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Development and advances in modular multilevel converter based HVDC projects in China

Frontiers of Engineering Management   Pages 183-189 doi: 10.1007/s42524-022-0248-7

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Keywords： high voltage direct current     power converter     power systems     renewable energy     ultra-high voltage    

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Experimental study of pollution effect on the behavior of high voltage insulators under alternative current

Hani BENGUESMIA, Nassima M’ZIOU, Ahmed BOUBAKEUR

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 213-221 doi: 10.1007/s11708-017-0479-1

Abstract: this paper, the impact of the conductivity and the distribution of pollution on the behavior of the highvoltage insulator cap and pin 1512L, artificially polluted is described.different conductivities for a discontinuous distribution of the pollution on the insulator under an AC voltageFurthermore, the influence of the pollution on the flashover voltage and the leakage current is studied

Keywords： 1512L insulator     circular model     artificial pollution     flashover     leakage current     discontinuous pollution     high voltage    

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Impact of selection of DC base values and DC link control strategies on sequential AC-DC power-flow convergence

Shagufta KHAN,Suman BHOWMICK

Frontiers in Energy 2015, Volume 9, Issue 4,   Pages 399-412 doi: 10.1007/s11708-015-0374-6

Abstract: This paper demonstrates the convergence of the integrated AC-DC power-flow algorithm as affected by the selection of different base values for the DC quantities and adoption of different control strategies for the DC link. For power-flow modeling of integrated AC-DC systems, the base values of the various DC quantities can be defined in several ways, giving rise to different sets of per-unit system equations. It is observed that different per-unit system models affect the convergence of the power-flow algorithm differently. In a similar manner, the control strategy adopted for the DC link also affects the power-flow convergence. The sequential method is used to solve the DC variables in the Newton Raphson (NR) power flow model, where AC and DC systems are solved separately and are coupled by injecting an equivalent amount of real and reactive power at the terminal AC buses. Now, for a majority of the possible control strategies, the equivalent real and reactive power injections at the concerned buses can be computed a-priori and are independent of the NR iterative loop. However, for a few of the control strategies, the equivalent reactive power injections cannot be computed a-priori and need to be computed in every NR iteration. This affects the performance of the iterative process. Two different per-unit system models and six typical control strategies are taken into consideration. This is validated by numerous case studies conducted on the IEEE 118-bus and 300-bus test systems.

Keywords： AC-DC power-flow     Newton-Raphson method     high voltage direct current (HVDC) control strategy    

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Research of an Interleaved Low-Voltage/High-Current DC-DC Converter

Wang Ping,Sun Xu,Song Liangyu

Strategic Study of CAE 2005, Volume 7, Issue 4,   Pages 59-63

Abstract:

In the recent years, the operating voltages of most high-performance microprocessors were lower thanthat of the previous ones and the research of low-voltage/high-current DC-DC converter was enhanced.Among all topologies, the current-doublers topology is optional.In the current-doublers topology, the ripple current of the output filter capacitor is reduced becausethat a few of current-doublers are interleaved.

Keywords： low-voltage/high-current DC-DC converter     current-doublers     interleaved    

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Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

Tong Zhang, Elie Paillard

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 577-591 doi: 10.1007/s11705-018-1758-z

Abstract: component of electrolytes, due to its excellent ability to allow graphite anode operation–also required for highIn the last years, many alternative electrolytes, aiming at allowing high voltage battery operation,Thus, we review here the high voltage, EC-free alternative electrolytes, focusing on those allowing the

Keywords： lithium-ion     electrolyte     solid electrolyte interphase     additives     high voltage     graphite    

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Parameter identification of interconnected power system frequency after trip-out of high voltage transmission

Xuzhan ZHOU,Shanshan LIU,Mingkun WANG,Yiping DAI,Yaohua TANG

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 386-393 doi: 10.1007/s11708-014-0323-9

Abstract: Accurate modeling and parameters of high voltage (HV) grid are critical for stability research of system

Keywords： high voltage (HV) grid     frequency stability parameter identification     primary frequency regulation (PFR    

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Influence of direct electric current on wetting behavior during brazing

Kirsten BOBZIN, Wolfgang WIETHEGER, Julian HEBING, Lidong ZHAO, Alexander SCHMIDT, Riza ISKANDAR, Joachim MAYER

