CONTROL TECHNOLOGY OF PV-VSG BASED ON SLIDING MODE VARIABLE POWER TRACKING

Jiang Lin; Qing Jianru; Han Lu; Dai Yunzhong; Li Pingyuan; Zuo Jiaming

doi:10.19912/j.0254-0096.tynxb.2020-0435

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 193-199. DOI: 10.19912/j.0254-0096.tynxb.2020-0435

CONTROL TECHNOLOGY OF PV-VSG BASED ON SLIDING MODE VARIABLE POWER TRACKING

Jiang Lin, Qing Jianru, Han Lu, Dai Yunzhong, Li Pingyuan, Zuo Jiaming

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Abstract

Aiming at the problem that the traditional photovoltaic virtual synchronous generator （PV-VSG） with energy storage device not only has high investment cost, but also does not consider the output characteristics of photovoltaic array, a PV-VSG control strategy based on sliding mode variable power point tracking （SM-VPT） is proposed. Based on the sliding mode control, the DC bus voltage deviation control is introduced to adjust the power tracking trajectory of photovoltaic arrays, so as to realize the photovoltaic output adaptively matching the load demand. That is, when the photovoltaic capacity is sufficient, only the power matching the load is provided; when the photovoltaic power is insufficient, traditional maximum power point tracking （MPPT） control can be implemented to reduce power shortage, meanwhile, the DC voltage sag can be prevented to ensure the stable operation of the system. This method enables the PV-VSG to supply power to the load on demand without additional energy storage equipment, and realizes the photovoltaic generation system directly connected to the grid in the form of VSG. The simulation results verify the effectiveness of the proposed control method.

Key words

virtual synchronous generator / photovoltaic / energy storage / sliding mode control / variable power tracking / power matching

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Jiang Lin, Qing Jianru, Han Lu, Dai Yunzhong, Li Pingyuan, Zuo Jiaming. CONTROL TECHNOLOGY OF PV-VSG BASED ON SLIDING MODE VARIABLE POWER TRACKING[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 193-199 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0435

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