A voltage compensation circuit, method and air conditioning equipment for motor drive system

A motor drive system and voltage compensation technology, applied in the direction of AC network voltage adjustment, etc., can solve the problems of increasing load input current, large voltage sag amplitude on the grid side, etc., to improve stability, avoid excessive sag amplitude, maintain a stable effect

Active Publication Date: 2021-08-03
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a voltage compensation circuit to solve the problem in the prior art that the grid-side voltage sag is too large, resulting in an increase in the input current of the load

Method used

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  • A voltage compensation circuit, method and air conditioning equipment for motor drive system
  • A voltage compensation circuit, method and air conditioning equipment for motor drive system
  • A voltage compensation circuit, method and air conditioning equipment for motor drive system

Examples

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Embodiment 1

[0054] This embodiment provides a voltage compensation circuit for a motor drive system, as described above figure 1 As shown in , the motor drive system includes an AC power source AC, a rectifier circuit 2, a power factor correction closed-loop circuit PFC circuit 3, and a first inverter circuit 4, wherein the AC power source AC is connected to the input of the rectifier circuit 2 through a live line L and a neutral line N The AC terminal transmits the AC power to the rectifier circuit, the output terminal of the rectifier circuit 2 is connected to the PFC circuit 3, and the DC power formed after rectification is transmitted to the PFC circuit 3, and the PFC circuit 3 transmits the DC power to the first inverter circuit 4 through the DC bus for inversion. The first inverter circuit 4 transmits the AC power generated by the inverter to the motor. In practical applications, if a voltage sag occurs on the grid side, the PFC adjustment capability cannot form a closed-loop feedbac...

Embodiment 2

[0061] This embodiment provides another voltage compensation circuit for a motor drive system, image 3 is the internal structure diagram of the controller according to the embodiment of the present invention, in order to further realize the compensation voltage according to the sag amplitude and phase control of the grid-side voltage, such as image 3 As shown, the controller 11 includes: a detection module 111, which is used to obtain the sag amplitude and phase of the grid-side voltage, and is specifically used to: adopt the dq transformation method to obtain the sag amplitude and phase of the grid-side voltage; a calculation module 112 , for calculating the amplitude of the compensation voltage according to the sag amplitude of the grid-side voltage, and calculating the phase of the compensation voltage according to the phase of the grid-side voltage; the signal output module 113 is used for calculating the amplitude and Phase, outputting a control signal to control the co...

Embodiment 3

[0070] This embodiment provides an air conditioner, which includes a motor, and further includes the above-mentioned voltage compensation circuit for the motor drive system, which is used to maintain the stability of the input voltage and current of the motor in the air conditioner, and improve reliability and user experience.

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Abstract

The invention discloses a voltage compensation circuit, a method and an air conditioner for a motor drive system. Wherein, the voltage compensation circuit includes: a controller whose input end is connected between the AC power supply and the rectification circuit, and whose output end is connected to the second inverter circuit, for controlling the second inverter circuit according to the sag amplitude and phase The circuit outputs a corresponding compensation voltage; the filter circuit, its input end is connected to the second inverter circuit, and its output end is connected between the AC power supply and the rectification circuit, for compensating the output of the second inverter circuit The voltage is coupled between the AC power supply and the rectifier circuit; the energy storage unit, the output end of which is connected to the second inverter circuit, is used to provide power for the second inverter circuit. Through the present invention, the grid-side voltage can be compensated in real time, avoiding the problem that the amplitude of the grid-side voltage sag is too large, resulting in an increase in load input current, maintaining the stability of the load input voltage and current, and improving the stability of the equipment.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a voltage compensation circuit, method and air conditioner for a motor drive system. Background technique [0002] With the rapid development of modern technology, the load structure in different systems has undergone tremendous changes, and there are more and more accidents caused by power quality. Among the 11 major power quality problems summarized by the International Institute of Electrical and Electronics Engineers (IEEE), such as interruptions, voltage fluctuations, and frequency deviations, voltage sags are one of the most important causes of various accidents. [0003] figure 1 It is the structural diagram of the existing motor drive system. In the field of variable frequency drive of household air conditioner compressors, the DC power after the mains passes through the diode uncontrolled rectifier bridge can output a stable DC voltage through the power fact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12
CPCH02J3/12
Inventor 贺小林许烁刘文斌杨帆李洋梁喜芬李修贤
Owner GREE ELECTRIC APPLIANCES INC
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