共查询到19条相似文献，搜索用时 171 毫秒
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利用MATLAB/SIMULINK仿真软件,构建了双馈感应发电机仿真模型,对容量1．5MW变速恒频双馈感应风力发电机进行了变速恒频仿真,仿真结果表明：所建立的模型是正确的,变速恒频运行特性是良好的。 相似文献
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王洪涛 《三明高等专科学校学报》2013,(6):45-49
基于变速恒频双馈风力发电机组,通过调节发电机转侧子电流的大小调节系统的有功功率和无功功率,实现解耦控制。并在理论推导的过程中建立数学等效模型。最后运用MATLAB／Simulink电力系统建模与仿真平台分析发电机组在无功控制模式下风电系统在稳态和三相短路故障下运行输出特性。 相似文献
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伴随着风力发电技术的推广和应用,为了满足企业对工程技术人才的需求,高校的相关专业需要加强在校学生的工程能力培养与锻炼,使之具备风力发电技术的工程应用和创新能力。面向工程需求,开发出了双馈风力发电实践教学平台,通过采用模块化和开放式的设计,使学生能够对双馈风力发电机的励磁控制、变速恒频发电运行控制、风力机特性模拟,以及相关的系统开发、数据通信、数字滤波等多种工程技术进行实践、开发和创新,为高级工程技术人才的培养提供了有力支撑。 相似文献
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文章对变速恒频双馈风力发电系统的组成及工作原理进行了论述,研究了相关的控制技术,并进行了实验研究,对实验结果作出了具体分析。 相似文献
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针对一种基于功率分汇流系统的新型变速恒频风力发电机,进行了实验测试平台的原理设计、功能开发。在对变速恒频风力发电机相关运行特征和性能分析的基础上,开发该实验台教学功能,相应设计了模拟变速恒频风力发电的实验,使学员可以了解行星轮系的变速调节及功率分汇流原理。 相似文献
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《实验室研究与探索》2017,(10):119-122
针对双馈风力发电机(DFIG)复杂非线性特点,在同步旋转d-q轴坐标系下数学模型基础上,介绍了磁链开环转差控制策略下双馈风力发电机(DFIG)非线性微分模型推导过程;运用Matlab软件对某实际双馈风力发电机的非线性微分动力学模型进行数值仿真。仿真获得的子空间运动轨迹图和时域波形图展现了系统从规则运动转化到混沌运动所具有的特征。该仿真能使学生深刻的认识双馈风力发电机中存在的非线性动力学行为,准确分析双馈风力发电机稳定性,这种理论与仿真相结合的方法能够有效地提高教学质量。 相似文献
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马佳骝 《洛阳工业高等专科学校学报》2012,22(3)
双馈感应发电机特殊的电路结构使其在并网运行时对电网电压跌落非常敏感,通过Crowbar保护电路短接转子是目前常采用的实现双馈感应发电机低电压穿越的措施,其主要缺点是此时双馈机运行于异步机状态,需要从系统吸收无功进行励磁.本文对双馈感应发电机电压跌落下的运行特性进行了分析,在总结了传统的Crowbar投切控制策略优缺点的基础上提出了一种改进的Crowbar投切控制策略.在MATLAB/Simulink仿真平台下搭建并网双馈机风电场模型,对双馈机低电压穿越运行特性和所提的Crowbar投切控制策略进行仿真分析.仿真结果证明了所提的改进的Crowbar投切控制策略的有效性. 相似文献
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This paper proposes an analysis and a direct power control （DPC） design of a wind turbine driven doubly-fed induction generator （DFIG） under unbalanced network voltage conditions. A DFIG model described in the positive and negative synchronous reference frames is presented. Variations of the stator output active and reactive powers are fully deduced in the presence of negative sequence supply voltage and rotor flux. An enhanced DPC scheme is proposed to eliminate stator active power oscillation during network unbalance. The proposed control scheme removes rotor current regulators and the decomposition processing of positive and negative sequence rotor currents. Simulation results using PSCAD/EMTDC are presented on a 2-MW DFIG wind power generation system to validate the feasibility of the proposed control scheme under balanced and unbalanced network conditions. 相似文献
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Adaptive rotor current control for wind-turbine driven DFIG using resonant controllers in a rotor rotating reference frame 总被引：1，自引：0，他引：1
This paper proposes an adaptive rotor current controller for doubly-fed induction generator （DFIG）, which consists of a proportional （P） controller and two harmonic resonant （R） controllers implemented in the rotor rotating reference frame. The two resonant controllers are tuned at slip frequencies ωslip＋ and ωslip-, respectively. As a result, the positive- and negative-sequence components of the rotor current are fully regulated by the PR controller without involving the positive- and negative-sequence decomposition, which in effect improves the fault ride-through （FRT） capability of the DFIG-based wind power generation system during the period of large transient grid voltage unbalance. Correctness of the theoretical analysis and feasibility of the proposed unbalanced control scheme are validated by simulation on a 1.5-MW DFIG wind power generation system. 相似文献
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On maximum power point tracking control strategy for variable speed constant frequency wind power generation 总被引：1，自引：0，他引：1
