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    弱電網下光伏并網逆變器模糊自適應控制的研究

    時間:2019年03月23日 所屬分類:電子論文 點擊次數:

    摘要:LCL型光伏并網逆變器在弱電網下,電網阻抗的增加,系統穩定性降低。為增強弱電網下系統的穩定性,文章提出了適用于電網阻抗變化的模糊自適應控制方法,實時調整光伏并網逆變器的電流控制器參數以及電容電流反饋系數,以適應電網阻抗變化,提高弱電網情

      摘要:LCL型光伏并網逆變器在弱電網下,電網阻抗的增加,系統穩定性降低。為增強弱電網下系統的穩定性,文章提出了適用于電網阻抗變化的模糊自適應控制方法,實時調整光伏并網逆變器的電流控制器參數以及電容電流反饋系數,以適應電網阻抗變化,提高弱電網情況下的系統相位裕度,保證系統的穩定運行。

      關鍵詞:弱電網,模糊自適應控制,相位裕度

    太陽能學報

      隨著全球能源需求日益增大,人們對以太陽能、風能、潮汐能等新能源為核心的分布式發電技術越發重視,智能電網的概念深入人心。光伏并網逆變器作為分布式電網的重要組成部分,也成為研究的熱門[1]。光伏并網逆變器的控制性能直接影響到并網電流的輸出質量。

      準PR控制對于頻率波動的電網具有一定的抗干擾能力,同時可以消除某一頻率上的穩態誤差,所以有較為廣泛的應用。在弱電網的情況下,由于弱電網下并網阻抗的增大,系統穩定性降低。本文提出適用于弱電網下的自適應控制方法,以改善弱電網下并網逆變器的運行狀態,保證高質量的并網輸出電流。

      1并網逆變器數學模型

      本文采用單相電容電流反饋方式的有源阻尼控制方式。G(iS)為準PR控制器,ug為并網電壓,L1、C、L2分別為逆變器的濾波結構中的逆變器側電感,濾波電容,并網側電感,Lg為并網側的電網阻抗。Kc、Ki分別為并網電流與電容電流反饋系數。

      2準PR控制

      基于內模原理的PR控制器可以對特定頻率的正弦信號進行無靜差追蹤。而PR控制對于光伏并網系統的并網電壓頻率較為敏感,且現實中也不易于實現,故改善為準PR控制,Kp為控制器的比例系數;Kr為控制器的諧振系數;ω0為控制器的諧振頻率;ωc為系統的截止頻率。

      3模糊自適應控制

      根據帶有電容反饋方式的有源阻尼控制的光伏并網逆變器的數學模型,確定該控制方式的相關參數的初始值。包括PR控制器的比例系數Kp與諧振系數Kr,以及電容反饋系數Kc。令并網逆變器的指令電流為iref,并網電流為i2,二者的誤差與誤差變化率令為e與e觶作為模糊控制器的輸入[3]。而模糊控制器的輸出為PR控制器的比例系數,諧振系數以及電容反饋系數的修正量。而模糊控制系統的模糊控制規則根據三個參數的作用而制定。

      本文提出的光伏并網逆變器的模糊自適應控制,控制方式主要是讓PR控制器的比例系數,諧振系數以及電容反饋系數能夠依據指令電流與并網電流之間的誤差值以及誤差的變化率,實現在線調整,以適應電網阻抗變化時的并網系統的穩定運行[4]。

      4仿真與分析

      為了驗證本文提出的自適應方法的可行性,本文借助Matlab/Simulink仿真平臺分析模擬弱電網與強電網的不同電網阻抗下,系統運行的穩定性分析。仿真平臺的系統各基本參數:電網電壓有效值為220V,直流輸入電壓為360V,開關頻率為10kHz,逆變器側電感為600μH,濾波電容10μF,網側電感為150μH,電網感抗3mH。系統沒有自適應過程,幅值裕度為9.84dB,相位裕度為13.2deg。此時系統的相位裕度較小,無法滿足較好的系統動態響應。

      此時幅值裕度為4.06dB,相位裕度為45.5deg。幅值裕度大于3dB保證了系統的魯棒性,而且相位裕度大于45deg,此時系統有較好的動態響應。仿真在0.1s時切換為半載運行,系統半載運行時THD為0.62%,滿足高質量并網電流的要求。

      5結束語

      本文針對弱電網下,電網阻抗增大,導致系統相位裕度降低,系統動態響應較差的問題,提出基于電容電流反饋有源阻尼方式的模糊自適應控制方法,使系統能夠在線調整參數保證系統穩定運行,并通過仿真驗證方法的正確性,因此具有一定的理論研究意義。

      參考文獻:

      [1]張久亮,郭前崗,周西峰.光伏并網逆變器準比例諧振控制仿真研究[J].電測與儀表,2013,50(02):68-72.

      [2]潘冬華,阮新波,王學華,等.增強LCL型并網逆變器對電網阻抗魯棒性的控制參數設計[J].中國電機工程學報,2015,35(10):2558-2566.

      [3]胡曉青,程啟明,王映斐,等.基于自整定FuzzyPI控制的電流跟蹤型光伏并網逆變器[J].太陽能學報,2013,34(06):959-966.

      [4]姚鑫,羅曉曙,廖志賢,等.光伏并網逆變器模糊準PR控制仿真研究[J].電測與儀表,2014,51

      相關期刊推薦:《太陽能學報》(月刊)創刊于1980年,由中國科協主管,中國太陽能學會主辦,北京市太陽能研究所承辦,自創刊以來為我國新能源領域的學術交流、人才培養及促進科研成果產業化等方面做出了貢獻。

      

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