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Power conversion apparatus

A technology of power conversion device and power converter, which is applied in the direction of output power conversion device, photovoltaic power generation, electrical components, etc., can solve problems such as inability to achieve high efficiency, and achieve the effect of improving power conversion efficiency and power conversion efficiency.

Active Publication Date: 2019-05-24
MITSUBISHI ELECTRIC CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of using a plurality of power converters with different power capacities, under the condition of low power, it is more difficult to use a plurality of power converters with a small power capacity than to use a single power converter with a large power capacity. High efficiency, under the condition of high power, it is more efficient when the power converter with high efficiency is preferentially used, etc., the conditions for achieving high efficiency are different, so there are conditions that cannot achieve high efficiency in Patent Document 1

Method used

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Embodiment approach 1

[0031] figure 1 It is a diagram showing an example of the configuration of the power conversion device according to Embodiment 1 of the present invention.

[0032] As shown in the figure, the power conversion device is equipped with a power sharing regulator 3. The power converter units 2 are connected in parallel at the output position. The power sharing regulator 3 adjusts each power converter unit (for example, Adjust the power value shared by each power converter unit). The power sharing regulator 3 has a function of acquiring power information corresponding to the rated efficiency point, maximum efficiency point, and allowable efficiency point of the power converter unit 2 used in the power conversion device. The requested power uses a value input to the power sharing regulator 3 from an external device, a control calculation result corresponding to an AC load or a flow power (see the dotted line connecting the load and the power sharing regulator 3 in the figure), or an...

Embodiment approach 2

[0105] Figure 8 It is a diagram showing a configuration example of an operation mode selection flow according to Embodiment 2 of the present invention. In the power conversion device according to the second embodiment, compared with the first embodiment, a high-efficiency charging and discharging function that does not require the second power threshold and the third power threshold can be realized. Figure 8 A flowchart for realizing this function is shown. That is, by using a predetermined ratio to the first power threshold to determine the second power threshold and the third power threshold of the plurality of power converter units 2 operated by the power sharing regulator 3, it is possible to achieve a higher power ratio than that of the embodiment. 1 Simplified high-efficiency charge and discharge functions. For example, in Figure 8 In, set to P 2 =0.6P 1 , P 3 =0.4P 1 .

[0106] In Embodiment 2, as in Embodiment 1, one of the plurality of power converter units...

Embodiment approach 3

[0108] Figure 9It is a diagram showing a configuration example of an operation mode selection flow according to Embodiment 3 of the present invention. In addition to the configuration of Embodiment 1, the power conversion device according to Embodiment 3 is configured such that the power conversion efficiencies corresponding to the first power threshold to the third power threshold and the first power threshold and the second power threshold are used. The efficiency characteristic η obtained by linear approximation of the power conversion efficiency corresponding to the power threshold 1 and the efficiency characteristic η obtained by linearly approximating the power conversion efficiency corresponding to the second power threshold and the third power threshold 2 To realize the function of improving high-efficiency charging and discharging. Furthermore, for a linear approximation of the efficiency characteristic from the 3rd power threshold to zero, the efficiency character...

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Abstract

This power conversion apparatus has: DC power sources; power converter units; and a power contribution adjuster that individually adjusts power of the power converter units, wherein when the power converter units having the DC power sources connected thereto on the input sides are connected in parallel on the output side, power contribution of each of the power converter units is adjusted by the power contribution adjuster such that the efficiency of the apparatus overall improves, by utilizing three thresholds regarding rated power, maximum efficiency power, and permissible efficiency power from among efficiency characteristics of each of the power converter units.

Description

technical field [0001] The present invention relates to improving the efficiency of electrical conversion in a power conversion device in which power converter units are multiplexed in parallel at an input side or an output side. Background technique [0002] In recent years, the market for power storage devices such as solar power generation devices, electric vehicles, and emergency power supplies has expanded, and devices that combine these devices are used in zero-energy houses and zero-energy houses where the power purchased from the power system is zero. The technological development of the building has attracted attention. However, when a plurality of different power storage devices are multiplexed and used in parallel, there may be a problem in restricting the power storage devices according to the charging and discharging power compared to charging and discharging all the power storage devices with the same ratio of power sharing. Conditions for higher efficiency wh...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02J3/46H02M7/493
CPCH02J3/46H02M7/48H02M7/493Y02E10/56H02J1/10H02J3/38
Inventor 川井由宇
Owner MITSUBISHI ELECTRIC CORP
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