A ripple suppression strategy based on virtual self-injection APF for quasi-Z source inverter

2018 International Conference on New Energy and Future Energy System

Wei, R.Y.^1 ; Tang, Y.F.^1 ; Wang, S.J.^2 ; Li, Z.Y.^1

School of Information Science and Engineering, Central South University, Hunan Province Changsha

410083, China^1

Design and Research Institute CO. LTD. of CREEC, Yunnan Province Kunming

650200, China^2

关键词: Active power filters;    Circuit structures;    Current ripples;    Double frequency;    Ripple suppression;    Small signal model;    Voltage ripples;    Z-source inverter;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012065/pdf
DOI  :  10.1088/1755-1315/188/1/012065

来源: IOP

【 摘 要 】

The power flows between the DC side and AC side of single-phase quasi-Z source inverter (QZSI) causes double-frequency (2ω) voltage ripple of capacitors, current ripple of inductors. This paper proposes a virtual self-injection active power filter (APF) ripple suppression strategy for the single-phase QZSI without changing the circuit structure, and the 2ω ripple is suppressed by controlling the shoot-through duty cycle based on the thought of ripple vector cancellation. The 2ω ripple model and its generation mechanic for single-phase QZSI are presented through the analysis of the power flows and small signal model for quasi-Z network. Simulation results verify the proposed ripple suppression strategy can effectively reduce the 2ω current ripple of inductors from 18.38% to 3.54%.