|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions显示文摘This paper presents a unified positive-and negative-sequence dual-dq dynamic model of wind-turbine driven doubly-fed induction generator(DFIG) under unbalanced grid voltage conditions. Strategies for enhanced control and operation of a DFIG-used back-to-back(BTB) PWM voltage source converter(VSC) are proposed. The modified control design for the grid-side converter in the stationary αβ frames diminishes the amplitude of DC-link voltage ripples of twice the grid frequency,and the two proposed control targets for the rotor-side converter are alternatively achieved,which,as a result,improve the fault-ride through(FRT) capability of the DFIG based wind power generation systems during unbalanced network supply. A complete unbalanced control scheme with both grid-and rotor-side converters included is designed. Finally,simulation was carried out on a 1.5 MW wind-turbine driven DFIG system and the validity of the developed unified model and the feasibility of the proposed control strategies are all confirmed by the simulated results. | HU Jia-bing HE Yi-kang NIAN Heng | 2007 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2007，8，8： | 20 |
| 2 | Dependence of creep age formability on initial temper of an Al-Zn-Mg-Cu alloy显示文摘The initial temper of the material may directly affect the whole creep age forming(CAF)process. In terms of creep deformation and stress relaxation, using the constant-stress creep aging and constant-strain stress relaxation aging tests, the relationship between initial temper and CAF formability is investigated for an Al-Zn-Mg-Cu alloy at 165 °C for 18 h. Three tempers are selected as the initial tempers in CAF, viz., solution, retrogression and re-solution. The CAF formability of this alloy with initial temper of retrogression is the best, and the creep strain of the retrogression tempered specimen after creep aging of 18 h is about 1.21 and 1.34 times than that of the solution and the re-solution tempered specimens, respectively. The calculated stress exponents of this alloy with three initial tempers range from 7.3 to 9.5, indicating that the CAF of this alloy is mainly controlled by the dislocation creep. The various formability for three initial tempers are attributed to different inhibitions of the transgranular precipitates on the dislocation movement. For the retrogression temper, the initial fine and uniformly distributed precipitates are seriously coarsened after6 h of CAF, which minimally inhibit the dislocation movement. While, for the re-solution temper,the fine precipitates are re-precipitated in the matrix of the alloy, which observably hinder the dislocation movement and lead to the worst formability. | Lei Chao Yang He Li Heng Shi Nian Fu Jin Zhan Lihua | 2016 | Chinese Journal of Aeronautics2016，29，5： | 5 |
| 3 | Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI显示文摘When grid side converter(GSC)is connected to weak grid,the small signal instability can happen due to terminal characteristics of the GSC that are incompatible with the grid impedance.This issue is not of wide concern in previous studies of direct power control(DPC)of GSC.By small signal analysis,it is shown that the impedance characteristic of the conventional direct power control GSC is not compatible with the inductive grid impedance in weak grid due to its constant power load behavior.To solve the problem,instead of feeding the DPC controller with direct measured voltage and current,a Kalman filter(KF)is used to obtain filtered output current and a double second-order generalized integrator(DSOGI)is used to obtain filtered voltage at the point of common coupling(PCC).These strategies change the impedance characteristic of the GSC dramatically and make it suitable to operate in weak grid where SCR is 2,while the rapid power response is preserved.The proposed strategy is verified through simulation and controller hardware in loop(CHIL)tests. | Liang Chen Heng Nian Yunyang Xu | 2019 | Chinese Journal of Electrical Engineering2019，5，4： | 4 |
| 4 | Comparison of resonant current regulators for DFIG during grid voltage distortion显示文摘We investigate two different kinds of resonant current regulators for a doubly fed induction generator(DFIG) under distorted grid voltage conditions: proportional integral resonant(PIR) regulator with traditional resonant part and vector proportional integral(VPI) regulator with VPI resonant part. Based on the mathematical model of DFIG under distorted grid voltage, the transfer function and frequency response characteristics of the two current regulators are analyzed and compared. The superiority of the VPI current regulator over the PIR regulator is pointed out, and the influence of discretization methods on the performance of the resonant current regulator is studied. All the results are validated by MATLAB simulation and experiments. | Yi-peng SONG Heng NIAN | 2013 | Journal of Zhejiang University-Science C(Computers and Electronics)2013，14，12： | 2 |
