现代电力2024，Vol.41Issue(6)：1032-1042,11.DOI:10.19725/j.cnki.1007-2322.2022.0358
混合直流供电微电网系统的直流自适应调频方法
DC Self-Adapt Frequency Regulation Method for Hybrid DC Power Supply Microgrid System
摘要
Abstract
Frequency fluctuations will inevitably occur when the microgrid with hybrid DC power supply of line commut-ated converter(abbr.LCC)-voltage source converter(abbr.VSC)is disturbed.In order to keep the frequency within the specified range under the different kinds of disturbances,a DC frequency regulation method with self-adapt disturbance changes was proposed in the LCC-VSC supplying microgrid system.Firstly,the critical droop coefficient required to pull the system frequency into the specified range after disturbance was theoretically deduced,and based on this,a primary frequency regulation method of variable droop coefficient with self-adapt disturbance changes was proposed to rapidly control the dis-turbed system frequency within the specified range by means of the rapidity of DC reaction.Secondly,as the primary fre-quency regulation is still a differential regulation,the second-ary frequency regulation strategy of variable reference power was proposed.Finally,a simulation model was established on the PSCAD/EMTDC platform.The results show that when the load changes within 12.5%and the light changes within 10%,the primary frequency regulation can restore the frequency de-viation to within 0.2 Hz,and when the load changes within 15%,the secondary frequency regulation can achieve zero-er-ror frequency regulation,which verifies the effectiveness of the proposed strategy.关键词
混合直流供电/微电网/变下垂系数/自适应调频Key words
hybrid DC power supply/microgrid/variable droop coefficient/self-adapt frequency regulation分类
信息技术与安全科学引用本文复制引用
蔡梦路,徐晓宇,贾秀芳,赵成勇,郭春义,宣佳卓..混合直流供电微电网系统的直流自适应调频方法[J].现代电力,2024,41(6):1032-1042,11.基金项目
国家电网有限公司科技项目(5500-202019066A-0-0-00).Project Supported by Science and Technology Project of State Grid Corporation of China(5500-202019066A-0-0-00). （5500-202019066A-0-0-00）
