KR102062018B1 - Control circuit of siv for rail vehicle and method - Google Patents

Abstract

The present invention relates to a control circuit and a method of an auxiliary power supply device for a railway vehicle, and more particularly, by switching the inverter with reference to the load current value and the temperature value by detecting the load current and the temperature of the inverter output through the auxiliary power supply device. The present invention relates to a control circuit and a method of an auxiliary power supply device for a railway vehicle that can reduce temperature rise and noise generation by controlling the power supply.
The control circuit of the auxiliary power supply device for a railway vehicle according to an embodiment of the present invention, the filter capacitor for charging the input DC voltage to supply the charged voltage to the inverter, and the charging voltage supplied from the filter capacitor to a desired level by the switching operation An inverter for converting and outputting an AC voltage to a AC voltage; a transformer for converting the AC voltage into another AC voltage and supplying the load; an AC current meter for measuring and outputting an AC current flowing from the transformer to the load; Controlling the switching operation of the inverter, it is configured to include a controller for controlling the switching operation of the switching element constituting the inverter by varying the frequency in accordance with the load AC current value sent from the AC current meter.

Description

Control Circuit and Method of Auxiliary Power Supply for Railway Vehicles {CONTROL CIRCUIT OF SIV FOR RAIL VEHICLE AND METHOD}

The present invention relates to a control circuit and a method of an auxiliary power supply device for a railway vehicle, and more particularly, by switching the inverter with reference to the load current value and the temperature value by sensing the load current and the temperature of the inverter output through the auxiliary power supply device. The present invention relates to a control circuit and a method of an auxiliary power supply for a railway vehicle that can reduce temperature rise and noise generation by controlling the power supply.

In general, a railway vehicle is provided with a main power supply and an auxiliary power supply, and the main power supply is mainly used to tow a train, and the auxiliary power supply supplies power to equipment not directly related to driving of the train, such as other fluorescent lamps.

In other words, the SIV (Static Inverter) of the railway vehicle is a device for supplying power to the various service equipment for the passenger service mainly provided in the railway vehicle.

This auxiliary power supply receives direct and alternating current power supplied through wire or peripheral voltage and converts it into three-phase AC power of constant voltage and constant frequency through the internal inverter circuit and supplies it to the control circuit, lighting device, and heating / heating device of the train. .

The conventional auxiliary power supply rectifies the input AC voltage by a rectifier to generate a DC voltage, and generates the DC voltage again, for example, an AC 630V voltage through a switching operation control of the inverter.

The AC 630V voltage generated in this way is input to the transformer after removing noise through LC filter, and it is transformed into AC 380V or AC 440V, for example, and supplies the output voltage of AC 380V or AC 440V to various service devices. .

The control method of the auxiliary power supply device for a railway vehicle is described below with reference to FIG. 1.

1 is a block diagram illustrating a control method of a conventional auxiliary power supply.

As illustrated, the auxiliary power supply (SIV) includes a filter capacitor (FC), an inverter (IV), an AC reactor (ACL), a transformer (TR), an AC current meter (ACCT), and a controller 10.

The filter capacitor FC charges the input DC voltage and supplies the charged voltage to the inverter IV.

The inverter IV generates and outputs an AC voltage having a desired level, for example, AC 630V, by controlling switching operation from the controller 10.

AC reactor improves distortion by removing noise of AC 630V which is output voltage.

The transformer (TR) transforms the AC 630V with improved distortion to AC 380V or AC 440V and supplies the load to various service devices.

As described above, the controller 10 controls the switching operation of the inverter IV while the auxiliary power supply SIV is operating. In the related art, the controller 10 controls the switching operation of the inverter IV at a constant frequency at all times. It was.

Therefore, when the switching of the inverter IV is constantly switched at a high frequency of 5 KHz or more, there is a great effect on noise suppression, but high heat generation occurs in the inverter IV.

In order to solve this high heat generation, the size of the heat sink can be increased, but there was a problem in that weight and product cost increased.

In addition, when the switching of the inverter IV is constantly switched to a low frequency of 1 KHz or less, there is a problem that it is difficult to reduce the noise generated by the AC reactor or the transformer TR as a noise source.

