本文選題：永磁直驅(qū) + NPC型三電平變流器��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：與雙饋式風(fēng)力發(fā)電系統(tǒng)相比，永磁直驅(qū)式風(fēng)力發(fā)電系統(tǒng)中風(fēng)機(jī)直接與發(fā)電機(jī)相連，無需齒輪箱，成本降低，并網(wǎng)控制靈活，風(fēng)力發(fā)電的整體效率得到有效提高，成為風(fēng)力發(fā)電技術(shù)的研究熱點(diǎn)之一。全功率變流器是直驅(qū)風(fēng)電系統(tǒng)的核心部分，它能夠及時(shí)將發(fā)電機(jī)輸出的電能輸送至電網(wǎng)。隨著風(fēng)電技術(shù)的發(fā)展，現(xiàn)有風(fēng)電系統(tǒng)對(duì)器件耐壓水平和功率等級(jí)的要求也越來越高。三電平變流器因其能夠降低諧波含量、提高功率等級(jí)、改善系統(tǒng)工作效率，在直驅(qū)風(fēng)電系統(tǒng)中應(yīng)用比較廣泛。本論文對(duì)基于雙NPC型三電平變流器的永磁直驅(qū)風(fēng)電系統(tǒng)繼續(xù)研究。 分析風(fēng)力機(jī)的動(dòng)力學(xué)特性和運(yùn)行特性，研究槳距角、葉尖速比、風(fēng)能利用系數(shù)和輸出轉(zhuǎn)矩等物理特性，繪制出最優(yōu)功率曲線；在同步旋轉(zhuǎn)坐標(biāo)軸系中，建立永磁同步電機(jī)的數(shù)學(xué)模型，分析其穩(wěn)態(tài)特性和功角特性； 根據(jù)SVPWM調(diào)制的基本原理，重點(diǎn)研究基于參考電壓矢量分解的三電平SVPWM調(diào)制算法，用兩電平參考矢量和兩電平基本矢量共同作用的效果來代替三電平電壓矢量的單獨(dú)作用，達(dá)到矢量合成的目的； 根據(jù)三電平變流器的運(yùn)行原理，，建立機(jī)側(cè)整流器和網(wǎng)側(cè)逆變器的數(shù)學(xué)模型并推導(dǎo)其電壓控制方程；對(duì)機(jī)側(cè)整流器采用轉(zhuǎn)子磁場定向的控制策略，通過調(diào)節(jié)定子電流分量對(duì)電磁轉(zhuǎn)矩進(jìn)行控制，從而達(dá)到調(diào)節(jié)發(fā)電機(jī)轉(zhuǎn)速的目的；對(duì)網(wǎng)側(cè)逆變器采用電網(wǎng)電壓定向的控制策略，調(diào)節(jié)網(wǎng)側(cè)電流分量達(dá)到對(duì)逆變器輸出有功功率和無功功率獨(dú)立控制的目的； 重點(diǎn)針對(duì)NPC型三電平變流器的固有問題—直流側(cè)中點(diǎn)電位波動(dòng)進(jìn)行研究，以調(diào)制過程中作用的各個(gè)基本矢量為切入點(diǎn)，對(duì)產(chǎn)生電位波動(dòng)的根本原因進(jìn)行分析，并充分利用作用矢量的冗余狀態(tài)，提出基于實(shí)時(shí)電流檢測的中點(diǎn)電位平衡控制策略；最后，結(jié)合機(jī)側(cè)和網(wǎng)側(cè)變流器的控制，建立了永磁直驅(qū)風(fēng)電系統(tǒng)的整體控制策略；采用Matlab軟件搭建系統(tǒng)仿真模型，通過仿真驗(yàn)證了控制策略的正確性和有效性。
[Abstract]:Compared with the doubly-fed wind power generation system, the wind turbine is connected directly to the generator in the permanent magnet direct drive wind power generation system, the cost is reduced, the grid control is flexible, and the overall efficiency of wind power generation is improved effectively. It has become one of the research hotspots in wind power generation technology. Full power converter is the core part of direct drive wind power system. With the development of wind power technology, the requirements of the current wind power system for the device voltage level and power level are becoming higher and higher. Three-level converter is widely used in direct drive wind power system because it can reduce harmonic content, improve power level and improve system efficiency. In this paper, we continue to study the permanent magnet direct drive wind power system based on the dual-NPC three-level converter, analyze the dynamic and operational characteristics of the wind turbine, study the physical characteristics of pitch angle, tip speed ratio, wind energy utilization coefficient and output torque, etc. The optimal power curve is drawn, the mathematical model of permanent magnet synchronous motor is established in the synchronous rotation coordinate system, the steady state characteristic and power angle characteristic of permanent magnet synchronous motor are analyzed, according to the basic principle of SVPWM modulation, The three-level SVPWM modulation algorithm based on reference voltage vector decomposition is studied. The effect of two-level reference vector and two-level basic vector is used to replace the three-level voltage vector. According to the operation principle of the three-level converter, the mathematical model of the rectifier and grid-side inverter is established and its voltage control equation is deduced, and the rotor field-oriented control strategy is adopted for the motor side rectifier. By adjusting the stator current component to control the electromagnetic torque to achieve the purpose of regulating the speed of the generator, the grid voltage oriented control strategy is adopted for the grid-side inverter. Regulating the current component of the grid side to achieve the purpose of independent control of the output active power and reactive power of the inverter, focusing on the inherent problem of NPC three-level converter, namely, the fluctuation of neutral point potential at the DC side. Based on the basic vectors in the modulation process, this paper analyzes the fundamental causes of the potential fluctuations, and makes full use of the redundant state of the action vectors, and puts forward the midpoint potential balance control strategy based on real-time current detection. The overall control strategy of the permanent magnet direct drive wind power system is established by combining the control of the converter on the machine side and the grid side, and the simulation model of the system is built with Matlab software, and the correctness and effectiveness of the control strategy are verified by simulation.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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