Day-ahead Optimal Dispatch Model for Coupled System Considering Ladder-type Ramping Rate and Flexible Spinning Reserve of Thermal Power Units

In northern China, thermal power units (TPUs) are important in improving the penetration level of renewable energy. such areas, potentials coordinated dispatch energy sources (RESs) and TPUs can be better realized, if RESs connected to grid at same point common coupling (PCC) dispatched as a coupled system. Firstly, definition system is introduced, followed by an analysis on its characteristics. Secondly, based operation characteristics deep peak regulation (DPR) system, constraint ladder-type ramping rate applicable for day-ahead proposed, corresponding flexible spinning reserve further established. Then, considering these constraints ancillary services, optimal model Finally, operational advantages analyzed several case studies real-world Liaoning province, China. The numerical results show that improve economic benefits under existing policies.