《电工电能新技术》
· Introduction ·
· Contents ·
2016.1
2015.12
2015.11
2015.10
2015.9
2015.8
2015.7
2015.6
2015.5
2015.4
2015.3
2015.2
2015.1
2014.12
2014.11
2014.10
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2014.6
2014.5
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2014.3
2014.2
2014.1
2013.4
2013.3
2013.2
2013.1
2012.4
2012.3
2012.2
2012.1
2011.4
2011.3
2011.2
2011.1
2010.4
2010.3
2010.2
2010.1
2009.4
2009.3
2009.2
2009.1
2008.4
2008.3
2008.2
2008.1
2007.4
2007.3
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2007.1
2006
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· Abstracts ·
2016.1
2015.12
2015.11
2015.10
2015.9
2015.8
2015.7
2015.6
2015.5
2015.4
2015.3
2015.2
2015.1
2014.12
2014.11
2014.10
2014.9
2014.8
2014.7
2014.6
2014.5
2014.4
2014.3
2014.2
2014.1
2013.4
2013.3
2013.2
2013.1
2012.4
2012.3
2012.2
2012.1
2011.4
2011.3
2011.2
2011.1
2010.4
2010.3
2010.2
2010.1
2009.4
2009.3
2009.2
2009.1
2008.4
2008.3
2008.2
2008.1
2007.4
2007.3
2007.2
2007.1
2006
2005
2004

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《电工电能新技术》2016年第1期目录
第35 卷第1 期(总第151 期)  2016 年1 月
目  次

论文报告
IRP 理论和IEEE Std 1459⁃2010 在变流器驱动电机能效测试中的应用比较
 ...

  Abstracts

2015.4
  日期:2015-05-11     【背景色 杏仁黄 秋叶褐 胭脂红 芥末绿 天蓝 雪青 灰 银河白(默认色) 】  【字体:
 

Novel method of locating cable fault in DC distribution
based on Prony algorithm
XU Ming⁃ming1,2,3, XIAO Li⁃ye1,2, WANG Hai⁃feng, LIN Liang⁃zhen1,2
(1. Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences, Beijing 100190, China;
2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. North China Electric Power University, Beijing 102206, China)
Abstract: When short circuit fault or single⁃pole⁃to⁃ground fault occurs in the DC distribution system, the fault
section will be isolated immediately by DC circuit breaker. To restore the power supply quickly, it is necessary to
find out the fault point as soon as possible. Based on the features of DC distribution lines in transient process, the
RL model is applied to analyze the fault loop. This paper proposes to put a capacitor with initial voltage into the ter⁃
minal of the fault section to form a second order circuit. The characteristic frequency and decaying coefficient of the
capacitor discharging current reflect the parameters of the fault loop. The Prony algorithm is used to withdraw the
characteristic frequency and decaying coefficient of the capacitor discharging current. The fault distance is further
calculated with the parameters of the fault loop. Two⁃end measurement is carried out to eliminate the inductance, a⁃
voiding the errors caused by the non⁃uniform distribution of line inductance. A simulation is carried out in the Sim⁃
ulink/ Matlab environment and the results verify the accuracy of the fault location algorithm.
Key words: DC distribution system; fault location; Prony algorithm

Static bifurcation analysis on natural circulation inner evaporative cooling
system in wind turbines
LI Wang, WANG Hai⁃feng, GU Guo⁃biao
(Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China)
Abstract: Self⁃circulation inner evaporative cooling system (SCIECS) has the following advantages: self⁃circula⁃
tion without pump, high cooling efficiency, safe and reliable operation, and basically maintain free, etc. It is very
suitable for application in the field of wind power. The stability of SCIECS is very important to the safe operation of
wind turbines. So far, there is no nonlinear analysis on the stability of SCIECS. In this paper, based on the nonlin⁃
ear bifurcation analysis theory and its DERPAR numerical computation method, static stability of the SCIECS in
wind turbines is deeply studied. The authors acquired the static bifurcation diagram and analyzed the nonlinearity
nature of SCIECS. At last, in allusion to the special applications in wind turbine, parametric effect of SCIECS is
studied, providing theoretical reference for the optimal design and safe operation of SCIECS.
Key words: wind turbine; inner evaporative cooling system; two⁃phase natural circulation; static bifurcation; par⁃
ametric effect

