PARALLEL GS-NSC BASED ON DSVPWM FOR PMSG WIND POWER SYSTEM

Wang Mengtao; Ren Yongfeng; Wu Sengaole; Qian Zhiyong

doi:10.19912/j.0254-0096.tynxb.2021-0459

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (11) : 277-284. DOI: 10.19912/j.0254-0096.tynxb.2021-0459

PARALLEL GS-NSC BASED ON DSVPWM FOR PMSG WIND POWER SYSTEM

Wang Mengtao¹, Ren Yongfeng¹, Wu Sengaole², Qian Zhiyong¹

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Abstract

In order to improve the utilization of the DC side voltage of the nine-switch converter and reduce the switching loss, a discontinuous space vector pulse width modulation（DSVPWM） is proposed. At the same time, the nine-switch converter is used in the direct-driven wind turbine with permanent-magnet synchronous generator（PMSG） on the grid side to form a parallel grid-side nine-switch converter（GS-NSC）. Based on the theoretical analysis of the parallel GS-NSC control strategy and fault ride-through scheme, a PMSG parallel GS-NSC simulation model is established, and a variety of power grid voltage fault conditions are designed for simulation research. The results show that the parallel GS-NSC can maintain the sine wave characteristics of the grid current under normal working conditions of the grid voltage. Under the condition of power network voltage plummeting, the parallel GS-NSC can inject reactive current into the grid to assist the recovery of the grid voltage, and reduce the power loss of the unloading circuit by increasing the grid-connected current amplitude and reduce the PMSG's heat dissipation burden. Under the condition of voltage surge, the parallel GS-NSC can dynamically distribute the DC bus voltage to avoid the PMSG from exiting operation due to overvoltage on the DC side.

Key words

wind turbines / electric converters / power quality / discontinuous space vector pulse width modulation / fault ride through

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Wang Mengtao, Ren Yongfeng, Wu Sengaole, Qian Zhiyong. PARALLEL GS-NSC BASED ON DSVPWM FOR PMSG WIND POWER SYSTEM[J]. Acta Energiae Solaris Sinica. 2022, 43(11): 277-284 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0459

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