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Fault Diagnosis Method for Open-circuit Faults in NPC Three-level Inverter based on WKCNN 认领 引用 被引量：2
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作者 Guozheng Zhang Menghui Li +1 位作者 Xin Gu Wei Chen 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2025年第2期234-245,共12页
With the increasing demand for high reliability and availability in power conversion equipment within power electronics systems,the fault diagnosis of neutral-point-clamped(NPC) three-level inverters has garnered wide... With the increasing demand for high reliability and availability in power conversion equipment within power electronics systems,the fault diagnosis of neutral-point-clamped(NPC) three-level inverters has garnered widespread attention.To address the challenges of fault feature extraction,this article proposes an end-to-end diagnostic approach based on a wavelet kernel convolutional neural network (WKCNN),capable of extracting multi-scale features from current signals to significantly enhance diagnostic accuracy.This method directly uses raw three-phase current signals as input,applying wavelet kernel convolution to automatically capture frequency-domain fault features,combined with a Softmax classifier optimized by the Adam algorithm to achieve fault diagnosis for NPC threelevel inverters.Experimental results under various operating conditions demonstrate that this approach maintains robust diagnostic accuracy across multiple fault scenarios,with comparative analysis further confirming its advantages in diagnostic efficiency and performance over traditional machine learning and other deep learning methods. 展开更多
关键词 NPC three-level inverter Open-circuit fault Wavelet transform Convolutional neural network End-to-end
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Online Estimation of DC-link Capacitor Parameters of Three-Level NPC Converters Using Inherent Signals Analysis 认领 引用
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作者 Ricardo Lucio de Araujo Ribeiro Reuben Palmer Rezende de Sousa +2 位作者 Alexandre Cunha Oliveira Antonio Marcus Nogueira Lima Qing-Long Han 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第7期1434-1444,共11页
This paper presents a method for estimating the parameters of DC-link capacitors in three-level NPC voltage source inverters(3L-NPC-VSI)used in grid-tied systems.The technique uses the signals generated by the intermo... This paper presents a method for estimating the parameters of DC-link capacitors in three-level NPC voltage source inverters(3L-NPC-VSI)used in grid-tied systems.The technique uses the signals generated by the intermodulation caused by the PWM strategy and converter topology interaction to estimate the capacitor parameters of the converter DC-link.It utilizes an observer-based structure consisting of a recursive noninteger sliding discrete Fourier transform(rnSDFT)and an RLS filter improved with a forgetting factor(oSDFT-RLS)to accurately estimate the capacitance and equivalent series resistance(ESR).Importantly,this method does not require additional sensors beyond those already installed in off-the-shelf 3L-NPC-VSI systems,ensuring its noninvasiveness.Furthermore,the oSDFTRLS estimates capacitor parameters in the time-frequency domain,enabling the tracking of capacitor degradation and predicting potential faults.Experimental results from the laboratory setup demonstrate the effectiveness of the proposed condition monitoring method. 展开更多
关键词 Aluminum electrolytic capacitors(AEC) condition monitoring forgetting factor inherent signals parameter estimation recursive least squares(RLS) sliding discrete Fourier transform(SDFT) three-level NPC converter
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A Low Common-Mode Voltage Virtual Space Vector Modulation of Three-Level Converters for Doubly-Fed Variable-Speed Pumped Storage Systems 认领 引用
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作者 Ziqiang Man Lei Zhao +6 位作者 Zheng Tao Shiming Cheng Wei Yan Gaoyue Zhong Yu Lu Wenming Zhang Li Zhang 《Energy Engineering》 EI 2025年第9期3555-3572,共18页
