主動箝位順向式換流器研製

Research and Implementation of an Active-Clamp Forward Inverter

吳彥霆(Yan-Ting Wu)

指導教授 ： 張健軒

義守大學/電機資訊學院/電機工程學系/碩士(2019年)

摘要

本文所提出之主動箝位順向式換流器，採用主動箝位順向式直流-直流轉換器(Active-Clamp Forward DC-DC Converter)搭配低頻切換之全橋展開電路，以實現交流輸出。由於換流器之變壓器工作在一、三象限，使鐵芯的體積減小與成本降低。變壓器的能量重置則是藉由副開關與共振元件來達成，可以有效解決責務比的限制與主開關上過高的電壓應力，以減少換流器之成本。加上藉由共振元件與主、副開關，達成主、副開關之零電壓切換(ZVS)特性，可以有效的減少開關上的切換損失。並以dsPIC30F4011作為控制核心，提供主、副開關之互補SPWM控制訊號與簡化開關驅動電路之複雜度。最後，針對所提之主動箝位順向式換流器製作150W的雛型電路，以電腦模擬結果與實驗量測交互比對，來驗證所提之理論分析的正確性與可行性。

關鍵字

順向式轉換器 ； 主動箝位電路 ； 全橋展開電路 ； 換流器

並列摘要

This thesis proposes an active-clamp forward inverter. The proposed inverter is developed with an active-clamp forward dc-dc converter, and then connecting with an H-bridge unfolding circuit to output low-frequency voltage. Because the transformer works in the first and third quadrants, it can reduce the volume of the core and the cost. This inverter solves the limitation of duty ratio and the voltage stress on the main switch by resting the flux of transformer wih the auxiliary switch and the clamp capacitor. The zero voltage switching (ZVS) is achieved by the resonant elements, the main switch and auxiliary switch. The zero voltage switching (ZVS) can effectively reduce the switching loss. The system uses the digital signal processor dsPIC30F4011, providing multiple sets of SPWM control signals, simplifying circuit complexity. Finally, a 150W prototype circuit is fabricated for the active-clamp forward inverter. The simulated and experimental results are measured to verify the correctness and feasibility of the proposed inverter.

並列關鍵字

Forward converter ； H-bridge unfolding circuit ； Active-Clamp circuit ； Inverter

參考文獻

[1] Zhirong Zeng, Hao Yi, Feng Wang, Fang Zhuo, and Zhenxiong Wang, “A novel control strategy of photovoltaic power fluctuations and suppressing the low frequency oscillations of power system,” 2016 IEEE 8th International Power Electronics and Motion Control Conference, May. 2016.

[2] Liming Liu, Hui Li, Yaosuo Xue, and Wenxin Liu, “Reactive power compensation and optimization strategy for grid-interactive cascaded photovoltaic system,” IEEE Transactions on Power Electronics., vol. 30, no. 1, Jan. 2015.

[3] Yuan Bo, Yang Xu, and Li Donghao, “Application of power compensating concept for high efficiency maximum power point tracking in grid-conneted photovoltaic system,” The 2010 International Power Electronics Conference, June. 2010.

[4] Wang Yi-Bo, Wu Chun-sheng, Liao Hua, and Xu Hong-Hua, “Steady-state model and power flow analysis of grid-connected photovoltaic power system,” 2008 IEEE International Conference on Industrial Technology, April. 2008.

[5] Xiaohong Guan, Zhanbo Xu, and Qing-Shan Jia, “Energy-efficient buildings facilitated by microgrid,” IEEE Transactions on Smart Grid., vol. 1, no. 3, Dec. 2010.