Detecting device and detecting method for detecting output impedance angle of inverter

Patent metadata

Field	Value
Publication number	US-9772360-B2
Application number	US-201615084492-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	May 26, 2015
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A detecting method for detecting an output impedance angle of an inverter includes controlling an inverter to output a second voltage signal and a current signal based on a first voltage signal; calculating an active power and reactive power based on the second voltage signal and the current signal; and calculating an output impedance angle of the inverter based on the product of the active power and a first amplitude parameter, the product of the active power and a second amplitude parameter, the product of the reactive power and the first amplitude parameter, and the product of the reactive power and the second amplitude parameter. The first amplitude parameter corresponds to a first amplitude of the first voltage signal, and the second amplitude parameter corresponds to the first amplitude of the first voltage signal and a second amplitude of an AC voltage.

First claim

What is claimed is:

1. A detecting method for detecting an output impedance angle of an inverter, comprising:
controlling an inverter to output a second voltage signal and a current signal based on a first voltage signal;
calculating an active power and a reactive power based on the second voltage signal and the current signal; and
calculating an output impedance angle of the inverter based on a product of the active power and a first amplitude parameter, a product of the active power and a second amplitude parameter, a product of the reactive power and the first amplitude parameter, and a product of the reactive power and the second amplitude parameter, wherein the first amplitude parameter corresponds to a first amplitude of the first voltage signal, and the second amplitude parameter corresponds to the first amplitude of the first voltage signal and a second amplitude of an AC voltage.

2. The detecting method of claim 1 , wherein a step of calculating the output impedance angle of the inverter comprises:
calculating the output impedance angle of the inverter based on a formula as follows:

θ
=

arctan
⁢

P
*
A

+

Q
*
B

P
*
B

-

Q
*
A

,

wherein θ is the output impedance angle, P is the active power, Q is the reactive power, A is the first amplitude parameter, and B is the second amplitude parameter.

3. The detecting method of claim 2 , wherein the first amplitude parameter is obtained by a formula as follows:
A=U c sin δ,

wherein U c is the first amplitude of the first voltage signal, and δ is a power angle of the first voltage signal;
wherein the second amplitude parameter is obtained by a formula as follows:
B=U c cos δ− U o ,

where U 0 is the second amplitude of the AC voltage.

4. The detecting method of claim 3 , further comprising:
setting the first amplitude and the power angle of the first voltage signal.

5. The detecting method of claim 3 , further comprising:
setting an active power signal and a reactive power signal; and
generating the first amplitude and the power angle of the first voltage signal based on the active power signal and the reactive power signal.

6. A detecting method for detecting an output impedance angle of an inverter, comprising:
controlling an inverter to output a second voltage signal and a current signal based on a first voltage signal, wherein the first voltage signal comprises a first amplitude and a power angle, a value of one of the first amplitude and the power angle is variable, and a value of the other one of the first amplitude and the power angle is constant;
calculating a first active power, a second active power, a first reactive power, and a second reactive power based on the second voltage signal and the current signal; and
calculating an output impedance angle of the inverter based on a product of the first active power and a first amplitude parameter, a product of the first active power and a second amplitude parameter, a product of the second active power and the first amplitude parameter, and a product of the second active power and the second amplitude parameter, or calculating the output impedance angle of the inverter based on a product of the first reactive power and the first amplitude parameter, a product of the first reactive power and the second amplitude parameter, a product of the second reactive power and the first amplitude parameter, and a product of the second reactive power and the second amplitude parameter, wherein the first amplitude parameter corresponds to the first amplitude of the first voltage signal, and the second amplitude parameter corresponds to the first amplitude of the first voltage signal and a second amplitude of an AC voltage.

7. The detecting method of claim 6 , wherein the first amplitude is a constant value, and the power angle changes from a first power angle to a second power angle, wherein a step of calculating the output impedance angle of the inverter comprises:
calculating the output impedance angle of the inverter based on one of formulas as follows:

θ
=

arctan
⁢

P
2

*

B
1

-

P
1

*

B
2

P
1

*

A
2

-

P
2

*

A
1

,
or
,

θ
=

arctan
⁢

Q
1

*

A
2

-

Q
2

*

A
1

Q
1

*

B
2

-

Assignees

• Delta Electronics Inc

Inventors

• Zhou jian-hong
• Lu Cheng
• Zhang Jia-Min
• Wu Hong-Yang

Classifications

• H02M7/5387 Primary

  in a bridge configuration · CPC title

• G01R27/06

  Measuring reflection coefficients; Measuring standing-wave ratio · CPC title

• G01R27/26 Primary

  Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants {; Measuring impedance or related variables} · CPC title

• G01R27/28

  Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response (in line transmission systems H04B3/46) · CPC title

• G01R31/3183

  Generation of test inputs, e.g. test vectors, patterns or sequences · CPC title