With the increase of renewable energy integration

the conflict of renewable energy accommodation has become more and more prominent. The renewable energy can be accommodated in a wider area by the application of high voltage direct current transmission(HVDC). At present

the direct current(DC)delivery mode includes two types: medium-term & long-term transaction and surplus renewable energy spot transaction. In order to study the impacts of these two different delivery modes on renewable energy accommodation

a quantitative model of renewable energy accommodation analysis considering HVDC transmission system based on time-sequence simulation is established. This model is used to analyze the renewable energy curtailment rate

the renewable energy component in HVDC

the renewable energy component in total generation capacity

and the number of HVDC utilization under the two delivery modes of medium-term and long-term transaction and short-term spot transaction. Based on the actual data of a province in Northwest China

the validity of the proposed model is verified. Based on the model and analysis conclusion

the HVDC plan is optimized and the renewable energy curtailment rate is effectively reduced on the premise that the number of HVDC utilization is guaranteed.