STUDY ON PERFORMANCE OF PHOTOVOLTAIC COLD STORAGE BASED ON CONTROL OF DYNAMIC IMPEDANCE MATCHING

Zhou Xiaoyan; Ma Xun; Li Ming; Hu Chengzhi; Li Guoliang; Wang Yunfeng

doi:10.19912/j.0254-0096.tynxb.2020-0594

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (3) : 180-187. DOI: 10.19912/j.0254-0096.tynxb.2020-0594

STUDY ON PERFORMANCE OF PHOTOVOLTAIC COLD STORAGE BASED ON CONTROL OF DYNAMIC IMPEDANCE MATCHING

Zhou Xiaoyan¹, Ma Xun², Li Ming², Hu Chengzhi², Li Guoliang², Wang Yunfeng²

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Abstract

To ensure the operational performance of photovoltaic （PV） refrigeration,a dynamic equivalent impedance matching （DEIM） control strategy is presented in the paper for off-grid PV cold storage. Impedance converters are used to match PV generation and load by adjusting different duty cycles with pulse width modulation （PWM）. In addition, the paper presents a model of the maximum power point （MPP） equivalent impedance for the PV system, which is influenced by temperature, irradiance, and the equivalent impedance of MPP under the standard test conditions （STC）. Accordingly, a 5.4 kW direct-driven cold storage with distributed PV system is established based on the theory and the controlling strategy. The results indicate that the DEIM can significantly reduce the impact of solar radiation fluctuation on PV cold storage systems. Compared to the condition with traditional strategy, the novel methods presented by the paper improve the values of PV modules conversion efficiency,the production quantity of ice, and the rate of refrigeration system utilization increased by 41.0%, 64.1%,and 63.5%,respectively. In addition, the paper will be a reference that provides a theoretical analysis and optimization for PV cold storage system control.

Key words

photovoltaic arrays / pulse width modulation / maximum power point / dynamic impedance matching / cold storage

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Zhou Xiaoyan, Ma Xun, Li Ming, Hu Chengzhi, Li Guoliang, Wang Yunfeng. STUDY ON PERFORMANCE OF PHOTOVOLTAIC COLD STORAGE BASED ON CONTROL OF DYNAMIC IMPEDANCE MATCHING[J]. Acta Energiae Solaris Sinica. 2022, 43(3): 180-187 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0594

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