Research On Voltage Stability Analysis And Under-Voltage Load Shedding Scheme Of Hebei South Network

With the rapid economic and social development, the rapid growth of grid load. Especially with the Internet made global energy, power grid interconnection between bound more closely, as an important part of the power grid safe and stable operation, has a crucial characteristic of layering and zoning study of voltage stability problems. As security and stability of automatic control third line of defense, voltage load shedding is an important measure to maintain network security, reliable operation, and to ensure good power quality. In this paper, a detailed study of the mechanism of static voltage stability, on this basis, the analysis of the active margin index, reactive- Advantages voltage sensitivity index, N-1, N-2 and other commonly used indicators of static voltage stability index and defect integrated application of these kinds of static voltage stability index to find the whole network voltage weak areas, weak areas in order to determine the whole network voltage. According identified weak areas, choose low-voltage load shedding equipment installation site. Hebei South network run data, for example, the application of reactive power- voltage sensitivity calculation method to determine the amount of each wheel voltage load shedding weak area, as well as the delay of each round in order to determine the voltage load shedding program, application simulation verification. The simulation results show that the voltage load shedding program development at all kinds of serious fault conditions, all the correct action, the voltage returns to a stable operating level, and no malfunctions as well as over-cutting, less cut phenomenon, and a clear idea of the design, reducing load calculation is simple, after changes in network structure, can quickly adjust accordingly, has a production application.