AUTHOREA
Log in
Sign Up
Browse Preprints
LOG IN
SIGN UP
Essential Site Maintenance
: Authorea-powered sites will be updated circa 15:00-17:00 Eastern on Tuesday 5 November.
There should be no interruption to normal services, but please contact us at
[email protected]
in case you face any issues.
Huaiyu Zhang
Public Documents
1
A transformerless Z-Source photovoltaic grid-connected inverter with coupled inductor...
Yunzhong Dai
and 1 more
May 09, 2023
The quasi-Z-source H-bridge grid-connected inverter (QHGCI) is well known with its advantages of the void of shoot-through problem and the high DC-voltage utilization. But the existence of the common-mode leakage current in the power frequency cycle, lower power density and higher thermal stress makes it hardly applicable to the grid-penetrating application. Thus with a purpose to conquer the problem relating to the QHGCI, an innovative transformerless Z-Source photovoltaic grid-connected inverter with coupled inductor coil (TZPGCI-CIC) is proposed. The circuitry topology and an unipolar SPWM strategy are firstly introduced in short. And thereafter the common-mode voltage in the whole working process is derived and evaluated through the detailed operating mode analysis, in which a constant value of it has been theoretically revealed. Lastly, a prototype platform of TZPGCI-CIC is setup and its good performance on leakage current suppression, lower thermal stress are validated with the experimental results.