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检索条件"机构=Key Laboratory of Power System Protection and Dynamic Security Monitoring Control"

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Available transfer capability assessment considering parameters variety

Available transfer capability assessment considering paramet...

引用

7th IET International Conference on Advances in power system control, Operation and Management, APSCOM 2006

作者： Gao, Yajin Li, Gengyi Zhou, Min 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)0863412467

Available transfer capability (ATC) determines the largest transfer that can be implemented in a certain direction across the power grid without violating security constraints. The uncertainties including load level, aging and maintenance of elements and weather conditions, which have great influence on power system operation should be taking into account when calculating ATC. Considering time-varying nature and uncertainty of system parameters, the time-dependent model is adopted to describe the effects of weather conditions, aging and maintenance on element fault rates. Time-varying restoration time and load are modeled using random variables. The sequential simulation technique is applied to sample the system states, then based on linear programming and DC power flow ATC calculation is proposed. The algorithm based on MATLAB 6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： Linear programming

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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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Approach on detection of reactive and harmonic currents in single-phase circuit

Approach on detection of reactive and harmonic currents in s...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Yu, Han Cui, Zhengpai Li, Sheng Liu, Qihui Long, Yunbo Zhang, Jianhua Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Changping District Beijing 102206 China

ISBN: (纸本)1424401364

This paper presents an approach to the detection of harmonics and reactive currents in single-phase circuit according to the orthogonal characteristic of sine function. The method is simple and practical, which cannot only detect the current component in the distorted current but can also obtain the sum of the active and reactive current. Meanwhile, the presented method possesses fine digital filtering characteristics, and has better qualities in real-time and dynamic response characteristics in comparison with the harmonics detection through the simulated low pass filter. The MATLAB simulation studies illustrate the effectiveness of the proposed method. © 2006 IEEE.

关键词： Low pass filters

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Computation of power line tower lightning surge impedance using the electromagnetic field method

Computation of power line tower lightning surge impedance us...

引用

17th International Zurich Symposium on Electromagnetic Compatibility, 2006

作者： Gao, Changzheng Li, N. Li, Bing Zhao, Zhibin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Under Ministry of Education North China Electric Power University Baoding Hebei 071003 China

ISBN: (纸本)3952299049

The power line tower lightning surge impedance is computed using an electromagnetic field approach. After comparing the results computed by our method and those tested with both a vertical conductor and reduced scale 4-poles model of tower, the method we used is proved to be right and more practical as the soil and the grounding system of the tower can be considered in the method. Using this method, the lightning surge impedance of the full scale UHV tower with grounding system is analyzed and the results show that the lightning surge impedance of a tower on the perfect ground has a little difference with those of an actual tower considering both its grounding system and soil resistivity, and when the soil resistivity is changed, the surge impedance changes slightly. Furthermore, a circuit model of the tower is obtained by Vector Fitting method based on the results we computed. Using the circuit model, the lightning surge performance of a power transmission line can be analyzed more accurately by EMTP or other methods.

关键词： Lightning protection

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Comparison between Hilbert space based power theory and Traditional power theory

Comparison between Hilbert space based power theory and Trad...

引用

2008 Joint International Conference on power system Technology powerCON and IEEE power India Conference, powerCON 2008

作者： Fei, Wang Zengqiang, Mi Qixun, Yang 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)9781424417629

The comparison between Hilbert space based power theory and three other power theories including traditional power theory , instantaneous power theory put forward by Akagi and Fryze power theory are analyzed in this paper. Theconsistency and difference are indicated in several different aspects: physical meaning, mathematical concept and the derivation of expressions. Analyses shows that traditional power theory can be regarded as a special case of Hilbert space based power theory, in other words, Hilbert space based power theory can be regarded as the generalization of traditional power theory. Fryze power theory is in accordance with Hilbert space based power theory in single-phase nonsinusoidal system, instantaneous power theory is in accordance with Hilbert space based power theory in three- phase symmetrical system without zero-sequence component. The definition of active current in Hilbert space based power theory is different from it in instantaneous power theory in three-phase system. © 2008 IEEE.

关键词： Hilbert spaces

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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

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

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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Comparison and verification of load model based on PSASP

Comparison and verification of load model based on PSASP

引用

International Conference on Critical Infrastructure

作者： Wang, Huilin Ma, Jin Zheng, Xiaoyu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China

ISBN: (纸本)9781424480814

In load model verification process, the accuracy of model and its parameters makes the actual operating conditions unable to reappear in simulation. The information deviation between measured data and verifiable simulation data makes it impossible to ensure the descriptive power of measurement- -based load model for real load characteristics. With this problem, the paper applies closed-loop verification approach to this question for the first time. The closed-loop verification approach is common in system identification study but newly used in load model comparison and validation. Two cases based on PSASP are studied in the paper. The object of this study is composite load model and the verification is carried out on a 10-generator, 39-bus New England power system. They both prove the validity of composite load model and the feasibility of this verification approach. © 2010 IEEE.

关键词： 39-bus New England power system PSASP closed loop verification approach closed-loop verification composite load model descriptive power feasibility information deviation load management load model load model comparison load model validation load model verification process measurement based load model power operating conditions power grids real load characteristics

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PCA fault location based on wide area measurement systems

PCA fault location based on wide area measurement systems

引用

2010 5th International Conference on Critical Infrastructure, CRIS 2010

作者： Zhang, Yagang Wang, Zengping Zhang, Jinfang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Baoding 071003 Hebei Province China

ISBN: (纸本)9781424480814

The faults in electric power system can not be completely avoided. When power system operates from normal state to failure or abnormal operates, its electric quantities may change significantly. Our researches indicate that the variable with the biggest coefficient in principal component usually corresponds to the fault. Therefore, utilizing real-time measurements of PMU, basing on principal components analysis technology, we have completed the fault location of electric power system. Of course, because of the complexity of different types of faults in power system, there still exists enormous problems need a close and intensive study. © 2010 IEEE.

关键词： Phasor measurement units

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The perturbed trajectories prediction method based on wide area measurement system

The perturbed trajectories prediction method based on wide a...

引用

IEEE/PES Transmission and Distribution Conference and Exposition

作者： Song, F. F. Bi, T. S. Li, H. Y. Yang, Q. K. Liu, Y. IEEE China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China Beijing Power Company Beijing China

ISBN: (纸本)9780780391932

In this paper, a novel method for perturbed trajectory prediction of post-fault rotor angle is presented based on PMU (phasor measurement unit) measurements and trigonometric function curve fitting technique. A mathematical model about the relationship of post-fault rotor angle and time is derived from a speed-governing system model, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by trigonometric functions. By curve fitting technique, a least square method to predict the perturbed trajectory using trigonometric function is proposed. Numerical simulations are conducted on IIEEE 9-bus system to test the effectiveness of this method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique.

关键词： trajectory predictions rotor angle wide area measurement rolling time window least square method

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