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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Liu Lian-guang Zhang Hao Liu Chun-ming Guo Jian-hui Guo Qing-xiong Ministry of Education Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Beijing China Hunan Chenzhou Electric Power Chenzhou Hunan China

The magnetic storm results in the transmission lines with geomagnetically induced current (GIC). And GIC happening in random has the frequency between 0.001 Hz~0.1 Hz, and continues from several minutes to several hours. Based on elaborating mechanism and characteristic of GIC in grids and the influence on China power grids, the article has conducted the research work of GIC monitoring technology, and has investigated the method of sampling data of GIC, the survey algorithm and the new monitoring device. The simulated test shows, the monitoring device can effectively measure GIC which is signal of quasi direct current and randomness, has advantages of having few data to be handled and needing little memory space, etc

关键词： power grids Computerized monitoring Circuit faults Storms power transmission lines Magnetic sensors Earth Magnetic field measurement Transmission line theory Magnetic devices

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Environmental/Economic Transaction Planning Using Multiobjective Particle Swarm Optimization and Non-Stationary Multi-Stage Assignment Penalty Function

Environmental/Economic Transaction Planning Using Multiobjec...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Rui Ma Peng Wang Huachun Yang Guoqiang Hu Changsha University of Science and Technology Changsha China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper presents a new approach for environmental/economic transaction planning model of the electricity market. The environmental/economic transaction planning problem is formulated as a multi-objective optimal power flow (MOPF) problem. A novel algorithm using multiobjective particle swarm optimization (MOPSO) and non-stationary multi-stage assignment penalty function is proposed to solve this problem. PSO is modified by using dynamic neighborhood strategy, new particle memory updating, and one-dimension optimization to deal with multiple objectives. Incorporating of non-stationary multistage assignment penalty function in solving OPF problem can improve the convergence. The proposed method is demonstrated on the IEEE 30-bus system. The results show that the proposed approach can efficiently gain multiple pareto optimal transaction planning that match with the sustainable development strategy

关键词： Environmental economics Particle swarm optimization power generation economics Load flow power system protection power system planning power system economics Fuel economy power system security control systems

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Data Envelopment Analysis Based Strategy of Assessing Schemes for power system Black Start

Data Envelopment Analysis Based Strategy of Assessing Scheme...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Liu Yan Gu Xueping Zhang Dan Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Dispatching Center of Yunnan Power Company Kunming China

Restoration of a power system after a complete blackout is a very important issue to the safety of the power system. Reasonable black start schemes are necessary to restore the power system as soon as possible. Based on data envelopment analysis, a new strategy for assessing black start schemes is proposed in this paper. Schemes' technical verification is taken into consideration in the process of the assessment. Whether a scheme is effective is defined by employing its input and output indexes' values entirely. The application to a practical power system verifies that the method could provide dispatchers more comprehensive and objective decision references

关键词： Data envelopment analysis power system analysis computing power system restoration power system reliability power system protection power system economics power system faults power system measurements Safety control systems

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A Novel HVDC Transmission system with Parallel Large Capacitor Connected in the DC Side of the Rectifier and Its Technical Feasibility

A Novel HVDC Transmission System with Parallel Large Capacit...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Chengyong Zhao Haibo Cui Gengyin Li Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In this paper, a novel HVDC transmission system is presented which is with parallel large capacitor connected in the DC side of the rectifier (shorted form HVDC-C). The fundamental principle and technology characteristics of HVDC-C are analyzed. The study shows that HVDC-C reduces the component of harmonic voltage and harmonic current both side in AC system and DC transmission line, makes control strategy more flexible and the filter structure more simple, etc. Furthermore, the control method, contrast to conventional HVDC and application foreground of HVDC-C is discussed briefly. The simulations based on PSCAD/EMTDC show that HVDC-C can operate steadily, has the capability to restore steadily when short circuit fault occurs, and is feasible technically and obvious in advantages

关键词： HVDC transmission Capacitors Rectifiers power harmonic filters Transmission lines Voltage control control systems Circuit simulation PSCAD EMTDC

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Multiagent And WAN Based Adaptive Coordinated protection system

Multiagent And WAN Based Adaptive Coordinated Protection Sys...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Song Shaoqun Zhu Yongli Huang Min Yu Hong Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China North China Electric Power University Baoding China

This paper presents a multi-agent and WAN based adaptive coordinated protection system (MAWBACPS). The system utilizes IP intranet to realize real-time wide area information exchange of a power system. Multi-agent system's several good qualities to solve distributing problems are used to realize the coordination of the operation settings of protective relays. A new idea of effortful adaptation for power system protection is proposed, and a new method to determine adaptive coordinated relay settings of lines are proposed in this paper. Moreover, the structure, communication mechanism and coordination control strategy of MAWBACPS, and relating agents' design are presented. Experiment results illustrate that MAWBACPS can realize the coordination of protections, enable the back-up relays to use their adaptive settings in most situations, and efficiently improve the security of power system

