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Classification using wavelet packet decomposition and support vector machine for digital modulations

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Journal of Systems Engineering and Electronics 2008年第5期19卷 914-918页

作者： Zhao Fucai hu yihua Hao Shiqi Hefei Inst. of Electronic Engineering Hefei 230037 P. R. China

To make the modulation classification system more suitable for signals in a wide range of signal to noise rate （SNR）, a feature extraction method based on signal wavelet packet transform modulus maxima matrix （WPTMMM） and a novel support vector machine fuzzy network （SVMFN） classifier is presented. The WPTMMM feature extraction method has less computational complexity, more stability, and has the preferable advantage of robust with the time parallel moving and white noise. Further, the SVMFN uses a new definition of fuzzy density that incorporates accuracy and uncertainty of the classifiers to improve recognition reliability to classify nine digital modulation types （i.e. 2ASK, 2FSK, 2PSK, 4ASK, 4FSK, 4PSK, 16QAM, MSK, and OQPSK）. Computer simulation shows that the proposed scheme has the advantages of high accuracy and reliability （success rates are over 98% when SNR is not lower than 0dB）, and it adapts to engineering applications.

关键词： modulation classification wavelet packet transform modulus maxima matrix support vector machine,fuzzy density.

Review of Fault-tolerant Control for Motor Inverter Failure with Operational Quality Considered

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 202-215页

作者： Yuxuan Du Wenxiang Zhao yihua hu Jinghua Ji Tao Tao IEEE School of Electrical and Information Engineering Jiangsu University Department of Engineering King’s College London

In recent years,motor drive systems have garnered increasing attention due to their high efficiency and superior control *** is especially apparent in aerospace,marine propulsion,and electric vehicles,where high performance,efficiency,and reliability are *** ability of the drive system to maintain long-term fault-tolerant control(FTC)operation after a failure is *** likelihood of inverter failures surpasses that of other components in the drive system,highlighting its critical ***-term FTC operation ensures the system retains its fundamental functions until safe repairs or replacements can be *** focus of developing a FTC strategy has shifted from basic FTC operations to enhancing the post-fault quality to accommodate the realities of prolonged operation *** paper primarily investigates FTC strategies for inverter failures in various motor drive systems over the past *** strategies are categorized into three types based on post-fault operational quality:rescue,remedy,and *** paper discusses each typical control strategy and its research focus,the strengths and weaknesses of various algorithms,and recent advancements in ***,this review summarizes effective FTC techniques for inverter failures in motor drive systems and suggests directions for future research.

关键词： Fault-tolerant Motor drive Operation quality Inverter failure

Review of Inductance Identification Methods Considering Inverter Nonlinearity for PMSM

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Chinese Journal of Electrical Engineering 2024年第2期10卷 1-15页

作者： Qiwei Wang Jiqing Xue Gaolin Wang yihua hu Dianguo Xu School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150000China Department of Engineering King’s College LondonLondon WC2R 2LSUK

Permanent magnet synchronous motors(PMSMs)are widely used in high-power-density and flexible control ***,the inductance changes significantly in real-time machine operations because of magnetic saturation and coupling ***,the identification of inductance is crucial for PMSM *** inductance identification methods are primarily based on the voltage source inverter(VSI),making inverter nonlinearity one of the main error sources in inductance *** improve the accuracy of inductance identification,it is necessary to compensate for the inverter nonlinearity *** this study,an overview of the PMSM inductance identification and the related inverter nonlinearity self-learning methods are presented.

关键词： Inductance identification inverter nonlinearity self-learning permanent magnet synchronous motor

Overview on Fault-Tolerant Four-Switch Three-Phase Voltage Source Converters

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Chinese Journal of Electrical Engineering 2017年第2期3卷 87-101页

作者： Kai Ni yihua hu Yang Liu Chun Gan Department of Electrical Engineering and Electronics University of LiverpoolLiverpool L693GJUK School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China Department of Electrical Engineering University of TennesseeKnoxvilleUSA

With the rapid development and widespread applications of power electronic converters,strong fault-tolerant capability of power electronic converters is required since they play important roles in power *** this paper,a review of one of the most promising fault-tolerant topologies for semiconductor open-circuit fault,called four-switch three-phase(FSTP)topology,is presented in terms of modeling analysis,modulation techniques,and control *** configuration of FSTP voltage source converter(VSC)is *** minimize the negative effects caused by the innate drawbacks of this fault-tolerant converter topology,considerable research has been carried out regarding modulation techniques and control *** modulation principle for FSTP topology is explained in detail,since the performance of FSTP VSCs relies on *** paper aims to illustrate current research progress on this fault-tolerant FSTP VSC topology.

关键词： Fault-tolerant ability four-switch three-phase(FSTP)topology voltage source converter(VSC) modeling analysis modulation techniques control strategies

Parameter Deviation Effect Study of the Power Generation Unit on a Doubly-Fed Induction Machine-based Shipboard Propulsion System

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CES Transactions on Electrical Machines and Systems 2020年第4期4卷 339-348页

作者： Kai Ni yihua hu Chun Gan State Key Laboratory of Advanced Electromagnetic Engineering and Technology the School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanHubei 430074China Department of Electronics Engineering HeslingtonUniversity of YorkYorkYO105DDU.K.

