Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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基于NPC的光伏并網逆變系統的研究

來源:電工電氣發布時間:2021-08-18 10:18 瀏覽次數:18

基于NPC的光伏并網逆變系統的研究

趙修瑞,李鍇,李又豐
(黑龍江科技大學 電氣與控制工程學院,黑龍江 哈爾濱 150027)
 
    摘 要:基于三電平中點鉗位 (NPC) 變換器,設計了三電平光伏并網逆變系統,在 NPC 總功率允許的范圍內,將盡可能多的光伏組串連接到兩條匯流直流母線上,且 NPC 的輸出電壓波形能夠以較低的開關頻率運行,提高系統的效率和電能質量,降低損耗。在 DC-DC 的變換電路中,選擇了 LLC 半橋諧振變換器,在升壓的同時實現最大功率點跟蹤,引入平衡因子對中點電壓進行控制,對于對稱電網采用 dq 鎖相環檢測電網側電壓,當網側電壓不平衡的時候,采用二階廣義積分器通過正負序分離檢測電網側電壓跌落程度,并完成鎖相,實現系統在檢測不平衡電網電壓上升以及跌落的時候可以有良好的并網效果。
    關鍵詞:光伏并網;中點鉗位;LLC 半橋諧振變換器;中點電壓平衡法
    中圖分類號:TM464 ;TM615     文獻標識碼:A     文章編號:1007-3175(2021)08-0011-05
 
Research on Photovoltaic Grid-Connected
Inverter System Based on NPC
 
ZHAO Xiu-rui, LI Kai, LI You-feng
(School of Electrical and Control Engineering, Heilongjiang University of Science and Technology, Harbin 150027, China)
 
    Abstract: Based on three-level neutral point clamped (NPC) converter, a photovoltaic grid-connected inverter system is designed in this paper. This system allows as many PV strings as possible to be connected to two DC busbars within the power limit of the NPC, and the output voltage shape can operate at a lower switching frequency which could improve efficiency and power quality but with low loss. Firstly, the LLC half-bridge resonant converter is selected to track the maximum power point in DC-DC conversion circuit. Secondly, a balance factor is introduced to control the neutral point voltage, and the dq phase-locked loop is utilized to test the voltage of symmetrical power grid. Thirdly,second-order generalized integrator (SOGI) is to test the voltage dip when the voltage on line side is unbalanced by the method of positive and negative sequence separation control and finally lock the phase. In conclusion, the proposed system could provide an effective networking when the voltage on line-side is tested both rising and dropping.
    Key words: photovoltaic grid-connected; NPC; LLC half-bridge resonant converter; midpoint voltage balance method
 
參考文獻
[1] 黃天成,秦燕,謝衛軍,王洪. 跟蹤式組合光伏發電裝置的效率及成本分析[J] . 南昌大學學報(理科版),2018,42(6) :553-556.
[2] 王士軒. 新能源產業集群規模、分布與產能效應研究[D]. 烏魯木齊:新疆大學,2019.
[3] 李澤斌. 三相光伏并網逆變器控制方法研究及裝置研制[D]. 長沙:湖南大學,2015.
[4] MIRZA Adeel Feroz, MANSOOR Majad, LING Qiang,YIN Baoqun, JAVED M Y.A salp-swarm optimization based MPPT technique for harvesting maximum energy from PV systems under partial shading conditions[J].Energy Conversion and Management,2020,209(32) :112625.
[5] 柴亞盼,童亦斌. 陰影遮擋下組串式 MPPT 應用研究[J]. 大功率變流技術,2014(4) :20-24.
[6] 王杰. 基于模糊控制的光伏發電系統 MPPT 的研究[D]. 淮南:安徽理工大學,2018.
[7] GUO Xiaoqiang, WU Weiyang, QI Hanhong.Control Strategies of Three-Phase PV Grid-Connected Inverter under Distorted and Unbalanced Voltage Conditions[J].Proceeding of the CSEE 2013,33(3) :22-28.
[8] 王汝田,施志明,文湘雲. 基于恒壓估計與擾動觀測結合的 MPPT 算法[J] . 東北電力大學學報,2019,39(6) :24-29.
[9] 李華. 三相光伏系統并網控制及低電壓穿越的研究[D]. 淮南:安徽理工大學,2013.
[10] 安志龍. 光伏并網控制策略與低電壓穿越技術研究[D]. 北京:華北電力大學,2012.
[11] 孫紹華. 不平衡電網條件下并網逆變關鍵技術研究[D]. 哈爾濱:哈爾濱工業大學,2015.

 

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