摘要
为了对电力系统中的谐波进行有效的分析和治理,该文提出了一种新的简化模型来表征谐波源的电压-电流特性。通过对周期性电压电流波形的起始时间与其相应的各次谐波分量初始相位之间的关系进行研究,指出谐波源的特性可以由其在基波电压初相位为零时的特性所唯一确定。立足于工程实际,提出了一个线性的简化模型来近似表示谐波源在基波电压初相位为零时的特性,在该模型中,各次谐波电流的实部和虚部被表示为各次谐波电压实部和 虚部的线性多项式。随后根据基波电压初相位与谐波源特性之间的内在联系,导出了谐波源在基波电压初相位不为零时的简化模型。该模型基于最小二乘逼近进行建模。对几类典型谐波源 的仿真计算表明,本模型具有足够的精度,且优于现有的其他模型。
To facilitate the work in harmonic analysis and mitigation, a new simplified harmonic source model is proposed in this paper to represent the v-i characteristics of nonlinear electric loads. Based on the investigation of the relationship between the reference time and the corresponding harmonic phase angles of periodic voltage or current waveform, it is pointed out in this paper that the property of a harmonic source can be fully determined by that with a zero fundamental voltage phase angle. From engineering point of view, a new simplified model is proposed to approximate the property of harmonic sources for the case with a zero fundamental voltage phase angle. In this model, the real and imaginary parts of harmonic currents are modeled by linear polynomials of the rectangle coordinate components of harmonic voltages. Then a more general model is introduced for any nonzero fundamental voltage phase angle cases. Least squares approximation method is used to establish the simplified model. Test results on several kinds of typical harmonic sources reveal that this simplified model is of sufficient precision, and is superior to other existing models.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第4期46-51,共6页
Proceedings of the CSEE
基金
国家自然科学基金资助项目(59737140)
关键词
电力系统
谐波
谐波源
简化模型
最小二乘逼近
power system harmonics
harmonic sources simplified model
least squares approximation
