摘要
高比例新能源接入导致微电网惯量低、抗干扰能力弱、电压波动性强。储能变流器作为平抑新能源功率波动、支撑电网电压和频率稳定的重要设备,在微电网中的应用越来越广泛。针对微电网储能变流器控制优化技术的发展,文章首先在三电平储能变流器拓扑方面,聚焦储能变流器自身非线性因素对输出波形的影响,归纳总结输出波形非线性的产生机理及优化策略;在此基础上,深入探讨弱电网下跟网型储能变流器的失稳机理,梳理增强稳定性的优化策略;同时,整理了构网型储能变流器的控制目标及架构,分析总结储能变流器的稳定性问题及控制优化策略;最后,对相关技术的优化方向进行了展望,为微电网三电平储能变流器优化控制提供参考借鉴。
The connection of a high proportion of renewable energy to the grid leads to low inertia,weak anti-disturbance ability and strong voltage volatility of micro-grid.Serving as an important device to stabilize power fluctuations of renewable energy and support voltage and frequency stability of grid,power converter system(PCS)is being widely used in microgrid.In accordance with the development of micro-grid PCS optimal control technology,this paper focuses on the influence of PCS's own nonlinear factors on output waveform from three-level PCS topology perspective,and then summarizes the generation mechanism and optimization strategy of PCS's output waveform.On this basis,the instability mechanism of the grid-following type PCS within weak-grid is discussed in depth,and the optimal control strategy to strengthen stability of the micro-grid system is summarized.At the same time,the control objectives and control architecture of the grid-forming PCS are sorted out,and the problems of the micro-grid system stability and control optimization strategy of PCS are analyzed and summarized.Finally,the prospects in optimization direction of related technologies are put forward to provide reference for the optimization control of micro-grid three-level PCS.
作者
周京华
李津
ZHOU Jinghua;LI Jin(Inverter Technology Engineering Research Center of Bejing,North China University of Technology,Beijing 100144,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第8期3137-3147,共11页
High Voltage Engineering
基金
国家重点研发计划(2021YFE0103800)
北京市高水平创新团队建设计划(IDHT20180502)。
关键词
微电网
储能变流器
跟网型控制
构网型控制
优化控制
稳定性分析
microgrid
power converter system
grid-following control
grid-forming control
optimal control
stability analysis
