基于自适应分段双下垂的孤岛交直流混合微电网功率协调控制
Control Strategy of Islanded AC/DC Hybrid Microgrid Power System Based on Adaptive Segmented Double-Droop
米阳 1顾符亦可 1李春煦 1鲍薇 2燕跃豪 2刘晓辉 2杨亚男2
作者信息
- 1. 上海电力大学电气工程学院,上海市 200090
- 2. 国网河南省电力公司郑州供电公司,郑州市 450006
- 折叠
摘要
为提高孤岛交直流混合微电网中双向AC/DC变换器的功率分配精度,提出一种自适应分段双下垂控制策略.首先利用归一法将交流频率和直流电压变换到同一区间,确定变换器传输功率.其次,为合理规划双向AC/DC变换器的工作模式,对交流子网和直流子网进行负载状态划分;设置动作阈值避免频繁启停,当功率差额超过启动阈值时,Ⅰ段采用传统双下垂控制,Ⅱ段将自适应函数加入双下垂控制,使双向AC/DC变换器能在子网有功差额较大时更快达到功率平衡,从而提高双向AC/DC变换器的协调控制能力和使用寿命;再对系统进行解耦分析验证所提控制策略的稳定性.最后,在Matlab/simulink和Rtlab中搭建孤岛交直流混合微电网对提出的自适应分段双下垂控制策略进行分析验证.
Abstract
An adaptive segmented double-droop control strategy is proposed to improve the power-allocation accuracy of bidirectional AC/DC converters in islanded AC/DC hybrid microgrids.First,a normalization method is used to convert the AC frequency and DC voltage into the same interval to determine the transmission power of the converter.Second,to plan the operating mode of the bidirectional AC/DC converter reasonably,the load states of the AC and DC subnets are divided.By setting the action threshold to avoid frequent starts and stops,an adaptive function is selected to add the stage Ⅱ droop expression when the power difference exceeds the starting threshold by maintaining the conventional double-droop control in segment Ⅰ.Thus,the bidirectional AC/DC converter can attain power balance faster when the active power difference of the subnetwork is large,which improves the coordinated control ability and service life of the bidirectional AC/DC converter.The system is decoupled to verify the stability of the proposed control strategy.Finally,an islanded AC/DC hybrid microgrid is constructed in MATLAB/Simulink and RTLAB to analyze and verify the adaptive segmented double-droop control strategy proposed herein.
关键词
交直流混合微电网/双下垂控制/双向AC/DC变换器/功率协调控制Key words
AC/DC hybrid microgrid/dual-droop control/bidirectional AC/DC converter/power coordinated control引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据