JP5217336B2 - Static auxiliary power supply for vehicle - Google Patents

Description

The present invention relates to a vehicle dual static auxiliary power unit, in particular, is suitably applied to a resonance suppression method of the power conversion device having an LC smoothing circuit of a choke input system.

A CVCF (Constant Voltage Constant Frequency) device that always outputs AC power having a constant voltage and frequency is used as a stationary auxiliary power source for a vehicle that supplies electric power to lighting and an air conditioner of an electric railway vehicle.
FIG. 4 is a block diagram showing an example of a schematic configuration of a conventional stationary auxiliary power supply device for a vehicle.
In FIG. 4, the stationary auxiliary power supply device for a vehicle is provided with an inverter 14 that converts a direct current into an alternating current by a switching operation, and is connected to the direct current power supply 11 via an LC smoothing circuit 20 on the input side of the inverter 14. Yes. In addition, when the inverter 14 is used for a stationary auxiliary power source for vehicles, an overhead wire DC voltage can be used as the DC power source 11.

Here, the LC smoothing circuit 20 is provided with a DC reactor 12 and a DC filter capacitor 13, and the LC smoothing circuit 20 can constitute a choke input type LC filter. The LC smoothing circuit 20 is provided with an initial charging circuit in which a resistor 18 c is connected in parallel to the switch 19, and this initial charging circuit is connected in series to the subsequent stage of the DC reactor 12.
The output side of the inverter 14 is connected to the insulation transformer 17 via the filter reactor 15, and the filter capacitor 16 is connected to the output side of the filter reactor 15.

The DC voltage output from the DC power supply 11 is input to the inverter 14 after the high frequency component is removed by the LC smoothing circuit 20, and the inverter 14 converts the DC to AC. The AC voltage output from the inverter 14 is supplied to the insulation transformer 17 after unnecessary high frequency components are removed by the filter reactor 15 and the filter capacitor 16, and the AC voltage is transformed by the insulation transformer 17. Is done.
Here, when the DC filter capacitor 13 is initially charged, the switch 19 is opened, and the DC filter capacitor 13 is charged while the charging current is limited by the resistor 18c. When the voltage of the DC filter capacitor 13 reaches a predetermined value, the switch 19 is closed, whereby the resistor 18c is short-circuited, and an LC filter is configured.

In the control method of FIG. 4, a resonance phenomenon occurs between the DC reactor 12 and the DC filter capacitor 13 when the overhead DC voltage or the load suddenly changes, and the voltage and input current of the DC filter capacitor 13 vibrate and the stationary type for the vehicle. This vibration may continue due to the CVCF operation of the auxiliary power supply.
For such a phenomenon, Patent Document 1 discloses that when a vibration component in the filter capacitor terminal voltage of an inverter that performs constant voltage control is added to a reference voltage for constant voltage control and resonance occurs in the input filter, output is performed. A method of suppressing resonance of the LC filter by changing the voltage in synchronization with the input voltage is disclosed.

FIG. 5 is a block diagram showing another example of a schematic configuration of a conventional stationary auxiliary power supply device for a vehicle.
In FIG. 5, the stationary auxiliary power supply device for a vehicle includes an inverter 101, a filter reactor 102 and a filter capacitor 103 connected to the input side of the inverter 101, an output side isolation transformer 104 of the inverter 101, and a voltage sensor on the output side of the inverter 101 105, a current sensor 106, a reference voltage generation circuit 107, a reference current generation circuit 108, a control circuit 109, a voltage sensor 112 for detecting a terminal voltage of a DC power supply 110, a load 111, and a filter capacitor 103 by means of an overhead line of a train line, a voltage sensor 112 The high-pass filter 103 that extracts only the vibration component from the detected output is provided with an adder 104 that adds the output of the high-pass filter 103 to the reference voltage signal from the reference voltage generation circuit 107.
Then, the vibration component is extracted by the high-pass filter 113 from the applied voltage of the filter capacitor 103 detected by the voltage sensor 112 and added to the reference voltage signal from the reference voltage generation circuit 107, whereby the output voltage of the inverter 101 is obtained. Is changed in synchronization with the change in the terminal voltage of the filter capacitor 103.

