Constant-Coupling-Effect-Based PLL for Synchronization Stability Enhancement of Grid-Connected Converter Under Weak Grids

被引:67
作者
Lin, Xianfu [1 ,2 ]
Yu, Ruoxue [3 ]
Yu, Jingrong [4 ]
Wen, He [1 ,2 ]
机构
[1] Hunan Univ, Coll Elect & Informat Engn, Changsha 410012, Peoples R China
[2] Hunan Prov Key Lab Intelligent Elect Measurement, Changsha 410012, Peoples R China
[3] Changsha Elect Power Tech Coll, Dept Power Supply Serv, Changsha 410131, Peoples R China
[4] Cent South Univ, Sch Automat, Hunan Prov Key Lab Power Elect Equipment & Grid, Changsha 410017, Peoples R China
基金
中国国家自然科学基金;
关键词
Phase locked loops; Impedance; Control systems; Couplings; Bandwidth; Synchronization; Power system stability; Constant coupling effect (CCE); grid-connected converter (GCC); grid impedance; phase-locked loop (PLL); COMPENSATION; SYSTEM;
D O I
10.1109/TIE.2022.3227268
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
The phase-locked loop (PLL)-caused couplings on the grid-connected converter (GCC) are strengthened by increasing its bandwidth and then incur synchronization instability. This article proposes a constant-coupling-effect-based PLL (CCE-PLL) to resolve the aforementioned issues. Initially, the feature of the PLL-caused couplings on GCC is explored. It exhibits that the couplings are varied along with the PLL bandwidth hence jeopardizing the system's stability. Subsequently, the CCE-PLL with a constant and low coupling regardless of its bandwidth on the GCC is proposed. It illustrates that the CCE-PLL bandwidth does not influence the GCC's impedance response, bringing the GCC and CCE-PLL can be designed separately. Last, the experiments confirm that using CCE-PLL, the system has high robustness against grid impedance variation, and the GCC is capable of injecting/absorbing 1.0 per unit active power in a very weak grid. Moreover, the system attains good anti-interference ability and transient performance under system disturbances thanks to the permission usage of the high CCE-PLL bandwidth.
引用
收藏
页码:11310 / 11323
页数:14
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