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研究了列车制动能量回馈电网的原理、功率拓扑结构、数学模型和控制算法。通过理论分析,采用Matlab仿真工具,建立了采用电流滞环SPWM控制的三电平拓扑实现列车制动能量回馈电网的数学模型和仿真模型。列车制动能量回馈电网的仿真试验表明,该系统不仅可使能量双向流动,且能有效抑制注入电网的谐波,其电能质量指标能符合相关并网标准,可考虑并网消纳回馈功率。
The principle, power topology, mathematical model and control algorithm of train braking energy feedback grid are studied. Through theoretical analysis and Matlab simulation tool, the mathematical model and simulation model of train brake energy feedback grid with three-level topology controlled by current hysteresis loop SPWM are established. The simulation of train brake energy feedback grid shows that the system can not only make the energy flow in both directions, but also can effectively suppress the harmonic injected into the power grid. The power quality index of the train can meet the relevant grid-connected standards and can consider the grid-connected cancellation of the feedback power.