期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 70, 期 11, 页码 11310-11323出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3227268
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)
This article proposes a constant-coupling-effect-based PLL (CCE-PLL) to resolve the synchronization instability caused by strengthened couplings on the grid-connected converter (GCC) through increasing its bandwidth. The couplings on GCC are found to vary along with the PLL bandwidth, jeopardizing system stability. The CCE-PLL is designed with a constant and low coupling regardless of its bandwidth on GCC, separate from its impedance response, and experiments confirm its robustness and performance under grid impedance variation and system disturbances.
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.
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