关键词： Wide area networks Adaptive systems power system protection power system relaying Protective relaying power system reliability power system security Communication system control Communication system security Substation protection

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On site PD detection on XLPE cable accessories

On site PD detection on XLPE cable accessories

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Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Wei Wang Changyu Li Chengrong Li Bin Zheng Luhua Zhang Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education School of Electrical Engineering North China Electric Power University Beijing China

On-site partial discharge detection on XLPE cables accessories is very difficult because of pulse noise interference, such as pulse interference created by automobile ignition coils on the street, etc. A suitable solution for the monitoring of cable accessories during operation is a sensitive on-site PD detection method. This can be realized in an advantageous way with combinatorial sensors, an antenna sensor, a UHF sensor, and two VHF split-core PD sensors. These sensors are not connected to the high voltage directly, a UHF sensor can be placed near the cable joint and two split-core sensors can be installed on both sides of the cable joint easily and safely. The detection making several windows in the time domain towards multiple wide-band pulse signals can achieve reliable discrimination of real internal PD and external noise under noisy on site conditions. More than twenty cases of on-site PD detection for HV XLPE cables have been proven this way. This method has high detection sensitivity and high noise recognition ability

关键词： Partial discharges Cables Interference Automobiles Ignition Coils monitoring UHF antennas Voltage Wideband

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Residual voltage transformation method for short-circuit current calculation with matrix transformation

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2005年第23期25卷 61-65页

作者： Jiang, Tong Bai, Xue-Feng Guo, Zhi-Zhong Lu, Ying Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

Unbalanced element brings a big problem to fault analysis of symmetrical components method. According with fault analysis of phase components, a residual voltage transformation method for short-circuit current calculation is presented with matrix translation in the place of classical sequence networks connection, which is suitable for both phase coordinates and symmetrical components coordinates. Calculation formulas are proposed with matrices calculation to deal with unsymmetrical faults and parameter matrices for various faults are listed. Analysis of simultaneous faults with unbalanced parameter element is done without calculation qualities increased. Simple examples have shown that the method is practical and suitable for programming.

关键词： Short circuit currents

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The Research of Electric Appliance Running Status Detecting Based on DSP

The Research of Electric Appliance Running Status Detecting ...

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Baoshu Li Chao Quan Shutao Zhao Weiguo Tong Peng Tao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China North China Electric Power University Baoding China

A new load detection method was presented based on its running status of power system. The loads are sorted according to their index of capacitive, inductive, and none-linear. The static character of each load was got according to the time-distribution. The concept of load detection is completed. The data-sample and wave recording equipment is designed and assembled based on the DSP for power loads status detecting. The superior software was designed for data management and analyzing. The recognizing status data was analyzed in both time-domain and frequency-domain; the identifying method for electric power loads status is deduced based on the correlation coefficient; the mathematical model for the status identifying is built; the trueness and validity of the methods is verified based on the testing and analyzing

关键词： Home appliances Digital signal processing Data analysis power systems Assembly Software design Time domain analysis Frequency domain analysis Mathematical model Testing

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power Quality control Center and Its control Method

Power Quality Control Center and Its Control Method

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IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Peng Li Qian Bai Baoli Zhao Yihan Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Baoding Baoling Transformer Company Limited Baoding Hebei China

power quality becomes an emphasis of related researches. Based on the detailed study on QCC (quality control center) of the FRIENDS first advanced by Japanese scholars, the functions of QCC are expanded and its basic types and structures are defined. Meanwhile, by detailed study, this paper introduces the multiple adjusting functions of UPQC (unified power quality conditioner) which is the chief part of QCC and presents its typical topological circuit. Moreover, H infin control technology is used to realize the synthesis tracking compensation of voltage and current for UPQC. Finally its validity has been testified successfully

关键词： power quality power supplies power system reliability Automatic control Energy management Quality management Communications technology Quality control power system management power generation economics

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A new ultra high-speed protection scheme based on wavelet analysis

A new ultra high-speed protection scheme based on wavelet an...

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International power Engineering Conference (IPEC)

作者： Ming-yu Yang Wan-ye Yao Zeng-ping Wang Ju Zhang Yan-jun Jiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China Automation Department North China Electric Power University Baoding Hebei China

ISBN: (纸本)9810557027

A new ultra high-speed protection scheme is proposed in this paper. Using wavelet transform with multiresolution analysis, the current signals is decomposed into a series of detailed wavelet components. The spectral energies of the wavelet components are calculated and then employed to detect the faults. Characteristics of the proposed ultra high-speed protection algorithm are analyzed and results of simulation studies are given. The results show that the proposed algorithm is promising and easy to implement for computer relaying application

关键词： protection Wavelet analysis Wavelet transforms Multiresolution analysis Fault detection Algorithm design and analysis Computational modeling Analytical models Computer applications Protective relaying

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