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Impact of electromechanical coupling on shaft torsional dynamics

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2010年第4期30卷 49-55页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Peng, Qian Key Lab. of Power System Protection and Dynamic Security Monitoring and Control Ministry of Edu. North China Electric Power University Beijing 102206 China State Nuclear Electric Power Planning Design and Research Institute Beijing 100094 China

The electromechanical coupling model is employed to define the all-mode shape and torsional mode shape, and deduce the linear solutions of torques. Based on the solutions of torques, mode shapes of torques and mode contribution factors of torques are defined. The above physical concepts can directly describe shaft torsional dynamics, and get more insights than the mode shapes previously defined. Moreover, the theoretical basis and the physical implications of free vibration and forced vibration models are analyzed in detail. In light of the difference between the electromechanical coupling model and the free vibration model, the deviations between the calculated and measured values are explained for mode shapes and natural torsional frequencies. The difference between the dynamics of the electromechanical coupling and forced vibration models is analyzed as well. © 2010 Chin. Soc. for Elec. Eng.

关键词： Electromechanical coupling

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Study on Field-Circuit Coupling Model of Saturated Reactor Based on Finite Elements Theory

Study on Field-Circuit Coupling Model of Saturated Reactor B...

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International Conference on Energy and Environment Technology (ICEET)

作者： Ziqiang Wang Zhongdong Yin Lan Wu Ning Kong Miaomiao Wang Zhijian Wang Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control North China Electr. Power Univ. Beijing China

The saturated reactor can changes the reactance of AC winding by changing magnetic field working states and magnetic properties of the core which is affected by DC excitation and the magnetic saturation. In this paper, aiming at a saturated reactor prototype, mathematical analyses and derivations for the magnetic field within the core are studied. Then, the field-circuit coupling mathematical model is established based on the finite element analysis theory. Furthermore, using the finite element analysis software ANsys. the precise 2-D prototype field-circuit coupling model is established, which directly coupled the magnetic field equations and the circuit equations together, and it can reflects the electromagnetic transient process.

关键词： Inductors Finite element methods Magnetic fields Coupling circuits Magnetic cores Software prototyping Magnetic analysis Electromagnetic coupling Equations Magnetic properties

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Fault Diagnosis Based on Cluster Analysis Theory in Wide Area Backup protection sys.em

Fault Diagnosis Based on Cluster Analysis Theory in Wide Are...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Yagang Zhang Jing Ma Jinfang Zhang Zengping Wang Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control under Minist. of Educ. North China Electr. Power Univ. Baoding

In wide area backup protection of electric power sys.ems, the prerequisite of protection device's accurate, fast and reliable performance is its corresponding fault type and fault location can be discriminated quickly and defined exactly. In our researches, global information has been introduced into the backup protection sys.em. By analyzing and computing real-time PMU measurements, basing on cluster analysis theory, we are using mainly hierarchical cluster analysis technology to seek after for the statistical laws of electrical quantities' marked changes. Then we carry out fast and exact identification of faulty components and faulty sections, and finally accomplish fault isolation. Multivariate statistical analysis theory is an efficient theory that can resolve different kinds of complex problems. It has been applied successfully in many researches of various fields, such as geology, weather, hydrology, iatrology, industry, agriculture, and economy, etc. In the study of electric power sys.ems, multivariate statistical analysis theory must also have a good prospect of application.

关键词： Fault diagnosis power sys.em protection power sys.em reliability Statistical analysis Fault location power sys.em analysis computing Phasor measurement units Electric variables measurement Isolation technology Geology

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Assessment of power Marketing Services Management Based on Value Engineering

Assessment of Power Marketing Services Management Based on V...

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International Conference on Energy and Environment Technology (ICEET)

作者： Lan Wu Zhongdong Yin Ziqiang Wang Sch. of Bus. Manage. North China Electr. Power Univ. Beijing China Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control of Minist. of Educ. North China Electr. Power Univ. Beijing China

The value engineering services was applied in cost-effective research on power marketing service management, and carried on some power company's service case. The method combines technology, economics and management to analysis problems, which is a new emerging branch of service science. The case studied in the paper showed that the value engineering services employed solved effectively the cost-effective problems of the power marketing activities. Not only what value engineering is were introduced in the paper, but also how to use. Consequently, the solution through the method is vitally practical; it would be valuable in strategies-making for workers related.

关键词： Energy management Marketing management Engineering management power engineering and energy Cost function Technology management Conference management Environmental management power generation economics Information analysis

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Study on Magnetic Circuit Structure of Magnetic Valve controllab.e Reactor Based on ANsys

Study on Magnetic Circuit Structure of Magnetic Valve Contro...

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International Conference on Energy and Environment Technology (ICEET)

作者： Ziqiang Wang Zhongdong Yin Zhengyu Xie Key Lab. of Power Syst. Protection & Dynamic Security Monitoring & Control of Minist. of Educ. North China Electr. Power Univ. Beijing China Propaganda Dept. of Party Comm. Hebei Univ. of Sci. & Technol. Shijiazhuang China

The core cross section area of magnetic valve controllab.e reactor has a reduced section. By changing the saturation degree of the cross section area, the capacity of the reactor can be changed. In this paper, focusing on a new type of magnetic valve controllab.e reactor prototype, the precise 2D field-circuit coupling model of the prototype is established in the finite element analysis software ANsys. Based on this model, the magnetic state within the core is studied under the combined effects of AC and DC. The theoretical analyses and simulation results show that the analyzed 2D field-circuit coupling model can reflects the actual reactor transient electromagnetic process accurately.

