Comparative Stability Analysis and Improvement of Grid-Following Converters Using Novel Interpretation of Linear Time-Periodic Theory

被引:4
作者
Yang, Huoming [1 ]
Eggers, Malte [1 ]
Teske, Peter [1 ]
Dieckerhoff, Sibylle [1 ]
机构
[1] Tech Univ Berlin, Fak Elekt Tech & Informat 4, Dept Power Elect, D-10623 Berlin, Germany
关键词
Eigenvalues and eigenfunctions; Phase locked loops; Power system stability; Linear systems; Harmonic analysis; Computational modeling; Analytical models; Dual second-order generalized integrator phase-locked loop (DSOGI-PLL); dual synchronous reference frame (DSRF)-PLL; grid-following (GFL) converter; linear time-periodic (LTP) theory; small-signal stability; INVERTERS; SYSTEMS; PLL;
D O I
10.1109/JESTPE.2022.3194411
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This article presents a comparative stability investigation of grid-following (GFL) converters with different advanced phase-locked loops (PLLs) and current control schemes based on linear time-periodic (LTP) theory. First, a time-domain physical interpretation of the LTP theory is proposed, which inspires an iterative LTP eigenvalue computation algorithm. A measure for the influence of the frequency coupling effect on each eigenvalue is defined to demonstrate the necessity of applying the LTP theory. Then, eigenvalue-based stability analysis is carried out to gain insights into dynamic characteristics of two implementations of GFL converters, namely, dual synchronous reference frame PLL (DSRF-PLL) and proportional integral (PI) current control, and dual second-order generalized integrator PLL (DSOGI-PLL) and proportional resonant (PR) current control. The effects of the PLL bandwidth, the current control time constant, the grid strength, and imbalance on the system stability are evaluated. In addition, a damping loop is proposed to improve the stability margin of GFL converters connected to weak grids. Finally, MATLAB/Simulink simulations and experimental measurements validate the correctness of the proposed modeling method and stability assessment results.
引用
收藏
页码:7049 / 7061
页数:13
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