南方电网技术2025，Vol.19Issue(1)：150-159,10.DOI:10.13648/j.cnki.issn1674-0629.2025.01.015
孤岛混合微电网电源故障后电压/频率无差控制
Error-Free Control of Voltage/Frequency After Power Source Failure in Isolated Hybrid Microgrids
摘要
Abstract
Most of the interconnecting converters in island hybrid microgrids are grid-following converters,which change their control strategies to switch operation modes by means of remote communication order.When the system operation mode suddenly switches and communication failure or delay happens,the grid-following converters cannot quickly change the control strategies,resulting in voltage and frequency collapse.To solve the above problems,a new type of interconnected converter called grid-forming converter is introduced,which consists of a pair of back-to-back DC/DC and DC/AC converters.The grid-forming converter only needs local communication,and can complete seamless switching of operation modes by measuring and controlling the DC voltage on the DC-DC side,the voltage of interconnected capacitors and the AC frequency on the DC-AC side,and improves the resilience of hybrid microgrids operation.The small size magnitude drop of voltage or frequency will happen after microgrids operation modes switching due to the grid-forming converter control strategy supported by photovoltaic(PV)generations.So a coordinated control strategy between the grid-forming converter and the virtual DC motor energy storage is proposed.The simulation results show that the frequency of AC side and the voltage of DC side can be quickly stabilized at the rated value after the sudden failure of either side of AC/DC voltage sources in isolated island hybrid microgrids under the synergistic action of the grid-forming converter and virtual DC motor energy storage.关键词
混合微电网/构网器/模式无缝切换/虚拟直流电机储能/无差控制Key words
hybrid microgrids/grid-forming converter/seamless switching of modes/virtual DC motor energy storage/error-free control分类
信息技术与安全科学引用本文复制引用
李军,包那琴,陈建华,吕干云,陈遗志..孤岛混合微电网电源故障后电压/频率无差控制[J].南方电网技术,2025,19(1):150-159,10.基金项目
江苏省碳达峰碳中和科技创新项目(BE2022003-4).Supported by the Carbon Peak and Carbon Neutral Technology Innovation Project of Jiangsu Province(BE2022003-4). （BE2022003-4）
