Research on Improved Control Strategy of Bidirectional Buck-Boost Converter Based on Posicast Control
Bidirectional Buck-Boost converters are widely used in energy storage systems such as lithium batteries.A voltage current dual loop control strategy is often adopted,which has disadvantages such as large dynamic overshoot and residual oscillation,affecting the normal operation of the energy storage sys-tem.An improved control strategy based on Posicast control is proposed.Firstly,the mathematical models of different working modes of bidirectional Buck-Boost converter are analyzed,the basic concept of Posicast controller is introduced,and the design method to enhance the robustness of Posicast is provided.Secondly,based on the dual loop control of the converter,the Posicast control algorithm is introduced into the current controller to improve the dynamic performance of the system.The design methods of each controller under different modes are given,and the robustness of the system when the inductance parameters change is ana-lyzed.Finally,the correctness of the proposed control strategy is verified through experiments on a proto-type platform of a bidirectional Buck-Boost converter with a power of 10 kW.
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维普