Comparison of maximum power point tracking techniques
for photovoltaic array under partial shade conditions
LIANG Xiao⁃li, QI Jun, ZHANG You⁃bing, XIE Lu⁃yao
(College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China)
Abstract: Many maximum power point tracking (MPPT) methods suitable for partial shade conditions have been
proposed in recent years, which are called multi⁃peak MPPT methods. Their tracking performance differs greatly
from each other in different applications. Also, there is no uniform standard to evaluate the performance of multi⁃
MPPT methods in complex shade conditions. However, the low⁃knowledge of multi⁃MPPT methods remains a barri⁃
er to choose and apply MPPT methods. The basic principles of multi⁃peak MPPT methods are illustrated briefly
based on reading and summarizing of many literatures. Their accuracy and dynamic power oscillation under plenty
partial shade cases are analyzed through Matlab simulation. As results, static tracking performance, dynamic track⁃
ing performance and MPPT efficiency of multi⁃peak MPPT methods are summarized. These works are helpful to en⁃
gineers who devote to PV power engineering to well⁃understand latest MPPT methods and their performance, and
provide advice to choose MPPT methods and advance MPPT efficiency in practical application.
Key words: partial shade; photovoltaic (PV) array; multi⁃peak maximum power point tracking ( multi⁃peak
MPPT); tracking accuracy; power oscillation

Method of voltage sag state estimation based on generalized inverse matrix
WANG Jia⁃xing, YANG Hong⁃geng, WANG Ze, HAN Fei
(School of Electrical and Information, Sichuan University, Chengdu 610065, China)
Abstract: A new method of voltage sag state estimation based on the generalized inverse algorithm is presented in
this paper. To combine traditional stochastic fault point method and analytic method, voltage state estimation equa⁃
tion is obtained. And it overcomes the blindness of traditional stochastic fault point method to select fault point loca⁃
tion with a decrease in the amount of calculation and evaluation as well as guaranteeing the accuracy of the estima⁃
tion. And by using the generalized inverse algorithm to solve the underdetermined equations accurately and relia⁃
bly, relative to the integer linear programming and genetic algorithm, the method needs no iteration, and there is
no convergent problem, so it needs less time to calculate. In addition, because the algorithm itself has no parameter
constraint problem, it overcomes the shortcomings of selecting genetic algorithm parameters in the process of cross⁃
over and mutation depending on human experience. The proposed estimation method has been validated by using
the IEEE 30 test system and the results obtained have been very satisfactory. The proposed method is applicable to
voltage sag state estimation in any size grids when symmetric and asymmetric faults occur.
Key words: voltage sag state estimation; stochastic fault point method; analytical method; genetic algorithm; gen⁃
eralized inverse

Research of frequency characteristics in wireless power transfer
system via magnetic resonance coupling under interference factors
XUE Ming, YANG Qing⁃xin, LI Yang, ZHANG Xian
(Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology,
Tianjin Polytechnic University, Tianjin 300387, China)
Abstract: Based on mutual inductance model, this paper obtains a simplified model, with which the relationship
between load receiving power and system transmission power is obtained as the transfer distance of the system is in⁃
fluenced by the disturbance of coupling angle and horizontal offset between the transmitter and receiver. In order to
verify the correctness of the theoretical analysis, a test sample is produced. Taking the maximum load received
power and the maximum transfer efficiency as targets, with frequency tracking to wireless power transfer system, the
paper obtains the range of variation of the system operating frequency. This study also provides the basis for re⁃
search on robustness of frequency of the magnetic coupling resonance based wireless power transfer system.
Key words: wireless power transmission; resonance coupling; maximum efficiency; frequency

Research on temperature field of air core power reactor based on
all losses calculation
YAN Xiu⁃ke, DAI Zhong⁃bin, YU Cun⁃zhan, XIE De⁃xin
(1. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China;
2. Henan Pinggao Electric Co. Ltd. , Pingdingshan 467001, China;
3. Maintenance Branch Company, Liaoning Electric Power Co. Ltd. , Shenyang 110003, China)
Abstract: To research the local overheated problem of air core power reactor, the 2D and 3D magnetic fields of air
core reactor have been analyzed using FEM in this paper. Based on the magnetic field distribution, all losses in air
core reactor have been computed. The losses comprises the losses in windings and eddy current losses in connection
arm truss, in which the losses in windings include resistance losses and eddy current losses in windings. Taking all
losses as thermal sources, combining with dispersion conditions, the fluid⁃thermal field coupling model of air core
reactor has been established. The temperature distribution of each package can be obtained by 2D and 3D fluid⁃
thermal field coupling calculation. The comparison between results shows that the connection arm truss and sustain⁃
ing bars have influence on temperature and on the hottest position of air core reactor. It is necessary for reactor de⁃
sign to research 3D fluid⁃thermal coupled field considering all losses and all cooling conditions.
Key words: air core reactor; losses; thermal sources; fluid⁃thermal coupled field

