可适应电压波动环境的谐波源频域卷积模型

Frequency Domain Convolution Model of Harmonic Source Adapting to Voltage Fluctuation Environment

针对现存谐波源模型中普遍采用常量参数,难以适应背景电压变化的环境,模型精度较低等问题,该文提出一种精度更高的谐波源频域卷积模型和相应模型参数的求解方法。分析谐波源端口电压、电流在频域下应满足的卷积关系,并建立频域卷积模型,随后得出模型相关参数在具体谐波源网络中的构成特点,并分析模型理论误差来源,提出运用偏最小二乘法和逐步回归分析法对模型参数进行筛选求解,并在Matlab/Simulink环境下通过对比验证了模型的精度。仿真结果表明,所提出的谐波源频域卷积模型在背景电压波动的场景中仍保持较高精度,更适应于在实际电力系统谐波源建模中采用。

The constant parameter model is widely used in the existing harmonic source, which is difficult to adapt to the background voltage-changing environment, and the model accuracy is low. A higher precision harmonic frequency domain convolution model was proposed as well as the model parameters solving method. The convolution relation of harmonic source voltage and current in the frequency domain was analyzed, and the convolution model was established. Then, the characteristics of the model parameters in the specific harmonic source network were obtained and the sources of theoretical errors were analyzed. The partial least squares and stepwise regression were used to screen and solve the model parameters. The accuracy of the model was verified by comparison using Matlab/Simulink. The simulation results show that the proposed model still has remarkable accuracy in the background voltage fluctuation environment, and is more suitable for the application in actual power system.