JP6154347B2 - Power converter - Google Patents

Description

  Embodiments of the present invention relate to a power conversion device in which the shape of a disconnection BUS that cuts off a route connecting a stack and a load in the power conversion device is different between the U phase, the V phase, and the W phase.

  In a power converter for a ship, it is necessary to perform replacement work in a ship that shakes when a stack failure occurs. Since the weight of the stack is about 200 kg, there is a problem that the insertion / removal work at the time of stack replacement is bad and takes time.

Japanese Patent No. 2685438

  Conventionally, a faulty stack unit stored in a rack is taken out, and a spare stack unit is inserted and attached to the taken out stack unit. Between the output terminal of the attached stack unit and the output BUS connected to the load. We were connected by disconnection BUS. However, since the shape of this disconnection BUS is the same in the U phase, the V phase, and the W phase, there is a problem of erroneous connection.

  The present invention has been made in order to solve the above-described problem. By using an output conductor corresponding to the disconnection BUS of the stack unit in which a failure has occurred as an output conductor of the spare stack unit, it is possible to prevent erroneous connection. It aims at providing the power converter device which can shorten the recovery time after a failure.

In order to achieve the above object, a power conversion device according to the present invention is a power conversion device configured by housing a plurality of stack units, a spare stack unit, and a control unit for controlling the stack unit in a panel. The unit includes an input BUS for capturing a DC power source, an inverter unit for converting the DC power source captured from the input BUS to an AC power source, and a stack unit including a phase output terminal for outputting a phase voltage generated by the inverter unit; A phase output BUS for supplying a phase voltage output to the phase output terminal to a load, and a phase output conductor connecting the phase output terminal and the phase output BUS, the stack being attached to the board The control unit is detachably housed in units, and the control unit is a switch that constitutes an inverter unit of the stack unit for each stack unit. Is connected to the gate terminal of the quenching device, by controlling the switching element to generate a phase voltage outputted from said inverter section, said phase output conductor has a different shape for each phase voltage.

  According to the present invention, when a failure occurs in the stack unit, the output conductor of the stack unit is used as the output conductor of the spare stack unit, so that erroneous connection can be prevented and the recovery time after the failure can be shortened.

Schematic which shows the structure of the power converter device which concerns on Example 1. FIG. 1 is a circuit diagram of a power conversion apparatus according to Embodiment 1. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an example of a schematic configuration diagram illustrating a configuration of the power conversion apparatus 1000 according to the first embodiment of the present invention. The illustrated power conversion apparatus 1000 includes four stack units obtained by adding a spare stack unit 400 to a plurality of stack units including a U-phase stack unit 100, a V-phase stack unit 200, and a W-phase stack unit 300, and a control unit 60. Configured.

  Four stack units obtained by adding a spare stack unit to the plurality of stack units are arranged (stacked) in two stages and two rows with respect to a panel (rack) and stored.

  The stack unit is a unit in which, for example, an inverter circuit and related parts are integrally formed, and has a form that can be incorporated into or removed from a panel (rack). That is, the stack unit is detachably stored in the board.

  The DC power supply is provided with a P (Positive) phase, an N (Negative) phase, and a ground phase C, and a predetermined voltage is output between the phases. In the illustrated example, a DC voltage + E (V) is supplied between the C phase and the P phase (hereinafter referred to as C-P), and a DC voltage is provided between the C phase and the N phase (hereinafter referred to as C-N). The case where voltage -E (V) is supplied is shown.

  The DC power composed of the DC voltage ± E (V) is supplied to the stack via the input BUS (input-side disconnection BUS) and the fuse. Since all of the U-phase stack unit 100, the V-phase stack unit 200, the W-phase stack unit 300, and the spare stack unit 400 are configured in the same manner, here, the U-phase stack unit 100 will be described.

  The U-phase stack unit 100 includes a U-phase input BUS (input-side disconnect BUS) (15a, 15b, 15c), a fuse (16a, 16b, 16c), a U-phase stack 10 and a U-phase output BUS (19a, 19b, 19c). And so on. FIG. 1 shows a case where both ends of the fuse are short-circuited without using the U-phase fuse 16b.

  The U-phase output voltage Vu of the U-phase stack 10 is output to the U-phase output terminal 17. The U-phase output terminal 17 is connected to a U-phase output BUS (output-side disconnection BUS) 19 a by a U-phase output conductor 18.

  Similarly, the V-phase output voltage Vv of the V-phase stack 20 is output to the V-phase output terminal 27. The V-phase output terminal 27 is connected to a V-phase output BUS (output-side disconnection BUS) 29b by a V-phase output conductor 28.

