This paper discusses open-circuit fault (OCF) diagnosis and fault-tolerant control strategy (FTCS) of a nonisolated DC-DC converter. The photovoltaic power conversion structure (PPCS) consists of a photovoltaic generator and an interleaved Boost converter (IBC). The maximum power point tracking (MPPT) control of the IBC ensures operation at maximum power. The design of the nonlinear Backstepping control is detailed based on the equivalent average model of IBC, and the stability is studied using Lyapunov’s theorem. The proposed OCF fault detection is based on sampling the voltage across the inductor at a much higher frequency than the switching frequency. In an OCF situation occurrence and a high control signal state, the detection of three negative samples is a condition for signaling the presence of an OCF fault; the photovoltaic system continues its normal operation. The simulation results show the validity of the proposed FTCS. The proposed diagnosis and control strategy improves the performance of the IBC in terms of cost, reliability, and service continuity.

中文翻译：

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光伏系统新诊断与容错控制策略

本文讨论了非隔离式 DC-DC 转换器的开路故障 (OCF) 诊断和容错控制策略 (FTCS)。光伏功率转换结构（PPCS）由光伏发电机和交错式升压转换器（IBC）组成。IBC 的最大功率点跟踪 (MPPT) 控制可确保以最大功率运行。基于IBC的等效平均模型详细介绍了非线性Backstepping控制的设计，并利用Lyapunov定理研究了稳定性。建议的 OCF 故障检测基于以远高于开关频率的频率采样电感两端的电压。在OCF情况发生和高控制信号状态下，检测到三个负样本是通知OCF故障存在的条件；光伏系统继续正常运行。仿真结果表明了所提出的 FTCS 的有效性。所提出的诊断和控制策略提高了 IBC 在成本、可靠性和服务连续性方面的性能。