本文關(guān)鍵詞：MW級光伏并網(wǎng)逆變器的研究　出處：《北京交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 光伏發(fā)電 功率組件 空間矢量脈寬調(diào)制 共模漏電流 低電壓穿越

【摘要】：大規(guī)模光伏電站是當(dāng)前國內(nèi)最主要的新能源發(fā)電形式。MW級光伏并網(wǎng)逆變器因其在高效率、高功率等級、高可靠性等方面的優(yōu)勢,也將成為業(yè)界發(fā)展的重要方向。因此,本文圍繞MW級光伏并網(wǎng)逆變器展開研究,主要完成了MW級光伏并網(wǎng)逆變器設(shè)計與光伏并網(wǎng)逆變器低電壓穿越技術(shù)的研究,并通過搭建系統(tǒng)仿真模型與實(shí)驗(yàn)平臺對樣機(jī)整體設(shè)計與性能進(jìn)行了驗(yàn)證。 首先,功率組件設(shè)計是MW級光伏并網(wǎng)逆變器設(shè)計的重點(diǎn)和難點(diǎn)。其設(shè)計應(yīng)綜合考慮系統(tǒng)分布電感影響。為了便于組裝與維護(hù),本文功率組件采用模塊化設(shè)計,主要完成了直流支撐電容選擇、吸收電路設(shè)計、組件并聯(lián)均流電路設(shè)計和水冷散熱設(shè)計等。并結(jié)合仿真、組件測試與整機(jī)實(shí)驗(yàn)驗(yàn)證了組件設(shè)計的合理性與可靠性。 其次,分析研究了MW級光伏并網(wǎng)逆變器的控制策略并完成LCL濾波電路的設(shè)計。建立了系統(tǒng)的數(shù)學(xué)模型,確立了基于網(wǎng)壓定向的雙閉環(huán)控制策略。在此基礎(chǔ)上,完成了LCL濾波電路的參數(shù)計算。并通過仿真和實(shí)驗(yàn)驗(yàn)證了系統(tǒng)控制策略的穩(wěn)定性和LCL濾波電路設(shè)計的正確性。 第三,針對光伏系統(tǒng)共模漏電流問題,設(shè)計了共模抑制濾波電路。分析和研究了系統(tǒng)共模漏電流的產(chǎn)生機(jī)理和影響因素。在此基礎(chǔ)上,研究了改進(jìn)SVPWM調(diào)制策略與共模抑制濾波電路對共模漏電流抑制原理。從系統(tǒng)角度出發(fā),確定了外加共模濾波電路抑制du/dt和漏電流的方法,并通過實(shí)驗(yàn)進(jìn)行了驗(yàn)證。 第四,對電網(wǎng)電壓對稱跌落與不對稱跌落情況下光伏發(fā)電系統(tǒng)的低電壓穿越控制策略進(jìn)行了分析和研究。根據(jù)國網(wǎng)對光伏低電壓穿越的最新規(guī)定,分析了網(wǎng)壓對稱跌落時的無功補(bǔ)償策略；討論研究了網(wǎng)壓不對稱跌落時電壓和電流的正負(fù)序分離方法以及控制目標(biāo)。并對光伏并網(wǎng)逆變器在對稱與不對稱電網(wǎng)電壓跌落情況下的控制策略進(jìn)行仿真分析和實(shí)驗(yàn)驗(yàn)證。 最后在樣機(jī)的基礎(chǔ)上,通過實(shí)驗(yàn)完成并網(wǎng)電流總諧波THD、功率因數(shù)、系統(tǒng)效率、器件溫升、低電壓穿越能力等的測試,綜合實(shí)驗(yàn)結(jié)果分析表明MW級光伏并網(wǎng)逆變器滿足設(shè)計要求。
[Abstract]:Large-scale photovoltaic power station is the most important new energy generation form in China at present. MW class photovoltaic grid-connected inverter has the advantages of high efficiency, high power level, high reliability and so on. It will also become an important direction of development in the industry. Therefore, this paper focuses on the research of MW photovoltaic grid-connected inverter. The design of MW class photovoltaic grid-connected inverter and the low-voltage traversing technology of photovoltaic grid-connected inverter are studied, and the overall design and performance of the prototype are verified by building the system simulation model and experimental platform. First of all, the power module design is the key and difficult point in the design of MW class photovoltaic grid-connected inverter. Its design should take into account the influence of distributed inductance of the system, in order to facilitate the assembly and maintenance. In this paper, the modular design of the power module, mainly completed the selection of DC support capacitance, absorption circuit design, components parallel current sharing circuit design and water cooling heat dissipation design, and combined with simulation. The rationality and reliability of the component design are verified by the component test and the whole machine experiment. Secondly, the control strategy of MW class photovoltaic grid-connected inverter is analyzed and the design of LCL filter circuit is completed. The mathematical model of the system is established. A double closed loop control strategy based on network voltage orientation is established. The parameter calculation of the LCL filter circuit is completed, and the stability of the control strategy and the correctness of the design of the LCL filter circuit are verified by simulation and experiment. Thirdly, aiming at the common mode leakage current of photovoltaic system, the common mode suppression filter circuit is designed, and the mechanism and influencing factors of the common mode leakage current are analyzed and studied. The improved SVPWM modulation strategy and the common mode suppression filter circuit for the common mode leakage current suppression principle are studied. From the system point of view, the method of external common mode filter circuit to suppress du/dt and leakage current is determined. It is verified by experiments. In 4th, the low voltage traversing control strategy of photovoltaic power system under the condition of symmetrical drop and asymmetric drop is analyzed and studied. According to the latest regulation of photovoltaic low voltage traversing in national network. The reactive power compensation strategy for symmetrical drop of network pressure is analyzed. In this paper, the positive and negative sequence separation method of voltage and current during asymmetric drop of grid voltage and its control target are discussed, and the control strategy of photovoltaic grid-connected inverter under the condition of symmetrical and asymmetric voltage drop of power network is simulated and analyzed. Experimental verification. Finally, on the basis of the prototype, the total harmonic THD, power factor, system efficiency, device temperature rise and low voltage traversing ability of grid-connected current are tested through experiments. Comprehensive experimental results show that MW class photovoltaic grid-connected inverter meets the design requirements.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王寶歸;周飛;童亦斌;;基于IGBT并聯(lián)技術(shù)的250kW光伏并網(wǎng)逆變器[J];大功率變流技術(shù);2009年04期

