本研究室提出一套適用於家庭的混合能源微電網控制系統，包含雙向換流器、雙向直流/直流轉換器以及太陽能最大功率追蹤轉換器，而本研究將著重於雙向直流/直流轉換器之研製。在此轉換器中，前級諧振轉換器提供高壓側與低壓側間的電氣隔離，並利用諧振特性使開關達到軟切換；後級雙向降壓型轉換器可提高降壓比的自由度。在控制方面採用分切合整數位控制法則(D-Σ digital control)，此控制法則允許寬廣感值變化，電感電流能精準追蹤電流命令，達到定電流充/放電與穩壓功能。
本論文主要貢獻為：將隔離型雙向直流/直流轉換器應用於混合能源微電網控制系統中，並於此轉換器中採用分切合整數位控制，達到系統所需之定電流充/放電與穩壓功能。最後本研究實現一部額定功率2 kW，輸入電壓380 ± 20 V，輸出電壓48 ± 6 V之隔離型雙向直流/直流轉換器，此轉換器於滿載2 kW時之實測效率可達到93.9%。將其搭配雙向換流器以及太陽能最大功率追蹤轉換器整合測試，以驗證應用於混合能源微電網控制系統之可行性。

A hybrid energy control system of a microgrid was proposed in our lab. It includes a bi-directional inverter, bi-directional dc/dc converter and maximum power point tracking converter connected through a common DC-bus. The main focus of this study is on design and implementation of an isolated bi-directional dc/dc converter, which consists of two converter stages connected in cascade. The first stage is a bi-directional full-bridge LLC resonant converter which can achieve ZVS with the resonance characteristics of the LLC, and its transformer can provide galvanic isolation. The second stage is a bi-directional buck converter which can improve the degree of freedom in tuning step-down and step-up ratio. With the division-summation (D-Σ) digital control, the second stage converter is allowed to have wide inductance variation due to the magnetic permeability of the core varying with inductor current. It can track current reference precisely and achieve constant current charging/discharging of the battery.
The major contribution of this paper is that this research adopts an isolated bi-directional dc/dc converter in a hybrid energy control system. It applies the D-Σ digital control to the converter to achieve constant current charging/discharging and DC-bus voltage regulation. A 2 kW isolated bi-directional dc/dc converter prototype with input voltage 380 ± 20 V and output voltage 48 ± 6 V has been implemented. The efficiency can reach 93.9% under full load condition. The bi-directional dc/dc converter can be combined with a bi-directional inverter and a maximum power point tracker to verify the feasibility of the hybrid energy control system.

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