共查询到19条相似文献,搜索用时 218 毫秒
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基于PMU的电力系统建模及参数辨识 总被引:1,自引:1,他引:1
广域测量系统可完整的记录电网的动态过程信息,从而为电力系统的模型建立和参数辨识提供了有效的路径。利用相量测量装置(PMU)记录电网的实时动态信息,可实现对输电线路参数的辨识,包括对称分量和不对称分量;实现对发电机模型参数、励磁系统及调速器模型和参数的辨识;实现对负荷的建模和负荷模型的参数辨识。本文简明扼要的介绍了基于PMU实现上述功能的基本原理和方法,指出可利用当前国内大量广域测量系统建成的有利条件,积极开展线路的参数辨识、发电机、励磁系统、调速器和负荷的建模及参数辨识工作,从而提高电网仿真计算的精确性,为电网调度运行和分析人员提供有益的指导。 相似文献
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针对发电机及其励磁系统的数学模型及参数对电网动态稳定分析结果的影响,选取2007年安徽电网夏季高峰方式数据文件,采用中国电科院版动态稳定仿真程序,对影响电网动稳定较大的几个因素分四种方案作了详细计算分析,指出采用不同的发电机励磁系统模型及参数,动态稳定分析结论差别较大,其中实测模型参数最多的方案计算结果与实际运行工况基本接近,且随着电网规模的扩大,电网内发电机使用经典模型及经典参数会使动态稳定分析结果失真。 相似文献
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针对发电机及其励磁系统的数学模型及参数对电网动态稳定分析结果的影响,选取2007年安徽电网夏季高峰方式数据文件,采用中国电科院版动态稳定仿真程序,对影响电网动稳定较大的几个因素分四种方案作了详细计算分析,指出采用不同的发电机励磁系统模型及参数,动态稳定分析结论差别较大,其中实测模型参数最多的方案计算结果与实际运行工况基本接近,且随着电网规模的扩大,电网内发电机使用经典模型及经典参数会使动态稳定分析结果失真. 相似文献
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基于非线性直接优化方法的发电机励磁系统参数辨识 总被引:1,自引:2,他引:1
励磁模型的准确程度对于电力系统仿真的准确性有显著影响。提出了一种新的、工程中容易实现的方法,即利用非线性直接优化法辨识微分方程形式的励磁模型参数。首先利用Matlab仿真与传统的最小二乘法比较验证算法有效性。然后利用动态信号记录装置,根据模型结构获得各个环节的时域内发电机阶跃试验数据,对1台300 MW汽轮发电机组的励磁系统分别进行分环节参数辨识和整体辨识。利用电力系统分析综合程序(power system analysis software package,PSASP)的用户自定义模型功能建立励磁模型进行相同的阶跃仿真,结果验证了辨识参数在电力系统仿真中的有效性。 相似文献
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基于晶闸管控制电抗器的FACTS动态相量模型 总被引:1,自引:2,他引:1
利用电力系统变量的时变傅里叶系数得到晶闸管控制电抗器(thyristor controlled reactor,TCR)的动态相量模型,该模型忽略了对TCR动态特性影响较小的谐波分量,并通过对TCR时域模型的平均运算获得动态相量状态空间模型。应用该模型对含柔性交流输电装置的电力系统进行仿真,能在保证一定精度的同时获得较快的速度。基于TCR的动态相量模型提出了静止无功补偿器和晶闸管控制串联电容器的动态相量模型。通过与商业软件DCG/EMTP在简单测试系统上的全时域仿真结果相比较,证明了该动态相量模型的有效性和正确性。 相似文献
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Modeling of synchronous static compensator (STATCOM) of a power system based on the dynamic phasor model to investigate the performance of STATCOM for power quality analysis is described. It is compared with electromagnetic transient program (EMTP) like simulation. The dynamic phasor model and electromagnetic transient (EMT) model of the STATCOM including the power system are implemented in Matlab/Simulink toolbox and PSCAD/EMTDC, respectively. STATCOM dynamic phasor model including switching functions and their control system are presented. A satisfactory solution for power quality problems on typical distribution network is analyzed using the dynamic phasor model and EMTP like PSCAD/EMTDC simulation techniques. The simulation results revealed that the dynamic phasor model of STATCOM is in excellent agreement with the detailed time-domain EMT model of PSCAD/EMTDC simulation. The dynamic behavior of STATCOM using phasor model can be applied for analyzing power quality issues. It is found faster in speed and higher accuracy can be obtained and correlates well with PSCAD/EMTDC simulation results. 相似文献
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Masayuki Watanabe Takuhei Hashiguchi Takanori Izumi Yasunori Mitani 《Electrical Engineering in Japan》2008,163(1):16-24
This paper presents a method of tuning power system stabilizers (PSS) in order to damp low‐frequency oscillations in a multimachine power system based on wide area phasor measurements. The authors have developed a method for detecting interarea low‐frequency modes from measured small oscillations associated with load fluctuations by approximating the oscillations as a coupled vibration model. In this paper, the coupled vibration model is extended to include the effect of PSS. PSS are tuned directly by using the extended model, since the model includes parameters of PSS. The advantage of this method is that steady state phasor fluctuations are available for tuning PSS and assessing the effect of the tuning control. That is, a large disturbance like a line fault is not necessary since the stability of major modes can be investigated directly by using eigenvalues of the extended model. The identification process does not require information on the input to the system for perturbation. Some numerical analyses demonstrate the effectiveness of the method by using phasor dynamical data obtained by a power system simulation package. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 163(1): 16–24, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20640 相似文献
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This paper utilizes data measured by phasor measurement units (PMUs) to extract a low-order dynamic equivalent model for power system stability studies. The estimated model is a 2-order model for synchronous machines. This model has the advantage of simplicity of classical model and considerably reduces the oversimplifying error of classical model. This method offers an alternative approach to analytical model reduction techniques based on the detailed system models. The proposed method uses the synchronized bus voltage and current phasors measured by PMUs. Using post disturbance data, electrical and mechanical parameters of the equivalent generator are estimated sequentially. Furthermore, a new approach for estimation of two-machine and single machine infinite bus (SMIB) equivalent systems are presented for analysis of electromechanical oscillations. To evaluate the performance of the proposed approach, simulations are performed on a two area 13-bus test system and real measured PMU data. Simulation results show that the estimated model can represent the dynamic behavior of the studied system with good approximation. 相似文献