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This paper proposes a improved hill climbing searching (HCS) maximum power point tracking (MPPT) control strategy for the dual power flow (DPF) wind energy conversion system (WECS) which is based on the electrical variable transmission (EVT). The proposed improved HCS MPPT strategy is developed based on the electrical power which is generated by the stator. The peak detection capability has been devised...
This paper proposes an output power smoothing control strategy for the wind farm without any other energy storage devices (ESS), which is based on the allocation and control of the wind turbines (WT). The wind turbines in the wind farm are divided into control wind turbines (CWT) and power wind turbines (PWT) separately while playing different roles. The PWTs are expected to output as much power as...
Flood loss prediction is very important in China. In this paper, flood factors of coastal city, such as geological sedimentation rate, rise in sea level height, precipitation, urban drainage pipe length, annual GDP and population throughout the year will be considered to predict flood loss. Firstly, AHP will be used to determine the weight of flood factors. Considering the characteristics of different...
Micro blogging is fast becoming a dominant medium in social media and its impact is evident in our daily lives. A massive amount of information is produced on a daily basis. It is observed that detecting hot topics can be very helpful for people to get essential information quickly. But due to short and sparse features, high flood of meaningless tweets and other characteristics of micro blogs, traditional...
Compared with conventional laboratory chemical analysis, ion selective electrode (ISE) is time-saving, low-cost, ease of use and pollution-free. To detect soil nitrate nitrogen content rapidly, a nitrate ion selective electrode could be used. This paper studied characteristics of nitrate ISE. Potentiometric experiments utilizing nitrate ISE to measure sodium nitrate solution were conducted during...
In the agricultural production, recently there are some problems in the determination of the amount of soil nitrate nitrogen using ion selective electrode such as low accuracy and long detection time. The research on measurement model of soil nitrate nitrogen based on ion selective electrode is carried out in this article aiming to obtain the information of soil nitrate nitrogen quickly and accurately...
Social networks have been evolving over the past few years, leading to a rapid increase in the number and complexity of relationships among their entities. In this paper, we focus on a large scale dataset known as the Digital Bibliography and Library Project (DBLP), which contains information on all publications that have been published in computer and information science related journals and conference...
This paper proposes a sensorless maximum power point tracking (MPPT) strategy for dual power flow wind energy conversion system (WECS) based on electrical variable transmission (EVT). The outer rotor torque of the EVT is suitably controlled according to the outer rotor speed to realize the MPPT without the knowledge of wind velocity. Moreover, the model reference adaptive system (MRAS) observers are...
Supplier quality determines the quality of products offered, and how to quickly and effectively select high-quality suppliers is one of the core issues facing enterprise. From the perspective of the supply chain, this article proposes the theoretical model of the supplier evaluation and selection, establishes a index system of comprehensive evaluation, and applies Analytic Hierarchical Process??iAHP??j...
This paper presents a dual-mode power control strategy for a dual power flow (DPF) wind power generation system (WPGS). When the wind power is below the rated value, two maximum power point tracking (MPPT) methods, namely speed feedback control and torque feedback control, are adopted and compared. On the other hand, when the wind power is above the rated value, the power control would be taken and...
Urban eco-transportation system is the development direction of urban transportation system; urban traffic mode structure is an all-important factor that affects the realization of it. Despite a voluminous empirical research of traffic mode structure, most of them have failed to adequately consider the ecology problem. On the basis of satisfying all requirements of eco-transportation system, and according...
In this paper, based on a dual mechanical port machine (DMPM), a novel dual power flow wind power generation system (DPF-WPGS) is proposed and analyzed. The operation principle of DPF-WPGS and the dynamic model of DMPM are introduced. The control strategies are analyzed and simulated in Matlab/Simulink. To evaluate the performance of DMPM-based WPGS, two other conventional WPGSs, namely, the direct-drive...
A new constant-frequency double-rotor (CFDR) generator for the wind power generation is proposed in this paper. The CFDR generator needs only part-size power converter which is the same as that of the doubly-fed induction generator. As permanent magnets are mounted on the outer rotor of the CFDR generator, high performances may be achieved. In this paper, the structure of the double-rotor generator...
In this paper, a review focused on the control theory of induction machines (IM) is presented. Then, the influences of dead time and voltage drop of switching devices are discussed. Consequently, considering both effects of dead time and voltage drop, an improved stator flux observation strategy for the direct torque controlled (DTC) EVI drive system is proposed. A simulation model is developed and...
In order to improve the practicality and accuracy of simulation on vehicle traction performance, the simulation models of tire on vehicle traction performance are built by using three-dimensional finite element analysis, and on this basis the traction performance characteristics on entire vehicle are discussed. Aiming at a four-wheel-drive vehicle, the mathematical models about the accelerated process...
Rough set theory and the fuzzy inference technique are integrated into the multi-factor medium and long-term hydrological classified forecast to solve the difficult problem of factors' choice. The attribute reduction algorithm is used to choose the essential forecast factor sets whose classification capabilities are the best. Other forecast factor sets meeting the forecast requirement are looked after...
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