發(fā)布時(shí)間：2018-03-28 13:26

  本文選題：雙饋風(fēng)力發(fā)電系統(tǒng)　切入點(diǎn)：矢量控制　出處：《電子科技大學(xué)》2017年碩士論文

【摘要】：風(fēng)力發(fā)電是目前利用新能源發(fā)電的重要部分之一,其中以基于雙饋感應(yīng)電機(jī)(Doubly-Fed Induction Generator,DFIG)的風(fēng)力發(fā)電系統(tǒng)為主。本文的主要研究?jī)?nèi)容是雙饋風(fēng)力發(fā)電系統(tǒng)在非理想電網(wǎng)條件下的控制策略研究,其中非理想電網(wǎng)條件包括電網(wǎng)電壓驟降,諧波電壓以及不平衡電壓,主要研究?jī)?nèi)容和結(jié)論如下:(1)分別建立三相靜止坐標(biāo)系和兩相同步旋轉(zhuǎn)坐標(biāo)系下單質(zhì)量體風(fēng)力機(jī),雙饋電機(jī)和背靠背PWM變流器數(shù)學(xué)模型,在此基礎(chǔ)上,選擇定子、轉(zhuǎn)子和網(wǎng)側(cè)變流器輸入電流為狀態(tài)變量,機(jī)端電壓與轉(zhuǎn)子電壓為輸入變量,建立全階雙饋風(fēng)力發(fā)電系統(tǒng)矩陣模型;最后分析了雙饋風(fēng)力發(fā)電系統(tǒng)功率關(guān)系。(2)在PLECS中搭建2MW雙饋風(fēng)電系統(tǒng)并在非理想電網(wǎng)條件下進(jìn)行仿真分析,結(jié)果顯示傳統(tǒng)矢量控制策略下,當(dāng)電網(wǎng)電壓最大跌落至正常值得20%時(shí),轉(zhuǎn)子電流脈沖將達(dá)到正常值的3倍左右,功率脈動(dòng)與電磁轉(zhuǎn)矩脈動(dòng)幅值將達(dá)到2倍左右;電網(wǎng)電壓諧波導(dǎo)致DFIG輸出電流畸變,功率、轉(zhuǎn)速以及電磁轉(zhuǎn)矩出現(xiàn)高頻振蕩,不平衡電壓導(dǎo)致DFIG輸出電流發(fā)生更大的不平衡度,功率、轉(zhuǎn)速以及電磁轉(zhuǎn)矩出現(xiàn)100Hz振蕩。(3)針對(duì)電網(wǎng)電壓驟降,通過設(shè)計(jì)改進(jìn)轉(zhuǎn)子側(cè)變流器控制算法與直流Crowbar結(jié)合的方式,該方法能夠抑制50%左右的轉(zhuǎn)子瞬態(tài)過電壓,40%左右的瞬態(tài)功率脈沖以及電磁轉(zhuǎn)矩脈沖。針對(duì)電網(wǎng)電壓諧波情況,設(shè)計(jì)改進(jìn)鎖相環(huán)算法在諧波情況下準(zhǔn)確快速提取電網(wǎng)電壓相位;基于LCL型三相逆變器設(shè)計(jì)諧波電壓補(bǔ)償算法,通過仿真驗(yàn)證該方法保證了DFIG定子端電壓為理想正弦,從根本上消除了電網(wǎng)諧波對(duì)DFIG風(fēng)電機(jī)組的影響。針對(duì)不平衡電壓情況,基于改進(jìn)鎖相環(huán)設(shè)計(jì)各相電壓跌落幅值提取算法,并設(shè)計(jì)了不平衡電壓補(bǔ)償算法平衡雙饋電機(jī)機(jī)端電壓,通過仿真分析可以得到,該控制策略可以使機(jī)端電壓在電網(wǎng)電壓不平衡發(fā)生后25ms內(nèi)恢復(fù)正常,實(shí)現(xiàn)風(fēng)力發(fā)電系統(tǒng)在不平衡電壓下的正常運(yùn)行。(4)設(shè)計(jì)三相LCL型逆變器實(shí)驗(yàn)平臺(tái),通過阻性負(fù)載驗(yàn)證該實(shí)驗(yàn)平臺(tái)的有效性,在非線性負(fù)載條件下研究了諧波控制算法;最后用逆變器模擬了DFIG風(fēng)電系統(tǒng)轉(zhuǎn)子側(cè)變流器輸出特性,通過仿真與實(shí)驗(yàn)對(duì)比的方式證明了該三相逆變器實(shí)驗(yàn)平臺(tái)能夠有效的模擬次同步、超同步穩(wěn)態(tài)過程以及DFIG運(yùn)行狀態(tài)轉(zhuǎn)變的變化過程。
[Abstract]:Wind power generation is one of the most important parts of power generation using new energy. The wind power generation system based on Doubly-Fed Induction Generator (DFIGG) is mainly used in this paper. The main content of this paper is to study the control strategy of doubly-fed wind power generation system under non-ideal power grid conditions, including the voltage drop of power grid. The main contents and conclusions of harmonic voltage and unbalanced voltage are as follows: (1) the mathematical models of three-phase static coordinate system and two-phase synchronous rotating coordinate system are established, respectively, for bulk wind turbine, double-fed wind turbine and back-to-back PWM converter. The input current of stator, rotor and grid side converter is selected as the state variable, the terminal voltage and rotor voltage are selected as input variables, and the matrix model of full-class doubly-fed wind power generation system is established. Finally, the power relationship of doubly-fed wind power generation system is analyzed. The 2MW doubly-fed wind power system is built in PLECS and simulated under the condition of non-ideal power grid. The results show that the traditional vector control strategy is used. When the maximum voltage drop to normal value is worth 20, the rotor current pulse will reach about 3 times the normal value, the amplitude of power ripple and electromagnetic torque ripple will reach about 2 times. Rotating speed and electromagnetic torque appear high frequency oscillation, unbalanced voltage leads to greater imbalance of DFIG output current, power, speed and electromagnetic torque appear 100Hz oscillation. By designing and improving the control algorithm of rotor side converter combined with DC Crowbar, the method can suppress about 50% transient overvoltage of rotor and 40% of transient power pulse and electromagnetic torque pulse. The improved phase-locked loop algorithm is designed to accurately and quickly extract the voltage phase of the power network under the condition of harmonics, and the harmonic voltage compensation algorithm based on LCL three-phase inverter is designed. The simulation results show that the terminal voltage of the DFIG stator is an ideal sinusoidal voltage. The influence of power grid harmonic on DFIG wind turbine is eliminated fundamentally. In view of the unbalanced voltage, the algorithm of extracting the drop amplitude of each phase voltage based on the improved phase-locked loop is designed, and the unbalanced voltage compensation algorithm is designed to balance the terminal voltage of the double-fed machine. Through simulation analysis, it can be concluded that the control strategy can make the terminal voltage return to normal in 25ms after the voltage imbalance occurs, and realize the normal operation of wind power system under unbalanced voltage. (4) the three-phase LCL inverter experimental platform is designed. The effectiveness of the experimental platform is verified by resistive load, and harmonic control algorithm is studied under nonlinear load. Finally, the output characteristics of rotor side converter of DFIG wind power system are simulated by inverter. The comparison between simulation and experiment proves that the experimental platform of three-phase inverter can effectively simulate the process of sub-synchronization, supersonic steady state and the change of DFIG operation state.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM614

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