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兆瓦级直驱式永磁同步风力发电控制系统研究 总被引:2,自引:0,他引:2
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。 相似文献
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风能作为一种取之不尽、用之不竭的可再生清洁能源,因其分布地域广、储量巨大而具有广阔的应用前景,因此风力发电始终保持着良好的发展态势。本文采用Arduino芯片作为核心控制器,设计了一种风力发电的小型模拟装置:采用小型直流发电机固定叶片的方式,并与导流板相结合,在有风的情况下通过风力吹动发电机扇叶带动直流发电机转动实时发电,并点亮LED灯;利用角度传感器检测实时风向,使用最小二乘算法拟合风速与电压之间的函数关系,提升了功率检测精度;最后通过LCD1602液晶显示器实时显示风速、风向和发电功率。实验结果表明,该风力发电的小型模拟装置能够准确实现发电模拟功能,系统整体上运行稳定可靠。 相似文献
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本文以永磁直驱风力发电矢量控制系统为研究对象。在详细推导永磁发电机数学模型基础上,采用电流矢量解耦独立控制永磁发电机输出电流的有功和无功分量,实现无静差控制。同时通过最佳叶尖速比法最大风能跟踪方法,获得最大风能利用系数,实现系统的最大效率运行。仿真结果表明所采用控制策略的有效性。 相似文献
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直驱型风力发电系统是一种交-直-交变速风力发电系统,需要用到大功率整流器。这种交-直-交变速风力发电系统的最显著的特点在于,风力发电机与电网之间连接了功率缓冲电路,从而通过变速控制使风力发电机始终运行在最佳功率负载线上。 相似文献
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在传统能源供应紧张的今天,新能源越来越受到人们的关注,很多的控制算法及电路构成相继被提出。针对小型风力发电中的功率跟踪控制方法,采用了公式推导的方法,得出了通过改变占空比实现功率跟踪的结论。并结合功率跟踪,设计了一种适用于小型风力发电系统的电能管理电路,适应风力发电机不分昼夜特性,分析了其工作原理,并给出相关的软件流程。 相似文献
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本文介绍了小型风力发电系统的基本组成,采用C8051F410单片机作为控制核心,对系统的主电路和外围电路进行了设计;通过软件控制,得到了不同风速和负载条件下的最大功率跟踪控制、负载跟踪控制及蓄电池充放电控制的实验结果,实验结果良好,基本验证了系统软硬件设计的合理性及小型风力发电系统集成控制的可行性。 相似文献
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针对小型永磁同步风力发电系统,综合考虑风速、负载变化和蓄电池充放电特性的负载跟踪,充电控制策略及其最大风能捕获集成控制策略,通过调节升降压(Buck-Boost)变换器的占空比及使用卸荷负载相结合,来实现风力机最佳运行,就可以实现系统集成控制。 相似文献
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The wind energy generation,utilization and its grid penetration in electrical grid are increasing world-wide.The wind generated power is always fluctuating due to its time varying nature and causing stability problem.This weak interconnection of wind generating source in the electrical network affects the power quality and reliability.The localized energy storages shall compensate the fluctuating power and support to strengthen the wind generator in the power system,in this paper,it is proposed to control the voltage source inverter(VSI)in current control mode with energy storage,that is,batteries across the dc bus.The generated wind power can be extracted under varying wind speed and stored in the batteries.This energy storage maintains the stiff voltage across the dc bus of the voltage source inverter.The proposed scheme enhances the stability and reliability of the power system and maintains unity power factor,it can also be operated in stand-alone mode in the power system.The power exchange across the wind generation and the load under dynamic situation is feasible while maintaining the power quality norms at the common point of coupling.It strengthens the weak grid in the power system.This control strategy is evaluated on the test system under dynamic condition by using simulation.The results are verified by comparing the performance of controllers. 相似文献
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充分利用风能是风力发电控制的主要目的之一,为达此目的,本文基于风力机特性和双馈风力发电机的数学模型,提出了一种不依赖于风速测量来实现双馈风力发电系统最大功率点追踪(MPPT)控制的策略。该策略应用定子磁链定向矢量控制技术,对双馈发电机进行有功功率和无功功率的解耦控制,然后通过对发电机输出有功功率进行控制来间接得到与风速相对应的最佳叶尖速比和最优转速,从而实现最大功率点追踪(MPPT)控制。仿真结果证实了基于该方法,双馈风力发电系统在风速变化过程中能自动寻找并追随最大功率点,且控制相对简单,运行可靠,有较高的实用价值。 相似文献
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介绍了开关磁阻发电机工作模式并选用了他励发电模式。在此基础上搭建了以跟踪最大风能为目的开关磁阻风力发电系统模型。针对开关磁阻电机的特点,选择了转速反馈控制方案来实现系统的风能跟踪。在阵风、渐变风、随机风三种典型风速变化下对所搭建系统进行了仿真研究,证明该系统能够完成最大风能跟踪。 相似文献
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Cardenas R. Pena R. Clare J. Asher G. Proboste J. 《Power Electronics, IEEE Transactions on》2008,23(3):1075-1084
This paper addresses the analysis and performance of several model reference adaptive system (MRAS) observers for sensorless vector control of doubly-fed induction machines. Small signal models allow the formal analysis of the observers for a given dynamic. The performance of each MRAS observer is analyzed, considering grid-connected and stand-alone operation. The MRAS observers are implemented in a 3.5 kW experimental prototype composed of a doubly-fed induction generator and a wind turbine emulator. Experimental results validate the predictions of the small signal models and demonstrate the performance of the sensorless methods during both steady state and variable speed wind energy generation. 相似文献
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DFIG-Based Power Generation System With UPS Function for Variable-Speed Applications 总被引:1,自引:0,他引:1
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《Industrial Electronics, IEEE Transactions on》2008,55(1):218-228
This paper describes a vector control scheme for a stand-alone generator based on a wound rotor induction machine with rotor side control. The stand-alone generator refers to an isolated grid feeding a local load. The primary objective of the control scheme is to maintain constant voltage and frequency at the output of the generator irrespective of prime mover speed variation. A novel, simple, and easily implementable sensorless control scheme is proposed. The issue of power quality, which is one of the main concerns of a stand-alone generation system, is also addressed. This is done by incorporating the active filter concept in the control scheme to cancel significant harmonics. A method of unit vector generation for field-oriented control is proposed. A laboratory prototype consisting of back-to-back insulated-gate bipolar transistor converters and a TMS320F240 DSP controller is developed. Detailed experimental results are presented which demonstrate and validate the effectiveness of the proposed scheme. 相似文献
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