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检索条件"机构=Science and Technology on Ship Integrated Power System Technology Laboratory"

共 390 条记录，以下是261-270 订阅

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Position Detection Method of Linear Motor Based on Interactive Multiple Model Cubature Kalman Filter Algorithm

Position Detection Method of Linear Motor Based on Interacti...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Shuai Wang Xiaocun Guan Denghua Guo Shaohua Guan National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728133997

The electromagnetic coil launcher is a special linear motor in which the position detection of the armature plays a crucial role in ensuring the reasonable triggering of each coil and analyzing the performance of the system. At present, there are inevitably some errors in common position detection methods, and the motion model of the armature has the characteristics of nonlinear and strong coupling, in this case, in order to obtain the position and speed of the armature at the same time as the error is as small as possible, an estimation algorithm based on cubature Kalman filter(CKF) and interactive multiple model(IMM) is proposed in this paper. This algorithm adopts three known motion models to replace the complex motion model of the armature, then the observation position of the armature is filtered by CKF. Finally, the IMM-CKF algorithm is verified by the actual measured data during the launch process, and compares with CKF and adaptive iterative CKF with forgetting factor. The results show that the accuracy and stability of IMM-CKF are significantly better than those of the latter two algorithms.

关键词： Filtering algorithms Kalman filters Adaptation models Mathematical model Acceleration power system stability

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Performance Analysis of Broadband Countermeasure Cancellation in Multiple-access Datalink Networks

Performance Analysis of Broadband Countermeasure Cancellatio...

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IEEE Conference on Vehicular technology (VTC)

作者： Qiaran Lu Fangmin He Zhong Yang Yaxing Li Hongbo Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

Multiple-access datalink communication networks (DCNs) are widely used in civil and military communication systems, such as global positioning system and joint tactical information distribution system. With the development of digital signal processing technologies, strong countermeasures, such as block jamming and aiming jamming bring significant challenges to the communication performance of multiple-access DCNs. Meanwhile, cancelling countermeasures whose direction and timing are unknown can be potentially enriched by antenna arrays, thanks to the strong spatial resolution of antenna arrays. This paper analyzes the cancelling performance of strong broadband countermeasures using antenna arrays in multiple-access DCNs. Signal and array models are established taking broadband countermeasures into consideration. Closeform solution expressions of discrete systems are derived, while the analytic expressions of the stability performance and convergence speed of broadband countermeasures cancellation are deduced. Extensive numerical results demonstrate the accuracy of the derivation. The elevational and horizontal dimension pattern of the antenna array are also presented through simulation.

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Open-Circuit Fault Diagnosis for Three-Phase Inverters Using a Step-GA-BP Algorithm

Open-Circuit Fault Diagnosis for Three-Phase Inverters Using...

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International Conference on Sensing, Diagnostics, Prognostics, and Control (SDPC)

作者： Haolan Shen Xin Tang Yaxiang Fan Yachen Wang Yifei Luo Sheng Ai National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728170503

ISBN: (纸本)9781728170510

power converters based on power semiconductor switches (e.g. IGBTs) are widely used in power grids, ships, unmanned vehicles, etc. Open-circuit faults of the switches, which are featured with concealment, must be diagnosed in time to prevent serious losses. In this paper, a step-GA-BP algorithm for the open-circuit fault diagnosis is proposed, and then validated using a typical three-phase two-level inverter. A Simulink model of the inverter is built, by which the output phase voltages are simulated and collected as signal samples to train a neural network diagnosis model. The conventional BP neural network is combined with the genetic algorithm (i.e. the step-GA-BP algorithm) to optimize the training process. The proposed algorithm achieves high diagnosis accuracy and shows advantages over the compared algorithms, in addition, the effects of duration and number of the signal samples are analyzed.

关键词： Training Fault diagnosis Software packages Neural networks Unmanned vehicles Inverters Genetic algorithms

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Physical Model of FS-IGBT Considering Dynamic Avalanche Electrical Characteristics and Analysis of Chip Non-uniform Stress

Physical Model of FS-IGBT Considering Dynamic Avalanche Elec...

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Information technology,Big Data and Artificial Intelligence (ICIBA), International Conference on IEEE International Conference on

作者： Tianzhao Ma Yingjie Jia Yifei Luo Naval University of Engineering National key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781728152240

ISBN: (纸本)9781728152257

Dynamic avalanche is the extreme operating condition of IGBT, and it has unique electrical characteristics in the switching off transient. In order to accurately characterize the turn off characteristics of IGBT, this paper proposes an improved method of traditional IGBT turn off physical model for dynamic avalanche phenomenon based on the physical mechanism of dynamic avalanche phenomenon and the multiplier effect after dynamic avalanche formation. Finally, according to the physical model, the uneven distribution of stress on the chip surface is analyzed, which provides the basis for IGBT model establishment and reliability analysis.

关键词： Insulated gate bipolar transistors Breakdown voltage Transient analysis Analytical models Junctions Semiconductor process modeling power system dynamics

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Random swithing frequency pulse width modulation: Analysis, design and simulation

Random swithing frequency pulse width modulation: Analysis, ...

引用

Chinese Automation Congress (CAC)

作者： Jie Xu Ziling Nie Junjie Zhu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781467371902

The traditional pulse-width modulation has been widely applied to the electronic and electric device in power system. However, the unexpected harmonics produce much electromagnetic noise which causes torque ripple, mechanical resonance and acoustic noise. By analyzing the harmonics theory of the traditional pulse-width modulation (PWM), a random switching frequency pulse-width modulation (RSFPWM) based on uniform distribution is designed in this paper. The simulation of the random switching frequency pulse-width modulation shows that the peaks of harmonics spectrum lines reduced and is more flattened than the traditional pulse-width modulation. And the simulations verified the validity and feasibility of the random switching frequency pulse-width modulation. The random switching frequency pulse-width modulation proposed in this paper elaborates the basic theory that is suitable for both AC and DC power supply.

