Abstract
This paper proposes a novel single-stage buck-boost three-Level neutral-point-clamped (NPC) inverter with two independent dc sources coupled for the grid-tied photovoltaic (PV) application, which can effectively solve the unbalanced operational conditions generally appearing between two independent PV sources. The proposed control scheme can simultaneously guarantee the maximum power point (MPP) operation of both PV sources and maintain the output waveform quality. Compared to the traditional two-stage PV inverter, the proposed NPC inverter could reduce the PV array voltage requirement and the voltage rating of dc-link capacitors; also it shows advantages in operational efficiency. MATLAB simulations and experimental results are presented to examine the performance of the proposed three-level NPC inverter.
Highlights
Photovoltaic(PV) power generations are widely applied in the distribution network
The mature 1500V PV panel in commercial allows the PV systems integrated into the high voltage grid (e.g. 690V) without the galvanic isolation by using the multilevel converters [8,9].the two-stage neutral-point-clamped (NPC) inverter has been used as the interfacing converter in dozens of kW PV applications, whose topology is drawn in Figure 1, where two dc-dc boost converters directly connect to the upper and lower dc rails of the traditional NPC inverter
For the effort of making compact design, this paper proposes a novel single-stage buck-boost three-level neutral-point-clamped inverter as the interfacing circuit to tie the separated PV arrays, which can reduce the mandatory requirement of front-end PV array operation voltage and dc-link capacitors’ voltage rating
Summary
Photovoltaic(PV) power generations are widely applied in the distribution network. For the purpose of increasing power conversion efficiency, the multilevel converters are preferably assumed as the interfacing converter between the PV array and the distribution grid due to its inherent operational characteristics [3,4,5,6,7], such as the reduced voltage stress, low harmonic distortion, low EMI and reduced current rating. The mature 1500V PV panel in commercial allows the PV systems integrated into the high voltage grid (e.g. 690V) without the galvanic isolation by using the multilevel converters [8,9].the two-stage neutral-point-clamped (NPC) inverter has been used as the interfacing converter in dozens of kW PV applications, whose topology is drawn, where two dc-dc boost converters directly connect to the upper and lower dc rails of the traditional NPC inverter. MATLAB simulations and experimental prototype verified the performance of proposed three-level inverter
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