Projected grid-forming control for current-limiting of power converters
Projected grid-forming control for current-limiting of power converters
复制标题
用于功率转换器限流的预计并网控制
DOI：
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复制
发表时间：
2019
期刊：
影响因子：
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通讯作者：
F. Dörfler
中科院分区：
文献类型：
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作者：
Dominic Gross;F. Dörfler
可持续性和弹性问题促使电力系统进行前所未有的转型，将可再生能源发电与电力电子连接起来。在此背景下，设想使用电网形成控制的电压源转换器来提供迄今为止由同步机提供的服务。与同步电机相比，电压源转换器受到严格的过电流限制。通过利用内部控制回路之间的固有时间尺度分离，网格形成参考动态（即，下垂控制、虚拟振荡器控制等以及传输网络，我们强调了众所周知的事实，即需要限制栅格形成参考动态以限制转换器输出电流而不损害稳定性。接下来，我们建议正式的问题，限制输出电流的网格形成转换器的输出电流的网格形成参考动态投影到输出电流的约束。主要的贡献是一个预计下垂控制器，可以实现仅使用本地测量。此外，我们将结果与使用虚拟阻抗的限流方法联系起来。最后，我们使用高保真仿真来表明，预计下垂控制优于虚拟阻抗电流限制。
Sustainability and resilience concerns have motivated an unprecedented transformation of the electric power systems towards massive integration of renewable generation interfaced by power electronics. In this context, voltage source converters using grid-forming control are envisioned to provide services that so far have been provided by synchronous machines. In contrast to synchronous machines, voltage source converters are subject to stringent overcurrent limits. By exploiting the inherent time-scale separation between the inner control loops, the grid-forming reference dynamics (i.e., droop control, virtual oscillator control, etc and the transmission network, we highlight the well-known fact that the grid-forming reference dynamics need to be restricted to limit the converter output current without compromising stability. Next, we propose to formalize the problem of limiting the output current of a grid-forming converter by projecting the grid-forming reference dynamics onto a constraint on the output current. The main contribution is a projected droop controller that can be implemented using only local measurements. Moreover, we link the results to current limiting approaches using virtual impedance. Finally, we use a high-fidelity simulation to show that projected droop control outperforms virtual impedance current limiting.
影响因子：
7.7
作者：
Zhong, Qing-Chang;Weiss, George
通讯作者：
Weiss, George