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1.
文章提出了一种基于相似度同调的双馈风电场聚合方法。首先利用Prony算法提取各风电场中双馈风机故障下功率响应曲线的动态特征,基于相似理论确定双馈风机间振荡模式中相似部分,应用相似振荡模式中的频率、阻尼、幅值等信息定义了双馈风机同调判别的相似度量化指标并确定同调机群。然后,根据双馈风机的外特性,提出功率聚合算法,即以双馈风机输出有功功率为权重求取等值机的暂态内电势并确定等值母线及等值机参数。该方法从同调机群识别、同调母线聚合、同调机群参数聚合等方面,系统地解决了不同双馈风电场的同调聚合问题。参数聚合方法不仅解决了聚类分群的复杂性和局限性,而且有效保留原系统中电气与结构特征。最后以实际云南电网中某地区风电场为例进行仿真验证。 相似文献
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励磁系统的控制模式和控制参数对发电机及电力系统安全稳定运行有较大影响,一些厂矿企业电网的停电事故,暴露出自备电厂运行时存在励磁系统稳定问题。针对此问题,建立了计及恒无功、恒功率因数励磁控制方式的Heffron-Philips扩展模型,形成系统状态矩阵,通过特征根分析研究影响励磁系统稳定性的主要因素;基于根轨迹方法提出一种考虑系统稳定性的励磁系统控制参数优化方法。剖析了某实际厂矿企业自备电厂发电机组异常振荡现象的机理,并改进了励磁控制参数,仿真结果验证了所提方法的有效性。 相似文献
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电力系统动态等值参数聚合的实用方法 总被引:10,自引:2,他引:10
在大规模电力系统暂态稳定分析中,为减少数值仿真的计算量,可采取动态等值的方法对系统进行简化。电力系统动态等值包括相关机群动态识别、网络化简和相关机群参数聚合3部分。针对第三部分提出了一种基于加权法的相关机群详细模型参数聚合的方法,该方法可用于获得等值发电机组及其调节系统的详细模型参数和负荷等值异步电动机的详细模型参数。这种方法既达到了参数聚合的目的,又减少了计算时间。对IEEE10机39节点系统和简单配电系统进行仿真,并与频域法相比较,结果表明了该等值方法的有效性。 相似文献
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This paper presents new aggregation algorithms for obtaining reduced order power networks when coherent generators are aggregated. The generation terminal bus aggregation algorithm in the EPRI DYNRED software tends to stiffen the reduced order network during the aggregation process, thus increasing the frequencies of inter-area modes. The inertial and slow coherency aggregations will decrease the stiffening effect and produce, for the same coherent machine groups, aggregate networks with improved inter-area mode approximations. This paper contains new procedures to construct these aggregate networks and demonstrates the benefits of these new aggregate networks on a 48-machine power system using eigenvalues and nonlinear simulations 相似文献
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基于同调机群识别的动态等值方法的工程应用 总被引:12,自引:7,他引:5
在PSS/E环境下建立了大规模电力系统的动态等值模型,动态等值包括发电机同调机群的识别、同调机的聚合和网络化简.发电机同调机群的识别采用时域仿真方法,同调机的聚合采用经典模型,网络化简采用拓扑化简.以华东电网为例,阐述了等值系统的建立过程,并对等值系统和原型系统进行了仿真分析和比较,仿真结果表明,等值系统可以很好地再现原型系统的动态特性. 相似文献
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Yuan-Yih Hsu Chuan-Sheng Liu Tain-Syh Luor Chung-Liang Chang Ah-Shing Liu Yung-Tien Chen Chiang-Tsung Huang 《Power Systems, IEEE Transactions on》1996,11(2):747-753
Experience with the identification and tuning of exciter constants for a generating unit at the second nuclear power plant of the Taiwan Power Company is reported. A field test is first performed on the excitation system with the generator open-circuited. Since the field test results differ from the computer simulation results using manufacturer's constants, the authors first modify the manufacturer's constants based on their previous experience to reach a preliminary set of parameters for the excitation system. Then a hybrid nonlinear simulation-sensitivity matrix method is developed to further refine the excitation system parameters. The exciter constants are tuned in order to give better dynamic response before a power system stabilizer is applied to the generator. Field tests are then performed in order to compare the dynamic response of the generator without and with power system stabilizer 相似文献
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单时滞电力系统时滞稳定裕度的简便求解方法 总被引:1,自引:0,他引:1
时滞稳定裕度定义为在保证小扰动稳定的前提下系统可承受的最大延时值。确定电力系统的时滞稳定裕度对于合理利用广域测量系统数据、评估广域控制效果具有重要意义。文中介绍了单时滞电力系统的数学模型;提出一种求解单时滞电力系统时滞稳定裕度的简便方法,该方法在虚轴上将特征方程转化为多项式方程求解系统的纯虚特征根,无需任何中间的变量代换,可以有效求解单时滞电力系统的时滞稳定裕度;用该方法对一个单机无穷大系统进行时滞稳定裕度研究,得到了典型运行方式下的时滞稳定裕度,并研究了励磁系统参数变化对时滞稳定裕度的影响;对结果进行了时域仿真验证,验证了该方法的准确性。 相似文献
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叙述了9E燃机EX2000励磁系统国产化改造项目背景和主要工作内容,通过试验研究破解9E燃机励磁系统的控制策略,成功地用国产RCS-9400微机型励磁调节器替代进口EX2000励磁调节器,并完成了励磁系统模型参数测辨和电力系统稳定器(PSS)整定试验,建立了可反映强励、限幅、PID和电力系统稳定器特性的RCS-9400励磁系统详细模型。 相似文献
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提出一种新型的虚拟同步发电机(VSG)设计方法,构建虚拟的励磁控制器、调速器和电磁暂态模拟单元。分别对机端电压的d、q分量引入PI控制器,以达到VSG与同步发电机(SG)具有一致响应的目的。建立VSG单机无穷大系统小信号模型,求取并分析系统特征根及其参与因子。分析惯性时间常数、励磁参数对VSG小信号稳定性的影响规律,发现其与SG相关理论吻合。同时分析PI控制参数、线路参数对系统小信号稳定性的影响。利用MATLAB/Simulink仿真验证了上述方法的正确性。 相似文献
