Abstract
With the development of renewable energy technology, distributed power supply mode with multi energy and multi-directional power flow including utility grid, renewable energy and energy storage unit has gradually become a research hotspot. An AC/DC hybrid multi-port power routing (MPPR) system which based on partial power conversion (PPC) of dual DC buses is proposed in this paper. The photovoltaic (PV) port, the battery port and two DC voltage buses form a power router. PV maximum power point tracking (MPPT) and high-voltage ride through (HVRT) of the grid-tied inverter are implemented by the same auxiliary port voltage modulation. The PPC based PV conversion features that only the power determined by voltage difference between PV panel and the series connected DC bus is dealt with, which significantly reduces the loss compared to the full power conversion (FPC) for PV. The detailed control schemes of all converters and energy transmit are given. The simulation and experimental results verify the effectiveness of the proposed scheme.
Highlights
In order to reduce the use of fossil fuels and carbon dioxide emissions, renewable energy such as PV system has developed rapidly [1]–[4], and the efficiency improvement and cost optimization of PV conversion have been studied deeply
The single-stage PV power generation system has the advantages of low cost, small volume and high efficiency [5]–[7], but in low PV power condition the grid connected inversion can not be implemented
Partial power conversion, which can be used in nonisolated conversion applications, has high efficiency and low cost feacures as it only accounts for a small proportion of the total power of the system [11]–[14]
Summary
In order to reduce the use of fossil fuels and carbon dioxide emissions, renewable energy such as PV system has developed rapidly [1]–[4], and the efficiency improvement and cost optimization of PV conversion have been studied deeply. In order to improve the energy utilization of the PV-battery grid-connected system, with the help of the mature application experience of the integration of microgrid and information technology, the electrical power router has the communication and intelligent decision-making capabilities, and is able to realize the active management of the power network energy flow according to the operation state of the network and the instructions of users and control center, at the same time improving the system energy utilization effectively [18]. Reference [12] proposed a triple-port power routing converter integrating PV and battery power for high step-up applications, and proposed a control strategy that used energy storage to maintain the MPPT of PV under different lighting conditions and load conditions, which realized the multi-mode and efficient operation of the PV power generation system. In the last section the characteristics of the proposed topology scheme are summarized
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