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Power conversion device and control method of power conversion device

A technology of power conversion device and control method, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., which can solve the problems of high cost, increased inverter operating cost, and increased switching loss And other issues

Active Publication Date: 2019-10-25
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the switching loss increases
In addition, in order to solve this problem, the cooling device of the inverter is increased in size and cost.
In addition, the operating cost of the inverter also increases

Method used

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  • Power conversion device and control method of power conversion device
  • Power conversion device and control method of power conversion device
  • Power conversion device and control method of power conversion device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0031] First, the first embodiment will be described. Hereinafter, the description of the parts common to the above-mentioned conventional configuration will be omitted, and the description will focus on the different parts.

[0032] figure 1 It is a figure which shows an example of the structure of the power conversion apparatus of 1st Embodiment. Additionally, in the figure 1 , against the above Figure 7 Common elements are assigned the same reference numerals.

[0033] The NPC inverter 100 constituting the power conversion device 1 is Figure 7Shown is the same usual three-phase NPC inverter. However, it is not limited to this example. For example, in this embodiment, an NPC inverter is exemplified as a neutral point clamp type power converter, but it may be implemented by replacing it with an NPC converter. In addition, the neutral point clamp may be a T-type neutral point clamp or other types.

[0034] In this power conversion device 1, there are further function...

no. 2 Embodiment approach

[0071] Next, a second embodiment will be described. Hereinafter, the description of the parts common to the first embodiment will be omitted, and the different parts will be mainly described.

[0072] The structure and figure 1 Same as shown. However, the control device 10 of the second embodiment has the same figure 2 A judging unit (not shown) different from the judging unit 13 shown switches the control mode with a judging criterion different from that of the first embodiment.

[0073] The control device 10 of the second embodiment performs switching from the second control mode to the first control mode (or switching from the first control mode to the second control mode) according to the operating conditions of the NPC inverter 100 . The operating conditions to which the first control mode is applied or the operating conditions to which the second control mode is applied are set in advance using, for example, a modulation factor and a power factor. In addition, it i...

no. 3 Embodiment approach

[0077] Next, a third embodiment will be described. Hereinafter, the description of the parts common to the first embodiment will be omitted, and the description will focus on the different parts.

[0078] The configuration of the power conversion device according to the third embodiment and figure 1 Same as shown. However, the control device 10 of the third embodiment also has the function of, in the second control mode, according to the upper arm voltage command value v up and the voltage command value v for the lower branch un Each state changes the carrier frequency of the NPC inverter 100 .

[0079] For example, the control device 10 has the function of using the voltage command value v in the upper branch up and the voltage command value v for the lower branch un When the two are not 0, the carrier frequency is reduced to, for example, the usual 1 / 2 frequency, or the semiconductor switching element S of the upper branch 1 , S 2 , S 5 with the lower branch semicon...

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Abstract

A power conversion device according to the embodiment includes a control device (10) having a mechanism for switching and implementing a first control mode and a second control mode. In the first control mode, a first voltage command value and a second voltage are generated based on new voltage command values of phases obtained by superimposing zero-phase voltages of a power converter (100) according to voltage command values for the phases of the power converter (100). In the second control mode, the first voltage command value and the second voltage command value are generated based on the voltage command values of each phase of the power converter (100) and the maximum and minimum values.

Description

[0001] This application claims priority on the basis of Japanese Patent Application No. 2018-076721 (filing date: April 12, 2018), and this application incorporates the entire content of this application by referring to this application. technical field [0002] Embodiments of the present invention relate to a power conversion device and a control method for the power conversion device. Background technique [0003] A power converter for converting direct current and alternating current is also called an inverter or a converter, and is used in a wide range of fields in society. The most basic inverter is a two-level (level) inverter formed by two semiconductor switching elements, and outputs two voltage levels with one pin. [0004] On the other hand, there are neutral point clamped (NPC (Neutral-Point-Clamped)) inverters as follows: Figure 7 As shown, for each phase, four semiconductor switching elements and two diodes (semiconductor switching elements may be used) are pro...

Claims

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Application Information

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IPC IPC(8): H02M7/487
CPCH02M7/487H02M1/0025H02M7/4833
Inventor 儿山裕史影山隆久藤田崇
Owner KK TOSHIBA
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