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Frontiers in Energy 2023年第1期17卷 149-164页

作者： Shi JIN Long SHI Sul ADEMI Yue zhang fengge zhang School of Electrical Engineering Shenyang University of TechnologyShenyang 110870China Warwick Manufacturing Group University of WarwickCoventry CV47ALWarwickUK School of Electrical Engineering Shandong UniversityJinan 250061China

To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms,the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding ***,the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding ***,a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this *** on the direct power control(DPC)strategy,the post-fault voltage vector selection method is explained in detail according to the fault types of the dual *** fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator(BDFRG)system to operate normally in one,two,or three switches fault of the converter,simultaneously achieving power tracking *** presented results verify the feasibility and validity of the scheme proposed.

关键词： open-winding brushless doubly-fed reluctance generator(BDFRG) direct power control faulttolerant control multi-level converter wind power

Scalar induced gravitational waves in light of Pulsar Timing Array data

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 20-28页

作者： Zhu Yi Qing Gao Yungui Gong Yue Wang fengge zhang Advanced Institute of Natural Sciences Beijing Normal UniversityZhuhai 519087China School of Physical Science and Technology Southwest UniversityChongqing 400715China School of Physics Huazhong University of Science and TechnologyWuhan 430074China Department of Physics School of Physical Science and TechnologyNingbo UniversityNingbo 315211China School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519088China

The power-law parametrization for the energy density spectrum of gravitational wave(GW)background is a useful tool to study its physics and *** scalar induced secondary gravitational waves(SIGWs)from some particular models fit the signal detected by NANOGrav,Parkers Pulsar Timing Array,European Pulsar Timing Array,and Chinese Pulsar Timing Array collaborations better than GWs from supermassive black hole binaries(SMBHBs),we test the consistency of the data with the infrared part of SIGWs which is somewhat independent of *** Bayesian analysis,we show that the infrared parts of SIGWs fit the data better than GW background from *** results give tentative evidence for SIGWs.

关键词： SIGWs PTA data infrared region

Equivalent circuit and characteristic simulation of a brushless electrically excited synchronous wind power generator

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Frontiers of Mechanical Engineering 2017年第3期12卷 420-426页

作者： Hao WANG fengge zhang Tao GUAN Siyang YU School of Electrical Engineering Shenyang University of TechnologyShenyang 110870 China

A brushless electrically excited synchronous generator （BEESG） with a hybrid rotor is a novel electrically excited synchronous generator. The BEESG proposed in this paper is composed of a conventional stator with two different sets of windings with different pole numbers, and a hybrid rotor with powerful coupling capacity. The pole number of the rotor is different from those of the stator windings. Thus, an analysis method different from that applied to conventional generators should be applied to the BEESG. In view of this problem, the equivalent circuit and electromagnetic torque expression of the BEESG are derived on the basis of electromagnetic relation of the proposed generator. The generator is simulated and tested experimentally using the established equivalent circuit model. The experimental and simulation data are then analyzed and compared. Results show the validity of the equivalent circuit model.

关键词： wind power brushless electrically excited synchronous generator hybrid rotor equivalent circuit

Design and Analysis of Asymmetric Rotor Pole Type Bearingless Switched Reluctance Motor

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CES Transactions on Electrical Machines and Systems 2022年第1期6卷 3-10页

作者： Zhenyao Xu Qingguo Yu fengge zhang CES IEEE Shenyang University of Technology TechnologyShenyang110870China

Bearingless switched reluctance motor(BSRM) not only combines the merits of bearingless motor(BM) and switched reluctance motor(SRM), but also decreases the vibration and acoustic noise of SRM, so it could be a strong candidate for high-speed driving fields. Under the circumstances, a 12/14 BSRM with hybrid stator pole has been proposed due to its high output torque density and excellent decoupling characteristics between torque and suspension force. However, this motor has torque dead-zone, which leads to problems of self-start at some rotor positions and large torque ripple during normal operation. To solve the existing problems in the 12/14 type, an asymmetric rotor pole type BSRM is proposed. The structure and design process of the proposed motor is presented in detail. The characteristics of the proposed motor is analyzed and compared with that of the 12/14 type. Furthermore, prototype of the proposed structure is designed, manufactured and experimented. Finally, simulation and test results are illustrated and analyzed to prove the validity of the proposed structure.