With the rapid integration of renewable energy sources,modern power systems are increasingly challenged by heightened volatility and uncertainty.Doubly-fed variable-speed pumped storage units(DFVS-PSUs)have emerged as... With the rapid integration of renewable energy sources,modern power systems are increasingly challenged by heightened volatility and uncertainty.Doubly-fed variable-speed pumped storage units(DFVS-PSUs)have emerged as promising technologies for mitigating grid oscillations and enhancing system flexibility.However,the excitation converters in DFVS-PSUs are prone to significant issues such as elevated common-mode voltage(CMV)and neutral-point voltage(NPV)fluctuations,which can lead to electromagnetic interference and degrade transient performance.To address these challenges,an optimized virtual space vector pulse width modulation(OVSVPWM)strategy is proposed,aiming to suppress CMV and NPV simultaneously through coordinated multi-objective control.Specifically,a dynamic feedback mechanism is introduced to adjust the balancing factor of basic vectors in the synthesized virtual small vector in real-time,achieving autonomous balancing of the NPV.To address the excessive switching actions introduced by the OVSVPWM strategy,a phase duty ratio-based sequence reconstruction method is adopted,which reduces the total number of switching actions to half of the original.A zero-level buffering scheme is employed to reconstruct the single-phase voltage-level output sequence,achieving peak CMV suppression down to udc/6.Simulation results demonstrate that the proposed strategy significantly improves electromagnetic compatibility and operational stability while maintaining high power quality. 展开更多
关键词 Doubly-fed variable-speed pumped storage units three-level excitation converter common-mode voltage neutral-point voltage virtual space voltage vector
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A New DC Side Capacitance Voltages Balancing Method for Three-level Inverters Based on Hybrid Space Vector Modulation 认领 引用 被引量：6
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作者 Fan Bishuang Tan Guanzheng +1 位作者 Fan Shaosheng Deng zelin 《中国电机工程学报》 EI CSCD 北大核心 2012年第27期I0017-I0017,共1页
Three-level neutral point clamped(NPC)inverters have been widely applied in the high voltage and high power drive fields.The capacitance voltage balancing algorithm is a hot topic that many specialists and scholars ha... Three-level neutral point clamped(NPC)inverters have been widely applied in the high voltage and high power drive fields.The capacitance voltage balancing algorithm is a hot topic that many specialists and scholars have been working on.V arious capacitance voltage balancing strategies have been studied,in which the redundant short vectors are not fully utilized.In order to increase the capacitance voltage control effect of the short vectors,a new algorithm is proposed. 展开更多
关键词 Three-level Inverter Virtual vector,Hybrid Space Vector Modulation Capacitance Voltage Balancing Time distribution factor
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Enhanced cooling of a V-type three-level atom in an optical cavity 认领 引用 被引量：4
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作者 刘利伟 谭磊 +2 位作者 丁彩英 张玉清 谭文婷 《Chinese Physics B》 SCIE EI CAS 2008年第10期3662-3667,共6页
We have studied theoretically and numerically the enhanced cooling of a V-type three-level atom in a high-finesse optical cavity and shown that the cooling rate can be increased by one order of magnitude over that of ... We have studied theoretically and numerically the enhanced cooling of a V-type three-level atom in a high-finesse optical cavity and shown that the cooling rate can be increased by one order of magnitude over that of a two-level atom, and the momentum amplitude tends to a stationary state much smaller than that of a two-level atom. We have further shown that the cooling rate can be significantly improved by using feedback and a time-dependent pump. 展开更多
关键词 cavity cooling three-level atom enhanced cooling
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Teleportation of Three-Level Multi-partite Entangled State by a Partial Three-Level Bipartite Entangled State 认领 引用 被引量：8
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作者 DAI Hong-Yi ZHANG Ming LI Cheng-Zu 《Communications in Theoretical Physics》 SCIE CAS 2008年第4期891-894,共4页
We present a scheme for probabilistically teleporting an unknown three-level bipartite entangled state by using a partial entangled three-level bipartite state as quantum channel This scheme can be directly generalize... We present a scheme for probabilistically teleporting an unknown three-level bipartite entangled state by using a partial entangled three-level bipartite state as quantum channel This scheme can be directly generalized to probabilistically teleport an unknown three-level k-particle entangled state by a partial three-level bipartite entangled state. A11 kinds of unitary transformations are given in detail We calculate the successful total probability and the total classical communication cost required for this scheme. 展开更多
关键词 teleportation three-level multi-partite entangled state classical communication cost
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Hybrid decompression technique and two-level corpectomy are effective treatments for three-level cervical spondylotic myelopathy 认领 引用 被引量：8
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作者 Yong LIU Ke-yi YU Jian-hua HU 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS 2009年第9期696-701,共6页