To lower the difficulty of fault protection,a doubly-fed induction machine based shipboard propulsion system(DFIM-SPS)that is partially power decoupled is *** such an intrinsically safe SPS architecture,a synchronous generator(SG)is employed for power generation,and the accuracy of the parameters of power generation unit(PGU)plays an important role in SPS stable *** this paper,the PGU parameter deviations are studied to evaluate the effects on system *** models of salient-pole SG,type DC1A excitation system(EXS)and DFIM are illustrated ***,the corresponding control scheme is *** the 16 important parameters of PGU,up to 40%of parameter deviations are applied to implement parameter sensitivity ***,simulation studies are carried out to evaluate the parameter deviation effects on system performance in *** defining three parameter deviation effect indicators(PDEIs),the effects on the PGU output variables,which are the terminal voltage and output active power,are ***,the increasing rates of PDEIs with different degrees of parameter deviations for the key parameters are ***,the overall system performance is investigated for the two most influential PGU *** paper provides some vital clues on SG and EXS parameter identification for DFIM-SPS.

关键词： shipboard propulsion system partially power decoupled doubly-fed induction machine synchronous generator parameter deviation

Multi-Objective Optimization of Surface-Mounted and Interior Permanent Magnet Synchronous Motor Based on Taguchi Method and Response Surface Method

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Chinese Journal of Electrical Engineering 2018年第1期4卷 67-73页

作者： Jikai Si Suzhen Zhao Haichao Feng Ruiwu Cao yihua hu School of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo 454003China School of Automation Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Electrical Engineering and Electronics University of LiverpoolLiverpoolUK

The surface-mounted and interior permanent magnet synchronous motor(SIPMSM)has the characteristics of multiple variables,strong coupling and *** order to improve the performance of SIPMSM,this paper presents a multi-objective optimal design process using Taguchi and response surface methodology(RSM).The peak value of cogging torque(PVCT),ratio value of average torque and permanent magnet weight(RTW),torque ripple and back-EMF total harmonics distortion(ETHD)are selected as optimization *** experiment matrix is established by Taguchi method,and analyzed the tendency and proportion of the effect of the optimization parameters on SIPMSM *** rules of choosing multi-objective optimization parameters are *** least-squares method is used to establish the optimal objective function,and RSM is used to obtain the resolutions of the optimization objective *** the initial performance with optimized performance verifies the effectiveness of the proposed method.

关键词： Surface-mounted and interior permanent magnet synchronous motor(SIPMSM) multi-objective optimization Taguchi response surface methodology(RSM) least-square method

Configurations and Control of Traction Motors for Electric Vehicles:A Review

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Chinese Journal of Electrical Engineering 2017年第3期3卷 1-17页

作者： Saqib Jamshed Rind Yaxing Ren yihua hu Jibing Wang Lin Jiang Department of Electrical Engineering and Electronics The University of LiverpoolL693BXUK Sicher Elevator Co. Ltd.Huzhou 313009China

In recent decades,worldwide global warming and reduction in petroleum resources have accelerated researcher’s attention to produce alternative sustainable and environmentally clean transportation *** of vehicular technology is capable of curbing the environmental pollution problem in an efficient and effective way,due to high efficiency electric motors,development and advancement in the field of power electronic devices,digital signal processing and advanced control *** article presents a comprehensive review on different configurations/architecture of electric vehicles(EVs)and hybrid electric vehicles(HEVs),traction motors for electric propulsion system and high performance speed sensorless control of traction *** basic architecture key components of hybrid vehicle and different power train configurations with respect to applications and limitations are *** integral part of electric propulsion system,traction motor classes for desired operational characteristics and limitations are summarized from a system perspective with the latest *** performance traction motor control techniques are discussed with respect to automotive ***,speed sensorless control techniques research trends as well as an extensive review on rotor speed estimation techniques for robust and efficient sensorless traction drive control are *** article provides state of the art key global trends and tradeoff of various technologies with future trends and potential areas of research.

关键词： Electric vehicle architecture vehicle powertrain configurations traction motors traction drive control motor sensorless control

Multi-stage Virtual Over-sample Digital Hystersis Control

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中国电机工程学报 2012年第36期32卷 I0001-I0022,21页

作者： hu yihua DENG Yan LIU Quanwei TAO Yong Zhejiang University

并网电流控制是分布式发电系统中的技术难点。在分析传统滞环控制策略的基础上，针对不对称多电平拓扑研究了一种分段式虚拟过采样并网滞环控制策略。通过将母线电压按正弦波形分段的方法，可以有效分配开关管开关频率，降低输出电流的... 详细信息

并网电流控制是分布式发电系统中的技术难点。在分析传统滞环控制策略的基础上，针对不对称多电平拓扑研究了一种分段式虚拟过采样并网滞环控制策略。通过将母线电压按正弦波形分段的方法，可以有效分配开关管开关频率，降低输出电流的谐波含量。在真实采样点之间插入虚拟采样点的虚拟过采样方法，解决了滞环控制中环宽失效问题。利用仿真软件对多种滞环控制策略进行对比分析，搭建实验平台对提出的算法进行实验验证。仿真与实验结果都验证了所提控制算法的正确性。

关键词：滞环控制采样数滞环电流控制分布式发电系统虚拟多级无差拍控制单周期控制

Laser altimeter of CE-1 payloads system

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Science China(Physics,Mechanics & Astronomy) 2010年第10期53卷 1914-1920页

作者： WANG JianYu Shu Rong CHEN WeiBiao JIA JianJun WANG BingYong huANG Genghua hu yihua HOU Xia Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China Shanghai Institute of Fine Optical Mechanical Chinese Academy of SciencesShanghai 201800China

The design and operation of the Laser Altimeter of CE-1 Payloads System are presented in this *** paper includes the design of the system and spacecraft-level laser,the description of the emitting-system and receiving system,and the testing of the laser *** CE-1 laser altimeter is the first Chinese deep-space probe using a *** has one beam and operates at 1 Hz,with a nominal accuracy of 5 *** laser altimeter has operated successfully in lunar orbit since November 28,*** has obtained 9120 thousand data values about the lunar altitude.

关键词： CE-1 orbiter laser altimeter system design