矩阵变换器在变速恒频风力发电中的研究与应用

矩阵变换器直接将电能从输入侧变换到输出侧,能够四象限运行,输入功率因数可为单位1,没有直流电容,输入电流输出电压为只含有高次谐波的正弦波,硬件实现比较简单。文章将矩阵式变换器应用于双馈电机的交流励磁器,建立了以矩阵式变换器为交流励磁器的变速恒频风力发电系统。采用直接功率控制和矢量控制结合的DPVC控制法,该方法使得变速恒频系统能够在不同风速下最大程度地获得风能,高质量发电,并实现有功、无功功率的独立调节。仿真结果验证了该方案的正确性和有效性。     

变速恒频双馈风力发电转子侧控制技术的研究

针对转子侧功率变化频繁和直流母线电压波动剧烈的问题,首先设计了交流励磁变速恒频双馈风力发电系统的框架结构,进而对背靠背PWM变流器的控制策略进行了研究。建立了转子侧变流器控制模型,设计了基于定子电压定向（SVO）矢量控制的变速恒频双馈风力发电系统方案,利用Matlab/Simulink构建系统模型并进行了仿真,仿真结果表明控制策略和技术的可行性,系统实现了有功功率、无功功率的解耦控制和最大风能跟踪控制。最后,构建了一台11 kW实验机组,并进行了系统稳态实验研究,验证了方案的可行性。     

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。     

变速恒频双馈风力发电系统仿真研究

阐述变速恒频双馈风力发电系统工作原理,在分析双馈异步发电机的动态数学模型的基础上,介绍了一种基于定子磁链定向的矢量控制方法,实现对电机的有功功率和无功功率的解耦控制,进而实现最大风能追踪。在DFIG转子励磁电源的研究中,重点讨论基于电网电压定向矢量控制技术的网侧变换器的控制方法,以实现网侧变换器交流侧单位功率因数控制和直流环节电压控制。Matlab仿真结果证明了控制策略的正确性和有效性。     

变速恒频风力发电系统中矩阵变换器的仿真研究

双级矩阵变换器是在传统9开关矩阵变换器的基础上发展起来的一种新型矩阵式变换器,其自身的优点更适宜作为变速恒频风力发电系统中双馈电机的励磁装置.分析了双级矩阵变换器的拓朴结构和基本原理,根据其特点采用PWM控制与空间矢量调制法相结合并应用零电流换流法进行控制,并基于Matlab/Simulink对双级矩阵变换器进行了建模与仿真.仿真结果验证了控制方案的可行性和正确性.     

风电系统中发电机励磁控制系统的研究

论文介绍了风电系统中双馈风力发电机（DFIG）的工作原理,论文中所提出的双馈风力发电系统主要采用了双PWM换流器结构的交流励磁系统。并运用矢量控制的控制策略对网侧变换器和励磁侧变换器进行控制。并通过Matlab软件构建了最大风能追踪的仿真模型对其进行仿真,仿真表明论文中所提出的控制策略能够实现现风力发电系统的最大风能追...     

矩阵式变换器在变速恒频风电系统中的应用

本文首先对9开关矩阵变换器的工作原理以及控制方法进行分析,然后建立了矩阵变换器在d-q坐标系下的数学模型和矩阵式变换器实现变速恒频风力发电功率转换控制结构,并对矩阵式变换器实现变速恒频风电功率转换控制结构进行仿真,结果表明矩阵式变换器应用于变速恒频风力发电系统实现功率转换是可行的。     

变频技术在变速恒频异步风力发电系统中的应用

变速恒频异步风力发电技术,特别是双馈异步发电技术在风力发电中得到了广泛的应用。本文在阐述变频技术在风力发电系统应用的基础上,对变速恒频异步风力发电系统的不同的拓扑结构和控制策略进行了分析,并介绍了变速恒频双馈异步风力发电技术的研究热点以及北京清能华福风电技术有限公司的产品OHVERT-DFIG-1500B型变流器。     

变频技术在变速恒频异步风力发电系统中的应用

变速恒频异步风力发电技术特别是双馈异步发电技术在风力发电中得到了广泛的应用。本文在阐述变频技术在风力发电系统应用的基础上，对变速恒频肄步风力发电系统的不同的拓扑结构和控制策略进行了分忻．许给出了变速恒频双馈异步风力发电技术的研究热点。     

