Study On Power System Visualization Under Dynamic Monitoring

The rapid development and widely use of Wide-Area Measurement System (WAMS), makes it possible to monitor and control power system dynamic process. WAMS, SCADA and EMS will bring a new system — (WAMS|SCADA)/EMS.Progresses will be made in monitoring, grid calculation and control areas in EMS. This thesis discusses theories and technologies in power system visualization under dynamic monitoring.In order to form a scheme suitable for power system dynamic monitoring under new infrastructure, information flow is carefully analyzed with informatics and ergonomics. Information analysis model in current EMS is analyzed. To make improvements in some irrationalities, revised information analysis model is presented. New power system information visualization infrastructure is built to realize revised analysis model. This infrastructure is made up with two parts power system information display in two- dimension space and power system display in three-dimension space.Voltage has always been key point to be monitored. Voltage visualization made by foreigners is presented, especially voltage contours for the whole power grid. Voltage must be compared to conquer its massive data property. Dispatchers can fully understand power system voltage situation by monitoring voltage surface in three-dimension space.Generator's dynamic behavior is the most important dynamic behavior in power system, so it necessary to monitor generators' dynamic behavior. The large dimension, power system's structure and special working status will cause inter-area oscillations. Inter-area oscillation will greatly reduce power flow in tie-line and affect power system's security. Under the new infrastructure, PMUs collect angle variables at the same time with high speed. DFT is made on the collected data in central station to determine the dominate oscillation mode. Then make out the generator group under the dominant oscillation mode, coherency is made by calculating the phasor angle of this frequency. Inter-area oscillation and its dynamic trend can be monitored in three-dimension space.