A method for monitoring the state of the busbar capacitance of the levitation chopper of the maglev train

Abstract

The invention discloses a method for monitoring the capacitance state of the bus bar of a levitation chopper of a maglev train. The method includes, step S100: obtaining the load current, capacitor voltage and capacitor ripple voltage of the bus bar of the levitation chopper of the maglev train; step S200: constructing and monitoring the levitation The neural network model of the capacitor state of the chopper bus; step S300: the load current, capacitor voltage and capacitor ripple voltage of the suspension chopper bus are used as the input of the neural network, and the eigenvalue of the suspension chopper bus capacitance is used as the neural network The output value is used to determine the state of the suspension chopper bus capacitance. It is possible to reliably monitor the state of the bus capacitance of the levitation chopper of the maglev train, so as to improve the safety performance of the maglev train.

Description

technical field [0001] The invention relates to the technical field of maglev trains, in particular to a method for monitoring the state of the capacitance of a bus bar of a levitation chopper of a maglev train. Background technique [0002] With the development of maglev trains, it is becoming more and more important to implement reliable capacitor condition monitoring of maglev train levitation chopper bus to ensure reliable field operation and preventive maintenance. Despite the great advancements in modern capacitor technology, it has been reported that capacitors are still one of the prominent components contributing to the field operational failure rate of power converters. If the capacitor reaches the end of its useful life, the power converter will fail. This usually leads to a converter check and analysis of the system. After a degraded capacitor is identified, maintenance can be performed to replace it. Even for capacitor banks with only a single degraded capaci...

AI Technical Summary

Problems solved by technology

This method of post-accident maintenance is simple but costly and unsafe because maintenance replacement is usually performed after converter abnormality or failure

However, the off-line capacitance monitoring technology needs to remove the capacitance from the circuit to test. Although this method has high precision, it is not practical.

The ripple current of the capacitor flows directly inside the capacitor, which is difficult to obtain directly, or an additional current sensor needs to be added to measure the ripple current of the capacitor

The newly added capacitance monitoring circuit will increase system complexity and hardware cost

In the process of capacitor aging, the capacitance value C (Capacitance) of the capacitor and the equivalent series resistance ESR (EquivalentSeries Resistance) of the capacitor will change significantly, but most capacitance monitoring methods cannot measure the capacitance value C and the equivalent series resistance of the capacitor at the same time. resistor ESR is monitored

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