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< Page ,Total 18 >
Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period EI Scopus
期刊论文 | 2018 | IEEE Transactions on Industrial Electronics
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Abstract :

The alternate arm converter (AAC) is a promising candidate for HVDC converter stations due to its reduced number of devices and capability of blocking the DC fault current. This paper is focused on modelling and control of the AAC with an extended overlap period. First a generic mathematical model considering all the switching state combinations of the AAC is developed, which governs the characteristic of the time-varying, three-phase imbalanced circuit parameters of the AAC. Based on the developed model, an AC-side current control strategy with a feed-forward compensation method to overcome the time-varying nature of the circuit parameters is proposed. Then, by introducing the so-called "double-overlap period", a synthetic circulating current strategy is proposed, which enables both DC current active filtering and zero-current switching of the director switches. The validity of the model and effectiveness of the proposed strategies are confirmed by simulation studies on an HVDC system. IEEE

Keyword :

Alternate arm converter Circulating current Current control strategy Feed-forward compensation HVDC converter station HVDC systems Modelling and controls Modular multilevel converters

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GB/T 7714 Liu, Shenquan , Saeedifard, Maryam , Wang, Xifan . Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period [J]. | IEEE Transactions on Industrial Electronics , 2018 .
MLA Liu, Shenquan 等. "Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period" . | IEEE Transactions on Industrial Electronics (2018) .
APA Liu, Shenquan , Saeedifard, Maryam , Wang, Xifan . Zero-current Switching Control of the Alternate Arm HVDC Converter Station with an Extended Overlap Period . | IEEE Transactions on Industrial Electronics , 2018 .
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Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers EI Scopus
期刊论文 | 2018 | IEEE Transactions on Plasma Science
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Abstract :

Prefire is the unexpected breakdown of gas switch at triggered mode and have to be limited at extremely low level in fast linear transformer driver (FLTD). In this paper, the dispersion of breakdown voltage as well as prefire characteristics of high pressure gas spark switches under typical working conditions of FLTD was investigated and reported. Tested switches included a three-electrode field-distortion gas switch (TFGS) and a six-stage multichannel gas switch (SMGS), which had compact structure and low inductance. The results showed that the self-breakdown voltage of both TFGS and SMGS obeyed three parameter well-bull distribution and the dispersion of Ub at &#x00B1; 90 kV could reach 4&#x0025; of TFGS and 14&#x0025; of SMGS, respectively. The dispersion of Ub was remarkably influenced by the floating potential of middle electrode. By grounding the triggering electrode via a kilohm resistor, the dispersion of Ub decreased to 2&#x0025; in TFGS and 6.5&#x0025; in SMGS, respectively. When a voltage equalization method by cascade resistors was introduced, the dispersion of Ub in SMGS dramatically decreased to 4.4&#x0025;. In repetitive operation at triggered mode, the prefire rate of TFGS reached 0.9&#x0025; at &#x0263; = 80&#x0025; working coefficient and decreases with the decrease of &#x0263; , being 0.3&#x0025; at &#x0263; = 72&#x0025; and 0.2&#x0025; at &#x0263; = 65&#x0025;, respectively. The prefire rate of SMGS was much higher, reaching 1.7&#x0025; at &#x0263; = 72&#x0025; and 0.7&#x0025; at &#x0263; = 65&#x0025;, and decreased to 0.6&#x0025; and 0.3&#x0025;, respectively, after applying the equalizing resistors. Generally, the prefire rate of SMGS was somewhat higher than that of TFGS with the same working coefficient and the floating potential limiting was imperative for prefire inhibition. IEEE

Keyword :

Compact structures Fast linear transformer drivers Floating potentials Gas switch High pressure gas prefire Repetitive operations Self-breakdown voltages

