摘要
變頻器現已普遍用於產業界，但在電力系統突然停電或電壓驟降時，變頻器所控制的馬達仍不免會降速或停止運轉，如此對如半導體製造業等精密科技的產業，會造成嚴重經濟損失。故本研究嘗試設計一低成本、可靠及可提供電力備援的直流供電系統，直接與變頻器的直流匯流排並聯，在電力系統有壓降的瞬間，幾乎無時間差的提供電力備援，讓變頻器可再運轉三分鐘以上，因此在等待工廠的緊急發電機起動及並聯的三分鐘內，馬達仍能穩定的運轉。此系統包括鉛酸電池組、充放電控制電路、變頻器控制電路修改與參數設定等，經妥善的設計與製作，再將所開發的系統與一變頻器實際的並聯，用以驅動一和管路系統連結的水幫浦，並經模擬各種電源斷電的模式，驗證此系統皆能持續地使變頻器與馬達穩定運轉，達成設計的目的。
並列摘要
Inverters are now prevailing in the industries. However, when the electricity happens to be interrupted or surges in its voltage, inverters and the motors they controlled will be unavoidable reducing their speed or coming to a stop. Such phenomena will certainly induce much pecuniary loss especially for the industries with precision technology, likes semiconductor manufacturing. This situation motivates us to perform the research creating a low cost and reliable DC power back up system. The system is designed to connect the DC bus of the inverter in parallel such that, in the moment of power failure, it will supply its electricity to the inverter without any delay. And its capacity is sufficient to let the inverter and motor continuously run 3 or more minutes. Hence, in the moment of waiting factory’s emergency generator to start-up and coupling the loads, the motor and the machine it drive will be running smoothly without any interruption. The DC power back up system consists of lead-acid batteries, charge-discharge control circuits, and inverter circuit as well as parameter modification. Through proper design and fabrication, the developed system is connected to an inverter, which then drives a pump’s motor in a piping system. Finally, to verify the system properties, several modes of power failure are simulated to test the system performance and the results prove that the system can fulfill the requirements.