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 3,   Pages 496-503 doi: 10.1007/s11465-019-0582-6

Abstract: Therefore, the effect of direct electric current along the surface of a steel substrate on the wettingBy applying direct current up to = 60 A the wetted surface area could be increased and the spreadingof the molten filler metal could be controlled in dependence of the polarity of the electric currentTo evaluate the influence of the electric current on the phase formation subsequent selective electron

Keywords： brazing     electric current assisted wetting     Lorentz force    

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Multiple target implementation for a doubly fed induction generator based on direct power control underunbalanced and distorted grid voltage

Heng NIAN,Yi-peng SONG

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 4,   Pages 321-334 doi: 10.1631/FITEE.1400170

Abstract: implementation technique for a doubly fed induction generator (DFIG) under unbalanced and distorted grid voltagebased on direct power control (DPC).Based on the mathematical model of DFIG under unbalanced and distorted voltage, the proportional andregulator is used to achieve three alternative control targets: (1) balanced and sinusoidal stator currentdeveloped to validate the availability of the proposed DPC strategy under unbalanced and distorted grid voltage

Keywords： Direct power control     Doubly fed induction generator     Unbalanced and distorted grid voltage     Vector proportional    

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Influence of the intensity and loading time of direct current electric field on the directional migration

Xiaoyu Wang,Yuxuan Gao,Haigang Shi,Na Liu,Wei Zhang,Hongbo Li

Frontiers of Medicine 2016, Volume 10, Issue 3,   Pages 286-296 doi: 10.1007/s11684-016-0456-9

Abstract: aimed to determine the following: (1) the direction of rat BMSC (rBMSC) migration upon exposure to a directcurrent electric field (DCEF), (2) the optimal DCEF intensity and duration, and (3) the possible regulatory

Keywords： DCEF     migration     osteogenesis differentiation     rBMSCs     SDF-1/CXCR-4    

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Design and analysis of a new high frequency double-servo direct drive rotary valve

Muzhi ZHU,Shengdun ZHAO,Jingxiang LI

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 344-350 doi: 10.1007/s11465-016-0406-x

Abstract:

Researchers have investigated direct drive valve for many years to solve problems, such as fluid forceThis paper studied the high frequency double-servo direct drive rotary valve (DDRV), and proposed a novelstructure and drive method satisfying high reversing frequency and adequate quantity of flow.Aside from the fast reversing function of the valve, the DDRV presented high performance in linearity

Keywords： direct drive rotary valve     computational fluid dynamics (CFD)     flow regulation    

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Reasonable Rated Voltage of High and Medium Power Adjustable-Speed Drives for Energy Saving

Ma Xiaoliang

Strategic Study of CAE 2001, Volume 3, Issue 11,   Pages 80-84

Abstract:

A large amount of energy will be saved if adjustable-speed drives are adopted by high and medium powerThe rated voltage of most of the motors in the power range is 10 kV because the power supply is 10 kVbecause this kind of inverter consists of a lot of power electronic devices in series and its cost is highand reliability is poorer than lower voltage one.of the motor and inverter is the same as power supply, i. e. a lower rated voltage can be used for the

Keywords： high and medium power     adjustable-speed drives for energy saving     reasonable rated voltage     low voltageinverters     medium voltage inverters     by-pass    

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power quality conditioner based on a three-level NPC inverter using fuzzy control techniques for all voltage

Salim CHENNAI,M-T BENCHOUIA

Frontiers in Energy 2014, Volume 8, Issue 2,   Pages 221-239 doi: 10.1007/s11708-014-0317-7

Abstract: The proposed UPQC is capable of mitigating source current harmonics and compensate all voltage disturbancessuch as voltage sags, swells, unbalances and harmonics.The DC voltage is maintained constant using proportional integral voltage controller.performances of the proposed UPQC system are evaluated in terms of power factor correction, mitigation of voltageor current harmonics and all other voltage disturbances compensation using Matlab-Simulink software

Keywords： three-level neutral point clamped (NPC) inverter     unified power quality conditioner (UPQC)     current harmonicsmitigation     fuzzy logic controller     voltage disturbance compensation     shunt active filter     series active    

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Metal-based direct hydrogen generation as unconventional high density energy

Shuo XU, Jing LIU

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 27-53 doi: 10.1007/s11708-018-0603-x

