SUB-SYNCHRONOUS OSCILLATION SUPPRESSION STRATEGY FOR DIRECT DRIVE WIND FARM BASED ON SLIDING MODE CONTROL

Wang Gang; Gao Benfeng; Wang Xiao; Zhang Liwei; Ding Yuqing

doi:10.19912/j.0254-0096.tynxb.2021-1557

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 163-172. DOI: 10.19912/j.0254-0096.tynxb.2021-1557

SUB-SYNCHRONOUS OSCILLATION SUPPRESSION STRATEGY FOR DIRECT DRIVE WIND FARM BASED ON SLIDING MODE CONTROL

Wang Gang^1,2, Gao Benfeng^1,2, Wang Xiao^1,2, Zhang Liwei¹, Ding Yuqing^1,2

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Abstract

When the direct drive wind farm（DDWF） incorporates into weak AC system, the sub-synchronous oscillation（SSO） may occur. At this time, the PI controller in the inner current loop of the grid side converter（GSC） may amplify the sub-synchronous current component contained in the gird-connected current of DDWF. Then, a sub-synchronous current positive feedback loop composed of AC system,GSC and its control system is formed to leads to the instability of the system eventually. To solve this issue, the SSO suppression strategy of DDWF based on the sliding mode control（SMC） in the inner current loop of GSC is proposed. Firstly, the dynamic model of DDWF connected to weak AC system is established,and the SSO formation mechanism of DDWF connected to weak AC system dominated by PI controller is deduced. In order to cut off the positive feedback loop of the system sub-synchronous current, the SMC controller based on exponential reaching law is designed,and the SMC controller is used to replace the PI controller in the original inner current loop of GSC. Through the theoretical derivation,it is proved that the SMC controller in inner current loop of GSC can effectively suppress the SSO of the system. Finally, the simulation examples of DDWF connected to weak AC system in PSCAD/EMTDC verify the effectiveness of the proposed SSO suppression strategy.

Key words

sliding mode control（SMC） / sub-synchronous oscillation（SSO） / direct drive wind farm（DDWF） / grid side converter（GSC） / inner current loop

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Wang Gang, Gao Benfeng, Wang Xiao, Zhang Liwei, Ding Yuqing. SUB-SYNCHRONOUS OSCILLATION SUPPRESSION STRATEGY FOR DIRECT DRIVE WIND FARM BASED ON SLIDING MODE CONTROL[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 163-172 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1557

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