《电工电能新技术》
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2016.1
2015.12
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2015.1
2014.12
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2013.1
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2011.1
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2010.1
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· Abstracts ·
2016.1
2015.12
2015.11
2015.10
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2015.1
2014.12
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2014.1
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2013.1
2012.4
2012.3
2012.2
2012.1
2011.4
2011.3
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2011.1
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2010.2
2010.1
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2009.3
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2009.1
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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
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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
 ...

  2014.8

2014.8
  日期:2014-09-17     【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:
 

Cycle efficiency evaluation method of multi⁃stage RCAES system
LIU Bin, CHEN Lai⁃jun, MEI Sheng⁃wei, WANG Jun⁃jie, WANG Si⁃xian, FANG Chen
(1. State Key Lab of Control and Simulation of Power Systems and Generation Equipment,
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China;
2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences,
Beijing 100190, China; 3. Electric Power Research Institute, State Grid
Shanghai Municipal Electric Power Company, Shanghai 200437, China)
Abstract: Due to the uncertainty and anti⁃peaking nature, integration of large scale renewable energy brings great
challenges to the operation and dispatch of power systems. CAES (Compressed Air Energy Storage) system pro⁃
vides new ideas to solve this problem as its characteristics of fast regulating, flexible location and long service life.
Especially, RCAES (Regenerative Compressed Air Energy Storage) system is widely concerned as its repurposing
of the heat released in the compression process. The efficiency of energy conversion is a key indicator of RCAES
system. However, current research mostly focuses on the thermodynamic process and few works has been done on
the efficiency analysis of the whole RCAES system. Based on the electrical⁃mechanical⁃thermal dynamic process
and with measurable parameters, we present an efficiency evaluation method of RCAES system in this paper. A
typical RCAES design scheme is studied to illustrate and validate the effectiveness of the proposed method.
Key words: RCAES; efficiency evaluation; heat recovery system; energy conversion

Power capacity analysis of ICPT system based on U⁃magnetic core circuit
XIA Chen⁃yang, JIA Na, ZHUANG Yu⁃hai
(School of Information and Electrical Engineering, China University of Mining
and Technology, Xuzhou 221116, China)
Abstract: ICPT is a new mode of power transfer developed in recent years. And it has attracted more and more at⁃
tention of scholars at home and abroad and has been widely used. In order to assure the maximal power transfer of
the magnetic coupling circuit, this paper analyze the capacity of power transfer for framework of U⁃magnetic core
magnetic circuit from the point of magnetic circuit view. At the same time, the relationship between power transfer
ability and the framework of magnetic core, position of primary guide way, the working frequency as well as the
number of turns of secondary is given. Then, optimization design of magnetic circuit for the U⁃magnetic core archi⁃
tecture is given. Finally, this criterion is justified via an experiment.
Key words: ICPT; U⁃magnetic core; power transfer capacity; magnetic circuit optimization

UPQC for dynamically adjusting voltage sag compensation depth
WANG Hao1,2, LIU Jin⁃jun, MEI Gui⁃hua
(1. Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080, China;
2. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
Abstract: Traditional MMC⁃UPQC uses series transformers with constant transformation ratio structure, which cau⁃
ses a constant maximum voltage sag compensation depth and the series converter cannot utilize its full rated capacity
to compensate the voltage sag when the feeder load does not reach its rated capacity. A novel MMC⁃UPQC is pro⁃
posed to fully utilize the rated capacity of the series converter and increase the voltage sag compensation depth of the
MMC⁃UPQC, in which multi⁃winding transformer and bidirectional switches are used. Voltage sag compensation ca⁃
pability of the traditional MMC⁃UPQC and the novel MMC⁃UPQC are analyzed, which points out the advantage on
changing the transformation ratio of the series transformer. Simulations based on the traditional MMC⁃UPQC and the
novel MMC⁃UPQC are done and the simulation results verify the effectiveness of the novel MMC⁃UPQC. Compared
with the traditional one, novel MMC⁃UPQC can piecewise dynamically adjusts voltage sag compensation depth and
increases the voltage sag compensation capability when the feeder load does not reach its rated capacity without in⁃
creasing the rated capacity of the MMC⁃UPQC.
Key words: unified power quality conditioner; voltage sag; compensation depth; modular multilevel converter

