基于滑??刂频娜嚯p降壓式并網(wǎng)逆變器
來源:電子技術(shù)應(yīng)用2013年第3期
宋 星1,房 勇2,李 猛3,張 闖4
1.湖南省電力公司湘潭電業(yè)局,湖南 湘潭411104; 2.西安黃河光伏科技股份有限公司,陜西 西安710043; 3.河南省電力公司駐馬店供電公司,河南 駐馬店463000; 4.貴州電網(wǎng)公司貴陽供電局,貴州 貴陽550001
摘要: 對三相雙降壓式并網(wǎng)逆變器這一新型拓撲的滑模控制進行了研究,使系統(tǒng)獲得良好的魯棒性。首先,對三相雙降壓式并網(wǎng)逆變器進行了等效分析。然后,根據(jù)等效分析電路重點對其滑??刂七M行了設(shè)計,并在控制律中采用了平滑函數(shù)來取代符號函數(shù)以削弱抖振。仿真結(jié)果表明,采用滑??刂坪蟮娜嚯p降壓式并網(wǎng)逆變器具有很好的動態(tài)和穩(wěn)態(tài)性能,且輸出的并網(wǎng)電流諧波含量低,波形質(zhì)量好。
中圖分類號: TM464
文獻標識碼: A
文章編號: 0258-7998(2013)03-0070-04
文獻標識碼: A
文章編號: 0258-7998(2013)03-0070-04
Three-phase dual buck grid-connected inverter based on sliding mode control
Song Xing1,F(xiàn)ang Yong2,Li Meng3,Zhang Chuang4
1.Xiangtan Electric Power Bureau of Hunan Electric Power Company,Xiangtan 411104,China; 2.Xi′an Huanghe Photovoltaic Technology Co. Ltd,Xi′an 710043,China; 3.Zhumadian Power Supply Company of Henan Electric Power Company,Zhumadian 463000,China; 4.Guiyang Power Supply Bureau of Guizhou Power Grid Grp.,Guiyang 550001,China
Abstract: To obtain the good robustness, sliding mode control of the three-phase dual buck grid-connected inverter is studied. Firstly, the control system can be designed based on the equivalent analysis circuit. Then, its sliding mode control is designed based on the equivalent analysis circuit. And the sign function of control rate is replaced by the smooth function to weaken the chattering. Simulation results show that the inverter used sliding mode control show good dynamic and static performance. And the output current of the inverter is high quality and the harmonic content is low.
Key words : three-phase dual buck grid-connected inverter;bridge arm through;sliding mode control;equivalent control;robustness
在可再生能源發(fā)電技術(shù)飛速發(fā)展的今天,并網(wǎng)逆變器作為可再生能源發(fā)電的關(guān)鍵設(shè)備,已經(jīng)成為當前的研究熱點。三相雙壓式并網(wǎng)逆變器作為一種新型拓撲,從根本上克服了傳統(tǒng)的三相橋式并網(wǎng)逆變器存在的橋臂直通問題[1-2],工作時不用插入死區(qū)時間,可以很好地提高輸出波形的質(zhì)量。因此,三相雙降壓式并網(wǎng)逆變器具有重要的應(yīng)用價值。但是在三相雙降壓式并網(wǎng)逆變器的控制研究中,目前常見的只有傳統(tǒng)的PWM控制、滯環(huán)控制和單周控制。其中PWM控制的動態(tài)性能差且存在穩(wěn)態(tài)誤差[3];而滯環(huán)控制雖然具有很好的魯棒性但其開關(guān)頻率不固定,從而導(dǎo)致濾波器設(shè)計困難[4];單周控制雖然不存在穩(wěn)態(tài)誤差且抗輸入擾動能力強,但其抗輸出擾動能力薄弱[5]。
此內(nèi)容為AET網(wǎng)站原創(chuàng),未經(jīng)授權(quán)禁止轉(zhuǎn)載。