三相电压型PWM整流器建模与仿真

建立了三相电压型PWM整流器的数学模型,并对其矢量控制策略进行了分析,采用输入电压空间矢量定向,根据参考指令电压矢量直接计算空间电压矢量位置和作用时间,结合直接电流控制的方法进行电流跟踪控制,仿真结果证明了该方案的有效性.     

三相电压型PWM整流器控制策略的研究

为了减小用电设备对电网的谐波污染和提高自身的功率因数,PWM整流器的应用越来越广泛。文中根据PWM整流器在两相同步旋转坐标系下的数学模型,运用矢量控制的思想,实现了有功和无功的解耦控制。试验结果表明,控制方法具有响应速度快,稳态性能好,整流器接近单位功率因数运行,可显著抑制谐波对电网的干扰,改善电网运行品质,节约能源。     

三相电压型PWM整流器的数字化控制

介绍了一种采用TMS320F240DSP芯片的控制方案，该方案基于矢量控制的思想实现了三相电压型PWM整流器的控制，实验证明了该控制方案的可行性。     

单周期控制三相电压型PWM整流器

文章对基于单周期控制的三相PWM高功率因数整流器进行了研究,推导了单周期控制三相电压型PWM整流器的控制规律。它不需要乘法器更不需要对输入电压进行检测,其控制逻辑简单并且以恒定频率工作,可以在每个开关周期控制输入电流跟踪正弦参考量,从而实现低电流谐波畸变和高功率因数。基于Multisim2001软件平台,建立了基于单周期控制的三相电压型PWM整流器的仿真模型,完成了6kW三相PWM整流器的设计和实验研究,仿真和试验结果都验证了理论分析的正确性。     

三相电压型PWM整流器空间矢量控制研究及仿真分析

以电压空间矢量控制的基本原理和概念为基础,结合Matlab／Simulink软件包构建了三相PWM整流器空间矢量控制系统的仿真模型,并详细给出各模型的具体参数。仿真结果显示,该方法简单,控制精度高,用于三相PWM整流器中具有良好的动、静态性能。     

三相PWM整流器直接功率控制的仿真研究

基于三相电压型PWM整流器的原理与结构组成,采用电压定向的不定频直接功率控制(VO-DPC),通过对其控制结构的分析,建立其MATLAB/SIMULINK仿真模型.根据仿真结果可以看出,直接功率控制的控制算法简单,而且可以提高整流器的功率因数,有效降低谐波含量.     

基于电压空间矢量的三相PWM整流器控制研究

首先建立了三相电压型PWM整流器的数学模型，并对其矢量控制策略进行了分析，在此基础上提出了一种简单的电压空间矢量算法，该算法根据参考电压矢量在坐标系上的分量直接计算电压空间矢量在各个扇区内的作用时间，实验结果验证了所提出控制算法的可行性。     

不平衡电网条件下三相VSR的建模与仿真

文章对不平衡电网条件下三相VSR进行分析与建模,得出采用开关函数描述的数学模型。为了利于控制系统设计,对三相静止坐标系下的数学模型进行坐标变换,得出两相同步旋转坐标系下的数学模型。针对不平衡电网条件下的三相VSR的功率分析与电流控制指令算法的设计,提出基于正负序同步旋转坐标系三维复空间瞬时功率。通过MATLAB2007a的Simulink仿真平台显示,陷波器能有效滤除不平衡电网电压中的负序分量,交流侧电流基本对称,并实现单位功率因数。仿真结果验证了所建模型的正确性。     

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。     

A New Control Method for Input–Output Harmonic Elimination of the PWM Boost-Type Rectifier Under Extreme Unbalanced Operating Conditions

Under severe fault conditions in the distribution system, not only input voltages but also input impedances must be considered as unbalanced. This paper presents a new control method for input–output harmonic elimination of the pulsewidth-modulation (PWM) boost-type rectifier under conditions of both unbalanced input voltages and unbalanced input impedances. The range of imbalance in both input voltages and input impedances, for which the proposed method is valid, is analyzed in detail. An analytical approach for complete harmonic elimination shows that PWM boost-type rectifier can operate at unity power factor under extremely unbalanced operating conditions resulting in a smooth (constant) power flow from ac to dc side. Based on the analyses in open-loop configuration, a feedforward control method is proposed. Elimination of harmonics at ac and dc side of the converter affects the cost of dc link capacitor and ac side filter. The proposed method is very useful when the PWM boost-type rectifier is subject to extreme imbalance due to severe fault conditions in the power system. In addition, by using the proposed method, the PWM boost-type rectifier can be operated from the single-phase supply in cases where three-phase source is not available. Simulation results show excellent response and stable operation of the PWM boost-type rectifier under the proposed control algorithm. Experimental and simulation results are in excellent agreement.      

