分布式电位监测数据采集系统的实现

为了测量大地激励信号所产生的微弱信号,设计了一种分布式电位监测数据采集系统。系统由上位机(接收机)、下位机(采集盒)、总线、供电线和发射机组成。下位机主要由电源模块、控制模块、D/A补偿模块、A/D转换模块和CAN通信模块5部分组成。上位机由VB进行编程,负责指令的发送、数据的接收、存储与显示,可以方便地查看测试结果。经实验验证,该仪器系统稳定可靠、实时性好,对微弱信号测量准确,测量精度可达0.005 mV,将在煤层气和油气田勘探领域发挥重要作用。

一种高精度水力压裂电位监测系统的设计

水力压裂技术起源于石油和天然气的增产,现已发展成为页岩气开采过程中一种有效的方法。设计了一种高精度电位监测系统,对页岩气开采水力压裂过程中地表电位的变化进行动态监测。该系统由24位ADC LTC2400与内嵌CAN控制器的主控芯片STM32F105构成高精度数据采集单元,并用16位DAC进行自然电位补偿,实现了对压裂电位的高精度采集和可靠传输。系统设计完成后进行了多项室内测试及室外测试。测试结果表明,系统实现了高精度、小型化、低功耗设计和便携式应用。

Network Reconfiguration for Load Balancing in Distribution System with Distributed Generation and Capacitor Placement

This paper presents an efficient algorithm for optimization of radial distribution systems by a network reconfiguration to balance feeder loads and eliminate overload conditions. The system load-balancing index is used to determine the loading conditions of the system and maximum system loading capacity. The index value has to be minimum in the optimal network reconfiguration of load balancing. The tabu search algorithm is employed to search for the optimal network reconfiguration. The basic idea behind the search is a move from a current solution to its neighborhood by effectively utilizing a memory to provide an efficient search for optimality. It presents low computational effort and is able to find good quality configurations. Simulation results for a radial 69-bus system. The study results show that the optimal on/off patterns of the switches can be identified to give the best network reconfiguration involving balancing of feeder loads while respecting all the constraints.