Open-end-winding dual-inverter converters are attractive for high-voltage and high-power photovoltaic–energy storage systems because of their multilevel output capability and high DC-link voltage utilization. However, unequal power availability between the independent DC links may cause one inverter to exceed its linear modulation range, resulting in overmodulation and grid-current distortion. This paper proposes a power-sharing strategy based on reference-voltage-vector reconstruction for a dual-inverter system with a DC-link voltage ratio of 2:1. The equivalent four-level output characteristics are analyzed, and the feasible power-sharing range is derived according to the modulation index, DC-link voltages, and inverter voltage limits. Combined with 180° decoupled modulation, the proposed strategy enables flexible power transfer among the photovoltaic unit, energy storage system, and grid while keeping both inverters within the linear modulation region. OPAL-RT results demonstrate stable operation under different power-sharing modes, with the grid-side power maintained at approximately 23.2–24.1 kW. These results verify the effectiveness and feasibility of the proposed strategy.
The open-winding dual inverter topology has the advantages of a multilevel output, high DC voltage utilization, large modulation freedom, and easy fault tolerance, and is widely used in photovoltaic grid-connected systems. The open-winding photovoltaic–energy-storage converter system studied in this paper adopts this t...
Wen-Qing Cui, Pei-Yu Chen, Bin Xu et al.· Energies· 0 citations
With the rapid development of sustainable photovoltaic power generation, energy-storage-coordinated grid-connected photovoltaic systems have been widely adopted to stabilize power output and enhance grid adaptability. Aiming at the low fault tolerance of conventional photovoltaic grid-connected systems under grid volta...
Xiao-Feng Sun, Ke-Nan Zhao, Jia-Xun Teng et al.· Sustainability· 0 citations
The increasing integration of renewable energy sources has increased the demand for efficient power electronic converters for grid-connected applications. Among renewable technologies, solar photovoltaic (PV) systems are widely adopted due to their clean energy generation and modular design. Since PV arrays produce dir...
Ritu Sharma, Anurag S. D. Rai, Amol Barve· International journal of com...· 0 citations
The rapid growth of rooftop photovoltaic (PV) generation and battery energy storage is increasing the number of power-electronic inverters connected to low-voltage distribution networks, creating both new power-quality challenges and an opportunity to use existing converter capacity more intelligently. Harmonic distort...
Elgammal Adel· International Journal of Sci...· 0 citations
This paper proposes a control strategy for a modular multilevel converter (MMC)-based photovoltaic (PV) system operating under non-homogeneous irradiance and unbalanced grid voltage conditions. The considered topology integrates PV units directly into the MMC submodules, enabling distributed maximum power point trackin...
S. Barcellona, Marzio Barresi, L. Codecasa et al.· Electronics· 0 citations
Photovoltaic power sources are widely used in smart devices that operate independently of the grid yet require a long-term, stable power supply. Due to the intermittent, fluctuating, and cyclical nature of photovoltaic power generation, power supply systems for these devices often incorporate energy storage components...
Zhi-Yi Liu, Cong-Cong Li· Journal of Physics, Conferen...· 0 citations
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