具小型風力發電市電併聯功能之在線式不斷電系統

本文旨在建立一穩健的風力發電與市電併聯系統，透過在線式不斷電系統提高系統可靠度，於系統模式切換上分為三種模式：正常模式、市電電壓下降補償模式與備用模式，於正常模式下，可由市電與風力發電混合功率供給負載，或由市電獨立供給負載；市電電壓下降補償模式下，由電池端提供功率補足市電電壓下降量，使負載端電壓維持穩定；於備用模式下，可由電池與風力發電混合功率供給負載，或電池獨立供給負載，此三種模式目的在於使負載端功率維持穩定。採用單相三臂式轉換器為主架構，優點為效率高於全橋式轉換器、控制策略簡易、市電電壓下降補償及減少負載端與市電端總諧波失真，並且電池與風力發電經由混合式充放電電路達到混合供電，或電池端獨立供電；本文使用改良型增量電導法進行最大功率追蹤，此法藉由調整開關責任週期到達最大功率點區域，到達此區域時，設定較小擾動量進行擾動，故負載端功率變化與功率損失較小。為測試本文所提系統之三種模式與最大功率追蹤，本文改變市電輸入電壓及風速，使系統經歷市電電壓下降補償、市電與風力發電混合供電、風力發電與電池混合供給、市電獨立供給負載與最大功率追蹤，以證明本文所提系統於供電可靠度和電力品質之性能。

關鍵字

風力發電；市電併聯；不斷電系統；市電電壓下降補償；最大功率點

並列摘要

This thesis is to built a robust grid-connected wind-turbine generator (WTG), and it through on-line uninterruptible power supply system(UPSs) to rise stability. The mode switching have three mode : normal mode, grid voltage sag compensation (GVSC) mode and backup mode. The grid and WTG can provide to load, or the grid stand alone under normal mode. The battery compensated grid voltage sag quantity under GVSC mode, and then load’s voltage keep stability. The battery and WTG provided to load, or the battery stand alone under backup mode. Let the load’s power maintain stability in the three modes. The main topology is used single phase three-arm legs converter. The advantage is the efficiency higher then full bridge converter, simple control strategy and decrease the total harmonic distortion of the grid’s and load’s. The battery and WTG provided to load through hybrid charge/discharge converter, or the battery stand alone. The maximum power point (MPP) tracked by improved increment conductance (IIC) method, it arrived in MPP’s area through regulated duty ratio. The area have small variation, so the load’s power variation and the power losing can decrease. To test three modes and MPP tracking of the proposed system, the experiment change grid’s input voltage and wind speed. Let system experienced GVSC, the grid and WTG hybrid power, the battery hybrid with WTG, the grid stand alone and MPPT. To verify the system's stability and quality.

並列關鍵字

wind-turbine generator (WTG) ； grid-connected ； UPSs ； MPP. ； grid voltage sag compensation (GVSC)

參考文獻

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[36] 黃意明，“風力發電之類神經網路最大功率追蹤”，中原大學，電機工程學系，碩士學位論文，民國95年。

[47] 呂學德，“以同時擾動隨機近似法進行風場永磁同步發電機之最大功率追蹤控制”，中原大學，電機工程學系，碩士學位論文，民國95年。

[3] J. C. Wu and H. L. Jou, “A New UPS Scheme Provides Harmonic Suppression and Input Power Factor Correction, ” IEEE Trans. on Industrial Electronics, Vol.42, No. 6. December 1995.

[4] S. Martínez, M. Castro, R. Antoranz and F. Aldana, “Off-line uninterruptible power supply with zero transfer time using integrated magnetics, ” IEEE Trans. Industrial Electronics, Vol. 36, No. 3, pp. 441–445, Agust 1989.

國際替代計量

具小型風力發電市電併聯功能之在線式不斷電系統

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