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Study on wide area measurement system based transient stability control for power system

Study on wide area measurement system based transient stabil...

引用

International power Engineering Conference (IPEC)

作者： F.F. Song T.S. Bi Q.X. Yang Si Fang Research Institute Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

In this paper, the state of the arts of power systems in China and some applications in transient stability control based on wide area measurement system (WAMS) are introduced briefly. With the development of power grid interconnection and transmission utility deregulation, the operation of electric power system become more and more complex, which challenges the security and transient stability control of power systems. The advent of WAMS opens a new path to the system trajectory prediction and real time closed-loop stability control to prevent power system outage. The defects of current transient stability control system are analyzed, then a possible scheme of transient stability control based on WAMS is proposed, and the corresponding future work is put forward as well. Finally, a new way of solving cascading events is discussed

关键词： power system transients power system stability power system control Wide area measurements Control systems power system measurements power systems power system interconnection power system security power system analysis computing

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Project Study of dynamic Voltage Restorer

Project Study of Dynamic Voltage Restorer

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

作者： Zhongdong Yin Minxiao Han Lixia Zhou Kunshan yU Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China China Electrical Power Research Institute Beijing China

The paper studies a practical project of 2 MVA dynamic voltage restorer on the basis of transformer-less cascade multilevel topology, it discusses each part working principle of DVR, but also provides a practical voltage sag problem solving scheme for a 6 kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme

关键词： Voltage fluctuations power quality power system dynamics power system restoration Computer aided manufacturing Variable speed drives Umbilical cable Electricity supply industry Accidents Superconducting magnets

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Monte Carlo Simulation Based Available Transmission Capability Calculation

Monte Carlo Simulation Based Available Transmission Capabili...

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

作者： Yajing Gao Ming Zhou Gengyin Li Yuekui Huang Limin Xiao Rui Li Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

With the further development of power markets, large amount of electric power wheeling and frequent transmission transaction is emerging, accurately determining available transmission capability (ATC) and broadcasting the ATC information in time are very important to prevent and relieve transmission congestion effectively. In practical power markets, there are large amount of uncertainties involved in transmission reliability margin (TRM) and capacity benefit margin (CBM) of ATC. Considering calculation accuracy and time, a novel approach is proposed to calculate ATC based on Monte Carlo simulation and sensitivity analysis considering large amount of uncertainties impacting the value of ATC. The steady state constraints and voltage stability and transient stability constraints are taken into account. The iterative solution based on PSASP by China EPRI is developed. IEEE 14-bus test system is used to verify the presented approach. The results show that the model and algorithm is correct and effective. The research achievements are undergoing to transfer to the application in certain provincial power system in China, and some new problems are suggested in the end of paper

关键词： power markets Uncertainty Stability power system modeling Broadcasting Transmission line measurements Accuracy Sensitivity analysis Steady-state Voltage

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On site PD detection on XLPE cable accessories

On site PD detection on XLPE cable accessories

引用

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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Research on the Arithmetic of Non-unit Voltage protection for EHV Transmission Line Based on Wavelet Analysis

Research on the Arithmetic of Non-unit Voltage Protection fo...

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

作者： Ming-yu Yang Shi-xu Wang Chen Mao-ying Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This paper presents a new non-unit voltage protection algorithm for extra high voltage (EHV) transmission lines. This scheme is developed using wavelet analysis, in which the singularity of fault transient voltage signals in one terminal is utilized to discriminate clearly between internal and external faults. Lipschitz exponent (LE) is obtained from wavelet modulus maximum to detect singularity of signals. A typical 500-kV EHV transmission system has been simulated by ATP to evaluate the scheme. The simulation results show that this scheme is capable of providing correct responses under various system configurations and fault conditions

关键词： Arithmetic Voltage Transmission lines Wavelet analysis power system transients power system protection power transmission lines Wavelet transforms Circuit faults Signal detection

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Technology of detecting GIC in power grids & its monitoring device

Technology of detecting GIC in power grids & its monitoring ...

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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...

引用

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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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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The Research of Electric Appliance Running Status Detecting Based on DSP

The Research of Electric Appliance Running Status Detecting ...

引用

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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Fourier series method on eliminating narrow frequency noise in partial discharge detection

Fourier series method on eliminating narrow frequency noise ...

引用

Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Yangchun Chen Chengrong Li Wei Wang North China Electric Power University Beijing China Beijing Key Laboratory of High Voltage and EMC Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Beijing China

A new method to eliminate periodical narrow frequency noises in partial discharge detection of electric power system apparatus, Fourier series method, is presented. It uses the difference not only on frequency domain but also mainly on time duration between signals and noises. The anti-interference effect of this method was analyzed by experiments data on field. Several factors that can make influence to the affect of this method, such as the error of frequencies of the noise, the data length by which the Fourier coefficients are calculated, the error of A/D conversion, were discussed respectively. It was found that this method can almost completely banish narrow frequency noises, at the same time can retain the amplitude and polarity of partial discharge pulses, even if the main frequency of the partial discharge pulses are close to that of narrow frequency noises. The affect of this method was also contrasted with normal method, such as digital filter, adaptive filter and wavelet. The result shown that this new method has obvious predominance at remaining the amplitude and polarity of pulse signals.

关键词： Fourier series Partial discharges Pulse power systems Low-frequency noise Laboratories Frequency domain analysis Noise level Digital filters Adaptive filters power system harmonics

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