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。     

三相PWM整流器的前馈解耦控制与仿真研究

基于前馈解耦控制策略,研究了三相电压型PWM整流器的建模与控制问题。首先,在d-q旋转坐标系下建立了三相电压型PWM整流器的数学模型,给出了三相电压型PWM整流器的双闭环控制结构,按此方法确定了电压、电流PI调节器的设计方法。仿真结果表明该方法能使所设计的PWM整流器运行于单位功率因数,输出的直流电压稳定在期望值且具有快速的动态响应,满足了设计要求。     

电网不平衡条件下三相电压型PWM整流器非线性控制研究

本文提出了一种电网不平衡条件下三相电压型PWM整流器的控制方法。首先,建立了三相电压型PWM整流器的数学模型,基于网侧单位功率因数及负载电压恒定的控制目标,建立了网侧电流给定方程组。其次,基于“三相不平衡abc静止坐标系”与“不平衡坐标变换”建立的dq解耦模型,采用输入-输出线性化的电流控制策略,实现了有功电流与无功电流的独立控制。仿真实验结果表明：文中所提出的控制策略是有效的。     

基于DSP的三相PWM整流PI调节器设计

通过分析三相脉宽调制（PWM）整流器在a-b-c及d-q旋转坐标系下的数学模型,设计了具有前馈解耦控制的PWM整流器双闭环控制系统。根据系统对电流内环及电压外环的控制要求设计了电流比例积分（PI）调节器及电压PI调节器。最后对整个PWM整流器双闭环控制系统进行仿真,并采用以DSP为核心构建PWM整流器控制系统,仿真和实验结果验证了PI调节器设计的正确性。     

基于matlab的三相电压型PWM整流器的仿真研究

建立了三相电压型PWM整流器在三相静止坐标系和两相旋转坐标系下的数学模型,研究了基于空间矢量的控制策略。在此基础上设计了三相电压型PWM整流器控制系统,并在Matlab中进行了系统仿真。仿真结果表明,设计方法可行,仿真模型正确。     

基于两相静止坐标系三相电压型PWH整流器控制策略的研究

本文研究了基于两相静止坐标系中的三相电压源型PWM整流器的控制方案,引入广义积分器实现三相电流在两相静止坐标系下跟踪控制。仿真结果证明了文中所提出的控制策略的有效性和可行性。     

基于两相静止坐标系三相电压型PWM整流器控制策略的研究

本文研究了基于两相静止坐标系中的三相电压源型PWM整流器的控制方案,引入广义积分器实现三相电流在两相静止坐标系下跟踪控制。仿真结果证明了文中所提出的控制策略的有效性和可行性。     

三相PWM整流器双闭环PI调节器的新型设计

通过分析三相脉宽调制（PWM）整流器在d-q旋转坐标系下的数学模型,设计了具有前馈解耦控制的PWM整流器双闭环控制系统。根据系统对电流内环的控制要求设计电流比例积分（PI）调节器,提出按闭环幅频特性峰值（Mr）最小准则来确定调节器参数的方法;根据系统对电压外环的控制要求,采用模最佳整定法来设计电压PI调节器。最后对整个PWM整流器双闭环控制系统进行仿真,仿真结果验证了PI调节器设计的正确性。     

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。     

三相电压型PWM整流器控制新技术的研究

根据电压型PWM整流器在同步旋转dq坐标系中建立的整流器电流控制数学模型,基于电流前馈解耦,解决了有功电流和无功电流互为耦合问题。为克服直流电压响应较慢、抗扰性较差的不足,提出了采用电流内环、基于滑模控制的电压外环电压型PWM整流器的新控制策略。由于采用滑模控制的电压外环,提高了整流器直流电压跟踪和电流跟踪能力,使系统具有响应快、稳定性好、抗负载扰动能力强的优点。文中给出了系统控制器的设计方法。通过正常负载及负载扰动情况下的计算机仿真,证明了新控制策略的可行性。     

变速恒频风力发电用双PWM变换器的协调控制

文章首先分析了双馈风力发电机的原理以及其数学模型,然后分析了变速恒频风力发电技术采用双PWM变换器常规控制策略,在此基础上提出了采用双PWM变换器的协调控制策略。最后利MATLAB/SIMULINK软件对整个风力发电系统进行仿真。结果表明此策略实现了风力发电机的变速恒频运行,另外在定子电流变化的同时,保持了恒定的功率因数,实现了对双馈感应电机的有功功率和无功功率的独立控制。     

