新式動態電壓恢復器之模組化設計

Novel Design of a Modular Dynamic Voltage

本文旨在研究新型動態電壓恢復之電能轉換技術，本文利用串接型變流模組結構進行輸配電系統電壓驟降補償，包括使用虛功換流模組，並令其專司於虛功率補償；另再利用實功變流模組進行純實功率補償，由於此模組不需輸出虛功率故不會在模組的直流電容上產生大量的漣波電壓，此設計有助於提供電池較佳的使用環境，裨益於電池儲能裝置使用年限之延長。為實際評估本文所提方法的可行性，本文已於實驗室完成一雛形電路，經由實際電路之測試結果驗證所提方法之可行性，而相關研究心得與經驗應可提供電力從業人員進行電力品質研究時之施行及參考。

In this paper, based on the paradigm of the cascade inverter technique, a new approach to control the dynamic voltage restorer will be proposed. In the method, the required series voltage for the sag correction is first decoupled by the vertical and horizontal component referred to the phase of load current. The vertical and horizontal voltage component is then generated and compensated via the different reactive and active power module. In this case, as the super capacitor-aided reactive power module can output a large amount of the compensation power, the proposed system will take full advantages of less real power injection during the DVR operation, mitigating a severe and long duration voltage sag with a significantly smaller energy demand from the cascaded inverter. The method proposed in this paper will be examined under various scenarios. The results help consolidate the feasibility and practicability of the approach for the applications considered.