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Power converter control method

A technology of a power converter and a control method, which is applied in the direction of output power conversion devices, intermediate conversion conversion equipment for direct current conversion, electrical components, etc., which can solve problems such as the increase of power supply current harmonics, and achieve reduction of AC components, The effect of reducing the burden

Active Publication Date: 2014-05-28
DAIKIN IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This harmonic component (the component opposite to the fundamental wave component of the voltage output from the inverter) causes an increase in the harmonics of the power supply current

Method used

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  • Power converter control method
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Experimental program
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Embodiment Construction

[0060] A. Structure of Direct Power Converter

[0061] figure 1 It is a circuit diagram showing the structure of the direct type power converter 9 to which the present invention is applicable. The direct power converter 9 has a converter 3, an inverter 4, and a pair of DC power supply lines L1, L2 connecting them.

[0062] The inverter 3 functions as a rectifier circuit and converts the three-phase (here, R-phase, S-phase, and T-phase) AC voltages Vr, Vs, and Vt (hereinafter also referred to as "first AC voltage") obtained from the AC power supply 1 . ) is rectified, and the rectified voltage Vdc is output to a pair of DC power lines L1 and L2.

[0063] The inverter 3 is, for example, a current-source rectifier, and operates under pulse width modulation. Inverter 3 has a plurality of current paths connected in parallel between DC power supply lines L1 and L2. Among the current paths of the inverter 3, the current path corresponding to R includes a pair of switching element...

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Abstract

The purpose of the invention is to, when outputting an AC voltage to an inductive load, reduce an effective power pulsation caused by odd-order harmonic components of the current flowing through the load. The modulation factor (k) of an inverter (4) has a DC component of k0 and AC components of k<6n>cos(6n*[omega]L*t+[phi]<6n>). The AC components have frequencies (6<[omega]L> / 2[pi]) which are 6n times the fundamental frequency (<[omega]L> / 2[pi]) of the AC voltages (Vu, Vv, Vw) output from the inverter (4). Even when the load currents (iu, iv, iw) include not only a fifth-order harmonic component but also a seventh-order harmonic component, it is possible to properly set the ratio between the magnitudes of the AC components and the DC component and reduce a power consumption pulsation caused by these high harmonic components. The reduction of this pulsation contributes to the suppression of power supply harmonics.

Description

technical field [0001] The present invention relates to techniques for reducing harmonics of load currents in so-called AC power converters. Background technique [0002] An example of a circuit that drives a polyphase AC load such as a motor is an inverter. With regard to this inverter, as a circuit system for achieving high efficiency and miniaturization, a structure (hereinafter referred to as a "smoothing circuit" using a matrix converter and a DC link without a smoothing circuit based on a large capacitor and / or reactor) is known. for "capacitorless inverter"). [0003] As for the matrix converter, there are a direct type matrix converter not provided with a DC link and an indirect type matrix converter provided with a DC link. But even for direct matrix converters, as introduced in Patent Document 3, a virtual AC-DC converter and a virtual DC-AC converter can be phased through a virtual DC link without a smoothing circuit. The actions of the combined resulting struc...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/48
CPCH02M5/4505H02M5/4585H02M1/12H02M5/42H02M5/22H02M5/297
Inventor 藤田崇之
Owner DAIKIN IND LTD