Under the large-scale power grid platform

one of the key issues of large-scale trans-regional hydropower transmission via ultra-high voltage direct current (UHVDC) is how to fully utilize the load differences of receiving power grids and the generation characteristics of multiple power sources to accommodate external hydropower and mitigate pressures on peak shaving load. Against the background of East China power grid (ECPG) and proceeding from demand on practical application

this paper proposes two coordinated and optimized dispatching models (the power-control model and the energy-control model) for large-scale trans-regional hydropower transmission via UHVDC in regional and provincial power grids. In the two dispatching models

power is supplied according to demand with the multiple power sources supplementing each other. The simulation scheduling results from ECPG on a typical day in 2013 show that

compared with the present empirical scheduling

the average peak shaving ratio of various provincial and municipal power grids with the power-control model and the energy-control model is improved by 21.3% and 39.3%

respectively. The effect of peak shaving is very significant. Moreover

the daily 96-point test using the power-control model is carried out in ECPG in the whole year of 2013. The results show that the annual average peak shaving ratio is improved by 20.5%

fully demonstrating the immense potential of optimal hydropower transmission and allocation.