The optimal surgical strategy for multilevel cervical spondylotic myelopathy(CSM)has not been defined,and few comparative researches between hybrid decompression and multilevel corpectorny have been conducted.Here,we ... The optimal surgical strategy for multilevel cervical spondylotic myelopathy(CSM)has not been defined,and few comparative researches between hybrid decompression and multilevel corpectorny have been conducted.Here,we reported 28 patients of three-level CSM,of whom 12 underwent hybrid decompression and 16 two-level corpectomy,with each type of procedure chosen according to radiologic characteristics of those patients.Clinical and radiologic parameters of both groups showed various degrees of improvement.However,no statistically significant differences in Japanese Orthopedic Association(JOA)score improvement rate,graft fusion rate,post-operative neck disability index(NDI)or segmental lordosis between the two groups were found.We conclude that both hybrid decompression and two-level corpectomy could obtain satisfying clinical efficacy in the management of three-level CSM for appropriate patients. 展开更多
关键词 Three-level cervical spondylotic myelopathy(CSM) Hybrid decompression Corpectomy
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Optical power limiting of ultrashort hyper-Gaussian pulses in cascade three-level system 认领 引用 被引量：2
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作者 Ji-Cai Liu Fen-Fen Guo +1 位作者 Ya-Nan Zhao Xing-Zhe Li 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第10期357-361,共5页
Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell–Bloch equations by the iterative predictor-corrector finite-difference t... Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell–Bloch equations by the iterative predictor-corrector finite-difference time-domain method.Optical power limiting behavior induced by strong nonlinear two-photon absorption is observed for different orders of the femtosecond hyper-Gaussian pulses. Pulses of a higher order temporal profile are found to have a wider power range of optical limiting but a larger output saturation intensity. Both the output saturation value and the damage threshold of optical power limiting decrease with pulse duration increasing. The decrease of the pulse area along the pulse propagation is much slower than that obtained from the two-photon area theorem due to invalidity of the slowly varying amplitude approximation and the monochromatic field hypothesis. 展开更多
关键词 optical power limiting two-photon absorption ultrashort hyper-Gaussian pulse cascade three-level system
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Radiation forces on a three-level atom in the high-order Bessel beams 认领 引用 被引量：5
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作者 王正岭 印建平 《Chinese Physics B》 SCIE EI CAS 2008年第7期2466-2477,共12页
The general expressions of the average dissipative and dipole forces acting on a A-configuration three-level atom in an arbitrary light field are derived by means of the optical Bloch equations based on the atomic den... The general expressions of the average dissipative and dipole forces acting on a A-configuration three-level atom in an arbitrary light field are derived by means of the optical Bloch equations based on the atomic density matrix elements, and the general properties of the average dissipative and dipole forces on a three-level atom in the linearly-polarized high-order Bessel beams （HBBs） are analysed. We find a resonant property （with two resonant peaks） of the dissipative force and a non-resonant property （with two pairs of non-resonant peaks） of the dipole force on the three-level atom, which are completely different from those on the two-level atom. Meanwhile we find a saturation effect of the average dissipative force in the HBB, which comes from the saturation of the upper-level population. Our study shows that the general expressions of the average dissipative and dipole forces on the three-level atom will be simplified to those of the two-level atom under the approximation of large detuning. Finally, we study the axial and azimuthal Doppler cooling of atoms in ID optical molasses composed of two counter-propagating HBBs and discuss the azimuthal influence of the HBB on the Doppler cooling limit. We also find that the Doppler limit of atoms in the molasses HBB is slightly below the conventional Doppler limit of hГ/（2kB） due to the orbital angular momentum lh of the HBB. 展开更多
关键词 radiation forces optical Bloch equations three-level atom azimuthal Doppler cooling
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Mechanical effects of light on the ■-type three-level atom in a high-finesse optical cavity 认领 引用 被引量：2
