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IEEE Student Conference on Electric Machines and systems

作者： Kabindra Pokharel Sonee Sapkota Weilin Li Donghua Wu Ming Yan Yi Wang School of Automation Northwestern Polytechnical University Xi’an China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd. Xi’an China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

For on/off-grid DC microgrid, this paper proposes an improved droop control strategy combined with DC bus signaling to split transient and average load power between supercapacitor (SC), battery, and grid. SC converter with virtual impedance droop is responsible for supplying transient load power, whereas battery converter and grid rectifier, both with virtual resistor droop, are responsible for additional average load power in off-grid and on-grid modes, respectively. DC bus signaling is implemented for the smooth transition of DC microgrid from off-grid to on-grid state. The working methods for the proposed control strategy and the design of the system are explained, and theoretical analyses are verified by simulations.

关键词： Rectifiers Microgrids Supercapacitors Dynamic scheduling Batteries Resource management Transient analysis

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Dynamic Transient Power Sharing in Grid-Connected DC Microgrid

Dynamic Transient Power Sharing in Grid-Connected DC Microgr...

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Sustainable Power and Energy Conference (iSPEC)

作者： Kabindra Pokharel Sonee Sapkota Yufeng Wang Zhen Kang Ming Huang Weilin Li Donghua Wu Ming Yan Kai Fan Yi Wang School of Automation Northwestern Polytechnical University Xi'an China Aviation Key Laboratory of Science and Technology on Aerospace Power System Shaanxi Aero Electric Co. Ltd. Xi'an China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

This paper proposes an extended droop control strategy for dynamic transient power-sharing between supercapacitor (SC) and AC grid to manage the power demand in the DC microgrid. The proposed control strategy utilizes a virtual impedance droop structure with the SC converter and a virtual resistor droop structure with the grid rectifier, which are responsible for splitting the load power into transient and average load power, respectively. Load transient caused by a sudden change in the load is buffered by supercapacitor and additional average load power demand is supplied by the grid. The working methods of the proposed control strategy and the design of the system are explained, and theoretical analyses are verified by simulations.

关键词： Power demand Rectifiers Microgrids Supercapacitors Dynamic scheduling Resource management Transient analysis

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Dynamic temperature prediction of electronic equipment under high altitude long endurance conditions

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Chinese Journal of aeronautics 2018年第6期31卷 1189-1197页

作者： Liping PANG Miao ZHAO Kun LUO Yongli YIN Zhou YUE School of Aeronautic Science and Engineering Beihang University Beijing 100083 China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training Center Beijing 100094 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration. Nanjing 211102 China

Unmanned Aerial Vehicle（UAV） is developing towards the direction of High Altitude Long Endurance（HALE）. This will have an important influence on the stability of its airborne electronic equipment using passive thermal management. In this paper, a multi-node transient thermal model for airborne electronic equipment is set up based on the thermal network method to predict their dynamic temperature responses under high altitude and long flight time conditions. Some relevant factors are considered into this temperature prediction model including flight environment,radiation, convection, heat conduction, etc. An experimental chamber simulating a high altitude flight environment was set up to survey the dynamic thermal responses of airborne electronic equipment in a UAV. According to the experimental measurement results, the multi-node transient thermal model is verified without consideration of the effects of flight speed. Then, a modified way about outside flight speed is added into the model to improve the temperature prediction performance. Finally, the corresponding simulation code is developed based on the proposed model. It can realize the dynamic temperature prediction of airborne electronic equipment under HALE conditions.

关键词： Airborne electronic equipment High altitude long endurance Multi-node transient thermal model Node thermal network Temperature prediction

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Optimization on the transmission distance and efficiency of magnetic resonant WPT system

Optimization on the transmission distance and efficiency of ...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Chen, Wen-Xian Chen, Zhu-Ping Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

This paper is mainly focused on the analysis of the transmission characteristics of the resonant WPT system to optimize the system parameters by improving the energy transfer efficiency and extending the transmission distance. Focns on improving the energy transfer efficiency and extending the transmission distance from the coil quality factor, coil structure, load selection and high frequency. © 2018 IET Conference Publications. All rights reserved.

关键词： Magnetic resonance

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Carrier based PWM with harmonics injection for multiphase induction motor drive

Carrier based PWM with harmonics injection for multiphase in...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Liu, Dong Mi, Chang-Bao Zhang, Kun Yu, Long-Ji Nanjing Engineering Institute of Aircraft System Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

The interest in multi-phase (number of phase higher than three) machines for high performance applications has been g rowing in recen t years du e to th ei r potential advantages over three-phase machines. To solve the problems of complex arithmetic in the multiphase Space Vector Pulse Width Modulation (SVPWM) control and low utilization ratio of dc bus voltage and low torque density in the multiphase Sinusoidal Pulse Width Modulation (SPWM) control, a multiphase carrier based PWM control method based on harmonics injection was analyzed. The proposed method improved the output voltage characteristic through injecting several harmonics signals to the standard sine fundamental signal. This paper, firstly, calculated the MMF distribution of a set of multiphase windings. Then, based on it, the magnetic field distribution of multiphase induction motor was discussed, and three kinds of multiphase carrier PWM technologies are compared. Theoretical analysis and experiment results show that the proposed multiphase carrier PWM method based on harmonics injection can enhance the dc bus voltage utilization ratio effectively, improve motor torque density and efficiency, while has the characteristics of low torque ripple and simple realization. © 2018 IET Conference Publications. All rights reserved.

