A5100455563- Chaos control and synchronization
- Microgrid Control and Optimization
- Advanced DC-DC Converters
- Climate change and permafrost
- Nonlinear Dynamics and Pattern Formation
- stochastic dynamics and bifurcation
- Multilevel Inverters and Converters
- Cryospheric studies and observations
- Radar Systems and Signal Processing
- Quantum chaos and dynamical systems
- HIV, Drug Use, Sexual Risk
- Adolescent Sexual and Reproductive Health
- HIV/AIDS Research and Interventions
- Arctic and Antarctic ice dynamics
- Advanced Differential Equations and Dynamical Systems
- Insect Pest Control Strategies
- Photosynthetic Processes and Mechanisms
- High-pressure geophysics and materials
- Wind Turbine Control Systems
- Plant Genetic and Mutation Studies
- Radio Wave Propagation Studies
- Quantum Chromodynamics and Particle Interactions
- Low-power high-performance VLSI design
- Nematode management and characterization studies
- Distributed Control Multi-Agent Systems
Northwest Institute of Eco-Environment and Resources
2022-2023
Chinese Academy of Sciences
2022-2023
Chongqing University of Science and Technology
2016-2023
Heilongjiang University of Chinese Medicine
2022-2023
University of Chinese Academy of Sciences
2022
Geological Exploration Institute of Shandong Zhengyuan
2022
Xi'an Jiaotong University
2019
Shanghai Electric (China)
2017
Shanghai University
2014
China Academy of Space Technology
2010
It has been confirmed that a larger stability domain more advantages for system operation. In this paper, novel one-cycle control (OCC) embedded with composite function is proposed. Its principle based on maintaining the symmetry of volt-second value inductor in each cycle. Then, selecting reference voltage as study variable, boundaries and identify stable parameter domains are studied by establishing state-space average model. The results demonstrate that, compared conventional OCC,...
This paper presents a CCM-DCM average current control (CDAC) method for effectively controlling boost power factor correctors (PFCs). It is capable of operating in both the continuous conduction mode (CCM), mixed (MCM) and discontinuous (DCM). By estimating value inductor each switching cycle, CDAC efficiency improvements harmonic distortion reductions PFCs over wide load range, especially DCM mode. Besides, it mathematically computationally simple. Compared with conventional method,...
One-cycle controlled Cuk converters are prone to exhibit oscillation at the input stage as a result of Hopf bifurcation. A controller based on time delay feedback is proposed eliminate and stabilize converter. The introduces two new parameters, which known gain delayed time. These parameters great importance in stabilizing averaged model converter adopted select parameters. necessary condition for be stabilized gives an effective range An experimental was constructed verification purposes....
Boost converters with one cycle control (OCC) are prone to exhibit oscillations as the Hopf bifurcation, which may degrade performances and limit parameter stable region of converters. This work proposed a novel strategy for suppressing such bifurcations enlarging stability boost system on basis principle energy balance in circuit. Through analyzing bifurcation condition, results reflect that, energybased OCC can adjust poles transfer function, ensures operation an extended range circuit...
A first-order-filter-based time delay feedback (TDF) controller is proposed to stabilize the buck converter when operating with non-linear phenomena, such as bifurcation and chaos. Compared existing second-order filter method, needs only two parameters. This similar ideal TDF it makes design of simpler. The discrete model used compute one parameters, which known gain. frequency domain comparison shows that almost non-invasive, because does not change dc component changes slightly harmonic at...
Generated by an ordinary Colpitts oscillator, chaotic waveforms with bandwidth larger than several GHz can be readily obtained. A prototype of signal radar oscillator is set up to experimentally investigate the performance in system. The correlation traces between transmitted and reference signals are presented, whose spike point reveals experimental transmission distance. Experimental results show that proposed has advantages high range resolution, rate unambiguous profile, electronic...
The One-Cycle Controlled Boost Power Factor Correction converter has one voltage control loop, which may exhibit instability when the load is light. results in a low Factor. To ensure that high, time delay circuit was adopted this paper to of converter. architecture described, and its transfer function derived. double averaging method applied determine parameters method. Experimental verified power factor increased from 0.82 0.99 after activating circuit.
Power Factor Correction (PFC) converters are widely used in engineering. A classical PFC control circuit employs two complicated feedback loops and a multiplier, while the One-Cycle-Controlled (OCC) converter has simple circuit. In OCC converters, voltage loop is implemented with PID multiplier not needed. Although linear theory designing circuit, it cannot be predicting non-linear phenomena converter. this paper, model of Boost proposed based on double averaging method. The line frequency...
