- 學位論文
前饋可變積分參數比例積分微分控制器之設計與其於不斷電系統換流器的應用
Design of a Feedforward Variable Integral Parameter PID Controller and Its Application to UPS Inverters
摘要
傳統比例積分微分控制器因架構簡單以及設計容易，已被廣泛應用於不斷電系統換流器。雖然傳統比例積分微分控制器在線性負載下，能夠達到好的動態及穩態響應，然而在高度非線性負載的狀況下，穩態誤差存在，使得換流器輸出電壓產生高總諧波失真以及慢的動態響應，不精確的追蹤控制將發生。因此，本論文提出具有前饋可變積分參數比例積分微分控制器，可以讓換流器在大的參數變動或高度非線性負載狀況下，藉由可變的積分參數之調整，來達成系統的零穩態誤差，更進一步的使用前饋控制來增強系統的追蹤控制能力，使得換流器可以有高品質的交流輸出電壓。模擬結果顯示所提出控制器的有效性，同時也與傳統比例積分微分控制的換流器來做比較，以驗證所提出換流器的高性能。
並列摘要
Conventional PID controllers have been broadly applied to UPS inverters due to their simple structures and easy designs. Although in the case with linear load, conventional PID controllers can achieve good dynamic and steady-state response. However, in the case with highly non-linear load, steady-state errors will occur, and tracking control may not be precise, thus leading to high total harmonic distortion (THD) and slow dynamic response of inverter output voltage. Thus, this thesis proposes a PID controller with feedforward variable integral parameter. In the case with large parameter variation or highly non-linear load, the goal of zero steady-state error of the system can be led by adjusting the integral parameter. Furthermore, the feedforward control is used to improve the system’s tracking control capability, resulting in high quality of the output AC voltage of the inverter. The simulation result shows the validation of the proposed controller. For comparison purpose, this thesis also shows conventional PID controlled UPS inverter so that the high performance of the proposed controller can be verified.