基于PWM整流器的功率控制器的仿真研究

文章研究了一种基于PWM整流器的功率控制器。由三相电压型整流器在三相静止坐标系中的数学模型,导出其在两相旋转坐标系的数学模型,并在此基础上引入了基于电网电压前馈解耦的三相PWM整流器控制系统,实现对于有功电流和无功电流的单独控制,从而达到对于有功、无功功率控制的目的。     

三相电流型整流器空间矢量调制仿真研究

相对于传统的电压型PWM整流器而言,电流型PWM整流器用于电机驱动具有动态响应快,便于实现再生制动和四象限运行,限流能力强,短路保护可靠性高,能在宽范围内精确控制转矩和速度等优点,在小、中等功率得到广泛的应用。利用三相电压型整流器（VSR）的电压空间矢量调制技术（SVM）实现三相电流型整流器（CSR）的三逻辑空间矢量调制,对其数学模型进行了推导,并利用Matlab建立了系统的仿真模型。仿真结果证明了该方法的有效性,实现了电流型整流器交流侧的单位功率因数和直流侧电流的平稳运行,对电力无功补偿和谐波抑制具有很好的效果。     

电子元件、组件

TM42006020487设置扇形边界死区的电压型PWM整流器直接功率控制/王久和,李华德,杨立永(北京科技大学信息工程学院)//北京科技大学学报.―2005,27(3).―380～384.利用电压型PWM整流器的数学模型分析了PWM整流器直接功率控制(DPC)的原理,讨论了功率滞环比较器环宽对PWM整流器的影     

基于虚拟电网磁链定向的三电平PWM整流器矢量控制研究

为实现无网侧电压传感器的三电平PWM整流器控制,在分析三电平PWM整流器数学模型的基础上,采用一种新颖的虚拟磁链观测器,提出了基于虚拟电网磁链定向的三电平PWM整流器矢量控制策略,在双三电平变频器系统中对其进行了实验研究。实验结果表明,该控制系统可提高整流器功率因数,并具有良好的动静态特性。     

三相PWM整流器及其控制策略的研究

减少电网谐波污染、提高电力整流装置的功率因数是电力电子研究领域的重要组成部分。三相电压型PWM整流器具有输出电压恒定、能实现单位功率因数运行的特点,甚至可以实现电能回馈电网。因此对三相PWM整流器的开关控制策略进行深入研究具有很重要的现实意义。本文主要研究基于虚拟磁链的直接功率控制和直接电流控制这两种关于PWM整流器的控制策略。     

风力发电中三相电压型PWM整流器的研究

通过分析三相电压型PWM整流器的数学模型,建立了PWM整流器在两相旋转坐标系下的数学模型。研究了电压电流双闭环控制策略。基于空间矢量的思想,设计了三相电压型PWM整流器在Matlab/Simulink中的仿真模型。仿真结果表明,此控制方法有效可行。     

单相PWM整流器直接电流控制策略的仿真研究

本文以单相两电平PWM整流器为研究对象,根据其工作原理,建立了基于理想开关函数的PWM整流器主电路数学模型,进而通过该模型搭建了仿真框架。在Matlab/Simulink仿真环境下,对比研究了瞬态直流电流控制和预测直接电流控制两种控制策略在PWM整流器中的控制性能。仿真结果表明,两种控制策略均可以使得单相两电平PWM整流器具有良好的稳定性和动态响应。     

IR推出新型HOSFET

国际整流器公司（IR）日前发布了最新的HEXFET系列N沟道型功率MOSFET,该产品具有较低的通态电阻（RDS（on））,采用TO-247封装,其典型应用包括：同步整流、有源ORing、大功率直流电机驱动,直-交逆变器、电动工具等。     

基于空间电压矢量的三相电压型PWM整流器的研究

建立了三相电压型PWM整流器在三相静止坐标系和两相同步旋转坐标系下的数学模型,将双闭环工程设计方法应用于PWM整流器,研究了其前馈解耦控制策略。在此基础上结合空间矢量调制（SVPWM）的算法,设计了三相电压型PWM整流器控制系统,并在Matlab的Simulink中进行了系统仿真。仿真结果表明,设计方法可行,具有良好的动静态性能,实现了单位功率因数。     

大功率IGCT变换器的几个问题

本文讨论人功率IGCT变换器的几个问题：三电平变换电路中的钳位电阻的作用；IGCT逆变器的过流保护和短路保护；IGCT变换器的输出容量与开关频率和输出频率的关系；在有源整流器中采用SHEPWM方法生成PWM信号。     

输入滤波对直流分布式电源系统稳定性影响的研究

分布式供电直流变换器与逆变器级联系统具有很强的时变和非线性特性,级联式DC/DC变换器的稳定性是分布式供电系统中的重要问题。文中重点以DC/DC变换器与DC/AC逆变器连接为例分析逆变器输入滤波对系统稳定性的影响。通过实验验证,在逆变器侧串联LC滤波器,利于系统稳定。     

Recent developments of high power converters for industry andtraction applications

The introduction of new high power devices like integrated gate commutated thyristors (IGCTs) and high voltage insulated gate bipolar transistors (IGBTs) accelerates the broad use of pulse width modulation (PWM) voltage source converters in industrial and traction applications. This paper summarizes the state-of-the-art of power semiconductors. The characteristics of IGCTs and high voltage IGBTs are described in detail. Both the design and loss simulations of a two level 1.14 MVA voltage source inverter and a 6 MVA three-level neutral point clamped voltage source converter with active front end enable a detailed comparison of both power semiconductors for high power PWM converters. The design and the characteristics of a commercially available IGCT neutral point clamped PWM voltage source converter for medium voltage drives are discussed. Recent developments and trends of traction converters at DC mains and AC mains are summarized     