兆瓦级直驱式永磁同步风力发电控制系统研究

永磁直驱风力发电系统与双馈交流励磁风力发电系统相比较,具有结构简单、发电效率及运行可靠性高等优点。采用＂不控整流＋升压斩波＋PWM逆变＂的变流技术,推导了发电机转速变化和DC/DC环节上功率开关器件占空比变化之间的关系,研究了利用占空比调节来进行最大功率点跟踪的新方法。该系统可实现最大风能跟踪控制以及变速恒频发电运行,并对系统进行了仿真和实验,实验结果证明了系统的可行性和正确性。     

A new state feedback based transient control of PWM AC to DCvoltage type converters

This paper presents a new state feedback based control strategy for a PWM AC to DC voltage type converter with phase and amplitude control. In this control strategy the state variables of the LC filter connected to the AC side of the converter are fed back to the PWM pattern generator, thereby eliminating a DC offset of the AC input currents as well as oscillations of the DC output current during transients. Computer simulation of the converter system with the proposed control strategy shows that the transient waveforms of AC input and DC output currents are improved greatly even if the damping effect of the AC side resistance can not be expected. The DC voltage regulation with good dynamic response is also achieved even if DC capacitance is substantially reduced. Experimental results from a low power laboratory model are also included to confirm the simulated results and to demonstrate the effectiveness of the proposed control strategy     

PWM AC／DC功率双向变流器建模方法的研究（一）

基于脉宽调制（PWM）的AC/DC功率双向变流器作为主要功率变换电路，在许多实际应用的电力电子系统中得到广泛应用，如统一电能质量调节器中的有源电力滤波器系统，交-直-交变频调速系统中的整流或逆变部分，电源系统的逆变器，再生能源并网发电系统中的逆变器以及灵活交流输电系统中的统一潮流控制器等等。在各种应用系统中，人们建立其数学模型进行系统分析和控制设计以满足系统目标。PWM整流器数学模型的研究是PWM整流器及其控制技术研究的基础，本文研究介绍了目前较为流行的四种建模方法，并分别分析其特点及应用。     

DC voltage control and stability analysis of PWM-voltage-typereversible rectifiers

A PWM voltage rectifier has useful characteristics on its DC and AC sides. On its DC side, a DC-link unidirectional voltage is obtained and bidirectional power transfer capability is possible by reversing the flow direction of the DC-link current. On its AC side, near sinusoidal current waveforms and AC four-quadrant operation can be obtained, leading to high-quality power being exchanged between the power converter and the mains. The use of AC filters becomes unnecessary. The rectifier DC voltage must be regulated to a constant value. In this paper, three solutions for the DC voltage control are presented. In the first solution, the DC voltage is controlled by acting upon the quadrature component of the power converter fundamental Park's voltages with relation to the mains voltages. Slow responses are necessary because of stability reasons. Also, load power variations produce both active and reactive power variations in the power converter AC side. To improve the DC voltage response, a second control solution is presented. The power converter currents in Park's coordinates must be controlled. The DC voltage is controlled by controlling the direct Park's current component and, thus, acting only on the active power of the converter AC side. Faster responses are achieved. In this case, load power variations do not produce reactive power variations in the converter AC side. The third control solution is a simplified version of this last one. Experimental results from a 2 kVA IGBT-based prototype showing good system dynamic performance are presented     

三相电压型PWM变流器的线性化状态反馈解耦控制

三相电压型PWM变流器在实现能量变换的同时可以消除谐波、实现单位功率因数运行,是一个多输入多输出的非线性系统。文章建立了基于开关函数的变流器数学模型,采用非线性变换以及引入变流器交直流侧的动态功率平衡两种方案相结合,得到了线性化的变流器数学模型。在线性化数学模型的基础上,提出了电压型PWM变流器的线性化状态反馈解耦控制。仿真结果表明该控制策略能较好地实现三相电压型PWM变流器有功功率和无功功率的解耦控制,具有较好的动态特性,而且网侧电流谐波含量很低。     

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     

采用电流矢量控制的电流型PWMAC/DC变换器非线性控制策略的研究

文章提出了一种采用电流矢量PWM控制的非线性控制策略，该方案通过电流矢量PWM控制来跟踪电流指令，从而简化了电流型PWM AC／DC变换器波形发生。在建立电流型PWM AC／DC变换器d-q模型基础上，采用输入输出线性化方法实现了解耦控制，给出了理论分析和调节器参数整定算法，并利用Mallab对控制策略进行了仿真，获得了预期效果。     

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