Advanced Materials Research Vols. 1049-1050

Abstract: This paper analysis the low power load forecasting accuracy in summer deep. It found the factors affecting accuracy rate of power load forecasting in summer, and proposed the measures to increase the load forecasting accuracy.

Abstract: This paper presented a research on zero mode current traveling wave based distribution line fault location method which is not affected by wave velocity. The mathematical expressions of initial distribution line fault current traveling wave, reflection wave of the fault location and the refraction wave of opposite ends are derived. And the directivity relationship and identification method of these three element are fully analyzed. Based on the research process mentioned above, the fault location method introduced in this paper eliminates the error produced both by velocity propagation and clock synchronization. In this way, the veracity and reliability of short distribution line fault location was improved.

Abstract: 1000MW thermal power the first one million kilowatts unit project, in central China. It is also China's first with "big pressure on the small" approach approved one million kilowatts unit project, its safe operation of boilers has important significance. This article describes the FSSS boiler protection system debugging, application of 2*1000MW units Unit 1, from system debugging, maintenance, use, etc. It should be noted that some of the issues rose for the technical officers.

Abstract: Based on analyzing the mathematical model of Brushless DC Motor (BLDCM) and the key researching on electric process state spaces of BLDCM main module, taking its one state space as an example, BLDCM system is proposed as a new method of simulation model. This method establish BLDCM dynamic mathematical model, and the simulation is made to verify the theoretical model. Experimental results demonstrate the new method is successfully applied to the design of the electric vehicle drive system simulation.

Abstract: Theoretical analysis and practice experience have shown that, the vibration signal on power transformer surface can be used to analyze and judge the work state of the winding and iron core. For vibration analysis, to extract a precise feature of the vibration signal is a basic work. Based on wavelet multiresolution analysis, three-dimensional surface vibration signal of the running power transformer is analyzed. Based on the Parseval theorem, the feature of frequency bands-energy in X, Y, Z directions is computed and compared. It provides some reference for the power transformer vibration analysis.

Abstract: STM32F103 microprocessor as the core, this paper introduces the research design scheme of power acquisition in the smart grid. This design can realize real-time acquisition and analysis of power, has the characteristics of high precision and little error. The power acquisition design program is also used in the chip ATT7022, simplify the design of the circuit. Chip ATT7022 collected can be voltage, current reactive power and power factor and other parameters were calculated. The microprocessor STM32F103 mainly analyze the calculation of the data. If the data is not correct, the microprocessor STM32F103 then control circuit is revised accordingly. Practice shows that the intelligent power acquisition system meet the requirements of the smart grid.

Abstract: Digital band-pass filters play a very important role in instrument design. For some special applications, such as corrosion inspection of buried oil or gas pipeline, more than one band-pass filter with different center frequencies are needed to process different frequency signals. FPGA (Field-Programmable Gate Array) are widely used in these applications because of its high compute velocity and flexibility. For low cost and high reliability purposes, it is expected that one digital filter with a fixed configuration parameters can serve as multi different center frequency digital filter. In this paper a design method is proposed to realize two different center frequency band-pass filters which have the same filtering effect. Through analysis of design process for FIR band-pass filter, it’s easy to find that if the ratios (filter’ sample rate of input data to its cut-off frequency) of two filters keep equal, the normalized frequency will also equal. Thus according to this, two band-pass filters can have the same coefficients only if they have the same ratio of sample rate to cut-off frequency. This relationship is discussed here and MATLAB experiment is used to prove its effectiveness. This method is already used to design filters in pipeline current mapper instrument to inspect pipeline corrosion.

Abstract: Vehicle braking system in vehicle security plays an important role.In recent years, with the progress of vehicle technology and improvement of the car speed, the rapid development of electronic technology provides a more broad space of development to the braking system. Based on the use of electronic technology in automobile braking system present situation as the research object, the application of electronic technology in automobile braking system has carried on the detailed exploration and research, to promote the further study of electronic technology in automobile braking system and the application.

Abstract: A kind of CMOS bandgap reference circuit with high order temperature compensation is introduced [1]. Compared to the traditional circuit, the bandgap reference proposed here has several advantages such as better temperature stability, smaller chip area, lower power consumption, self-power-on, and so on. Our design can be used in analog-to-digital or digital-to-analog converters, where high performance bandgap reference is required.

Abstract: A digital CMOS output interface circuit is proposed, which lowers down the peak and lengthen the duration of the pulse of current supplied by the power supply to reduce the SSN (simultaneously-switching noise) effects. The simulation shows that the maximal SSN voltage of the proposed circuit is 331.5mV compared to 662.4mV of the traditional one.