Publication No.2000-0025964 (06 May 2000)

The present invention has been made to solve the above problems, by detecting the load current and the temperature of the inverter output through the auxiliary power supply by controlling the switching of the inverter with reference to the load current value and the temperature value, the temperature of the inverter It is an object of the present invention to provide a control circuit and method for an auxiliary power supply for a railway vehicle that can reduce the generation of noise of the rising and alternating current reactors or transformers.

In order to achieve the above object, a control circuit of an auxiliary power supply for a railway vehicle according to an embodiment of the present invention includes: a filter capacitor which charges an input DC voltage and supplies a charged voltage to an inverter;

An inverter for converting the charging voltage supplied from the filter capacitor into an AC voltage having a desired level by a switching operation;

An LC filter unit filtering the AC voltage output from the inverter to improve distortion;

A transformer for converting the filtered AC voltage into another AC voltage and supplying it to a load;

An AC current measuring unit measuring the AC current flowing from the transformer to the load and outputting the measured current to the controller; And

A controller which controls the switching operation of the inverter, and controls the switching operation of the switching element constituting the inverter by varying the frequency according to the load AC current value sent from the AC current meter;

It is configured to include.

In addition, the controller compares the load AC current value with the reference current value and controls the switching operation at a low frequency of 1 KHz or less when the load AC current value is large,

When the load AC current value is small, the switching operation is controlled at a high frequency of 5KHz or more.

In addition, the inverter is connected to the input DC DC voltage in parallel with the first switching unit consisting of the first and second switching elements to switch the U phase,

A second switching unit comprising third and fourth switching elements connected in parallel with the first switching unit to switch V phases;

It is made of a third switching unit consisting of fifth and six switching elements connected in parallel with the second switching unit to switch the W phase,

The first, second, third switching unit is characterized in that the temperature sensor for measuring the temperature of the inverter is provided respectively.

In addition, the controller is characterized by controlling the switching operation of the switching device constituting the inverter by varying the frequency in accordance with the inverter temperature value sent from the temperature sensor.

The front end of the filter capacitor is connected to the input DC voltage and the other end of the line switch is connected to the filter capacitor and the filter capacitor,

A charge switch connected at one end to the input DC voltage and one end of the line switch and the other end connected to one end of the charge resistor;

A charging resistor connected to the other end of the line switch and the other end thereof;

One end is connected to the other end of the line switch and the other end is characterized in that the filter reactor is connected to the inverter.

In addition, the control method of the auxiliary vehicle power supply for railway vehicles according to an embodiment of the present invention, the load AC current value is classified into two levels by comparing the preset reference value, and the frequency to switch according to the level is specified and stored in the controller Doing;

The AC power is supplied to the auxiliary power supply through charging, AC conversion, filtering, and transformer transformation. The AC current is output to the load, and the magnitude of the AC current flowing from the AC current meter to the load is measured and output to the controller. Doing;

Comparing the load AC current value with a reference current value in the controller;

Controlling to switch the switching element of the inverter at a first low frequency when the reference current value is larger than the reference current value; And

Controlling the switching element of the inverter to a first high frequency when the load AC current value is small;

It is configured to include.

The first low frequency is 1 KHz or less, and the first high frequency is 5 KHz or more.

And measuring the temperature of the inverter in the temperature sensor provided in the inverter and outputting to the controller;

Comparing the inverter temperature value with a reference temperature value in the controller;

Controlling the switching element to be switched at a frequency lower than the first low frequency or the first high frequency when the inverter temperature value is greater than a reference temperature value;

Characterized in further performing.

According to the above-mentioned means for solving the problem, by detecting the load current and the temperature of the inverter output through the auxiliary power supply and controlling the switching of the inverter with reference to the load current value and the temperature value, to prevent the rise of the temperature of the inverter and the heat sink It can reduce the size, weight, and cost, and reduce the noise of AC reactor or transformer which is a noise source.

1 is a block diagram illustrating a control method of a conventional auxiliary power supply.
2 is a circuit diagram illustrating a control method of an auxiliary power supply apparatus according to the present invention.
3 is a flowchart illustrating a control method of an auxiliary power supply apparatus according to the present invention.

Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.

It should be noted that the same elements among the drawings are denoted by the same reference numerals and symbols as much as possible even though they are shown in different drawings.

In the following description of the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

2 is a circuit diagram illustrating a control method of an auxiliary power supply apparatus according to the present invention.

