Analysis on trends in emergency control technology of cross-regional interconnected power systems

Grid interconnection, cross-regional power transmission and intermittent energy source injection raise higher requirements for power system emergency control technology. In the light of stability problem features such as transition of stability forms during system dynamic process, complication of voltage and VAR dynamics and intensification of cross-regional impact of regional control, as well as new control equipment characteristics of fast and flexible adjustment capability, this paper presents an analysis of trends in control strategy such as use of remote regional grid information in real-time decision-making, wide-area coordination of control time sequence, coordination of stability control systems and so on. It is also pointed out that capability of control devices should be further enhanced in such aspects as countermeasures against uncertainties of control signal transmission time delay due to network communication, wide-area time sequence coordination, integration of event triggered feed-forward control and response triggered feedback control, and so on. © 2011 State Grid Electric Power Research Institute Press.