Design and implementation of three-phase two-bridge advanced neutral point clamped three-level photovoltaic inverter

Yuan, Liqiang; Cao, Yang; He, Fei; Ma, Jing; Chen, Zhiping; Lü, Tao; Zhao, Zhengming

doi:10.1109/icems.2014.7013597

Cited by 3 publications

(4 citation statements)

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“…Currently, it is commercialized by Conergy in string inverter IPG series (2-5 kW), with extreme efficiency of 96.1% (Photon International, July 2007) and a maximum European efficiency of 95.1% [71,73,74]. [71,73,74].…”

Section: Discussionmentioning

confidence: 99%

Section: Conergy Npc Invertermentioning

confidence: 99%

“…An alternative of the same concept topology is depicted in [50], where instead of HB, a FB is used and in place of series connection, a parallel connection of unidirectional clamping switches is carried out. Figure 20 [72,73] = ON and S-, D-= ON, (b) S+ (S-) and S1 (S2) are switched at high frequency. …”

Section: Conergy Npc Invertermentioning

confidence: 99%

“…The NPC HF inverter is based on the main concept in which zero voltage is acquired by utilizing S+ or S-based on the sign of the current, the output is clamped to middle point (ground) of the DC bus, as presented in Figure 20 [72,73]. The main functions of Conergy NPC topology are: (a) the possible zero voltage conditions are: S+, D+ = ON and S-, D-= ON, (b) S+ (S-) and S1 (S2) are switched at high frequency.…”

Section: Advantagesmentioning

confidence: 99%

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A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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Abstract:The research significance of various scientific aspects of photovoltaic (PV) systems has increased over the past decade. Grid-tied inverters the vital elements for the effective interface of Renewable Energy Resources (RER) and utility in the distributed generation system. Currently, Single-Phase Transformerless Grid-Connected Photovoltaic (SPTG-CPV) inverters (1-10 kW) are undergoing further developments, with new designs, and interest of the solar market. In comparison to the transformer (TR) Galvanic Isolation (GI)-based inverters, its advantageous features are lower cost, lighter weight, smaller volume, higher efficiency, and less complexity. In this paper, a review of SPTG-CPV inverters has been carried out. The basic operational principles of all SPTG-CPV inverters are presented in details for positive, negative, and zero cycles. A comprehensive analysis of each topology has been deliberated. A comparative assessment is also performed based on weaknesses, strengths, component ratings, efficiency, total harmonic distortion (THD), semiconductor device losses, and leakage current of various SPTG-CPV inverters schemes. Typical PV inverter structures and control schemes for grid connected three-phase system and single-phase systems are also discussed, described, and reviewed. Comparison of various industrial grids-connected PV inverters is also performed. Loss analysis is also performed for various topologies at 1 kW. Selection of appropriate topologies for their particular application is thoroughly presented. Then, discussion and forthcoming progress are emphasized. Lastly, the conclusions are presented. More than 100 research publications on the topic of SPTG-CPV inverter topologies, configurations, and control schematics along with the recent developments are thoroughly reviewed and classified for quick reference.

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