Control method and system of parallel connection of different auxiliary inverters, and auxiliary power supply system

Abstract

The invention relates to a control method and system of parallel connection of different auxiliary inverters, and an auxiliary power supply system. The control method comprises the steps of collectingthree-phase output voltage instantaneous values and three-phase output current instantaneous values of the auxiliary inverters; performing phase-locked loop calculation to obtain an output voltage amplitude feedback value Ud and an angle theta; carrying out power calculation to obtain active power P and reactive power Q; carrying out droop control on the active power P and the reactive power Q toobtain a voltage amplitude V and a frequency F, and generating a control angle phi according to the frequency F; carrying out PI calculation on a voltage amplitude feedback value Ud and a voltage amplitude V to obtain a voltage amplitude instruction value; comparing and calibrating the control angle phi and the angle theta, and carrying out inverse transformation on a voltage amplitude instruction value to obtain a voltage Ualpha and a voltage Ubeta; and modulating the voltage Ualpha and the voltage Ubeta to generate a modulated wave, and inputting the modulated wave into a switching tube ofan auxiliary inverter to enable the auxiliary inverter to generate a three-phase sinusoidal voltage. In the invention, parallel control of the auxiliary inverters with different structures and parameters can be realized.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and relates to an auxiliary inverter control technology, in particular to a method and system for parallel connection of auxiliary inverters with different topological structures and parameters, and an auxiliary power supply system. Background technique [0002] At present, the auxiliary inverters of subway vehicles all adopt the power supply mode of parallel operation to improve the reliability of the vehicle operation and prevent the normal operation of the vehicle from being affected by the shutdown of one auxiliary equipment. At the same time, this design can also reduce the design capacity of the inverter , reducing the difficulty of inverter design and selection. [0003] In the document "Analysis of Parallel Control Modes for Auxiliary Inverters of EMUs", there are many ways for auxiliary inverters to be connected in parallel. One way, but the auxiliary inverter equipment used for pa...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the existing control method cannot realize parallel control of two auxiliary inverters with different topological structures and parameters, the present invention provides a control method and system for parallel auxiliary inverters with different topological structures and parameters, Auxiliary power system, capable of parallel control of two auxiliary inverters with different structures and parameters

Images