不完全微分比例積分微分控制的直流-交流換流器

Incomplete Differential Proportional Integral Derivative Controlled DC-AC Converters

王珮珊(Pei-Shan Wang)

指導教授 ： 吳榮慶

義守大學/電機資訊學院/電機工程學系/碩士(2015年)

https://doi.org/10.6343/ISU.2015.00026

摘要

比例積分微分控制器由於構造簡單且設計容易已被普遍應用於直流-交流換流器中。然而當受到較大的外部干擾發生時，傳統比例積分微分控制器之微分項容易放大系統的雜訊，更甚者造成系統的震盪和不穩定。為了解決傳統比例積分微分控制器微分項之缺點，本論文提出不完全微分比例積分微分控制器，其在傳統比例積分微分控制器中加入一低通濾波器，以抑制大的外來干擾。此提出的控制器不僅保有傳統比例積分微分控制器結構簡單、設計容易的優點，也藉由加入一低通濾波來改善傳統比例積分微分控制微分項在受到較大的外部干擾下易放大高頻雜訊的缺點，使得追蹤控制更精確與增強整體系統性能。模擬結果顯示所提出的直流-交流換流器之輸出電壓即便在嚴重的非線性負載下，仍然可以得到較低的總諧波失真與較快的動態響應。

關鍵字

比例積分微分控制器 ； 直流-交流換流器 ； 不完全微分 ； 低通濾波器 ； 總諧波失真

並列摘要

Traditional PID (proportional-integral-derivative) controllers have been broadly applied to DC-AC inverters due to their simple structures and easy designs. However, in cases with large external interferences, noises of the system may easily be magnified due to the derivative term of traditional PID controllers, further causing system oscillations and instability. To reduce the disadvantage of the derivative term of traditional PID controllers, this thesis proposed an incomplete differential PID controller, by adding a low-pass filter to a traditional PID controller to inhibit external interferences. This proposed controller features not only the advantages of traditional PID controllers, which include simple structures and easy designs, but also higher precisions of tracking control and better overall system performances as the result of adding a low-pass filter to resolve the issue of magnified noises under large external interferences caused by the derivative term of traditional PID controllers. The simulation result shows that the output voltage of the proposed DC-AC converter can still achieve low total harmonic distortion (THD) and fast dynamic response even in cases with highly non-linear load.

並列關鍵字

PID (proportional-integral-derivative) controllers ； DC-AC converters ； incomplete differential ； low-pass filter ； total harmonic distortion (THD)

參考文獻

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