WU Guo-qing NI Hong-jun WU Guo-xiang ZHOU Jing-ling Zhu Wei-nan MAO Jing-feng CAO Yang 《重庆大学学报(英文版)》2010,9(1):21-28
Based on the characteristic of AC-excited variable speed constant frequency （VSCF） wind power generation, the vector control technique was applied in a doubly fed induction generator （DFIG）. Maximum wind energy or maximum output power point can be tracked by decoupling control of active power and reactive power. The research result shows that the net power of generation system delivered to grid in maximum wind energy tracking mode is not the most. We presented a novel maximum power point tracking （MPPT） control strategy by analyzing the DFIG mathematic model and power relations which delivered the maximum power to the grid. The maximum power point could be tracked automatically without measuring wind speed in the control strategy and the control was independent of optimal turbine power curve, which had excellent dynamic and static performances and robustness. Simulation and experimental results testify the accuracy and validity of the control strategy. 相似文献
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风速的随机性、间歇性及不确定性,必将导致风电场的输出功率也具有随机波动性和间歇性,风电系统的输出功率影响电网的安全稳定运行和电能质量．通过构建了以鼠笼式感应电机为发电系统的定速变桨距风力发电系统,展开功率跟踪控制系统分析．给出了风力机空气动力学特性和建模方法,建立了传动链数学模型和感应发电机的数学模型．设计了转矩控制环、速度控制环,给出了实现功率跟踪的功率控制环设计思路,仿真结果表明,该系统能实现风电系统的最优功率跟踪控制． 相似文献
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许胜辉 《武汉职业技术学院学报》2013,12(1):84-89
针对风力发电并网的优化问题。提出了三相电压源脉冲宽度调制（PWM）逆变器的定向矢量控制技术,并设计了数字控制的变换器一逆变器系统。给出了该变换器和逆变器的数学模型。提出了一种定向矢量控制的方案来实现对风能并网的控制策略。为了检验该系统的动态性能。采用MATLAB7／SIMULINK程序进行了仿真。仿真结果表明,提出的控制系统模型在不同的干扰下都展现出其良好的性能。 相似文献
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Dynamic equivalence of the wind farm is a fundamental problem in the simulation of a power system connected with wind farms because it is unpractical to model every generator in a wind farm in detail. In this paper, an Equivalence Method based on the Output Characteristics （EMOC） is proposed, with which the wind farm composed of Squirrel-Cage Induction Generators （SCIGs） can be equivalent to one generator. By considering the diversity of wind generators and special operating characteristics of a wind farm, the equivalent generator based on EMOC responds accurately in various faults. No matter whether the wind farm is integrated in grid or just programmed, EMOC can be used to acquire an accurate equivalent generator. Simulation of the dynamic equivalence of an SCIG wind farm validated the method. 相似文献
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提出在电磁暂态分析软件PSCAD/EMTDC环境中对电动机两相接地故障进行仿真,以两相接地故障的数学模型代替实际电力系统,用数值方法对系统的运行进行试验和研究。该模型不仅可以对发电机故障的瞬态和稳态过程进行仿真,而且能够揭示发电机故障瞬态的运行特征及瞬态过程中各个故障量的变化规律。验证了EMTDC电动机模型和算法的有效性和正确性,为电动机故障诊断和保护的深入研究提供了有效的仿真平台。 相似文献
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A rotary valve-controlled pitch system is proposed to regulate the generator power and smooth power fluctuations for a wind turbine. Design details and dynamic modeling of this pitch system are presented and analyzed. A practical loading compensation approach is synthesized and involved in the pitch system to compensate for the external uncertain pitch loads. The proposed pitch system and loading compensation approach have been experimentally evaluated in terms of generator power smoothing and control accuracy. As demonstrated by the comparative experimental results, the proposed pitch system can be used to significantly smooth the generator power fluctuations and hence to improve the power quality as compared with a servo valve-controlled pitch system under the same operating conditions. The loading compensation approach can also be used to significantly attenuate the effects of external pitch loads and improve the robustness and reliability of the pitch system. The proposed pitch system features good control accuracy and cost-efficiency and hence is attractive for applications in modern largescale wind turbines. 相似文献