Due to attractive features,including high efficiency,low device stress,and ability to boost voltage,a Vienna rectifier is commonly employed as a battery charger in an electric vehicle(EV).However,the 6k±1 harmoni...
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Due to attractive features,including high efficiency,low device stress,and ability to boost voltage,a Vienna rectifier is commonly employed as a battery charger in an electric vehicle(EV).However,the 6k±1 harmonics in the acside current of the Vienna rectifier deteriorate theTHDof the ac current,thus lowering the power ***,the current closed-loop for suppressing 6k±1 harmonics is essential tomeet the desired total harmonic distortion(THD).Fast repetitive control(FRC)is generally adopted;however,the deviation of power grid frequency causes delay link in the six frequency fast repetitive control to become non-integer and the tracking performance to *** paper presents the detailed parameter design and calculation of fractional order fast repetitive controller(FOFRC)for the non-integer delay *** finite polynomial approximates the non-integer delay link through the Lagrange interpolation *** comparing the frequency characteristics of traditional repetitive control,the effectiveness of the FOFRC strategy is ***,simulation and experiment validate the steadystate performance and harmonics suppression ability of FOFRC.
Rotating Space Slender Flexible Structures(RSSFS)are extensively utilized in space operations because of their light weight,mobility,and low energy *** realize the accurate space operation of the RSSFS,it is necessary...
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Rotating Space Slender Flexible Structures(RSSFS)are extensively utilized in space operations because of their light weight,mobility,and low energy *** realize the accurate space operation of the RSSFS,it is necessary to establish a precise mechanical model and develop a control algorithm with high ***,with the application of traditional control strategies,the RSSFS often suffers from the chattering phenomenon,which will aggravate structure *** this paper,novel deformation description is put forward to balance modeling accuracy and computational efficiency of the RSSFS,which is better appropriate for real-time ***,the Neural Network Sliding Mode Control(NNSMC)strategy modified by the hyperbolic tangent(tanh)function is put forward to compensate for modeling errors and reduce the chattering phenomenon,thereby improving the trajectory tracking accuracy of the ***,a mathematical model for the RSSFS is developed according to the novel deformation description and the vibration theory of flexible *** of the deformation accuracy between different models proves that the novel modeling method proposed has high modeling ***,the universal approximation property of the Radial Basis Function(RBF)neural network is put forward to determine and compensate for modeling errors,which consist of higher-order modes and the uncertainties of external *** addition,the tanh function is proposed as the reaching law in the conventional NNSMC strategy to suppress driving torque *** control law of modified NNSMC strategy and the adaptive law of weight coefficients are developed according to the Lyapunov theorem to guarantee the RSSFS ***,the simulation and physical experimental tests of the RSSFS with different control strategies are *** results show that the control law according to the novel deformation description and the modified NNSMC strategy can obta
In this paper, an optimized topology based on three-stage hybrid control of discontinuous conduction mode (DCM) and boundary conduction mode (BCM) for interleaved flyback micro-inverter is presented. In the proposed t...
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Neural architecture search(NAS)plays an important role in many computer vision ***,the high computational cost of forward and backward propagations during the search,process restricts its practical *** this paper,we p...
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Neural architecture search(NAS)plays an important role in many computer vision ***,the high computational cost of forward and backward propagations during the search,process restricts its practical *** this paper,we present the search process as a multi-armed bandit problem,where we take into account the uncertainty caused by the contradiction between the huge search space and limited number of *** NAS optimizes the trade-off between exploitation and exploration for a highly efficient ***,we sampled from a set of operations in one trial,where each operation was weighted by its trial performance and a bias to allow operations with less training to be *** further reduced the search space by abandoning the operation with the lowest potential,significantly reducing the search *** results on the CIFAR-10 dataset show that the resulting architecture achieves the most advanced precision with a search speed approximately two times faster than that of partially connected differentialble architecture *** ImageNet,we attained the most advanced top-1 accuracy of 75.3%with a search time of 1.8 GPU days.
With the development of convolutional neural networks, the scale of activation data has increased dramatically, posing significant challenges to model storage and computation. The insight indicates that the sparsity o...
