Aircraft grid phase angle tracker based on nonlinear active disturbance rejection

Patent metadata

Field	Value
Publication number	US-11802895-B2
Application number	US-202117625307-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Feb 3, 2021
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

The present invention belongs to the technical field of aviation electrics and electric power, and provides an aircraft grid phase angle tracker based on nonlinear active disturbance rejection, which is used to estimate the grid phase angle on AC side of an aircraft grid. A embedded generator in the aircraft grid is arranged inside a compressor of an aviation gas turbine engine, and the embedded generator is directly coupled with the aviation gas turbine engine so that the AC frequency of the embedded generator varies with the speed of the aviation gas turbine engine. The present invention applies the nonlinear active disturbance rejection technology to the phase angle tracking of the more electric aircraft grid, is simple in operation and high in accuracy, and can realize high-accuracy tracking of the grid phase angle. The method has certain extensibility and can be extended to other fields.

First claim

The invention claimed is:

1. An aircraft grid phase angle tracker based on nonlinear active disturbance rejection, which is a grid synchronization module used to estimate the grid phase angle on AC side of an aircraft grid; a embedded generator in the aircraft grid is arranged inside a compressor of an aviation gas turbine engine, and the embedded generator is directly coupled with the aviation gas turbine engine so that the AC frequency of the embedded generator varies with the speed of the aviation gas turbine engine; therefore, a method for estimating a grid phase angle by the aircraft grid phase angle tracker based on nonlinear active disturbance rejection is designed, comprising the following steps:
step 1: firstly, defining a coordinate system, and converting AC V abc in a three-phase stationary rotating coordinate system to a two-phase stationary coordinate system ν αβ and finally to a two-phase rotating coordinate system ν qd ; and then controlling ν d =0 to estimate the grid phase angle, and describing conversion relationships between the coordinate systems with formula (1):

{

υ

α
⁢
β

=

T
s

·

V
abc

υ
qd

=

T
e

(

θ
^

)

·

υ

α
⁢
β

(
1
)

wherein

V
abc

=

[

V
a

V
b

V
c

]

T

,

υ

α
⁢
β

=

[

υ
α

υ
β

]

T

,

υ
qd

=

[

υ
q

υ
d

]

T

,

T
s

=

2
3

[

1

-

1
2

-

1
2

0

-

3

2

3

2

]

,

T
e

(

θ
^

)

=

[

Assignees

• Univ Dalian Tech

Inventors

• Sun Ximing
• Lin Ping

Classifications

• G01R25/005 Primary

  Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal · CPC title

• G01R25/00 Primary

  Arrangements for measuring phase angle between a voltage and a current or between voltages or currents · CPC title

• G01R29/16 Primary

  Measuring asymmetry of polyphase networks · CPC title

• G01R31/008

  on air- or spacecraft, railway rolling stock or sea-going vessels · CPC title