共查询到20条相似文献，搜索用时 156 毫秒
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杜晓沉 《安徽教育学院学报》2014,(3)
本文针对谐波对电力系统的影响和谐波治理的现状,在当前研究水平的基础上,在MATLAB的平台上开发了电力系统谐波潮流计算程序,其中包括谐波分析中的各种系统元件的建模、系统节点导纳矩阵的形成、对称系统的谐波潮流计算等分析功能。本文采用算例进行具体计算,并将其计算结果在ETAP软件中进行了仿真,其结果表明了该程序的正确性和实用性。 相似文献
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万乐 《江西电力职业技术学院学报》2012,25(2):17-20
随着风电规模的日益扩大,风电对电力系统的影响越来越大,由风电并网引起的电力系统运行的经济性和稳定性等全局性问题越来越受到人们的关注。其中含风电场的电力系统经济调度问题日益受到重视,储能装置是解决风电并网问题的有效手段。本文不考虑储能装置的初始投资、运行维护费用等问题,从平滑风电功率波动和平滑系统功率波动(即综合考虑风电波动和负荷波动)两个角度,研究了储能装置的容量及最大充放电功率对平滑效果的影响,初步探讨了风电场中储能装置参数的确定方法。 相似文献
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《实验室研究与探索》2015,(11)
为加强学生对潮流计算的理解和掌握,研究了MATpower在潮流计算实验教学中的应用。设计了一个5机12节点的简单电力系统,介绍了其结构参数特点,详细说明了该系统基于MATpower的潮流计算程序的具体实现方法,分析了仿真后的数据结果;实验结果表明,该电力系统设计正确,潮流计算程序编写无误,真实反映了电力系统各变量的属性和内部规律。通过这一过程,强化了学生在潮流计算学习中需要注意的问题,加深了学生对潮流计算理论知识的理解,这对潮流计算的理论和实验教学具有重要意义。 相似文献
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对电力系统结构图进行建模,采用电力系统潮流计算的方法,分析了电力系统各母线电压、电流和各个元件流过的功率损耗。并通过Simulink软件进行了仿真,验证了计算结果的正确性和可靠性。 相似文献
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罗斌 《吉林广播电视大学学报》2012,(6):25-26
风电场高压动力电缆是风电场电力系统的重要组成部分,其绝缘击穿是典型的电气和安全事故。通过对电缆的设计和选型,外部电网的电压波动,电缆的测试盒施工方面的分析,找到事故起因并采取整改和预防措施,杜绝此类事故,使风电场电力系统良好运转。 相似文献
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基于分散式风电并网,提出3种并网模式,即通过35 k V专线接入110 k V变电站35 k V母线侧(模式1);通过35 k V专线接入35 k V变电站35 k V母线侧(模式2);分散式风电T接入35 k V线路(模式3)。利用电力系统综合分析程序(PSASP)软件搭建了一个实际配电网的电网模型,并分别就这3种并网模式进行仿真研究。通过对分散式风电并网对电网带来的潮流分布、短路电流变化和网损影响的研究,表明3种分散式风电并网模式都是可行的方案,得到并网模式1对并网变电站潮流流向和电压质量的影响最小,对短路电流改变最小,短路容量比最小,同时并网模式1对电网的网损最小。对比分析给出模式1是3种并网模式中最优的。 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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JIANG Zhi-chao DOI Yasuaki ZHANG Shu-you 《浙江大学学报(A卷英文版)》2007,8(9):1414-1421
Straight Darrieus wind turbine has attractive characteristics such as the ability to accept wind from random direction and easy installation and maintenance. But its aerodynamic performance is very complicated,especially for the existence of dynamic stall. How to get better aerodynamic performance arouses lots of interests in the design procedure of a straight Darrieus wind turbine. In this paper,mainly the effects of number of blades and tip speed ratio are discussed. Based on the numerical investigation,an assumed asymmetric straight Darrieus wind turbine is proposed to improve the averaged power coefficient. As to the numerical method,the flow around the turbine is simulated by solving the 2D unsteady Navier-Stokes equation combined with continuous equation. The time marching method on a body-fitted coordinate system based on MAC (Marker-and-Cell) method is used. O-type grid is generated for the whole calculation domain. The characteristics of tangential and normal force are discussed related with dynamic stall of the blade. Averaged power coefficient per period of rotating is calculated to evaluate the eligibility of the turbine. 相似文献
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基于小干扰稳定的概念和分析方法,通过3种不同类型的风电机组,采用PSAT软件中的特征值分析方法,研究风电机组在类型不同、风电场接入距离不同以及风电渗透率不同情况下接入WSCC 3机9节点系统时对小干扰稳定性的影响。研究结果表明:风电机组类型、接入距离以及风电渗透率均会对系统产生不同程度的影响。DFIG的影响优于另外两个机组,在风电机组确定的情况下,距离越近、风电渗透率越低对系统的小干扰稳定性越有利。 相似文献
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风电场接入配电网引起的电压偏差不仅由风电场装机容量与配电网接入点的短路容量之间的比值K值决定,还与配电网阻抗角及风电场功率因数有关.通过具体算例的计算,给出不同情况下接入配电网的风电场的最大装机容量的建议. 相似文献
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INTRODUCTIONWindenergyofabout2.531011Wavailableeverywhere,especiallyincoastalregions,deserts,grasslandsandcountrysideareasinChina,ispol-lutionfreeandrenewable(Xueetal.,2001).Useofwindenergycanimprovethelivingandworkingconditionsofpeople.Themanyelectricitygen-eratorsdrivenbywindpowerallovertheworldefficientlyextractwindenergyforconversionintoelectricalenergy.Manyregions,suchascountry-sideandruralareashavehighdensityofwindpower,buttheconditionsarenotgoodenoughforestablishingahighelectricpo… 相似文献
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Wind energy is a pollution free and renewable resource widely distributed over China. Aimed at protecting the environment and enlarging application of wind energy, a new approach to application of wind energy by using compressed air power to some extent instead of electricity put forward. This includes: explaining the working principles and characteristics of the wind energy-compressed air power system; discussing the compatibility of wind energy and compressor capacity; presenting the theoretical model and computational simulation of the system. The obtained compressor capacity vs wind power relationship in certain wind velocity range can be helpful in the designing of the wind power-compressed air system. Results of investigations on the application of high-pressure compressed air for pressure reduction led to conclusion that pressure reduction with expander is better than the throttle regulator in energy saving. 相似文献
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Grid-connected inverter for wind power generation system 总被引：3，自引：0，他引：3
In wind power generation system the grid-connected inverter is an important section for energy conversion and transmission, of which the performance has a direct influence on the entire wind power generation system. The mathematical model of the grid-connected inverter is deduced firstly. Then, the space vector pulse width modulation (SVPWM) is analyzed. The power factor can be controlled close to unity, leading or lagging, which is realized based on PI-type current controller and grid voltage vector-oriented control. The control strategy is verified by the simulation and experimental results with a good sinusoidal current, a small harmonic component and a fast dynamic response. 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