Study of hybrid compensation scheme based on TCSC
damping sub⁃synchronous oscillation
CHEN Tian⁃mei, XIAO Xiang⁃ning
(School of Electric and Electronic Engineering, North China Electric Power University, Beijing 102206, China)
Abstract: A novel hybrid thyristor controlled series compensation (HTCSC) scheme for damping the sub⁃synchro⁃
nous oscillation is studied. In HTCSC structure, TCSC device is connected to single phase and the other two phases
use only the fixed compensation capacitor. Under basic power frequency, the three phase impedance is equal;
while under sub⁃synchronous frequency, impedance of three phase is unequal, thus the three⁃phase current is im⁃
balance, which can weaken the coupling between generator and electrical system and inhibit SSO to a certain ex⁃
tent. Compared with three⁃phase TCSC, the new structure reduces number of thyristor by 2/3, and lowers the de⁃
vice cost and control difficulty. Synchronous voltage reversal (SVR) method is used as the control strategy and a
supplementary active damping controller is designed. The simulation result shows that with the active damping con⁃
troller based on SVR, HTCSC can effectively suppress the sub⁃synchronous oscillation caused by unreasonable line
compensation degree. Moreover, the steady⁃state value of line voltage unbalanced rate under HTCSC scheme after a
short⁃circuit fault can meet the requirements of national standard.
Key words: hybrid thyristor controlled series compensation; sub⁃synchronous oscillation; synchronous voltage re⁃
verse method; supplementary damping controller; line voltage unbalance rate

Research on model predictive control of three⁃phase grid⁃connected converter
HAN Jin⁃gang, YANG Teng⁃fei, SHI Yu, TANG Tian⁃hao
(Department of Electrical Automation, Shanghai Maritime University, Shanghai 201306, China)
Abstract: In recent years, three⁃phase grid⁃connected converters are becoming more and more popular in the field
of renewable energy. In order to improve the grid performance of renewable energy generation systems, a variety of
new grid⁃connected control strategies have been proposed. Model predictive control method uses a discrete⁃time
model of the system to predict the future value of the load current for all possible voltage vectors generated by the
converter. The voltage vector which minimizes a cost function is selected and used at the next sampling instant.
This paper presents a model predictive current control algorithm for power converters based on a three⁃phase grid⁃
connected voltage source converter. A TMS320F28335 floating⁃point DSP is used for the experimental platform.
The steady⁃state and dynamic performance of the grid⁃connected current is investigated with the compensation in the
reactive power. Simulation and experimental results validate the superiority in three⁃phase grid⁃connected area of
the proposed model predictive control method.
Key words: model predictive control; current control; voltage source converter; grid⁃connected converter

Improved Pseudo⁃Boost converter with elimination of voltage spike
HAN Hui⁃hui, XU Jian⁃ping, CHEN Zhang⁃yong
(School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China)
Abstract: Under both positive and negative input voltage, the output voltage of Pseudo⁃Boost converter is positive,
i. e. Pseudo⁃Boost converter has bipolar voltage gain, which makes it acting as a bridgeless PFC converter. For the
Pseudo⁃Boost converter, when the switch is turned off, boost inductor is connected in series with resonant inductor,
which makes a step change of inductor current, and thus produces a serious voltage spike. This voltage spike may
limit the application of Pseudo⁃Boost converter. In this paper, to eliminate the voltage spike at the time when the
switch is turned off, an improved Pseudo⁃Boost converter is proposed by connecting a switch in parallel with the res⁃
onant inductor. Experimental results are provided to verify the theoretical analysis results. Furthermore, the scheme
can be applied to both continuous conduction mode and discontinuous conduction mode. Key words: Pseudo⁃Boost converter; critical conduction mode (CRM); inductive current; voltage spike

Research of Lithium battery formation bidirectional AC / DC converter
ZHANG Yao, CHEN Xi⁃Kun, YANG Sheng
(Shool of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200072, China)
Abstract: With the rapid development of power for the lithium battery formation, the problem of the formation con⁃
trol system of traditional lithium⁃ion batteries caused a lot of energy waste and pollution to power network is increas⁃
ingly prominent, and the research of the efficient lithium battery formation equipment is becoming more and more
important. In light of this problem, this dissertation proposed a lithium battery formation bidirectional AC/ DC con⁃
verter. The converter uses an improved form of voltage type PWM rectifiers and half bridge bidirectional DC/ DC to⁃
pology combination, and uses the MPC5604B of the new generation of Freescale microcontroller as the core control
chip and the voltage and current double closed⁃loop control algorithm to achieve the energy efficient two⁃way flow of
lithium battery and the function of constant voltage, constant current charge and discharge. The experiments prove
that the converter can achieve the basic purpose of the charge grid⁃side power factor to be 1 and the discharge grid⁃
side power factor to be⁃1.
Key words: lithium⁃ion battery; rectifier; constant voltage constant current

