摘要
数字控制系统中的延时对并网变流器的稳定性有着重要影响,因此在建立并网变流器数学模型的基础上,根据Nyquist判据分析了延时环节对系统稳定性的影响。针对延时环节易导致系统不稳定的问题,基于零极点对消原理提出了一种基于一阶微分的并网变流器控制策略,分析结果表明该方法可削弱控制延时对系统稳定性的不利影响,显著提高系统的稳定性。最后通过仿真和实验验证了一阶微分控制策略的有效性。
The delay in digital control system has an important impact on the stability of the grid-connected converter.Therefore,the model of grid-connected converter was firstly established in this paper,and then the influence of delay on system stability was analyzed according to Nyquist criterion.Aiming at the problem that the delay can easily lead to system instability,a control strategy of grid-connected converters based on first-order differential was proposed based on the principle of zero-pole cancellation.The analysis results show that this method can weaken the effect of delay on system stability and improve the stability of the system significantly.Finally,the effectiveness of the first-order differential control strategy is verified by the simulation and experimental results.
作者
仰慧
杨树德
李旺
张继勇
张新闻
YANG Hui;YANG Shude;LI Wang;ZHANG Jiyong;ZHANG Xinwen(College of Electrical,Energy and Power Engineering,Yangzhou University,Yangzhou 225000,China;School of Electrical and Information Engineering,North Minzu University,Yinchuan 750021,China)
出处
《电工技术》
2022年第15期17-20,共4页
Electric Engineering
基金
江苏省大学生创新创业训练计划项目(编号202111117088Y)
江苏省高等学校自然科学研究资助项目(编号19KJB470038)
国家自然科学基金项目(编号51867001)
宁夏自然科学基金资助项目(编号2020AAC03210)。
关键词
并网变流器
数字控制延时
稳定性
一阶微分
grid-connected converter
delay of digital control
stability
first-order differential
