本文選題：雙PWM變換器　切入點：雙饋感應(yīng)發(fā)電機(jī)　出處：《西南交通大學(xué)》2017年碩士論文

【摘要】：基于雙饋感應(yīng)發(fā)電機(jī)(Doubly Fed Induction Generators,DFIG)的雙饋風(fēng)電機(jī)組是我國當(dāng)前風(fēng)電市場的主流發(fā)電設(shè)備。背靠背式雙PWM變換器作為雙饋風(fēng)電系統(tǒng)中應(yīng)用最為廣泛的交流勵磁變換器,是實現(xiàn)雙饋風(fēng)機(jī)轉(zhuǎn)子側(cè)和電網(wǎng)之間頻率轉(zhuǎn)換的裝置,同時也是系統(tǒng)中最主要的諧波源。隨著國內(nèi)外風(fēng)電產(chǎn)業(yè)的迅猛發(fā)展以及風(fēng)電機(jī)組裝機(jī)容量的不斷增加,風(fēng)電諧波標(biāo)準(zhǔn)不斷提高,研究基于雙PWM變換器并網(wǎng)的雙饋式風(fēng)電系統(tǒng)諧波問題具有十分重要的理論指導(dǎo)意義。論文結(jié)合風(fēng)電發(fā)展現(xiàn)狀及特點,分別對風(fēng)電系統(tǒng)和電力電子變換器的諧波研究現(xiàn)狀進(jìn)行了全面的綜述,并分析了現(xiàn)有研究的特點及存在的不足。論文指出目前對雙饋風(fēng)電系統(tǒng)諧波產(chǎn)生機(jī)理的研究還相當(dāng)匱乏,有必要建立具有針對性的諧波研究體系。論文首先分析并研究了電網(wǎng)電壓三相平衡狀態(tài)下雙饋風(fēng)電系統(tǒng)的諧波產(chǎn)生機(jī)理。考慮背靠背式雙PWM變換器結(jié)構(gòu)及調(diào)制方式的特點,基于功率平衡理論,對其直流側(cè)和網(wǎng)側(cè)低頻諧波進(jìn)行分析,并運用雙重傅里葉變換算法,實現(xiàn)轉(zhuǎn)子電流的高頻諧波建模。在網(wǎng)壓平衡諧波研究的基礎(chǔ)上,論文進(jìn)一步分析了網(wǎng)壓不平衡下風(fēng)電系統(tǒng)的諧波產(chǎn)生機(jī)理。采用對稱分量法和空間坐標(biāo)變換,對網(wǎng)壓、網(wǎng)流進(jìn)行建模;結(jié)合變換器功率平衡理論和迭代遞推法,推導(dǎo)得到變換器網(wǎng)側(cè)、直流側(cè)以及風(fēng)機(jī)轉(zhuǎn)子側(cè)、定子側(cè)低頻諧波的解析表達(dá)式;基于雙重傅里葉變換算法,建立變換器閉環(huán)傳遞函數(shù)的數(shù)學(xué)模型,結(jié)合迭代遞推法,實現(xiàn)變換器網(wǎng)側(cè)、直流側(cè)以及風(fēng)機(jī)轉(zhuǎn)子側(cè)的高頻諧波建模。最后,論文采用RTDS實時數(shù)字仿真平臺,搭建了基于背靠背式雙PWM變換器并網(wǎng)的雙饋風(fēng)電系統(tǒng)仿真模型,獲取了電網(wǎng)電壓三相平衡和不平衡狀態(tài)下的諧波數(shù)據(jù),并對諧波數(shù)據(jù)進(jìn)行了頻譜仿真。仿真結(jié)果與理論分析結(jié)果近乎完全吻合,由此驗證了理論分析的準(zhǔn)確性和可信性。
[Abstract]:Doubly-fed wind turbine based on doubly-fed Fed Induction generator generator is the mainstream equipment in wind power market in China. Back-to-back double PWM converter is the most widely used AC excitation converter in doubly-fed wind power system. It is a device to realize the frequency conversion between the rotor side of a doubly-fed fan and the power grid, and it is also the main harmonic source in the system. With the rapid development of wind power industry at home and abroad and the increasing installed capacity of wind turbine, Since the harmonic standard of wind power is improving continuously, it is of great theoretical significance to study the harmonic problem of double-fed wind power system based on grid-connected double PWM converters. The harmonic research status of wind power system and power electronic converter is summarized, and the characteristics and shortcomings of the existing research are analyzed. It is pointed out that the research on harmonic generation mechanism of doubly-fed wind power system is still scarce. It is necessary to establish a targeted harmonic research system. Firstly, the harmonic generation mechanism of doubly-fed wind power system under three-phase voltage balance is analyzed and studied. The characteristics of back-to-back double PWM converter and modulation mode are considered. Based on the theory of power balance, the low frequency harmonics of DC side and grid side are analyzed, and the high frequency harmonic modeling of rotor current is realized by using double Fourier transform algorithm. In this paper, the harmonic generation mechanism of wind power system under unbalanced grid voltage is further analyzed. The symmetrical component method and spatial coordinate transformation are used to model the network voltage and current, and combined with the power balance theory of the converter and iterative recursive method, the harmonic generation mechanism of wind power system is analyzed. The analytical expressions of low frequency harmonics on the grid side, DC side, rotor side and stator side of the converter are derived, the mathematical model of the closed-loop transfer function of the converter is established based on the dual Fourier transform algorithm, and the iterative recursive method is used to establish the mathematical model of the closed-loop transfer function of the converter. The high frequency harmonic modeling of converter grid side, DC side and fan rotor side is realized. Finally, the simulation model of doubly-fed wind power system based on back-to-back double PWM converter grid-connected is built by using RTDS real-time digital simulation platform. The harmonic data under the condition of three-phase voltage balance and unbalance of power network are obtained, and the harmonic data are simulated in the frequency spectrum. The simulation results are in close agreement with the theoretical analysis results, which verifies the accuracy and credibility of the theoretical analysis.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM614;TM711

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