- 學位論文
以數位訊號處理器建構具有雙向能量流動之電池測試系統
A DSP-based Battery Test System with Bi-directional Power Flow Control
摘要
本文主要是建構具有雙向能量流動之電池測試系統，不僅可對二次電池提供定電流與定電壓充電模式外，更可對電池進行電流放電測試並將電池釋放之將能量回送至電網，達到節能之效果。為有效提高系統抗雜訊能力與實現控制策略，因此使用一只數位訊號處理器做為控制核心。所提系統是以兩級轉換器串接所建構，由單相全橋電路做為雙向交流-直流轉換器與市電接軌並提供高壓直流電源，並具有主動功率因素修正功能，可有效降低交流側之電流諧波與提高用電效能。隨後，以具電氣隔離之直流-直流轉換器對高壓側與低壓之電池間進行能量轉換。當在充電模式時是以半橋之架構將高壓側之能量轉換至為低壓，並施以同步整流以提高效率；當電池於放電測試時，則以電流饋入推挽之架構以電流控制模式將電池能量傳遞至高壓側。 為建構完整之分析與設計環境，使用IsSpice建立電路模型，以做為控制策略設計之參考。最後，以數位訊號處理器(TMS320F28035)建構交流電壓為110Vrms/60Hz，電池端直流電壓為48V，雙向輸出功率為500W之電池測試系統。並以實驗證明系統具有良好之性能。
並列摘要
The object of this thesis is implementation of a bi-directional power flow battery test system. The system not only provides constant voltage and constant current charging mode for the rechargeable battery, but also sends battery energy to power grid to achieve energy saving in discharge mode. In order to improve the capability of noise rejection and realize control strategies, a digital signal processor is used as control kernel. The proposed system includes two stages in cascade. The front end is a single-phase bi-directional full-bridge AC-DC converter which is connected to power grid to provide high voltage DC power. Meanwhile, the AC-DC converter makes near unity factor control to enhance efficiency and reduce line current harmonics. Then an isolated DC-DC converter is yielded the power flow control between battery and high-side DC voltage of the AC-DC converter. When the battery is under charging mode, the half-bridge circuit is used to transfer high-side DC voltage to low-side DC voltage through synchronous rectified operation. On the other hand, the discharging energy of battery is forced into high-side DC voltage by a current-fed push-pull circuit. In order to facilitate the studies performed in this thesis. A DSP-based converter with necessary peripherals is established to provide 110V/60Hz/single phase input and 1kW/48V output. After establishing the converter, some measured results on Li-ion battery for electrical scooter are provided to show its successful operation and effectiveness. A simulation model based on IsSpice is carried out to make the analysis and design of control strategies more easier. Finally, a DSP-based battery test system with 110Vrms/60Hz and 48V DC/500W is constructed. Some measured results are provided to show its good performance.