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GB/T 7714 Li, Xiaoang , Pei, Zhehao , Ma, Chaoqun et al. Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers [J]. | IEEE Transactions on Plasma Science , 2018 .
MLA Li, Xiaoang et al. "Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers" . | IEEE Transactions on Plasma Science (2018) .
APA Li, Xiaoang , Pei, Zhehao , Ma, Chaoqun , Zhang, Yuzhao , Zhang, Qiaogen . Prefire Properties of High Pressure Gas Spark Switches for Fast Linear Transformer Drivers . | IEEE Transactions on Plasma Science , 2018 .
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Ensemble recurrent neural network based probabilistic wind speed forecasting approach EI Scopus CSSCI-E
期刊论文 | 2018 , 11 (8) | Energies
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Abstract :

Wind energy is a commonly utilized renewable energy source, due to its merits of extensive distribution and rich reserves. However, as wind speed fluctuates violently and uncertainly at all times, wind power integration may affect the security and stability of power system. In this study, we propose an ensemble model for probabilistic wind speed forecasting. It consists of wavelet threshold denoising (WTD), recurrent neural network (RNN) and adaptive neuro fuzzy inference system (ANFIS). Firstly, WTD smooths the wind speed series in order to better capture its variation trend. Secondly, RNNs with different architectures are trained on the denoising datasets, operating as sub-models for point wind speed forecasting. Thirdly, ANFIS is innovatively established as the top layer of the entire ensemble model to compute the final point prediction result, in order to take full advantages of a limited number of deep-learning-based sub-models. Lastly, variances are obtained from sub-models and then prediction intervals of probabilistic forecasting can be calculated, where the variances inventively consist of modeling and forecasting uncertainties. The proposed ensemble model is established and verified on less than one-hour-ahead ultra-short-term wind speed forecasting. We compare it with other soft computing models. The results indicate the feasibility and superiority of the proposed model in both point and probabilistic wind speed forecasting. © 2018 by the authors.

Keyword :

Adaptive neuro fuzzy inference systems (ANFIS) Adaptive neuro-fuzzy inference system Ensemble learning Probabilistic forecasting Recurrent neural network (RNN) Short-term wind speed forecasting Wavelet threshold de-noising Wind speed forecasting

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GB/T 7714 Cheng, Lilin , Zang, Haixiang , Ding, Tao et al. Ensemble recurrent neural network based probabilistic wind speed forecasting approach [J]. | Energies , 2018 , 11 (8) .
MLA Cheng, Lilin et al. "Ensemble recurrent neural network based probabilistic wind speed forecasting approach" . | Energies 11 . 8 (2018) .
APA Cheng, Lilin , Zang, Haixiang , Ding, Tao , Sun, Rong , Wang, Miaomiao , Wei, Zhinong et al. Ensemble recurrent neural network based probabilistic wind speed forecasting approach . | Energies , 2018 , 11 (8) .
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Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks EI Scopus
期刊论文 | 2018 , 54 (6) , 5822-5832 | IEEE Transactions on Industry Applications
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Abstract :

This paper proposed a varying magnetic network modeling method of dual-rotor permanent magnet reluctance (DRPMR) machines based on magnetic circuits considering possible saturation and nonlinearity according to the physical structure, which is put forward to obtain the accurate inductance characteristics of the proposed machine. The feasibility of this analytical model is confirmed by the finite element method. Moreover, experiments are designed to validate the analytical results. It indicates that the analytical inductance characteristics of the DRPMR machine have good agreements with the experimental results. © 1972-2012 IEEE.

Keyword :

Analytical results Dual rotors Finite element analysis method Inductance calculation Magnetic network models Magnetic networks Physical structures Stator winding

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GB/T 7714 Du, Jinhua , Xue, Yuntian , Liu, Quanwei et al. Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks [J]. | IEEE Transactions on Industry Applications , 2018 , 54 (6) : 5822-5832 .
MLA Du, Jinhua et al. "Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks" . | IEEE Transactions on Industry Applications 54 . 6 (2018) : 5822-5832 .
APA Du, Jinhua , Xue, Yuntian , Liu, Quanwei , Wang, Shuhong . Improved Analytical Model for Inductance Calculations of a Dual-Rotor Permanent Magnet Reluctance Machine Based on Magnetic Networks . | IEEE Transactions on Industry Applications , 2018 , 54 (6) , 5822-5832 .
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Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT EI
期刊论文 | 2018 , 33 (6) , 6894-6903 | IEEE Transactions on Power Systems
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Abstract :

