Train ground automatic neutral section passing method and system, terminal equipment and storage medium

Abstract

The invention discloses a train ground automatic neutral section passing method and system, terminal equipment and a storage medium. The method comprises the steps: obtaining a train operation position, and determining a power supply for supplying power to a train according to the operation position; specifically, when the train is located in a transition region, according to the voltage and current of the transition region and the parameters of a quadruple auxiliary converter device, determining an output voltage decoupling modulation signal of the quadruple auxiliary converter device in the transition region and an output voltage modulation signal of the power supply arm corresponding to the transition region; and when the train is located in the electrical isolation region, pre-modulating the voltage amplitude and phase of the quadruple auxiliary converter device by taking the voltage of the power supply arm B as a target. According to the invention, over-voltage and over-current impact influences of pantograph-catenary arcs on a vehicle-catenary system can be avoided; flexible voltage switching between adjacent power supply arms can be realized, and short circuit and transient impact influences caused by direct voltage switching can be effectively avoided and suppressed; and in addition, the rated operation condition of the train is guaranteed through alternate transfer of the power, and the speed loss of the train is reduced.

Description

technical field [0001] The invention belongs to the technical field of traction power supply for electrified railways, and in particular relates to a method, a system, a terminal device and a computer-readable storage medium for automatic phase separation on the ground of a train. Background technique [0002] Based on the single-phase power supply characteristics of electrified railways, the traction load usually has the characteristics of single-phase, random and nonlinear. Therefore, the three-phase load unbalance problem of the power system is usually solved by using the traction transformer to realize the 3 / 2 system conversion and supplying power to the traction network in sections. However, as the weak link of the traction power supply system, the electrical isolation section (namely, the electrical separation phase area) set up to prevent phase-to-phase short circuit has caused many potential safety hazards. On the one hand, when the train runs in excessive phases, i...

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Problems solved by technology

For example, "Research on Flexible Ground Automatic Neutral-section Passing Technology Base on Voltage Compensation" and "Simulation of Flexible Automatic Neutral Section Passing System Based on RTDS" based on DPC and voltage phase modulation technology have carried out meaningful exploration on the method of over-phase separation on the ground of trains, but Single topology circuits have the limitation of insufficient output drive capability

In order to adapt to the background of large-capacity practical engineering applications, "Virtual co-phase traction power supply system adopting the cascaded H-bridge multilevel converter" adopts the cascaded H-bridge converter to directly drive the load, and at the same time adopts the modulation method of the nearest level approximation to The smooth switching of the output voltage is realized, but the problem of high cost caused by too high number of cascaded modules and the accumulated error generated by the integral algorithm limit the practical engineering application prospect of this method

In order to overcome the structurally complex defects of Modular multilevel converter (MMC), "Transformerless powerrouter used as load balancer and uninterruptible power supply for auto-passing neutral section" proposes a high-voltage four-level converter based on series-connected IGBTs Bridge arm converter topology, this type of power conditioner (Railway power conditioner, RPC) does not contain a matching transformer, thereby reducing the specification of the device by 30%, but this method still generates several cycles of transient state during circuit switching shock current

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