Power conversion device

A power conversion device and power conversion technology, applied in the direction of output power conversion devices, electric traction, control devices, etc., can solve the problems of power conversion devices that cannot operate normally or stop, and achieve the goal of suppressing transient oscillation and maintaining normal operation Effect

Active Publication Date: 2015-01-21
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the power conversion device applied to electric locomotives, electrical oscillations occur in the LC filter circuit due to fluctuations in the voltage of the DC power supply and overhead lines, etc.
At this time, if the capacitor becomes overvoltage as a result of the transient oscillation of the capacitor voltage of the LC filter circuit, the power conversion device may not operate normally or stop.
Especially in the case of drastic fluctuations in the voltage of the DC power supply, etc., such failures are prone to occur.

Method used

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Embodiment approach 1

[0022] The first embodiment will be described with reference to the drawings. figure 1 It is a figure which shows the structural example of the power conversion apparatus in Embodiment 1 of this invention. The power conversion device is connected to the overhead line 1 via the power collector 2 and is also connected to the rail 4 via the wheels 3. The overhead line 1 and the rail 4 are connected to a substation (not shown) serving as a DC power source, the current collector 2 receives electric power from the overhead line 1, and the wheels 3 are connected to the rail 4 as a return circuit for return current.

[0023] The power conversion device has: an LC filter circuit consisting of a reactor 5 and a capacitor 6, which is used to suppress the flow of higher harmonic currents to the overhead line 1 side; a voltage detector 7, which detects the DC voltage EFC of the capacitor 6; a power conversion circuit 10 , Connected in parallel with the capacitor 6, composed of the upper arm s...

Embodiment approach 2

[0086] As the power conversion circuit 10, in the first embodiment, a case where a DC-DC converter is used is described, but in the second embodiment, a case where a DC-AC conversion circuit (inverter) is described. In the structure in which the DC-AC conversion circuit is used to drive and control the motor, a negative resistance characteristic is generated on the input side of the power conversion circuit based on the principle explained in the first embodiment.

[0087] Picture 9 It is a figure which shows the structure of the power conversion device in Embodiment 2. The power conversion device is connected to the overhead line 1 via the power collector 2 and is also connected to the rail 4 via the wheels 3. The overhead line 1 and the rail 4 are connected to a substation (not shown) serving as a DC power source, the current collector 2 receives electric power from the overhead line 1, and the wheels 3 are connected to the rail 4 as a return circuit for return current.

[0088...

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PUM

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Abstract

Problem to be solved: To provide an electric power conversion device that normally operates, even when the voltage of a DC power supply or the like changes, by suppressing electric oscillations in an LC filter circuit so as to suppress transient oscillations in the voltage of the capacitor. Solution: An electric power conversion device includes a power conversion circuit for receiving electric power from an overhead wire through an LC filter circuit composed of a reactor and a capacitor and converting the electric power to output and a control unit for controlling the power conversion circuit, wherein the control unit is provided with a delay unit for delaying the voltage across the capacitor so as to produce a first control signal, produces a second output voltage instruction from the first control signal and a first output voltage instruction specifying the magnitude of the output voltage of the converted power, and controls the power conversion circuit based on the second output voltage instruction.

Description

Technical field [0001] The present invention relates to a power conversion device suitable for an electric locomotive that obtains electric power from a DC power source via an overhead line (including a third rail, etc.). Background technique [0002] Generally, a collector device for an electric locomotive obtains electric power from an overhead line and uses the collected electric power to drive a motor to travel. The drive control of a known electric motor is performed by a power conversion device that converts the collected electric power by an inverter as a DC-AC conversion circuit into three-phase AC and supplies it to the motor. [0003] In addition, in recent years, the performance of power storage elements such as secondary batteries and electric double-layer capacitors has gradually improved. Therefore, they are mounted on electric locomotives, and the power from the power storage elements and the power from overhead lines are used together. The development of a system i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48B60L9/18H02M3/155
CPCB60L2200/26B60L2240/423Y02T10/643Y02T10/7022H02M2001/0022B60L11/1803H02M3/156Y02T10/7005B60L2240/421B60L11/1805B60L11/005B60L9/22B60L15/025B60L2210/10Y02T10/7216B60L9/04B60L50/40B60L50/51B60L50/52H02M1/0022Y02T10/64Y02T10/70Y02T10/72
Inventor 北中英俊
Owner MITSUBISHI ELECTRIC CORP
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