Railway electric system phase constant difference control method and system

Abstract

The embodiment of the invention provides a railway electric system phase constant difference control method and system, which belong to the technical field of railway electric digital control and phase protection. The railway electric system phase constant difference control method comprises steps: a phase difference detection result is acquired, wherein the phase difference detection result is used for indicating the phase difference between a local power supply of the railway electric system and a rail power supply; and according to the phase difference, compensated reference current corresponding to the local power supply and the rail power supply is generated, and the generated compensated reference current is correspondingly outputted to the local power supply and the rail power supply. Thus, based on detection, feedback and control embedded protection, the problem of phase anomaly of the railway electric system can be effectively solved, and the local power supply and the rail power supply are ensured to be in a phase constant difference state.

Description

technical field [0001] The invention relates to the technical field of railway electrical digital control and phase protection, in particular to a method and system for controlling phase constant difference of a railway electrical system. Background technique [0002] In the railway electrical system, there is a requirement that the phase difference between the local voltage and the track power supply voltage is 90°, and the amplitude of the latter is twice that of the former. In addition, due to the existence of phase angle fluctuations, considering that the ABC three-phases on the grid may have a loose relationship of 120°, a system with a feedback link that generates multiple outputs with constant phase differences is required. [0003] At present, related technologies have proposed some measurement methods about constant phase difference, such as a resolver. Through the sine / cosine rotary transformer, the voltage conversion from the primary side to the secondary side ca...

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Problems solved by technology

[0004] However, the inventors of the present application found in the process of practicing the present application that since the current measurement method is based on analog circuits, the physical modules corresponding to different functions need to be interconnected, and this process will make the whole system reliable. Moreover, since it is necessary to add a protection circuit to the railway electrical system, when the phase difference is not equal to 90°, the external protection device can act to disconnect the analog phase shifter and provide bypass power to the subsequent load

In this way, under frequent external disturbances, the system will stop working for too long; at the same time, the realization of external protection depends on external devices, resulting in insufficient portability and insufficient stability of the entire system.

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