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Research on remote meter automatic reading based on computer vision

Research on remote meter automatic reading based on computer...

引用

2005 IEEE/PES Transmission and Distribution Conference and Exhibition: Asia and Pacific

作者： Zhao, Shutao Li, Baoshu Yuan, Jinsha Cui, Guiyan Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China Electrical Communication Department North China Electric Power University Baoding 071003 China North China Electric Power University Baoding 071003 China

ISBN: (纸本)0780391144

A novel method is put forward, which the power meter can be read based on compute vision, and the architecture of remote meter auto reading system is designed. Different with the normal automatic meter reading system that must obtain the value from digital communication interface, the new method recognizes the meter reading utilizing the computer vision technique, it is a kind of non-contact measurement. In the meter automatic reading, the computer vision discrimination, incorporate human's ability of visual and apprehensive models. Not only the digital display power meter can be read, but also the direct-reading instrument can be fetched In this paper, the scheme of remote automatic reading is introduced, the local meter reading information of distributed substation can be transmitted to center using computer network. And then the pretreatment, segmentation and pattern matching, are detailed description in the meter image recognition process. Via energy meter automatic recognition experiment, the results based computer vision is accurate enough to monitor the remote substation running parameters. © 12005 IEEE.

关键词： Computer vision

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A statistical method of improving the resolution of time-delay of UHF signals for PD location in transformers

A statistical method of improving the resolution of time-del...

引用

Conference on Electrical Insulation and Dielectric Phenomena, (CEIDP)

作者： Zhiguo Tang Chengrong Li Xu Cheng Wei Wang Jun Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

It's important to make an accurate PD location in transformers for fault diagnosis and maintenances of power systems. Theoretically it's possible to locate the PD source by measuring the differences in the arrival time at the UHF sensor array. The propagation velocity of EM wave in air is 30 cm/ns, which is extremely fast, so the resolution of the time-delay of UHF signals detected at the UHF sensor array is one of the key points to make an accurate PD location. Here, we propose a mathematical method: cross-correlation-shifting-averaging algorithm that can improve the resolution of the UHF signal's time-delay by increasing the signal to noise ratio and reducing the time dispersion caused by the random nature of PD. The practical processing results of experimental data from our laboratory indicate that the method can increase the time-delay resolution by nano-seconds in some cases, which improve PD location accuracy by tens of centimeters.

关键词： Statistical analysis Signal resolution Transformers Sensor arrays Microwave antenna arrays Fault diagnosis power system faults power system measurements Time measurement UHF measurements

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Iterative Prony Method Based power system Low Frequency Oscillation Mode Analysis and PSS Design

Iterative Prony Method Based Power System Low Frequency Osci...

引用

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

作者： Hu Guoqiang He Renmu Yang Huachun Wang Peng Ma Rui 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 an identification method based on the iterative Prony to identify transfer function and configure PSS parameters using residue way. The iterative Prony is a very useful method to acquire power system oscillation modes, by which the system eigenvalue, oscillation frequency, amplitude, damping and relative phase can be directly estimated using the response of given input signals. Considering the influence of input signal on output signal, the iterative Prony can acquire the transfer function of power system, then, according to the corresponding residues we conducted coordinated setting of power system stabilizer (PSS) by residue method. The simulation results for two testing system examples prove that this proposal method is effective in the power system oscillation mode analysis and parameters determination of PSS, can improve eigenvalues of system and can enhance system damping after PSSs whose parameters are optimized by above method are built into power system

关键词： Iterative methods power system analysis computing power system simulation Transfer functions Eigenvalues and eigenfunctions Frequency estimation Damping Amplitude estimation Phase estimation Analytical models

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The fault diagnosis layer model of electric power grid based on weighted mean roughness

The fault diagnosis layer model of electric power grid based...

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

作者： Li Ran Ix Li Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education China Electric Power University Baoding Hebei China

Based on rough set, this paper use discernibility matrix to reduce the condition attributes. The reduced samples are laid by weighted mean roughness to avoid blindness and redundancy. By this method, model space can be compressed greatly and weighted mean roughness is easy to calculate. Weighted mean roughness is used to separate attributes' priority in every lay, which make the diagnosis system had strong tolerant ability. When the electric power grid is fault, the result of diagnosis will be correct by searching every lay with priority level. The correctness and effectiveness are validated by the analysis result of emulation

关键词： Fault diagnosis power systems Fault tolerance Redundancy Blindness power system modeling Emulation power grids Rough sets power system reliability

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Research on DC Bias Due to Magnetic Storm and DC Transmission

Research on DC Bias Due to Magnetic Storm and DC Transmissio...

引用

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

作者： Weiping Shi Lianguang Liu Qian Wang Zongqi Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

This paper focuses on the research on the DC bias due to magnetic storm and HVDC. In the paper, we introduce the DC bias problem of Jiangsu Yang-Huai transmit electric system and Southern power Grids, discuss the harmful effect of the transformer DC bias and the significance of research, and analyze the compensation, weakening and elimination of transformer bias current. Finally, the problems that should be paid attention to and some corresponding suggestions are proposed

关键词： Storms power grids Substations HVDC transmission Grounding power transmission lines Electrodes Magnetic analysis system testing power generation

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Parallel operation of hybrid active power filter with passive power filter or capacitors

Parallel operation of hybrid active power filter with passiv...

