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

【摘要】：與雙饋式風力發(fā)電系統(tǒng)相比，永磁直驅式風力發(fā)電系統(tǒng)中風機直接與發(fā)電機相連，無需齒輪箱，成本降低，并網(wǎng)控制靈活，風力發(fā)電的整體效率得到有效提高，成為風力發(fā)電技術的研究熱點之一。全功率變流器是直驅風電系統(tǒng)的核心部分，它能夠及時將發(fā)電機輸出的電能輸送至電網(wǎng)。隨著風電技術的發(fā)展，現(xiàn)有風電系統(tǒng)對器件耐壓水平和功率等級的要求也越來越高。三電平變流器因其能夠降低諧波含量、提高功率等級、改善系統(tǒng)工作效率，在直驅風電系統(tǒng)中應用比較廣泛。本論文對基于雙NPC型三電平變流器的永磁直驅風電系統(tǒng)繼續(xù)研究。 分析風力機的動力學特性和運行特性，研究槳距角、葉尖速比、風能利用系數(shù)和輸出轉矩等物理特性，繪制出最優(yōu)功率曲線；在同步旋轉坐標軸系中，建立永磁同步電機的數(shù)學模型，分析其穩(wěn)態(tài)特性和功角特性； 根據(jù)SVPWM調制的基本原理，重點研究基于參考電壓矢量分解的三電平SVPWM調制算法，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作用，達到矢量合成的目的； 根據(jù)三電平變流器的運行原理，，建立機側整流器和網(wǎng)側逆變器的數(shù)學模型并推導其電壓控制方程；對機側整流器采用轉子磁場定向的控制策略，通過調節(jié)定子電流分量對電磁轉矩進行控制，從而達到調節(jié)發(fā)電機轉速的目的；對網(wǎng)側逆變器采用電網(wǎng)電壓定向的控制策略，調節(jié)網(wǎng)側電流分量達到對逆變器輸出有功功率和無功功率獨立控制的目的； 重點針對NPC型三電平變流器的固有問題—直流側中點電位波動進行研究，以調制過程中作用的各個基本矢量為切入點，對產生電位波動的根本原因進行分析，并充分利用作用矢量的冗余狀態(tài)，提出基于實時電流檢測的中點電位平衡控制策略；最后，結合機側和網(wǎng)側變流器的控制，建立了永磁直驅風電系統(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.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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本文編號：2005353