Balance control method for voltage source type symmetric bipolar converters

A voltage source type, balanced control technology, applied in the direction of converting irreversible DC power input to AC power output, power transmission AC network, etc., can solve the problem of increased converter system loss, reduce system loss, avoid Harmful effect

Inactive Publication Date: 2014-09-24
XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the metal loop type system can run in an asymmetric state, the loss of the converter system increases

Method used

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  • Balance control method for voltage source type symmetric bipolar converters
  • Balance control method for voltage source type symmetric bipolar converters
  • Balance control method for voltage source type symmetric bipolar converters

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[0018] The present invention will be further described in detail below in conjunction with the drawings.

[0019] The present invention will take the earth loop type as an example to illustrate the balance control method. The basic idea of ​​the present invention is to achieve the goal of balanced operation of the symmetrical bipolar converter by controlling the neutral transmission line current to zero.

[0020] Such as figure 2 As shown, the prior art bipolar converter control structure includes: positive double closed-loop control and negative double closed-loop control. The positive control and the negative control are symmetrical: for the positive, the positive control includes the closed-loop control of the positive reactive power and the positive Active power closed-loop control constitutes the power outer loop, and the positive q-axis current closed-loop control, and the positive d-axis current closed-loop control constitutes the current inner loop. The output of the reactive

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Abstract

The invention relates to a balance control method for voltage source type symmetric bipolar converters, which controls an anode converter and a cathode converter respectively; neutral current closed-loop control, which takes zero neutral current as a control target and adopts a neutral current sampling value as feedback to perform PI control, is added; the output of the neutral current closed-loop control is used for overlapping commands of active power related control in anode and/or cathode control. The balance control method for the voltage source type symmetric bipolar converters provided by the invention presets a neutral current command to be zero through the balance control closed-loop, and achieves closed-loop control of the neutral current through PI control by making difference with the sampling value. The harm of ground loop operation is avoided; and as for a metal loop type system, by adopting the balance control method provided by the invention, converter system loss can be reduced.

Description

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Claims

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Application Information

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Owner XJ ELECTRIC
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