Abstract：This paper proposes a harmonic impedance measuring apparatus based on single phase cascaded H-bridge converters. The apparatus adopts the hierarchical control strategy to inject harmonic currents into traction power supply systems (TPSSs) with controllable frequencies and amplitudes. Power flow relationship between TPSSs and the apparatus is established. Working principle of the apparatus is clarified. The proposed control strategy is composed of three levels. The top power control level is employed to absorb active power and compensate the loss of this apparatus. The second harmonic control level is utilized to generate harmonic currents. The third voltage balancing control level is applied to balance the capacitor voltage of H-bridge converters. Theoretical analysis and simulations about the performance of this apparatus are carried out. Experiment results in laboratory scale confirmed that the apparatus can measure system harmonic impedance precisely.
刘秋降, 吴命利, 张俊骐, 吴丽然, 李静. 基于分层控制策略的牵引供电系统谐波阻抗测试装置[J]. 电工技术学报, 2018, 33(13): 3098-3108.
Liu Qiujiang, Wu Mingli, Zhang Junqi, Wu Liran, Li Jing. Harmonic Impedance Measuring Apparatus of Traction Power Supply System Based on Hierarchical Control Strategy. Transactions of China Electrotechnical Society, 2018, 33(13): 3098-3108.
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2018, Vol. 33 
