A Novel Parallel Dual-frequency Grid-connected Inverter Topology and Efficiency Analysis

Yang, Liyong; Chang, A.Y.; Liu, Shuo; Wang, Yuan; Xin, Dixi; Xie, Xu; Han, Shuo

doi:10.23919/icpe2019-ecceasia42246.2019.8797343

Cited by 1 publication

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compared with the IDB‐DFI in Yang et al 26 and traditional dual‐frequency grid‐connected inverter in Yang et al, 24 the CDB‐DFI adopts a common DC bus, which can simplify the topology, reduce the cost, and suppress the leakage current effectively. The power unit of the inverter in Yang et al 24 adopts H‐bridge topology, but the power unit of the CDB‐DFI adopts HERIC topology, which can improve the efficiency. However, there may be circulating current between the two units of the CDB‐DFI flowing through the common DC bus.…”

Section: Topology and Performance Analysis Of The Cdb‐dfimentioning

confidence: 99%

See 1 more Smart Citation

Analysis and control of single‐phase transformerless dual‐frequency grid‐connected inverter

Chen,

Wang,

Yang

et al. 2023

Circuit Theory & Apps

Self Cite

View full text Add to dashboard Cite

SummaryTo simplify the inverter topology and suppress the leakage current more effectively, a novel transformerless dual‐frequency grid‐connected inverter with a common direct current (DC) bus is proposed. The proposed inverter retains the advantages of the traditional dual‐frequency inverter such as high efficiency and absence of resonance. In the novel topology, the power unit adopts the highly efficient reliable inverter concept (HERIC) topology with a unipolar modulation strategy, and the auxiliary unit adopts the H‐bridge topology with a bipolar modulation strategy. It is verified that the circulating current between the two units can be eliminated in the proposed inverter. The sensitivity of the circulating current is discussed by considering the tolerance of the filter inductances. In the leakage current equivalent circuit, the DC bus of the power unit is connected to the grid through a low‐impedance branch in parallel with the parasitic capacitance. Therefore, the leakage current is effectively suppressed. Finally, the experimental results are provided to verify the performance of the inverter.

show abstract

Section: Topology and Performance Analysis Of The Cdb‐dfimentioning

confidence: 99%

“…The concept of the dual‐frequency grid‐connected inverter is proposed to improve the efficiency of the isolated grid‐connected inverter, 24 which is composed of a power unit and an auxiliary unit. In Figure 1, the two units are connected in parallel with the grid.…”

Section: Introductionmentioning

confidence: 99%