As Type-3 wind turbine (WT) has already become a typical type of highly penetrated power sources in modern power systems, characterizing its properties during grid fault is a basic requirement for system analysis. However, many significant factors have not been considered in the existing analytical methods and results, such as various switching of internal control and protection circuits in low voltage ride through (LVRT) solutions. In this paper, performance of Type-3 WT during LVRT is first illustrated and summarized as the sequential switching characteristic in multi time scales, viz., instant control, ac control, dc voltage control, and rotor speed control time scales. Thus, for magnitude drops in stator voltage, a mathematical model is proposed to understand this characteristic and fault current analysis's features. Then, an analytical method, based on the operational inductance, is proposed so that fault current components, with the sequential switching considered, can be depicted with a unified and simple analytical expression. By identifying magnitude of symmetrical current, the transient and steady-state equivalent circuits of Type-3 WT are proposed to estimate momentary current and electrical power approximately. Finally, analytical results are verified by comparisons with real-time simulation results of a detailed 1.5 MW WT model in RT-LAB. © 1969-2012 IEEE.

Keyword :

Analytical expressions Circuit faults Doubly Fed Induction generators (DFIG) Fault current components Low voltage ride through (LVRT) Multi-time scale Real time simulations Switching characteristics

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GB/T 7714 Chang, Yuanzhu , Hu, Jiabing , Tang, Wangqianyun et al. Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT [J]. | IEEE Transactions on Power Systems , 2018 , 33 (6) : 6894-6903 .
MLA Chang, Yuanzhu et al. "Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT" . | IEEE Transactions on Power Systems 33 . 6 (2018) : 6894-6903 .
APA Chang, Yuanzhu , Hu, Jiabing , Tang, Wangqianyun , Song, Guobing . Fault current analysis of Type-3 WTs considering sequential switching of internal control and protection circuits in multi time scales during LVRT . | IEEE Transactions on Power Systems , 2018 , 33 (6) , 6894-6903 .
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A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption EI Scopus
期刊论文 | 2018 | IEEE Transactions on Power Delivery
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Abstract :

Controlled switching technology operates circuit breakers at the minimum arcing time for short-circuit current interruption. However, there is no report to reveal a relationship between the short-circuit current interrupting capability with the minimum arcing time and the opening velocities of vacuum interrupters. The objective of this paper is to reveal a relationship between the short-circuit current interrupting capability with the minimum arcing time and the opening velocities of vacuum interrupters. A 40.5 kV fast vacuum circuit breaker prototype was built up which was equipped with a commercial 40.5 kV-31.5 kA vacuum interrupter and it was driven by an electromagnetic repulsion mechanism. It provided an average velocities ranging from 2.5 to 5.5 m/s. 50 times of 40 kA short-circuit current interrupting tests were carried out in a synthetic circuit. Test results showed that the minimum arcing time of successful interruption decreased with the increasing of the average opening velocity. The minimum arcing gap was determined as 1.8 mm and it kept as a constant as the average opening velocity increased. The experiment results also showed a relationship between the arc energy density and the arc extinguishing gap, which acted a linear boundary between the successful and failure short-current interruptions. IEEE

Keyword :

Interrupters minimum arcing interrupting capability Power system reliability Vacuum arcs Vacuum interrupters

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GB/T 7714 Zhang, Bojian , Ren, Li , Ding, Jian'gang et al. A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption [J]. | IEEE Transactions on Power Delivery , 2018 .
MLA Zhang, Bojian et al. "A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption" . | IEEE Transactions on Power Delivery (2018) .
APA Zhang, Bojian , Ren, Li , Ding, Jian'gang , Wang, Jianhua , Liu, Zhiyuan , Geng, Yingsan et al. A Relationship between Minimum Arcing Interrupting Capability and Opening Velocity of Vacuum Interrupters in Short-circuit Current Interruption . | IEEE Transactions on Power Delivery , 2018 .
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Experimental Study of the Breakdown Characteristics of Polypropylene Films Under Nanosecond Voltage Pulses EI Scopus
期刊论文 | 2018 | IEEE Transactions on Plasma Science
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Abstract :

