arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.06707eess.SYcs.SY
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频率成形控制

Grid-forming frequency shaping control

Yan Jiang, Andrey Bernstein, Petr Vorobev, Enrique Mallada

摘要:

随着电力系统过渡到高可再生能源渗透的状态,很少或根本没有同步发电机的存在使得电网跟随逆变器的良好调节频率的先决条件变得不现实。因此,有一种趋势是诉诸直接设置频率的并网逆变器。我们提出了一种新的网格形成频率整形控制,能够形成聚合系统的频率动态到一阶一个所需的稳态频偏和频率变化率(RoCoF)后,突然的功率不平衡。由一阶动态产生的无过冲特性允许系统频率单调地向其新的稳态移动而不经历频率最低点,这大大提高了频率安全性。我们证明了我们的网格形成频率整形控制,使系统内部稳定的温和的假设下。所提出的控制的性能进行了验证,通过数值模拟修改后的冰岛电网的测试情况。

英文摘要:

As power systems transit to a state of high renewable penetration, little or no presence of synchronous generators makes the prerequisite of well-regulated frequency for grid-following inverters unrealistic. Thus, there is a trend to resort to grid-forming inverters which set frequency directly. We propose a novel grid-forming frequency shaping control that is able to shape the aggregate system frequency dynamics into a first-order one with the desired steady-state frequency deviation and Rate of Change of Frequency (RoCoF) after a sudden power imbalance. The no overshoot property resulting from the first-order dynamics allows the system frequency to monotonically move towards its new steady-state without experiencing frequency Nadir, which largely improves frequency security. We prove that our grid-forming frequency-shaping control renders the system internally stable under mild assumptions. The performance of the proposed control is verified via numerical simulations on a modified Icelandic Power Network test case.

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