A new Rb–Be rare metal deposit has been discovered in the northern margin of North China Craton Fuxin City, western Liaoning Province, China. The Daxiyingzi is a granitic pegmatite-type and composed mainly biotite granite, albite amazonite pegmatite. Amazonite beryl are main ore minerals containing Rb Be, occur We present integrated 40Ar/39Ar geochronology, mineralogy, whole-rock geochemistry, Nd–Pb isotope analyses ore-bearing granites to better understand their petrogenesis geodynamic...
The Buck converter exhibits interesting nonlinear phenomena which many studies have addressed, and the resonant parametric perturbation is effective to control these phenomena. We investigate mechanism by using monodromy matrix derived from Filippov's method when has an appropriate phase shift duty ratio not changed. find that only one term in changes, as a result of it, eigenvalues may move into unit circle with amplitude much less than existing methods. Along this clue, we make further...
Large penetration of distributed photovoltaic (PV) systems in distribution networks (DNs) helps reduce greenhouse gas emissions. However, the peak generation PV DN may be more than total load demand, and extra power can cause overvoltage issue. To solve this issue, we proposed to take advantage ever-increasing plug-in electric vehicles (PEV) absorb regulate voltage. By using PEVs as energy storage when peaks, excess shaved well voltage controlled within a safe margin. We compared method (by...
As a major parameter in the energy balance of ground surface, temperature represents level exchange and moisture between air. The Qinghai-Tibet Plateau (QTP) has permafrost region with highest altitude largest area low–middle latitude world. variation surface an impact on existence development permafrost. Therefore, analysis QTP is significant to reflect regions. This paper collected solar radiation data calculated conversion coefficient from total long-wave different underlying surfaces....
Using the triaxial shear or compressive strength as a single index of resistance frozen soils to failure does not always meet soil engineering requirements for comprehensive evaluation resistance. In this study, compression experiments were carried out on undisturbed ice-rich clay samples with various levels water content under different confining pressures study characteristics strain energy density samples. The results indicate that pressure increased, first increased and then decreased....
Cascaded multilevel converters are promising candidates for grid-connected PV systems, but low-frequency ripples may exist in a DC link. Such not just inherent; they can occur due to environmental factors, such as variations certain range of irradiance the PV. To address this issue, article proposes clock phase-shifted (CPS) energy balance control method cascaded inverters photovoltaic (PV) systems. The proposed scheme prevent ripple link propagating power grid. Furthermore, it is feasible...
Light quality consists of a spectrum different bands, which not only affects plant, development, and primary metabolism but also the secondary plants. It is an important factor affecting content active components medicinal The A. paniculata seedlings planted in laboratory, as materials, were tested with red light, far blue ultraviolet light separately. study assays six main chemical separately by LC-MS, observes changes content, analyzes relationship between ingredient . Using ointment yield...
Abstract. The thermal state of permafrost in the present and future is fundamental to ecosystem evolution, hydrological process, carbon release, infrastructure integrity cold regions. From 2011, we began establish a monitoring network along China-Russia crude oil pipelines (CRCOPs) route at eastern flank northern Da Xing'anling Mountains Northeast China. Based on meteorological data near southern limit latitudinal (SLLP), ground temperature 20 boreholes with depths 10–60.6 m, soil volumetric...
The paper proposes the algorithm of survival topology evolution model. model applies analysis to research on networks. On one hand, it takes survivability every node into account. Since state a is affected by itself, environment and so on, it's necessary study nodes. In addition, nodes can indicate whether work well in real time. other also deletion links determined Then reaches conclusion mean field method. result shows that degree distributions WSNs are approximately power law as B-A...
Quality service is the lifeblood of a power supply enterprise.It necessary requirement that improving ability and level quality to meet needs economic social electricity establish socialistic harmonious society.It an important content expand market enhance core competence corporation as well.Forewarning occurrence management complaint process gap enterprises inner,and so does customer satisfaction.
According to the flow characteristics of variable liquid fertilizer control system, fuzzy PID method fertilizer, and process is simulated by use MATLAB Simulink Fuzzy tools. The simulation results show that: compared with conventional control, algorithm reduce system overshoot, shorten time adjustment, enhance anti-jamming, amount maintained more effectively in a given range, superiority PID.