南方电网技术2023，Vol.17Issue(11)：10-21,12.DOI:10.13648/j.cnki.issn1674-0629.2023.11.002
大规模风电接入的特高压混合级联直流系统送端频率控制策略
Frequency Control Strategy for Sending-End of Hybrid Cascaded UHVDC System Interconnceted with Large-Scale Wind Power
摘要
Abstract
Aiming at the frequency out-of-limit problem caused by the high proportion of wind power in the power grid at the sending-end of hybrid ultra-high voltage direct current(UHVDC)system,the coordinated frequency control strategy of power grid at the sending-end by wind power and hybrid DC system is proposed.Firstly,the topology of hybrid DC system is introduced,in which the structure of the line commuted converter in series with modular multilevel converter is adopted at the sending and receiving ends;Secondly,the additional frequency control strategy considering primary frequency and inertia characteristics is introduced in the wind turbines and the line commuted converter station respectively,and the virtual inertia control strategy is introduced in the voltage source converter(VSC)station;The timing action rules of wind power and hybrid DC system coordinating and participating in power grid frequency control and the voltage coordination strategy between converter stations are designed;At the same time,the mechanism of wind power and hybrid DC system in frequency control is qualitatively analyzed based on the frequency response model of wind power and DC integrated system,and design method of related control parameters is put forward.Finally,a model is built in PSCAD/EMTDC for simulation verification.The simulation results show that the proposed frequency coordinated control strategy can improve the inertia and primary frequency capability of the sending-end system and effectively improve the frequency stability problem of the AC system under different operating conditions.关键词
新能源/混合特高压直流系统/频率控制策略/惯量/一次调频Key words
renewable energy/hybrid UHVDC system/frequency control strategy/inertia/primary frequency分类
信息技术与安全科学引用本文复制引用
李昊,赵成勇,熊小玲..大规模风电接入的特高压混合级联直流系统送端频率控制策略[J].南方电网技术,2023,17(11):10-21,12.基金项目
国家自然科学基金面上项目(52277176). Supported by the General Project of the National Natural Science Foundation of China(52277176). （52277176）