关键词： Asymmetric rotor pole bearingless switched reluctance motor self-start torque ripple reduction

Study on Calculation Model of High Speed Machine Silicon Steel Sheet Electromagnetic Characteristics Considering Magnetic, Stress and Temperature Condition

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CES Transactions on Electrical Machines and Systems 2022年第3期6卷 288-297页

作者： Yu Li Guangwei Liu Wenping Cao fengge zhang the School of Electrical Engineering Shenyang University of TechnologyShenyang and 110870China IEEE the School of Engineering and Applied Science Aston UniversityBirmingham and B47ETUK

High-speed motor has the characteristics of high frequency, high temperature, and more stress, resulting in the field distribution inside the motor being complicated. To better study the electromagnetic characteristics of silicon steel sheet for high-speed motor. In this article, a study on the calculation model of silicon sheet electromagnetic characteristics considers the effects of electromagnetic, stress, and temperature factors. The study is divided into two parts, one is to propose the calculation model of silicon steel sheet’s permeability;the other is to improve the calculation model of silicon steel sheet’s loss. Then, the magnetic field, stress field, and temperature field of a surface mount high speed permanent magnet motor(SMHSPMSM) are analyzed by finite element method(FEM), and the results under the consideration of magnetic, stress, and temperature factors are brought into the calculation model for calculation. Finally, the accuracy of the calculation model for electromagnetic characteristics of silicon steel sheet is verified by comparing the calculated results with the finite element results.

关键词： Calculation model Silicon steel sheet Electromagnetic characteristics Magnetic Stress Temperature

Overview of Research and Development Status of Brushless Doubly-Fed Machine System

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Chinese Journal of Electrical Engineering 2016年第2期2卷 1-13页

作者： fengge zhang Siyang Yu Hao Wang Yutao Wang Dapeng Wang Shenyang University of Technology Shenyang110870China

The brushless doubly-fed machine(BDFM)has been widely used due to its advantages of robustness,reliable operation,ease of maintenance,adjustable power factor,small converter capacity and low *** is attractive for use in many applications such as variable frequency speed regulation systems and variable speed constant frequency generation ***,there is a rapidly growing interest in design and control of *** this paper,the origin and development of BDFM are reviewed,the structural characteristics of BDFM are discussed at length,the principles of operation and design are analyzed,and the different control methods used for BDFM are overviewed and compared in ***,challenges and opportunities of BDFM are concluded.

关键词： Brushless doubly-fed machine structure characteristics rotor type operation principle design feature control method

Bacillus amyloliquefaciens Strain W19 can Promote Growth and Yield and Suppress Fusarium Wilt in Banana Under Greenhouse and Field Conditions

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Pedosphere 2016年第5期26卷 733-744页

作者： WANG Beibei SHEN Zongzhuan zhang fengge Waseem RAZA YUAN Jun HUANG Rong RUAN Yunze LI Rong SHEN Qirong National Engineering Research Center for Organic-Based Fertilizers Jiangsu Key Lab and Engineering Center for Solid Organics Waste Utilization Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing Agricultural University Hainan Key Laboratory for Sustainable Utilization of Tropical Bio-Resources College of Agriculture Hainan University Key Laboratory of Plant Nutrition and Fertilization in Low-Middle Reaches of the Yangtze River Ministry of Agriculture Nanjing Agricultural University

Plant growth-promoting rhizobacteria （PGPR） are considered to be the most promising agents for cash crop production via increasing crop yields and decreasing disease occurrence. The Bacillus amyloliquefaciens strain W19 can produce secondary metabolites （iturin and bacillomycin D） effectively against Fusarium oxysporum f. sp. cubense （FOC）. In this study, the ability of a bio-organic fertilizer （BIO） containing strain W19 to promote plant growth and suppress the Fusarium wilt of banana was evaluated in both pot and field experiments. The results showed that application of BIO significantly promoted the growth and fruit yield of banana while suppressing the banana Fusariurn wilt disease. To further determine the beneficial mechanisms of the strain, the colonization of green fluorescent protein-tagged strain W19 on banana roots was observed using confocal laser scanning microscopy and scanning electron microscopy. The effect of banana root exudates on the formation of biofilm of strain W19 indicated that the banana root exudates may enhance colonization. In addition, the strain W19 was able to produce indole-3-acetic acid （IAA）, a plant growth-promoting hormone. The results of these experiments revealed that the application of strain W19-enriched BIO improved the banana root colonization of strain W19 and growth of banana and suppressed the Fusarium wilt. The PGPR strain W19 can be a useful biocontrol agent for the production of banana under field conditions.

