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Charge/discharge circuit, control method for charge/discharge circuit, control device for charge/discharge circuit, and direct power converter

A charge-discharge circuit and power converter technology, applied in the direction of irreversible DC power input conversion to AC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problem of not having a booster circuit and capacitors, etc.

Active Publication Date: 2017-09-08
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent Document 2 also discloses a direct type power converter, but the above-mentioned boost circuit and capacitor are not provided

Method used

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  • Charge/discharge circuit, control method for charge/discharge circuit, control device for charge/discharge circuit, and direct power converter
  • Charge/discharge circuit, control method for charge/discharge circuit, control device for charge/discharge circuit, and direct power converter
  • Charge/discharge circuit, control method for charge/discharge circuit, control device for charge/discharge circuit, and direct power converter

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Embodiment Construction

[0048] A. The structure of the direct type power conversion device:

[0049] Before specifically describing the characteristic technology of the embodiment, the configuration of a direct power conversion device to which this technology is applied will be described. In addition, the basic operation of this structure itself is already known in Patent Document 1, so details thereof are omitted here.

[0050] Such as figure 1 As shown, the direct power conversion device has a diode rectifier 2 , an LC filter 3 , a charging and discharging circuit 4 and an inverter 5 . DC power supply lines LH, LL function as a DC link between inverter 5 and charge / discharge circuit 4 . A higher potential than that of the DC power supply line LL is applied to the DC power supply line LH.

[0051] The diode rectifier 2 has an input side and an output side to which a single-phase AC voltage Vin is applied from the single-phase AC power supply 1 .

[0052] The diode rectifier 2 performs single-pha...

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Abstract

In the present invention, even if the resonance of an LC filter is suppressed using suppression current, the sampling of a control system for controlling an inverter, and the update of a command value are not impaired. In a block 10a, a current distribution-factor generating unit 11 inputs the following: amplitude Vm of single phase AC voltage Vin; amplitude Im of input current; a command value Idc* for DC current Idc; a command value Vc* for end-to-end voltage Vc; and power source angular velocity omega. The current distribution factor generating unit 11 outputs a current command value Ib*. A resonance suppression control unit 15 inputs a reactor voltage VL and outputs a correction value kVL. A subtractor 17 subtracts the correction value kVL from the current command value Ib* and applies the result to a chopper control unit 16. The chopper control unit 16 outputs a boost duty dl on the basis of the corrected current command value (lb* kVL). The boost duty dl is compared to a carrier C2 in a comparator 14, and the result thereof is output as a control signal SSl.

Description

technical field [0001] The present invention relates to a charge-discharge circuit included in a direct-type power converter, a control method for the charge-discharge circuit, a control device for the charge-discharge circuit, and the direct-type power converter. Background technique [0002] Patent Documents 1, 3, and 4 disclose direct power converters. The direct type power converters disclosed in these patent documents include a boost circuit and a capacitor supporting a voltage boosted by the boosted voltage. Among the direct current power supplied to the inverter, the electric power from the capacitor and the electric power obtained from the diode rectifier are appropriately processed, thereby increasing the direct current voltage input to the inverter. [0003] Patent Document 2 also discloses a direct type power converter, but does not include the above-mentioned booster circuit and capacitor. On the other hand, an LC filter for suppressing the carrier current of t...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M3/155H02M7/48
CPCH02M1/12H02M1/4225H02M5/458H02M1/126H02M7/53871H02M7/5395H02M1/15Y02B70/10H02M1/0025H02M1/0009H02M1/007H02M1/4266H02M1/08
Inventor 山下尚也
Owner DAIKIN IND LTD