检索结果-内蒙古大学图书馆

IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Guangkai Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424427994

The stability problem during the initial period of power system restoration is mainly related with the following aspects. It is infirmly to resist interference since the power system scale is not large. It is easy to result in instability or short circuit fault for frequently and quickly load change. It is easy to arouse generation self-excited problem for the fewer load in total. Based on these characteristics of VSC-HVDC, the transmission line including VSC-HVDC is selected to restore system and its circuit model is founded in this paper. The simulation results show that the system can keep stability when the system is in steady state and fault. There are no self-excited problems. The speed of charging the transmission line and restoring loads is high too. Because of the isolation of the direct line the impact to source can be avoided by the long AC line, as is favor of the quick power system restoration.

关键词： Stability analysis power system restoration Circuit stability power system stability Circuit faults power transmission lines Distributed parameter circuits Resists Interference power system analysis computing

来源：评论

学校读者我要写书评

暂无评论

Flow transferring identification algorithm with consideration of transient period

Flow transferring identification algorithm with consideratio...

引用

IEEE General Meeting power& Energy Society

作者： T.S. Bi H.M. Xu S.F. Huang Q.X. Yang Key Laboratory f Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Cascading trips caused by flow transferring are crucial for lots of well-known blackouts. For a power system with heavy load flow, once there is a fault, the system might suffer flow transferring after the fault clearing. However, for relays, they cannot know the sensing overcurrent is caused by internal faults or flow transferring. The relays will trip the overcurrent after the predefined time delay, which might result in flow transferring again and worsen the system state. Therefore, if relays pickup due to flow transferring, the back-up relay should be blocked until the thermal limit of the line reaches. In this paper, Flow Transferring Relativity Factor (FTRF) is suggested to estimate the flow distribution after a line is tripped. Moreover, based on the relationship of node injection and branch currents, the impact of transient period on the flow distribution is analyzed. Finally, a flow transferring identification algorithm is presented to distinguish flow transferring from internal fault caused by fault clearing. The simulation results of 10-generator 39-bus New England system show that the proposed flow transferring identification algorithm works well.

关键词： power system protection power system faults power system relaying power system dynamics power system transients Wide area measurements Fault diagnosis power system security Bismuth Delay effects

来源：评论

学校读者我要写书评

暂无评论

The implementation of fuzzy adaptive PI controller in VSC-HVDC systems

The implementation of fuzzy adaptive PI controller in VSC-HV...

引用

IEEE PES power Systems Conference and Exposition, PSCE

作者： Haifeng Liang Gengyin Li Ming Zhou Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Changping North China Electric Power University Beijing China

Focusing on the passive network, this paper analyzes the discrete mathematical model and its control strategy of the passive terminal of the VSC-HVDC system on the basis of the alpha-beta frame of axes. The method of the functioning-fuzzy-subset inference is introduced into automatic regulation of the proportional integral (PI) parameters. Based on the digital signal processor (DSP), the fuzzy PI control method is adopted and the VSC-HVDC experiment device is constructed. The experiment of constant AC voltage control based on fuzzy adaptive PI controller in transmitting power to passive network via VSC-HVDC system is developed. The experimental results show that the fuzzy controller with adaptive PI parameters for AC voltage control of VSC-HVDC system is effective.

关键词： Fuzzy control Fuzzy systems Programmable control Adaptive control control systems Voltage control Automatic control Passive networks Mathematical model Digital signal processors

来源：评论

学校读者我要写书评

暂无评论

Substation Reactive power and Voltage control Using Fuzzy control Theory

Substation Reactive Power and Voltage Control Using Fuzzy Co...

引用

International Conference on Industrial and Information Systems, IIS

作者： Zengqiang Mi Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

ISBN: (纸本)9781424439362

In this paper, with analyzing the existing questions of conventional nine-area voltage and reactive power integrated control method, a new fuzzy control logic based dynamic reactive power boundary substation voltage and reactive power integrated control method is proposed. The fuzzy logic control strategies of this method can finish the decoupling control of voltage and reactive power in tight coupled zone to improve the control performance, dynamic reactive power boundary related to the system voltage can preferably adapted to the load characteristics. The system structure, fuzzy logic control rules and membership function of the proposed method are introduced. Simulation results and practical operating data have proved that this approach shows better robustness and performance compared with the conventional nine-area control method, it can reduce the adjust times of transformer tap and capacitors effectively and increase the service life of the transformer tap changer and capacitors switch.

关键词： Substations Reactive power control Voltage control Fuzzy control control systems Centralized control Fuzzy logic Fuzzy sets Switches power system stability

来源：评论

学校读者我要写书评

暂无评论

Simulation Research on the Multiple Objective Voltage Quality Regulator

Simulation Research on the Multiple Objective Voltage Qualit...

引用

IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Yajing Di Zhongdong Yin Xiangning Xiao Zhi Zhang Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education Beijing China

Due to the complexity of power systems combined with other factors such as increasing susceptibility of equipment, power quality (PQ) is apt to waver. With electricity in growing demand, low PQ is on the rise, the method of resolve those problem about power quality must be considered. In accordance with the familiar PQ problem, such as voltage sag, voltage swell, short interruption of supply voltage, harmonic suppression and short circuit fault. Basing on the H bridge cascade connection method, this paper design a new type regulator for the multiple objective control. Through the simulation software of PSCAD/EMTDC, the device can resume the voltage and restrain the harmonic dynamically and effectively, when there are voltage disturbances in the power system side. This device also could confine the short circuit current to a supportable level, when there is short circuit fault in the load side.

