A novel cascaded H-bridge photovoltaic inverter with flexible arc suppression function

IF 1.9 Q4 ENERGY & FUELS Global Energy Interconnection Pub Date : 2024-08-01 DOI:10.1016/j.gloei.2024.08.002
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Abstract

This paper presents a novel approach that simultaneously enables photovoltaic (PV) inversion and flexible arc suppression during single-phase grounding faults. Inverters compensate for ground currents through an arc-elimination function, while outputting a PV direct current (DC) power supply. This method effectively reduces the residual grounding current. To reduce the dependence of the arc-suppression performance on accurate compensation current-injection models, an adaptive fuzzy neural network imitating a sliding mode controller was designed. An online adaptive adjustment law for network parameters was developed, based on the Lyapunov stability theorem, to improve the robustness of the inverter to fault and connection locations. Furthermore, a new arc-suppression control exit strategy is proposed to allow a zero- sequence voltage amplitude to quickly and smoothly track a target value by controlling the nonlinear decrease in current and reducing the regulation time. Simulation results showed that the proposed method can effectively achieve fast arc suppression and reduce the fault impact current in single-phase grounding faults. Compared to other methods, the proposed method can generate a lower residual grounding current and maintain good arc-suppression performance under different transition resistances and fault locations.

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具有灵活电弧抑制功能的新型级联 H 桥光伏逆变器
本文提出了一种新方法,可在单相接地故障期间同时实现光伏(PV)逆变和灵活的电弧抑制。逆变器通过消弧功能补偿接地电流,同时输出光伏直流 (DC) 电源。这种方法可有效降低残余接地电流。为了降低消弧性能对精确补偿电流注入模型的依赖性,设计了一种模仿滑模控制器的自适应模糊神经网络。根据 Lyapunov 稳定性定理,开发了网络参数在线自适应调节法则,以提高逆变器对故障和连接位置的鲁棒性。此外,还提出了一种新的消弧控制退出策略,通过控制电流的非线性下降和缩短调节时间,使零序电压幅值快速平稳地跟踪目标值。仿真结果表明,在单相接地故障中,所提出的方法能有效实现快速消弧并降低故障冲击电流。与其他方法相比,所提出的方法能产生更低的剩余接地电流,并在不同的过渡电阻和故障位置下保持良好的灭弧性能。
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来源期刊
Global Energy Interconnection
Global Energy Interconnection Engineering-Automotive Engineering
CiteScore
5.70
自引率
0.00%
发文量
985
审稿时长
15 weeks
期刊最新文献
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