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An Assessment Method of Negative Sequences Aiming at the Continuous Co-Phase Traction Power Supply System | IEEE Conference Publication | IEEE Xplore

An Assessment Method of Negative Sequences Aiming at the Continuous Co-Phase Traction Power Supply System


Abstract:

The electrified railways are the largest single consumer of the power grid, in which the neutral sections between traction networks are always a major constraint to the s...Show More

Abstract:

The electrified railways are the largest single consumer of the power grid, in which the neutral sections between traction networks are always a major constraint to the stability and reliability of traction power supply system(TPSS). A continuous co-phase TPSS is an effective approach to achieve the goal that the electrical neutral sections between traction networks be eliminated. However, the negative sequences issues is very crucial in the systems, it is necessary to make an accurate assessment of the negative sequence to determine whether it needs to be managed. Therefore, a comprehensive and accurate mothod of negative sequence assessment has been proposed in this paper aiming at the continuous co-phase TPSS, without neglecting the traction calculation of the train, the coupling effects between the TPSS and the power grid. Firstly, the structure of the continuous co-phase TPSS is introduced, which is possible to realize the compensation of negative sequences to the power grid. The traction calculation of the train is accomplished so that the positions, speeds, and power of the trains at each moment can be obtained, which is the basis for the accurate calculation of the system's power flow. Next, the chain circuit model of the continuous co-phase TPSS is constructed to solve the power flow calculation(PFC) of the entire system. Finally, the method of negative sequence assessment is developed with the above analysis and then applied to the assessment of the negative sequences caused by an actual electrified railway to the power grid.
Date of Conference: 25-27 September 2024
Date Added to IEEE Xplore: 27 December 2024
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Conference Location: Beijing, China

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