摘要
为抑制逆变器间动态调整过程差异较大所引起的环流,提出一种新型幂次变加速趋近律的滑模控制策略来抑制环流。通过功率特性得出功率与输出电压幅值相角变化率的微分非线性关系,基于滑模面实现控制解耦,根据当前状态位置自动调整幂次项系数而改变趋近速度,使系统快速削弱输出电压幅值与相角波动,更快趋近稳态而达到显著环流抑制效果。仿真结果验证了改进趋近律下系统输出动态响应更快且抗干扰能力强,环流得到极大程度的抑制。
To suppress the circulating current caused by the large difference in the dynamic adjustment process between inverters,a novel sliding-mode control strategy based on the power variable rate acceleration reaching law is proposed to suppress the circulating current.The differential nonlinear relationship between power and the changing rates of out⁃put voltage amplitude and phase angle is obtained through the power characteristics.The control decoupling is realized based on the sliding-mode surface,and the power coefficient is automatically adjusted according to the current state po⁃sition to change the reaching law,so that the system quickly weakens the output voltage amplitude and phase angle fluc⁃tuations,approaching the steady-state faster and achieving a significant circulation current suppression effect.Simula⁃tion results verify that under the improved reaching law,the system output dynamic response is faster,the anti-interfer⁃ence capability is strong,and the circulation current is greatly suppressed.
作者
叶佳卓
邓双喜
周宁博
樊承阳
周朝霞
罗盎捷
YE Jiazhuo;DENG Shuangxi;ZHOU Ningbo;FAN Chengyang;ZHOU Chaoxia;LUO Angjie(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Changsha Rail Transit Operation Company,Changsha 410082,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2021年第8期56-61,共6页
Proceedings of the CSU-EPSA
关键词
并联逆变器
环流
滑模控制
新型趋近律
parallel inverter
circulating current
sliding-mode control
novel reaching law