关键词： Magnetic circuits Valves Inductors Saturation magnetization Magnetic analysis Magnetic cores Software prototyping Electromagnetic modeling Electromagnetic analysis Electromagnetic coupling

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Flow transferring identification algorithm for multi-branches removal event with consideration of transient phenomena

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 24-30页

作者： Xu, Hui-Ming Bi, Tian-Shu Huang, Shao-Feng Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

Cascading trips caused by flow transferring are the crucial causation of a lot of well-known blackouts. It severely threatens the security and reliability of power sys.ems. Flow transferring relativity factor (FTRF) is extended from single branch removal event to multi-branches removal event. According to refraction and reflection process of flow transferring, the calculation formula of FTRF for multi-branches chain removal event is deduced. Moreover, by using the relationship of node injection currents and branch currents, a method of post-fault branch current estimation and a flow transferring identification algorithm based on WAMS to distinguish flow transferring in transient period is presented. The simulation results of 10-generator 39-bus New England sys.em show that the proposed estimation method and the identification algorithm work well.

关键词： Electric power sys.ems

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Multi-swing stability assessment approach based on variation rate of transient energy for power sys.ems

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2007年第16期27卷 13-18页

作者： Song, Fang-Fang Bi, Tian-Shu Yang, Qi-Xun Key Lab. of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The lack of quantitative stability analysis software for power sys.em is one of the main reasons for losing good chance to implement the emergency control and even finally resulting in the large outage. Recently, the rapidly developing wide area measurement sys.em (WAMS) gives a new way for quick on-line quantitative transient stability assessment. Starting with the single machine energy function, the relationship between the variation rate of transient unbalance energy and multi-swing stability was analyzed in detail, and the corresponding characteristic of the variation rate of transient energy was proved. Then, a new multi-swing stability assessment criterion based on WAMS was proposed. Numerical simulations were conducted on 6-machine 22-bus sys.em of China electric power research institute to demonstrate the effectiveness of this criterion.

关键词： Electric power sys.ems

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Sensitivity analysis for AC/DC hybrid power sys.ems

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Dianli Xitong Zidonghua/Automation of Electric power sys.ems 2007年第12期31卷 45-49页

作者： Liu, Chongru Zhang, Boming Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China State Key Lab. of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

The interactions between AC and DC sys.ems in the steady-state condition of power sys.ems are investigated. Through a sensitivity analysis, the influence of DC control parameters on the operation of AC/DC sys.ems and that of AC control parameters on other AC parameters with the DC sys.em existing are discussed. The sensitivity matrices and the influence factors between AC and DC sys.ems are analyzed from various points of view. The sensitivity analysis made in this paper is expected to be of practical significance in such problems as load flow control, parameter regulation, voltage estimation, etc.

关键词： Electric power transmission networks

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A practical approach for ride through of super capacitor energy storage based ASD sys.em

A practical approach for ride through of super capacitor ene...

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IEEE/PES Transmission and Distribution Conference and Exposition

作者： Yin, Zhongdong Han, Minxiao Du, Yunlong Zhang, Zheran Key Lab. of Power Sys. Protection and Dynamic Security Monitoring and Control Ministry of Education 102206 China

ISBN: (纸本)9780780391932

A practical ride through scheme bases on super capacitor energy storage sys.em for ASD (Adjustable Speed Drive) equipment is presented in this paper. The topology of ASD discussed adopts AC-DC-AC structure and 12 pulses diode rectifier as input interface. Super capacitor (SC) module connects to inverter DC bus to support DC voltage while power quality problems such as voltage sag or short-term outage take place in power source. A SC energy storage sys.em based 15kVA ASD prototype was developed. Digital simulation and physical experiments were carried out to verify the correctness and validity of proposed ASD ride through topology and control strategies.

关键词： adjustable speed drive power quality ride through super capacitor

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Novel decentralized approach through optimal resource allocation for congestion management

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2006年第22期26卷 46-53页

作者： Liu, Kai Zhao, Da-Pu Hou, Yun-He Bi, Tian-Shu Ni, Yi-Xin Wu, Felix Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong Hong Kong Department of Electric Engineering Tsinghua University Beijing 100084 China Key Power System Lab. Shenzhen Research Institute Shenzhen 518055 China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Beijing 102206 China

The paper proposed a novel decentralized approach for congestion management via Optimal Resource Allocation (ORA) for the forward markets. The availab.e capacities of possible congested transmission lines are considered as commonly shared resources for bilateral and multilateral transactions in the market. Each transaction maximizes its profit using limited capacity of transmission line allocated by the ISO. Through the proposed decentralized optimization algorithms, the ISO searches the optimal allocation of the capacities of congested transmission lines to the individual transactions and finally the same market efficiency (social welfare) as centralized optimization is achieved. This decentralized approach is more suitable for power market environment since it does not require private and sensitive information submission from individual transactions to the ISO and the resource allocation decision is always feasible during iterations. The mathematical model, calculation procedure and relevant proof are presented. The computer test results from the IEEE 30 bus sys.em show clearly the effectiveness of the approach and its consistency with the centralized optimization.

关键词： Resource allocation

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