發(fā)布時間：2018-05-15 09:30

  本文選題：弱電網(wǎng) + LCL濾波��； 參考：《天津大學(xué)》2014年碩士論文

【摘要】：隨著能源問題的日益突出,分布式發(fā)電以其清潔、高效、可再生等優(yōu)勢越來越廣泛地被應(yīng)用于電力系統(tǒng)當(dāng)中,然而相對于傳統(tǒng)發(fā)電技術(shù),分布式發(fā)電系統(tǒng)中電力電子裝置的并網(wǎng)存在穩(wěn)定性的隱患。分布式發(fā)電的應(yīng)用以及遠距離輸電線路的架設(shè)也向電網(wǎng)引入了大量線路阻抗,使電網(wǎng)呈現(xiàn)出弱電網(wǎng)的特性,進一步將電網(wǎng)-并網(wǎng)逆變器構(gòu)成的交互系統(tǒng)的穩(wěn)定性問題復(fù)雜化。本文以交互系統(tǒng)Middlebrook判據(jù)為基礎(chǔ),闡明了這種不穩(wěn)定性的產(chǎn)生機制,給出了逆變器-電網(wǎng)交互系統(tǒng)的穩(wěn)定性判據(jù),對比分析了不同電流控制器及濾波器配置下,電網(wǎng)阻抗對于系統(tǒng)穩(wěn)定裕度的影響,并從頻域的角度具體研究了電網(wǎng)阻抗對系統(tǒng)低頻段高頻段的影響。指出電網(wǎng)阻抗會導(dǎo)致低頻段準諧波控制器中的諧波補償尖峰隨著阻抗值的增大而進入系統(tǒng)帶寬外,威脅系統(tǒng)的穩(wěn)定性,另外還會導(dǎo)致高頻段LCL濾波器產(chǎn)生的諧振尖峰發(fā)生偏移,進而影響有源阻尼控制器的有效性,導(dǎo)致系統(tǒng)失穩(wěn)。本文由此提出了針對這兩種情況的解決方案,在基于帶通濾波器有源阻尼控制方法的基礎(chǔ)上引入自適應(yīng)陷波濾波器,實現(xiàn)了一種自適應(yīng)的有源阻尼控制方法,并通過增加電網(wǎng)感抗實時檢測校正環(huán)節(jié),補償了當(dāng)電網(wǎng)失真情況下的前饋控制的不穩(wěn)定性,實現(xiàn)了自適應(yīng)并網(wǎng)電流控制策略。兩種方法都依賴于準確的電網(wǎng)阻抗實時檢測,從有源阻尼控制以及含前饋控制的閉環(huán)電流跟蹤控制兩個方向解決了系統(tǒng)諧振尖峰隨電網(wǎng)參數(shù)變化而發(fā)生位移的問題,提高了并網(wǎng)逆變系統(tǒng)的穩(wěn)定裕度。最后基于Matlab/Simulink平臺搭建了7.7kW單相并網(wǎng)逆變仿真模型,并基于TMS320F28335控制芯片設(shè)計了440W并網(wǎng)逆變器實驗平臺,仿真實驗結(jié)果支持了本文理論分析,佐證了基于自適應(yīng)陷波濾波器的有源阻尼控制方法的有效性及自適應(yīng)性。
[Abstract]:With the increasingly prominent energy problem, distributed generation is more and more widely used in power system because of its advantages of clean, efficient and renewable. However, compared with traditional power generation technology, distributed generation is more and more widely used in power system. In the distributed generation system, there is a hidden danger of the stability of the power electronic device connected to the grid. The application of distributed generation and the erection of long-distance transmission lines also introduce a large number of line impedance to the power network, which makes the power grid show the characteristic of weak grid, and further complicates the stability of the interactive system composed of grid-connected inverter. Based on the Middlebrook criterion of interactive system, this paper clarifies the mechanism of the instability, gives the stability criterion of inverter-grid interactive system, and compares and analyzes the different current controller and filter configuration. The influence of power grid impedance on the stability margin of the system is studied. The influence of power grid impedance on the low frequency band and high frequency band of the system is studied from the point of view of frequency domain. It is pointed out that the impedance of the power network will cause the harmonic compensation spike in the low frequency band quasi harmonic controller to enter the system bandwidth with the increase of the impedance value, which will threaten the stability of the system. In addition, it will also lead to the shift of the resonant spike produced by the LCL filter in the high frequency band. Furthermore, the effectiveness of the active damping controller is affected, which leads to the instability of the system. In this paper, an adaptive notch filter is introduced based on the active damping control method of bandpass filter, and an adaptive active damping control method is realized. The instability of feedforward control is compensated by adding real-time detection and correction link of reactance, and the adaptive grid-connected current control strategy is realized. Both methods depend on accurate real-time detection of power system impedance. The problem of the displacement of the system resonance spike with the change of the network parameters is solved from the active damping control and the closed-loop current tracking control with feedforward control. The stability margin of grid-connected inverter system is improved. Finally, the simulation model of 7.7kW single-phase grid-connected inverter is built based on Matlab/Simulink platform, and the experiment platform of 440W grid-connected inverter is designed based on TMS320F28335 control chip. The simulation results support the theoretical analysis of this paper. The validity and adaptability of the active damping control method based on adaptive notch filter are proved.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464;TM615

