Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 9, Issue 2, Pages 2122-2135Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.2968914
Keywords
Inverters; Capacitors; Topology; Frequency conversion; Modulation; Voltage control; Power conversion; Isolated cascade inverter; multibus dc connection; photovoltaic (PV) generation systems
Categories
Funding
- National Natural Science Foundation of China [51877035]
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This study proposes a novel photovoltaic inverter topology based on multibus DC collection that achieves isolated cascade configuration, reducing system volume and eliminating voltage-balancing control. The effectiveness of this topology was confirmed through simulation and experimental results.
This article proposes a novel single-stage isolated cascade photovoltaic (PV) inverter topology based on a multibus dc collection. The PV power plant can be divided into many arrays, each of which supplies power to three cascaded isolated inverter units through a dc bus. This isolated inverter unit is composed of cascade isolated bridge cells (I-BCs) connected in input-parallel output-series (IPOS). Compared with a conventional two-stage isolated cascade PV converter, the proposed PV topology can totally eliminate the individual dc-link capacitors at the high-voltage (HV) side, which leads to extremely reduced system volume and eliminated the voltage-balancing control between the dc-link capacitors. This article, first, describes the basic principle and the carrier phase shift pulse-width modulation (CPS-PWM) applied to this topology and, then, analyzes the power balance constraints between the cascade three-phase units for the PV grid-connected system. Finally, the effectiveness of the novel topology is verified by the simulation and experimental results.
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