With the increase of large-capacity power bases and the rapid development of ultra-high voltage AC and DC power supply

large-capacity power and long distance transmission will become a normal state of affairs. The demand on trans-regional transmission of wind-photovoltaic clean energy by ultra-high voltage direct current(UHVDC)system is steadily growing. To solve the transmission problem due to the random fluctuation of wind-photovoltaic power

a bundled wind-photovoltaic-thermal power transmission plan is used. In view of the actual situation of the DC generation plan being relatively independent of the wind-photovoltaic power generation and the supporting thermal power inefficient in its part in wind-photovoltaic power adjustment

an integrated transmission scheduling model for bundled wind-photovoltaic-thermal power transmission by UHVDC system is proposed. The model can deal with the coordination problem between the wind-photovoltaic power

supporting thermal power

electric power trading and DC plan. The proposed model has been applied to a case in point. Simulation results show that the participation in adjustment of supporting thermal power and DC plans can effectively enhance the transmission capacity of wind-photovoltaic power.