Temporary overvoltages (TOVs) typically caused by short-circuit faults and switching events can impose considerable damage on power system equipment. Furthermore, the penetration of distributed generations into the utility grids may intensify the problem arising from the TOVs. Despite recent research advancements, the TOV problems with current-source inverter (CSI)-based photovoltaic (PV) systems have not been investigated comprehensively. This paper proposes a combination of virtual impedance and modified switching strategy for grid-connected CSI-based PV systems. The virtual impedance-based control damps current and voltage oscillations. On the other hand, the proposed pulse width modulation strategy restricts power injection during the fault conditions. Simulation results confirm that the proposed approach effectively mitigates the TOV without controller mode switching between the standard and fault conditions.

中文翻译：

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基于电流源逆变器的并网光伏系统临时过电压缓解策略

通常由短路故障和开关事件引起的临时过电压 (TOV) 会对电力系统设备造成相当大的损坏。此外，分布式发电进入公用电网可能会加剧由 TOV 引起的问题。尽管最近的研究取得了进展，但尚未全面研究基于电流源逆变器 (CSI) 的光伏 (PV) 系统的 TOV 问题。本文针对并网 CSI 光伏系统提出了虚拟阻抗和改进切换策略的组合。基于虚拟阻抗的控制可抑制电流和电压振荡。另一方面，所提出的脉宽调制策略在故障条件下限制了功率注入。