主動箝位電流饋入型雙主動橋式轉換器之雙向控制策略

Bidirectional Control Strategy for Active-clamp Current-fed Dual Active Bridge Converters

葉昶均(Chang-Chun Yeh)

指導教授 ： 陳耀銘

國立臺灣大學/電機資訊學院/電機工程學研究所/碩士(2022年)

https://doi.org/10.6342/NTU202202177

摘要

本論文提出一個適用於主動箝位電流饋入型雙主動橋式轉換器(Active-clamped current-fed dual active bridge, AC-CFDAB)的雙向控制策略，透過雙重相位移的控制實現雙向能量傳輸，並擁有比現行調變方式更好的換向暫態，同時也可以讓電路操作在當前輸出功率下的最大效率點。
AC-CFDAB的低壓側漣波小且可以達到雙向能量傳輸，非常適合用於電池儲能應用於低壓側電源的場合。然而，現階段對於實現軟切換的開關調變方法研究多只適用於單向的能量傳輸，雙向操作需要涉及兩個不同控制方法的轉換，若是兩個控制方式差異過大，換向瞬間的暫態突波會十分明顯，嚴重時會損壞整體電路。
本文首先提出一個可以實現雙向能量傳輸的修改型雙重相位移的開關調變方式，由於在雙向操作時並不需要變換調變方式，可以大幅降低改變功率流向操作時的暫態突波。同時只要設定足夠的停滯時間，全部的開關都可以實現零電壓切換。此外，雙重相位移也提供更高的控制自由度，除了傳輸能量之外，轉換效率也有機會被提升。本論文透過對雙重相位移的解耦合與相關分析，提出可以達到最大效率操作點的雙向控制策略。
為了驗證所提控制策略的正確性，本論文實作一組48V/400V, 720W的原型電路。電腦模擬與實驗結果皆符合驗證所提控制策略的正確性。

關鍵字

主動箝位電流饋入型雙主動橋式轉換器 ； 雙重相位移控制 ； 零電壓切換 ； 最大效率追蹤

並列摘要

This thesis proposes a bidirectional control strategy for the active-clamped current-fed dual active bridge(AC-CFDAB) converter. By controlling the dual phase-shifts, the bidirectional power transmission can be achieved, the bidirectional transient is better than conventional modulation methods, and the maximum efficiency point can be tracked.
The AC-CFDAB converter has the small low-voltage-side current ripple and the ability of bidirectional power transmission, which is very suitable for energy storage applications. However, research of soft switching modulation method listed in literature only focus on the unidirectional power transmission. Two different modulation methods are required to achieve the bidirectional power transmission. Usually, an obvious current spike will be generated during the transition of the two modulation mothods. In the worst case, the converter may be damaged.
This thesis first proposes a modified dual-phase-shift modulation(MDPSM) method for the bidirectional operation of the AC-CFDAB. Since there is no change of the modulation method for MDPSM, the current spike of the bidirectional operation transient can be mitigated dramatically. Also, the zero-voltage-switching feature for all the switches can be achieved by adding the proper deadtime. Additionally, the control of dual-phase-shift provides an additional degree of freedom to control, so that improve the efficiency of the converter. In this thesis, the proposed MDPSM is used to realize the maximum efficiency tracking of the converter.
To validated the performance of the proposed MSPSM modhod, a 48V/400V, 720W AC-CFDAB prototype is built and tested. Computer simulations and experiment results are provided to the performance of the AC-CFDAB with the proposed MDPSM method.

並列關鍵字

dual active bridge converter ； daul-phase-shift control ； zero voltage switching ； maximum efficiency point tracking

參考文獻

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