As shown, the auxiliary power supply includes a line switch (LK), a charge switch (CHK), a charge resistor (CHR), a filter reactor (FL), a DC voltage meter (DCPT), a filter capacitor current meter (FCCT), and a filter capacitor ( FC), discharge resistor (DSR), inverter (IV), AC reactor (ACL), AC capacitor (ACC), transformer (TR), AC voltage meter (ACPT), AC current meter (ACCT) and controller 10 It is configured to include.

One end of the line switch LK is connected to the input DC voltage, and the other end of the line switch LK is connected to the filter capacitor FC and the discharge resistor DSR through the filter reactor FL and the filter capacitor current meter FCCT described later. )

One end of the charging switch CHK is commonly connected to the input DC voltage and one end of the line switch LK, and the other end of the charging switch CHK is connected to one end of the charging resistor CHR, and the other end of the charging resistor CHR is It is connected to the other end of the line switch LK.

One end of the filter reactor FL is connected to the other end of the line switch LK, and the other end of the filter reactor FL is connected to an inverter IV that converts an input DC voltage into an AC voltage.

One end of the filter capacitor FC is connected to the other end of the filter reactor FL via the filter capacitor current meter FCCT, and the other end of the filter capacitor FC is connected to the ground line and charged and charged by the input voltage. To supply the inverter IV.

One end of the DC voltage meter (DCPT) is connected to the other end of the line switch (LK) and the other end of the DC voltage meter (DCPT) is connected to the ground line to measure the input voltage.

One end of the filter capacitor current meter FCCT is connected to the other end of the line switch LK, and the other end of the filter capacitor current meter FCFC is connected to the ground line through the filter capacitor FC to flow through the filter capacitor FC. Is measured and output to the controller 10.

The discharge resistor DSR is connected in parallel with the filter capacitor FC to discharge the charged voltage.

Inverter IV converting an input DC voltage into an AC voltage includes a first switching unit IM1 consisting of switching elements U1 and U2 connected in parallel to the input DC voltage so that the U phase is switched, and the first switching unit. A switching element such that the second switching unit IM2 includes switching elements V1 and V2 connected in parallel with IM1 in parallel to switch the V phase, and the W phase is connected in parallel with the second switching unit IM2 in parallel. Comprising a third switching unit (IM3) consisting of (W1, W2), each of the switching unit (IM1, IM2, IM3) is provided with a temperature sensor (TH), respectively, after measuring the temperature provided to the controller 10 do.

In addition, each of the switching units IM1, IM2, and IM3 includes a gate drive IDU and a clamp capacitor.

An L-C filter circuit is connected to an output terminal of the inverter IV. A filter circuit of an AC reactor and an AC capacitor is connected to improve the distortion of the output.

For example, the transformer TR connected to the output terminal of the inverter IV converts an AC 630V output from the inverter 10 into an AC 380V or an AC 440V to convert an output voltage of an AC 380V or an AC 440V into various service devices (loads). Supplies).

The AC voltage measurer ACPT senses an AC voltage output from the transformer TR and provides the same to the controller 10 so that a constant AC voltage is always output.

The AC current measuring device ACCT is output to the transformer TR to measure the AC current flowing through the load and provide the same to the controller 10.

The controller 10 converts the switching frequency of the switching elements U1, U2, V1, V2, W1, W2 constituting each of the switching units IM1, IM2, IM3 of the inverter IV into an AC current. It is controlled by varying the load AC current value provided by ACCT.

Particularly, in the present invention, the level of the measured AC current value is classified into N according to the magnitude of the AC current value, and the frequency to be switched is designated differently according to the classified level and stored in the controller 10.

In addition, the controller 10 may classify N levels of inverter temperature values provided to the temperature sensors TH included in each of the switching units IM1, IM2, and IM3, and specify different switching frequencies according to the classified levels. Store in

Here, an example is described in which the level of the load AC current value or the inverter temperature value is larger or smaller than the reference value, and the switching is performed at low frequency or high frequency according to the divided load AC current value or the inverter temperature value.

Referring to the operation of the above-described configuration, first, the charging switch CHK is turned on to input the input DC voltage through the charging switch CHK, the charging resistor CHR, the filter reactor FL, and the filter capacitor current meter FCCT. Charge the filter capacitor (FC).

In this process, the voltage charged to the filter capacitor FC has a gentle slope due to the RC time constant based on the resistance value of the charging resistor CHR and the capacitance of the filter capacitor FC.