DC⁃steep pulse field in transformer oil purifying
MI Yan, ZHANG Yan⁃yuan, ZHOU Long⁃xiang, YAO Chen⁃guo, LI Cheng⁃xiang
(State Key Laboratory of Power Transmission Equipment & System Security and New Technology,
Chongqing University, Chongqing 400044, China)
Abstract: Transformer oil is an important internal insulating medium for immersed power transformers and its per⁃
formance has a direct impact to the transformer electrical performance and operating life. Traditional physical and
chemical methods for the purification of contaminated transformer oil have a limited effect and it is difficult to purify
online. Using DC⁃steep pulse field to purify transformer oil online can be a good way to solve some of the deficien⁃
cies of the above methods. In this paper, we chose the power transformer oil which has been operated in 110kV
substation for 17 years as the research object. Based on orthogonal experimental design, the DC⁃steep pulse field
with different parameters has been divided to 9 groups to purify the dirty transformer oil to find out the primary and
secondary order of each factor as well as a set of optimal combination of parameters. Then, according to the optimal
parameters obtained, the single variable method was used to study pulse width and pulse voltage factors. Dielectric
loss was measured to judge the purification effect.
Key words: DC⁃steep pulse field; orthogonal experiment; single variable method; purification effect

Two kinds of low voltage ride⁃through schemes comparison
analysis of double fed wind generator
OUYANG Hui, LI Pei⁃qiang, LI Xin⁃ran, ZHU Lin, HU Long⁃hui
(College of Electrical and Information Engineering, Hunan University, Changsha 410082, China)
Abstract: With the dramatic increase of the proportion of wind power in the power system, the standard for the low
voltage ride through capability of the wind generators combined to the grid is more and more strict. In this paper,
through the mathematical model of DFIG, the reasonable value range of the resistance of Crowbar is analyzed, and
moreover,the low voltage control strategy for cutting off the Crowbar circuit before the clearing of fault is proposed.
Finally the grid⁃model is built up in Matlab/ Simulink, and the impact of the maximum limiting current value of the
grid⁃converter on the DC bus voltage, which counts as one of the main low voltage performance indicators, is dis⁃
cussed. Based on the above discussion, two low⁃voltage schemes are compared: one is the rotor side Crowbar cir⁃
cuit, and the other is with additional DC side unloading circuit, and the simulation results show that by increasing
the Crowbar resistance value, the latter can absorb the excess energy, which makes it more effective than the former
to suppress the transient inrush current in the stator and rotor windings as well as to stabilize the DC bus voltage.
Key words: wind power generation; low voltage ride through; Crowbar circuit; damp circuit; bus voltage

Investigation on short⁃term temporospatial complementarities of
China’s wind energy resources spreading over wide area
LIU Yi1, 2, XIAO Li⁃ye1, 2, WANG Hai⁃feng, DAI Shao⁃tao1, 2, QI Zhi⁃ping
(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. North China Electric Power University, Beijing 102206, China)
Abstract: Wind power is highly variable and difficult to predict due to the intermittent and fluctuating nature of
wind energy resources. Integrating such unstable power source into power systems will bring significant impacts on
the safe and reliable operation of them. Interconnecting geographically dispersed wind generations is one of the fea⁃
sible ways to smooth wind power output. Until now making use of the temporospatial complementarities of geograph⁃
ically dispersed wind resources has attracted more and more eyes at home and abroad over recent years. For China,
hourly smoothing effect of combining geographically dispersed wind energy resources has been well studied, but the
short⁃term effect still needs to be investigated. Hence,based on the data provided by China Meteorological Adminis⁃
tration (CMA), this paper analyzes the short⁃term (1minute) temporospatial complementarities of wind energy re⁃
sources spreading over a wide area in China. Several results are drawn based on the analysis and a feasible diagram
for China to make use of the complementarities of renewable resources is discussed in this paper.
Key words: temporospatial complementarities; wind power; fluctuations; intermittent; smoothing effect; geograph⁃
ical distribution; short term

Study on microgrid economic low⁃carbon scheduling
MAO Xiao⁃ming, LIU Wen⁃sheng, CHEN Shen, WU Jie⁃kang, GUO Zhuang⁃zhi
(1. Guangdong University of Technology, Faculty of Automation, Guangzhou 510006, China;
2. East Inner Mongolia Electric Power Company Limited, Huhhot 010000, China)
Abstract: An economic low⁃carbon scheduling strategy for microgrids is developed in this paper taking both opera⁃
tion costs and carbon emissions into account. The ideal point method is used to deal with the multi⁃objective optimi⁃
zation and the particle swarm algorithm which is fast and robust is used to search the optimum. Taking a 30⁃node
microgrid as the example, giving the typical⁃day load⁃curve and the output predictions of wind turbines and photo⁃
voltaic arrays, system performance under single goal scheduling and multi⁃objective scheduling are compared. The
analysis show that the proposed economic low⁃carbon scheduling makes a tradeoff between economics and emissions
and the comprehensive system performance is more preferred.
Key words: microgrid; economic operation; low⁃carbon scheduling

