基于小波变换的电力系统谐波有源补偿方法研究  

Research on Active Harmonic Compensation Method of Power System Based on Wavelet Transform

作　　者：李仕杰 LI Shijie(State Grid Zhejiang Haining Power Supply Co.Ltd.,Jiaxing 314400,China)

机构地区：[1]国网浙江海宁市供电有限公司,浙江嘉兴314400

出　　处：《工业加热》2022年第2期64-68,共5页Industrial Heating

摘　　要：为了保证电力系统的安全运行,提出基于小波变换的电力系统谐波有源补偿的方法。基于电力系统谐波有源补偿原理,有效结合塔式算法与小波变换,经离散信号的分解处理后,实现系统谐波检测;依据电流跟踪控制环节的参考电流,通过流压转换确定参考电压矢量,采用改进空间矢量脉宽调制控制策略,控制三相逆变器实际输出电压跟踪参考电压,实现电力系统的谐波补偿。经测试:该方法对信号分解时,在第四层就可获取基频波形,具备较好的谐波检测效果;并且补偿后的电网电流预测值与实际值误差较小,具备较好的谐波有源补偿效果。In order to ensure the safe operation of power system, an active harmonic compensation method based on wavelet transform is proposed. Based on the principle of harmonic active compensation in power system, the tower algorithm and wavelet transform are effectively combined to realize the system harmonic detection after the decomposition of discrete signal;According to the reference current of current tracking control link, the reference voltage vector is determined by current voltage conversion, and the improved space vector pulse width modulation control strategy is adopted to control the actual output voltage of three-phase inverter to track the reference voltage, so as to realize the harmonic compensation of power system. The test results show that when the signal is decomposed, the fundamental frequency waveform can be obtained in the fourth layer, which has good harmonic detection effect;Moreover, the error between the predicted value and the actual value of the grid current after compensation is small, which has a good harmonic active compensation effect.

关 键 词：小波变换 电力系统 谐波 有源补偿 流压转换 信号分解 

分 类 号：TM713[电气工程—电力系统及自动化]