关键词： biocontrol bio-organic fertilizer colonization crop yield fungal disease indole-3-acetic acid plant growth-promoting rhizobacteria (PGPR) root exudates

Sintering Caβ″/β/α-Al_2O_3 High Temperature Oxygen Sensor

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Journal of Materials Science & Technology 1995年第5期11卷 345-348页

作者： Yanruo HONG Liansheng LI and fengge zhang(National Laboratory on Solid Electrolytes and Metallurgical Measurements, University of Science and Technology Beijing, Beijing, 100083, China)(To whom correspondence should be addressed) Beijing Univ of Science and Technology Beijing China

An extended-life and ultra-low oxygen sensor has been fabricated by using polycrystalline Caβ″/β/α-Al2O3 as a solid electrolyte. Five reference electrodes CaO+O2, Caβ″/β/α-Al2O3 (powder)+O2,Cr+Cr2O3, Nb+NbO and Mo+MoO2 were tested in order to select a better reference electrode for this sensor. The limit of determining oxygen activity and the extended-life of the sensor were also tested in this study.

关键词： Al2O3 High Temperature Oxygen Sensor Sintering Ca Cr

Comprehensive Analysis of Suspending Force for Improved Bearingless Switched Reluctance Motor with Permanent Magnets in Stator Yoke

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CES Transactions on Electrical Machines and Systems 2018年第4期2卷 348-354页

作者： Fangxu Li Huijun Wang fengge zhang He zhang Instrumentation Science and Opto-electronics Engineering Beihang University School of Instrumentation Science and Opto-electronics Engineering Beihang University School of Electrical Engineering Shenyang University of Technology Best Motion Machine Drive Technology Centre Power ElectronicsMachinesControl Research Groupthe University of Nottingham

Different from conventional switched reluctance motor(SRM),bearingless SRM not only provides torque but also supplies levitation force for free-friction of *** order to make sure that bearingless SRM can steadily levitates in static and dynamic rotating operation,it is necessary to analyze suspending ***,suspending force performance of an improved bearingless SRM with permanent magnets in stator yoke is comprehensively investigated in this *** structure and operation principle with permanent magnets in stator yoke are introduced ***,mathematical model is built up for design of suspending *** addition,parametric analysis for levitation performance is ***,validity of proposed method is verified by experimental results.

关键词： Analysis bearingless switched reluctance suspending force

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变速恒频无刷双馈风力发电机的直接转矩控制

太阳能学报 2012年第3期33卷 419-424页

作者：张凤阁金石沈阳工业大学电气工程学院沈阳110870

针对变速恒频无刷双馈风力发电系统,分析无刷双馈发电机的最大吸收功率与转速之间的关系,提出采用直接转矩控制方法,通过控制发电机转矩和功率因数来调节其有功功率,进而实现最大风能捕获,提高发电效率。此外,还针对无刷双馈发电机内部... 详细信息

针对变速恒频无刷双馈风力发电系统,分析无刷双馈发电机的最大吸收功率与转速之间的关系,提出采用直接转矩控制方法,通过控制发电机转矩和功率因数来调节其有功功率,进而实现最大风能捕获,提高发电效率。此外,还针对无刷双馈发电机内部磁场关系复杂的特点,提出一种新型的速度观测方法,以两相静止坐标系作为参考坐标系,通过估算转子磁链同步旋转速度和转差速度来估测发电机转速,进而实现无速度传感器控制,以提高系统可靠性。由仿真结果可以看出,通过快速调节发电机转矩可以有效获得最大吸收功率,所设计的速度观测器也能快速准确地估算出发电机转速。

关键词：无刷双馈发电机直接转矩控制速度观测功率控制最大风能捕获变速恒频