基于三相PWM变换器的蓄电池恒流放电装置研究

介绍了一种基于三相PWM电压源变换器(PWM VSC)的能量回馈式蓄电池恒流放电装置。建立了PWM VSC在同步旋转坐标系下的复数矢量传递函数模型，设计了交流电流复数PI控制器，并基于功率平衡系建立了放电电流的数学模型，提出了系统的控制方案。实验结果表明装置能够实现蓄电池的高精度恒流放电，而且交流侧电流波形好，功率因数高。     

Control of Three-Level PWM Converter Applied to Variable-Speed-Type Turbines

This paper proposes advanced control of a three-phase three-level neutral-point-clamped pulsewidth-modulated (PWM) converter connecting a permanent-magnet synchronous generator to a grid. The control scheme is mainly based on active and reactive power loops and contains the following additional blocks: virtual flux and filter-capacitor voltage estimators for sensorless operation, active damping (AD) of possible resonances in the LCL filter that connects the converter to the grid, and a PWM modulator with dc-link voltage balancing and minimization of switching losses. It is shown that the proposed control method exhibits several features such as sensorless operation, robust algorithm, minimization of switching losses, and simple tuning procedure of AD. The simulation and experimental results have proven an excellent performance and verified the validity of the proposed system.     

Direct frequency convertor with sinusoidal line currents forspeed-variable AC motors

A novel concept for a static three-phase to three-phase power converter for an AC drive with a unity power factor and reduced harmonics on the line side is presented. The power circuit comprises two back-to-back connected six-pulse bridges having no energy storage elements in the DC link. This permits pulse-width modulation (PWM) control in both bridges while requiring active turn-off semiconductor switches in only one bridge. The line-side harmonics are suppressed by a three-phase second-order filter. The method of predictive optimization is used for the control of the power converter. The complex control structure of the system is based on an online prediction of space vector trajectories. The steady-state operation of the system is exemplified by simulation results     

Current-fed three-phase and voltage-fed three-phase activeconverters with optimum PWM pattern scheme and their performanceevaluations

This paper describes a new approach to select the optimum sinewave pulsewidth modulation (PWM) patterns suitable for a large-capacity current-fed active PWM power converter and a practical design procedure to determine circuit constants of a low-pass filter connected to suppress higher line current harmonics flowing into the utility-grid AC power source. A feasible test is implemented by building a prototype 500 kW three-phase current-fed PWM power converter which is designed and controlled on the basis of the proposed considerations. It is verified from a practical point of view that these new conceptual considerations are more effective and acceptable to minimize higher harmonic current components flowing into the utility-grid AC power source. This experimental setup provides highly efficient steady-state characteristics of the current-fed three-phase PWM power converter under the operating condition of a unity power factor correction and sinewave line current shaping schemes. Furthermore, this unique optimum PWM pattern derived from the theoretical method proposed here is conveniently applicable to a voltage-fed three-phase PWM converter. It is verified that this optimum PWM pattern provides excellent switching performance with a lower switching frequency mode than the conventional carrier-based PWM scheme     

单位功率因数PWM整流器矢量控制研究

本文介绍了三相电压型PWM整流器的工作原理及数学模型,并搭建了双闭环矢量控制系统。其中,针对矢量控制中相位角获取的不同方法,分别采用直角坐标-极坐标变换器和锁相环来跟踪电压、电流初始相位,使交流侧输入电压电流同相位,实现零静差矢量控制,完成单位功率因数整流,仿真实验结果验证了该算法的正确性和可行性。     

基于dsPIC30F4012型微处理器的三相电压型PWM整流器研究

建立了电压型PWM整流器模型,提出一种实用的电流解耦方案,给出一种由dsPIC30F4012型微处理器控制的三相电压型PWM整流器控制系统,详细介绍其系统组成、控制原理及硬件结构,论述其软件流程,给出实验结果.     

Novel reduced-order small-signal model of a three-phase PWMrectifier and its application in control design and system analysis

A reduced-order (RO) small-signal model of three-phase pulse-width-modulation (PWM) rectifiers is proposed. By combining the PWM switch model and equivalent multimodule model techniques in DC-DC converters, a three-phase rectifier can be modeled as a DC-DC converter with equivalent power capability and small-signal characteristics. This model reduces the system order to two and greatly simplifies the control design and system analysis of three-phase converters. In this paper, the proposed model is also used for control design and for system interaction analysis on the three-phase interface of a boost rectifier. The RO model is verified with the d-q model, switching-model simulation, and experimental results