Defense Schemes against Power System Blackouts in China with High Load Growth

This paper describes the experiences, new requirements and prospects of security defense schemes for power systems in China. Adaptive optimal control schemes have served well for 2-3 years to periodically refresh the decision table for preventive control and emergency control to track operating conditions. These schemes are supported by EEAC that is a quantitative method for stability analysis, novel optimization algorithms and case-based parallel processing. After thoroughly investigating recent blackouts around the world, a wide-area measurement based defense scheme, named as Wide ARea Monitoring Analysis Protection-control (WARMAP) is proposed to against cascading blackouts. Its essentials are: (1) acquisition and integration of wide area measurements from RTUs, PMUs, fault recorders and protection systems; (2) trajectory-based data mining and security analysis; (3) adaptive optimization of preventive control, emergency control and restoration control; (4) coordination among various stability controls. Based on relevant research achievements, such a scheme is well on the way to building in East China Power Grid.