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Advanced control strategy of SVC based on artificial immune algorithm

Journal of Computational Information Systems 2015年第6期11卷 1965-1972页

作者： Chen, Saisai Li, Kejun Jing, Ping Zha, Guoliang Tian, Xin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China Smart Grid Research Institute of State-Grid Changping District Beijing China

For the conventional Static Var Compensator (SVC), there is a contradiction between the response time and system stability. An advanced control strategy is proposed in this paper. Improved Proportional Integral (PI) controller and Artificial Immune Algorithm are adopted in SVC control system, with the response speed of SVC as objective function of optimization. Meanwhile, a non-linear link is added to ensure the stability of the system. The non-linear link is proved that it can significantly improve the stability of the nonlinear system. Simulation results show that the new SVC control strategy can not only track the set voltage value of SVC quickly, but also comprehensively compensate for reactive power and three-phase imbalance. Copyright © 2015 Binary Information Press.

关键词： Static Var compensators

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A risk assessment approach on electrical substation for dispatching operation

A risk assessment approach on electrical substation for disp...

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IEEE Region 10 International Conference TENCON

作者： Guangmin Fan Lingxu Guo Wei Liang Hongtao Qie Dongxu Lu Kai Hou Yuan Zeng Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Dispatching and Control Center State Grid Tianjin Electric Power Company China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Tianjin University Tianjin Tianjin CN

ISBN: (纸本)9781479986422

Based on the fact about self-regions in current power system, a new topology regions method is firstly proposed. Then a new comprehensive risk assessment method on electrical substation for dispatching operation is presented, in which the risk of bus system arrangement and equipment operation state within a substation and the overall topology of a substation during a whole power system are all considered. Finally, the correctness and effectiveness of this method are tested by the utilization in a real power system.

关键词： Substations Topology Risk management Load flow Satellites Power system stability Dispatching

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A distributed feeder automation algorithm and its model checking

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Sensors and Transducers 2014年第1期162卷 325-332页

作者： Ling, Wanshui Liu, Dong Key Laboratory of Control of Power Transmission and Conversion Ministry of Education School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200240 China State Energy Smart Grid R and D Center Shanghai 200240 China

This paper presents a distributed feeder automation algorithm based on local topology, considering switch action failure, communication failures and other confounding factors. This makes higher efficiency of data processing and communication and better maintainability of distribution automation system. The algorithm is described by using PROMELA. And the correctness and security of algorithm are expressed and examined with model checking methods. The results show that the algorithm is correct under conditions of certainty and safe under conditions of uncertainty. © 2014 IFSA Publishing, S. L.

关键词： Model checking

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Design and experimental results of a DC induction heater prototype for aluminum billets

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IEEE Transactions on Applied Superconductivity 2014年第3期24卷

作者： Yang, J. Gao, H. Wang, Y.W. Xu, D.Q. Hong, Z. Jin, Z. Li, Z.Y. Key Laboratory of Control of Power Transmission and Conversion Ministry of Education State Energy Smart Grid R and D Center Shanghai Jiao Tong University Shanghai200240 China

The advantages of dc induction heating in high efficiency and good heating quality have been proved and studied worldwide in past decades. In this paper, a laboratory-scale dc induction heater with iron yoke for aluminum billets is designed and tested in detail. The billet to be heated is placed in the air gap of the yoke and is driven by a motor. The magnetic field in the gap is built up by copper windings with direct currents. The whole heating processes under different conditions are observed. Various surface temperature distributions have been achieved by changing several heating parameters including heating time, rotating speed, and dc magnetic field. Numerical analysis for calculating the heating process is also carried out in a commercial finite-element software. Results show that all the heating parameters will affect the final heating effects. Also, the numerical results agree well with the experimental results. © 2013 IEEE.

关键词： Finite element method

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The gradual optimization of grounding grip corrosion rate forecasting model

The gradual optimization of grounding grip corrosion rate fo...

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2nd International Conference on Materials Engineering and Automatic control, ICMEAC 2013

作者： Yan, Ai Jun Du, Jing Yi Liu, Rui Li, Na Tang, Xiao Hua Liu, Lei Li, Zhi Zong The Ground Engineering Laboratory State Grid Company Shaanxi Power Academy of Sciences Xi'an 71005 China The Key Laboratory of Corrosion and Protection Materials Science and Engineering College Xi'an University of Technology Xi'an 710048 China College of Electrical and Control Engineering Xi'an University of Science and Technology Xi'an 710054 China

ISBN: (纸本)9783037857250

A forecasting model of the gradual optimization algorithm is established to predict substation grounding grip corrosion rate. In this model, according to the "Over Fitting" phenomenon in the neural network limited soil corrosion sample data are randomly combined and the training stops when the training error and validation error are equal. The model of smaller errors will be chosen as the optimal model. As shown in the simulation, the general performance and fitting accuracy from the forecasting model meet requirements. © (2013) Trans Tech Publications, Switzerland.