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Direct transient stability assessment with excitation control 总被引:1,自引:0,他引:1
Fouad A.-A.A. Vittal V. Ni Y.-X. Pota H.R. Nodehi K. Zein-Eldin H.M. Vasahedi E. Kim J. 《Power Systems, IEEE Transactions on》1989,4(1):75-82
The authors extended the applicability of the transient energy function method by incorporating the exciter effects in the energy of a multimachine power system during the first swing transient. The generator was represented by the two-axis model and the exciter was represented by one gain, one time constant, and one limiter. In this study they compute the parameters of the extended transient energy function, which assumes a constant average internal EMF. The critical value of this transient energy is determined. A procedure for its use in transient stability assessment has been developed and successfully applied to fault disturbances in two test networks 相似文献
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Oliver Drubel Rolf Gantenbein Alberto Izquierdo Meinolf Klocke 《Electrical Engineering (Archiv fur Elektrotechnik)》2007,90(1):55-63
The current flow within a salient pole brushless exciter with polygon-connected winding is calculated. The winding is connected
to a rectifier, which causes transients in the winding during switching. Brushless exciters are over-dimensioned for their
rated operation. During ceiling conditions the required voltage may be two times higher and the exciter is strongly saturated.
Therefore the normal asynchronous circuit theory is no longer applicable for a detailed study within the exciter itself. A
nonlinear finite difference time stepping method with rotating rotor and diode circuits is applied instead. Basic theories
for the combination between the circuit theory and field theory are summarized in one mathematical model. Calculation results
are compared to measurements on a real power plant exciter for different operation conditions.
Rolf Gantenbein has recently passed away. 相似文献
14.
S.C. Tripathy N.D. Rao L. Roy 《International Journal of Electrical Power & Energy Systems》1981,3(3):127-133
Tieline power oscillations can occur between interconnected utility systems, especially when the power transmission angles on the interconnections are relatively large. These oscillations can be controlled, however, by readjustment of exciter and speed-governor control parameters. A third parameter that has a significant effect on the damping of the oscillations is the load-voltage characteristic of the power system. Hence the load-voltage characteristic should also be taken into account in the parameter readjustment. The paper presents a systematic method of choosing these parameters by developing a state-space model of the excitation system with a speed stabilizer that interacts with the governor control system and the load-voltage characteristic. The Lyapunov equations for the linearized system are then solved to determine the optimum set of parameters. Finally, the effect of the choice of these parameters on the transient response of the dynamical system for small load changes is presented. 相似文献
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电力系统调度与控制正面临全局统筹、紧密协同的局面,而对外部电网的等值简化是该决策顺利实施的前提和关键。由于传统等值简化方法对等值电网“源”“网”“荷”的增加或删减操作改变了其结构和主动量、被动量,从而在电网全局统筹过程中,使调度与控制的精度面临挑战。对此,在电网全景可观环境下,提出了深度聚合电网模型及其求解方法和应用。首先,给出了发电厂、联络站的聚合方法,形成聚合电网模型。并在此基础上,将聚合厂站融合到输电线路,建立了深度聚合电网模型。然后,推导了深度聚合电网模型未知量与可调控量(发电机功率)之间的函数关系,并使用长短期记忆网络对其参数进行求解。最后,以经济调度应用为例进行仿真验证,证明了所提方法的有效性。 相似文献
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考虑配电网络的感应电动机负荷模型聚合方法研究 总被引:9,自引:1,他引:9
通过对考虑配电网络的感应电动机聚合方法进行理论研究,提出了一种新的感应电动机聚合方法:根据感应电动机的空载和转子堵转2种状态计算聚合感应电动机电气参数,根据配电变压器和配电线路消耗功率计算配电网系统电抗。通过对湖南长沙榔梨220kV变电站所供配电网络的等值分析,表明该方法是有效的、可行的。 相似文献
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11相无刷励磁机故障工况数字仿真研究(一) 总被引:3,自引:1,他引:2
本文应用张量电网络理论所建立的无刷励磁机通用仿真模型,对11相无刷励磁机进行了额定工况及故障工况的仿真研究。故障工况包括一个二极管支路断开及一个二极管支路短路情况。分析了熔断器布置的有效性。励磁机电感参数由二维有限元法算得。进行了实验,理论分析与实验结果吻合。 相似文献