Method for rectifying three-phase active power factor

A source power and factor technology, which is applied in the conversion device of AC power input to DC power output, output power conversion device, energy industry, etc.

Inactive Publication Date: 2010-08-18
HOHAI UNIV CHANGZHOU
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  • Claims
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Problems solved by technology

Since the analog circuit control method is realized by using analog devices to build hardware circuits to form a control circuit, once the circuit is determined, the relevant parameters in the control system cannot be adjusted, and with the aging of the components in the control circuit, problems such as parameter drift will occur. , the control effect of the system will be affected by

Method used

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  • Method for rectifying three-phase active power factor
  • Method for rectifying three-phase active power factor
  • Method for rectifying three-phase active power factor

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Embodiment Construction

[0009] figure 1 The rectifier has 6 rectifier diodes (D 1 ~D 6 ) of the main circuit through three input PFC inductors (L a L b L c ) connected to the three-phase input power e a 、e b 、e c , three bidirectional power switches K a 、K b 、K c One end of the common point is connected to two output capacitors C 1 、C 2 The midpoint of the DSP control system inputs the PWM signal to control the three bidirectional power switches K in the main circuit after being driven by the drive circuit a 、K b 、K c .

[0010] Such as figure 1 , the circuit needs three bidirectional switches K a 、K b 、K c The duty cycle is controlled, and three bidirectional switches K can be obtained by analyzing the control model a 、K b 、k c The n+1th PWM duty cycle of Specific steps are as follows:

[0011] 1) Obtain the average value of the input current a > n and b > n ;

[0012] 2) According to the output voltage U dc The control parameter K obtained by PI adjustment U ; Calcula...

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Abstract

The invention discloses a three-phase active power factor rectification method for realizing the three-phase power factor correction and the three-phase input current harmonics reduction, which comprises the following steps: obtaining an input current average value of two-phase in the n-th PWM period; regulating the obtained control parameter via a PI based on the output voltage; calculating the equivalent rated load resistance on each phase AC side, the equivalent rated load resistance on each phase AC side in the rated power and the duty cycles of three bidirectional switches in the next PWM control period, finally outputting three bidirectional switch duty cycle control signals to control three corresponding bidirectional switches by a DSP control system at the beginning of the next PWM control period. The invention adopts a DSP (Digital Signal Processor) as the control core to realize the three-phase active power factor rectification without an input voltage sensor approaching to the unity power factor.

Description

technical field [0001] The invention is a method capable of realizing three-phase power factor correction and reducing three-phase input current harmonics, belonging to the technical field of electric engineering. Background technique [0002] At present, the general three-phase active power factor rectifier needs to detect the input AC voltage, and control the input current waveform by tracking the waveform of the input voltage, so as to improve the power factor and reduce the input current harmonics. This method first detects the three-phase input AC voltage signal, and uses this signal as a reference signal of the input current after conditioning, then detects the input current, and changes the PWM control of the power tube of the main circuit according to the difference between the input current and the reference signal to achieve an increase in input power. factor reduces the harmonics of the input current. This method needs to use three voltage sensors to detect the t...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 丁坤姚河清傅强史中权
Owner HOHAI UNIV CHANGZHOU
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