摘要
逆变电源现有的电压反馈控制如电压外环电流内环双环控制、无差拍控制和有效值控制等都无法消除对谐波跟踪的静差,从而难以控制电压谐波发生器输出高精度电压谐波。为了解决上述问题,提出了基于快速傅里叶变换(fast Fourier transform,FFT)的三环控制策略,首先分析数字双环控制系统的频率响应特性,在具有良好动态性能的双环控制系统基础上,增加FFT外环;接着设计了频域上实部和虚部的解耦环节,在频域上对每个谐波分量的实部、虚部分别进行控制进而消除静差;最后,设计基于最少拍离散系统的FFT外环控制器。实验结果表明,该控制算法不仅具有较高的动态性能,而且能消除谐波跟踪静差。
Current voltage feedback control of the inverter source such as double loop control with voltage outer and current inner loop,deadbeat control and root mean square（RMS）control can＇t remove static error of harmonic track and is hard to control the voltage harmonic generator to output high precision voltage harmonic.In order to solve the above problem,this paper presents the three loop control strategy based on fast Fourier transform（FFT）.It firstly analyzes frequency response characteristic of the digital double loop control system and add FFT outer loop on the basis of a double loop control system with good dynamic property.Secondly,it designs decoupling links for the real part and the imaginary part in the frequency domain,and respectively takes control on the real part and the imaginary part of each harmonic component and then removes static error.Finally,it designs FFT outer loop controller based on the minimum beat discrete system.The experimental results indicate this control algorithm has higher dynamic property and is able to remove static error of harmonic track.
作者
黄骏翅
曾江
杨林
HUANG Junchi;ZENG Jiang;YANG Lin(School of Electric Power, South China University of Technology , Guangzhou , Guangdong 510640 , China)
出处
《广东电力》
2018年第4期103-107,共5页
Guangdong Electric Power
关键词
电能质量
电压谐波
逆变器
三环控制
FFT
electric power quality
voltage harmonic
inverter
three loop control
FFT
