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IEEE General Meeting power& Energy Society

作者： X. G. Wang S. F. Huang Q. K. 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 proposes a fault classification scheme for transmission lines based on spectrum of fault component. First it analyses the spectrum of fault component, then the characters of power frequency and nature frequencies in two data windows are used to identify fault type and fault phase respectively. The scheme performance was proven using ATP/EMTP simulations in a 500-kV power system considering different fault types and fault locations. The results show that the scheme works quickly and is not impacted by harmonics and the DC offset. It is also not sensitive to sampling rate and fault inception angle.

关键词： power transmission lines Circuit faults Frequency domain analysis Fault diagnosis Relays power systems Fault location

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power system transient stability assessment based on WAMS dynamic trajectories

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Dianli Xitong Zidonghua/Automation of Electric power systems 2008年第23期32卷 18-22页

作者： Qin, Xiaohui Bi, Tianshu Yang, Qixun Ma, Shiying China Electric Power Research Institute Beijing 100192 China Laboratory of Power System Protection and Dynamic Security Monitoring North China Electric Power University Beijing 102206 China

Some technical issues in the application of EEAC are discussed. A novel integrated rotor angle criterion, which includes both historical and future information of rotor angle curves, is proposed to identify the true critical cluster. Additionally, a composite criterion using the slope and angle of dynamic saddle point (DSP) is proposed to judge whether the DSP is the true DSP resulting in losing stability. Finally, the flowchart of transient stability assessment criterion is given. The simulation results demonstrate that the proposed method works well. It can assess transient instability even when the characteristic of instability is not obvious enough to take measures such as splitting as soon as possible.

关键词： Stability criteria

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Study of transient spectrum in transmission lines

Study of transient spectrum in transmission lines

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IEEE General Meeting power& Energy Society

When faults occur in transmission lines, the high frequency signals are caused by fault generated traveling waves and the spectrum is a series of harmonic in frequency domain. This paper utilizes lumped and distributed parameter models to express transmission lines respectively, analyzes the character of nature frequencies. Different influencing factors including different fault conditions, source impedance, bus capacitance, series compensated capacitance and shunt reactor are discussed in this paper. The results have been proven by ATP procedure in a typical 500- Kv power transmission line.

关键词： power transmission lines Capacitance Circuit faults Relays Copper Shunt (electrical) Inductors

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A security mechanism of Web Services-based communication for wind power plants

A security mechanism of Web Services-based communication for...

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IEEE General Meeting power& Energy Society

作者： Nian Liu Jianhua Zhang Wenxia Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

The IEC 61400-25 standard has defined mapping of power plant information model to Web services. How to ensure the security of Web services-based communication for wind power plants is a unsolved problem. WS-security is a standard used to deal with the security requirement in application of Web services, while username/password and X.509 certificates are security tokens most commonly used in electric power utility. We propose a security mechanism that deal with the requirements of authentication, integrity, non-reputation, and confidentiality across the communication process based on WS-security and the two security token. The security mechanism is implemented by extension of SOAP message, design of security agent, and the related security message processing algorithm. An instance is modeling based on IEC 61400-25 to demonstrate the security enhanced remote control of wind power plants. The result support the usefulness of the security mechanism for Web Services-based wind power plants communication.

关键词： security Cryptography Wind power generation Web services Simple object access protocol Authentication IEC

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Approach on pricing electricity for large consumers based on hedonic price model

Approach on pricing electricity for large consumers based on...

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3rd International Conference on Deregulation and Restructuring and power Technologies, DRPT 2008

作者： Ming, Zhou Xiangxin, Li Gengyin, Li IEEE Department of Electrical Engineering NCEPU NCEPU Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education

ISBN: (纸本)9787900714138

With the start of trial operation of direct purchasing electricity for large consumers in China, the method on how to price electricity is of vital theoretical and practical significance. Hedonic electricity pricing method is proposed to calculate the implicit prices of different characteristics of electricity. Based on the proposed model, the prices of electricity production cost, power quality and reliability characteristics are obtained. Comparing with the two-part pricing method, the hedonic electricity price model uses multiple electricity characteristics to make the electricity purchase price, instead of using single electric energy. Numerical examples show that the proposed approach can make purchase price more reasonable and fair. © 2008 DRPT.

