JP2010239686A - Auxiliary power supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress an inrush current to prevent inductive interference when a new load is started, in an auxiliary power supply device. <P>SOLUTION: As for a current value detected by a first current detector 27a, adjacent to the output side of an inverter 26, whether the value exceeds a predetermined value α or not is determined by a comparison part 29b, after a variable calculation part 29a in a control unit 28 calculates a change ratio of a current. When the value exceeds an α value, at least either an output voltage control unit 29c or an output frequency control unit 29d sends a command to an inverter element signal generating part 29e for lowering either the output voltage or the output frequency. The inverter 26 carries out a received signal to reducing an input/output power to the auxiliary power supply device 20 and suppress an inrush current. Thus, inductive interference is prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an auxiliary power supply device.

FIG. 10 is a connection configuration diagram of a conventional auxiliary power supply device and a load. In the conventional invention, the overhead wire 1 and the pantograph 2 are connected, and the pantograph 2 is connected to the first auxiliary power supply device 3 and the second auxiliary power supply device 4 provided in parallel with the first auxiliary power supply device 3. .

The first auxiliary power supply 3 is connected to the load 8 via the contactor 5, and the second auxiliary power supply 4 is connected to the load 9 and the load 10 provided in parallel with the load 9 via the contactor 6. Is done. A changeover switch 7 is provided between the load 8 and the loads 9 and 10.

The load 8 and the load 9 are constituted by a blower (not shown), and the load 10 is connected in parallel with an air conditioner 10b, an oil pump 10c, and a brake compressor 10d as shown in the conventional load configuration diagram of FIG. It is the structure which was made. The current detector 10a is installed immediately on the input side of the brake compressor 10d, that is, between the oil pump 10c and the brake compressor 10d connected in parallel.

The overhead line 1 supplies the overhead line power from the power plant via the pantograph 2 to the first auxiliary power supply device 3 and the second auxiliary power supply device 4 that convert them into alternating current. When the first auxiliary power supply device 3 and the second auxiliary power supply device 4 operate normally, the first auxiliary power supply device 3 supplies the electric power converted into alternating current to the load 8 via the contactor 5, and the second auxiliary power supply device 3. The auxiliary power unit 4 supplies the electric power converted into alternating current to the load 9 and the load 10 through the contactor 6. At this time, the changeover switch 7 is opened and in the OFF state.

Next, when the second auxiliary power supply 4 breaks down and only the first auxiliary power supply 3 supplies power to the load 9 and the load 10 in addition to the load 8, the contactor 6 is turned off and switched. Switch 7 is ON
Thus, it becomes possible to switch the power supply of the load 8, the load 9, and the load 10 to the first auxiliary power supply device 3.

As described above, when the first auxiliary power supply 3 supplies power to a new load, the input power input from the overhead line to the first auxiliary power supply 3 also increases instantaneously. If the input power of the auxiliary power supply device changes abruptly, it may affect the signal equipment mounted on the vehicle and may cause an inductive failure that causes malfunction or the like.

Therefore, the following control system operates when the load 8, the load 9, and the load 10 are connected.

The current detector 10a of the brake compressor 10d detects that a starting current has flowed into the brake compressor 10d. Next, the input power to the load 9 and the load 10 added to the first auxiliary power supply 3 is compensated by reducing the input power of the first auxiliary power supply 3 and generating regenerative power from the load 8. There has been proposed an invention capable of suppressing a sudden increase in input current to one auxiliary power supply device (see, for example, Patent Document 1).

JP 2007-244035 A

In the conventional electric vehicle power supply device, a current detector is installed between the brake compressor and the oil pump. Therefore, when a starting current flows through a load other than the brake compressor, the starting current cannot be detected, and the control system for preventing the inrush current does not operate. In addition, since the current detector starts the control system when the starting current exceeds a predetermined value, the control operation may not be in time for the rapid increase in input power, and the inrush current may not be prevented.

The present invention has been made to solve the above-described problems, and an auxiliary power supply apparatus that can improve control accuracy by more appropriately controlling the current in the circuit in order to prevent inductive failure. The purpose is to provide.

The above problem is an inverter unit that converts a current to be supplied to a load mounted on a vehicle body by switching of a semiconductor element, an AC filter that is connected to the inverter unit and rectifies a current flowing from the inverter unit to the load, A current detector installed between the inverter unit and the AC filter, a calculation unit that calculates a current change rate based on a current value detected by the current detector, and a change rate calculated by the calculation unit A comparator that determines whether or not a predetermined value has been exceeded, and when it is determined that the current change rate calculated by the comparator has exceeded a predetermined value, at least one of the output voltage and output frequency of the inverter is reduced. This can be achieved by providing an inductive failure prevention unit.

