Research on Bi-level Model Predictive Control for the Receiving-Side Interleaved DC-DC Converter of Dynamic Wireless Power Transfer System
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动态无线电能传输(dynamic wireless power transfer,DWPT)系统接收侧交错并联DC-DC变换器控制是一个复杂的非线性系统.针对其计算量大使系统控制性能变差的问题,提出了一种双层模型预测控制(bi-level model predic-tive control,BMPC)控制策略来提高系统控制性能.首先对DWPT系统结构和原理进行分析,得到DWPT系统动态过程磁耦合线圈互感变化曲线和控制变量;然后建立交错并联DC-DC变换器线性状态空间模型,将该模型进行解耦,设计以DWPT系统输出功率提高为目标的上层MPC和以交错并联DC-DC变换器多路输出均流为目标的下层MPC,并给出目标函数;最后搭建基于BMPC的三相交错并联Buck变换器仿真模型与实验平台,仿真与实验验证了所提出控制策略的可行性与优越性.
The control of the interleaved parallel DC-DC converter on the receiving side of the Dynamic Wireless Power Trans-fer(DWPT)system is a complex nonlinear system.A two-layer model predictive control strategy is proposed to improve the sys-tem control performance by addressing the problem of reduced system control performance due to the high computational com-plexity.Firstly,the structure and principle of the DWPT system are analyzed,and the mutual inductance variation curve and con-trol variables of the magnetic coupling coils of the dynamic process are obtained.Then,the linear state space model of the inter-leaved parallel DC-DC converter is established and decoupled.The upper layer MPC aiming at increasing the output power of the DWPT system and the lower layer MPC aiming at the equal multiple output currents of the interleaved parallel DC-DC converter are designed.The objective function is given.Finally,a simulation model and experimental platform of a three-phase interleaved Buck converter based on BMPC are constructed,and simulation and experiments validate the feasibility and superiority of the pro-posed control strategy.
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