电力系统自动化2025，Vol.49Issue(8)：189-196,8.DOI:10.7500/AEPS20240515023
大规模水电直流外送柔直同频控制与常直FLC协同控制策略
Coordinated Control Strategy Between Flexible DC Synchronous Frequency Control and Conventional DC Frequency Limit Controller for Large-scale Hydropower DC Transmission
摘要
Abstract
After the DC asynchronous interconnection of the Yunnan power grid with the main grid of China,it becomes difficult to achieve real-time and automatic sharing of frequency regulation resources across the entire grid.Consequently,the issues related to system frequency stability have become prominent,and frequency regulation and control challenges have emerged.Flexible DC synchronous frequency control can achieve error-free frequency regulation with fast response and no frequency regulation dead-band,and it can actively provide voltage support during frequency regulation.Compared with flexible DC synchronous frequency control,the conventional DC frequency limit controller(FLC)has a large power regulation capacity and sufficient reserve,but it suffers from a frequency regulation dead-band and may induce voltage fluctuations during frequency regulation.Combining the advantages of both,this paper proposes a coordinated control strategy based on the flexible DC synchronous frequency control and the conventional DC FLC.When a disturbance occurs in the system,the flexible DC synchronous frequency control is prioritized to start.Once the output of the flexible DC synchronous frequency control exceeds its limit,the conventional DC FLC starts.Furthermore,during the operation of the conventional DC FLC,the reactive power support control of flexible DC is engaged.A back-to-back DC test system and a large DC asynchronous interconnection power grid system are constructed in the PSCAD/EMTDC simulation software to verify the effectiveness of the proposed coordinated control strategy.关键词
直流异步联网/柔性直流/常规直流/同频控制/频率限制器/无功支援/电压支撑/协同控制Key words
DC asynchronous interconnection/flexible DC/conventional DC/synchronous frequency control/frequency limit controller(FLC)/reactive power support/voltage support/coordinated control引用本文复制引用
束洪春,邵宗学,赵伟,何廷一..大规模水电直流外送柔直同频控制与常直FLC协同控制策略[J].电力系统自动化,2025,49(8):189-196,8.基金项目
国家自然科学基金重点资助项目(52037003) （52037003）
云南省重大科技专项资助项目(202402AG050006). This work is supported by National Natural Science Foundation of China(No.52037003)and Key Science and Technology Project of Yunnan Province(No.202402AG050006). （202402AG050006）