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作者 刘利伟 谭磊 黄刚 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第1期377-384,共8页
A theoretical study is carried out for the modification and implication of the effect on the type three level atom in a high-finesse optical cavity driven by light field including spontaneous emission and the cavity d... A theoretical study is carried out for the modification and implication of the effect on the type three level atom in a high-finesse optical cavity driven by light field including spontaneous emission and the cavity decay. Analytic expressions for the dipole force, the friction force, the optical potentials and the friction coefficient are obtained. Then the numerical and graphical methods are used to investigate the friction coefficient with the controlling parameters. It is shown that the friction coefficient is strongly dependent on the controlling parameters. The cooling rate can increase by one order of magnitude more than that of a two-level atomic system. The reason can be given using the dressed states and the Sisyphus cooling mechanism, which would stimulate further experimental investigations. 展开更多
关键词 three-level atom mechanical effects high finesse optical cavity
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Quantum coherence in A-three-level system driven by bichromatic coupling field 认领 引用 被引量：1
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作者 杨丽君 赵敏 +3 位作者 张连水 冯晓敏 李晓莉 尉长江 《Chinese Physics B》 SCIE EI CAS 2010年第8期406-410,共5页
We present a theoretical study of quantum coherent effects in a A-three-level system with a strong bichromatic coupling field and a weak probe field. When one component of the strong bichromatic coupling field is reso... We present a theoretical study of quantum coherent effects in a A-three-level system with a strong bichromatic coupling field and a weak probe field. When one component of the strong bichromatic coupling field is resonant with a corresponding transition and the other is detuning with an integer fraction of the Rabi frequency of the resonant field, the absorption spectrum exhibits a series of symmetrical doublets. While two frequencies of the strong bichromatic coupling field are symmetrically detuned from the transition, the position and the relative intensity of the absorption peak are both affected by the coupling field intensity and detuning. An explanation of the spectrum is given in term of the dressed-state formalism. 展开更多
关键词 three-level system bichromatic coupling field dressed state quantum coherence
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Control Method of Three-level Neutral-point-clamped Inverter Based on Voltage Vector Diagram Partition 认领 引用 被引量：2
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作者 宋文祥 姚钢 +1 位作者 陈陈 陈国呈 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第4期457-461,共5页
A new modulation approach was presented for the control of neutral-point （NP） voltage variation in the three-level NP-clamped voltage source inverter, and the average NP current model was established based on vector... A new modulation approach was presented for the control of neutral-point （NP） voltage variation in the three-level NP-clamped voltage source inverter, and the average NP current model was established based on vector diagram partition. Thus, theory base was built for balancing control of NP potential. Theoretical analysis and experimental results indicate that the proposed method for NP balancing control vector synthe- sizing concept based can make the average NP current zero, and do not influence NP potential within every sample period. The effectiveness of proposed research approach was verified by simulative and experimental results. 展开更多
关键词 three-level inverter variation mechanism of neutral-point potential balancing control method
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Generation of the nonlocal quantum entanglement of three three-level particles by local operations 认领 引用 被引量：2
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作者 金星日 张英俏 +1 位作者 金哲 张寿 《Chinese Physics B》 CAS 2005年第10期1936-1941,共6页
We propose a scheme to realize the nonlocal quantum entanglement of three three-level particles by using a threeparticle entangled state of three levels as a quantum channel with the aid of some local unitary transfor... We propose a scheme to realize the nonlocal quantum entanglement of three three-level particles by using a threeparticle entangled state of three levels as a quantum channel with the aid of some local unitary transformations. This scheme can be directly generalized to the nonlocal quantum entanglement of N three-level particles. 展开更多
关键词 quantum entanglement three-level particle unitary transformation
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A scheme for conditional quantum phase gate via bimodal cavity and a∧-type three-level atom 认领 引用 被引量：2