According to the present invention, since the control accuracy can be improved by more appropriately controlling the current in the circuit, it is possible to prevent an inductive failure due to an inrush current.

The electrical block diagram of the auxiliary power supply based on the 1st Embodiment of this invention. The load block diagram based on the 1st Embodiment of this invention. The control system figure based on the 1st Embodiment of this invention. FIG. 3 is an operation diagram of each device in the first embodiment of the present invention. FIG. 4 is an example of a control pattern for a small amount of starting current in the first embodiment of the present invention. An example figure of a control pattern to a big starting current in a 1st embodiment to the present invention. The electrical block diagram of the auxiliary power supply based on the 2nd Embodiment of this invention. The control system figure based on the 2nd Embodiment of this invention. The control system figure based on the 3rd Embodiment of this invention. The conventional auxiliary power unit and load connection configuration diagram. The block diagram of the conventional load.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an electrical configuration diagram of an auxiliary power supply device according to the first embodiment of the present invention. FIG.
FIG. 3 is a load configuration diagram based on the first embodiment of the present invention.

As shown in FIG. 1, the auxiliary power supply device 20 according to the first embodiment of the present invention is connected to the overhead line 1 and the pantograph 2. The pantograph 2 includes a contactor 21 and an input reactor 22.
And an inverter unit 26 via a filter capacitor charging resistor short circuit switch 24 provided in parallel with the filter capacitor charging resistor 23 and the filter capacitor charger resistor 24.
And the filter capacitor 25 provided in parallel with the inverter unit 26. The inverter unit 26 is connected to a load 32 provided outside the auxiliary power supply device 20 via a first current detector 27 a, an AC filter 30, and a transformer 31. A control unit 28 is connected to the inverter unit 26 and the first current detector 27.

The control unit 28 is provided with a guidance failure prevention unit 29, and the variable calculation unit 29a is a comparison unit 29b.
The comparison unit 29b is connected to the output voltage control unit 29c and the output frequency control unit 29d. Next, the output voltage control unit 29c and the output frequency 29d are connected to the inverter element signal generation unit 29e. The inverter element signal generator 29e is connected to the inverter 2
6 is connected.

FIG. 2 is a configuration diagram of a load according to the present invention. The load 32 is connected to the auxiliary power supply device 20 via the three-phase line 33. The configuration includes a first air conditioner 32a, a second air conditioner 32b provided in parallel with the first air conditioner 32a, a first air conditioner 32a, and a second air conditioner 32b.
A third air conditioner 32c provided in parallel with the first air conditioner 32a and the second air conditioner 3.
The AC compressor 32d is provided in parallel with 2b and the third air conditioner 32c.

As shown in FIG. 1, the pantograph 2 sends the direct current received from the overhead line 1 to the auxiliary power supply device 20. When the contactor 21 is turned ON, the current flowing through the input reactor 22 and the filter capacitor charging resistor 23 is charged into the filter capacitor 25. When a constant current is charged in the circuit, the filter capacitor charging resistor When the short-circuit switch 24 is turned ON and a current flows through the inverter unit 26, the auxiliary power supply device 20 starts operating. The inverter unit 26 converts direct current into alternating current, and the alternating current filter 30 rectifies the alternating current. The rectified alternating current flows through the three-phase line and is supplied to the load 32, and becomes a power source for the load 32.

In the present embodiment, the first air conditioner 32a, the second air conditioner 32b, and the third air conditioner 32c.
Is the load 32A already activated, and the load 32B newly activates the AC compressor 32d.
In this case, the control system operation of the control unit 28 using the detection value detected by the first current detector 27 will be described in detail.

FIG. 3 is a control system diagram based on the first embodiment of the present invention. First, start up the load 32B (
The first current detector 27 detects the starting current (= Ioutput) flowing through S1) (
S2). The detected value is transmitted as an analog signal to the variable calculation unit 29a of the guidance failure prevention unit 29 in the control unit 28. The variable calculation unit 29a uses the value to change the current (= d
Ioutput / dT, I; current T; time) is calculated (S3). The calculated value is sent to the comparison unit 29b, and it is compared whether or not a predetermined value α set in order to prevent an inrush current has been exceeded (S4). When the α value is exceeded, the output voltage (Voutpu) from the inverter unit 26
t) and the output frequency (Foutput), it is necessary to change the output voltage control unit 2
9c and the output frequency control unit 29d transmit the change pattern of the output frequency and the output voltage to the inverter element signal generation unit 29e (S5). The inverter element signal generator 11e that receives the change pattern of the output voltage and the output frequency changes the output voltage and the output frequency of the auxiliary power supply device 20 by transmitting a digital signal for switching control of the inverter to the inverter unit 26. .
If the α value is not exceeded at this time, the process returns to the start and the same operation is repeated.

