期刊
IEEE TRANSACTIONS ON ENERGY CONVERSION
卷 36, 期 4, 页码 3449-3461出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2021.3074798
关键词
Mathematical model; Impedance; Wind farms; Oscillators; Power system stability; Couplings; Integrated circuit modeling; PMSG-based wind energy conversion system; machine-side system; impedance modeling; MMC-HVDC; stability analysis
资金
- National Natural Science Foundation of China [51907125]
- Power Electronics Science and Education Development Program of Delta Group [DREG2020010]
Impedance modeling of a PMSG-based WECS usually simplifies the machine-side dynamics as a constant power source, assuming decoupling with the grid-side dynamics due to a large dc-bus capacitor. However, in practice, this simplification may not hold true as minimizing the capacitor size affects the decoupling.
Impedance modeling of a permanent magnet synchronous generator (PMSG)-based wind energy conversion system (WECS) usually ignores the machine-side dynamics, instead, the machine-side system is simplified as a constant power source, while merely keeping the detailed grid-side converter model. This simplification is mainly based upon the intuition that the dc-bus capacitor is large enough so that the machine- and grid-side dynamics can be decoupled. However, the simplification probably does not hold in practice since there is always a tendency to minimize the capacitor size to achieve a smaller package for installation. Therefore, the machine-side system should not be ignored, otherwise maybe leading to error for stability analysis. To address this issue, this paper developed a complete ac-side impedance model of the PMSG-based WECS. Then, impact factors about the coupling characteristics between machine- and grid-side systems of the PMSG-based WECS are discussed. Finally, a case study of sub/super synchronous oscillation is carried out on a practical offshore wind farm integrated with a modular multilevel converter based high-voltage dc (MMC-HVDC) transmission system in China. The results show that ignoring the machine-side system would lead to an optimistic stability judgement, which confirms the necessity of the complete model of PMSG-based WECS. Furthermore, the system can be stabilized by either changing the couplings between machine- and grid-side systems of PMSG-based WECS or implementing active damping in the wind farm side MMC.
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