Method for keeping intermediate direct-current voltage of regeneration passing neutral section stable

Abstract

The invention discloses a method for keeping intermediate direct-current voltage of regeneration passing neutral section of an alternating-current transmission system stable. The alternating-current transmission system enters a phase separation region, a control system receives an entering phase separation anticipating signal and switches a traction motor into a regeneration state, regeneration torque of the traction motor is obtained according to difference of an intermediate direct-current voltage reference value and an actual value via a PI (proportion integration) controller, and parameters of the PI controller need to be adjusted according to an actual system. By the aid of the method, the alternating-current transmission system dynamically adjusts the regeneration torque of the traction motor according to needs of an auxiliary power supply system in a regeneration passing neutral section period, balance of input power and output power in an intermediate direct-current link is realized, extreme fluctuations of the intermediate direct-current voltage are avoided, and performances of the total system are improved.

Description

technical field [0001] The invention relates to the control of electric locomotives or EMUs with AC transmission, in particular to the retrieval field of electric locomotives or EMUs using AC transmission systems for regeneration over-current phase-separated control. Background technique [0002] There are many methods for electric locomotive (EMU) over-voltage phase separation. In the early days, the speed of trains was relatively slow, and manual over-power phase separation was usually used. There was a phase-separation sign in the phase-separation area to instruct the driver to operate over-power phase separation. Before reaching the neutral section, the driver first reduces the traction level to 0, disconnects the auxiliary system, and then disconnects the main circuit breaker on the primary side of the traction transformer, so that the locomotive passes through the neutral section without electricity. After the locomotive enters the power supply area of ​​the power supp...

AI Technical Summary

Problems solved by technology

Due to the mechanical loss, copper loss, iron loss, switching device loss, diode conduction loss, etc. in the process of converting the kinetic energy of the train into electrical energy by the traction motor, there is a discharge resistance in the intermediate DC link, and the speed changes during the phase separation of the train , and more importantly, the energy required by the auxiliary power supply system is also dynamically changing. These reasons make it a difficult problem to maintain the stability of the intermediate DC voltage during the phase separation of regenerative overpower

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