检索结果-内蒙古大学图书馆

International Conference on Information and Automation (ICIA)

作者： Shaomin Zhang Can Wang Xinyu Wu Yongqiang Liao Pingan Wang Shibo Cai Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Guangdong Provincial Key Laboratory of Robotics and Intelligent System Chinese Academy of Sciences Department of Mechanical and Automation The Chinese University of Hong Kong Ministry of Education & Zhejiang Province Zhejiang University of Technology

In order to help spinal cord injury (SCI) patients to walk again, a medical robot exoskeleton have been developed to assist these patients to walk independently in SIAT, Shenzhen. The robot has an under-drive control structure. The wearer can maintain balance and shift his (her) body weight with the aid of a pair of crutches. On this robot we have implemented a four-legged gait planning method. Through analysis of normal gait, modifications have been made so that the gait of the robot can serve a SCI patient well. A paraplegic patient acted as a volunteer has involved in the experiments. The results of experiments illustrated the effectiveness of the proposed gait planning method.

关键词： Legged locomotion Exoskeletons Joints Hip Robot kinematics Knee

来源：评论

学校读者我要写书评

暂无评论

Consistency analysis of SCADA data from field power systems

Consistency analysis of SCADA data from field power systems

引用

10th International Conference on Advances in Power system control, Operation & Management (APSCOM 2015)

作者： Yaping Zhang Hengxu Zhang Liang Wang Guangsong Hou Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education School of Electrical Engineering Shandong University Jinan China Dispatch and Control Center of Shandong Electric Power Corporation Jinan China Heze Power Supply Company of State Grid Shandong Electric Power Corporation China

ISBN: (纸本)9781510830059

SCADA (Supervisory control And Data Acquisition) system is a basic infrastructure of modern power systems. SCADA data are widely used in applications such as state estimation, power flow calculation, and on-line security assessment. The accuracy of the SCADA data directly affects the implementation of power system automatic control. In practice, the error of the SCADA data may deviate from its factory precision due to the influence of the equipment aging, data transmission and so on. To quantitatively evaluate the validity of the SCADA data, a consistency index is defined in this paper. Some SCADA data from several substations of a power gird is checked with the consistency index to reveal its reliability.

关键词： consistency power systems SCADA error analysis

来源：评论

学校读者我要写书评

暂无评论

Detecting the Position of the Moving-iron Solenoid by Non-displacement Sensor Based on Parameter Identification of Flux Linkage Characteristics

引用

Chinese Journal of Mechanical Engineering 2013年第6期26卷 1204-1211页

作者： WANG Xuping QUAN Long XIONG Guangyu Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology

Currently, most researches use signals, such as the coil current or voltage of solenoid, to identify parameters; typically, parameter identification method based on variation rate of coil current is applied for position estimation. The problem exists in these researches that the detected signals are prone to interference and difficult to obtain. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which adds a new group of secondary winding to the coil of the ordinary switching electromagnet. On the basis of electromagnetic coupling theory analysis and simulation research of the magnetic field regarding the primary and secondary winding coils, and in accordance with the fact that under PWM control mode varying core position and operating current of windings produce different characteristic of flux increment of the secondary winding. The flux increment of the electromagnet winding can be obtained by conducting time domain integration for the induced voltage signal of the extracted secondary winding, and the core position from the two-dimensional fitting curve of the operating winding current and flux-linkage characteristic quantity of solenoid are calculated. The detecting and testing system of solenoid core position is developed based on the theoretical research. The testing results show that the flux characteristic quantity of switching electromagnet magnetic circuit is able to effectively show the core position and thus to accomplish the non-displacement transducer detection of the said core position of the switching electromagnet. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which provides a new theory and method for switch solenoid to control the proportional valve.

关键词： switch solenoid flux characteristic quantity position detection non-displacement sensor

来源：评论

学校读者我要写书评

暂无评论

Parameters-setting Method for Synchronization of Pumped Storage Units under Pumping Condition

Parameters-setting Method for Synchronization of Pumped Stor...

