PDF
Full
Outline
The traditional phase-locked loops (PLLs) in a VSC-HVDC system such as a synchronous reference frame PLL (SRF-PLL) and a dual second-order generalized integrator PLL (DSOGI-PLL) cannot accurately track the positive-sequence voltage phase of grid fundamental wave under non-ideal power grid, which will cause different degrees of phase-locked error, affect the control performance of VSC and reduce the system stability. To solve this problem, an improved DSOGI-PLL scheme is proposed. First, the attenuation characteristics of SOGI-QSG at different frequencies are analyzed according to the Bode diagram, and the limitations of DSOGI-PLL applications are obtained. Then, based on the voltage of harmonic grid, the internal model of repetitive control is introduced on the basis of DSOGI to realize the real-time tracking and regulation of harmonic signals, thus suppressing the harmonic voltage interference. At the same time, considering the DC bias and voltage frequency fluctuation of power grid, a method of DC bias elimination and frequency adaptation is proposed to realize the adaptive phase tracking of power grid. Finally, the superiority of the proposed strategy was verified through a comparison between the simulation and experimental results.
PDF
367
151
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
