中国电力2025，Vol.58Issue(3)：31-42,12.DOI:10.11930/j.issn.1004-9649.202406059
计及频率适应和快速稳定特性的多端直流电网改进协调控制策略
Improved Coordinated Control Strategy of Multi-terminal DC Grids Considering Frequency Adaptation and Fast Stabilization Characteristics
摘要
Abstract
Multi-terminal flexible DC transmission(VSC-MTDC)technology has a wide range of application prospects in large-scale and wide-range multiple types of renewable energy grid-connection and outward transmission.To address the influence of AC-DC coupling on DC voltage and AC system frequency under large unbalanced power disturbances of flexible DC network,an improved coordinated control strategy based on DC voltage sag control is firstly proposed to eliminate the DC network voltage deviation from the rated operation point before and after the disturbances.And then the adaptive sag coefficients are introduced to improve the DC network voltage steady state recovery rate and certain control reliability.Thirdly,the adaptive capacity enhancement of the improved coordination control frequency is analyzed in order to realize the participation of converter station in AC system frequency regulation and control,and to make up for the lack of AC-side FM capacity.Finally,a simulation model of new energy transmission via four-terminal DC grid is constructed based on the PSCAD/EMTDC,which verifies the feasibility and effectiveness of the proposed improved coordinated control strategy and its AC grid frequency regulation.关键词
柔性直流电网/下垂控制/协调控制/加速策略/频率调控Key words
voltage source converter multi-terminal DC/sag control/coordinated control/acceleration strategy/frequency control引用本文复制引用
吴云锐,张建坡,田新成,应恺锋,陈忠..计及频率适应和快速稳定特性的多端直流电网改进协调控制策略[J].中国电力,2025,58(3):31-42,12.基金项目
国家重点研发计划资助项目(响应驱动的大电网稳定性智能增强分析与控制技术,2021YFB2400800). This work is supported by National Key Research and Development Program of China(Response-Driven Intelligent Enhancement Analysis and Control Technology for Large Power Grid Stability,No.2021YFB2400800). （响应驱动的大电网稳定性智能增强分析与控制技术,2021YFB2400800）
