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Neutral point potential oscillation at low frequency is an important issue in four pole neutral point clamped converter since this leads to the extra voltage stress on the split DC-link capacitors. The detailed analysis indicates such oscillation is closely associated with the neutral point current at low frequency, so this paper explores their relationship, and presents the modulation techniques...
This paper presents a third order coupled bandpass filter using integrated passive device technology and SIR architecture. The filter is based on the semiconductor wafer IPD process, using thin film technique and photolithography technology, combined with the advantages of high harmonic suppression of the SIR. Compared with passive device process such as LTCC (low temperature co-fired ceramic), this...
This paper presents a third order coupled bandpass filter using integrated passive device technology and SIR architecture. The filter is based on the semiconductor wafer IPD process, using thin film technique and photolithography technology, possessing the advantages of high harmonic suppression. Compared with passive device process such as LTCC (low temperature co-fired ceramic), this filter has...
In this paper, a compact third-order bandpass filter with Chebyshev characteristic is designed by using integrated passive device (IPD) technology. The filter is capacitively coupled and consists of three parallel resonators. The simulation results show that the center of the filter Frequency of 1700MHz, bandwidth of 500MHz, the volume is only 1.0mm*0.5mm*0.3mm.
A system based on the Mach-Zehnder low-coherence interferometer for simultaneously measurement in the field of temperature and strain is presented. This system utilizes the principle of the optical path difference modulation and the coherence length modulation in the low coherence interferometer. After frequently testing the interference signal influenced by the temperature and the strain, the sensitivity...
In this work, we propose and demonstrate an optical fiber sensing system consists of fiber sensors made by selectively infiltrated dual-core photonic crystal fiber and demodulation system based on low coherence interferometry. The sensor used in the system is made by selectively filling about 1/3 area of air holes at the cladding of photonic crystal fiber with deionized water. So the two cores of...
The paper addresses the problem of distributed sensor fusion in the framework of random finite set. The Generalized Covariance Intersection (GCI) rule of multi-target densities is extensively used in multi-target Bayesian filtering scheme. But there are two problems in GCI which are unreasonable design of fusion weight and unable to tackle informative differentiation. In order to get rid of the bad...
This paper studies the problem of output feedback stabilization for a class of stochastic nonlinear systems with the unknown output function. For stochastic nonlinear systems, the maximal open sector Δ of output function is given. As long as output function belongs to any closed sector included in Δ, by constructing a reduced-order observer and C2 Lyapunov function and using the homogeneous domination...
This paper investigates the effect of neutral point potential oscillation on four pole neutral point clamped converter. The detailed derivation indicates such oscillation is closely associated with neutral point current, so this paper presents a modulation technique to effectively eliminate this neutral point current. Besides, an offset injected method is also taken into consideration, and a comparison...
The paper addresses the multi-target tracking problem in the framework of asynchronous radars system. Based on probability hypothesis density (PHD) filter, we propose two fusion methods. The first one transfers information between different radar nodes, named as Sequence Process PHD (SP-PHD) fusion, it combines the prediction and update steps of a PHD filter, time alignment and recursive state estimation...
This paper investigates the effectiveness of virtual synchronous machine based on three-phase voltage source converter. The virtual machine can effectively slow down frequency dynamics in micro-grid, which is achieved by emulating the damping and inertia of synchronous machine. Besides, the theoretical analysis indicates the virtual synchronous machine is closely related to the conventional droop...
On social media platforms, companies, organizations and individuals are using the function of sharing or retweeting information to promote their products, policies, and ideas. While a growing body of research has focused on identifying the promoters from millions of users, the promoters themselves are seeking to know what strategies can improve promotional effectiveness, which is rarely studied in...
Heterogeneous events, which are defined as events connecting strongly-typed objects, are ubiquitous in the real world. We propose a HyperEdge-Based Embedding (Hebe) framework for heterogeneous event data, where a hyperedge represents the interaction among a set of involving objects in an event. The Hebe framework models the proximity among objects in an event by predicting a target object given the...
For the characteristics of fault current out from VSC (Voltage Source Converter) power source is very different from that of traditional electrical machine, the existing relay protection technology is not suitable for the micro grid (MG), especially for an isolated MG. A method of relay protection for an isolated MG is proposed, where VSC power source will output variable frequency current during...
Fiber optical sensors based on low-coherence interferometerer have been widely researched in recent years since its high precision and wide measuring range. For commercial application, we demonstrated such a system which consists of two low-coherence interferometer and a data acquisition card for measurement in the field of temperature and strain. By testing the interference signal influenced by temperature...
Three-level neutral-point-clamped (NPC) converters/inverters have become a popular topology for not only medium-voltage (1k–33k) but also low-voltage level industrial application because of its reduced transistor block voltage and lower output current distortion. The neutral point voltage balancing control is one of the important issues of NPC converter to ensure system operation since the voltage...
This paper investigates different compensation methods for neutral point potential deviation based on modular multilevel single star neutral point clamped bridge converter. Theoretical analysis indicates injecting an offset for a cell can effectively decrease this deviation, so this research presents different offset-based compensation techniques, and evaluates their output performance. Besides, this...
Common mode voltage output is closely associated with switching states in three-phase three-wire neutral-point clamped inverter. Detailed analysis shows avoiding redundant states can effectively improve the common mode voltage, so this paper proposes a pulse width modulation (PWM) technique with zero redundant states to reduce the common mode voltage output, and evaluate their performance with the...
Nowadays the weak signal detection technology is necessary in scientific research field, in which the phase-locked amplifying technology is widely used in the field of weak signal detection because it can meet the requirements of high speed and high accuracy. System Generator software is adopted as a tool since System Generator can make the design more conveniently and efficiently. The design of each...
Data transmission through satellite networks provides ubiquitous communication all over the world. But the time-variant topologies lead to lossy inter-satellite links and long end-to-end delay. To address these problems, in this paper we propose a novel satellite network management method and routing algorithm. The former specializes satellites in different layers to utilize network resources efficiently,...
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