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PV-to-Bus DPP Architecture Based on Unidirectional DC-DC converter for Photovoltaic Application
Guanying Chu,Huiqing Wen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Differential power processing (DPP) architecture as a promising technology is proposed now to solve the mismatch issues among photovoltaic (PV) cells. In the current study, DPP converters use the bidirectional DCDC converters, which requires at least two active switches to achieve energy extraction and energy injection. This paper proposes a PV-to-bus DPP architecture based on unidirectional flyback converter that reduces the total number of switches by half reducing the costs significantly. Furthermore, flyback converters are working in the discontinuous conduction mode (DCM).
Yinxiao Zhu,Huiqing Wen,Guanying Chu,Xingshuo Li 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
With consideration of instability in environmental conditions, the increasing installation of maximum power point (MPP) operational Photovoltaic systems (PVSs) injects an unstable power generation to the grid (such as, overloading). Aiming to reduce the instable generation during continuous peak power generation, an adaptive constant power generation (CPG) algorithm is proposed in this paper. With the proposed control, the system can operate at MPP tracking (MPPT) mode or CPG mode with the detection from system operators. When the operation mode is detected, the control will operate with self-judgment including regulate the initial mode during CPG with a simple MPP initial MPP estimation. With the estimation of MPP and internal step-size regulation, the response speed, an important factor in variable environments, can be improved. In order to evaluate the proposed scheme, simulation and experiment in different condition, such as changing irradiation and changing limit power level are carried out.