Control of Three-Phase, Four-Wire PWM Rectifier

This paper presents the analysis, design, and control of a four-wire rectifier system using split-capacitor topology. The proposed controller does not require any complex transformation or input voltage sensing. A detailed analysis of the distortions in the line and the neutral currents is presented. It is shown that the single-carrier-based, conventional sine-triangle PWM (CSPWM) scheme results in a peak-to-peak neutral current ripple, which is greater than the peak-to-peak ripple of any of the line currents. Also, for the same operating condition, the distortions in the line and the neutral currents increase considerably, when a three-limb boost inductor is used instead of three single-phase inductors. A three-carrier-based SPWM scheme is proposed in this paper. Compared to CSPWM, the proposed scheme significantly reduces the neutral current ripple when three single-phase inductors are used, and reduces both line and neutral current ripples when a three-limb inductor is used. The control scheme is verified through Matlab simulation. It is implemented on an field-programmable gate-array (FPGA)-based digital controller and tested on a prototype. Simulation and experimental results are presented.     

单周期控制三相PWM整流器电压环小信号模型

介绍了一种基于单周期控制技术三相PWM整流器，它可以实现单位功率因数和低电流畸变。该整流器不需要乘法器，控制方法简单、可靠。为方便电压环的设计，文中根据特勒根定理推导出了电压环的小信号模型，由此小信号模型设计了电压调节器，最后对实际电路进行了仿真，仿真结果证明了设计的准确性。     

单相电压型PWM整流电路原理分析与仿真

详细分析单相电压型PWM整流电路的工作原理和工作模式,说明通过对PWM电路进行控制,选择合适的工作模式和工作时序,可使PWM整流电路的输出直流电压得到有效的稳定.同时也调节了交流侧电流的大小和相位,实现能量在交流侧和直流侧的双向流动,并使变流装置获得良好的功率因数.最后建立其Matlab的仿真模型,验证了设计的正确性.     

开关电源Boost变换器输出纹波的仿真研究

文章在分析典型DC-DC变换拓扑结构的基础上,建立了降压型（Boost）DC-DC变换器的PSpice仿真模型。在三种工作模式下,针对输入电压、电感和负载电阻对输出电压纹波都有不同程度的影响,对Boost变换器输出纹波电压的影响因素进行了分析。其结论为Boost型DC-DC变换器的设计和研制提供了理论依据。     

Direct Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions

This paper analyzes the effects of unbalanced voltage on doubly fed induction generators. It also presents a novel control strategy based on direct power control (DPC+) applied to this type of generators, predominant in wind energy applications, that enables them to work under perturbed conditions and achieve optimum results. Although the technique can be implemented to control both rotor converters and grid converters, we will hereby exemplify the former which regulates stator active and reactive power. The results obtained with DPC+ are then compared through experimental tests to indicate that the technique is suitable and achieves good dynamic responses while controlling current distortion, power or torque oscillations. The validation of results has been performed through experimental tests on a 20-kW generator.      

Implementation of a Three-Phase Capacitor-Clamped Active Power Filter Under Unbalanced Condition

A capacitor-clamped voltage-source inverter for active power filter operation under balanced and unbalanced conditions is proposed to suppress current harmonics and compensate the reactive power generated from the nonlinear loads. The adopted voltage-source inverter is based on a three-level capacitor-clamped topology to reduce the voltage stress of power semiconductors. Two control loops are used in the control scheme to achieve harmonic and reactive currents compensation and to regulate the inverter dc side voltage. In the adopted inverter, the neutral point voltage is compensated by a voltage compensator to obtain the balanced capacitor voltages on the dc side. In order to control the flying capacitor voltages, two redundant states in each inverter leg can be selected to compensate the flying capacitor to obtain a better voltage waveform with low harmonic contents on the ac terminals. The balanced and sinusoidal line currents are drawn from the ac source under the balanced and unbalanced conditions. The feasibility of the proposed scheme is confirmed through experimental results     

WDY-1型三相自动调压稳压电源常见故障分析

对为调频广播和电视发送设备供电的三相交流稳压电源在日常工作中的常见故障现象进行了分析,详细地论述了产生此故障现象的原因,以及具体解决的办法。对三相自动调压稳压器的维护保养也做了进一步的概述。     

六开关三相Boost型整流器的电压滑模控制

三相PWM整流器功率因数校正实现的关键在于如何得到与输入电压同相位的输入电流,同时要保证当负载变化时,输出电压能够迅速地跟踪参考值并且稳定下来。首先根据六开关三相boost型整流器的物理模型,分别建立了以电感电流和电容电压为状态向量的数学方程,然后把静止三相坐标转换到旋转d-q坐标下进行电流内环的滞环控制,电压外环的滑模控制。通过仿真,表明该控制方法具有较强的鲁棒性和良好的动态特性,输入电流谐波较小。     

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。