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

作者： Yonghai Xu Xiangning Xiao Hao Liu Hong Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Harmonic pollution and reactive power compensation are the important power quality problems. This paper proposes a combined power filter system consisting of the parallel operation of a hybrid active power filter (HAPF) and the passive power filters or capacitors. The HAPF is formed by a single tuned LC filter per phase and a small-rated three-phase active filter, which are directly connected in series. The characteristics of the combined system and the harmonic current detection method using the combination of load current and the mains current are analyzed and simulated. The simulation results show that good filter performance can be obtained by the combined system. Experimental results from a 100 kVA/380 V hardware prototype parallel operation with capacitors are presented to conform the validity and effectiveness of the combined system

关键词： Active filters power filters power capacitors power harmonic filters power system harmonics Pollution Reactive power power quality Harmonic analysis Analytical models

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Multiobjective Optimization Scheduling Based on Fuzzy Genetic Algorithm in Cascaded Hydroelectric Stations

Multiobjective Optimization Scheduling Based on Fuzzy Geneti...

引用

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

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

The multi-objective fuzzy optimal method based on the fuzzified optimal solutions of single objectives need not list all non-inferior solution sets, which can optimize directly objectives in value area of variables. This method can reflect the interrelation between individual objective optimal solutions and multi-objective optimal solution. On the basis of fundamental principle of multi-objective fuzzy optimization and genetic algorithm, combing with the concept of objective relative subject degree, this paper presents a multi-objective optimization approach for the hydroelectric power system with contradictory objectives. The proposal method considers the satisfied degree of various characters and contradictory objectives and seeks an appropriate optimized solution to make each objective optimal as possible considering each objective comprehensively. The simulation results of example show that the fuzzy genetic algorithm is an effective method for multi-objective optimization problem in the cascaded hydroelectric plants

关键词： Genetic algorithms Optimization methods power system dynamics Laboratories power system protection power system security monitoring Fuzzy systems control systems Fuzzy set theory

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Study on the Reduction of Identified Parameters of the power Load's Aggregated Motor Model with the Aim of Sustaining Its Representability

Study on the Reduction of Identified Parameters of the Power...

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

作者： Wang Peng Wu Yan-hong Hu Guo-qiang Ma Rui Yang Hua-chun He Ren-mu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

There exists a fatal disadvantage for the integrated induction motor load model of too many parameters, which leads to the difficulty of finding optimal parameters set in the identification process. For this reason, a model parameter reduction method is proposed in this paper, which divides the above 14 parameters into two parts: one fixed parameters part alpha F and the other part alpha C : parameters needing identification. After defining of the representability of the load model, the criterion of rational division of alpha F and alpha C is set as remaining the representability of the load model. Thus the strategy of parameter reduction belongs to the optimization methods. For avoiding the large scale optimizing process, the reduction method of building priority sequence based on parameters' sensitivity is proposed. In the end, a case study is given out on the basis of certain power grid measurement data, which verified the simplicity and effectiveness of the proposed method

关键词： Load modeling Induction motors power system modeling power system simulation Mathematical model Optimization methods power system dynamics Differential equations Helium Large-scale systems

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Self zero sequence component control of dynamic voltage restorer in systems with different neutral point grounded modes

Self zero sequence component control of dynamic voltage rest...

引用

International power Engineering Conference (IPEC)

作者： Zhongdong Yin Lixia Zhou Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education. China Electric Power University China

ISBN: (纸本)9810557027

The dynamic voltage restorer (DVR) has become popular as a cost effective solution for the protection of sensitive loads from voltage problems such as sags. There are many investigations on DVR dealing with the unbalanced operation situations, however, few found in the area relating to DVR self zero sequence component control in power grid with different neutral point grounded modes. In fact, incorrect control strategy of zero sequence will lead DVR to instability in a special system condition. This paper studies the generating mechanism of self zero sequence component in systems with different neutral point grounded modes and presents effective control strategy to get rid of its influence. Simulations are carried out to verify the validity of proposed self zero sequence component control strategy

关键词： Voltage control control systems power harmonic filters Frequency power system restoration power system harmonics Costs power system protection power grids power quality

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An application to set up a model to forecast electric rate adjusted through cos/spl Phi/ using regressive analysis

An application to set up a model to forecast electric rate a...

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International power Engineering Conference (IPEC)

作者： Fang Cao Lizi Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9810557027

A 2-step tariff mechanism is adopted in Chinese electric power market. That means the payment of the customers is calculated through the cosPhi of a net node. So the value of cosPhi is used to adjust the rate of consumer's tariff. But because of the policy, the value of the adjusted rate can't be calculated accurately in advance. Some problems always lie in how to choose a proper model to make sure the adjusted value of electric rate when to analyze the economic benefit. The paper firstly points out the disadvantage of traditional method on forecasting the adjusted rate through cosPhi. Then it presents a new method to establish the forecast model based on regressive analysis. The model proposed here was applied in a distribution company and given the reasonable result. The paper describes the applicability of the proposed model and gives some explanation for application

关键词： Predictive models Economic forecasting Reactive power Laboratories power system protection power system dynamics power system security monitoring control systems power generation economics

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