关键词： power markets

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Hierarchical yardstick competition approach to assessing operation performance of distribution utilities

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Dianli Xitong Zidonghua/Automation of Electric power systems 2008年第4期32卷 20-24页

作者： Zhou, Ming Zhao, Wei Wang, Peng Li, Gengyin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China North China Bureau State Electricity Regulatory Commission Beijing 100070 China

Assessing distribution utilities' operation performance is an important precondition for effective supervision and competition promotion. A hierarchical yardstick competition approach to assessing the operation performance of distribution utilities is proposed. Firstly, a hierarchical analysis of indices reflecting the operation situation of distribution utilities is incorporated in the overall objective, the criteria layer and the index layer, by employing the analytic hierarchy process (AHP). Secondly, the judgment matrix and data envelopment analysis (DEA) are used to gain the weights and performance index of assessment criteria in the criteria layer and index layer, respectively. Finally, the overall relative performance index is derived by using the analytic hierarchy process. A numerical example is given to prove its feasibility and validity. This project is expected to provide scientific and practical reference to supervisors as well as managers of electric power companies for decision-making.

关键词： Analytic hierarchy process

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Reliability evaluation of distribution system with distributed generation based on Islanding algorithm

Reliability evaluation of distribution system with distribut...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Guoquan Wang Zongqi Liu Nian Liu Jianhua Zhang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Distributed generation (DG), which is interlinked with distribution system, will inevitably have an impact to system. In the paper, a reliability evaluation method is proposed, which is based on the analysis to the structure and power flow of distribution system with distributed generation. First, a new concept, the smallest unit, is put forward for improving the fault traversal networks times. The authors use the depth-first search in data structure to divide distribution system into several the smallest units, and propose the islanding operation mode to increase the reliability of the system. Distribution system will be automatically turned into the islanding operation mode once faults occur. To evaluate quantitatively the reliability of distribution system, Monte Carlo simulation method is used by simulating the running status of distribution system. At last, the calculation results of actual case show that the proposed method is available to evaluate the reliability of distribution system with distributed generation.

关键词： Distributed control power system reliability Switches Load flow Substations National security power system security Topology Data structures power system economics

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Research on adaptive single-pole reclosing technique for EHV/UHV transmission lines

Research on adaptive single-pole reclosing technique for EHV...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Yan Xu Zengping Wang Haofang Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Heibei Province China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding 071003 Heibei Province China

The character of the voltage at the end of the opened phase conductor was studied and an improved voltage criterion was proposed to distinguish between transient and permanent faults. The performance of the improved criterion is hardly influenced by the load currents of healthy phases, transmission line length, fault distance and fault earth resistance. For EHV/UHV lines with shunt reactors, the improved method is also effective when a calculated capacitive coupling voltage is employed. Simulation tests show that the conclusions drawn in this paper are correct.

关键词： Transmission lines Voltage power system transients power transmission lines Inductors Circuit faults Coupling circuits Shunt (electrical) Conductors Frequency

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Research on the control of the single-stage photovoltaic system in Microgrid

Research on the control of the single-stage photovoltaic sys...

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China International Conference on Electricity Distribution, CICED

作者： Peng Li Ling Zhang Yan Wang Yin-Bo Sheng Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding China

Distributed generation in microgrid is mainly composed of new energy and renewable energy resources. The maximum power point of the PV cell array is various from time to time with the change of circumstance and load. The fuzzy control can react to the environment change quickly and keep the photovoltaic system work on its maximum power point all the time. However, the limitation in the fuzzy control itself and the characteristic of self-optimization lead to serious concussion of the system around the maximum power point. Whereas the PID control method is effective in the elimination of concussion and is easy to be realized. To tackle the problem, the fuzzy parameter self-tuning PID control method is adopted in the paper to achieve the MPPT control of PV system. The method can effectively eliminate the concussion around the maximum power point and improve the stability of the whole microgrid; and achieve grid-connected operation with a high power factor in combination with the harmonic elimination PWM control of inverter. Simulation results show that the scheme has merits of simple structure, high power factor and reliable operation, etc. and is worthwhile to be popularized.

关键词： control systems Photovoltaic systems Fuzzy control Three-term control Reactive power Pulse width modulation inverters Distributed control Renewable energy resources Fuzzy systems Stability

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An integrated approach on allocating the congestion management cost under large consumers electricity direct purchase mode

An integrated approach on allocating the congestion manageme...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Yanan Zheng Gengyin Li Ming Zhou Xuanxuan Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

With the start of trial operation of direct purchasing electricity for large consumers in China, the method on how to allocate the wheeling charges of large consumers is of vital theoretical and practical significance. An integrated method for allocating the congestion management cost of larger consumers is presented in this paper considering time-of-use (TOU) pricing in congestion period, power supply reliability and the use capacity of the line. Modeling the TOU index, power supply reliability index and use capacity of the line index is proposed. The weights of three indices are determined by interacting between the transmission utility and large consumers based on multilevel models to get comprehensive evaluation indices for all consumers. The integrated indices are used to allocate the cost. Test results show that the method can allocate the congestion cost more reasonably.

关键词： Energy management Costs Energy consumption power supplies power system modeling Pricing power generation IEEE members Load management power industry

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