Multi‐input battery‐integrated single‐stage DC‐DC converter for reliable operation of solar photovoltaic‐based systems

Abstract

Summary Solar photovoltaic (PV) systems are emerging progressively due to their wide compatibility range, ease of installation, and environmental friendliness. The module mismatch (MM) losses and module open circuit (MOC) fault can cause the power mismatch between different PV modules. This significantly affects the energy output from the PV module. Also, the intermittent nature of solar PV power makes the solar PV systems unreliable; to compensate for this, conventional PV systems utilize a battery storage system (BSS) with separate bidirectional converter. These bidirectional converters require two‐stage power conversion and massive battery bank connected at the DC link. This leads to the further reduction in overall efficiency. To address these issues, this paper proposed a multi‐input PV battery system (MIPBS) that uses nonisolated buck and boost converter combinations. It requires single‐stage power conversion to extract maximum power from each PV module along with BSS charging and discharging. Its modular design allows it to function across a wide range of voltage, power, and BSS choices. The proposed system is capable of mitigating the MM loss and sustaining the MOC fault. This paper discusses the operation, steady‐state analysis, and dynamic analysis of the proposed MIPBS. The performance of the proposed MIPBS is validated using a state‐of‐the‐art experimental setup with two PV modules, each having a rating of 60.53 W.

Double‐input triple‐output non‐isolated DC–DC converter based on coupled inductor with high step‐up output voltages

“…There are two techniques that have been presented for achieving high voltage gain: (1) using a coupled inductor in the power circuit [8][9][10][11][12][13] and (2) utilizing voltage multiplier (VM) cells, which consist of switch-capacitor, switch-inductor, and switch-capacitor-inductor cells. [14][15][16][17][18][19][20][21] Increasing the number of switches, capacitors, and inductors in the power circuit increases the voltage gain, but it also decreases efficiency due to the increased number of components. Therefore, there is a tradeoff between high voltage gain and efficiency.…”