Control Scheme of Spread Frequency Band for High Power Impedance Measuring Converter with Chirp Signal Injection  

作　　者：Wenli Yang Junpeng Ma Ruiting Sun Shunliang Wang Tianqi Liu 

机构地区：[1]College of Electrical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第6期2411-2422,共12页中国电机工程学会电力与能源系统学报（英文）

摘　　要：Impedance measurement is an effective solution for evaluating stability of a power system with high penetration of renewable sources.In this paper,the impedance measurement is achieved by a typical high-power impedance measuring converter(HPIM-converter)with chirp signal injection.The modulation saturation phenomenon of the HPIM-converter is revealed,and the frequency sweep boundary is analyzed in detail.To expand the rated frequency range of the HPIM-converter,a spread frequency band control scheme based on an over-modulation technique is proposed in this paper.The proposed control method enlarges the rated frequency band and can inject a disturbance voltage into the system under test with consistent amplitude in the rated frequency band.Also,a smooth transition strategy between linear modulation mode and over-modulation mode is proposed for suppressing signal fluctuation.Finally,the effectiveness of the proposed method is verified by simulation tests.

关 键 词：High-power impedance measurement device over-modulation technique smooth transition strategy spread frequency band 

分 类 号：TM46[电气工程—电器]