Droop parallel power supply control method for train auxiliary inverter system

Abstract

The invention relates to a droop parallel power supply control method for a train auxiliary inverter system. The method comprises the following steps: 1), calculating the output active power and reactive power of each auxiliary inverter according to an equivalent simplified topology model of the train auxiliary inverter system; 2) adopting a resistive droop-based control method to obtain a given auxiliary inverter frequency and a reference voltage amplitude; 3) introducing self-adaptive virtual impedance to reduce the difference of system line impedance, and compensating voltage drop generated by introducing the self-adaptive virtual impedance; and 4) performing decoupling control on the voltage and current components by adopting a double closed-loop control method of a current inner loop and a voltage outer loop, generating a given reference voltage of SVPWM, generating a PWM control signal, and controlling the train auxiliary inverter to work normally. Compared with the prior art, the method has the advantages of voltage drop prevention, good applicability, stability, reliability and the like.

Description

Technical field [0001] The present invention relates to a power train control field, particularly to a parallel train droop auxiliary inverter system power supply control method based on an adaptive virtual impedance. Background technique [0002] Train auxiliary inverter parallel operation system to increase redundancy and reliability of power supply, without control of the parallel line interconnecting the auxiliary inverters are independent, no signal line is connected, as compared with a parallel supply lines interconnect system more simple, anti- capacity and better interference, parallel power supply is relatively excellent mode control method of controlling a train applied to the auxiliary inverter system enables the maintenance and expansion of the mounting system is more simple and convenient. [0003] Ideally case, each of the parallel system the auxiliary inverter parallel equivalent resistance of the output of the same, to ensure that droop parallel control of each in...

AI Technical Summary

Problems solved by technology

[0004] The virtual impedance technology currently used in the feedback control loop of the auxiliary inverter, because the value of the virtual impedance parameter must be large, it will cause a large voltage drop, which will lead to a drop in the output load voltage of the entire parallel system and the power supply of the auxiliary inverter system. decline in quality

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