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

共 387 条记录，以下是271-280 订阅

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Application of Chaotic Pulse Width Modulation in Suppressing Characteristic Frequency Vibration of Magnetic Bearing

Application of Chaotic Pulse Width Modulation in Suppressing...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Jianshan Wang Junquan Chen Jinghua Hu Zhenzhong Su Chao Wu Dong Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728133997

In order to suppress the high frequency vibration at the characteristic frequencies of the magnetic bearing (MB) caused by the switching power amplifier, an improved chaotic pulse width modulation (ICPWM) technique is proposed to reduce the high frequency vibration. In the PWM signal generator, the chaotic frequency carrier is applied to replace the original fixed frequency carrier, the spectral offset coefficient is introduced into the carrier frequency, and the parameters such as the initial value of the chaotic sequence are optimized with the differential evolution (DE) algorithm. The simulation and experimental results verify that the modulation technique can effectively suppress the vibration at the characteristic frequencies of the MB without adding the external filters, and provides a feasible technical means for realizing the warship's acoustic stealthiness.

关键词： Harmonic analysis Magnetic levitation power amplifiers Pulse width modulation Frequency modulation Resonant frequency Vibrations

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Research Status of the High-power Microwave Sources Based on Gyromagnetic Nonlinear Transmission Lines

Research Status of the High-power Microwave Sources Based on...

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Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Yancheng Cui Jin Meng Yuzhang Yuan Danni Zhu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

In the past decades, the wideband high-power microwave sources which combine the advantages of high-power density of narrow-band sources and wide spectrum of ultra-wideband sources have drawn much attention. As a kind of wideband high-power microwave source, gyromagnetic nonlinear transmission lines have the characteristics of high center frequency, easily implementation of frequency adjustment, high pulse repetition frequency, etc. Based on the history and research status of the gyromagnetic nonlinear transmission lines for the applications in high power microwaves generation, key technologies and developing trends were summarized. This research may help related scholars get information systematically about the gyromagnetic nonlinear transmission lines.

关键词： Microwave photonics Microwave oscillators Magnetomechanical effects Ferrites Microwave communication Perpendicular magnetic anisotropy

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Research on Rectangular Array Retrodirective Cross-Eye Jamming Method Considering Target Echo

Research on Rectangular Array Retrodirective Cross-Eye Jammi...

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International Conference on Communication technology (ICCT)

作者： Wei Liu Jin Meng Liang Zhou National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

The cross-eye jamming is one of the most effective methods for monopulse radar. In this paper, the rectangular array retrodirective cross-eye jamming method is proposed to solve the problems of strict tolerance traditional retrodirective cross-eye jamming method. Considering the echo of the target platform, the mathematical model of the rectangular array retrodirective cross-eye jamming is deduced by using the extended analysis method, and the general expressions of the jamming-to-signal ratio (JSR) and indication angle are obtained. Finally, it is compared with the traditional retrodirective cross-eye jamming method. The conclusion is that the rectangular array retrodirective cross-eye is better than the traditional retrodirective cross-eye jamming method.

关键词： Jamming Interference Radar Radar antennas Modulation Aerospace electronics Mathematical model

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Analytical Modeling and Thermal Effect Analysis of Electromagnetic Rail Launcher

Analytical Modeling and Thermal Effect Analysis of Electroma...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Feifei Yan Junyong Lu Junwei Cui Yongsheng Zhang Biao Wu Wei Guo National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781728133997

The large thermal energy in launching because of high-current and high-speed affect the engineering application of electromagnetic rail launcher. In this paper, considering the inductance gradient and the resistance gradient, the circuit model of Electromagnetic Rail Launcher including PFN, rail, armature and cable is established, the motion model of armature position, speed and current are taken for interative analytical calculation by using Matlab. The data contrast with other literature and experimental shows that the model is correct and effective. The heating effect analysis of Electromagnetic Rail Launcher include Joule energy of rail resistance, cable and induction, friction energy between armature and rail, etc. Comparison with the kinetic energy of projectile, the thermal energy of rail including resistance and friction and Joule energy of cable take a large proportion in system energy. The paper provides a basis for the cooling design of Electromagnetic Rail Launcher.

关键词： Rails Electromagnetics Resistance Inductance Resistance heating Mathematical model Capacitors

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Multi-Virtual Inertia Coordinated Control technology for AC/DC Hybrid Micro-Grid

Multi-Virtual Inertia Coordinated Control Technology for AC/...

