南方电网技术2024，Vol.18Issue(3)：146-155,10.DOI:10.13648/j.cnki.issn1674-0629.2024.03.016
参与电网调频的多端柔性直流输电系统改进下垂控制策略
Improved Droop Control Strategy Involved in Power Grid Frequency Regulation for VSC-MTDC Transmission Systems
摘要
Abstract
The traditional droop control strategy involved in power grid frequency regulation can take advantage of frequency devia-tion and DC voltage to achieve mutual support between the frequencies of voltage source converter based multi-terminal flexible direct current transmission systems(VSC-MTDC).However,the droop coefficient of traditional DC voltage is fixed.The operation status of power grid and converter station capacity are neglected when allocating the unbalanced power which results in the converter station overload and weak grid frequency fluctuate greatly when bearing power.To solve this problem,an improved droop control strategy participating in power grid frequency regulation is proposed.Firstly,the power energy allocation relationship of the traditional droop control strategy involved in power grid frequency regulation is analyzed.Secondly,the voltage droop coefficient is redesigned considering the frequency margin of the power grid and the capacity of the converter station itself.The control strategy proposed can ensure the converter station not overloaded and the stable operation of weak power grid when the system is disturbed.Finally,simulation verification is conducted through MATLAB/SIMULINK,the results show that the proposed strategy can improve the frequency adjustment capability of multi-terminal flexible DC transmission systems,and operating ability of system is effectiely improved.关键词
传统下垂控制/多端柔性直流输电系统/频率裕度/功率裕度/弱电网Key words
traditional droop control/VSC-MTDC/frequency margin/power margin/weak power grid分类
信息技术与安全科学引用本文复制引用
董志国,徐全海,陈琦,刘鸿鹏,张书鑫..参与电网调频的多端柔性直流输电系统改进下垂控制策略[J].南方电网技术,2024,18(3):146-155,10.基金项目
国家自然科学基金资助项目(52207189) （52207189）
国家能源集团青海公司科技项目"德令哈光伏发电公司配置储能的新能源场站并网调控关键技术研究及应用"(CEZB220407022). Supported by the National Natural Science Foundation of China(52207189) （CEZB220407022）
the Science and Technology Project of National Energy Group Qinghai Electric Power Co.,Ltd.(CEZB220407022). （CEZB220407022）
