摘要
在直流微电网中,直流母线电压二阶纹波分量会导致直流负载或直流能源受到干扰,严重时危害整个系统的电能质量。为此,在分析双向DC/DC变换器电压/电流双闭环控制的基础上,设计了直流有源电力滤波器的直流电压纹波控制,提出一种扰动跟踪的电网阻抗快速观测方法,采用二阶滑模控制的超螺旋算法设计了扰动步长的控制率,加快了阻抗系数的观测速度,实现了阻抗系数的快速动态观测,进一步实现了直流有源电力滤波器对所需补偿纹波电流的实时跟踪提取,有效抑制了直流微电网母线电压二阶纹波。最后,搭建了相应的直流微电网测试平台,验证了所提策略的可行性与有效性。
In DC microgrid,the second-order ripple component of the DC bus voltage can cause interference to the DC load or DC energy,and the power quality of the entire system will be endangered in severe cases.For this reason,based on the voltage/current double closed-loop control of bidirectional DC/DC converter,the DC voltage ripple control of DC active power filter is designed.A fast observation method of disturbance tracking power grid impedance is proposed.The control rate of disturbance step size is designed by using the super-twisting algorithm of second-order sliding mode control,which speeds up the observation speed of impedance coefficient and realizes the fast dynamic observation of impedance coefficient.The real-time tracking and extraction of the required compensation ripple current by the DC active power filter is further realized,and the second-order ripple of the bus voltage of the DC microgrid is effectively suppressed.Finally,the corresponding DC microgrid test platform is built to verify the feasibility and effectiveness of the proposed strategy.
作者
张思宇
张国澎
张宏伟
孙新迪
刘永辉
ZHANG Siyu;ZHANG Guopeng;ZHANG Hongwei;SUN Xindi;LIU Yonghui(School of Electrical and Automation,Henan Polytechnic University,Jiaozuo 454000)
出处
《电气工程学报》
CSCD
北大核心
2024年第2期156-162,共7页
Journal of Electrical Engineering
基金
国家自然科学基金(U1804143)
河南省高校基本科研业务专项资金(NSFRF210423)资助项目。
关键词
直流微电网
二阶纹波
扰动跟踪
超螺旋算法
阻抗系数
直流有源电力滤波器
直流电压纹波控制
DC microgrid
second-order ripples
perturbation tracking
super-twisting algorithm
impedance coefficient
DC active power filter
DC voltage ripple control