Due to its low-loss and high dielectric strength, polypropylene is widely used as electrical insulation material in pulse capacitors. In order to study its breakdown characteristics for nanosecond voltage pulses, an experimental setup was designed to generate voltage pulses with a 10&#x0025;-90&#x0025; rise time of 38 ns and a full width at half maximum of about 90 ns. Tests of the three polypropylene films with thicknesses of 12, 15, and 18 &#x03BC;m were performed. In addition, hundreds of nanoseconds pulse and dc voltage were also applied for comparison. The experimental results reveal that most of the breakdown occurs during the front edge of the pulse for tens of nanoseconds pulse, and the breakdown strengths of the three kinds of polypropylene films are almost identical for different applied voltages, which show a weak correlation between the thickness of the dielectric and the breakdown field. The expected breakdown strength of tens of nanoseconds pulse defined in this paper is not significantly higher than the mean value of the hundreds of nanoseconds pulse and the dc condition, suggesting that the breakdown of a thin polypropylene film is mainly determined by the electrical field but not the voltage-time cumulative effect. All these observations strengthen the conclusion that the breakdown of a thin polypropylene film is an intrinsic phenomenon. IEEE

Keyword :

Breakdown characteristics Breakdown strengths Cumulative effects Electrical field High dielectrics Nanosecond pulse Poly-propylene film Volume effect

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GB/T 7714 Chen, Zhiqiang , Ji, Shengchang , Jia, Wei et al. Experimental Study of the Breakdown Characteristics of Polypropylene Films Under Nanosecond Voltage Pulses [J]. | IEEE Transactions on Plasma Science , 2018 .
MLA Chen, Zhiqiang et al. "Experimental Study of the Breakdown Characteristics of Polypropylene Films Under Nanosecond Voltage Pulses" . | IEEE Transactions on Plasma Science (2018) .
APA Chen, Zhiqiang , Ji, Shengchang , Jia, Wei , Tang, Junping , Guo, Fan , Li, Junna et al. Experimental Study of the Breakdown Characteristics of Polypropylene Films Under Nanosecond Voltage Pulses . | IEEE Transactions on Plasma Science , 2018 .
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Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum EI Scopus CSCD PKU
期刊论文 | 2018 , 44 (6) , 2019-2026 | Gaodianya Jishu/High Voltage Engineering
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Abstract :

Multiple re-ignition overvoltage is determined by dielectric recovery strength after interruption of small inductive currents in vacuum. We established a micro-physical model for small inductive current interruption in vacuum, with which the influence of load parameters on the re-ignitions can be determined, so as to reveal the sheath development process after interruption of small inductive current in vacuum. The following micro-parameters were determined, including the ion density, ion speed, development of electric field, and potential distribution under various TRVs. A critical electric field strength at the cathode was chosen as a criterion for the re-ignition. The simulation results show the following influence of load parameters on the re-ignitions of small current inductive current interruption in vacuum. A higher load capacitance or a higher load inductance will decrease the sheath development speed and the maximum field strength, which decreases the overvoltage and the risk of re-ignition. The sheath speed and the maximum field strength does not change with the increase of the equivalent resistance, but the load current decreases with the increase of the equivalent resistance. A lower load current reduces sheath velocity, which results in a lower maximum electric field strength. Therefore, it decreases the risk of re-ignition. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Dielectric recovery Inductive current Over-voltages Sheath Vacuum circuit breaker

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GB/T 7714 Wang, Feng , Wang, Zhongyi , Hao, Mengmeng et al. Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum [J]. | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (6) : 2019-2026 .
MLA Wang, Feng et al. "Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum" . | Gaodianya Jishu/High Voltage Engineering 44 . 6 (2018) : 2019-2026 .
APA Wang, Feng , Wang, Zhongyi , Hao, Mengmeng , Liu, Zhiyuan . Dielectric Recovery Process of Multiple Re-ignition Phenomena After Small Inductive Current Interruption in Vacuum . | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (6) , 2019-2026 .
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Bi-level two-stage stochastic SCUC for ISO day-ahead scheduling considering uncertain wind power and demand response EI CSSCI-E
会议论文 | 2017 , 2017 (13) , 2549-2554 | 6th International Conference on Renewable Power Generation
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Abstract :

