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arXiv 2411.03220eess.SYcs.SY
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基于虚拟振荡器的构网型控制器统一故障穿越技术

A Unified Fault Ride Through Technique for Virtual Oscillator based Grid Forming Controllers

Ritwik Ghosh

AI总结:

本文针对虚拟振荡器构网型控制器,提出一种统一故障穿越技术,通过量化故障动态并统一电流电压同步,在三相及不平衡故障下保持同步并抑制功率振荡,优于现有VOCs。

摘要:

构网型技术在实现未来全可再生能源电网中起着关键作用。在各种构网型控制器中,基于虚拟振荡器(VO)的控制器(VOCs)是最先进的。VOCs通过采用基于时域的实现,在动态性能和同步稳定性方面优于传统的基于下垂的构网型控制器。然而,由于基于时域的实现,用于下垂控制器的相同故障穿越(FRT)技术不适用于VOCs。现有文献已成功地在VOCs中引入限流技术,以在严重暂态条件下保护变换器。然而,现有关于VOCs的文献并未涉及FRT要求的一些非常重要的方面,例如在故障期间保持与网络的同步,在故障期间以及故障清除时最小化功率振荡。首先,本文介绍了一种独特的分析方法,用于量化VOCs在故障期间的基本动态。接下来,利用上述分析和深入推理,提出了针对VOCs的系统性开发的一种独特FRT控制架构。所提出的FRT技术在同一个架构中统一了电流和电压同步,以在三相和不平衡故障下成功工作。对所提出的控制器的性能进行了深入研究,并与现有的VOCs进行了比较。

英文摘要:

Grid-forming technology has a crucial role in achieving the future all renewable power grid. Among different types of grid-forming controllers, Virtual Oscillator (VO) based Controllers (VOCs) are the most advanced. VOCs outperform the conventional droop-based grid-forming controllers in terms of dynamic performance and synchronization stability by adapting time-domain-based implementation. However, because of the time-domain-based implementation, the same Fault Ride-through (FRT) techniques for droop-based controllers are incompatible with VOCs. Existing literature has successfully incorporated current limiting techniques in VOCs to protect the converters during severe transient conditions. Nevertheless, some very important aspects of FRT requirements are not attended to by the existing literature on VOCs, such as maintaining synchronization with the network during a fault, minimizing power oscillation during a fault, and at the fault clearance. First, this article introduces a unique analytical approach for quantifying the underlying dynamics of VOCs during faults. Next, using the mentioned analysis and in-depth reasoning, the systematic development of a unique FRT control architecture for VOCs is presented. The proposed FRT technique has unified both current and voltage synchronization in the same architecture to work successfully under three-phase and unbalanced faults. The performance of the proposed controller is thoroughly investigated and compared with existing VOCs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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