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Power Converter Control Method

A technology of a power converter and a control method, which is applied to output power conversion devices, electrical components, and conversion equipment that can be converted to direct current without intermediate conversion, and can solve problems such as the increase in harmonics of power supply current and reduce AC power. Components, burden reduction effect

Active Publication Date: 2017-02-22
DAIKIN IND LTD
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  • Summary
  • 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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Examples

Experimental program
Comparison scheme
Effect test

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 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 elements S...

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Abstract

When an AC voltage is outputted to an inductive load, pulsation of an effective power caused by an odd number-th order harmonic component of a current flowing in this load is reduced. A modulation factor k of an inverter 4 includes a DC component k 0 and an AC component k 6n cos(6n·É L ·t + Õ 6n ). The AC component includes a frequency (6É L / 2À) which is a 6n multiple of the fundamental frequency (É L / 2À) of AC voltages Vu, Vu and Vw outputted from the inverter 4. Even when there are not only the 5th order harmonic component of load currents iu, iv and iw but also the 7th order harmonic component, it is possible to adequately set the ratio of the magnitude of the AC component and the ratio of the DC component and reduce pulsation of consumption power caused by these harmonic components. Reducing the pulsation contributes to suppression of power 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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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02M7/48
CPCH02M1/12H02M5/22H02M5/297H02M5/4505H02M5/4585
Inventor 藤田崇之
Owner DAIKIN IND LTD