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arXiv 1705.00547eess.SYcs.SYmath.OC
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低惯性电力系统中动态可控并网逆变器性能权衡

Performance tradeoffs of dynamically controlled grid-connected inverters in low inertia power systems

Johns Hopkins University(约翰斯·霍普金斯大学);Lund University(隆德大学)

Yan Jiang, Richard Pates, Enrique Mallada

AI总结:

本文研究了低惯性电力系统中动态控制器设计的性能权衡,探讨了测量噪声、功率扰动和延迟对逆变器控制的影响,发现不同补偿策略在噪声抑制、扰动缓解和延迟鲁棒性上各有侧重。

摘要:

在低惯性电力系统中,利用并网逆变器实现频率响应是一种缓解动态退化的重要替代方案。然而,由于逆变器本身不具有同步发电机对功率波动的自然响应能力,因此需要通过测量频率(通常噪声较大)并调整输出功率来生成响应,这会导致延迟。本文探讨了在考虑测量噪声、功率扰动和延迟影响时,动态控制器设计的系统性能权衡。使用最近提出的动态下垂(iDroop)控制策略,该策略受经典一阶领先滞后补偿启发,表明在噪声抑制、扰动缓解和延迟鲁棒性方面,参数集并不一定有共同交集。特别是,领先补偿适用于功率扰动为主要退化源的系统,而滞后补偿则在系统受延迟或频率噪声主导时更优。进一步分析显示,iDroop在联合噪声和扰动缓解以及延迟鲁棒性方面均优于标准下垂方法。

英文摘要:

Implementing frequency response using grid-connected inverters is one of the popular proposed alternatives to mitigate the dynamic degradation experienced in low inertia power systems. However, such solution faces several challenges as inverters do not intrinsically possess the natural response to power fluctuations that synchronous generators have. Thus, to synthetically generate this response, inverters need to take frequency measurements, which are usually noisy, and subsequently make changes in the output power, which are therefore delayed. This paper explores the system-wide performance tradeoffs that arise when measurement noise, power disturbances, and delayed actions are considered in the design of dynamic controllers for grid-connected inverters. Using a recently proposed dynamic droop (iDroop) control for grid-connected inverters, which is inspired by classical first order lead-lag compensation, we show that the sets of parameters that result in highest noise attenuation, power disturbance mitigation, and delay robustness do not necessarily have a common intersection. In particular, lead compensation is desired in systems where power disturbances are the predominant source of degradation, while lag compensation is a better alternative when the system is dominated by delays or frequency noise. Our analysis further shows that iDroop can outperform the standard droop alternative in both joint noise and disturbance mitigation, and delay robustness.

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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