Flexible Envelope Model in Response to Wind Power Ramp Events at Multi-Time Scales

Abstract

The impact mechanism of wind power ramp events on the system reserve demand is studied at multi-time scales, reserve optimization problem in response to wind power ramp events is transferred into optimal flexibility envelope tracking problem, flexibility envelope is used to determine the reserve deployed pattern and unit output adjustment pattern of system, so as to balance the reliability and safety during power system operation. In numerical examples, the dispatch strategies between flexible envelope model at 5-min time-scale, traditional reserve decision model at 15-min and hourly time-scale in response to wind power ramp events are contrasted, which shows the superiority of the dispatch strategy of flexible envelope model at 5-min time-scale in response to wind power ramp events.