制器设计,采用比例控制和重复控制构成复合控制实现了串、并联有源电力滤波器的电流跟踪控制;从UPQC整体出发建立直流电压闭环控制的小信号模型,为直流电压环的控制器参数设计提供理论指导。研究结果表明,基于该控制策略和控制器设计方案的UPQC系统实现了较好的负载电压和电网电流补偿效果。