引用

International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

作者： Zhiming Zhang Wei Cong Fei Wang Guowen Hao Jianguang Li Yanping Yang Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education Jinan Shandong Province China

ISBN: (纸本)9781467371070

This paper presents a parameters-setting method for the synchronization of pumped-storage units under the pumping condition. The synchronizing process of the units is analyzed and the synchronizing parameters-setting principle of generating units is referred. Finally, the method is educed through mathematical formula derivation. Under the pumping condition, the setting value of the closing pulse leading time and the synchronizing process are both different from those of the generating condition, so the changes of voltage and frequency of pumping condition during closing pulse leading time are deduced. Then, the setting method of the allowable voltage difference, frequency difference and closing angular phase difference could be obtained. The parameters-setting method in this paper provides the theoretical foundation for synchronizing parameters setting of pumped storage unit. It is significant for decreasing the synchronizing impact current and heightening success rate of synchronization.

关键词： pumped storage pumping condition qua-si-synchronization synchronizing parameters

来源：评论

学校读者我要写书评

暂无评论

Shared control for teleoperation enhanced by autonomous obstacle avoidance of robot manipulator

Shared control for teleoperation enhanced by autonomous obst...

引用

IEEE/RSJ International Conference on intelligent Robots and systems

作者： Xinyu Wang Chenguang Yang Hongbin Ma Long Cheng Centre for Robotics and Neural Systems Plymouth University Plymouth UK State Key Lab of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing China Ministry of Education South China University of Technology Guangzhou China State Key Laboratory of Management and Control for Complex Systems Chinese Academy of Sciences Beijing China

In this paper, a human robot shared control strategy is developed and tested on a Baxter robot. Using the proposed method, the human operator only needs to consider the motion of the end-effector of the manipulator, while the manipulator will avoid obstacle by itself without sacrificing the end effector motion performance. An improved obstacle avoidance strategy based on the joint space redundancy of the manipulator is designed. A dimension reduction method is presented to solve the over defined problem of avoiding velocity to achieve a more efficient use of the redundancy. By employment of an artificial parallel system of the teleoperate manipulator and the task switching weighting factor, the proposed control method enable the robot restoring back to the commanded pose smoothly when the obstacle is removed. By implementing the dimension reduction method, the trajectory of each joint of the manipulator can be controlled at the same time to achieve the restoring task. Thus, the proposed control method can eliminate the impact of the obstacle on the remaining task. Satisfactory experiment results demonstrate the effectiveness of the proposed methods.

关键词： Manipulators Collision avoidance Robot kinematics Trajectory Kinematics Robot sensing systems

来源：评论

学校读者我要写书评

暂无评论

Short-circuit Field Tests of Shandong Rongcheng Wind Farms and Measured Data Analysis

Short-circuit Field Tests of Shandong Rongcheng Wind Farms a...

引用

International Conference on Fuzzy systems and Knowledge Discovery

作者： Chunyi Wang Xiuqing Yi Zenggong Cao Hong Mu Hongtao Wang State Grid Shandong Electric Power Company Institute of Technology Shandong University of Traditional Chinese Medicine Jinan Shandong Province China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 Shandong Province China

ISBN: (纸本)9781467376839

In order to verify the short-circuit current characteristics of wind farms and the effects on power grids due to the large scale wind farms integration at Rongcheng substation, Shandong Electric Power Company organized the three phase and single phase short circuit tests on Jun 12~(th), 2014. By using the field tests data got from the digital fault recorder, the short-circuit current characteristics of different types of wind turbines are compared. The wind turbine's contributions of the Squirrel Cage Induction Generator (SCIG), Doubly Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) to the system short-circuit current are analyzed in detail. In addition, the short-circuit current characteristics of wind farms are summarized and deeply understood from the field tests data. With the analysis results, the Shandong Rongcheng wind farms short-circuit field tests will have a very good reference and directive significance to the large scale wind power centralized integration of the actual power grids.

关键词： wind turbine wind farm short-circuit tests short-circuit current characteristics

来源：评论

学校读者我要写书评

暂无评论

Design and Implementation of the Knowledge Base for Battlefield Task Management system 33

Design and Implementation of the Knowledge Base for Battlefi...

