A great concern for the modern distribution grid is how well it can withstand and respond to adverse conditions. One way that utilities are addressing this issue is by adding redundancy to their systems. Likewise, dis...A great concern for the modern distribution grid is how well it can withstand and respond to adverse conditions. One way that utilities are addressing this issue is by adding redundancy to their systems. Likewise, distributed generation (DG) is becoming an increasingly popular asset at the distribution level and the idea of microgrids operating as standalone systems apart from the bulk electric grid is quickly becoming a reality. This allows for greater flexibility as systems can now take on exponentially more configurations than the radial, one-way distribution systems of the past. These added capabilities, however, make the system reconfiguration with a much more complex problem causing utilities to question if they are operating their distribution systems optimally. In addition, tools like Supervisory Control and Data Acquisition (SCADA) and Distribution Automation (DA) allow for systems to be reconfigured faster than humans can make decisions on how to reconfigure them. As a result, this paper seeks to develop an automated partitioning scheme for distribution systems that can respond to varying system conditions while ensuring a variety of operational constraints on the final configuration. It uses linear programming and graph theory. Power flow is calculated externally to the LP and a feedback loop is used to recalculate the solution if a violation is found. Application to test systems shows that it can reconfigure systems containing any number of loops resulting in a radial configuration. It can connect multiple sources to a single microgrid if more capacity is needed to supply the microgrid’s load.展开更多
针对高速分布式地震勘探对多节点RS485和以太网互联的需求,该文采用物理层以太网集成芯片DP83848和STM32微控制器,设计一种低成本以太网—RS485网关,并利用"分时切换"和"前后台程序"配合的方法,对RS485及TCP/IP协...针对高速分布式地震勘探对多节点RS485和以太网互联的需求,该文采用物理层以太网集成芯片DP83848和STM32微控制器,设计一种低成本以太网—RS485网关,并利用"分时切换"和"前后台程序"配合的方法,对RS485及TCP/IP协议栈进行优化,以便提高运行效率。测试表明:该网关可实现2 M RS485网络和100 M以太网互联,当采集节点为24位1 kb/s采样率的数字检波器时,单网关可连接地震通道数超过100道。展开更多
文摘A great concern for the modern distribution grid is how well it can withstand and respond to adverse conditions. One way that utilities are addressing this issue is by adding redundancy to their systems. Likewise, distributed generation (DG) is becoming an increasingly popular asset at the distribution level and the idea of microgrids operating as standalone systems apart from the bulk electric grid is quickly becoming a reality. This allows for greater flexibility as systems can now take on exponentially more configurations than the radial, one-way distribution systems of the past. These added capabilities, however, make the system reconfiguration with a much more complex problem causing utilities to question if they are operating their distribution systems optimally. In addition, tools like Supervisory Control and Data Acquisition (SCADA) and Distribution Automation (DA) allow for systems to be reconfigured faster than humans can make decisions on how to reconfigure them. As a result, this paper seeks to develop an automated partitioning scheme for distribution systems that can respond to varying system conditions while ensuring a variety of operational constraints on the final configuration. It uses linear programming and graph theory. Power flow is calculated externally to the LP and a feedback loop is used to recalculate the solution if a violation is found. Application to test systems shows that it can reconfigure systems containing any number of loops resulting in a radial configuration. It can connect multiple sources to a single microgrid if more capacity is needed to supply the microgrid’s load.
文摘针对高速分布式地震勘探对多节点RS485和以太网互联的需求,该文采用物理层以太网集成芯片DP83848和STM32微控制器,设计一种低成本以太网—RS485网关,并利用"分时切换"和"前后台程序"配合的方法,对RS485及TCP/IP协议栈进行优化,以便提高运行效率。测试表明:该网关可实现2 M RS485网络和100 M以太网互联,当采集节点为24位1 kb/s采样率的数字检波器时,单网关可连接地震通道数超过100道。