关键词： Switches Frequency-domain analysis Pulse width modulation Frequency modulation

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Measurement of Equivalent Electrical Conductivity of Carbon Fiber Sleeve

Measurement of Equivalent Electrical Conductivity of Carbon ...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Xiwen Yu Youxing Xiong Yu Wang Junquan Chen Dong Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728152158

ISBN: (纸本)9781728152165

In this paper, a method for measuring electrical conductivity of the carbon fiber sleeve is introduced. Different from traditional method using the bar, the ring shaped specimen is adopted, where eddy current is induced and flows in the closed loop. An air-gapless reactor was designed, based on this, the reactor was given a sinusoidal excitation with a certain frequency and different amplitudes. By separating the joule loss from the measured total loss, the equivalent electrical conductivity along the circumferential direction can be computed according to the theoretical formula. The result is validated by a finite element model established in Ansoft/Maxwell 3D.

关键词： Loss measurement Carbon Conductivity Current measurement Magnetic separation Magnetic cores Eddy currents

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Research on electromagnetic coupled Theory High-speed Multi-stage Cylinder Linear Launcher

Research on electromagnetic coupled Theory High-speed Multi-...

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China International Electrical and Energy Conference (CIEEC)

作者： Guan Xiao-cun Shi Duolin Guan Shao-hua Yuan Lida National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

According to actual structure of High-speed Multi-stage cylinder linear launcher (HSMCLL), based on electromagnetic field theory, the mathematical model of the launcher is deduced, which considers inter-stage coupling effect. The discharge control strategy of the launcher is proposed. The dynamic performance of the launcher is simulated, and the current of drive coil and speed of armature are presented. Experiment results contrast with simulation results, they are coincidence well. It verifies the validity of the model and provides a new way for the study and implementation of control strategy of this kind of machine.

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A manchester code communication protocol suitable for power electronics system

A manchester code communication protocol suitable for power ...

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Annual Conference of Industrial Electronics Society

作者： Qiang Ren Fei Xiao Sheng Ai Xiaoliang Hao National key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

To satisfy the requirements of complex distributed power electronic system (PES) communication, this paper has proposed a single optic-fiber link data communication protocol based on the Manchester code due to an vacancy in the commonly-adopted protocols, analyzed the encoding and decoding principle of Manchester code, defined the formats of command frame and data frame, calculated the communication time and error rate, and described the mechanism of fault identification and handing. All this leads to a distributed master-slave control structure suitable for high-power multiphase inverter and a point-to-point data communication mode. Experiments prove the protocol to be correct and feasible. The Manchester code communication protocol based on FPGA program is simple in the structure of hardware and software. When the system clock is 100MHz, the communication bandwidth can reach 40Mbps, which can meet the needs for communication of PES with kHz or 10kHz switching frequency.

关键词： Data communication Encoding Protocols Clocks Control systems Decoding Receivers

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Position sensorless switching control strategy of SPMSMs based on fault tolerance of position sensor

Position sensorless switching control strategy of SPMSMs bas...

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China International Electrical and Energy Conference (CIEEC)

作者： Zexin Tan Junjie Zhu Zhicheng Wu Jin Xu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

This paper proposes a switching method based on model reference adaptive system (MRAS) from position sensor control strategy to sensorless control strategy for surface permanent magnet synchronous motor (SPMSM) drives operating in medium and high velocity regions. The proposed switching method can effectively deal with the fault of the position sensor in SPMSM system, so as to improve its safety and stability. The sensor setting of control strategy consists of an actual sensor (position sensor) and the virtual sensor (MRAS). When the system position sensor has no fault, the feedback value of the position sensor has a greater weight on the information of the rotor position and velocity of the closed-loop system, while the weight of the MRAS estimated value is lower. When the position sensor fails, the information of the rotor position and velocity of the closed-loop system is provided by MRAS algorithm. Also, a linear weighted switching method is proposed, which can effectively reduce the motor fluctuation during the switching process. The feasibility of the proposed strategy is confirmed via simulations of SPMSM drive model in MATLAB/Simulink software.

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Dynamic Characteristics Simulation of Medium Voltage DC Off-Grid Hydrogen Production system

Dynamic Characteristics Simulation of Medium Voltage DC Off-...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Jie Zhang Fei Xiao Fan Ma Runlong Xiao National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

On the premise of ensuring safety of large power grid, in order to maximize the utilization of wind power and photovoltaic for green hydrogen production, this paper proposes a system solution of off-grid wind-solar complementary hydrogen production. Firstly, the models of wind turbine, photovoltaic, electrolyzer cell and other equipment in the wind-solar complementary hydrogen production system are studied. The electromagnetic transient simulation model of the off-grid wind-solar complementary hydrogen production system is established. Then, energy storage system is controlled by introducing power outer loop to solve the voltage support problem in the main grid of the system. Secondly, in order to make full use of new energy for power generation, combined with the characteristics of hydrogen production equipment that can absorb fluctuating power, a coordinated control strategy of constant current output was proposed it to realizes the cooperative control of the interaction of sources and loads. Finally, aiming at the typical operating conditions of the system, the validity of the mathematical model and its control strategy system is verified by simulation. The method proposed in this paper can effectively improve the utilization rate of renewable energy and provide a complete set of solutions for green energy to participate in hydrogen production.

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