2 竇汝振;;減小異步電機(jī)共模電壓的SVPWM控制方法的分析[J];變頻器世界;2005年01期

3 陳名;孫旭東;黃立培;;三相逆變器共模傳導(dǎo)電磁干擾的建模與分析[J];電工電能新技術(shù);2012年01期

4 胡建輝;李錦庚;鄒繼斌;譚久彬;;變頻器中的IGBT模塊損耗計算及散熱系統(tǒng)設(shè)計[J];電工技術(shù)學(xué)報;2009年03期

5 趙晶;趙爭鳴;周德佳;;太陽能光伏發(fā)電技術(shù)現(xiàn)狀及其發(fā)展[J];電氣應(yīng)用;2007年10期

6 衛(wèi)三民,吳斌,蘇位峰,宇文博;大功率變頻器中的共模電壓及其消除方法[J];電力電子技術(shù);2005年05期

7 徐曉彬;;大功率全橋變流器次級整流吸收電路研究[J];電力電子技術(shù);2009年01期

8 李建林;胡書舉;孔德國;許洪華;;全功率變流器永磁直驅(qū)風(fēng)電系統(tǒng)低電壓穿越特性研究[J];電力系統(tǒng)自動化;2008年19期

9 趙紫龍;吳維寧;王偉;;電網(wǎng)不對稱故障下直驅(qū)風(fēng)電機(jī)組低電壓穿越技術(shù)[J];電力系統(tǒng)自動化;2009年21期

10 劉云潺;黃純;歐立權(quán);趙偉明;;基于dq變換的三相不平衡電壓暫降檢測方法[J];電力系統(tǒng)及其自動化學(xué)報;2007年03期

相關(guān)博士學(xué)位論文 前2條

1 馬琳;無變壓器結(jié)構(gòu)光伏并網(wǎng)逆變器拓?fù)浼翱刂蒲芯縖D];北京交通大學(xué);2011年

2 蔚蘭;分布式并網(wǎng)發(fā)電系統(tǒng)低電壓穿越問題的若干關(guān)鍵技術(shù)研究[D];上海大學(xué);2011年

，

本文編號：1384445