Stability Criterion for Cascaded System With Constant Power Load

By W. Du, Junming Zhang, Yang Zhang, Z. Qian. IEEE transactions on power electronics, 2013

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Overview of Power Management Strategies of Hybrid AC/DC Microgrid (2015, background): “These problems have been studied in different researches using small-signal method and large signal methods [112], [113], and various solutions have been proposed to ensure the system stability.”
Modeling and Stability Analysis of Islanded DC Microgrids Under Droop Control (2015, methodology): “Such approach models the POL converters with a constant power characteristic to any operation voltage using the ideal CPL model, which assumes that the input power of a POL converter is constant and equal to the power demanded by the load [22]–[25].”
Constant power loads and their effects in DC distributed power systems: A review (2017, methodology): “The criterion of Mixed Potential Function is used to study the large-signal stability of dc source feeding CPL(s) with input LC filter in [37], and large-signal stability and to estimate ROA of cascaded dc power system in [38].”
Stability Issues of $Z + Z$ Type Cascade System in Hybrid Energy Storage System (HESS) (2014, background): “The problem of CPLs is that they show negative incremental resistance which may cause negative impedance instability in the system [43], [44].”