Applied Mechanics and Materials Vols. 687-691

Abstract: VSC-HVDC is usually associated with the AC system, which will be inevitably affected by AC system.VSC-HVDC mostly operates in the environment of strong current and high voltage, which will lead some parts of internal device to be interfered or damaged.This paper studies the control technology of VSC-HVDC in AC system fault mode to ensure that the device itself is not only perfect but timely rescue the AC system when it is necessary.

Abstract: This paper expounds the control principle of active disturbance rejection controller (ADRC). The traditional flexible HVDC transmission system has a lot of disturbance factors and uncertainty,so Particle Swarm Optimization ( PSO ) algorithm is proposed to optimize the theory of ADRC which is used to design out-loop control system of flexible HVDC.The simulation results prove that control performance of system has been effectively improved .

Abstract: The key issue for the oil filter product sand operating status of the transformer oil filter, and in-depth research, based on the research and development of the transformer oil filtering device charged. Charged transformer oil filtering device structure includes an external oil circulation system, internal purification systems and automatic control and protection system of three parts. The device has also explained the conventional oil filter and oil filter charged two modes, when conventional oil filter modes election, workflow is identical with ordinary oil filter; If you choose to live oil filtering mode, you need to set the control variable range and start monitoring and adjustment, transformer oil filtering method has been put live field application, its efficiency and reliability of the actual verification.

Abstract: This paper reviewed techniques of vibration sensors, studied structure and working principle of phase modulated optical fiber vibration sensor, and designed a new structure of non-contact optical vibration sensor. Use this structure, expect accuracy of 0.1um can be obtained in the range of 1mm. At the same time, this system is simple, anti-interference ability, high reliability and ease of practical.

Abstract: The digital frequency meter was a device to detect and display the frequency. In many design complexity, features a variety of electronic devices, the digital frequency meter was one of the essential equipment. It was widely used in various fields. The core of the frequency meter is AT89C51 microcontroller. It used SCM counting and timing functions to achieve the measurement pulse within a certain gate time, and it uses LED digital display tube displays the measured frequency. The device has a high frequency accuracy measurement, real time, and it has a simple, easy to carry, strong expansion capability, a wide range.

Abstract: In order to discard some disadvantages of traditional astronomical navigation positioning, such as manual computation and time-consuming, we design a special calculator for locating ship's position, which not only make astronomical navigation positioning calculation quickly and operate instrument simply, but also convenient to carry. The system based on the theory of sun shift line positioning principle use the 32-bit microcontrollers based on ARM Cortex-M3 kernel as the core controller. In this paper, we give hardware design and software process of the system. Through actual test, the results of the testing value and actual value can tally well. Its calculation process only needs a few seconds, also could greatly improve the real-time and accuracy of positioning.

Abstract: With the development of photovoltaic technology with the electronic technology, solar car as a new energy vehicles has emerged. By comparison with conventional fuel vehicles, analyzes the advantages and shortcomings of the solar car, solar car elaborated while the current state of development, in considering the factors limiting the development of solar car, based on the prospects for the development of solar cars analyzed, providing a reference for the future direction of the solar car.

Abstract: This paper focused on several practical applications of SVG technique in new era. First, the present study made a basic introduction on reactive compensation from three aspects. Second, it briefly analyzed the features of the load of SVG which remained to be solved in different fields from five aspects. Third, this study made an integrated analysis of the devices and technology parameters of SVG from two aspects. It was expected to be able to provide some useful inspirations and help to the experts and scholars.

Abstract: A scheme based on 32-bits S3C2440 of ARM920T and Linux OS for network video surveillance system is proposed. The video signals are collected by a USB camera and are coded by H264. The data are then transported to the network by a standard Ethernet port and are displayed by a WEB server. The network camera has an independent IP. Remote users could dispatch and browse the whole network resources to achieve real-time monitoring with their PC standard web browser.

Abstract: A high-performance bandgap reference voltage source design method is proposed in this paper, according to the shortcomings of traditional bandgap reference voltage source. This method combined CSMC 0.35μm CMOS process with Aether software technology, enabling to improve the bandgap reference source op amp performance and take into account accuracy and stability of the system. From the experimental results: this bandgap reference voltage source output voltage has changed about 63 mV when the temperature varied from to , and the line regulator is 0.4mV/V when the power supply voltage varied from 3.2V to 3.3V. This system has advantages of high accuracy and good stability.