共查询到20条相似文献,搜索用时 125 毫秒
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在介绍谐波的检测和分析传统方法的基础上,详细分析了基于频域分析的FFT变换检测方法,并用Matlab软件对三相可控整流的谐波电流进行了仿真实验。仿真结果表明,基于频域分析的FFT变换检测方法下的谐波电流和无功电流检测,能准确及时地检测出三相电路中的谐波电流和无功电流。 相似文献
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在介绍谐波的检测和分析传统方法的基础上,详细分析了基于频域分析的FFT变换检测方法,并用Matlab软件对三相可控整流的谐波电流进行了仿真实验。仿真结果表明。基于频域分析的FFT变换检测方法下的谐波电流和无功电流检测,能准确及时地检测出三相电路中的谐波电流和无功电流。 相似文献
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基于阀电流特征的高压直流换相失败检测方法 总被引:2,自引:0,他引:2
针对电磁暂态仿真中高压直流换相失败无可靠检测方法的难题,分析了高压直流逆变侧换相失败的过程及相关电气量波形特征,提取换相失败时阀电流的特征并提出基于阀电流特征的换相失败判据。设计了基于阀电流特征的换相失败检测方法,其主要包含三部分:阀电流极值点及其前后变化速率检测、阀电流最大值检测及极值点后阀电流持续非零时间检测。以CIGRE BENCHMARCK高压直流模型为例,在PSCAD/EMTDC电磁暂态仿真软件搭建基于阀电流特征的换相失败检测模块,通过仿真验证了理论分析的正确性和所提换相失败检测方法的有效性和准确性。 相似文献
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以电功率微分为输入信号的电力系统稳定器 总被引:1,自引:0,他引:1
提出以电功率微分为输入信号的电力系统稳定器,简化了稳定器结构。在理论分析的基础上,以微机式励磁调节器为背景进行了动模试验研究,证实了其可行性,从而为电力系统稳定器增添了一个结构简单、性能优良的新品种。 相似文献
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利用移相器控制东北电网并行线路潮流的研究 总被引:2,自引:0,他引:2
本文概述了移相器在国外电力系统中的应用,简要介绍了移相器的模拟方法和控制潮流的工作原理,着重进行了利用移相器控制东北电风潮流的可行性研究。 相似文献
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Load modeling for wide area power system 总被引:1,自引:0,他引:1
Ping Ju Chuan QinFeng Wu Huiling XieYan Ning 《International Journal of Electrical Power & Energy Systems》2011,33(4):909-917
The electrical loads have significant impacts on the dynamic performances of the wide area power system, and the dynamic behaviors of the power system can not be reproduced by the simulation system, unless the electrical load was modeled accurately. In the previous load modeling, the dynamics of the electrical load itself is of concern. Using such load models, the satisfied dynamic behaviors of the wide area power system can not be obtained by simulation. In this paper, a system-wide load modeling strategy is proposed. The electrical loads are firstly classified into a few categories using the component based load modeling method. According to the problems studied, the output variables of the power system are selected, and the objective function is constructed using the data from Wide Area Measurement System (WAMS). The trajectory sensitivities of the load model parameters with respect to the output variables are analyzed. Based on which, the key parameters playing important roles on dynamics of the power system are identified and included in further parameter estimation. The load models for the wide area power system are built simultaneously, and the system-wide load modeling method is implemented on the IEEE 39-bus system to evaluate its effectiveness. 相似文献
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一种新型的串联型有源电力滤波器 总被引:8,自引:4,他引:8
提出了一种基于等效电阻概念和功率平衡原理的串联型有源电力滤波器(APF),新串联型有源电力滤波器不需要进行复杂的谐波检测计算,通过简单的控制就可以获得电源电流的参考信号,实现对谐波和无功电流的同时补偿。研制了实验样机,实验结果与理论分析和仿真结果相吻合,验证了所提出控制方法的正确性,并显示所提出的串联型APF对电压型谐波源有良好的补偿特性。 相似文献
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贾建科 《国外电子测量技术》2012,31(8):58-60
随着通信设备的小型化和工作频率的不断提高,微带功率分配器在通信设备中被广泛应用正.基于此,在分析功率分配器设计理论的基础上,设计了一微带Wilkinson功率分配器.利用MWO仿真软件进行了具体微带电路建模,并进行了优化设计,对该功率分配器的S参数进行了仿真分析,仿真结果表明达到了设计要求.最后给出功率分配器三维布线图. 相似文献
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Iranian power system encountered major oscillations in January 2008 in the northeastern area with an amplitude of about 120 MW. Since not all the events and variables had been recorded, a scenario to simulate the recorded oscillations and results of studies conducted to reproduce the oscillations by simulation are discussed in the first part. Tuning of supplementary controllers, such as PSSs, on the generating units and the use of reactive power compensators in the long transmission line to enhance stability and eliminate severe oscillations between the north and eastern areas are investigated in the second part. Eigen-value analysis and participation factors are used to appreciate the nature of oscillations and the required PSS settings. The results show that, by using the properly tuned PSSs and accurate compensation of the reactive power, transient stability and damping of oscillations are considerably improved. 相似文献