【參考文獻】

相關(guān)期刊論文 前10條

1 許津銘;謝少軍;唐婷;;弱電網(wǎng)下LCL濾波并網(wǎng)逆變器自適應(yīng)電流控制[J];中國電機工程學(xué)報;2014年24期

2 周林;張密;居秀麗;何國慶;;電網(wǎng)阻抗對大型并網(wǎng)光伏系統(tǒng)穩(wěn)定性影響分析[J];中國電機工程學(xué)報;2013年34期

3 尹靖元;金新民;吳學(xué)智;童亦斌;;基于帶通濾波器的LCL型濾波器有源阻尼控制[J];電網(wǎng)技術(shù);2013年08期

4 吳云亞;謝少軍;闞加榮;過亮;;逆變器側(cè)電流反饋的LCL并網(wǎng)逆變器電網(wǎng)電壓前饋控制策略[J];中國電機工程學(xué)報;2013年06期

5 王百永;張俊偉;鄭華榮;肖華鋒;王寶寶;;LCL型并網(wǎng)濾波器參數(shù)設(shè)計方法[J];電源學(xué)報;2012年06期

6 鮑陳磊;阮新波;王學(xué)華;潘冬華;李巍巍;翁凱雷;;基于PI調(diào)節(jié)器和電容電流反饋有源阻尼的LCL型并網(wǎng)逆變器閉環(huán)參數(shù)設(shè)計[J];中國電機工程學(xué)報;2012年25期

7 謝少軍;許津銘;;LCL濾波并網(wǎng)逆變器的電流控制技術(shù)研究綜述[J];電源學(xué)報;2012年04期

8 黃天富;石新春;魏德冰;孫玉巍;王丹;;基于電流無差拍控制的三相光伏并網(wǎng)逆變器的研究[J];電力系統(tǒng)保護與控制;2012年11期

9 許津銘;謝少軍;肖華鋒;;LCL濾波器有源阻尼控制機制研究[J];中國電機工程學(xué)報;2012年09期

10 雷金勇;李戰(zhàn)鷹;盧澤漢;辛煥海;楊歡;;分布式發(fā)電技術(shù)及其對電力系統(tǒng)影響研究綜述[J];南方電網(wǎng)技術(shù);2011年04期

相關(guān)碩士學(xué)位論文 前1條

1 趙云夢;基于準PR控制的單相光伏并網(wǎng)逆變器的研究[D];浙江理工大學(xué);2013年

，

本文編號：1891899