摘要
台式计算机(desktop personal computer,PC)是一种典型的负载谐波源,其量大面广的分布式特性对研究其谐波规律的造成困难。基于台式计算机电源的基本电路,提出一种频域谐波模型,将计算机电源的时域非线性特性表达成频域线性导纳矩阵的形式。该模型除了可被应用于谐波潮流分析外,还能用于分析电源谐波电压对其谐波电流的影响,即衰减效应,因为其耦合了PC负荷输入端的各次谐波电压、电流。由于模型的推导是基于其基本电路,因此该模型可推广到其他具有类似电源电路的装置。仿真和实验结果验证了模型的准确性。用所提模型对该类非线性负载衰减特性的研究表明,衰减效应仅在特定的谐波相位区间内产生,与电源电压的波峰系数关联性极大。
Desktop personal computer （desktop PC） is a typical harmonic-source load. The mass and distributed installation of PCs in power system brought difficulties to the harmonic analysis. Based on the PC＇s generic circuit, this paper developed a frequency-domain harmonic model, which transfers nonlinear characteristics of PCs in the time-domain to linear admittance matrices in the frequency-domain. Besides the application on frequency domain harmonic power flow solution, the model can also be used to analyze the impact of the harmonic voltages on the harmonic currents, i.e. attenuation effect, since it couples all harmonic voltages and currents. Furthermore, the presented model can be extended to other loads employing the similar circuit since it was derived by the generic circuit. This model has been verified by simulations and measurements as well. Investigation of the attenuation characteristics for such loads indicates that the attenuation effect only occurs in a particular harmonic phase angle range, and is strongly correlated to the crest factor of the supply voltage.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第25期122-129,共8页
Proceedings of the CSEE
基金
重庆市自然科学基金项目(CSTC
2009BB3032)
重庆大学"211工程"三期建设(S-09111)~~
关键词
台式计算机
谐波
频域谐波模型
衰减效应
desktop PC
harmonic
frequency-domain harmonic model
attenuation effect