Review on models of wind speed distribution in wind farms
LI Hui1, 2, SUN Hong⁃bin, ZHANG Fang
(1. School of Automation, Beijing Information Science & Technology University, Beijing 100192, China;
2. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China)
Abstract: The models of wind speed distribution are the important mathematic bases applying to wind resource as⁃
sessment, planning and building of wind farms, and also for the reliability evaluation of power systems. Firstly, this
paper reviews some models of medium⁃and⁃long⁃term wind speed distribution, such as Gamma distribution, Log⁃
normal distribution, Rayleigh distribution, Weibull distribution and Burr distribution. Secondly, on the base of the
Weibull distribution, kinds of parameter estimated methods are introduced. Thirdly, the characteristics of various
distribution models and estimated algorithms are compared respectively. At the end of this paper the prospects of
this research area are put forward.
Key words: wind farm; medium⁃and⁃long term; probabilistic distribution of wind speed; parameter estimation

Research on connection mode of mid⁃voltage distribution network
considering user’s stepwise capacity
XU Jing, LI Juan, XIE Qin, LIU Hong, GUO Yin⁃chang
(1. Tianjin Electric Power Economics & Technology Research Institute, Tianjin 300040, China;
2. Key Laboratory of Smart Grid, Ministry of Education(Tianjin University), Tianjin 300072, China)
Abstract: Considering the influence caused by user’s stepwise capacity in mid⁃voltage distribution network, the
dead zone model of power supply capability, which reflects the shortfall in actual load supply capability compared
by the ideal one, is presented in this paper. Expectation of load and number of users in one feeder is firstly ana⁃
lyzed based on the probability distribution of user’s capacity. According to the results above, this paper also gives
out the formulation of several indices by using dead zone model, such as load ratio of feeder, utilization ratio of in⁃
tervals in substation and average interval occupation per user, which are used to evaluate the efficiency of different
types of connection mode in mid⁃voltage distribution network. The final example shows that, in order to promote the
operational economy, this kind of method can greatly enhance the access capacity of one feeder and resource utiliza⁃
tion in distribution network, meanwhile decreasing the negative impact caused by dead zone.
Key words: mid⁃voltage distribution network; connection modes; dead zone of power supply capability; load ratio;
utilization ratio of intervals; average interval occupation per user

Research on two⁃stage LED power supply with high power factor
WU Jie, WANG Chun⁃fang, LIU Mao⁃sheng
(School of Automation Engineering, Qingdao University, Qingdao 266071, China)
Abstract: In order to solve the disadvantages of the present LED power supply, such as low power factor and large
harmonic current, a novel LED power supply with two⁃stage power factor correction was introduced in this paper.
The first PFC stage of the introduced power supply adopts boost topology to improve the power factor, while the sec⁃
ond DC/ DC stage adopts quasi⁃resonant flyback topology to provide constant⁃current control regulation of the out⁃
put. The PFC stage and the DC/ DC stage are controlled by the same controller, which simplifies the circuit struc⁃
ture, and achieves power⁃factor⁃correction and constant⁃curent driving concurrently. The operating principle of
power factor correction was analysed in detail, meanwhile, the main design parameters were provided. A prototype
of a 12W LED power supply was implemented and tested. The experiment results show that the power factor of the
power supply is higher than 0􀆰 96, and the circuit design and control method are verified to be correct and effective.
Key words: LED power supply; two⁃stage; power factor correction; flyback circuit

New energy management circuit applied in electric
self⁃power supply over high voltage side
LI Yan⁃chuan, JIANG He
(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China)
Abstract: The theory of energy harvested from the high voltage is analyzed, and then the corresponding model of
coupling capacitance derived from static electric field is built, and several experiments are conducted to study
whether the model is valuable. Then, according to what the result reveals, the optimal power point is found out
when energy is managed by rectifier circuit. The value of charged current to super capacitor is used as the judge⁃
ment whether the circuit system has the best storage performance. In that respect, management circuit is improved
as a technology called Synchronous Electric Charge Extract, because the rectifier circuit can’t perform as good as it
is under ultrahigh voltage. It turns out that there is an optimal duty to maximize the energy harvested, so that the
energy harvester can scavenge much more energy to cancel out the power loss. As a result, online monitoring period
could be shortened greatly.
Key words: energy harvesting; synchronous electric charge extract; optimal duty; online monitoring


 
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