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Electric power converter apparatus

一种电力变换装置、电力变换器的技术，应用在电气元件、不可逆的直流功率输入变换为交流功率输出的、交流电动机控制等方向，能够解决流过较大电流等问题，达到稳定电动机驱动、防止转矩脉动和过大电流的效果

Active Publication Date: 2008-04-23
HITACHI IND PROD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at this time, the output voltage changes rapidly from the state of decrease (increase at this time), and a large current may flow through this potential difference.

Method used

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  • Electric power converter apparatus
  • Electric power converter apparatus
  • Electric power converter apparatus

Examples

Experimental program
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Embodiment 1

[0022] use figure 1 To Fig. 4, for the power conversion device of this embodiment and Figure 8 Different parts of the conventional example will be described. figure 1 means the whole, figure 2 express action, image 3 A part of the configuration of this embodiment is shown. In addition, in FIG. 4, the simulation result in the prior art and this invention is shown about the electric current at the time of power supply fluctuation. exist figure 1 Among them, a voltage command correction unit 10 is provided between the voltage command calculation unit 8 and the gate pulse generation unit 9 . The interior of the voltage command correction unit 10 will be described below. In the DC voltage estimation unit 21, the inverter output voltage detection unit VFB and the final voltage command value V *** , to calculate the estimated value of DC voltage Vdc^( figure 2 (a)). exist figure 2 In , as an example, the case where the power supply voltage is reduced from the rated v...

Embodiment 2

[0031] Next, the differences between the second embodiment of the present invention and the first embodiment will be described. In the first embodiment, xV is calculated separately * and xV ** , respectively for V * Perform multiplication to calculate the final voltage command V *** , but in addition, it is also possible to directly find the equivalent xV * ×xV ** The value can also be based on V * direct operation V *** . In addition, xV can also be found * , xV ** as for V * correction ratio, not for V * perform multiplication, while the V * The correction term is obtained by performing an addition operation for correction. In addition, V * , V ** It does not need to be an alternating current, and may be a direct current voltage command value for general d-axis and q-axis vector control. V *** When it is the DC voltage of the d and q axes, V *** Coordinate transformations are output for AC. In this embodiment, the same effect as that of the first embodiment...

Embodiment 3

[0033] Next, use Figure 5 , the operation in the voltage command correction unit 30 of the third embodiment of the present invention will be described. In this embodiment, the power supply voltage estimation and the voltage command calculation are the same as in the first embodiment, and the DC voltage estimation unit 21, the voltage command correction value calculation unit A22, and the voltage command correction unit A24 are used to calculate the output voltage. for the fixed voltage command V ** . In the voltage command correction unit C31, the voltage command V is lowered so that the output voltage does not saturate when the power supply voltage is lowered. ** . The difference from the first embodiment is that in the voltage command correction unit C31, when the power supply voltage increases, |VFB| ** , output V *** . This increasing change rate only needs to be delayed from the increasing change rate of Vdc .

[0034] As described above, this embodiment is charac...

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PUM

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Abstract

An electric power converter apparatus having a function of converting a power source voltage into an AC voltage having an arbitrary frequency and maintaining an output voltage constant even on the power source variation, in which the electric power converter apparatus decreases the output voltage when the output voltage drops to equal to or less than a predetermined value, afterward, increases the output voltage in response to a predetermined rate of change when the power source voltage rises.

Description

technical field [0001] The present invention relates to a power conversion device that converts a power supply voltage to an alternating current of an arbitrary frequency based on a voltage command value, and particularly relates to a voltage control technique when the power supply voltage fluctuates during variable speed operation of a motor. Background technique [0002] use Figure 8 A conventional example of a power conversion device for driving, for example, a motor will be described. exist Figure 8 In this example, the three-phase AC voltage from the commercial power supply 1 is rectified by the diode unit 2 and smoothed by the smoothing capacitor 3 to convert it into a DC voltage Vdc. Vdc is converted into an AC voltage by the inverter unit 4 . The output voltage from the inverter is applied to the motor 7, causing the motor to rotate. In addition, as means for controlling the inverter unit 4, in the voltage DC calculation unit 8, the detected current IFB and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02P27/06
CPCH02P21/0003
Inventor 永田浩一郎奥山俊昭冈松茂俊宫崎晃一
Owner HITACHI IND PROD LTD
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