引用

第三十三届中国控制会议

作者： Zhang Jia Wang Xiang School of Automation Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision (Beijing Institute of Technology) Ministry of Education

ISBN: (纸本)9781479947249

In order to reduce the operators on the battlefield, and obtain adequate knowledge and improve reaction speed to enhance combat efficiency, the paper builds a knowledge base of battlefield mission management system to manage a variety of required knowledge on the battlefield and supervise each mission profile. Knowledge is presented by production method and is reasoned by forward reasoning method. According to different levels of battlefield tasks, task links are used to organize knowledge. Take combat preparation mission profile as an example, we design every data sheet of the knowledge base. The knowledge base of the battlefield management system could enhance the reusability, sharing and timeliness of knowledge on the battlefield.

关键词： Battlefield Task Management Knowledge Base Task Links Mission Profile

来源：评论

学校读者我要写书评

暂无评论

The Impact of Dynamic Behaviors of Distributed Grid-connected Photovoltaic system on Distribution Network Transient Voltage Stability

The Impact of Dynamic Behaviors of Distributed Grid-connecte...

引用

International Conference on Electric Utility Deregulation and Restructuring and Power Technologies

作者： Liuhan Huang Wen Zhang Hao Yang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan P. R. China

ISBN: (纸本)9781467371070

Due to the increasing capacity of grid-connected photovoltaic systems in distribution networks, its impact on the voltage security can't be ignored. In this paper, based on the voltage stability criterion of maximum transmission power, and considering induction motor voltage response characteristic, the impact of dynamic behaviors of grid-connected photovoltaic systems on transient voltage stability is investigated. Three scenarios have been analyzed, respectively corresponding to three kinds of photovoltaic system's dynamic behaviors: stopping operation after voltage sags, low-voltage ride-through capability and dynamic voltage support. In addition, P-V curve is applied to do theoretical interpretation for the simulation results in the revised IEEE 33-bus distribution network, and it is testified that grid-connected photovoltaic systems equipped with low-voltage ride-through capability can remarkably improve distribution network transient voltage stability, and the effectiveness would be more prominent with the dynamic voltage support of photovoltaic systems.

关键词： transient voltage stability photovoltaic grid-connected system low-voltage ride-through capability induction motor voltage response characteristic dynamic voltage support

来源：评论

学校读者我要写书评

暂无评论

Dynamic modelling and small signal analysis of push-pull bidirectional DC-DC converter

引用

Computer Modelling and New Technologies 2014年第10期18卷 14-18页

作者： Zhang, Hongjuan Quan, Long Gao, Yan Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan China

Bidirectional DC-DC converter can not only act as a contact bridge between two different voltage levels systems, but also can achieve the energy flow in both directions. However, due to the operating characteristics of the active switch and diode in the converter, thereby the inverter becomes a strong nonlinear circuit. In light of this, the push-pull bidirectional DC-DC converter is designed and the method of state space small signal analysis is proposed. First of all, the state-space equations of the converter are established. Then each variable of inverter circuit is averaged in a switching cycle to eliminate the influence of the switching ripple. The respective average variable expressions are decomposed into the DC component and AC small signal component. After the DC component of the signal is eliminated, the expression of the AC small signal component is obtained, to achieve the purpose of separating the small signal. Finally, the expression of small signal component is linearized, thereby the nonlinear system is approximated the DC operating point. This study will provide the theoretical foundation ready for the analysis and design of converter controller.

关键词： Linearization

来源：评论

学校读者我要写书评

暂无评论

The power supply design software model for mine based on VBA technology

引用

Computer Modelling and New Technologies 2014年第8期18卷 127-130页

作者： Jin, Baoquan Hao, Xiaohui Zhang, Hongjuan Gao, Yan Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Taiyuan China

Coal mine power supply system is increasingly complex, resulting in difficulties for power computing and tuning. A software design program is proposed by using VBA development tools embedded in AutoCAD secondary development, adopt object-oriented program, ActiveX automation technology and visual programming techniques to achieve human-computer interface and database interaction, design one of the mine power supply design software with function mapping, statistical calculations, protection setting, design reports automatically output, data maintenance. The study shows that the software can greatly simplify the power supply design process, improve efficiency, and can effectively improve the coal mine management level.

关键词： Software design

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：