Advanced Materials Research Vols. 756-759

Abstract: A basic circuit bridge theory is used to determine a voltage ratio of the transformer winding, which can measure DC resistance, and determine or analysis of serveral fault cases in the power line and cable.

Abstract: The electronic power system can be viewed as a system composed of a set of concurrently interacting subsystems to generate, transmit, and distribute electric power. The complex interaction among sub-systems makes the design of electronic power system complicated. Furthermore, in order to guarantee the safe generation and distribution of electronic power, the fault tolerant mechanisms are incorporated in the system design to satisfy high reliability requirements. As a result, the incorporation makes the design of such system more complicated. We propose a dependable electronic power system architecture, which can provide a generic framework to guide the development of electronic power system to ease the development complexity. In order to provide common idioms and patterns to the system designers, we formally model the electronic power system architecture by using the PVS formal language. Based on the PVS model of this system architecture, we formally verify the fault tolerant properties of the system architecture by using the PVS theorem prover, which can guarantee that the system architecture can satisfy high reliability requirements.

Abstract: In this paper, in order to improve the precision of the short-term load forecasting, we propose a power load forecasting method combined principal component analysis (PCA) with least squares support vector machine (LS-SVM). Firstly PCA extracts the feature of the influence factors for power load, and then LS-SVM constructs a training model with a new variables extracted by PCA. After using PCA-LS-SVM model this paper proposed to forecast power load of one area, the results show that this method can effectively eliminate the redundant information among influential factors, reduce the input dimension of the prediction model, simplify the structure of the network, increase the learning speed and improve the power load forecasting accuracy. So this method is effectively feasible.

Abstract: This paper describes the design and implementation of signaling routines for multi-process micro-kernel embedded operating system on ARM in details, including overview of signaling, architecture of the signaling routines, installation of signal, setting and execution of the signaling handlers. Some essential signaling functions are implemented and commonly used signals are supported, e.g. SIGALRM, SIGINT and SIGCHLD, etc. Signal registration function, signal (), is also designed to set the handler of a signal. On the premise of supporting essential signals, the routines are designed as simple as possible in order to reduce the amount of codes as well as increase the readability. The paper at finally gives a demo example to show the effect of the signaling routines.

Abstract: A high performance power supply system was designed to meet the 1.5V power management, and it also provided 40A current for the load of four FPGA.The output power was 60W, the surface mount can effectively improve the efficiency, reduce the heat loss. In addition to providing power performance accurately, but also can improve the heat dissipation performance.

Abstract: This paper describes the design and implementation of SD card driver and tiny file system for multi-process micro-kernel embedded operating system on ARM in technical details, including structure of device driver, key techniques of designing SD card driver, architecture of the tiny file system, a brief description of its designing and a demo example. The SD card driver and tiny FS are implemented with GNU tool chain by the author of this paper. Practice proves that the system can be used for not only embedded application developments but also related curriculum teaching.

Abstract: This paper briefly describes the principle and procedure of the synchronized operation of the breaker. The cause of the unavailability of manual operation of the bus-tie breaker at a 220 kV substation is identified and a solution is found. The onsite test results show that the proposed solution is effective which enhances the stability of the power grid.

Abstract: On the basis of the craft manufacturing and designing about micro fluidic gyroscope, according to analyze the craft information and studying on the process simulation technology about the MEMS thermal components. Established a basic model of t the craft structure about the MEMS thermal components, based on this model, the L-Edit editor to edit creating a complete mask layout structure; studying a simulation method of craft process, the use of the technological editor which development based on the TCL/TK language to draw out the craft process document, then reconstructed the layout structure based the craft process in a 3D platform. It could be used to detect the rationality of the process program technology.

Abstract: Based on the linearity of the MEMS thermal element fluidic gyroscope compensation. By analyzing the results of the linear characteristic of the fluidic gyroscope sensor output, comparator linearity compensation two implementation methods, the introduction of the microcontroller and the temperature sensor, to achieve the linearity compensation of the gyro output signal. The experiments show that: after compensation, the non-linearity of the fluidic gyroscope5%down to 0.5%, to-120°/s~+120°/s measurement range from-40°/s~+40°/s Fluidic gyroscope linearity compensation with low non-linearity, wide measuring range.

Abstract: This paper had studied on the zero temperature compensation of fluidic gyroscope based on MEMS thermistor. Through the analysis of temperature characteristics of jet gyro sensitive element, two methods of comparison of zero temperature compensation was compared. Then, introduction of SCM and temperature sensor, to achieve zero temperature compensation for gyro output signal. The experiment shows: after compensation, zero voltage variation gyro reduced from 150mV to 10mV, working temperature range from room temperature to-40°C ~+55 °C. The fluidic gyroscope zero temperature compensated with zero drift is low, wide working temperature range advantages.