Abstract
Distributed energy resource (DER) has a wide operation range, fluctuating with particular working condition. To deal with the wide working range, non-inverting Buck-Boost Converter (NIBB) has been adopted for power conversion. It can work in Buck mode, Boost mode and Buck-Boost mode with flexible voltage conversion capability. At the same time, three mode operation of NIBB poses new challenge to existing modeling and control method. Each working mode has its' unique dynamic property. Conventional small-signal model fails to consider the multiple working modes. To describe converter dynamic property under three mode operation, NIBB is first modeled as linear-parameter-varying (LPV) system. Based on the LPV system, cascade control is synthesized through linear matrix inequity (LMI) approach. Influences of polytopic covering selection on NIBB control design is evaluated. The analysis results are validated by comparative simulations results.1
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