51results about How to "Improve the level of practicality" patented technology

The invention relates to a power distribution network reactive power optimized dispatching method and a power distribution network reactive power optimized dispatching system based on a virtual power plant. Each node accessed along a feed network is connected and provided with a monitoring device. The control process comprises the steps that: when a current dispatching time period of the virtual power plant begins, the monitoring devices upload real-time voltage effective values of the accessed nodes to a centralized controller of the virtual power plant; the centralized controller establishes a reactive power optimized dispatching model and solves the model to obtain reactive output set values of distributed power supplies; and the centralized controller sends the reactive output set values to the distributed power supplies, and the distributed power supplies correspondingly output reactive power to a feeder line. Through the optimized dispatching of the centralized controller, the sum of values that voltages of the nodes in the power distribution network deviate from a rated value is minimal, the total cost of carrying out reactive dispatching on the distributed power supplies is minimal, the power supply quality and reliability is improved, the auxiliary service function of the distributed power supplies is fully exerted, the service efficiency of the distributed power supplies is improved, and the development and use of the distributed power supplies are promoted.

A method for processing recording file of multiple-plug-in component embedded type relay protection fault information system substation (embedded type station) provided by the invention is applied to the electric network relay protection fault information management system, comprises the following contents: the embedded type substation is of multiple-plug-in component structure; each plug-in component can independently operate an access or rolling-out type communication regular; each plug-in component can share data by one main CPU plug-in component; each plug-in component can be communicatedby Ethernet,; the access plug-in component can collect recording wave and tidy the data as a recording file with standard COMTRADE format, meanwhile, can manage the plug-in component recording file and list; the access plug-in component can notify the information generated by the recording file to a main CPU plug-in component; the main CPU plug-in component can acquire recording file from each access plug-in component and save the recording file to the present plug-in component, and can manage the recording file and list; the main CPU plug-in component takes charges of notifying the information generated by the recording file to the rolling-out plug-in component; the rolling-out plug-in component can acquire the recording file from the main CPU plug-in component according to the requirement of the main station, and can convey the recording file to the main station.

The invention provides a preparation method and a preparation device for chalcogenide glass. The method comprises three steps: first, vacuum low-temperature purification: conducting purification on glass raw materials at a first temperature under a vacuum condition, so as to remove impurities; second, vacuum high-temperature melting: melting the purified glass raw materials at a second temperature under the vacuum condition, so as to obtain molten glass; third, material discharge and formation: discharging the molten glass, and forming a finished glass product, wherein the pressure of the vacuum condition is lower than 1.0*10<-2> Pa. The chalcogenide glass product prepared according to the three-step preparation method is high in optical homogeneity, excellent in spectrum penetration performance, and large in size.

The invention relates to a method, for analyzing power system power oscillation disturbance source, based on SCADA (supervisory control and data acquisition) historical data search. The method includes the steps of firstly, calling a time sequence database interface of an EMS (enhanced message system) to obtain historical data of an active value of power equipment in a time period in batches, and placing the data in a cache according to a set structure and allowing the same to wait for queuing calculation; secondly, queuing calling, calling an oscillation feature iterative function of historical data in each queue for iterative processing, inputting new data on the basis of a previous state, calculating feature quantity of active oscillating of one grid equipment, comparing with a preset fixed value, and returning equipment state; thirdly, if equipment measurement oscillation occurs, generating and returning oscillation records; and fourthly, sorting and positioning an oscillating source, sorting collected records according to oscillation starting time, and positioning the first equipment as the oscillating source. By the method, data accuracy is improved, convenience and practicality are achieved, and credibility of real-time positioning result information of the oscillating source is high.