关键词： Regulators power system simulation PSCAD Voltage fluctuations power quality Circuit faults power system harmonics Harmonics suppression Bridge circuits Design methodology

来源：评论

学校读者我要写书评

暂无评论

New Topological Structure of Combination Switch Based Reactive power Compensation Installation

New Topological Structure of Combination Switch Based Reacti...

引用

Pacific-Asia Conference on Circuits, Communications and Systems, PACCS

作者： Fei Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A new topological structure of combination switch based reactive power compensation installation is presented in this paper. The new topological structure overcomes those shortcomings of traditional product satisfactorily by take advantage of the features of new system topological structure: concise structure, flexible configuration, high speed communication and powerful capacity of resisting disturbance. The new system topological structure and software program design features of this new installation are described in detail, contrastive analysis and practical test between the new installation and the traditional product are discussed. The results show that the new installation not only has the virtue of: structural standard, simply connection, intelligent identification, easy to extend, high reliability and high power density, but also improves the performance index by means of integrated intelligent control principle and compensation capacity dynamic modification.

关键词： Switches Reactive power ISO standards Reactive power control power system dynamics control systems Communication system control power system reliability Low voltage Access protocols

来源：评论

学校读者我要写书评

暂无评论

Analysis on measuring performance of three Flicker Detecting Methods

Analysis on measuring performance of three Flicker Detecting...

引用

IEEE General Meeting power& Energy Society

作者： Qing Chen Xiufang Jia Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Voltage fluctuation and flicker is an important aspect of power quality. The core of flicker analysis is to track the envelope of voltage signals and then calculate the short-term flicker severity P st , which is the premise of flicker source location. This paper firstly derives the formulas of extracting flicker envelope of signals containing harmonics using Teager energy operator and Hilbert transform. Then the measuring performance of Teager energy operator, Hilbert transform and square demodulation of flicker with one frequency, multi-frequencies and with harmonics are analyzed. After extracting the flicker envelope, the flicker frequency and amplitude error, and short-term flicker severity P st error are calculated. Besides the relationships between amplitude error and frequency, P st error and frequency with respect to these three methods are illustrated respectively. At last it is proved that Hilbert transform has the highest accuracy and stability than TEO and square demodulation with the increase of frequency.

关键词： Performance analysis Voltage fluctuations Demodulation power quality Signal analysis Position measurement Energy measurement Frequency measurement Harmonic analysis Stability

来源：评论

学校读者我要写书评

暂无评论

Complete-independent control strategy of active and reactive power for VSC based HVDC system

Complete-independent control strategy of active and reactive...

引用

IEEE General Meeting power& Energy Society

作者： Chengyong Zhao Chunyi Guo Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

The performance of VSC based HVDC system partially depends on its control strategy. Based on the steady state model of VSC-HVDC system, a power control strategy is proposed and a series of mathematical analysis expressions for power delivery are deduced using the coordinate conversion and variables substitution in terms of the original equations. The corresponding power controllers are designed using the PI controller and the nonlinear inverse system. Based on the strategy designed, the transmission limits of active power and reactive power are deduced. According to the circle characteristic of operation represented, it is proved theoretically that the control strategy can independently control the active and reactive power. Case studies are also carried out to testify the control strategy designed using the PSCAD/EMTDC software. Simulation results verify that the power control strategy designed can independently control active power and reactive power and the controllers have rapid responding speed, desirable stability, and highly steady state control accuracy.

关键词： control systems Reactive power control HVDC transmission Steady-state power control Nonlinear control systems Mathematical model power system modeling Mathematical analysis Nonlinear equations

来源：评论

学校读者我要写书评

暂无评论

Feedback Linearization Based Nonlinear control Strategy of VSC-HVDC

引用

IFAC Proceedings Volumes 2009年第9期42卷 308-313页

作者： Gengyin Li Ming Yin Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China (Tel: +86 10 80798551) State Power Economic Research Institute Beijing 100761 P.R. China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China

The model of Voltage Source Converter (VSC) based HVDC in the synchronous dq reference frame is presented in this paper. The model includes the DC link model and the VSC models. The feedback linearization principle for Multi-input Multi-output plants is analyzed. Based on the analysis, nonlinear decoupling control strategies for the two VSCs are proposed. For one VSC, the proposed nonlinear control strategy enables it to decouple DC voltage and reactive power control, and for the other one, the strategy guarantees the control of active power and that of reactive power independently. Simulation was conducted with MATLAB/Simulink software to verify the proposed control strategies. The simulation results prove that the nonlinear decoupling control strategies are able to provide good performance.

关键词： Feedback linearization HVDC nonlinear control strategy voltage source converter (VSC)

来源：评论

学校读者我要写书评

暂无评论

A fault location scheme based on spectrum characteristic of fault-generated high-frequency transient signals

A fault location scheme based on spectrum characteristic of ...

引用

IEEE General Meeting power& Energy Society

作者： S. F. Huang X. G. Wang Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

When a fault occurs on a transmission line, fault-generated high-frequency signals contains a lot of information about fault. This paper proposes a fault location scheme for transmission lines based on spectrum characteristic of high-frequency components, the difference of adjacent two natural frequencies in one ends of transmission line is used to compute fault distance. This method need not identify arriving time of first traveling wave and traveling wave from fault point, it is insensitive to swings, fault type, fault resistance and system source parameters. The scheme performance was proven using power system computer aided design (PSCAD) simulations in 500-kV power system considering critical fault cases.

关键词： Fault location power transmission lines PSCAD power system simulation power system transients Frequency Fault diagnosis Computational modeling Computer simulation power system faults

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：