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New mitigating measures against core saturation by series of additional grounding resistance from the point of view of network configuration

New mitigating measures against core saturation by series of...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Ma, Yulong Xiao, Xiangning Jiang, Xu IEEE Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control Ministry of Education Beijing China

ISBN: (纸本)0780391144

High current of HVDC grounding electrode will induce a high potential in the nearby substation ground grid if the soil resistivity is high. Once there are potential differences among the ground grids, direct current will flow through the neutral grounded transformer. If the direct current through transformer winding is high enough core saturation will occur. The paper presented a method of series of additional resistance between the transformer neutral point and ground grid from the point of view of network configuration. A novel optimized algorithm is adopted in order to calculate the grounding resistance. Method presented in the paper is tested with China South Grid data. Results show that current through transformer neutral point can be reduced greatly and thus core saturation can be avoided. © 2005 IEEE.

关键词： Electric grounding

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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...

引用

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

作者： Yang, Ming-Yu Wang, Shi-Xu Mao-ying, Chen 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

ISBN: (纸本)0780391144

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. Lipschltz 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. © 2005 IEEE.

关键词： EHV power transmission

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Research on dynamic mathematic model of VSC-HVDC based on energy conservation principle

Research on dynamic mathematic model of VSC-HVDC based on en...

引用

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

作者： Li, Guangkai Li, Gengyin Zhao, Chengyong Liang, Haifeng Yin, Ming IEEE Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei China

ISBN: (纸本)0780391144

Voltage Source Converter (VSC) based HVDC (VSC-HVDC) technology is a kind of newly developed HVDC transmission technology. Based on analyzing the fundamental functions of VSC-HVDC, a dynamic mathematic model based on energy conservation principle is developed in this paper. The process of energy conversion and dynamic operation mechanism are analyzed. Theoretical analysis and the control system are validated by simulation on software PSCAD/EMTDC. © 2005 IEEE.

关键词： Energy conservation

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Data mining used for the assessment of the ability of bidding units

Data mining used for the assessment of the ability of biddin...

引用

2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Li, Ran Li, Jinghua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Provinece China

ISBN: (纸本)0780391144

A new data-mining method for assessment of the ability of bidding units is proposed in this paper. The algorithm of reducing attribute value is introduced to get minimum rules. An example which considers the various factors is illustrated the procedure of finding association among many factors and then obtained the rules to assess bidding units ability. The rules are very useful in supporting the generating bidding unit to make decisions and helping the electric agency (power eXchange -PX) and (Independent system Operator- ISO) to design an optimal trade plans. © 2005 IEEE.

关键词： Electric utilities

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Research on flywheel energy storage system using in power network

Research on flywheel energy storage system using in power ne...

引用

Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Jianeheng, Zhang 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

ISBN: (纸本)0780392965

The flywheel energy storage (FES) system presented in this paper is composed of four parts;the flywheel, the bearing, the motor/generator and the power converter. The control methods and strategy of the FES system in power network are introduced in detail. During the storage period and generating timei, the waveform of the power converter output currents is controlled to be sinusoidal by using sinusoidal pulse width modulation (SPWM) control method, so the efficiency of the energy conversion is high and the torque ripple of the motor/generator is minimized. The control methods of starting and operating large moment of inertia of the flywheel are simulated and studied for the power converter. The latest experimental results of the FES system are Introduced, and the control validity is verified through these results. © 2005 IEEE.

关键词： Energy storage

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Application in electric power system transient stability analysis with PC cluster system

Application in electric power system transient stability ana...

引用

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

作者： Lu, Jinling Yu, Lei Zhu, Yongli 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

ISBN: (纸本)0780391144

In this paper, a simple parallel calculation cluster is built by PC and local area network. The power electric network is divided into several subnets according the method of path graph partitioning. Subnets are allocated to PC unit to calculate individual and the server is in charge of adjusting process and counting the current of link line. Besides soft-hard ware environment of PC cluster is given in this paper and the design and implementation of program are also presented. The key technique and way to settle problem are discussed during implementation procedure. At last, the IEEE39 nodal points system is tested. The satisfaction result is gotten by comparing to single computer. © 2005 IEEE.

关键词： Electric power transmission networks

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Determination of total transfer capability incorporating FACTS devices in power markets

Determination of total transfer capability incorporating FAC...

引用

Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Gengyin, Li Ming, Zhou Yajing, Gao 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

ISBN: (纸本)0780392965

It is very important and necessary to calculate Total Transfer Capability (TTC) incorporating Flexible Alternate Current Transmission system (FACTS) devices in power markets and analyze impacts of FACTS on TTC. Calculating TTC incorporating with FACTS devices is an optimal problem constrained by some equalities and inequalities. This paper proposes a mathematical model for calculating TTC incorporating with FACTS devices in power markets, and detailed calculation method is also put forward. The constraints include voltage constraints, thermal stability limits, generator's capacity limits, load demand, steady-state power flow, and control parameter constraints of FACTS devices, etc. The sensitivity-based repetitive linear iterative approach is proposed to solve the proposed model. The detailed solution process is described in this paper. To realize the proposed model and calculation method, a TTC calculation software incorporating with FACTS devices is developed based on PSASP/UPI, a set of advanced application software package developed by China Electric power Research Institute. This paper proposes a new approach on combined TTC solution including FACTS and power flow calculation based on PSASP/UPI, and gives the interface program for User Programming Interface (UPI) in PSASP. The IEEE 14-bus test system is used to verify the proposed algorithm and program. Numerical results show that FACTS devices and their locations have different impacts on TTC, also prove that the proposed model and algorithm is correct and effective. © 2005 IEEE.

关键词： Electric power transmission

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Research on super capacitor energy storage system for power network

Research on super capacitor energy storage system for power ...

引用

Sixth International Conference on power Electronics and Drive systems, PEDS 2005

作者： Jiancheng, Zhang 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

ISBN: (纸本)0780392965

A Super Capacitor Energy Storage (SCES) system applied to distributed generation system and distribution network is presented, which is mainly composed of three parts: the electrical double-layer capacitors array that stores energy, the AC/DC-DC/AC power converter system and the integrated control system composed of microprocessors. Application studies of the SCES system for active power supply, voltage control, voltage oscillation elimination and harmonic elimination are described. The stability and control effect of the system relation to the node impedance are analyzed in detail. This paper also presents studies on experiments of the SCES system synchronous and re-synchronous operating with power network when grid fault and recovered. © 2005 IEEE.

关键词： Energy storage

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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...

引用

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

ISBN: (纸本)0780391144

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. © 2005 IEEE.

关键词： Electric fault location

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key elements extraction based on particle feature and RBFNN in new meter calibration method

Key elements extraction based on particle feature and RBFNN ...

引用

2005 IEEE International Conference on Industrial Technology, ICIT 2005

作者： Shutao, Zhao Baoshu, Li Jinsha, Yuan Dongsheng, Zhao 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

ISBN: (纸本)0780394844

Imitating human's ability of visual and analysis models, a computer vision-based measuring-instrument calibration method is proposed in this paper. Capturing meter images from real-time video with every analog output, via Radial basis function neural network (RBFNN) to classify the dial plate elements, and meter reading can be obtained from complex needle movement. The particle feature extraction, RBFNN simple architecture and fast training process can satisfy the real-time meter reading perfectly in the needle identifier and reading recognition. The least squares fit method based on maximum likelihood estimate is efficient in needle parameter derivation, and the computer vision-based meter calibration method has high performance and accuracy. © 2005 IEEE.

关键词： Computer vision

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