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作者 蔡建武 方卯发 +1 位作者 廖湘平 郑小娟 《Chinese Physics B》 CAS 2006年第11期2518-2522,共5页
We propose a scheme to implement a two-qubit conditional quantum phase gate for the intracavity field via a single three-level ∧-type atom driven by two modes in a high-Q cavity. The quantum inforraation is encoded o... We propose a scheme to implement a two-qubit conditional quantum phase gate for the intracavity field via a single three-level ∧-type atom driven by two modes in a high-Q cavity. The quantum inforraation is encoded on the Fock states of the bimodal cavity. The gate＇s averaged fidelity is expected to reach 99.8%. 展开更多
关键词 quantum phase gate ∧-type three-level atom bimodal cavity fidelity
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Interaction of a pair coherent state with a three-level Λ-type atom and generation of a modified Bessel-Gaussian state with a vortex structure 认领 引用 被引量：1
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作者 唐慧琴 李绍新 +2 位作者 唐英 郑小娟 朱开成 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第2期115-119,共5页
The evolution of a system state is derived based on the nonresonant interaction of a three-level ＂Λ＂ type atom with two cavity modes at a pair coherent state and two classic fields,and a cavity field state is analy... The evolution of a system state is derived based on the nonresonant interaction of a three-level ＂Λ＂ type atom with two cavity modes at a pair coherent state and two classic fields,and a cavity field state is analyzed in detail under conditional detecting.It is found that the quantized modified Bessel-Gaussian states as well as the superposition states consisting of the quantized vortex states with different weighted coefficients may be prepared through carefully preparing an initial atomic state and appropriately adjusting the interaction time.The scheme provides an additional choice to realize the two-mode quantized vortex state within the context of cavity quantum electrodynamics（QED）. 展开更多
关键词 quantized vortex state three-level Λ-type atom cavity quantum electrodynamics（QED）
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Emission spectrum of a harmonically trapped Λ-type three-level atom 认领 引用 被引量：2
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作者 郭红 汤佩 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第5期310-314,共5页
We theoretically investigate the emission spectrum for a A-type three-level atom trapped in the node of a standing wave. We show that the atomic center-of-mass motion not only directly affects the peak number, peak po... We theoretically investigate the emission spectrum for a A-type three-level atom trapped in the node of a standing wave. We show that the atomic center-of-mass motion not only directly affects the peak number, peak position, and peak height in the atomic emission spectrum, but also influences the effects of the cavity field and the atomic initial state on atomic emission spectrum. 展开更多
关键词 emission spectrum the atomic center-of-mass motion A-type three-level atom
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A neutral-point potential balance control strategy for three-level inverter based on VSVPWM 认领 引用 被引量：1
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作者 CHENG Dong-liang WANG Xiao-peng +1 位作者 ZHU Tian-liang MA Wen-gang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2018年第4期397-404,共8页
The topology of diode neutral-point-clamped(NPC)three-level inverter is prone to neutral-point potential offset.When the sum of three-phase current is zero,the virtual space vector pulse width modulation(VSVPWM)scheme... The topology of diode neutral-point-clamped(NPC)three-level inverter is prone to neutral-point potential offset.When the sum of three-phase current is zero,the virtual space vector pulse width modulation(VSVPWM)scheme does not cause the neutral-point voltage offset,but it lacks the ability to balance the deviation.For this reason,a neutral-point potential control strategy combining virtual space vector modulation and loop width control is proposed.The neutral-point potential is balanced by introducing the distribution factor for the regions with redundant vectors.For other regions,the potential is controlled by selecting a suitable switching sequence.Meanwhile,the effect on the virtual vector modulation is reduced within the loop width by setting an appropriate loop width,thereby improving the balance effect.The simulation results show that the proposed method has a strong ability to control the offset and has excellent potential balance performance under the conditions of balanced load,unbalanced load and asymmetric capacitance parameters. 展开更多