| 5 | Multiple target implementation for a doubly fed induction generator based on direct power control under unbalanced and distorted grid voltage显示文摘This paper presents a multiple target implementation technique for a doubly fed induction generator(DFIG) under unbalanced and distorted grid voltage based on direct power control(DPC).Based on the mathematical model of DFIG under unbalanced and distorted voltage,the proportional and integral(PI) regulator is adopted to regulate the DFIG average active and reactive powers,while the vector PI(VPI) resonant regulator is used to achieve three alternative control targets:(1) balanced and sinusoidal stator current;(2) smooth instantaneous stator active and reactive powers;(3) smooth electromagnetic torque and instantaneous stator reactive power.The major advantage of the proposed control strategy over the conventional method is that neither negative and harmonic sequence decomposition of grid voltage nor complicated control reference calculation is required.The insensitivity of the proposed control strategy to DFIG parameter deviation is analyzed.Finally,the DFIG experimental system is developed to validate the availability of the proposed DPC strategy under unbalanced and distorted grid voltage. | Heng NIAN Yi-peng SONG | 2015 | Frontiers of Information Technology & Electronic Engineering2015，16，4： | 2 |
| 6 | Using Inverter-Based Renewable Generators to Improve the Grid Power Quality-A Review显示文摘With the increasing penetration of renewable power in the grid,renewable generators are expected to play more important roles rather than merely working as active power sources.Considering the high controllability and considerable idle capacity of the inverter-based renewable generators,various auxiliary functions for them have been studied to benefit the grid.Among these auxiliary functions,the grid power quality improvement is very promising.This paper presents a review of the emerging control strategies for inverter-based renewable generators to improve grid power quality.The related papers are classified with different power quality issues and technical routes,and a comprehensive comparison is presented.The future trends of this research area are also discussed. | Tao Wang Heng Nian Z.Q.Zhu | 2018 | Chinese Journal of Electrical Engineering2018，4，4： | 2 |
| 7 | Resonance Active Damping and PCC Voltage Quality Improvement of DFIG System Connected to Parallel Compensated Grid显示文摘Under the connection to a weak grid,the Doubly Fed Induction Generator(DFIG)based wind power system has potential risk from two operational issues.The first issue is the High Frequency Resonance(HFR)mode due to the impedance interaction between the DFIG system and the weak grid.In order to ensure safe and reliable operation of the DFIG system,it is necessary to implement effective active damping strategies to mitigate the HFR.The second issue is low order voltage harmonic distortion at the Point of Common Coupling(PCC),where consequently the performance of other grid-connected devices may deteriorate.It could be advantageous that the DFIG system is able to improve the voltage quality at PCC by eliminating the low order harmonic components.In this paper,both of the above mentioned DFIG operational characters,i.e.,active damping of HFR and the improvement of voltage quality at PCC,will be achieved by implementing advanced control strategies in the Rotor Side Converter(RSC)and the Grid Side Converter(GSC)respectively.Simulations are provided to verify the proposed control strategies for DFIG system connected to a weak grid. | Yipeng Song Nian Heng Frede Blaabjerg | 2018 | Chinese Journal of Electrical Engineering2018，4，4： | 2 |
| 8 | Dynamic modeling and improved control of dfig under distorted grid voltage conditions显示文摘 | Hu Jiabing Nian Heng Xu Hailiang | 2011 | IEEE Transactions on Energy Conversion2011，26，1： | 1 |
| 9 | Direct active and reactive power regulation of DFIG using sliding-mode control approach显示文摘 | HU Jiabing NIAN Heng HU Bin | 2010 | IEEE Trans on Energy Conversion2010，25，4： | 1 |
| 10 | Direct activeand reactive power regulation of DFIG using sliding-modecontrol approach 显示文摘 | Hu Jiabing Nian Heng Hu Bin | 2010 | IEEE Transactions on EnergyConversion2010，25，4： | 1 |
| 11 | Sensorless operation of PM type bearingless motor显示文摘 | Nian Heng He Yi-Kang Qin Feng Liu Yi | 2004 | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering2004，24，11： | 1 |
| 12 | Improved direct power control of a wind turbine driven doubly fed induction generator during transient grid voltage unbalance显示文摘 | NIAN Heng SONG Yipeng ZHOU Peng | 2011 | IEEE Transactions on Energy Conversion2011，26，3： | 1 |
| 13 | Control of back-to- back pwm converters for DFIG wind turbine systems under unbalanced grid voltage 显示文摘 | Hu Jiabing He Yikang Nian Heng | 2007 | Journal of Zhejiang University2007，8，8： | 1 |
| 14 | Improved Control Strategy of an Active Crowbar for Directly-driven PM Wind Generation System under Grid Voltage Dips显示文摘 | Nian Heng Liu Jiao Zhou Peng He Yikang | | 0，，01： | 1 |