FIG. 4 is an operation diagram of each device during operation of the control system of the present invention. When the control system as described above is applied, the auxiliary power supply device 20 and the load 32 as a whole move as follows.

When the AC compressor 32d is activated and the input power to the auxiliary power supply 20 is increased, the output voltage and output frequency of the auxiliary power supply 20 are reduced. Thereby, the first air conditioner 32a
When the input current to the second air conditioner 32b and the third air conditioner 32c is reduced, the first air conditioner 32a, the second air conditioner 32b, and the third air conditioner 32c enter a regenerative operation. The regenerative energy of the first air conditioner 32a, the second air conditioner 32b, and the third air conditioner 32c is used in the circuit to compensate for the increase in input power accompanying the activation of the AC compressor 32d. From the above, even when the load 32B such as the AC compressor 32d is started, a rapid increase in the input power to the auxiliary power supply device 20 can be suppressed.

In addition, the present embodiment is a control system that can correspond to each value calculated by the current change detection unit 32b. FIG. 5 is an example of an operation diagram of output voltage / output frequency when a current having a small change rate flows in the present invention. FIG. 6 is an example of an operation diagram of output voltage / output frequency when a current having a large change rate flows in the present invention.

The rate of change of the current detected by the first current detector 27a as shown in FIG. 3 (= dIoutp
ut / dT, I; current T; time) is x, and the predetermined value α is classified into α1 and α2 (> α1).

FIG. 5 shows a case where α1 <x <α2, and the control system calculates the rate of change of current from the value,
Based on the calculated value, the output voltage and frequency of the auxiliary power supply device 20 are reduced.

FIG. 6 shows a case where α2 <x, and the control system calculates the rate of change of current from the value,
The output voltage and frequency are reduced based on the calculated value. Corresponding to each input power of the load 32 to be newly activated, the accuracy of the control system is improved.

At this time, if the newly activated load 32B is a load 32 having a frequency that is not different from that of the existing load 32A, it is possible to perform control only with the output voltage.

In the present embodiment, a first current detector 27 is provided between the inverter unit 26 and the AC filter 30.
It becomes possible to detect the output current from the inverter part 26 directly by installing. Therefore, the load to be attached to the auxiliary power supply is not limited, and can handle various types of loads. Furthermore, by calculating the rate of change of current corresponding to the starting current generated from each load, Can be controlled.

By improving the control accuracy in this way, even if a new load 32B is activated, it is possible to suppress a sudden increase in input power to the auxiliary power supply device 20 and to prevent an inductive failure caused by an inrush current. It becomes possible.

  In the present embodiment, the number of current detectors is not limited to one.

(Second Embodiment)
A second embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 7 is an electrical configuration diagram of an auxiliary power source according to the second embodiment of the present invention. FIG. 8 is a control system diagram based on the second embodiment of the present invention. In addition, about the thing which has the same structure as FIG. 1 thru | or FIG. 6, the same code | symbol is attached | subjected and description is abbreviate | omitted.

This embodiment is different from the first embodiment in that the second current detector 27b is installed on the input power side of the inverter unit.

Below, the point which provided the 1st current detector 27b in the input electric power side of an inverter part with reference to FIG. 7 is demonstrated.

As shown in FIG. 7, in the auxiliary power supply device 20 of the second embodiment based on the present invention, the second current detector 27 b includes a filter capacitor charging resistor 23 and a filter capacitor charger resistor 23 in parallel. The filter capacitor charging resistor short-circuit switch 24 provided, the inverter unit 26, and the filter capacitor 25 provided in parallel with the inverter unit 26 are connected. A control unit 28 is connected to the inverter unit 26 and the second current detector 27b. The configuration of the control unit 28 is the same as that of the first embodiment.
FIG. 8 is a control system diagram of this embodiment. First, the second current detector 27b detects the starting current (Iinput) that flows when the load 32B starts (S1) (S7). The detected value is transmitted as an analog signal to the variable calculation unit 29a of the guidance failure prevention unit 29 in the control unit 28. The variable calculation unit 29a uses the value to change the current (= input / dT, I;
Current T; time) is calculated (S8). The calculated value is sent to the comparison unit 29b, and the predetermined value β
Is compared (S9). When the output voltage (Voutput) and the output frequency (Foutput) from the inverter unit 26 need to be changed when the predetermined value β is exceeded, the output frequency and output are output from the output voltage control unit 29c and the output frequency control unit 29d. The voltage change pattern is transmitted to the inverter element signal generator 29e (S10). The inverter element signal generator 11e that receives the change pattern of the output voltage and the output frequency changes the output voltage and the output frequency of the auxiliary power supply device 20 by transmitting a digital signal for switching control of the inverter to the inverter unit 26. .
If the α value is not exceeded at this time, the process returns to the start and the same operation is repeated.

