發(fā)布時(shí)間：2018-04-20 12:03

  本文選題：雙饋感應(yīng)式風(fēng)力發(fā)電機(jī) + 低電壓穿越��； 參考：《中北大學(xué)》2014年碩士論文

【摘要】：隨著風(fēng)電裝機(jī)容量的不斷增加，，風(fēng)電系統(tǒng)與電網(wǎng)之間的相互影響也越來(lái)越大，其中風(fēng)電系統(tǒng)的故障穿越能力成為影響電網(wǎng)安全和穩(wěn)定運(yùn)行的重要因素之一。本文以目前廣泛應(yīng)用的雙饋風(fēng)力發(fā)電機(jī)作為研究對(duì)象，重點(diǎn)研究了雙饋風(fēng)電系統(tǒng)在電網(wǎng)故障下的穿越運(yùn)行，包括低電壓穿越（LVRT）和高電壓穿越（HVRT）。主要從改進(jìn)控制策略和增加硬件保護(hù)電路兩個(gè)方面進(jìn)行了研究，其中低電壓穿越包括對(duì)稱故障下的穿越和不對(duì)稱故障下的穿越。 針對(duì)雙饋感應(yīng)發(fā)電機(jī)（DFIG）的低電壓穿越，在數(shù)學(xué)建模和故障暫態(tài)分析的基礎(chǔ)上設(shè)計(jì)了對(duì)稱故障下的定、轉(zhuǎn)子變換器協(xié)同控制方法；設(shè)計(jì)了不對(duì)稱故障下DFIG網(wǎng)側(cè)變換器PD電流調(diào)節(jié)器控制策略和轉(zhuǎn)子變換器的PI-R電流調(diào)節(jié)器控制策略；設(shè)計(jì)了一種可統(tǒng)一應(yīng)用于對(duì)稱故障和不對(duì)稱故障的雙饋電機(jī)穩(wěn)態(tài)矢量控制暫態(tài)直接轉(zhuǎn)矩控制的控制方法。對(duì)常規(guī)的硬件保護(hù)Crowbar電路和Chopper電路，研究了其對(duì)于低電壓穿越的保護(hù)效果。 針對(duì)雙饋電機(jī)高電壓穿越，闡述了電壓升高的原因并對(duì)電壓驟升下的DFIG進(jìn)行了暫態(tài)分析；列舉了應(yīng)對(duì)高電壓穿越的改造思路，包括改進(jìn)控制策略，增加硬件保護(hù)Crowbar電路，增加風(fēng)電場(chǎng)無(wú)功補(bǔ)償裝置和超級(jí)電容的應(yīng)用；設(shè)計(jì)了DFIG高電壓穿越時(shí)網(wǎng)側(cè)變換器的控制思路和轉(zhuǎn)子側(cè)變換器的控制思路；設(shè)計(jì)了無(wú)功補(bǔ)償裝置（STATCOM）的控制方法。實(shí)際生產(chǎn)中若針對(duì)高、低電壓故障分別設(shè)計(jì)控制方法，則其控制的實(shí)用性會(huì)較差，對(duì)此本文得出結(jié)論應(yīng)該在低電壓穿越的同時(shí)考慮高電壓穿越，由一套控制方法應(yīng)對(duì)不同故障情況。電網(wǎng)故障程度較輕時(shí)控制策略改進(jìn)穿越而故障程度較深時(shí)則投入硬件保護(hù)電路實(shí)現(xiàn)穿越。 為了驗(yàn)證所設(shè)計(jì)的穿越方法和控制策略，在Matlab/Simulink上建立了一個(gè)1.5MW的雙饋感應(yīng)風(fēng)機(jī)模型，對(duì)其在低電壓故障和高電壓故障的情況進(jìn)行仿真。結(jié)果表明本文所設(shè)計(jì)的不同控制策略的正確性。
[Abstract]:With the increasing of wind power installed capacity, the interaction between wind power system and power grid is becoming more and more serious. Among them, the fault passing ability of wind power system becomes one of the important factors that affect the safe and stable operation of power grid. In this paper, the widely used doubly-fed wind turbine is taken as the research object, and the crossing operation of doubly-fed wind power system under the fault of power network is studied, including low voltage traversing LVRTT (low voltage traversing) and high voltage traversing HVRTT (HVRTT). In this paper, the improvement of control strategy and the increase of hardware protection circuit are studied. The low voltage traversing includes symmetric fault traversing and asymmetric fault traversing. Aiming at the low voltage traversing of DFIGs, based on mathematical modeling and fault transient analysis, a cooperative control method for stator and rotor converters with symmetric faults is designed. PD current regulator control strategy of DFIG grid-side converter and PI-R current regulator control strategy of rotor converter under asymmetric fault are designed. A control method for transient direct torque control (DTC) of doubly-fed machine based on steady-state vector control is designed, which can be applied to symmetric and asymmetric faults. The protection effect of conventional hardware protection Crowbar circuit and Chopper circuit for low voltage traversing is studied. In view of high voltage traversing of doubly-fed machine, the reason of voltage rise is expounded and transient analysis of DFIG under voltage sudden rise is carried out, and the retrofit ideas to deal with high voltage traversing are listed, including improving control strategy, adding hardware to protect Crowbar circuit. The application of reactive power compensator and super capacitor in wind farm is increased. The control thought of DFIG high voltage traversing grid-side converter and rotor side converter are designed. The control method of reactive power compensation device is designed. In actual production, if the control methods are designed separately for high and low voltage faults, the practicability of the control will be poor. In this paper, it is concluded that the high voltage traversing should be considered at the same time as low voltage traversing. A set of control methods is used to deal with different fault situations. The control strategy is improved when the fault degree is low and the crossing is realized by hardware protection circuit when the fault degree is deep. In order to verify the designed traversing method and control strategy, a double-fed induction fan model of 1.5MW is established on Matlab/Simulink, and the simulation is carried out in the case of low voltage fault and high voltage fault. The results show that the different control strategies designed in this paper are correct.
【學(xué)位授予單位】：中北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM315

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本文編號(hào)：1777665