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A method and device for balancing capacitor voltage

A capacitor voltage and balancing capacitor technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problem of high cost, and achieve the effects of low cost, fast response speed and convenient calculation.

Active Publication Date: 2016-04-20
武汉武新电气科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiment of the present invention is to provide a method and device for balancing capacitor voltage to solve the problem of high cost in the prior art

Method used

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  • A method and device for balancing capacitor voltage
  • A method and device for balancing capacitor voltage
  • A method and device for balancing capacitor voltage

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Embodiment 1

[0024] Such as figure 1 Shown is a flowchart of a method for balancing capacitor voltages provided by an embodiment of the present invention, and the method includes the following steps:

[0025] In step S101, the average difference value of capacitor voltage in the circuit is obtained.

[0026] In the embodiment of the present invention, the calculation personnel obtain the upper voltage and lower voltage of the capacitor in the circuit through the detection equipment, filter the acquired upper voltage and lower voltage, record the filtered upper voltage and lower voltage, and obtain from the Sample the filtered upper voltage and lower voltage, calculate the average value of the samples, obtain the average upper voltage and the average lower voltage, and record the difference between the average upper voltage and the average lower voltage as the average capacitance voltage difference , where we record the average capacitor voltage difference as .

[0027] In step S102, th...

Embodiment 2

[0036] Such as Figure 4 Shown is the structural diagram of the balanced capacitor voltage device provided by the embodiment of the present invention. For the convenience of description, only the parts related to the embodiment of the present invention are shown, including:

[0037] The average difference acquisition unit 401 is configured to acquire the average difference of capacitor voltages in the circuit.

[0038] In the embodiment of the present invention, the average difference acquisition unit 401 acquires the upper voltage and lower voltage of the capacitor in the circuit, performs filtering processing on the acquired upper voltage and lower voltage, records the filtered upper voltage and lower voltage, and obtains Sample the above filtered upper voltage and lower voltage, calculate the average value of the samples, obtain the average upper voltage and the average lower voltage, and record the difference between the average upper voltage and the average lower voltage ...

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Abstract

The invention relates to the field of power, and provides a method and device for balancing capacitor voltages. The method includes the steps of obtaining an average difference value of the capacitor voltages in a circuit, obtaining a center point of PWM, obtaining a deviation value of the center point according to the average difference value of the capacitor voltages, and adjusting the position of the center point according to the deviation value of the center point so that the capacitor voltages can be balanced. According to the method and device, the average difference value of the voltages of an upper capacitor and a lower capacitor in the circuit and the center point of PWM are obtained, the deviation value of the center point is obtained according to the average difference value and the center point, and according to the deviation value, the position of the center point is adjusted so that the voltages of the upper capacitor and the lower capacitor can be balanced. By means of the method for adjusting the position of the center point, the response speed is high, adjustment precision is high, calculation is convenient to carry out through a controller of the circuit and cost is low.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a method and a device for balancing capacitor voltage. Background technique [0002] The main problem facing the power system distribution network today is how to provide users with safe, reliable, high-quality and economical power. With the development of modern industrial technology, power electronic devices are increasingly widely used in power systems, and the harm of harmonics is becoming more and more prominent. Therefore, how to suppress harmonics is particularly important to achieve the goal of appeal. [0003] The existing three-phase four-wire system active power filter uses four bridge arms with high cost. If the three-bridge arm capacitance splitting method is used to connect the neutral point of the capacitor to the neutral line, there will be a problem of unbalanced voltage between the upper and lower capacitors. If hysteresis control is used There is swit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 徐冲
Owner 武汉武新电气科技股份有限公司