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Converter control method and control device

A control method and technology of a control device are applied in the conversion device of output power, the conversion of AC power input into DC power output, the conversion of irreversible AC power input into DC power output, etc., so as to reduce the second harmonic and improve the power factor. Effect

Active Publication Date: 2015-10-21
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this control requires separate control of the current for each of the three phases

Method used

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  • Converter control method and control device
  • Converter control method and control device
  • Converter control method and control device

Examples

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Embodiment Construction

[0065] figure 1 It is a circuit diagram showing the three-level converter 200 and its peripheral structure to which the present invention is applied. Three-level converter 200 is connected to three-phase power supply 201 via reactor group 202 .

[0066] Three-phase voltages expressed as potentials Vu, Vv, and Vw are output from the three-phase power supply 201 , and three-phase currents Iu, Iv, and Iw flow into the reactor group 202 corresponding to the respective voltages. The three-level converter 200 receives currents Iu, Iv, and Iw, and generates input potentials Vr, Vs, and Vt corresponding to the respective currents.

[0067] The three-level converter 200 has a rectifier circuit 203 on the input side and capacitors 204 and 205 on the output side. The rectifier circuit 203 applies a high potential VH and an intermediate potential VQ to the capacitor 204 , and applies a low potential VL and an intermediate potential VQ to the capacitor 205 . Capacitors 204, 205 are equ...

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PUM

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Abstract

Controlled by switching is which reactor in a reactor group present between a power source and a three-level converter is to be connected to an intermediate point that outputs a midpoint potential. In the switching, the closer to the command value (0) of the midpoint potential the command values (Vr * , Vs * and Vt * ) of input potentials of the converter are, the greater the duty at which corresponding reactors are connected to the intermediate point is for pulse width modulation. Thus, the potential at the intermediate point is set to the command value of the midpoint potential. Additionally, a predetermined range to be compared with the command values (Vr * , Vs * and Vt * ) has a predetermined potential width with respect to an AC waveform (VK) centered around the command value (0) of the midpoint potential. This eliminates the need to detect the polarities of a power supply voltage and a current flowing through the converter for the pulse width modulation.

Description

technical field [0001] The invention relates to the technology of controlling the converter, in particular to the control technology of the three-level converter. Background technique [0002] A so-called three-level converter which obtains a three-level DC potential from a three-phase rectification circuit has been proposed. For example, three-level converters are exemplified in Patent Documents 1 to 3 and Non-Patent Documents 1 and 2 below. [0003] Figure 16 of Patent Document 1 Figure 4 The circuit diagram of the three-level converter presented in . Three-phase voltages are supplied to respective one ends of inductors 8, 9, 10 which are reactors in a set of three. The other ends of the inductors 8 , 9 , and 10 are connected to terminals 14 , 15 , and 16 via power supply lines 11 , 12 , and 13 , respectively. Terminals 14, 15, 16 function as input terminals of a power supply three-phase diode bridge 17 composed of diodes 18, 19, 20, 24, 25, 26, and the output side o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/06H02M7/10
CPCH02M7/2173H02M7/2176H02M7/487
Inventor 榊原宪一
Owner DAIKIN IND LTD