Applied Mechanics and Materials Vols. 380-384

Abstract: Typical micro-grid structure is the foundation of energy management, control, protection and stability of the micro-grid. Combination of the characteristics of the ordinary grid structure, with reference to the characteristics and development direction of the current domestic and overseas micro-network structural as well as the geographical features of the remote region, the micro-grid structure of the remote area is divided into single-family structures in extremely sparse populated areas and multi-family structures in remote villages according to the characteristics of its population distribution. And the control procedure of its running is explained. Besides, this paper emphasizes the agent control using in multi-family micro network.

Abstract: G-bios is a type of Bootloader and its code is open source. Bootloader is one of the important parts of the embedded system for its booting and loading operating systems function. The design and implementation of interrupt in Bootloader and the improvement of the systems execution efficiency is the innovative point of this paper.

Abstract: For the burst-type acoustic emission signal, time delay estimation of two sensors calculated by signal cross-correlation is not accurate, and it leads the source localization results is not also accurate. A new method is proposed to improve accuracy of source localization results based on multi-scale analysis and multi-sensors. Acoustic emission signal multi-scale analysis using wavelet transform, then the most accurate time delay is selected in sub-band of signal multi-scale analysis by multi-sensors time delay vector close rule. Finally, the simulation acoustic emission source localization experiment has high accuracy.

Abstract: The impact of PV and Battery storage system on the power supply reliability of distribution network is great. Firstly, the assumptions of the battery storage operating strategy are given, and four typical evaluation indexes are presented. Then, the impacts of different PV peak active power, different battery capacity and PV & Battery Storage on the power supply reliability are discussed. Finally, the impacts of PV, Battery and PV & Battery on the power supply reliability of distribution network are compared and analyzed. These results are provided as references for the optimal capacity configuration of PV & Battery.

Abstract: As one of main clean energies, wind power has been developed fast, but the fluctuations of active power at a wind farm is a huge challenge for the grid system, thus it is essential for wind farm connected into grid to detection the active power. This paper studied control strategies and detection methods of the active power at a wind farm. Simulation results showed the effective detection of active power at a wind farm can improve the characteristics of the grid and the ability of wind farm to regulate the grid and increase the scheduled ability of wind farm.

Abstract: DC transmission brings in pressure on the supporting capacity of voltage of AC system along with its more and more wide application. Under the steady state, the reactive power consumed in the process of commutation in the converter station is equivalent to a half of that for transmission of active power. During the failure and in course of system recovery after removal of failure, there may be more reactive power to be consumed because of the regulation function of controller. A number of studies on the stability of voltage of AC/DC system have been conducted at home and abroad. This paper summarizes the research methods of the stability of voltage of AC&DC hybrid system.

Abstract: Large scale wind power integration has influenced the safety of power system. Taking wind power integration in Jilin as example, the paper describes the influencing factors of large scale wind power integration on reactive power of the grid in detail firstly, then analyze the reactive voltage in four typical ways, and discuss the impact of the wind power fluctuations on the grid reactive voltage.

Abstract: With the fast developing on distributed generations (DGs) integrating into distribution system, it changes power flow direction in tree-topology, as a result of which traditional power flow method is not effective for this new scene. It is necessary to make improvement on traditional method in order to accelerate the speed of power flow calculation. Since fast decoupled method is not suitable for system with a high R/X ratio, its need to make compensation for the branches to increase R/X ratio. DGs are integrated into power gird normally by inverter interfaced mode or direct grid-connected mode. In this paper, a new fast decoupled power flow method is proposed which could solve various DGs integrated into distribution network, as well as loop topology of distribution system. The utility of proposed method is tested by simulations of IEEE 69-bus system.

Abstract: There are many problems for traditional reactive power compensation devices to be applied in the grid, such as discontinuous adjustment, small capacity, complex control and harmonics. This paper aims to study a high temperature superconducting magnetically controlled saturable reactor (HTS MCSR), which has a wide range of stepless adjustment. It has a good application prospect in large scale reactive power compensation devices. Based on research of theory and core structure, a shaped-cylinder core is proposed. By means of calculation of saturable reactor and analysis of algebraic and magnetic circuit model, design of 220V HTS MCSR is finished. Results of normal conductive reactor prototype and simulations verify that the range of inductance adjustment is very wide. Furthermore, conceptual design of 35kV HTS MCSR confirms its reactive power capacity is so large, therefore, it is suitable for high voltage power system.

Abstract: On-chip thermal sensors are employed by dynamic thermal management techniques to measure runtime thermal behavior of microprocessors so as to prevent the on-set of high temperatures. The allocation and the placement of thermal sensors directly impact the effectiveness of the dynamic thermal management mechanisms. In this paper, we propose systematic and effective strategies for determining the optimal locations for temperature sensors based on thermal gradient analysis to provide the trade-off between hot spot estimation and full thermal reconstruction. Experimental results indicate the superiority of our techniques and confirm that our proposed methods are able to create a sensor distribution for a given microprocessor architecture.