相較於其他發電方式，再生能源雖然有著永續與環境友善等優點，但其發電量無法持續地穩定供給，因此本研究採用的混合供電之再生能源發電備援系統。藉由電流饋入式全橋隔離型轉換器控制燃料電池的輸出功率，提供微電網穩定的基載能源，並且藉由雙主動式全橋相位移雙向轉換器控制鉛酸蓄電池的雙向功率流動，維持發電端與負載端之供需平衡。然由於蓄電池主要擔任緩衝能量的角色，若基載能源-燃料電池提供的能量與備載需求相差甚遠，在有限的電池容量下將導致蓄電池的工作時間大幅降低，本文因此提出燃料電池與鉛酸蓄電池的功率分配策略來設定燃料電池的輸出功率，以降低蓄電池的負荷。本文並提出直流匯流排能量管理機制，協調蓄電池的輸出功率以維持發電與負載之間的功率平衡；另一方面，利用鉛酸蓄電池充電狀態(state of charge, SOC)的調節機制，避免蓄電池深度充放電。本研究透過CAN-Bus通訊介面整合控制450W之基載燃料電池系統及1.5kW之儲能電池系統，經由模擬及實測驗證本文所提及能量管理控制的可行性。

Compared with other power generation forms, most renewable energy resources are hard to supply stable power even though they are more sustainable and environmental friendly. Therefore, a hybrid backup supply system is proposed to amend this problem. Interfacing the microgrid with current-fed full-bridge isolated DC-DC converter, fuel cell can provide stable backup power for microgrid. Interfacing with the dual-active-bridge bidirectional DC-DC converter, lead-acid battery can control the bidirectional power flow to balance power source and demand. However, the working time of the battery might be reduced due to the limited battery capacity. For this reason, this thesis proposes a power distribution strategy to set output power of the fuel cell for reducing the battery burden. Furthermore, DC-Bus management scheme is employed to control battery output power for balancing generation and demand. Moreover, a state of charge (SOC) regulation scheme is proposed to prevent battery from overcharging or overdischarging. A 450W base-load fuel cell with a 1.5kW lead-acid battery are integrated for the control test. Simulation and experimental results validate the effectiveness of the energy management control and strategy.
SUMMARY
This thesis proposes an energy management strategy for a hybrid power supply system which includes a backup supply in the distributed renewable generation system. The hybrid power system is composed of a 500W proton exchange membrane fuel cell and a series of seven 40Ah lead-acid battery bank. Interfacing the microgrid with current-fed full-bridge isolated DC-DC converter, fuel cell can provide stable and controllable backup power for microgrid. Interfacing with the dual-active-bridge bidirectional DC-DC converter, lead-acid batteries can control the bidirectional power flow with DC-Bus. As a main energy source, the fuel cell must provide most of backup supply power for reducing the battery burden. For this reason, this thesis proposes a power distribution strategy to set the fuel cell output power. On the other hand, the battery bank has to compensate the dynamic energy variation. Therefore, DC-Bus management scheme is employed to control battery output power for balancing generation and demand. Moreover, a state of charge (SOC) regulation scheme is proposed to prevent battery from overcharging or overdischarging. Finally, a 450W base-load fuel cell system with a 1.5kW lead-acid battery storage system are integrated for the control test.

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