Advanced Control and Analysis of Cascaded Multilevel Converters Based on P-Q Compensation

This paper introduces new controls for the cascaded multilevel power converter. This converter is also sometimes referred to as a ldquohybrid converterrdquo since it splits high-voltage/low-frequency and low-voltage/pulsewidth-modulation (PWM)-frequency power production between ldquobulkrdquo and ldquoconditioningrdquo converters respectively. Cascaded multilevel converters achieve higher power quality with a given switch count when compared to traditional multilevel converters. This is a particularly favorable option for high power and high performance applications such as naval ship propulsion. This paper first presents a new control method for the topology using three-level bulk and conditioning inverters connected in series through a three-phase load. This control avoids PWM frequency switching in the bulk inverter. The conditioning inverter uses a capacitor source and its control is based on compensating the real and reactive (P-Q) power difference between the bulk inverter and the load. The new control explicitly commands power into the conditioning inverter so that its capacitor voltage remains constant. A unique space vector analysis of hybrid converter modulation is introduced to quantitatively determine operating limitations. The conclusion is then generalized for all types of controls of the hybrid multilevel converters (involving three-level converter cells). The proposed control methods and analytical conclusions are verified by simulation and laboratory measurements.     

变频技术在风电设备中的应用

主要围绕变频技术在风电设备中的应用展开研究,以变速恒频双馈风力发电机为研究对象。对发电系统中交流励磁控制方式常见的变频装置进行了比较分析,对选择的双PWM变换器交流励磁变速恒频风力发电系统的两个控制单元——网侧PWM变换器和转子侧PWM变换器进行了控制策略分析及仿真。     

交流电动机传动用电压源逆变器损耗的分析

整流器与逆变器是工业变频器中重要的两种变换器,其功率损耗的大小决定于变换器的调制算法、传动系统的负载特性与运行方式等因素,而变换器的功率器件功耗大小又决定了整个变频器的效率、散热处理、安全运行等方面。本文理论推导了普通SPWM、谐波注入PWM、损耗最小PWM、常规SVPWM、以及共模电压抑制时电压源逆变器中功率器件功耗的计算公式,所得结果均得到了仿真分析验证。以22kW工业变频器100A IGBT和SPWM算法为例,进行了初步模拟计算。所推导的功耗计算公式对实际逆变器散热设计具有一定的参考价值。     

Analysis and Simulation of a High Performance Quasi Resonant PWM Inverter for Solar Power Generation

A quasi resonant pulse width modulation (PWM) inverter is used in a solar power system to convert the solar panel and battery charger's direct current (DC) output to alternating current (AC). Although much has been published about DC to AC PWM inverters, none of the previous work has shown modeling and simulation results for DC to AC inverters. In this study, we suggest a new topology for a quasi resonant PWM inverter. Experimental results are also presented.     

牵引变流器

本文介绍了目前高速铁路牵引变流器的情况和存在的问题。提出了采用直流/多交流变换器（这实际是共直流母线的逆变器）代替现有的牵引变流器,并实现以直流牵引网为媒介组成全国统一电网的构想。     

Control of Single-Phase-to-Three-Phase AC/DC/AC PWM Converters for Induction Motor Drives

This paper proposes a novel control scheme of single-phase-to-three-phase pulsewidth-modulation (PWM) converters for low-power three-phase induction motor drives, where a single-phase half-bridge PWM rectifier and a two-leg inverter are used. With this converter topology, the number of switching devices is reduced to six from ten in the case of full-bridge rectifier and three-leg inverter systems. In addition, the source voltage sensor is eliminated with a state observer, which controls the deviation between the model current and the system current to be zero. A simple scalar voltage modulation method is used for a two-leg inverter, and a new technique to eliminate the effect of the dc-link voltage ripple on the inverter output current is proposed. Although the converter topology itself is of lower cost than the conventional one, it retains the same functions such as sinusoidal input current, unity power factor, dc-link voltage control, bidirectional power flow, and variable-voltage and variable-frequency output voltage. The experimental results for the V/f control of 3-hp induction motor drives controlled by a digital signal processor TMS320C31 chip have verified the effectiveness of the proposed scheme     

Symbolic analysis methods for averaged modeling of switching powerconverters

Symbolic analysis methods for the averaged modeling of switching power converters are presented in this paper. A general averaging method suitable for computer-aided modeling is discussed first. Then, a symbolic analysis package that uses this averaging method to automatically generate an analytical averaged model for a switching power converter is described. The package is implemented using the computer algebra system Mathematica and can be used for modeling DC/DC power converters employing different switching techniques, including hard-switching pulse-width modulation (PWM), quasi-resonant soft switching, and soft transition. Several examples are provided to demonstrate the applications of the package. Further applications of symbolic analysis methods in power electronics are also discussed     

Solar power generation system for reducing leakage current

This paper proposes a transformer-less multi-level solar power generation system. This solar power generation system is composed of a solar cell array, a boost power converter, an isolation switch set and a full-bridge inverter. A unipolar pulse-width modulation (PWM) strategy is used in the full-bridge inverter to attenuate the output ripple current. Circuit isolation is accomplished by integrating the isolation switch set between the solar cell array and the utility, to suppress the leakage current. The isolation switch set also determines the DC bus voltage for the full-bridge inverter connecting to the solar cell array or the output of the boost power converter. Accordingly, the proposed transformer-less multi-level solar power generation system generates a five-level voltage, and the partial power of the solar cell array is also converted to AC power using only the full-bridge inverter, so the power efficiency is increased. A prototype is developed to validate the performance of the proposed transformer-less multi-level solar power generation system.