Frequency Adaption Control Strategy for the Power Electronic Traction Transformer

Yu Ai, Jianqiang Liu, Jingxi Yang, T. Zheng
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引用次数: 1

Abstract

In this paper, a frequency adaption control strategy for the power electronic traction transformer (PETT) is proposed, where the real-time value of the grid frequency can be estimated by the frequency-locked-loop (FLL), then the center frequencies of the resonant regulators in the current inner loop and the second-order generalized integrators in the phase-locked-loop (PLL) can be adaptive regulated. In order to suppress the dc offset brought in by the sampling process, the dc-offset rejecters are respectively designed and embedded in the current-inner-loop controller and PLL. The discretization form of the proposed control strategy is also derived, by which the corresponding difference equations can be acquired and applied in the digital control chips conveniently. Finally, the effectiveness of the proposed control strategy is verified by the simulation and experiment results.
电力电子牵引变压器频率自适应控制策略
提出了一种电力电子牵引变压器(PETT)的频率自适应控制策略,该策略通过锁频环(FLL)估计电网频率的实时值,然后自适应调节电流内环谐振稳压器的中心频率和锁相环(PLL)中的二阶广义积分器的中心频率。为了抑制采样过程带来的直流偏置,分别设计了直流偏置抑制器,并将其嵌入到电流内环控制器和锁相环中。推导了所提出的控制策略的离散化形式,可以方便地获得相应的差分方程并应用于数字控制芯片。最后,通过仿真和实验结果验证了所提控制策略的有效性。
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