Research Of Distribution Network State Compositive Visualization Based On Synchronous Data

With the increase of renewable energy penetration,the dynamic characteristics of distribution networks are becoming more complex.The emergence of the wide area measurement system light(WAMS Light)fills the deficiency in the dynamic monitoring of the low-voltage power grid.The phasor measurement unit light(PMU Light)is deployed in the national distribution network.The scale of high-precision and high-density data provided by the device will become larger and larger.Power system visualization is an important means to assist the state awareness of the power grid.Comprehensive visualization of large-scale state data and auxiliary information can directly reflect the operation of power system.Under the background that there is no effective presentation method for synchronous phasors in distribution networks,it is urgent to design an efficient and intuitive visualization method for synchronous data based on the characteristics of distribution networks.Aiming at this problem,this paper constructs the processing flow,state presentation,real-time analysis and information inversion of synchronous data in wide area distribution network.The specific research contents are as follows:(1)Application analysis of visualization.The application mode of WAMS Light data visualization is analyzed.Combined with the flow,types and characteristics of synchronous data,data processing task is undertaken by synchronous data server and visualization platform.The former provides data support for advanced applications,while the latter mines data value and visualizes analysis.According to the characteristics of dense devices and flexible layout in distribution network,suitable visualization requirements are proposed.Based on this,a modular visualization platform system architecture is constructed to provide guidance for the realization of subsequent visual design.(2)Distribution network operation visualization.Construct frequency contour layer,synchronous voltage phasor layer,non-electricity information layer and trend chart light superimposed in geographic information system(GIS),and combine the strategy of agglomeration hierarchy aggregation and presentation control to ensure the visuality and timeliness of the state view.The presentation of multi-layer,multi-angle and multi-screen enables dispatchers to simultaneously capture the real-time state and change trend of different measurement information in multiple monitoring areas,so as to achieve a comprehensive overview of the horizontal and vertical operation of distribution network.(3)Distribution network analysis visualization.Decouple data,program and visualization.The data part constructs two interfaces of segmented window and sliding window,and preprocesses raw data to improve reliability.In the program part,the frequency is counted in real time in the segmented window,and the backup database is used to prevent statistical interruption.The phase difference low frequency oscillation signal is analyzed in the sliding window to monitor the frequency dynamic event.Based on Python,an on-line access module for custom programs is also constructed.The visualization part schematizes the analysis result and power quality,and records the dynamic event frequency trajectory and spatial characteristics.(4)Distribution network historical information inversion.The historical information includes historical measurement data,analysis results and monitoring events.The dynamic inversion and oscillography viewing system is constructed based on the state visualization method;the interactive panel aggregates discrete historical analysis data;the event invertor reproduces the event occurrence process with the multi-frame three-dimensional frequency spatial distribution map.(5)Development and application of visualization platform.A synchronous data visualization platform is developed for real-time monitoring,data mining and information inversion.Based on the distribution network information provided by PMU Light,a distributed energy storage system control platform is constructed,which realizes the functions of system mode dispatch,power fluctuation stabilization,peak-shaving and valley-filling.The field tests show that the distributed energy storage system can improve the renewable energy accommodation.