具有低頻功率解耦功能的直流變換系統(tǒng)及其控制策略研究
發(fā)布時間：2019-01-06 15:11
【摘要】：對于高壓直流輸電系統(tǒng)中的高壓直流變換器,高電壓是其設(shè)計難點之一,一般采用多模塊串并聯(lián)組合結(jié)構(gòu)來解決高壓問題。而直流電壓在經(jīng)多個單相逆變器變換至交流電壓或接三相不平衡負載時直流總線將存在低頻紋波,從而影響直流側(cè)電能質(zhì)量。該文研究了ISOP(input-series outputparallel)系統(tǒng)的低頻功率解耦控制,通過注入補償電流抵消紋波電流,實現(xiàn)功率解耦,抑制直流側(cè)的低頻紋波波動,顯著提高系統(tǒng)電能質(zhì)量。為了實現(xiàn)低頻紋波的精確控制,解耦系統(tǒng)采用多重準比例諧振控制,通過對多個特定頻次的諧波電流進行跟蹤并且提供相對較低阻抗的通道來釋放諧波電流,以補償直流側(cè)電壓波動。最后通過仿真驗證了文中所提方案的可行性與優(yōu)越性。
[Abstract]:High voltage is one of the difficulties in the design of high voltage DC / DC converters in HVDC transmission systems, and the multi-module series-parallel structure is generally used to solve the problem of high voltage. When DC voltage is converted to AC voltage or three-phase unbalanced load by several single-phase inverters, the DC bus will have low frequency ripple, which will affect the power quality of DC side. In this paper, the low frequency power decoupling control of ISOP (input-series outputparallel) system is studied. The power decoupling is realized by injecting compensation current to cancel the ripple current, and the low frequency ripple fluctuation on the DC side is restrained, and the power quality of the system is improved significantly. In order to control the low frequency ripple accurately, the decoupling system adopts multiple quasi proportional resonance control, which releases harmonic current by tracking the harmonic current of several specific frequencies and providing a channel with relatively low impedance. To compensate for DC side voltage fluctuations. Finally, the feasibility and superiority of the proposed scheme are verified by simulation.
【作者單位】： 國家電能變換與控制工程技術(shù)研究中心(湖南大學);株洲中車時代電氣股份有限公司;
【基金】：國家自然科學基金項目(51677063)~~
【分類號】：TM46
本文編號：2402960
[Abstract]:High voltage is one of the difficulties in the design of high voltage DC / DC converters in HVDC transmission systems, and the multi-module series-parallel structure is generally used to solve the problem of high voltage. When DC voltage is converted to AC voltage or three-phase unbalanced load by several single-phase inverters, the DC bus will have low frequency ripple, which will affect the power quality of DC side. In this paper, the low frequency power decoupling control of ISOP (input-series outputparallel) system is studied. The power decoupling is realized by injecting compensation current to cancel the ripple current, and the low frequency ripple fluctuation on the DC side is restrained, and the power quality of the system is improved significantly. In order to control the low frequency ripple accurately, the decoupling system adopts multiple quasi proportional resonance control, which releases harmonic current by tracking the harmonic current of several specific frequencies and providing a channel with relatively low impedance. To compensate for DC side voltage fluctuations. Finally, the feasibility and superiority of the proposed scheme are verified by simulation.
【作者單位】： 國家電能變換與控制工程技術(shù)研究中心(湖南大學);株洲中車時代電氣股份有限公司;
【基金】：國家自然科學基金項目(51677063)~~
【分類號】：TM46
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