关键词： Pulse width modulation

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Nonlinear Generalized Predictive Control of Permanent Magnet Synchronous Motor Based on Extended State Observer

Nonlinear Generalized Predictive Control of Permanent Magnet...

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Annual Conference of Industrial Electronics Society

作者： Yilun Liu Yongqing Wang Xiaokai Zhang Guangzhao Luo Siqi Li Yiyan Wang College of Automation Northwestern Polytechnical University Xi An China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

In order to improve robustness of permanent magnet synchronous motor (PMSM) servo system, a nonlinear generalized predictive control (NGPC) strategy based on extended state observer (ESO) is proposed. According to the NGPC theory, a NGPC controller is designed by using the continuous-time model of PMSM. In the case of the parameter variations and external load disturbance in the actual motor system, an ESO based on inverse hyperbolic sine function is introduced to estimate the total disturbance of the system and compensate dynamically in real time. The simulation results show that the proposed control strategy has good dynamic performance and strong robustness, providing an effective approach for engineering implementation.

关键词： Permanent magnet motors Servomotors Predictive control Predictive models Synchronous motors Robustness Load modeling

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Online parameter estimation of cold plate based on extended Kalman filter

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Energy Procedia 2019年 158卷 1850-1855页

作者： Hongsheng Jiang Sujun Dong Aicheng Li Fanxin Meng School of Aeronautic Science and Engineering Beihang University Beijing 100191 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing 211106 China

The cold plate is a single-fluid heat exchanger, often used as the base of onboard electronic devices to cool it down through forced convection of fluid inside. It is not easy to monitor the status of the cold plate and device, due to the limitation of measurement and computing resource on the aircraft. This paper studies the dynamic characteristic of the cold plate by analyzing its typical structure, and a reduced model is derived and then transformed to state-space representation. Next, the extended Kalman filter is applied for online estimation of heat load and mass flow rate. Finally, different sample rates and measurements of detailed simulation data is fed to the algorithm for validation. Results show that monitoring temperature on the surface of device is enough to provide an accurate estimation of head load. Besides, it is suitable to set the sample time between 0.5s and 1.0s.

关键词： cold plate parameter estimation extended Kalman filter heat transfer online algorithm

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Analysis and correction of oil leakage of a hydraulic actuator

Analysis and correction of oil leakage of a hydraulic actuat...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Liu, Bin Zhou, Qinghe Li, Bang Hu, Jiakun Nanjing Engineering Institute of Aircraft Systems Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

A batch of hydraulic actuators had an oil leakage failure. This paper introduces the sealing structure of oil seepage position and analyzes the reason of failure. After investigation, Tests and comparison of the production process of the backup ring with Russian standard of the similar backup ring, we found that the size of the backup ring of the product I unstable. This paper proposes the improved measure. The test and product use demonstrate that the improved measure is effective, and the trouble of failure is eliminated completely. © 2018 IET Conference Publications. All rights reserved.

关键词： Hydraulic actuators

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Design and analysis of a high-speed centrifugal refrigerant compressor

Design and analysis of a high-speed centrifugal refrigerant ...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Fan, Gang Wang, Fei Guo, Jun Liu, Chengyan Deng, Weishi Zhao, Yunfeng Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems Nanjing China

ISBN: (纸本)9781785617911

Compressor is the key equipment of the on-board evaporation cycle system. A complete aerodynamic design method of refrigeration centrifugal compressor is developed in this paper. The method is divided into two parts, which are used to design and analyze separately. Based on the method, a two-stage centrifugal compressor with airfoil diffuser is designed and its performance is predicted. The design rotation rate and pressure ratio are 70000rpm and 4.3 separately. 3D CFD simulation results show that the compressor can meet requirements of the design point of aircraft evaporative refrigeration cycle system. © 2018 IET Conference Publications. All rights reserved.

关键词： Centrifugal compressors

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Research of key technologies for the more electrical aircraft electric cabin supply air system

Research of key technologies for the more electrical aircraf...

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CSAA/IET International Conference on Aircraft utility systems, AUS 2018

作者： Fanxin, Meng Zanjun, Gao Wenyuan, Zheng Wenchao, Hu Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft Systems NEIAS Nanjing China

ISBN: (纸本)9781785617911

The features of economy and environmental protection about civil aircraft are introduced. The development direction of airborne electromechanical system is pointed out on more electrical aircraft. The technological advantages and development status of electrical environmental control system are analyzed. The key technologies of electrical cabin supply air system are described, including high pressure ratio compression, centrifugal compressor anti-surge, variable diffuser design, air bearing supporting, large power motor control, high speed rotor cooling, foreign object damage protection, air inlet anti-icing. It is very helpful to provide technical support for environmental control system development for new generation green civil aircraft. © 2018 IET Conference Publications. All rights reserved.

关键词： Flight control systems

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