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Electric power conversion device and adjusting method thereof

A power conversion device, power conversion technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve problems such as power conversion circuit failures, and achieve the effect of reducing reactors

Active Publication Date: 2019-03-22
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is a problem that, among a plurality of power conversion circuits connected in parallel, if there is a deviation in the output current of each power conversion circuit, the current duty (original text: current duty) is concentrated on a part of the power conversion circuits, resulting in power conversion failure. circuit malfunction

Method used

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  • Electric power conversion device and adjusting method thereof
  • Electric power conversion device and adjusting method thereof
  • Electric power conversion device and adjusting method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0065] use Figure 1~4 Embodiment 1 will be described.

[0066] figure 1 The overall configuration of the power conversion device according to Embodiment 1 of the present invention is shown.

[0067] Such as figure 1 As shown, in the power conversion device according to Embodiment 1, a plurality of ( figure 1 The middle is two) the power conversion circuit 100 responsible for the main power conversion function of the power conversion device. The power conversion circuit 100 has two branches composed of IGBTs 102uu, 102ud, 102vu, and 102vd (hereinafter, collectively referred to as "IGBT102" as appropriate) and diodes 103uu, 103ud, 103vu, and 103vd (hereinafter, collectively referred to as "diode 103" as appropriate). road. Each branch has two arms connecting IGBT 102 and diode 103 in antiparallel. In this manner, the power conversion circuit 100 includes a main circuit of a single-phase inverter. In addition, the diode 103 operates as a freewheeling diode.

[0068]The e...

Embodiment approach 2

[0103] use Figure 5 as well as Image 6 Embodiment 2 will be described. In addition, differences from Embodiment 1 will be mainly described.

[0104] Figure 5 The overall structure of the power conversion device according to Embodiment 2 of the present invention is shown. also, Image 6 show Figure 5 The circuit structure of the power conversion circuit 301 in FIG.

[0105] First, if Image 6 As shown, the power conversion circuit 301 in the second embodiment includes IGBTs 102uu, 102ud, 102vu, and 102vd (hereinafter, collectively referred to as "IGBT 102" as appropriate) and diodes 103uu, Two branches constituted by 103ud, 103vu, and 103vd (hereinafter, collectively referred to as "diode 103" as appropriate). Each branch has two arms connecting IGBT 102 and diode 103 in antiparallel. In this manner, the power conversion circuit 301 includes a main circuit of a single-phase inverter.

[0106] The emitter electrode of the upper arm and the collector electrode of th...

Embodiment approach 3

[0121] In Embodiments 1 and 2 described above, the control circuit 109 always executes the correction calculation of the control signal when the power conversion device is in operation. In contrast, in Embodiment 3, the correction amount of the control signal calculated once is continuously used without change. In addition, the third embodiment is suitable for the case where the current duty of each power conversion circuit is not affected by the external environment, and the structure of the power conversion device and the characteristics of components dominate as the main cause of the current duty imbalance. Wait.

[0122] use Figure 7 as well as Figure 8 Embodiment 3 will be described. In addition, differences from Embodiment 1 will be mainly described.

[0123] Figure 7 The overall configuration of the power conversion device according to Embodiment 3 of the present invention at the time of shipping test is shown.

[0124] In Embodiment 3, the correction calculati...

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Abstract

The invention provides an electric power conversion device and an adjusting method thereof. The electric power conversion device comprises a plurality of electric power conversion circuits and is small and cheap. The electric power conversion device is parallelly connected to a plurality of electric power conversion circuits (100). Each one of electric power conversion circuits (100) comprises a capacitance (101) charged by a DC power supply (108) and an inverter main circuit that converts the DC current to the capacitance (101) into AC current. The DC input current, which is supplied to the plurality of electric power conversion circuits (100) and is from the DC power supply (108), is almost zero.

Description

technical field [0001] The present invention relates to a power conversion device in which a plurality of power conversion circuits are connected in parallel and an adjustment method thereof. Background technique [0002] Power conversion devices such as inverters include: diodes; semiconductor components such as IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor), MOSFET (Metal Oxide Semiconductor Field Effect Transistor, Metal Oxide Semiconductor Field Effect Transistor); capacitors that supply instantaneous power; Driving circuits for semiconductor elements; sensors that monitor the output current and voltage of power conversion devices; control circuits that read the values ​​sent from each sensor, calculate desired actions, and send command signals for instructing the necessary actions of the driving circuit, etc. . The above-mentioned components constituting the power conversion device are designed in accordance with specifications such as vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/493H02M7/5387
CPCH02M7/493H02M7/53871
Inventor 松元大辅松本洋平保立尚史三间彬上妻央马渊雄一
Owner HITACHI LTD