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The traditional metering device has some problems in system reliability, electricity-stealing prevention and accuracy. In order to solve the above problems, a new type of three-phase high-voltage energy meter based on RN8302 is designed in this paper. In order to collect voltage signal, we design voltage divider circuit. It uses low-power current sensor to collect current signals. The whole measurement...
The structure and working principle of hybrid energy storage system are introduced. The classical RC model of ultracapacitor is analyzed, and the topology of charging and discharging converter of energy storage system is studied. A ultracapacitor-battery hybrid energy storage system model based on bidirectional boost-buck circuit is constructed, and the charging and discharging process of the energy...
Supercapacitor, as a new type of energy storage device, has broad application prospect in the power system and others. It is very significant to establish an accurate model to reflect the actual job characteristics for supercapacitor reasonable use, performance optimization and system simulation. This article summarizes all kinds of supercapacitor model, points out the characteristics of the existing...
The highest probability of power quality problems is the voltage sag in the power system. Dynamic Voltage Restorer (The following is abbreviated as DVR) is the main method to solve dynamic power quality problems. To obtain better dynamic performance, simple control effect and strong robustness, we propose a dynamic tuning method for the PID control parameters of dynamic voltage restorer using RBF...
As for permanent magnet synchronous motor, permanent magnet flux is constant, this article analyzes the d-q axis PMSM model, applies voltage space vector pulse width modulation technology (SVPWM) control method. Combining with the fuzzy PID control principle, fuzzy PID control strategy of permanent magnet synchronous motor is studied. This paper discusses the method of establishing SVPWM control system...
Supercapacitor is a new type of energy storage element, and its performance is easily influenced by temperature. In order to have more precise energy storage characteristic research of supercapacitor, a modified porous circuit equivalent model is proposed on the basis of porous circuit equivalent model in electric double layer supercapacitor. The simulation results show that modified porous circuit...
The technology of virtual reality has been widely used in various fields and it's been playing an important role in recent years. It possesses characteristics such as high immersion, dynamic interactivity and digitization of multidimensional information, etc, which are exactly the needs for the combination of modern sports development and technology advancement. Along with the recognition and investment...
Landsat TM/ETM+ data in May or June are used to depict the land use changes from 1988,1994, 2001, 2003, 2005, 2006 respectively inner Beijing six ring express road and specially to watch the land use changes from the beginning of Beijing Olympic playground area housebreaking in 2002. The great changes are identified in terms of land use change and usage replacements.
P2DHMM is widely applied in face variation and handwriting domains, which may be a good model for object variation detection in remote sensing image. This paper introduces our efforts to build the technique procedures for the use of P2DHMM in airplane variation detection.
Temporal independent pulse-coupled neuron network (TI-PCNN) has been developed and shows its usefulness on digital image segmentation. However, Due to its heavy computational cost and over-segmentation of objects within the range of low intensity, the original TI-PCNN method is ineffective at segmenting High Spatial Resolution remotely sensed Images (HSRI). By taking into account of spatial and spectral...
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