At this time, if the newly activated load 32B is a load 32 having a frequency that is not different from that of the existing load 32A, it is possible to perform control only with the output voltage.

In the auxiliary power supply device having such a configuration, the same effect as in the first embodiment can be obtained.

(Third embodiment)
A third embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 9 is a control system diagram based on the third embodiment of the present invention. In addition, about the thing which has the same structure as FIG. 1 thru | or FIG. 8, the same code | symbol is attached | subjected and description is abbreviate | omitted.

This embodiment is different in that the first current detector 27a of the first embodiment and the second current detector 27b of the second embodiment are installed in the circuit.

With reference to FIG. 9, the control operation by providing the second current detector 27b in the input power of the inverter unit and providing the first current detector 27a on the output side of the inverter unit 26 will be described below. To do.

The process from the new load activation (S1) to the operation (S5) for decreasing the output voltage and output frequency is the same as in the first embodiment.

Thereafter, as in the second embodiment, the input current is detected (S9), the rate of change of the input current is calculated (S10), and it is determined whether the calculated value exceeds a predetermined value β (S11). When the predetermined value β is exceeded, the occurrence of an inrush current is detected, and a command is issued from the inverter command generation unit 29e to the inverter unit 27 so that the output frequency and the output voltage are reduced (S12). The above is the description of the operation of the control system.

The auxiliary power unit as described above has a double control system structure that detects the starting current caused by a new load from the output current from the inverter unit and confirms that no inrush current has occurred even on the input current side. Therefore, it is possible to improve the control accuracy as compared with the first embodiment and the second embodiment, and it is possible to suppress the occurrence of an induction failure.

1 Overhead Line 2 Pantograph 3 First Auxiliary Power Supply Device 4 Second Auxiliary Power Supply Device 5 Contactor 6 Contactor 7 Changeover Switch 8 Load 9 Load 10 Load 10a Current Detector 10b Oil Pump 10c Blower 10d Brake Compressor 20 Auxiliary Power Supply Device 21 Contactor 22 Reactor 23 Filter Capacitor Charging Resistor 24 Filter Capacitor Charging Resistor Short-Circuit Switch 25 Filter Capacitor 26 Inverter 27a First Current Detector 27b Second Current Detector 28 Control Unit 29 Inductive Fault Prevention Unit 29a Variable Calculation Unit 29b Comparison unit 29c Output voltage control unit 29d Output frequency control unit 29e Inverter element signal generation unit 30 AC filter 31 Transformer 32 Load 32a First air conditioner 32b Second air conditioner 32c Third air conditioner 32d AC compressor 33 3 Crossover wire

Claims (3)

An inverter that converts the current to be supplied to the load mounted on the vehicle body by switching the semiconductor element;
An AC filter connected to the inverter unit and rectifying a current flowing from the inverter unit to a load;
A current detector installed between the inverter unit and the AC filter;
A calculation unit for calculating a rate of change of current based on a current value detected by the current detector;
A comparison unit that determines whether the rate of change calculated by the calculation unit exceeds a predetermined value;
When it is determined that the current change rate calculated by the comparison unit exceeds a predetermined value, an inductive failure prevention unit that reduces at least one of the output voltage and the output frequency of the inverter,
Auxiliary power supply apparatus characterized by comprising. A filter capacitor charging resistor that prevents a sudden flow of current from the overhead wire to the vehicle body; and
A filter capacitor charging resistor short-circuit switch connected in parallel with the filter capacitor charging resistor to create an ON state and an OFF state of the filter capacitor charging resistor switch;
An inverter unit that converts a current to be supplied to a load mounted on a vehicle body through switching of the semiconductor element through the filter capacitor charging resistor and the filter capacitor charging resistor short-circuit switch;
A current detector installed between the filter capacitor charging resistor and the inverter unit;
A calculation unit for calculating a rate of change of current based on a current value detected by the current detector;
A comparison unit that determines whether the rate of change calculated by the calculation unit exceeds a predetermined value;
When it is determined that the current change rate calculated by the comparison unit exceeds a predetermined value, an inductive failure prevention unit that reduces at least one of the output voltage and the output frequency of the inverter,
Auxiliary power supply apparatus characterized by comprising. In the inductive failure prevention unit, a plurality of predetermined values set by the comparison unit are provided, an output decrease pattern of the output voltage and output frequency of the inverter unit is set for each of the plurality of predetermined values, and the current change calculated by the calculation unit 3. The auxiliary power supply apparatus according to claim 1, wherein an output reduction pattern of the output voltage and the output frequency is determined based on a rate and the plurality of predetermined values.

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