  Similarly, the W-phase output voltage Vw of the W-phase stack 30 is output to the W-phase output terminal 37. The W-phase output terminal 37 is connected to a W-phase output BUS (output-side disconnection BUS) 39c by a W-phase output conductor 38.

  The U-phase output conductor 18, the V-phase output conductor 28, and the W-phase output voltage 38 have different shapes as shown in the figure, and the U-phase output conductor 18 can be connected only to the U-phase output BUS 19a. Similarly, the V-phase output conductor 28 can be connected only to the V-phase output BUS 29b. Similarly, the W-phase output conductor 38 can be connected only to the W-phase output BUS 39c.

  The spare stack unit 400 is configured in the same manner as the U-phase stack unit 100 described above, and when a failure occurs in any of the U-phase stack unit 100, the V-phase stack unit 200, or the W-phase stack unit 300 described above, Can be used in place of the stack unit where

  FIG. 2 is a circuit diagram of the power conversion apparatus 1000 according to the first embodiment. The power conversion apparatus 1000 shown in the figure includes a U-phase stack unit 100, a V-phase stack unit 200, a W-phase stack unit 300, a spare stack unit 400, and a control unit 60. In the present embodiment, the case where the output voltage of each stack unit described above is connected to the electric motor 50 as a load will be described.

  In the stack units 100 to 400 according to the present embodiment, an inverter is provided as a main component, and each stack unit is configured in the same manner. Therefore, the description will focus on the description of the U-phase stack unit 100. Description of the other stack units 200 to 400 is omitted.

  The U-phase stack unit 100 includes a power switch SW1, a U-phase input BUS (15a, 15b, 15c), a fuse (16a, 16b (omitted in the embodiment), 16c), a U-phase stack unit 10, and a U-phase output. The conductor 18 and the U-phase output BUS19 (generic name of 19a, 19b, 19c) are included.

  The U-phase stack unit 10 includes smoothing units 11 a and 11 b, snubber units 12 a and 12 b, and an inverter unit 13.

  The DC power is supplied via the power switch SW1, and + E (V) is supplied between CP and -E (V) is supplied between CN.

  The smoothing unit 11a includes a capacitor C1 and a bleeder resistor R1 connected in parallel to the capacitor C1. The smoothing unit 11b includes a capacitor C2 and a bleeder resistor R2 connected in parallel to the capacitor C2, and smoothes the supplied DC power.

  The snubber portions 12a and 12b have a function of reducing the spike voltage when the switching element configured by the semiconductor element according to the present embodiment is turned on / off has a high frequency component. The snubber part may be omitted by achieving a low inductance of the circuit.

  In the inverter unit, four switching elements Q1 to Q4 are connected in series to both ends of the DC power supply + E (V) and −E (V) to be supplied. For example, IEGT (Insulated Gate Bipolar Transistor) is used as the switching element, etc. Diodes (reflux diodes) DF1 to DF4 are connected in antiparallel to the switching elements Q1 to Q4, respectively. In addition, it is configured by clamp diodes DP, DN, etc. The gate terminals of the switching elements Q1 to Q4 are connected to the gate signal input unit 14, and the U-phase control of the control unit 60 is performed by the signal line 61. The switching unit Q1 to Q4 are on / off controlled by the control unit 60, and the U-phase output voltage Vu is output to the U-phase output terminal 17.

  The gate terminals of switching elements Q1 to Q4 (not shown) constituting the inverter unit of the V-phase stack unit 20 are connected to the V-phase gate signal input unit 24, and the V-phase control unit of the control unit 60 is connected by a signal line 62. 60b. The control unit 60 performs on / off control of the switching elements Q <b> 1 to Q <b> 4 and outputs the V-phase output voltage Vv to the V-phase output terminal 27.

  Gate terminals of switching elements Q1 to Q4 (not shown) constituting the inverter unit of the W-phase stack unit 30 are connected to the W-phase gate signal input unit 34, and a V-phase control unit of the control unit 60 is connected by a signal line 63. 60c. The control unit 60 performs on / off control of the switching elements Q <b> 1 to Q <b> 4 and outputs the W-phase output voltage Vw to the W-phase output terminal 37.

  When the gate terminals of switching elements Q1 to Q4 (not shown) constituting the inverter part of the spare stack part 40 are incorporated in the panel, the signal lines are not connected, but the stack units 100 other than the spare stack unit 400 are not connected. When a failure occurs in any one of ˜300, the signal line connecting the gate signal input unit of the stack unit where the failure has occurred and the control unit 60 is connected to the gate signal input unit of the spare stack unit 400 and the control unit 60. Used for connecting signal lines.

