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
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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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