Parameter calculation for equivalent circuit of oil⁃paper insulation
based on interval⁃particle swarm optimization algorithm
LI An⁃na, CAI Jin⁃ding, GAN Lu, ZENG Jing⁃lan
(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China)
Abstract: Recovery voltage method (RVM) is an approach of non⁃destructive measurement for diagnosing insula⁃
tion of power transformer. At the present stage, in order to analyze the polarization properties of the medium in the⁃
ory, the scholars build equivalent circuit models to analyze oil⁃paper insulation aging mechanism. Therefore, the
accuracy of equivalent circuit parameters plays a crucial role in the follow⁃up study of aging oil⁃paper insulation.
The paper establishes a mathematical model with the data of initial slope of return voltage for solving parameter of
dielectric response equivalent circuit, which is simple, and easy to operate. Considering charging voltage error and
measurement error, the paper firstly adopts Interval⁃Particle Swarm Optimization Algorithm (I⁃PSO) to calculate
model parameters. I⁃PSO has higher execution efficiency and better optimization performance in high⁃dimensional
model. Finally, simulation experiment results have shown the accuracy of equivalent circuit and the effectiveness of
this algorithm. The results of this study have laid a good foundation for further evaluation of oil paper insulation ag⁃
ing.
Key words: recovery voltage; interval⁃particle swarm optimization algorithm; parameter calculation; equivalent
circuit

FFT algorithm of dielectric loss angle measurement based on
correlation Blackman window
SUN Peng, YANG Yong⁃yue
(School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China)
Abstract: In on⁃line monitoring dielectric loss angle of high voltage electric equipment, the FFT algorithm brings
significant errors because of asynchronous sampling and the truncation of power systems frequency signal. In this
paper, leakage effect of FFT algorithm caused by asynchronous sampling is analyzed, a FFT algorithm of dielectric
loss angle measurement based on correlation Blackman window is presented. Firstly, the power systems current and
voltage signals are weighted by the correlation Blackman window. Then, the fundamental phase angles are calculat⁃
ed with spectral phase difference correction method. Lastly, the dielectric loss angle is calculated by the phase
difference of the fundamental current and voltage. The simulation results show that the proposed algorithm can ef⁃
fectively overcome dielectric loss angle measurement errors because of asynchronous sampling and the truncation of
power systems frequency signal, and improve measurement accuracy of dielectric loss angle greatly under such con⁃
ditions as power systems signal frequency fluctuation and higher harmonics.
Key words: dielectric loss angle; FFT; asynchronous sampling; leakage effect; correlation Blackman window;
spectrum correction

Characteristics of induced current on ground wire and reradiation
interference resonance from power line at MF
TANG Bo, CHEN Bin, ZHANG Yi, BAI Yong⁃xiang, QU Zi⁃hang
(1. College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China;
2. Henan Sanmenxia Power Supply Company, Sanmenxia 472000, China)
Abstract: Currently, the research of reradiation interference resonance from the UHV power line mainly quotes the
IEEE conclusion. However, the IEEE conclusion can be only applied to the frequency below 1􀆰 7MHz. For the
case of power tower connected with ground wire, the predicting conditions of interference resonance are drawn from
the characteristics of induced current on ground wire according to IEEE. The research model proposed by IEEE is
excited by the wire antenna and the vertical polarization plane wave. Based on the wire electric field integral equa⁃
tion and MOM, the induced current and the interference value are calculated and analyzed. The results show that,
the IEEE conclusion, in which induced current is the impact factor of reradiation interference below frequency of
1􀆰 7MHz, is validated, while the accuracy of ‘the N⁃wavelength loop resonance frequency’ is limited.
Key words: power line; reradiation interference; resonant frequency; induced current; MOM; MF

Research and experiment for fault line detection in non⁃solidly
grounded system using multi⁃criteria combination
ZHANG Guo⁃jun, HAN Jing⁃jing, REN Rong, TIAN Yong⁃feng
(School of Electrical and Control Engineering, Liaoning Technical University, Huludao 125105, China)
Abstract: This paper analyzes the character of the zero sequence and negative sequence current when single⁃phase
fault occurs. The problem of faulty line selection of single⁃phase grounded transmission line for small current neutral
grounding systems is still not well solved. Previous single line selection method has some limitations, and the fault
line is not used for the benefit of fault line selection information, so the sensitivity and reliability of faulty line selec⁃
tion is not high. According to the line selection methodology the favorable fault line selection data are utilized, fuzz⁃
y set theory is therefore introduced and applied in faulty line detection in this paper to combine different kinds of the
fault information, forming a line selection method using the combination of multi⁃criteria. Under laboratory condi⁃
tions the simulation is performed, and the results show that the power system line selection method is accurate, and
it can be applied to complex small current grounding system failure. Key words: small current grounding system; faulty line selection; fuzzy theory; multi⁃criteria fusion

