毕业论文--电气.doc

基于脉宽调制技术的变频电源设计 摘要 我国是一个电力资源非常短缺的国家，逆变技术作为一种高效节能技术，势必对国民经济的发展具有深远的影响。鉴于传统的SPWM控制技术不能充分地利用逆变器直流侧的直流电压，输出波形谐波含量较多等不利因素，本文提出了将具有谐波小、直流电压利用率高、算法简单、规律性强、易于数字化实现特点的电压空间矢量脉宽调制(SVPWM)技术应用到高效节能的变频器中，对三相桥式电压型逆变器进行了研究分析，分别建立了在三种坐标系下逆变器交流侧的数学模型。通过采用电压电流双闭环控制实现了在两相同步旋转坐标系下对三相逆变器的电流静态解耦，有效的改善逆变工程中的动态响应及抗扰能力，实现了对逆变器的可靠稳定控制。随后在SVPWM控制技术基本原理的基础上，对其法则和控制算法进行了推导研究，通过对控制算法的简单优化改造，避免了非线性函数的复杂计算，同时对SVPWM的调制波函数进行了推导，使其隐含的相电压调制波显化，并结合三相PWM逆变器静态解耦模型建立了基于SVPWM控制策略的变频器控制总体结构图，为仿真实现提供了参考依据。最后利用SIMULINK动态仿真工具实现SVPWM控制算法的动态仿真，在此基础上建立了基于SVPWM控制的三相电压型逆变系统的仿真模型，并对这种控制的仿真结果做了详细分析，仿真结果达到了预期效果。这就使得SVPWM控制技术在逆变节能方面具有非常广阔的应用前景。希望能够对我国节能减排产生积极的推动作用，缓解能源短缺的压力，提高经济效益。 关键词：SVPWM，电压型逆变器，SIMULINK仿真 THE DESIGN OF VOLTAGE VARIABLE FREQUENCY POWER BASED ON THE SVPWM ABSTRACT Our country is short of power resources. Inverter technology ,which is a kind of high energy efficiency technology, will have a profound impact for the development of the national economy. In view of the traditional SPWM control technology cannot fully uses the dc voltage of the dc side of output ,and much of useless harmonic waveform content, these are negative factors foq the inverters. So this paper put forward the voltage space vector pulse width modulation (SVPWM) with the features of the small harmonic, dc voltage with high efficiency and simple algorithm, strong regularity, easy digital realization ,and this technology is applied to energy-efficient inverter. The three-phase voltage source inverter is analyzed respectively ,and establish the mathematical model in three coordinates of the ac inverter. Through adopting voltage-current double closed loop control ,the two phase synchronization reference frame of three-phase inverter is realized under the current static decoupling. So it improve the dynamic response and inverter engineering crosstalk resistant ability, And the highly reliable control of the inverter is realized. Then the control algorithm are also deduced research in SVPWM control technology based on