Why Ideal Constant Power Loads Are Not the Worst Case Condition From a Control Standpoint
Why Ideal Constant Power Loads Are Not the Worst Case Condition From a Control Standpoint
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DOI：
10.1109/tsg.2014.2361630
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发表时间：
2015-07
影响因子：
9.6
通讯作者：
M. Cupelli;Lin Zhu;A. Monti
中科院分区：
文献类型：
--
作者：
M. Cupelli;Lin Zhu;A. Monti
本文研究了控制带宽对负载稳定性的影响，这些负载通过电力电子变换器连接，并由直流电源供电。当严格调节时，这些负载表现出恒定功率负载（CPL）行为。它在这里示出，理想的CPL假设，在文献中普遍存在，可能不代表在现实生活中的应用程序中的最坏情况。如果负载的控制带宽足够高，则负载表现得像CPL，并且系统稳定裕度随着输出功率的增加而减小。然而，在一个实际的范围内，与较低的控制带宽，系统的稳定裕度的关键影响的转换器的特性阻抗，以及其输出功率。在这些条件下，最小稳定裕度可能出现在低功率范围。
This paper investigates the influence of control bandwidth on the stability of loads, which are interfaced through power electronic converters and are fed from a dc power source. When tightly regulated, these loads exhibit a constant power load (CPL) behavior. It is shown here that the ideal CPL assumption, prevalent in literature, may not represent the worst case in real-life applications. If the control bandwidth of the load is sufficiently high, the load behaves like a CPL, and the system stability margin decreases with the increase in output power. However, in a practical range, with a lower control bandwidth, the system stability margin is influenced critically by the converter's characteristic impedance, as well as its output power. Under these conditions, the minimum stability margin may occur at a low-power range.