Stability Control of Railway Electric Traction Converters Based on Impedance Constraints
In the railway electric traction power supply system,dq impedance is the important parameters to measure system stability.If dq impedance cannot be controlled within a reasonable range,it will lead to unstable,inefficient or low-quality power transmission.Therefore,the automatic stability control technology of railway electric traction converter is proposed.Based on the energy conversion analysis results of the four quadrant converter,the impedance is measured,and the dq impedance measurement value of the converter is obtained.The Hilbert transform method is introduced to convert it into the response signal as the input signal of the adaptive active disturbance rejection proportional integral controller.The impedance threshold is established,and the dq impedance is controlled within the set threshold to control the low-frequency oscillation phenomenon.The results show that the proposed method has fast response speed and high suppression efficiency when dealing with low-frequency oscillation,and can realize the automatic control of the stability of railway electric traction converter.
railway electric tractionfour quadrant converterdq impedance measurementSAADR-PI controller
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