关键词： Corrosion rate

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The application of voltage direct detection method based on mathematical morphology in distribution network with DG

The application of voltage direct detection method based on ...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Peng Li Wei Wang Hongfen Cui Shuai Wang Xilei Yang Yishu Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China State Grid of China Technology College Jinan Shandong China

Distributed generation (DG) injects new vigor into the power system, but it sometimes brings unfavorable factors influencing the power quality of distribution network. In this paper, the Dynamic Voltage Restorer (DVR) is introduced to the distribution network to improve the power quality. In view of that the detection of voltage compensation is the key factor that influences the effect of voltage compensation, a voltage direct detection method based on mathematical morphology is proposed. Firstly, the positive-sequence voltage with harmonics can be extracted by the instantaneous sequence-component decomposer. And then the harmonics is filtered by mathematical morphology filter. Lastly, the control variable of voltage compensation needed by DVR can be calculated from the voltage direct-detecting algorithm. The simulation results show that this method has the characteristics of favorable accuracy, real-time performance and simplicity, and assures the voltage quality of load side after compensation by DVR.

关键词： Morphology Power quality Power system harmonics Power harmonic filters Active filters Voltage fluctuations Power system dynamics Voltage control Power generation Power system reliability

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A novel approach to eliminate zero-sequence harmonics current

A novel approach to eliminate zero-sequence harmonics curren...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Qipeng Song Zhongdong Yin Chengxi Dai Changyin Zhang Weidong Shang Zhonghua Huang Key Laboratory of Power System Protection and Dynamic Monitoring and Control Ministry of Education University Beijing China Kaifeng Power Supply Corporation Kaifeng China Kaifeng Power Supply Corporation The state grid corporation of China Kaifeng

Zero-sequence harmonics caused by nonlinear loads usually result in high voltage distortion levels throughout the facility, neutral conductor overloading, motor heating, transformer heating, increased losses, and excessive harmonic injection onto the utility supply system. This paper presents a novel method to eliminate zero-sequence harmonics by using Zero-sequence Resister Block (ZRB) and Zig-Zag transformer. Zig-Zag transformer is a special connection of three-phase transformerpsilas windings. The ZRB is also a special connected transformer, whose three windings are wounded in the same core. The ZRB has zero reactance for positive and negative-sequence components but giving three times of self-reactance for zero-sequence reactance. In this paper, an analysis is carried out; simulations and laboratory tests are used to evaluate the performance of the Zig-Zag transformer and ZRB under various system conditions. The simulation and laboratory test results indicate that the combination of ZRB and Zig-Zag transformer as filter is a better and effective way to attenuate the neutral current, which also provides an innovational way to improve power quality.

关键词： Power harmonic filters Heating Laboratories Harmonic distortion Conductors Transformer cores Performance analysis Analytical models System testing Power quality

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The propagation characteristics of electromagnetic wave generated from partial discharges in power transformer by FDTD simulation

The propagation characteristics of electromagnetic wave gene...

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2007 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP

作者： Tang, Zhiguo Li, Chengrong Wang, Wei Wang, Hui Wang, Li Ding, Yansheng Beijing Key Laboratory of High Voltage and EMC Ministry of Education North China Electric Power University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University State Grid Corporation of China 100081 Beijing China Beijing Key Laboratory of High Voltage and EMC School of Electric and Electronic Engineering North China Electric Power University P.O. No.88 Beijing 102206 China

The radiation and propagation of electromagnetic (EM) waves generated from PD caused by the obstruction of main transformer components are studied by FDTD simulation in order to get more information for PD location and diagnosis. Current filament, perfect conductive cylinder and perfect conductive spiral coil models are used to simulate the radiation and the influences of iron-core and transformer coil to the propagation of EM *** results demonstrate dynamic propagation process of EM waves in time order, and prove the correctness of the shortest optical path principle. But the attenuation and distortion of EM waves-especially the first peak amplitude-caused by the obstruction of large solid conductive obstacle like iron-core are quite intensive that it may cause great difficulties to identify exact arriving time position of incident waves coming along the shortest optical path. While the influences of the coil to the propagation of EM waves are so little that HF EM waves can penetrate it in almost linear path. ©2007 IEEE.

关键词： Electromagnetic waves

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The Propagation Characteristics of Electromagnetic Wave Generated from Partial Discharges in Power Transformer by FDTD Simulation

The Propagation Characteristics of Electromagnetic Wave Gene...

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2007 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, vol.1

作者： Zhiguo Tang Chengrong Li Wei Wang Hui Wang Li Wang Yansheng Ding Beijing Key Laboratory of High Voltage & EMC North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China State Grid Corporation of China Beijing China

The radiation and propagation of electromagnetic (EM) waves generated from PD caused by the obstruction of main transformer components are studied by FDTD simulation in order to get more information for PD location and diagnosis. Current filament, perfect conductive cylinder and perfect conductive spiral coil models are used to simulate the radiation and the influences of iron-core and transformer coil to the propagation of EM waves. The results demonstrate dynamic propagation process of EM waves in time order, and prove the correctness of the shortest optical path principle. But the attenuation and distortion of EM waves-especially the first peak amplitude-caused by the obstruction of large solid conductive obstacle like iron-core are quite intensive that it may cause great difficulties to identify exact arriving time position of incident waves coming along the shortest optical path. While the influences of the coil to the propagation of EM waves are so little that HF EM waves can penetrate it in almost linear path.

关键词： Electromagnetic propagation Electromagnetic scattering Character generation Power generation Partial discharges Power transformers Finite difference methods Time domain analysis Electromagnetic radiation Coils

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