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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Zifa, Liu Xing, Liu Key Lab. of Pwr. Syst. Protect. and Dynamic Security Monitoring and Control of Ministry of Education North China Electrical Power University Beijing China

ISBN: (纸本)9781457703638

To deal with reactive power optimization problem, an adaptive Niche Particle Swarm Optimization algorithm (ANPSO) is presented. Differential Evolution algorithm (DE) is easy to use and has the advantages of strong robustness, but its efficiency is limited and probably to fall into local optimum because the population loss of diversity after several generations. ANDE introduces niche-sharing mechanisms to change the individual values and accelerates to eliminate individuals which have low value. Niching radius can also be adjusted adaptively on the basis of the relative distance between individuals which reflect the aggregation of population. Using the above method, algorithm's global searching ability is improved. The proposed algorithm is tested on a realistic planning project and the results show its better performance on celerity, accuracy and efficiency. © 2011 IEEE.

关键词： Reactive power

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Impact of electromechanical coupling on shaft torsional dynamics

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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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Extended power Flow Model of Bus Reactive power Margin and Its Fast Algorithm

Extended Power Flow Model of Bus Reactive Power Margin and I...

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

作者： Ying-yun Sun Yue Guo Guang-yu He Sheng-wei Mei Key Lab. of Power Syst. Protection & Dynamic Monitoring & Control under Minist. of Educ. North China Electr. Power Univ. Beijing China Dept. of Electr. Eng. Tsinghua Univ. Beijing China

The maximum bus reactive power condition is given in the paper, which is deduced from the nature of Jacobian matrix singularity when bus reactive power reaching its limits. The extended power flow equations is also given, and the solution of the equations is just the power flow solution when bus reactive power reaching its limits. A mixed Newton algorithm which based on Broyden row modification is proposed in the paper. To avoid explicit calculating the derivative of the maximum bus reactive power condition, Broyden row modification method is used to approximate it, so the computation burden is deduced significantly. Numerical test in two actual syst.ms and several IEEE test syst.ms show that the proposed method can obtain bus reactive power margin only once extended power flow calculation needed, has fast calculation speed and as robust as QV curve method.

关键词： Load flow Reactive power Voltage power syst.m stability Accidents power syst.m modeling Reactive power control syst.m testing Equations Stability analysis

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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 syst.m

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 syst.ms, 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 syst.m. 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 syst.ms, multivariate statistical analysis theory must also have a good prospect of application.

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

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A Method to Compensate Unbalanced Load on Instant Reactive power Theory

A Method to Compensate Unbalanced Load on Instant Reactive P...

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

作者： Qiao Kun Zhongdong Yin Xiangning Xiao Qipeng Song Key Lab. of Power Syst. Protection & Dynamic Monitoring & Control under Minist. of Educ. North China Electr. Power Univ. Beijing

On the base of generalizing previously research findings, the authors of the paper apply theory of instant reactive power and theory of unbalanced compensation in the controlling of static reactive-power compensation equipments which can increase power factor and compensate three unbalance, thus simplify the algorithm of the instant reactive power. The formulary of compensating reactance is deduced in the condition of unbalanced load. The model of SVC which may compensate unbalanced load is established with PSCAD. The simulation proves availab.lity and feasibility of the method. In view of the aberrance of bus current in the simulation, the paper analysis harmonic content of three-phase. It is also approved feasible of the algorithm in the condition of seriously disturbing by harmonic.

关键词： Reactive power Static VAr compensators power syst.m security Capacitors Inductors Reactive power control control syst.ms PSCAD Circuits Voltage

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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 syst.ms. 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 syst.m show that the proposed estimation method and the identification algorithm work well.

关键词： Electric power syst.ms

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

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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 syst.m 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 syst.m (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 syst.m of China electric power research institute to demonstrate the effectiveness of this criterion.

关键词： Electric power syst.ms

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