公开(公告)号：US11757375B2

公开(公告)日：2023-09-12

申请号：US17719789

申请日：2022-04-13

Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Inventor： Wan-Pei Chen ,  Yoshihiro Konishi ,  Kuan-Wen Chen ,  Yeh-Hsiang Ho ,  Wan-Ju Ho

IPC: H02M7/5387 ,  H02M1/00 ,  H02M1/14

CPC classification number: H02M7/53871 ,  H02M1/0009 ,  H02M1/14 ,  H02M7/53873

Abstract: A DC-AC inverter system using a state observer and a control method thereof are provided. The control method of the DC-AC inverter system includes the following steps. The state observer outputs a filter-capacitor-current estimation value at a next sampling time according to a DC link voltage at a current sampling time and a filter-capacitor-voltage actual value at the current sampling time. The filter-inductor-current estimation value at the next sampling time is compared with the filter-capacitor-current estimation value at the next sampling time to obtain a load current estimation value at the next sampling time. An inductor voltage estimator outputs a filter-inductor-voltage estimation value at the next sampling time according to the load current estimation value at the next sampling time. A feed-forward control is performed according to the filter-inductor-voltage estimation value at the next sampling time.