Title :
Why ideal constant power loads are not the worst case condition from a control standpoint
Author :
Marco Cupelli; Lin Zhu;Antonello Monti
Author_Institution :
E.ON Energy Res. Center, RWTH Aachen Univ., Aachen, Germany
fDate :
7/1/2015 12:00:00 AM
Abstract :
Summary form only given. 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.
Keywords :
"Power system stability","Bandwidth","Power generation","Power electronics","Control systems","Impedance"
Conference_Titel :
Power & Energy Society General Meeting, 2015 IEEE
DOI :
10.1109/PESGM.2015.7285930