  For example, when a failure occurs in the U-phase stack unit 100, the power switch SW1 of the U-phase stack unit 100 is turned off. Next, the U-phase output conductor (output-side disconnection BUS) 18 is removed. As a result, the load connected to the U-phase stack unit 100 is disconnected. Next, the signal line 61 that connects the gate signal input unit 14 of the U-phase stack unit 100 where the failure has occurred and the U-phase control unit 60a of the control unit 60 is removed.

  Next, it is confirmed that the power switch SW4 of the spare stack unit 400 is in the OFF state. Next, the removed U-phase output conductor 18 connects between the output terminal 47 of the spare stack unit 400 and the U-phase output BUS 49a.

  Next, the spare stack unit 400 and the U-phase control unit 60a of the control unit 60 are connected using the removed signal line 61. Further, after confirming that the spare input BUS (45a, 45b, 45c) is connected, the power switch 4 is turned on. By this operation, the function of the U-phase stack unit 100 in which a failure has occurred can be replaced by the spare stack unit 400.

  When a failure occurs in the stack unit, the fuse is often cut off. If the fuse blows, replace the blown fuse.

  As described above, according to the first embodiment, when a failure occurs in the stack unit, the output conductor of the stack unit in which the failure has occurred and the signal line that controls the gate of the stack unit are removed and removed. The spare stack unit is connected using the output conductor and the signal line. Since the output conductor has a different shape for each of the U phase, V phase, and W phase, erroneous connection can be prevented by using the removed output conductor for the spare stack unit. In addition, it is not necessary to insert / remove heavy objects (about 200 kg) of the stack unit main body as compared with the case where a failed stack unit is removed and a spare stack unit is attached thereto, so that the failure can be easily recovered. Note that a stack unit that has failed can be repaired slowly at a later date.

100 U-phase stack unit 10 U-phase stack unit 14 U-phase gate signal input units 15a, 15b, 15c U-phase input BUS
16a, 16c Fuse 17 U phase output terminal 18 U phase output conductor 19a, 29a, 39a, 49a U phase output BUS
200 V-phase stack unit 20 V-phase stack unit 24 V-phase gate signal input units 25a, 25b, 25c V-phase input BUS
26a, 26c Fuse 27 V-phase output terminal 28 V-phase output conductors 19b, 29b, 39b, 49b V-phase output BUS
300 W-phase stack unit 30 W-phase stack unit 34 W-phase gate signal input units 35a, 35b, 35c W-phase input BUS
36a, 36c Fuse 37 W-phase output terminal 38 W-phase output conductors 19c, 29c, 39c, 49c W-phase output BUS
400 Spare stack unit 40 Spare stack unit 44 Spare gate signal input unit 45a, 45b, 35c Spare input BUS
46a, 46c Fuse 47 Preliminary voltage output terminal 50 Electric motor 60 Controller 60a U phase controller 60b V phase controller 60c W phase controller

Claims (3)

A power conversion device configured by housing a plurality of stack units and spare stack units and a control unit for controlling the stack units in a panel,
The stack unit is
An input BUS for capturing a DC power supply;
A stack unit including an inverter unit that converts a DC power source captured from the input BUS into an AC power source, and a phase output terminal that outputs a phase voltage generated by the inverter unit;
A phase output BUS for supplying a phase voltage output to the phase output terminal to a load;
A phase output conductor connecting the phase output terminal and the phase output BUS;
With
Removably stored in units of the stack unit with respect to the panel,
The controller is
For each stack unit, connected to the gate terminal of the switching element constituting the inverter unit of the stack unit, and by controlling the switching element, the phase voltage output from the inverter unit is generated,
The phase output conductor is:
A power conversion device having a different shape for each phase voltage. The plurality of stack units are:
U-phase stack unit, V-phase stack unit and W-phase stack unit,
The said board accommodates four stack units which added the preliminary | backup stack unit to these stack units in 2 steps | paragraphs and 2 rows, and can attach any stack unit so that attachment or detachment is possible. 1. The power conversion device according to 1. The board further includes
When a failure occurs in any of the plurality of stack units, the phase output conductor connecting the phase output terminal and the phase output BUS of the stack unit in which the failure has occurred is removed, and the phase output terminal and the phase output of the spare stack unit are removed. A stack in which the failure occurs by using the signal line connecting the faulty stack unit and the control unit as a signal line connecting the spare stack unit and the control unit, as well as a phase output conductor for connecting the BUS 3. The power conversion device according to claim 2, wherein the unit can be replaced with a spare stack unit without changing the unit mounting position.

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