Abstract
Photovoltaic (PV) inverters form the backbone of PV generation. This paper proposes an all-film-capacitor, transformer-less single phase inverter for PV application. The topology is a combination of a front-end boost stage, a half-bridge (HB) inverter stage, and a buck-boost power decoupling stage. The grid ripple power is decoupled by a large swing of the HB capacitors along with a limited ripple on the dc-link thus reducing the capacitance requirement and converter volume. Being a HB derived inverter, the high frequency common mode leakage current through the PV parasitic capacitance is mitigated. Further, the dc-link average is optimally controlled to ensure a higher efficiency over wide operating load and power factor range. To validate its operation, a Silicon Carbide (SiC) based 1 kVA laboratory prototype is built and closed loop experimental results are provided at 100/75 kHz switching frequency over wide operating conditions.
Original language | English (US) |
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Journal | IEEE Transactions on Power Electronics |
DOIs | |
State | Accepted/In press - Jan 1 2018 |
Keywords
- Active power decoupling
- adaptive dc-link
- Capacitance
- capacitance optimization
- Capacitors
- common mode leakage current
- Inverters
- Reactive power
- Reliability
- singlephase transformer-less string inverter
- Topology
- wide bandgap devices
ASJC Scopus subject areas
- Electrical and Electronic Engineering