Abstract: Metals are unconventional hydrogen production materials which are of high energy densities.This paper comprehensively reviewed and digested the latest researches of the metal-based direct hydrogenenergy capacities of various metals were summarized, and the application potentials of the metal-based direct

Keywords： metal     hydrogen generation     hydrolysis     metal water reaction     clean energy    

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Series transformer based diode-bridge-type solid state fault current limiter

Amir HEIDARY,Hamid RADMANESH,Seyed Hamid FATHI,G. B. GHAREHPETIAN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 9,   Pages 769-784 doi: 10.1631/FITEE.1400428

Abstract: IGBT, across the series damping resistor ( ) and capacitor, which inserts high impedance into the lineto limit the fault current.Then, by controlling the magnitude of the DC reactor current, the fault current is reduced and the voltageconnected in parallel with the IGBT, serves as a snubber circuit for decreasing the transient recovery voltageThe proposed SSFCL can limit the fault current without any delay and successfully smooth the fault current

Keywords： Solid state fault current limiter (SSFCL)     Power quality     Voltage sag     Point of common coupling (PCC)    

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Development of a simplified n-heptane/methane model for high-pressure direct-injection natural

Jingrui LI, Haifeng LIU, Xinlei LIU, Ying YE, Hu WANG, Xinyan WANG, Hua ZHAO, Mingfa YAO

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 405-420 doi: 10.1007/s11708-021-0718-3

Abstract: High-pressure direct-injection (HPDI) of natu-ral gas is one of the most promising solutions for futureIn short, the reduced chemical kinetic models developed provide a high-efficient and dependable method

Keywords： high-pressure direct-injection     natural gas     chemical kinetics     combustion modelling     marine engine    

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Title Author Date Type Operation

Development and advances in modular multilevel converter based HVDC projects in China

Journal Article

Experimental study of pollution effect on the behavior of high voltage insulators under alternative current

Hani BENGUESMIA, Nassima M’ZIOU, Ahmed BOUBAKEUR

Journal Article

Impact of selection of DC base values and DC link control strategies on sequential AC-DC power-flow convergence

Shagufta KHAN,Suman BHOWMICK

Journal Article

Research of an Interleaved Low-Voltage/High-Current DC-DC Converter

Wang Ping,Sun Xu,Song Liangyu

Journal Article

Recent advances toward high voltage, EC-free electrolytes for graphite-based Li-ion battery

Tong Zhang, Elie Paillard

Journal Article

Parameter identification of interconnected power system frequency after trip-out of high voltage transmission

Xuzhan ZHOU,Shanshan LIU,Mingkun WANG,Yiping DAI,Yaohua TANG

Journal Article

Influence of direct electric current on wetting behavior during brazing

Kirsten BOBZIN, Wolfgang WIETHEGER, Julian HEBING, Lidong ZHAO, Alexander SCHMIDT, Riza ISKANDAR, Joachim MAYER

Journal Article

Multiple target implementation for a doubly fed induction generator based on direct power control underunbalanced and distorted grid voltage

Heng NIAN,Yi-peng SONG

Journal Article

Influence of the intensity and loading time of direct current electric field on the directional migration

Xiaoyu Wang,Yuxuan Gao,Haigang Shi,Na Liu,Wei Zhang,Hongbo Li

Journal Article

Design and analysis of a new high frequency double-servo direct drive rotary valve

Muzhi ZHU,Shengdun ZHAO,Jingxiang LI

Journal Article

Reasonable Rated Voltage of High and Medium Power Adjustable-Speed Drives for Energy Saving

Ma Xiaoliang

Journal Article

power quality conditioner based on a three-level NPC inverter using fuzzy control techniques for all voltage

Salim CHENNAI,M-T BENCHOUIA

Journal Article

Metal-based direct hydrogen generation as unconventional high density energy

Shuo XU, Jing LIU

Journal Article

Series transformer based diode-bridge-type solid state fault current limiter

Amir HEIDARY,Hamid RADMANESH,Seyed Hamid FATHI,G. B. GHAREHPETIAN

Journal Article

Development of a simplified n-heptane/methane model for high-pressure direct-injection natural

Jingrui LI, Haifeng LIU, Xinlei LIU, Ying YE, Hu WANG, Xinyan WANG, Hua ZHAO, Mingfa YAO

Journal Article