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In the operation of a photovoltaic system, one of the most important issues is absorbing maximum power from the PV array under continuous and rapid changing irradiance condition. The sampling points obtained at different moments are not on the PV characteristic curve with the same irradiance, so the MPPT strategy may misjudge. In this paper, a novel method to track the MPP is presented, which is based...
This paper presents a proportional harmonic power sharing (PHPS) control scheme to improve the voltage quality at point of common coupling (PCC) and share harmonic power simultaneously for an islanded microgrid. The proposed control strategy employs P+ multiple resonant controller, and P+ plus Q+-based improved droop control scheme to improve the voltage quality at the load bus. Additionally, the...
The virtual inertia J in single-phase synchronverter (SPSV) can be designed specifically to improve system stability. However, J also relates to active power loop (APL) and reactive power loop (RPL) time constants, which restricts the flexibility of control parameters choice and increases the complexity of parameter design process. This paper proposes a method to increase SPSV overall inertia without...
The stability analysis of multi-stage DC-DC converters system is a big challenge, since the interaction among the individual converters can lead to an instability of the whole system. This paper applied the stability analysis method based on Floquet theory for a three-stage DC-DC converters system. In this paper, the stability analysis method based on Floquet theory is reviewed at the beginning. Following,...
This paper proposes a parameter design method to optimize the single-phase synchronverter (SPSV) dynamic stability considering the influence of low-pass filter, which in the torque measurement loop and reactive power measurement loop is essential for SPSV to filter out twice the line-frequency power oscillation. The oscillation is inherent from the character of single-phase power calculation. However,...
To solve the simulation convergence problem of Silicon Carbide metal-oxide semiconductor field effect transistor (SiC MOSFET) models, this paper proposes a non-segmented model for SiC MOSFETs, which uses non-segmented, smooth continuous equations to describe the static and dynamic characteristics of SiC MOSFET. Further, the static characteristic of SiC MOSFET obtained by the non-segmented model is...
Ferrite chokes are often applied to suppress electromagnetic interference (EMI) in power converters. In this paper, an improved ferrite choke RLC model and its parameters determination method are proposed. The improved ferrite choke RLC model can overcome the limitation of the existing RLC model in the low frequency band, and the proposed parameters determination method can calculate the values of...
This paper deals with model reduction by balanced truncation of fault tolerant switched systems. The conditions, which guarantee the stability of fault tolerant switched system and the error between the states of switched system and reduced order switched system is in a certain range, are proposed. It shows that fault tolerant switched system can be reduced by the same truncated of original switched...
This paper presents a CMOS capacitance-to-digital converter (CDC) for capacitive sensors applications. Off-chip capacitive sensors are fabricated by coating sensing materials on interdigitated electrode (IDE) structure. A CDC consists of a capacitance-to-voltage front-end and 12-bit successive approximation register analog-to-digital converter (SAR-ADC) in a single chip is used for converting sensor...
In this paper, a conducted electromagnetic interference (EMI) analysis method for traction drive system in high speed trains based on the equivalent circuit of EMI coupling paths is proposed. The conducted EMI of the traction drive system is analyzed, and equivalent circuit of EMI paths is established. Moreover, the influence rules of parasitic parameters on EMI spectrum distribution are analyzed...
In modern society, social networks play an important role for online users. However, one unignorable problem behind the booming of the services is privacy issues. This paper conducts an extensive study to infer sensitive personal information from public insensitive attributes in social networks by deploying different machine learning algorithms. The results show that several algorithms can achieve...
User authentication in computer systems has been a cornerstone of computer security for decades. However, the existing user authentication schemes either require human cognitive ability to remember numerous complex id and password, or rely on a trusted third party which could fail due to technical failure or denial-of-service attacks. In this paper, we design a fully distributed user authentication...
In this work, a hybrid plasmonic microfiber knot resonator (HPMKR) is demonstrated as well as its multi-sense applications. A microfiber knot resonator (MKR) is attached to gold film and generates the hybrid plasmonic mode. The HPMKR has an extinction ratio of more than 10 dB in C-band, with the Q-factor of more than 47,000. For a chosen polarization, the resonator has an extinction ratio of nearly...
In Location Based Services (LBSs), service providers can obtain mobile users' locations or traces while receiving their service requests. K-anonymity, which is the most commonly used location privacy protection method, needs the cooperation among mobile users to form a k-anonymous group. Though several incentive mechanisms have been proposed to motivate mobile users to participate in the k-anonymous...
In this paper, we present a study on protective coating techniques for thin film X-TEM sample preparation. The study shows that proper choice of the protective layer before FIB cross section is a crucial step to maintain the film profile and make sure the accuracy of the thickness measurement. Silicon native oxide is used as the target sample. We have investigated PECS metal sputtering followed by...
Spectral Clustering is one of pioneered clustering methods in machine learning and pattern recognition field. It relies on the spectral decomposition criterion to learn a low-dimensonal embedding of data for a basic clustering algorithm such as the k-means. The recent sparse Spectral clustering (SSC) introduces the sparsity for the similarity in low-dimensional space by enforcing a sparsity-induced...
The fresh food supply chain faces significant challenges, the food will lose its value rapidly with storage time, and result in the problem of food safety. For the purpose of fresh food safety and maximize fresh food core enterprises profit, this paper describe a network model of safety fresh food supply chain, with quality competition. The model introduce output rate of path p to obtain the number...
Monthly methane concentration (CH4) level over Zoige alpine wetland, China from October of 2002 to December of 2006 was analyzed based on the SCIAMACHY data. The level was low and might decrease from January to March then increase until August (except for 2006), and then decreased until fall or early winter. The linkage of the CH4, air temperature, precipitation, and soil temperature and moisture...
The influence of the azimuth angle and water surface roughness determined by wind speeds on the SAR imaging of a metallic bridge over water was simulated after the identification of the double- and triple-bounced radar returns. Different bounced returns were caused by interactions of the bridge surface and water surface. In the simulation, the radar wavelength was L-band. The azimuth angle was between...
A new four component decomposition algorithm for urban targets delineation from PolSAR imagery was studied. First, a new correlation coefficient was introduced to describe characteristics of urban targets. The coefficient was the linear combination of two elements of a coherent matrix. Then, the coefficient was used to modify the volumetric scattering model component in Yamaguchi et al.'s four-component...
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