FIG. 6 is a diagram showing a conventional LC resonance phenomenon suppressing method using an equivalent circuit.
6, a DC power source 11 in FIG. 4 VDC, DC reactor 12 reactor L, and represents the DC filter capacitor 13 capacitor C, the load current by a current source I _L, in order to suppress the LC resonance, the capacitor C It is necessary to connect the resistor R in parallel.
In the method of FIG. 5, by increasing the current supplied to the load when the DC voltage increases, an effect equivalent to that of the resistor R of FIG. 6 is produced, and the LC resonance is suppressed.
JP-A-9-140150

However, in the method of FIG. 5, by changing the output voltage, the resonance energy of the filter reactor 102 and the filter capacitor 103 is consumed on the load side, and the LC resonance is suppressed. For this reason, the method of FIG. 5 has a problem that, for example, when a constant power load such as an inverter air conditioner is connected to the stationary auxiliary power supply device for a vehicle, LC resonance cannot be suppressed. That is, even if it is attempted to control the power on the load side in order to suppress LC resonance, the necessary power is adjusted by the connected load device, so that the resonance energy cannot be consumed on the load side. Resonance cannot be suppressed.
An object of the present invention, even when the constant power load is connected, to provide a vehicle dual static auxiliary power device capable of suppressing the LC resonance generated by the LC smoothing circuit of a choke input system It is.

To solve the problems described above, according to the static auxiliary power unit for a vehicle according to claim 1 Symbol placement, an inverter for converting direct current into alternating current by switching operation, the choke input type connected upstream of the inverter An LC smoothing circuit, a filter that removes unnecessary high frequency components from the AC voltage output from the inverter, and an insulation transformer that transforms the AC voltage that has passed through the filter, and the reactor that constitutes the LC smoothing circuit the switch is connected in series to, the series circuit composed of the said reactor switch resistance are connected in parallel, wherein during the initial charging of the capacitor to form an LC smoothing circuit wherein the switch is opened, and this It is characterized by.

  As described above, according to the present invention, the resonance energy of the LC smoothing circuit can be consumed by the resistance on the power source side by connecting the resistor in parallel to the reactor constituting the LC smoothing circuit. For this reason, the LC resonance can be suppressed without consuming the resonance energy of the LC smoothing circuit on the load side, and even when a constant power load such as an inverter air conditioner is connected, a constant voltage and frequency are always maintained. AC power can be output.

  In addition, by connecting a resistor in parallel to a series circuit consisting of a reactor and a switch constituting the LC smoothing circuit, the resonance energy of the LC smoothing circuit is consumed on the power supply side while functioning as a current limiting resistor during initial charging of the capacitor. Even when a constant power load such as an inverter air conditioner is connected, it is possible to always output AC power having a constant voltage and frequency while suppressing an increase in the number of components and an increase in circuit scale. .

Hereinafter, a power converter according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a stationary auxiliary power device for a vehicle to which the power conversion device according to the first embodiment of the present invention is applied.
In the power converter of FIG. 1, a resistor 18 a connected in parallel to the DC reactor 12 is provided in addition to the configuration of the power converter of FIG. 4. 1, the initial charging circuit in which the resistor 18c is connected in parallel to the switch 19 in FIG. 4 is omitted, but this initial charging circuit may be provided.

  The DC voltage output from the DC power supply 11 is input to the inverter 14 after the high frequency component is removed by the LC smoothing circuit 20, and the inverter 14 converts the DC to AC. The AC voltage output from the inverter 14 is supplied to the insulation transformer 17 after unnecessary high frequency components are removed by the filter reactor 15 and the filter capacitor 16, and the AC voltage is transformed by the insulation transformer 17. Is done.

