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基于虛擬阻抗的交直交牽引變電所諧波補償策略研究

來源：電工電氣發布時間：2021-05-25 13:25 瀏覽次數：867

基于虛擬阻抗的交直交牽引變電所諧波補償策略研究

李林蔚

(中車工業研究院有限公司，北京 100070)

摘要：運用虛擬阻抗技術進行諧波補償，可降低供電電壓的諧波畸變率，從而改善電壓質量。分析了電力機車諧波電流對交直交牽引變電所供電電壓的影響和引入虛擬阻抗技術進行諧波補償的原理。使用帶通濾波器從牽引變電所輸出電流中分解出各次諧波分量，并在諧波域引入虛擬阻抗，抵消牽引變電所輸出端等效阻抗，降低供電電壓的諧波畸變率。該方案無需增加額外補償設備，只需改進控制策略即可改善供電電壓質量。設計了控制策略，并基于 MATLAB/Simulink 軟件進行了仿真驗證，結果表明，所提方案明顯降低了交直交牽引變電所供電電壓的諧波畸變率，具有諧波補償效果。

關鍵詞：交直交牽引變電所；電能質量；多重化準比例諧振控制器；虛擬阻抗；諧波補償

中圖分類號：TM922.4 ；U223 文獻標識碼：A 文章編號：1007-3175(2021)05-0012-05

Research on the Harmonic Compensation Strategy of AC-DC-AC Traction

Substation Based on Virtual Impedance

LI Lin-wei

（CRRC Industrial Research Institute Co., Ltd, Beijing 100070,China）

Abstract: The virtual impedance technology is introduced to compensate the harmonics to reduce the harmonic distortion of the supply voltage, so as to improve the quality of supply voltage. This paper analyzes the influence of the harmonics generated by locomotive on the supply voltage, and the principle of virtual impedance technology to compensate the harmonics. Each harmonic component is decomposed from the output current of traction substation by the band-pass filter, and the virtual impedance is introduced into the control circuit to offset the equivalent impedance at the output of the traction substation, so as to reduce the harmonic distortion of the supply voltage. The scheme does not need to add additional compensation equipment, but needs to modify the control strategy to improve the quality of supply voltage.The control strategy is designed, and simulation based on MATLAB/Simulink is conducted. The results show that the proposed scheme can

significantly reduce the harmonic distortion of the supply voltage of the ac-dc-ac traction substation.

Key words: AC-DC-AC traction substation; power quality; multiple quasi proportional resonance(M-Q-PR) controller; virtual impedance;harmonic compensation

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基于虛擬阻抗的交直交牽引變電所諧波補償策略研究