The accurate analysis of broadband oscillations in electrified railways requires a comprehensive understanding of the broadband impedance characteristics of four-quadrant converters (4QCs) in trains. However, the refined mathematical modeling and rapid measurement methods for broadband impedance remain unclear due to frequency-coupling interference in the control system of 4QC. To address this issue, a multifrequency impedance model is proposed to analyze broadband oscillation issues across different frequency bands. Simplified expressions are derived for low and high frequencies to streamline the analysis. The unified model enables the examination of frequency-coupling effects and guides the design of broadband impedance measurements. Furthermore, a rapid impedance measurement method for 4QC is proposed by designing the frequency distribution and injection sequence of the broadband signal. Through comparison, the proposed method achieves accurate measurement of broadband impedance for 4QC with high testing speed while mitigating the influence of network-side impedance on the measurement results. The hardware-in-the-loop (HIL) results demonstrate a strong correlation between the measured broadband impedance and theoretical calculations. Moreover, the HIL test results for unstable cases align with the theoretical analysis. These results validate the effectiveness of the proposed measurement method.
Detailed Modeling and Rapid Measurement Approach for Broadband Impedance of High-Speed Train
IEEE Transactions on Transportation Electrification ; 10 , 2 ; 3630-3644
2024-06-01
4250604 byte
Article (Journal)
Electronic Resource
English
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