关键词 three-level inverter virtual space vector pulse width modulation(VSVPWM) neutral-point potential balance switching sequence
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Model predictive flux control of permanent magnet synchronous motor driven by three-level inverter based on fine-division strategy 认领 引用 被引量：1
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作者 MIAO Zhongcui LI Haiyuan +1 位作者 HE Yangyang WANG Yunkun 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第4期439-450,共12页
Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control(MPTC)for permanent magnet synchronous motor(PMSM)driven by three-level inverter,a fine-division model... Aiming at the difficulty of setting the weight coefficient in the value function of model predictive torque control(MPTC)for permanent magnet synchronous motor(PMSM)driven by three-level inverter,a fine-division model predictive flux control(MPFC)method is proposed.First,establish a mathematical model between the motor torque and the stator flux linkage according to the mathematical equations of PMSM.Thus,the control of the motor torque and stator flux linkage in the MPTC is transformed into the control of a single stator flux linkage vector,omitting the cumbersome weight setting process in the traditional MPTC.The midpoint potential control strategy is proposed,which uses the characteristics of redundant small vectors to balance the midpoint potential.After that,a fine-division strategy is proposed,which effectively reduces the number of candidate vectors and the computational burden of the system.Finally,the proposed MPFC is compared with MPTC by simulation.The results show that the proposed fine-division MPFC effectively reduces the system calculation,and has the advantages of simple principle and better dynamic and steady-state control performance.The feasibility of the control strategy is verified. 展开更多
关键词 permanent magnet synchronous motor(PMSM) three-level inverter model predictive flux control(MPFC) weight coefficient midpoint potential
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Population Dynamics and Emission Spectrum of a Cascade Three-Level Jaynes-Cummings Model with Intensity-Dependent Coupling in a Kerr-like Medium 认领 引用 被引量：4
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作者 ZHOU Qing-Chun 《Communications in Theoretical Physics》 SCIE CAS 2006年第4期727-731,共5页
By using the method of eigenvectors, the atomic populations and emission spectrum are investigated in a system that consists of a cascade three-level atom resonantly interacting with a single-mode tield in a Kerr-like... By using the method of eigenvectors, the atomic populations and emission spectrum are investigated in a system that consists of a cascade three-level atom resonantly interacting with a single-mode tield in a Kerr-like medium. The atom and the field are assumed to be initially in the upper atomic state and the Fock state, respectively. Results for models with intensity-dependent coupling and with intensity-independent coupling are compared. It is found that both population dynamics and emission spectrum show no indications of atom-field decoupling in the strong field limit if the intensity-dependent coupling is taken into account. 展开更多
关键词 population emission spectrum cascade three-level atom Kerr-like medium
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Model predictive current control for PMSM driven by three-level inverter based on fractional sliding mode speed observer 认领 引用 被引量：5
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作者 TENG Qing-fang LUO Wei-duo 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第4期358-364,共7页
Based on the fractional order theory and sliding mode control theory,a model prediction current control(MPCC)strategy based on fractional observer is proposed for the permanent magnet synchronous motor(PMSM)driven by ... Based on the fractional order theory and sliding mode control theory,a model prediction current control(MPCC)strategy based on fractional observer is proposed for the permanent magnet synchronous motor(PMSM)driven by three-level inverter.Compared with the traditional sliding mode speed observer,the observer is very simple and eases to implement.Moreover,the observer reduces the ripple of the motor speed in high frequency range in an efficient way.To reduce the stator current ripple and improve the control performance of the torque and speed,the MPCC strategy is put forward,which can make PMSM MPCC system have better control performance,stronger robustness and good dynamic performance.The simulation results validate the feasibility and effectiveness of the proposed scheme. 展开更多
关键词 permanent magnet synchronous motor(PMSM) three-level inverter fractional sliding mode speed observer model predictive current control(MPCC)
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