Identification of disturbance signals based on wavelet boundary descriptors
and dynamic time warping
WU Jie, LV Chun⁃mei, CUI Biao
(School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China)
Abstract: A novel algorithm based on the wavelet boundary descriptors and the dynamic time warping was proposed
for improving the accuracy of voltage disturbance classification. In this algorithm, firstly, wavelet is used in feature
extraction of those disturbances; and then, according to the definition of wavelet boundary descriptors, the wavelet
boundary descriptors are constructed on the basis of Mallat algorithm. Secondly, it calculated distance matrix be⁃
tween testing and seven kinds of reference disturbances, then DTW is used to search the optimum path which needs
to be the shortest in every distance matrix to guarantee that the testing signals have the most resemblance with refer⁃
ence signals. Finally, it selects the shortest path as classification result. Without extraction of the disturbance sig⁃
nals, this method makes the recognition process simple. Moreover, this method has solved the problem, that
caused the misjudgment in the case of obvious and short disturbance signal, like the voltage flicker and impulse
transient. A simulation was done in Matlab. The simulation results showed that this method can recognize the dis⁃
turbance signals quickly and effectively.
Key words: power quality; disturbance recognition; dynamic time warping; Mallat algorithm; wavelet boundary
descriptors

Investigation on parameters design of overvoltage damper
for shunt capacitor device
WU Xi⁃xiu, DENG Lei, WU Shi⁃pu, LONG Fei, WEI Mei⁃fang
(1. School of Automation, Wuhan University of Technology, Wuhan 430070, China;
2. China Electric Power Research Institute, Wuhan 430074, China;
3􀆰 712th Research Institute, China Ship Building Industry Corporation, Wuhan 430064, China;
4. Central Training Department, Hunan Electric Power Company, Changsha 410131, China)
Abstract: The working principle of a damper which can retrain the overvoltage caused by shunt capacitor is ana⁃
lyzed. The calculation procedure of choosing the optimum resistance and the method of estimating the breakdown
voltage of the gap are discussed in detail. Firstly, mechanism of overvoltage generation and its influence factors are
investigated. Then the requirements, under which the largest overvoltage occurs when operating capacitor, are ob⁃
tained. Based on this, the conditions for putting the damper into operation and the method to calculate the best
damping resistance are presented. After obtaining the optimum damping resistance value, the simulation of circuit
model equipped with optimum damping resistance is built, the relationship between capacitor overvoltage times and
gap breakdown voltage is calculated, and then we get the breakdown voltage range. According to this designed
method, the authors have designed a set of three phase shunt capacitor device for 110kV power system in one sub⁃
station in Kyrgyzstan, and the field operation shows that this damper has significant function on suppressing over⁃
voltage of shunt capacitor device, proving that the design is valid.
Key words: shunt capacitor device; overvoltage damper; optimum damping resistance; gap breakdown voltage

Novel design of coupled inductor applied on bidirectional DC / DC converter
YANG Yu⁃gang, YE Jing⁃yuan, LI Hai⁃guang, MA Jie
(Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao 125105, China)
Abstract: In this paper, the proposed ‘I 王I’ coupled inductor overcomes the disadvantages of existing energy
storage inductor’s complex structure, such as bigger magnetic pass loss, and nonuniform distribution of magnetic
pressure, and makes magnetic pressure distribution more uniform by increasing the quantity of magnetic circuit’s
air gap. Compared with traditional ‘EE’ and ‘EI’ core inductors, ‘I 王I’ significantly decreases the electromag⁃
netic loss of magnetic circuit, electromagnetic interference and eddy current loss of coil, as well as reduces the
height of coil structure effectively which can increase the field angle of magnetic circuit and improve magnetic cir⁃
cuit structure, and also increases the window area. Through the analysis of coupled inductor flux distribution, the
paper establishes magnetic circuit model and provides the design method of coupled inductor, then verifies the fea⁃
sibility of the ‘I 王I’ coupled inductor structure through simulation and experiment of bidirectional DC/ DC con⁃
verter.
Key words: ‘I 王I’ coupled inductors; magnetic circuit model; magnetic flux loss; bidirectional DC/ DC convert⁃
er

 


 
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