| 15 | Direct active and reactive power regulation of DFIG using sliding-mode control approach显示文摘 | HuJiabing Nian Heng Hu Bin | 2010 | IEEE Transaction on Energy Conversion2010，25，4： | 1 |
| 16 | Dynamic modeling and improved control of DFIG under distorted grid voltage conditions显示文摘 | Hu Jiabing Nian Heng Xu Hailiang | 2011 | IEEE Transactions Energy Convers2011，26，1： | 1 |
| 17 | Improved three-vector based dead-beat model predictive direct power control strategy for grid-connected inverters显示文摘Since only one inverter voltage vector is applied during each duty cycle, traditional model predictive direct power control(MPDPC) for grid-connected inverters(GCIs) results in serious harmonics in current and power. Moreover, a high sampling frequency is needed to ensure satisfactory steady-state performance, which is contradictory to its long execution time due to the iterative prediction calculations. To solve these problems, a novel dead-beat MPDPC strategy is proposed, using two active inverter voltage vectors and one zero inverter voltage vector during each duty cycle. Adoption of three inverter vectors ensures a constant switching frequency. Thus, smooth steady-state performance of both current and power can be obtained. Unlike the traditional three-vector based MPDPC strategy, the proposed three vectors are selected based on the power errors rather than the sector where the grid voltage vector is located, which ensures that the duration times of the selected vectors are positive all the time. Iterative calculations of the cost function in traditional predictive control are also removed, which makes the proposed strategy easy to implement on digital signal processors(DSPs) for industrial applications. Results of experiments based on a 1 kW inverter setup validate the feasibility of the proposed three-vector based dead-beat MPDPC strategy. | Chen-wen CHENG Heng NIAN Long-qi LI | 2018 | Frontiers of Information Technology & Electronic Engineering2018，19，11： | 0 |
| 18 | Message from Editors显示文摘ELECTRICAL machine systems have found extensive applications,for which various machine topologies have been proposed in the recent years.Performance analysis and optimal design with theoretical methods and multi-field finite element methods are key issues for developing high-end products.Meanwhile,control strategies linked with specific machine topologies and design considerations are rather beneficial for the electrical machine systems,in the aspects of energy efficiency,output smoothness,control precision,dynamic response,and many others. | Jian-Xin Shen Dianguo Xu Xiaoyan HUANG Qinfen LU Heng NIAN Pierre-Daniel PFISTER Huan YANG Taiying ZHENG | 2017 | CES Transactions on Electrical Machines and Systems2017，1，2： | 0 |
| 19 | Quantitative Comparison of Partitioned-Stator Machines for Hybrid Electric Vehicles显示文摘In this paper,three partitioned-stator(PS)machines,namely the PS flux-switching DC-field(PS-FSDC)machine,the PS-FS hybrid-excitation(PS-FSHE)machine,and the flux adjuster FS permanent-magnet(FA-FSPM)machine are proposed.With different flux-regulating mechanisms,all three proposed machines can offer satisfactory flux-weakening capabilities for wide-speed range operations.Unlike the traditional PS machine that installs the armature windings and the excitation sources in the outer-stator and inner-stator,respectively;the proposed machines purposely swap the installation arrangements.Upon the proposed structure,the FA-FSPM machine can fully utilize the stator core for PM material accommodations.As a result,excellent power and torque densities can be achieved.To verify the proposed concepts,these three PS machines are quantitatively compared based on the hybrid electric vehicle(HEV)specifications. | Christopher.H.T.Lee James L.Kirtley M.Angle Heng Nian | 2017 | CES Transactions on Electrical Machines and Systems2017，1，2： | 0 |
| 20 | High Frequency Resonance in DFIG-Based Wind Farm with Variable Power Capacity显示文摘As wind power penetration has been gaining in the power grid for decades,a large number of the doubly fed induction generator(DFIG)based wind farms are being established around the globe.The power capacities of these wind farms may vary around hundreds of MW,and most of the wind farms are connected to long transmission cables whose impedances can not be ignored and require careful attention.Several works have investigated the impedance interaction between the DFIG based wind farm and long transmission cables which may unfortunately cause high frequency resonance(HFR).The main contribution of this paper is to investigate the influence of the variable wind farm capacity on the behavior of the HFR when certain transmission cables are provided.It is found out that the potential HFR may happen in certain wind farms,and the larger wind farm capacity causes more severe HFR due to the relatively weaker grid transmission capability.Simulation results based on Matlab/Simulink are given to validate the analysis of HFR. | Yipeng Song Heng Nian Frede Blaabjerg | 2017 | Chinese Journal of Electrical Engineering2017，3，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员