【作者】 冯韬；

【导师】 姜久春；

【作者基本信息】 北京交通大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 消除电网谐波污染、提高功率因数是电力电子领域研究的重大课题。目前,大功率蓄电池充放电系统仍大量采用晶闸管的移相控制技术,该技术网侧功率因数低,对电网的污染大。本文提出了以三相电压型PWM整流器为核心的充放电系统,在实现能量双向流动的同时,实现网侧电流波形的正弦波控制,且网侧功率因数为±1。本文在推导三相电压型PWM整流器数学模型的基础上,从控制的角度出发,总结了目前对其研究的一些控制方案,并指出了各种控制方案的特点。继而确定了采用基于电压空间矢量PWM调制(SVPWM)的直接电流控制方法对三相电压型PWM整流器进行双闭环控制,文中详细推导了三相PWM整流器基于SVPWM的实时控制算法原理和计算过程,并在此基础上讨论了基于SVPWM前馈解耦的电流控制方法。文中建立了Matlab/Simulink环境下三相电压型PWM整流器、双向直直变换器的完整仿真模型,能准确地反映控制系统的特性。本文还提出了一整套基于DSP56F803控制系统的硬件、软件的解决方案,并对整个控制系统进行了试验,完成满负载的充电以及放电实验,验证了针对其应用而提出的控制方法和系统参数设计方法的正确性。更多还原

【Abstract】 Eliminating harmonic pollution and improving power factor are a very important research task in the field of power electronics. Silicon-controlled rectifiers (SCR) are widely used in Battery Charger/Discharger System at the present time. As we all know, SCR system has low power factor in grid side and causes severe harmonic pollution. A new solution of Battery Charger/Discharger System base on Voltage-source PWM Rectifier (VSR) is presented in this paper. It will implement bidirectional power flow, sinusoidal current control and unit power factor control in grid side as well. On the basis of deriving the VSR’s mathematical model, the MATLAB simulation model is achieved, control strategies of VSR are summarized and their features are pointed out. The feedforward and decoupling control, based on active and reactive current, as a kind of direct current control strategy, is selected by comparing with other ways in this paper. The voltage space vector (SVPWM) is selected as the PWM method, its theory and computing steps are described in detail in this paper. The whole simulation module of control system is built up under the powerful MATLAB/SIMULINK platform, it can precisely reflect the system properties. A full solution of hardware and software design of VSR control system base on DSP56F803 is presented in detail in this paper. Experiment of full-load of the system also testified that the use of three-phase VSR in Battery Charger/Discharger System is available.更多还原