抑制工業設施內諧波共振之分散式主動濾波器

在工廠配電系統中, 常安裝虛功補償電容, 以增進功率因數, 但是不當的虛功補償電容容量, 可能會和已有之變壓器、饋線上的電感產生相互作用, 此現象即諧波共振, 諧波共振會在系統上產生大量諧波電壓和電流, 使得電壓及電流品質皆嚴重惡化。針對諧波共振, 典型的解決方案是安裝被動濾波器,然而此種方式, 適當的設計需要對系統負載可能的變動範圍皆加以考慮, 此過程相當耗費時間與人力; 包含主動與被動部分的混合式主動濾波器,乃是由上述方式改進而來, 但是其設計亦須考慮主動與被動部分間的匹配; 而傳統電流補償式主動濾波器, 由於設計原理限制, 並不適合解決此問題, 且造價高昂。為此, 本論文提出了應用於抑制工廠諧波共振之分散式主動濾波器,在此系統中, 每一台濾波器可被看成是諧波電導, 各自具有獨立的諧波電導-虛功消耗下降控制器, 用以平均分配各主動濾波器之虛功消耗, 毋須任何額外的通訊介面; 並且得以縮小每一台濾波器的大小, 以減少系統總體成本。本論文以一典型工廠諧波共振的模擬電路, 以詳細討論所提出之系統的濾波效果, 以及各主動濾波器虛功消耗分配; 另外也展示實驗的結果, 以驗證所提想法的可行性。

關鍵字

主動濾波器；諧波共振；功因校正

並列摘要

VAr support capacitors are often installed to improve displacement power factor in industrial facilities, but they could also conduct considerable voltage and current harmonics due to harmonic resonance phenomenon. Various harmonic filter strategies have been proposed. Passive L-C filter is the most typical solution for above phenomenon. Hybrid active filter which features harmonic isolation provides an alternative. Nevertheless, they require extensive system studies to achieve a good design. In addition, conventional active filter cannot damp harmonic resonance and usually brings high cost. This thesis hence proposes a distributed active filter design for harmonics damping within industry facility. In this system, active filter operates as a harmonic conductance with a droop characteristic. The droop control between the harmonic VAr consumption Q of the active filter and its harmonic conductance G is developed to coordinate the operation among individual active filters, so that each unit can share harmonic filtering workload in proportion to the rated capacity without any communications. Simulation and laboratory prototype are conducted to validate the effectiveness of the proposed approach.

並列關鍵字

active filter ； harmonic resonance ； power factor correction

參考文獻

[1] S. Bhattacharya and D. Divan, “Active filter solutions for utility interface of industrial loads,” in Proceedings of the 1996 International Conference on Power Electronics, Drives and Energy Systems for Industrial Growth, vol. 2, 1996, pp. 1078–1084.

[2] ——, “Synchronous frame based controller implementation for a hybrid series active filter system,” in IEEE-IAS 13rd Annu. Meeting, vol. 3, 1995, pp. 2531–2540.

[3] H. Fujita and H. Akagi, “A practical approach to harmonic compensation in power systemsseries connection of passive and active filters,” IEEE Transactions on Industry Applications, vol. 27, no. 6, pp. 1020–1025, 1991.

[4] R. H. Simpson, “Misapplication of power capacitors in distribution systems with nonlinear loadsxthree case histories,” IEEE Transactions on Industry Applications, vol. 41, no. 1, pp. 134–143, 2005.

[6] C. Pongsnwat and S. Premrudeepreechacharn, “Harmonic resonance assessment in low voltage distribution system,” in International Conference on Power System Technology, vol. 1, 2004, pp. 264–269.

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抑制工業設施內諧波共振之分散式主動濾波器

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