Observer-based second-order sliding mode control for grid-connected VSI with LCL-type filter under weak grid
发布时间：2021-07-28
点击次数：
影响因子：3.414
DOI码：10.1016/j.epsr.2020.106270
发表刊物：Electric Power Systems Research
关键字：LCL filter; Poles placement; Weak grids; Sliding mode observer; Second order sliding mode control
摘要：LCL-type grid-connected voltage source inverters (VSI) have been widely used in distributed generation systems. However, due to the inherent LCL resonance, it brings a stability challenge to the control system. To address this issue, a sliding mode observer-based second-order sliding mode control method is proposed to achieve arbitrary poles placement, which can ensure desired resonance damping and dynamic performance even under weak grid operation. With the help of sliding mode observer (SMO), only the grid current and grid voltage are sensed to realize system stable operation and grid synchronization, which reduces the cost of system. To improve the robustness and dynamic response of LCL-filtered grid-connected inverters under weak grid operation, a super-twisting algorithm (STA) second order sliding mode control (SOSMC) is proposed. Due to the existence of grid impedance in weak grid, the sliding surface would drift, which increases the track error of grid current. To solve this problem, an integral term is added to the sliding surface function. The systematic design approach of SOSMC is presented, and the stability of system under the grid impedance uncertainties as well as external disturbances is proved by Lyapunov theory. Simulation results are finally presented to validate the effectiveness of the proposed control strategy.
合写作者：Su, Mei, Wang, Hui*, Tang, Zhongting, Lian, Yuefeng, Zhang, Lei, Shi, Shuqi
第一作者：Guo, Bin
论文类型：期刊论文
论文编号：20200908216676
学科门类：工学
一级学科：电气工程
文献类型：J
卷号：183
ISSN号：03787796
是否译文：否
发表时间：2020-06-01
收录刊物：SCI、EI
附件：