System and method for controlling a converter circuit

Patent metadata

Field	Value
Publication number	US-9935462-B2
Application number	US-201615007486-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Jan 27, 2016
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

A method for controlling an operation of a converter circuit adapted to regulate power transfer between a first voltage source and a second voltage source includes detecting a first voltage level of the first voltage source and a second voltage level of the second voltage source; calculating a power value based on the detected first voltage level and the detected second voltage level; comparing the calculated power value with a reference power value; and determining switching time of one or more switches in the converter circuit based on a compared result so as to regulate power transfer between the first voltage source and the second voltage source.

First claim

The invention claimed is:

1. A method for controlling an operation of a converter circuit adapted to regulate power transfer between a first voltage source and a second voltage source, the method comprising the steps of:
detecting a first voltage level of the first voltage source and a second voltage level of the second voltage source;
calculating a power value based on the detected first voltage level and the detected second voltage level;
comparing the calculated power value with a reference power value; and
determining switching time of one or more switches in the converter circuit based on a compared result so as to regulate power transfer between the first voltage source and the second voltage source;
wherein the power value is calculated according to:

P
*

=

P

ma
⁢

⁢
x

·

V
L
2

V
L
4

-

V

Lma
⁢

⁢
x

4

+

V
Lmax
2

⁢

V
Hmin
2

where P* is the power value to be calculated, P max is an upper limit of the power value, V L is the detected second voltage level, V Lmax is an upper limit of the second voltage level, and V Hmin is a lower limit of the first voltage level.

2. The method in accordance with claim 1 , further comprising the step of:
generating gating signals to be provided to the one or more switches based on the determined switching time.

3. The method in accordance with claim 2 , further comprising the step of:
providing the gating signals to the one or more switches so as to control switching on and off thereof.

4. The method in accordance with claim 1 , further comprising the step of: controlling the one or more switches to have a substantially identical switching period.

5. The method in accordance with claim 1 , wherein the step of detecting the first voltage level and the second voltage level comprises:
sampling the first voltage level; and
sampling the second voltage level.

6. The method in accordance with claim 1 , wherein the converter circuit comprises:
a first switching circuit in the form of a bridge circuit, the first switching circuit having a first pair of switches and a second pair of switches connected in parallel with each other;
a second switching circuit in the form of a bridge circuit, the second switching circuit having a third pair of switches and a fourth pair of switches connected in parallel with each other; and
an inductive component coupling the first switching circuit with the second switching circuit;
and wherein the method comprises:
controlling the first pair of switches, the second pair of switches, the third pair of switches, the fourth pair of switches so that they all have a substantially identical switching period.

7. The method in accordance with claim 6 , wherein the step of determining switching time comprises:
determining a first duration from a switch-on time of one of the second pair of switches to a switch-on time of one of the first pair of switches; and
determining a second duration between the switch-on time of the one of the first pair of switches and a switch-on time of one of the fourth pair of switches.

8. The method in accordance with claim 7 , wherein if the calculated power value is smaller than the reference power value, the first duration and the second duration are determined by:

T

d
⁢

⁢
1

=

1
π

⁢

T
p

⁢

cos

-
1

[

P
com

⁡

(

V
L
4

-

V
Lmax
4

+

V
Lmax
2

⁢

V
Hmin
2

)

P

ma
⁢

⁢
x

·

V
L

V
H

]

T

d
⁢

Assignees

• Univ Macau Sci & Tech

Inventors

• Li Xiaodong

Classifications

• H02J3/381

  Dispersed generators · CPC title

• H02M3/33584

  Bidirectional converters · CPC title

• H02J7/34

  Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J3/38 Primary

  Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel · CPC title