  Here, when a resonance phenomenon between the DC reactor 12 and the DC filter capacitor 13 occurs during an abrupt change in the overhead DC voltage or load, the resonance energy is consumed by the resistor 18a, and the LC resonance of the LC smoothing circuit 20 is suppressed. Therefore, LC resonance can be suppressed without consuming the resonance energy of the LC smoothing circuit 20 on the load side, and a constant voltage and frequency are always constant even when a constant power load such as an inverter air conditioner is connected. AC power can be output.

FIG. 2 is a diagram illustrating an LC resonance phenomenon suppressing method according to an embodiment of the present invention using an equivalent circuit.
In FIG. 2, VDC DC power source 11 in FIG. 1, a DC reactor 12 reactor L, and the DC filter capacitor 13 capacitor C, the resistor 18a R, to represent the load current by a current source I _L, satisfy the following relation By setting the value of the resistance R in this way, this equivalent circuit becomes non-vibrating, and LC resonance can be suppressed when the overhead wire DC voltage or the load suddenly changes.

FIG. 3 is a block diagram showing a schematic configuration of a stationary auxiliary power supply device for a vehicle to which the power conversion device according to the second embodiment of the present invention is applied.
In addition to the configuration of the power conversion device of FIG. 1, the power conversion device of FIG. 3 includes a switch 19 connected in series to the DC reactor 12, and instead of the resistor 18 a of FIG. A resistor 18b connected in parallel to the series circuit is provided.

  Here, when the DC filter capacitor 13 is initially charged, the switch 19 is opened, and the DC filter capacitor 13 is charged while the charging current is limited by the resistor 18b. When the voltage of the DC filter capacitor 13 reaches a predetermined value, the switch 19 is closed, and the DC reactor 12 and the DC filter capacitor 13 constitute an LC resonance circuit. When a resonance phenomenon occurs between the DC reactor 12 and the DC filter capacitor 13 when the overhead DC voltage or the load suddenly changes, the resonance energy is consumed by the resistor 18b, and the LC resonance of the LC smoothing circuit 20 is suppressed.

  This allows the resistor 18b to function as a current limiting resistor during initial charging of the DC filter capacitor 13, while consuming 20 resonance energy of the LC smoothing circuit with the resistor 18b, and a constant power load such as an inverter air conditioner is connected. Even in this case, it is possible to always output AC power having a constant voltage and frequency while suppressing an increase in the number of parts and an increase in circuit scale.

It is a block diagram showing a schematic structure of a stationary auxiliary power supply device for vehicles to which a power converter concerning a 1st embodiment of the present invention is applied. It is a figure which shows the suppression method of LC resonance phenomenon which concerns on embodiment of this invention with an equivalent circuit. It is a block diagram which shows schematic structure of the stationary auxiliary power supply device for vehicles with which the power converter device which concerns on 2nd Embodiment of this invention is applied. It is a block diagram which shows an example of schematic structure of the conventional static auxiliary power supply device for vehicles. It is a block diagram which shows the other example of schematic structure of the conventional static auxiliary power supply device for vehicles. It is a figure which shows the conventional suppression method of LC resonance phenomenon in an equivalent circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 DC power supply 12 DC reactor 13 DC filter capacitor 14 Inverter 15 Filter reactor 16 Filter capacitor 17 Isolation transformer 18a, 18b Resistance 19 Switch 20, 21 LC smoothing circuit

Claims (1)

An inverter that converts direct current to alternating current by switching operation;
A choke input LC smoothing circuit connected to the previous stage of the inverter;
A filter that removes unnecessary high frequency components from the AC voltage output from the inverter;
An insulation transformer that transforms the AC voltage that has passed through the filter;
Wherein the switch is in the reactor to form an LC smoothing circuit are connected in series, the reactor and resistor is connected in parallel to a series circuit comprising said switch, said during the initial charging of the capacitor constituting the LC smoothing circuit the switch is opened, this the vehicle static auxiliary power unit according to claim.

Images