This study considers ISO day-ahead (DA) scheduling under uncertain conditions with demand response (DR). Two kinds of DR, incentive-based DR (IDR) and price-based DR (PDR) are both incorporated according to their response characteristics. A bi-level two-stage stochastic security-constrained unit commitment (SCUC) model is proposed for this programme to minimise the ISO cost considering uncertain wind power output and uncertain price elasticity. The upper level is a two-stage stochastic programme. The first stage determines unit commitment and contract capacity of IDR programme while the second stage determines economic dispatch, wind power utilisation and actual dispatch power of IDR programme in the real-time (RT). A chance-constraint is used to ensure wind power utilisation. In the lower level, a priority method is used to select successful bidders based on the calculated contract capacity from the upper level. Results on the revised IEEE 118-bus system show that, the ISO would avoid frequent rescheduling and economic loss with uncertain PDR incorporated into the model. Besides, with IDR flexibly mitigating uncertainty and volatility from wind power and PDR, the ISO would have lower cost and avoid frequent rescheduling of thermal units. Also, this model could ensure wind power utilisation, thus promoting wind power integration. © 2017 Institution of Engineering and Technology. All rights reserved.

Keyword :

Chance constraint Day-ahead scheduling Economic Dispatch IEEE 118-bus system Response characteristic Stochastic security constrained unit commitments Uncertain condition Wind power integrations

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GB/T 7714 Gong, Naiwei , Luo, Xianjue , Chen, Danyang . Bi-level two-stage stochastic SCUC for ISO day-ahead scheduling considering uncertain wind power and demand response [C] . 2017 : 2549-2554 .
MLA Gong, Naiwei et al. "Bi-level two-stage stochastic SCUC for ISO day-ahead scheduling considering uncertain wind power and demand response" . (2017) : 2549-2554 .
APA Gong, Naiwei , Luo, Xianjue , Chen, Danyang . Bi-level two-stage stochastic SCUC for ISO day-ahead scheduling considering uncertain wind power and demand response . (2017) : 2549-2554 .
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Transmission planning considering spatial correlation of wind power EI Scopus
会议论文 | 2017 , 0 | 13th IEEE PES International Conference on Transmission and Distribution Construction, Operation and Live-Line Maintenance, ESMO 2016
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Abstract :

Due to similar meteorological conditions, neighboring wind farm outputs are correlated, which usually results in amplified uncertainty. However, wind power is assumed to be independent in traditional transmission planning, causing potential risks in wind integration and power system security. This paper initially proposes a transmission planning approach considering correlation of wind power. The spatial dependence of neighboring wind farm outputs is modeled by Copula theory. Then, a transmission planning method is established based on multi-scenario model of correlated wind power and is further solved by generic algorithm. Validity of the proposed method is tested on Garver 6-bus system. Numerical results show that transmission extension plan is affected by wind correlation. The transmission line between wind connection sites is avoided to prevent amplified negative effects of dependent wind power. Compared with traditional planning, the proposed method shows similar economic performance in total cost, with increasing transmission investment and reducing operation cost. © 2016 IEEE.

Keyword :

Economic performance Meteorological condition Power system security Probabilistic methods Spatial correlations Traditional planning Transmission investments Transmission Planning

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GB/T 7714 Zhang, Yue , Wang, Xiuli , Wu, Xiong et al. Transmission planning considering spatial correlation of wind power [C] . 2017 .
MLA Zhang, Yue et al. "Transmission planning considering spatial correlation of wind power" . (2017) .
APA Zhang, Yue , Wang, Xiuli , Wu, Xiong , Zeng, Pingliang , Shi, Haobo . Transmission planning considering spatial correlation of wind power . (2017) .
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