基于谱序列变换的实验室用电谐波深度控制研究

Research on Harmonic Depth Control of Laboratory Power Supply Based on Spectrum Sequence Transformation

实验室用电谐波参数取值范围难以确定,导致实验室用电谐波深度控制质量下降,以解决该问题作为研究目标,设计基于谱序列变换的实验室用电谐波深度控制方法;根据谱序列变换原则估算实验室用电谐波参数取值范围;根据估算结果建立多电平逆变器,提取DFT、DSC谐波并分析其波动特性,提取实验室用电谐波特征;设计谐波控制器架构,通过计算死区补偿向量与控制参数的方式,实现对用电谐波的深度控制;对比实验结果表明,所设计方法可将电流谐波控制在6.8~12.4 A的范围之内,可将电压谐波控制在180~220 V的范围之内,电压与电流谐波畸变率始终处于较低的水平,能够快速使实验室电力系统恢复正常,大幅提升电量谐波的稳定性,解决电力损耗问题。

It is difficult to determine the value range of the laboratory power harmonic parameters,which leads to the decline of the quality of the laboratory power harmonic depth control.In order to solve this problem as a research objective,a laboratory power harmonic depth control method based on the spectral sequence transformation is designed.According to the principle of the spectral sequence transformation,the harmonic parameter range of laboratory electricity is estimated.According to the estimation results,a multilevel inverter is established to extract the harmonics of DFT and DSC,analyze their fluctuation characteristics,and extract the harmonic characteristics of laboratory electricity.The harmonic controller architecture is designed to realize the deep control of power harmonics by calculating the dead zone compensation vector and control parameters.The comparative experimental results show that the designed method can control current harmonics within the range of 6.8~12.4 A,and voltage harmonics within the range of 180~220 V.The distortion rate of voltage and current harmonics is always at a low level,which can quickly restore the laboratory power system to normal,greatly improve the stability of electricity harmonics,and solve the problem of power loss.