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带有RCC的异步风力发电机系统的特性分析 总被引:2,自引:0,他引:2
介绍了带有转子电流控制器(RCC)的变桨距调节异步风力发电机系统的基本原理及其控制策略。基于Saber仿真软件,建立了变桨距风力机、绕线式异步发电饥、转子电流控制器以及风速等的仿真模型,并以此为基础深入研究了该类风力发电机系统的运行特性。仿真分析表明,引入转子电流控制可以明显改善发电机的输出电能品质,降低变桨距风力机的调节频率,延长变桨距机构的使用寿命。制作了一套7.5kW模拟异步风力发电机的RCC系统,对带有RCC的异步风力发电机系统进行了模拟实验研究。 相似文献
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本文从电网电压对异步发电机效率、输出电流、功率因数等主要性能影响,提出风力异步发电机的型式和风力发电机节能效果密切相联。选用电动机作异步发电机运行是不可取的,不但运行性能差,其经济效益也不理想。风机专用异步发电机可以获得满意的性能和节能效果,设计要点和经济分析表明,这是一种有发展前途的节能风力发电机。风机用高滑差异步发电机,使风机输出功率波动大大减少,极有利于小风柴系统的稳定运行,该电机效率曲线平坦,其节能效果也十分明显。小风柴系统和风力田开发,适宜推广这种电机。 相似文献
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当永磁同步发电机应用在发电系统中,会遇到诸多问题.首先其转子磁场存在不可控制性,其次当发电机端电压过大超过传统变流器直流母线电压时会引起变流失败,再次永磁发电机输出电流流向难以直接控制等问题.为解决上述问题,提出了在永磁同步发电机三相出线端串接感性电抗器,通过控制电抗器上的电压幅值和相位间接控制三相出线端电流的控制策略,从而可以有效的解决上述问题.根据余热发电系统的要求,结合永磁同步电机的矢量控制技术,搭建了永磁同步发电机电磁转矩控制的仿真平台.仿真结果验证了设计方案能够合理与有效的控制永磁同步发电机电磁转矩. 相似文献
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针对变速恒频无刷双馈风力发电系统,分析无刷双馈发电机的最大吸收功率与转速之间的关系,提出采用直接转矩控制方法,通过控制发电机转矩和功率因数来调节其有功功率,进而实现最大风能捕获,提高发电效率。此外,还针对无刷双馈发电机内部磁场关系复杂的特点,提出一种新型的速度观测方法,以两相静止坐标系作为参考坐标系,通过估算转子磁链同步旋转速度和转差速度来估测发电机转速,进而实现无速度传感器控制,以提高系统可靠性。由仿真结果可以看出,通过快速调节发电机转矩可以有效获得最大吸收功率,所设计的速度观测器也能快速准确地估算出发电机转速。 相似文献
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To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms, the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding structure. Consequently, the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding structure. Therefore, a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this paper. Based on the direct power control (DPC) strategy, the post-fault voltage vector selection method is explained in detail according to the fault types of the dual converters. The fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator (BDFRG) system to operate normally in one, two, or three switches fault of the converter, simultaneously achieving power tracking control. The presented results verify the feasibility and validity of the scheme proposed. 相似文献
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为了准确掌握鼠笼型感应风力发电机组的运行状态,在分析其功率特性的基础上,针对风电机组建模过程中容易忽略偏航系统误差的问题提出了一种充分考虑风电机组输入参量的建模方法,并结合现场数据分析发现依据该方法建立的模型是有偏差的;在深入分析后再次提出两种引入机组惯性的模型改进方案。用LSSVM方法建立各个方案模型,测试结果表明,引入机组惯性可以有效地提高机组功率特性模型的精度,模型的相对平均误差(MRE)由6.7%下降到5.6%;多组测试数据的测试结果表现出模型有较好泛化能力,可以准确跟踪机组功率变化,为风电机组功率特性建模提供一个新思路。 相似文献
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In general, the commercialized medium‐sized asynchronous wind turbines are fully automated facilities designed to operate in parallel connection to the grid; in case of isolated operation, they need to be combined with diesel generator. This paper aims at studying the method of producing electricity of maximal quality with the wind, by constructing a new stand‐alone hybrid (medium‐sized asynchronous wind turbines, UPS with battery, and photovoltaic array) power system without diesel generator. This paper proposes a new architecture of stand‐alone hybrid power system that consists of medium‐sized asynchronous wind turbine, UPS, current limiter (reactor), photovoltaic array, and consumer and dump loads; accordingly, a supervisory control and data acquisition (SCADA) for this system is suggested along with the operation strategies depending on the output power of the UPS and wind turbine, consumer load, and the battery voltage of UPS. The case study was confirmed through the simulation results of the operation of a new stand‐alone hybrid (two 110 kW of asynchronous wind turbines, 250 kVA of UPS with battery, reactor, 36 kW of photovoltaic array, and consumer and dump loads) power system. The results of the simulation showed that the system frequency change of the new stand‐alone hybrid power system was 60 ± 0.5 Hz, and the one of the wind + diesel stand‐alone hybrid system was 60 ± 1 Hz, for the sudden change of consumer load and gust. This new system can be eligible as a standardizing option for the architecture of nondiesel stand‐alone hybrid system and its SCADA system. 相似文献
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With the advance of power electronic technology, direct‐driven permanent magnet synchronous generators (PMSG) have increasingly drawn interests to wind turbine manufacturers. Unlike a fixed‐speed wind turbine, the maximum power extraction of a PMSG wind turbine is affected by (1) electrical characteristics of the generator, (2) aerodynamic characteristics of the turbine blades, and (3) maximum power extraction strategies. In an environment integrating all the three characteristics, it is found in this paper that the existing commercial lookup‐table maximum power extraction mechanism suitable to a DFIG wind turbine is not suitable to a PMSG wind turbine. Through the integrative study of all the three characteristics, this paper proposes a novel PMSG maximum power extraction design. The special features of the proposed strategy include (i) an adaptive virtual lookup‐table approach for PMSG maximum power extraction and (ii) an implementation of the peak power‐tracking scheme based on a novel direct‐current vector control configuration. The proposed maximum power extraction mechanism with a nested speed‐ and current‐loop control structure is built by using MatLab SimPowerSystems. Simulation studies demonstrate that the proposed PMSG peak power‐tracking strategy has superior performance in various aspects under both stable and gust wind conditions. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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通过对离网型风力发电机实际运行状态及气象情况的监测,绘制了风速-功率散点图.利用最大似然估计法对风机输出功率曲线进行拟合,结果表明:七次多项式拟合结果最逼近实际工况;二次多项式拟合曲线精度稍差,但表达式简单明了,可快速预测风力发电机发电量.此外,通过对风力发电机发电量的实际值、理论功率曲线预测值以及利用最大似然估计法拟合得到的功率曲线的预测值的对比,结果表明:风力发电机生产厂商提供的曲线只能反映其稳态的风速-功率关系,用来预测风力发电机发电量还存在较大误差;利用最大似然估计法拟合得到的功率曲线预测的风力发电机发电量误差明显偏小. 相似文献
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