计及直流跨区互联系统频率稳定的多调频资源协调优化研究OA

The widespread application of ultra-high voltage direct current(UHVDC)technology is driving the transition of power systems towards a mode of regional grid interconnection.As synchronous generators in power systems are gradually replaced by power electronic equipment,such as new energy sources and large-scale HVDC systems,the power systems face increased frequency security risks.Fully utilizing the frequency support capabilities of various frequency regulation resources has become an effective approach.Within a region,flexible coordination between conventional units and new energy units should be considered;between regions,utilizing HVDC systems can achieve flexible frequency support.To this end,this paper establishes a frequency response model for an inter-regional HVDC interconnected system.This model considers the impact of HVDC,new energy units,and conventional units on frequency dynamics,and describes the relationship between power disturbances and frequency deviations in different regions.Based on this,a coordinated optimization model for multiple resources considering frequency stability is proposed.To ensure the tractability of frequency security constraints,this paper proposes an iterative algorithm of simplification-approximation-correction,which strictly ensures frequency security while embedding the optimization model.Case study results demonstrate the effectiveness of the proposed method and highlight the advantages of coordinating multiple resources in an HVDC interconnected system.