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Lin Yunfeng Fu Lijun Xia Li Gao Xueping National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

New energy power generation equipment and loads can be connected to AC / DC hybrid microgrid flexibly. In order to achieve system frequency and voltage stability, and make full use of the inertia of energy storage, wind turbines, etc. to enhance the anti-disturbance capability of the system. With the flexibility of power control in the AC/DC hybrid micro-grid, both sides of the AC and DC can achieve mutual support of power. In this paper, a virtual inertial joint control technique is proposed in combination with VSG control and virtual capacitor control. Simulation experiments show that the proposed method can effectively improve AC side damping and reduce voltage, frequency and power oscillation recovery time under given system parameters.

关键词： Inverters Damping Batteries Capacitors Voltage control Mathematical model power system stability

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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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Correlator Circuit Calibration Based on Phase Offset for Analog Self-Interference Cancellation system of LFMCW Radar

Correlator Circuit Calibration Based on Phase Offset for Ana...

引用

International Conference on Communication technology (ICCT)

作者： Qing Wang Yunshuo Zhang Huanding Qin Fangmin He Jin Meng National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan Hubei China

Self-interference stemming from transmission power leakage to the receiver deteriorates the performance of linear frequency modulated continuous wave (LFMCW) radar. Therefore, how to increase the isolation between the transmitting and receiving antennas becomes a major problem for the improvement of LFMCW radar. In this paper, we adopt a microwave adaptive interference cancellation system based on down-conversion, and propose to use a phase shifter to offset the phase shift caused by the circuit delay and components in the down-conversion circuit, thereby improving the self-interference cancellation ratio. Experiments are conducted to evaluate our methods. The results show that, compared with the traditional delay-based compensation method, our phase-offset based method can increase the interference cancellation ratio (ICR) by 15dB under the condition of wired interference coupling and 10dB under the wireless coupling condition.

关键词： Radio frequency Interference cancellation integrated circuits Couplings Conferences Radar

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An Improved Strategy for Modular Multilevel Converter at Low Speed Operation 5

An Improved Strategy for Modular Multilevel Converter at Low...

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2018 5th International Conference on Advanced Composite Materials and Manufacturing Engineering, ACMME 2018

作者： Zeng, Qifan Xiao, Fei Ai, Sheng Ren, Qiang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

One of the main problems of the Modular Multilevel Converter (MMC) for ship electric propulsion applications is the significant magnitude of capacitor voltage ripple at low speed operation. The commonly used solution is harmonic injection. In this paper, the injection rules are explored through the dynamic relationship of MMC in a comprehensive way, and the harmonic characteristics of injection current are derived. Furthermore, the circulating current controller is modified according to the harmonics of injected current with changing frequency, which reduces the ripple of capacitor voltage effectively in a wide speed range. Simulation results are shown to demonstrate the effectiveness of the proposed method. © Published under licence by IOP Publishing Ltd.

关键词： ships

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Optimizing design of multi-coil solenoid HTS magnet by PSO algorithm

Optimizing design of multi-coil solenoid HTS magnet by PSO a...

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2018 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2018

作者： Huang, Wen Chen, Jun Quan National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781538624944

The superconducting magnet has been used more and more widely due to the advances in refrigeration technology and superconducting material. Consequently, its design requirements become higher. This paper combines particle swarm optimization (PSO) and numerical calculation using finite-element (FE) for the rapidly-optimized design of multi-coil solenoid high-temperature-superconducting (HTS) magnet which must satisfy the need of electromagnetism. On this basis, the length of the material used will be minimized. With the optimum design of a magnetic fluid propeller as an example, the second-generation HTS material is selected for developing a superconducting magnet prototype, which is not lower than 6T in central magnetic field strength, not less than 340∗100mm2 in its uniform region and not less than 100mm in diameter. © 2018 IEEE.

关键词： Superconducting magnets

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The Strategy of Inverter Seamless Mode Switching in Master-Slave Independent Micro-grid

The Strategy of Inverter Seamless Mode Switching in Master-S...

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2018 International Conference on Electrical Engineering, Control and Robotics, EECR 2018

作者： Jiang, Hanhong Lu, Yao Wu, You Wang, Yi National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

In order to realize the uninterruptible power supply in the master-slave independent micro-grid system, the micro-grid inverter needs to realize the mode switching of the grid-connection/grid-disconnection. How to reduce the transient oscillation during switching, so as to effectively achieve seamless mode switching is a key issue to be solved. In this paper, a typical master-slave control independent micro-grid is used as an example, the strategy of mode switching is improved in two aspects. On the one hand, the state-following algorithm is adopted to improve the switching strategy of the outer loop. On the other hand, the current inner loop is taken by the H∞ robust controller to improve the robustness of the controller. Compared with the traditional PI control mode switching, this paper illustrates the feasibility of the proposed strategy through the simulation and experiment verification. The improvement strategy in this paper can effectively reduce the voltage and current oscillation during mode switching. © The Authors, published by EDP sciences, 2018.

关键词： Controllers

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