直驱风电场并网对火电机组次同步谐振影响

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Abstract

After the direct-drive wind farm (D-DWF) is connected to the thermal power through series replenishment system, its influence mechanism on the subsynchronous resonance (SSR) of the thermal power unit is not clear. In this paper, a modular coupling small signal model is established by using the method of state variable eliminationfor modular modeling for the wind-thermal bundled and series complement point pair grid system.The SSR situation of the D-DWF system after D-DWF access is studied by eigenvalue analysis. The SSR mechanism is explained by combining the eigenvalue analysis results, and the damping analysis is carried out for D-DWF and series complement line parameters. The results show that D-DWF introduces a new mode that is close to the SSR frequency and causes "resonance", so that the oscillation mechanism of "electromechanical resonance" and "modal frequency close" can be coupled and coexisted. Under the control strategy and parameters of the grid-following wind turbine, the incorporation of D-DWF will lead to a significant reduction in SSR modal damping and worsen the SSR of the system. As the capacity, wind speed, and system string complement of the D-DWF decrease, the system damping will increase and the risk of SSR will decrease. The electromagnetic transient simulation based on the PSCAD/EMTDC platform verifies the correctness of the mechanism analysis.

Key words： direct-drive wind farm series compensation wind-thermal bundled eigenvalue analysis SSR

Received: 22 March 2023

PACS:

TM712

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	Articles by authors
	Gao Benfeng
	Liu Peixin
	Liu Wangfeng
	Dong Liangyuan
	Zhang Rui

Cite this article:

Gao Benfeng,Liu Peixin,Liu Wangfeng等. Influence of Grid-connected Direct-Drive Wind Farm on Subsynchronous Resonance of Thermal Power Units[J]. Transactions of China Electrotechnical Society, 0, (): 8927-.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/8927

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