MODELING AND CONTROLLER DESIGN OF THREE-LEVEL BUCK-BOOST CONVERTER ADAPTED TO DC NEW ENERGY AND ENERGY STORAGE ACCESS

Luan Siping; Su Shi; Yang Zhou; Zhu Zhen; Yan Gefei; Ma Fujun

doi:10.19912/j.0254-0096.tynxb.2021-0252

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (4) : 56-65. DOI: 10.19912/j.0254-0096.tynxb.2021-0252

Topics on Key Technologies for Safety of Electrochemical Energy Storage Systems and Echelon Utilization of Decommissioned Power Batteries

MODELING AND CONTROLLER DESIGN OF THREE-LEVEL BUCK-BOOST CONVERTER ADAPTED TO DC NEW ENERGY AND ENERGY STORAGE ACCESS

Luan Siping¹, Su Shi¹, Yang Zhou², Zhu Zhen³, Yan Gefei³, Ma Fujun³

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Abstract

In order to solve the access of new energy generation/energy storage devices, in this paper a cascaded three-level Buck-Boost converter is taken as the research object. The topology can achieve the access of new energy generation/energy storage devices with high power and wide range of input voltage. Firstly, the working principle of cascaded three-level buck-boost converter is analyzed. Based on the charging and discharging of energy storage devices, there are two operating modes： Buck mode and Boost mode, and the small-signal average model of cascaded three-level buck-boost chopper is deduced respectively. Secondly, considering the midpoint voltage balance problem, the influence of the duty-cycle difference ΔD on the system is analyzed, and through the Bode diagram, it is concluded that the influence of ΔD is great only in the low frequency band of Boost mode, but not in the high frequency band of Buck mode and Boost mode. Then, according to the small signal model of the system, the controller is designed, and the differences between the PI controller and the TypeⅢ controller are compared. It is concluded that the TypeⅢ controller has greater control bandwidth and stability. Finally, the effect and characteristics of two controllers are verified by simulation.

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new energy/energy storage access / three-level DC converter / working principle / small signal / controller design

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Luan Siping, Su Shi, Yang Zhou, Zhu Zhen, Yan Gefei, Ma Fujun. MODELING AND CONTROLLER DESIGN OF THREE-LEVEL BUCK-BOOST CONVERTER ADAPTED TO DC NEW ENERGY AND ENERGY STORAGE ACCESS[J]. Acta Energiae Solaris Sinica. 2022, 43(4): 56-65 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0252

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