【摘要】：隨著全球能源危機的加劇和人們環(huán)保意識的增強，可再生能源的利用倍受重視，其中風力發(fā)電因其相關(guān)技術(shù)成熟、可規(guī)模開發(fā)等特點而得到較快發(fā)展。傳統(tǒng)的風力發(fā)電機為雙饋感應發(fā)電機，因其具有復雜的勵磁系統(tǒng)和齒輪變速箱而限制了其應用和發(fā)展。本文中設計的風力發(fā)電機使用永磁體勵磁，并采用直接驅(qū)動方式。這種直驅(qū)永磁風力發(fā)電機使風力發(fā)電系統(tǒng)大為簡化，提高了發(fā)電機的運行穩(wěn)定性和發(fā)電效率。 本文根據(jù)直驅(qū)永磁發(fā)電機區(qū)別于傳統(tǒng)發(fā)電機的新結(jié)構(gòu)特點、設計特點和運行特點，采用了分數(shù)槽的極槽配合來設計直驅(qū)永磁發(fā)電機，并結(jié)合使用了雙層疊繞組，獲得了正弦性很好的發(fā)電波形，，有效地降低了齒槽轉(zhuǎn)矩。在有限元軟件的二維電磁場中建立了發(fā)電機模型和外電路模型，并對其進行了空載、額定負載、三相短路狀況下的運行性能分析，驗證了本電磁設計的合理性。并結(jié)合分析結(jié)果計算了功率因數(shù)、漏磁系數(shù)和電抗參數(shù)。本文還對不同的極槽配合進行對比分析，從中選取了最優(yōu)方案，使得感應電動勢諧波畸變率最小，齒槽轉(zhuǎn)矩最小。 重點研究了直驅(qū)永磁風力發(fā)電機退磁風險分析。探究了分數(shù)槽永磁發(fā)電機的退磁特點和分析方法，通過對短路時轉(zhuǎn)子初始角參數(shù)化，尋找到退磁風險最大的時刻，并進一步對磁極不同表面深度處磁密進行分析，確定了最大退磁風險點的位置。研究還得到了A相軸線與d軸夾角θ0從0到90變化過程中磁極磁密曲線變化趨勢，探究了磁極外表面前、后兩端點處的磁密大小變化過程，從而得到了磁密曲線畸變規(guī)律和最大退磁風險點的移動趨勢。
[Abstract]:With the aggravation of the global energy crisis and the enhancement of people's awareness of environmental protection, the utilization of renewable energy has been paid more attention, among which wind power has been developed rapidly because of its mature technology and scale development. The traditional wind turbine is a doubly-fed induction generator. Its application and development are limited by its complicated excitation system and gear gearbox. The wind turbine designed in this paper uses permanent magnet excitation and adopts direct drive mode. The direct-drive permanent magnet wind turbine greatly simplifies the wind power generation system and improves the stability and efficiency of the generator. According to the new structure characteristic, design characteristic and operation characteristic of direct-drive permanent magnet generator which is different from traditional generator, this paper adopts the pole slot coordination of fractional slot to design direct-drive permanent magnet generator, and uses double layer stacked windings. The sinusoidal waveform is obtained and the torque of the tooth slot is reduced effectively. The generator model and the external circuit model are established in the two-dimensional electromagnetic field of the finite element software, and the operating performance of the generator is analyzed under the condition of no-load, rated load and three-phase short circuit, which verifies the rationality of the electromagnetic design. The power factor, flux leakage coefficient and reactance parameters are calculated based on the analysis results. By comparing and analyzing the different pole-slot coordination, the optimal scheme is selected, which makes the harmonic distortion rate of induction electromotive force minimum and the torque of tooth slot minimum. The risk analysis of direct drive permanent magnet wind turbine demagnetization is studied. The demagnetization characteristics and analysis method of fractional slot permanent magnet generator are studied. By parameterizing the initial angle of the rotor during short circuit, the maximum demagnetization risk is found, and the magnetic density at different surface depth of magnetic pole is further analyzed. The location of the maximum demagnetization risk point is determined. The change trend of magnetic density curve of magnetic pole during the change of angle 胃 0 between phase A axis and d axis from 0 to 90 is also obtained, and the change process of magnetic density at the front of the magnetic pole and at the point at the end of the pole is investigated. The distortion law of magnetic density curve and the movement trend of maximum demagnetization risk point are obtained.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM315

【引證文獻】

相關(guān)碩士學位論文 前3條

1 劉天知;750kW觀光艇推進用混合永磁同步電動機研究[D];湖北工業(yè)大學;2016年

2 蘇斌;浮體繩輪波浪發(fā)電機的研究[D];山東大學;2015年

3 練正兵;兆瓦級高速永磁同步風力發(fā)電機電磁設計及溫度場分析[D];上海電機學院;2015年

本文編號：2164967