Vector control of grid-connected power electronic converter using artificial neural networks

摘要

Systems and methods for performing vector control of grid-connected power electronic converters using a neural network are described herein. Optionally, the grid-connected power electronic converters can be used in renewable and electric power system applications. In order to improve performance and stability under disturbance conditions, integrals of error signals can be introduced as inputs to the neural network. Alternatively or additionally, grid disturbance voltage can be introduced to an output of a trained neural network.

主权项

1. A method for controlling a grid-connected energy source or energy system, comprising:
providing a grid-connected pulse-width modulated (“PWM”) converter operably connected between an electrical grid and an energy source; providing a control system operably connected to the grid-connected PWM converter, the control system comprising a nested-loop controller and an action neural network, wherein a d-axis loop of the nested-loop controller controls real power and a q-axis loop of the nested-loop controller controls reactive power; receiving a plurality of inputs at the action neural network, wherein the plurality of inputs comprise:
a d-axis current, id,a q-axis current, iq,a d-axis error signal, wherein the d-axis error signal comprises a difference between id and a reference d-axis current, id*,a q-axis error signal, wherein the q-axis error signal comprises a difference between iq and a reference q-axis current, iq*,an integral of the d-axis error signal, andan integral of the q-axis error signal; outputting a compensating dq-control voltage from the action neural network, wherein the action neural network is configured to optimize the compensating dq-control voltage based on the plurality of inputs; and receiving the compensating dq-control voltage in the nested-loop controller, wherein the control system is configured to control the grid-connected PWM converter using the compensating dq-control voltage.