Voltage balance control method and device for three-phase dc-ac inverter

Patent metadata

Field	Value
Publication number	US-2019131884-A1
Application number	US-201816166373-A
Country	US
Kind code	A1
Filing date	Oct 22, 2018
Priority date	Oct 26, 2017
Publication date	May 2, 2019
Grant date	—

Abstract

A voltage balance control method applicable to a three-phase DC-AC inverter is provided, the voltage balance control method including: multiplying, by a first multiplier, an actual value of a line capacitance voltage by a sine function to generate a first voltage; capturing, by a first filter, a DC part of the first voltage to generate an error DC component; subtracting, by a first subtractor, the error DC component from a target voltage amplitude to generate a second voltage; adjusting, by a first proportional-integral controller, the second voltage to generate an amplitude error compensation value; and adding, by an adder, the amplitude error compensation value with the target voltage amplitude to generate an amplitude reference value. A voltage balance control device applicable to a three-phase DC-AC inverter is also provided.

First claim

1 . A voltage balance control method applicable to a three-phase DC-AC inverter, the voltage balance control method comprising:
multiplying, by a first multiplier, an actual value of a line capacitance voltage by a sine function to generate a first voltage; capturing, by a first filter, a DC part of the first voltage to generate an error DC component; subtracting, by a first subtractor, the error DC component from a target voltage amplitude to generate a second voltage; adjusting, by a first proportional-integral controller, the second voltage to generate an amplitude error compensation value; and adding, by an adder, the amplitude error compensation value with the target voltage amplitude to generate an amplitude reference value.

2 . The voltage balance control method of claim 1 , wherein the first voltage comprises the error DC component and a two-time angular frequency component.

3 . The voltage balance control method of claim 1 , further comprising multiplying, by a second multiplier, the actual value of the line capacitance voltage by a cosine function to generate a third voltage.

4 . The voltage balance control method of claim 3 , further comprising capturing, by a second filter, a phase part of the third voltage to generate a phase error component.

5 . The voltage balance control method of claim 4 , further comprising adjusting, by a second proportional-integral controller, the phase error component to generate a phase error compensation value.

6 . The voltage balance control method of claim 5 , further comprising subtracting, by a second subtractor, the phase error compensation value from a target voltage phase to generate a phase reference value.

7 . The voltage balance control method of claim 6 , further comprising receiving, by a sine wave generator, the phase reference value to generate a sine wave value.

8 . The voltage balance control method of claim 7 , further comprising multiplying, by a third multiplier, the amplitude reference value with the sine wave value to generate a control voltage reference value.

9 . A voltage balance control device applicable to a three-phase DC-AC inverter, the voltage balance control device being implemented by a chip or integrated in the chip, and comprising:
a reference value regulator configured for outputting a new reference value, wherein a feedback value is inputted to the reference value regulator; a subtracting device connected to an output end of the reference value regulator and configured for subtracting the feedback value from the new reference value; and a voltage regulator connected to the subtracting device.

10 . The voltage balance control device of claim 9 , wherein the reference value regulator comprises:
a first multiplier configured for outputting a first voltage, wherein the feedback value and a sine function are inputted to the first multiplier; a first filter connected to the first multiplier and configured for capturing a DC part of the first voltage and outputting an error DC component; a first subtractor connected to the first filter and configured for outputting a second voltage, wherein the first subtractor subtracts the error DC component from a target voltage amplitude; a first proportional-integral controller connected to the first subtractor and configured for outputting an amplitude error compensation value, wherein the first proportional-integral controller adjusts the second voltage; and an adder connected to the first proportional-integral controller and configured for outputting an amplitude reference value, wherein the adder adds the amplitude error compensation value to the target voltage amplitude.

11 . The voltage balance control device of claim 10 , wherein the reference value regulator comprises:
a second multiplier configured for outputting a third voltage, wherein the feedback value and a cosine function are inputted to the second multiplier; a second filter connected to the second multiplier and configured for capturing a phase part of the third voltage and outputting a phase error component; a second proportional-integral controller connected to the second filter and configured for outputting a phase error compensation value, wherein the second proportional-integral controller adjusts the phase error component; a second subtractor connected to the second proportional-integral controller and configured for outputting a phase reference value, wherein the second subtractor subtracts the phase error compensation value from a target voltage phase; and a sine wave generator connected to the second subtractor and configured for outputting a sine wave value, wherein the phase reference value is inputted to the sine wave generator.

12 . The voltage balance control device of claim 11 , wherein the reference value regulator comprises a third multiplier configured for outputting the new reference value, wherein the amplitude reference value and the sine wave value are inputted to the third multiplier.

Assignees

• Ind Tech Res Inst

Inventors

• Lin Meng-Yi
• Konishi Yoshihiro
• Yang zong-zhen

Classifications

• H02M7/1626

  with automatic control of the output voltage or current · CPC title

• H02M7/2173 Primary

  in a biphase or polyphase circuit arrangement (H02M7/2176 takes precedence; voltage multipliers H02M7/25) · CPC title

• H02M7/219 Primary

  in a bridge configuration · CPC title

• H02M7/53875

  with analogue control of three-phase output · CPC title

• H02M7/53871 Primary

  with automatic control of output voltage or current · CPC title