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In this paper,we consider the robust output containment problem of linear heterogeneous multi-agent systems under fixed directed networks.A distributed dynamic observer based on the leaders’measurable output was desi...
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In this paper,we consider the robust output containment problem of linear heterogeneous multi-agent systems under fixed directed networks.A distributed dynamic observer based on the leaders’measurable output was designed to estimate a convex combination of the leaders’***,for the case of followers with identical state dimensions,distributed dynamic state and output feedback control laws were designed based on the state-coupled item and the internal model compensator to drive the uncertain followers into the leaders’convex hull within the output regulation ***,we extended theoretical results to the case where followers have nonidentical state *** establishing virtual errors between the dynamic observer and followers,a new distributed dynamic output feedback control law was constructed using only the states of the compensator to solve the robust output containment ***,two numerical simulations verified the effectiveness of the designed schemes.
This paper discusses the data-driven design of linear quadratic regulators,i.e.,to obtain the regulators directly from experimental data without using the models of *** particular,we aim to improve an existing design ...
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This paper discusses the data-driven design of linear quadratic regulators,i.e.,to obtain the regulators directly from experimental data without using the models of *** particular,we aim to improve an existing design method by reducing the amount of the required experimental *** the data amount leads to the cost reduction of experiments and computation for the data-driven *** present a simplified version of the existing method,where parameters yielding the gain of the regulator are estimated from only part of the data required in the existing *** then show that the data amount required in the presented method is less than half of that in the existing method under certain *** addition,assuming the presence of measurement noise,we analyze the relations between the expectations and variances of the estimated parameters and the *** a result,it is shown that using a larger amount of the experimental data might mitigate the effects of the noise on the estimated *** results are verified by numerical examples.
Accurate calculation of short-circuit electromagnetic force is crucial for both mechanical strength check and the optimal design of gas-insulated transmission lines(GIL).Since the full 3D numerical simulation method i...
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Accurate calculation of short-circuit electromagnetic force is crucial for both mechanical strength check and the optimal design of gas-insulated transmission lines(GIL).Since the full 3D numerical simulation method is highly time-consuming,a novel lightweight 2D multi-slice electromagnetic field-circuit coupled method for computing transient electromagnetic force is proposed,where appropriate port voltage degrees of freedom(DoFs)are introduced for the solid GIL conductor *** the transient magnetic field equations are combined with the constraint equations of circuit part,including nodal voltage and loop current DoFs,a direct field-circuit coupling scheme is thus *** proposed method can simultaneously consider the effect of interphaseshunts and ground wires,as well as the skin effect and proximity *** can accurately capture the transient electromagnetic characteristics of GIL spanning from several to tens of kilometers under different short-circuit *** transient electromagnetic forces,as well as the induced voltages and currents of the enclosure,are analysed by the proposed method for both single-phase and three-phase enclosed GIL under various short-circuit *** proposed method has the advantages of high accuracy and lightweight computational cost,and thus it is also suitable for conducting important simulation tasks such as mechanical strength checks during the design optimisation phase of long-distance GIL.
This paper reports the photocapacitance effect of silicon-based single-photon avalanche diodes(SPADs),and the frequency scattering phenomenon of *** test results of the small-signal capacitance-voltage method show tha...
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This paper reports the photocapacitance effect of silicon-based single-photon avalanche diodes(SPADs),and the frequency scattering phenomenon of *** test results of the small-signal capacitance-voltage method show that light can cause the capacitance of a SPAD device to increase under low-frequency conditions,and the photocapacitance exhibits frequency-dependent *** the devices are fabricated based on the standard bipolar-CMOS-DMOS process,this study attributes the above results to the interfacial traps formed by Si-SiO_(2),and the illumination can effectively reduce the interfacial trap lifetime,leading to changes in the junction capacitance inside the ***,an equivalent circuit model considering the photocapacitance effect is also proposed in this *** analysis of the capacitance characteristics of SPAD has important scientific significance and application value for studying the energy level distribution of device interface defect states and improving the interface quality.
Based on conventional interleaved flyback micro-inverter in discontinuous conduction mode (DCM), a novel auxiliary active clamp circuit is proposed. This converter utilizes an auxiliary branch to recover the stored en...
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