Abstract
Rapidly growing distributed renewable networks make an increasing demand for various types of power converters to feed different loads. Power converters with constant power load (CPL) are one typical configuration that can degrade the stability of the power conversion system due to the negative impedance characteristic. This article presents a nonlinear analysis method using the developed complete-cycle solution matrix method by transforming the original linear time-variant system into a summation of segmented linear time-invariant systems. Thus, the stability of the nonlinear system can be studied using a series of the corresponding state transition matrix and saltation matrix. As this derived matrix contains all the comprehensive information relating to the system’s stability, the influence of the CPL to system’s fast-timescale stability in both continuous conduction mode and the discontinuous conduction mode can be fully investigated and analyzed. The phenomena of the fast-timescale instability around switching frequency for power converters with a CPL are observed and investigated numerically. Finally, experimental results have proven the analysis and verified the effectiveness of the developed method.
Highlights
Facing the rapid exhaustion of fossil fuel and environmental deterioration, renewable power distribution systems based on power electronics converters are becoming increasingly common
To investigate such fast timescale instability issues of power DC-DC converters, a nonlinear analysis technique based on the Monodromy matrix has been developed and applied in the bidirectional and interleaved boost converters with a resistive load [30, 31] whereas this method cannot be directly applied to constant power load (CPL) due to the inherent characteristics of linear time-variant in CPL
Power boost converters with CPL are identified as an linear time-variant (LTV) system, which cannot be studied by the classical stability analysis approaches for linear time-invariant (LTI) system
Summary
Facing the rapid exhaustion of fossil fuel and environmental deterioration, renewable power distribution systems based on power electronics converters are becoming increasingly common. A circular switching surface technique is proposed to mitigate the instability created by CPLs in electric vehicle systems where tight-speed controllers in the vehicle’s traction system and tightly regulated dc–dc converters produces the constant power behavior [8] Both small-signal and large-signal stability criteria have been derived for the analysis of such hybrid power system with a CPL using Jacobian matrix [29]. SiC and GaN downstream power converters will only accelerate this problem due to their superb high-switching frequency capabilities, which make the need of the presented work even more important To investigate such fast timescale instability issues of power DC-DC converters, a nonlinear analysis technique based on the Monodromy matrix has been developed and applied in the bidirectional and interleaved boost converters with a resistive load [30, 31] whereas this method cannot be directly applied to CPL due to the inherent characteristics of linear time-variant in CPL.
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