摘要
介绍一种考虑数字控制延时影响时LCL型配电网静止同步补偿器(D-STATCOM)的系统稳定性研究方法。通过分析延时给有源阻尼及其等效的虚拟电阻带来的影响,揭示延时环节与系统稳定性的内在联系。引入一个有源阻尼系数的临界值,将滤波器谐振频率划分成高、低两个频域,再通过判断有源阻尼系数与临界值之间的大小关系,分别在两个不同的谐振频域内推导出计入数字控制延时影响时的系统稳定条件。仿真和实验分别对研究方法进行了验证。
This paper introduced a method of system stability for LCL type D-STATCOM withactive damping when the effect of digital controlling time-delays is considered.By analyzing theimpact on active damping and its equivalent virtual impedance caused by time-delays,the inherentrelationship between time-delays and system stability is illustrated.Specially,a critical value of activedamping coefficient is proposed to separate LCL resonance frequency into two distinct resonancefrequency regions.And then the necessary conditions for system stability are deduced by identifyingthe relationship between the active damping coefficient and the critical value in the separated highand low resonance frequency regions.Simulation and experimental results verified the presented method.
作者
夏伟
康劲松
Xia Wei;Kang Jinsong(School of Electronic and Information Engineering Tongji University,Shanghai 201804 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2017年第14期205-216,共12页
Transactions of China Electrotechnical Society
基金
国家重点研发计划资助项目(2016YFB0100700)
