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YANG Runan,HE Jinwei,WANG Xiurui.Research on Model Predictive Control of Voltage of Three-level Bi-directional DC-DC Converter[J].JOURNAL OF POWER SUPPLY,2021,19(2):74-80

Research on Model Predictive Control of Voltage of Three-level Bi-directional DC-DC Converter

Received:December 05, 2019 Revised:March 01, 2021

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DOI：10.13234/j.issn.2095-2805.2021.2.74

Keywords:three-level bi-directional DC-DC converter model predictive control (MPC) bi-directional control neutral-point voltage balance

Fund Project:Project Supported by Research on Hierarchical Coordination Control and Electricity Price Settlement Mechanism of Renewable Energy microgrid

　　　　　　

Author	Institution	Email
YANG Runan	School of Electrical and Information Engineering, Tianjin University, Tianjin , China
HE Jinwei	School of Electrical and Information Engineering, Tianjin University, Tianjin , China	18202539408@163.com
WANG Xiurui	School of Electrical and Information Engineering, Tianjin University, Tianjin , China

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Abstract:

Owing to its advantages such as a high transmission efficiency and small output waveform distortion, the three-level bi-directional DC-DC converter has been widely applied to energy storage systems and other low-voltage and high-current scenarios. However, due to the increase in the number of output levels and the growing modulation complexity, the problem of neutral-point voltage imbalance may occur in its applications. To solve this problem, a model predictive control (MPC) method is proposed to implement the multi-objective optimization control of the voltage of DC bus and that of the voltage-dividing capacitor on the output side. This method realizes the control of the three-level bi-directional DC-DC converter in two steps, i.e., the construction of a prediction model and the optimization of the objective function. As a result, the accuracy and response speed of DC bus voltage regulation are improved while restraining the neutral-point voltage fluctuations. Finally, the proposed strategy is applied to an energy-storage system, and simulations are carried out using Matlab/Simulink. Results validate the effectiveness of the proposed algorithm in the tracking of DC bus voltage and the control of neutral-point voltage balance.