Applied Mechanics and Materials Vols. 380-384

Abstract: Smart grid is a very important trend of power system. With the sharing of smart grid and micro-grid from the traditional power grid, the energy cost and the environmental degradation of power grid have reduced. This paper introduces a dynamic demand response and distributed generation management approach according to micro-smart grid of a residential area. This method has dynamic update mechanism, demand response automation operation and human intervention. Distributed management coordinates with demand response. For example, random load and wind power generation are used to reduce the cost of energy consumption of a residential area. This paper achieves the study of the demand of dynamic housing and the application of distributed generation management in micro-smart grid by the form of distributed generation management modeling. It introduces the specific distribution form of the distributed micro-smart grid taking the building of new rural micro smart grid for example. It also introduces the circuit schematic diagram of micro smart grid.

Abstract: For the nonlinearity of sensors always reduces the accuracy of control and detection system in engineering, a new compensation method based on MCU is put forward in this paper. To verify the feasibility of this method, a data acquisition system and compensation system are designed. The polynomial fitting is applied to obtain the functional relationship between input and output. Then the compensation system is tested on the resistive displacement sensor. The results show that after the compensation, the sensor error can be reduced to less than 1% and this method is identified to be practical.

Abstract: A closing electromagnetic mechanism for rail transit direct-current circuit breaker is designed. But it is found that the temperature is too high when the mechanism kept closing for a long time because of the coils high power. Based on the theory of electromagnetic field and electromagnet design, the distribution of magnetic field and the electromagnetic force of electromagnetic mechanism are simulated by finite element analysis software ANSYS. An improved mechanism is manufactured according to the simulation results. The experiments show that the improved scheme can effectively reduce the electromagnetic mechanisms closing maintenance power, and the accuracy of simulation results is validated.

Abstract: The implementation based on DSP (Digital Signal Processor) plays an important role in the LTE protocol development. Firstly, this paper introduces the generation process and mapping location of time-frequency of cell-specific reference signals and chooses LS algorithm to carry on the channel estimation after weighed the DSP implementation complexity and algorithm performance. Secondly, describes the design and implementation of the channel estimation key modules in the perspective of memory allocation, operation cycles and competition accuracy. Finally, the performance analysis and BER results show that the proposed scheme can not only meet the requirements of real-time processing but also provide superior performance.

Abstract: Based on security constraint economic dispatch module, and with wind power prior utilization as target, the day-ahead optimum dispatching model of wind-thermal power is constructed to improve the acceptance ability of intermittent new energy generation. The practical application in Jibei power grid indicates that this model can meet the compiling requirements of day-ahead generation schedule, realizes the prior acceptance of wind power and contributes to the energy saving and emissions reduction in power field under the power grid security constraint.

Abstract: To remove or reduce the cladding layer thickness of fiber Bragg grating, the refractive index changes in the surrounding environment will affect the fiber Bragg grating effective refractive index of the core, resulting in changes in the Bragg wavelength. Solution concentration changes will cause changes in refractive index of the solution. A new kind of solution concentration sensor is designed with the etched phase shifted fiber Bragg grating, and concentration sensing detection with four kinds of solutions is experimentally demonstrated. With resolution concentration increasing, the phase shifted label wavelength shifts to the red, and the sensor is more sensitive in the case of higher concentration.

Abstract: This paper, based on several aspects of hot technology such as embedded system, Zigbee technology, and wi-fi wireless broadband technology, designed and implemented an ARM-based embedded Zigbee wireless gateway, which is used to complete the conversion of Zigbee protocol and wi-fi protocol, in order to realize the connectivity of Zigbee network and Internet.

Abstract: Antifuse FPGA because for its low power consumption, high reliability, high security, etc., are widely used in space electronic systems. However, antifuse FPGA running in the space environment is also vulnerable to space radiation. This paper analyzes the single event effects in antifuse FPGA in detail and put forward the TMR and EDAC anti-SEE hardening design and implementation methods. The ground heavy ions accelerated test is conducted to verify the design of hardening; test results and analysis show that the hardening design method can effectively improve the COTS antifuse FPGA for space applications reliability.

Abstract: The paper analyzes reactive power optimization of regional power grid, and it establishes the mathematical model of power system reactive power optimization, taking minimizing annual operating cost as an object function, at the same time, considering the power factors and constraints of load bus voltage amplitude. It uses the MATLAB optimization toolbox quadratic function to optimize compute, and applies it to the reactive power optimization in actual regional power grid. Results show that the proposed mathematical model and algorithm are effective and practical.

Abstract: Wireless laser pointer is widely used in multimedia teaching. Due to the usage of professional high speed USB interface chips and USB2.0 protocol, the price of a wireless laser pointer in the market with the only function of changing PPT pages is about 50 dollar.This paper completes a very low price design of wireless laser pointer for multimedia teaching use based on STC89C52RC MCU and nRF905 single-chip radio transceivers,which can complete not only PPT page turning forward or backward but also black screen, drawing lines with fluorescent pen or needlepoint.