Optimal Control for the Full-Bridge Three-Level DC-DC Converter

被引：0

作者：

Li W. ^{[1
]}

Wang H. ^{[1
]}

Huang S. ^{[1
]}

Wu X. ^{[1
]}

机构：

[1] Institute of Electrical and Information Engineering, Hunan University, Changsha

来源：

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2021年 / 36卷 / 16期

关键词：

Full-bridge three-level DC-DC converter; HVDC; Optimal control; Voltages control of the divided capacitors;

D O I：

10.19595/j.cnki.1000-6753.tces.200535

中图分类号：

学科分类号：

摘要：

In this paper, an optimal control strategy was proposed according to the problems of the full-bridge three level (FBTL) DC-DC converter, such as coordinated control of two duty cycles, small output power of the FBTL DC-DC converter and voltage balance of divided capacitors. First, the characteristics of the FBTL DC-DC converter was analyzed in detail and a self-balance modulation scheme for divided capacitor voltage was investigated. Second, a strategy to resist the voltage disturbance of the divided capacitor was proposed. At the same time, a restraint condition for the duty cycles was investigated. Third, taking the harmonics of the transformer input voltage as the objective, and taking the power of the FBTL DC-DC converter and the voltage regulation capacity of the divided capacitor as the constraints, an optimization model for the duty cycles was established. The optimal duty cycles were calculated ofﬂine and stored in the digital control system. The look-up table method was adopted to get the optimal duty cycles. The proposed method does not require an accurate model of the converter, and the control process is simple and efficient. Finally, a FBTL DC-DC converter model in Matlab/Simuink and a FBTL DC-DC converter experimental prototype were built to verify the theoretical analysis. © 2021, Electrical Technology Press Co. Ltd. All right reserved.

引用

页码：3342 / 3353

页数：11

共 34 条

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