共查询到16条相似文献,搜索用时 62 毫秒
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本文分别对纯电阻电路和电抗电路的最大功率传输原理进行了较为详细的分析,得出了各自在不同条件下的阻抗匹配条件,为最大功率传输的设计提供了一定的参考依据. 相似文献
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本文讨论了当电源电压、内阻及负载可变时最大功率传输条件及最大功率值的求法,同时讨论了最大功率传输时电源的效率问题。 相似文献
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李琪宏 《中学物理教学参考》2006,35(6):33-34
在纯电阻电路中,负载上如何获得最大功率是讨论电源输出功率时常常遇到的问题。对于电源外接电阻(负载)变化的电路,在什么情况下,负载上可获得最大功率呢? 相似文献
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将专业基础课"电路原理"中的最大功率传输定理与后续专业知识及实际应用相结合,提出了基于开关电路的最大功率传输定理的实验方案,并对该方案进行了设计和实现,搭建了实验平台,实验效果达到了预期目标。 相似文献
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提出了采用最大功率点跟踪技术提高太阳电池的输出功率.跟踪器实时调整太阳电池的输出,电压和电流,使其工作在最大功率点上.建立了最大功率跟踪的测量装置,并可直接对比有、无跟踪条件下的输出功率.本实验条件下,采用最大功率跟踪后,其平均功率增益可达10.61%. 相似文献
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利用BISAR 3.0程序,分析沪宁高速公路扩建工程的实体路面结构受力情况,得出不同荷载与层间接触条件下,路面结构拉应变、最大剪应力、竖向剪应力、拉应力的分布特征与变化规律,在此基础上,又分析了对路面使用性能的影响。结果表明:超载引起半刚性基层、沥青面层、底基层两个界面层间滑动,进而使整个路面结构受到破坏。 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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The definition of reactive power for non-sinusoidal conditions is a controversial issue. The mathematical treatment of nonlinear loads in power systems is also unsettled. This paper starts with the decomposing of apparent power in,the cases of linear and nonlinear loads. When harmonics are present, apparent power is composed of active power, reactive power, and disturbed reactive power. Linear element can be defined as the element without disturbed reactive power. This definition is based on a practical engineering concept which can separate the contribution from the apparent power into utility-duty part and custom-duty part. The field investigation of home-used facilities was conducted. Also the data acquisition in the 0.4 kV distribution systems was completed. Moreover, the loss increase due to the nonlinear loads was estimated. Nonlinear loads can be a dominant effect with respect to reactive power and power factor. Field data from a number of nonlinear load types indicate that the disturbed reactive power can cause significant losses in utility supply systems. 相似文献