Next, when the voltage charged in the filter capacitor FC is greater than or equal to a predetermined voltage (for example, 450 V), the line switch LK is turned on to convert the input DC voltage into the line switch LK, the filter reactor FL, and the filter. The capacitor capacitor (FCCT) is charged to the filter capacitor (FC).

Accordingly, there is an effect that a sudden change in the voltage charged in the filter capacitor FC is prevented.

The inverter IV converts the DC charging voltage charged in the filter capacitor FC into an AC voltage by switching control of the controller 10 to be described later, and the AC reactor ACL and the AC capacitor ACC are inverters. Filter the AC voltage from IV), and the transformer TR converts the filtered AC voltage into the required magnitude and outputs it to the load.

On the other hand, when there is no need for further power supply, such as driving termination, the voltage charged in the filter capacitor FC by turning off the line switch LK and the charging switch CHK and turning on the discharge switch DSK (not shown). Is discharged through the discharge resistor (DSR).

In this process, the temperature sensor TH of the switching units IM1, IM2, and IM3 measures the temperature of the inverter and outputs it to the controller 10. The AC current meter ACCT measures the load AC current output to the load. The controller 10 outputs a frequency to switch the switching elements (U1, U2), (V1, V2), and (W1, W2) according to the inverter temperature value and the load AC current value. Variable.

Unexplained symbol SIVK is a magnetic contactor for load connection and disconnection of output terminal of auxiliary power supply (SIV).

3 is a flowchart illustrating a control method of an auxiliary power supply apparatus according to the present invention.

First, the load AC current value and the inverter temperature value are classified into N levels according to their sizes, and the frequencies for switching the switching elements are stored in the controller 10 according to the classified levels.

Here, an example will be described in which a reference value is preset and the level is divided into two according to whether the reference value is greater than or less than the reference value, and two frequencies to be switched are stored.

In this state, when power is supplied to the auxiliary power supply (SIV) as shown in FIG. 3 (S302), the charging of the filter capacitor FC, the AC conversion of the inverter IV, the AC reactor ACL and the AC capacitor While filtering (ACC) and transforming the transformer (TR), an AC current is output to the load (S304).

At this time, the AC current measured by the transformer (TR) connected between the transformer (TR) and the load is measured in the transformer (TR) and flows to the load (load AC current value) and outputs to the controller 10 (S308). .

The controller 10 compares the load AC current value with the reference current value (S310), and when the load AC value is larger than the reference current value, the load current flows a lot to form the switching elements (U1 and U2) and ( It is determined that the temperatures of V1, V2) and (W1, W2) are high, and control to switch the switching element to the first low frequency of 1 KHz or less (S312).

In addition, when the load AC current value is smaller than the reference current value, the load current flows less, and it is determined that noise is generated in the AC reactor or transformer TR, which is a noise source, and the switching device is operated at a first high frequency of 5 KHz or higher. Control to switch (S314).

The temperature of the inverter IV may increase due to the first low frequency or the first high frequency switching control of the switching element according to the load AC current value as described above. The temperature sensor (TH) provided in the) measures the temperature of each switching unit and outputs to the controller 10 (S316).

When the controller 10 compares the inverter temperature value with a preset reference temperature value and is greater than the reference temperature value, when the controller 10 switches to the first low frequency in order to further reduce the temperature of the switching device, the controller 10 operates at a frequency lower than the first low frequency. When switching to the first high frequency, it is controlled to switch the switching element at a frequency lower than the first high frequency.

As described above, according to the present invention, when a large load current flows through the transformer TR, the switching element of the inverter IV is switched to the first low frequency, and the inverter IV is also switched to the first low frequency. When the temperature is high, heat generation of the switching device can be reduced by controlling the switching device at a lower frequency than the first low frequency, and the size, weight, and cost of the heat sink can be reduced.

In addition, when the load current flows less through the transformer TR, the switching element of the inverter IV is switched to the first high frequency, and when the temperature of the inverter is increased by switching to the first high frequency, the frequency is lower than the first high frequency. By controlling the switching element, it is possible to reduce noise generated in the AC reactor ACL and the transformer TR, which are the address sound sources, and to reduce the heat generation of the switching element.

Although the technical spirit of the present invention has been described above with reference to the accompanying drawings, the present invention has been described by way of example and is not intended to limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

10: Controller ACCT: AC Current Meter
ACL: AC Reactor FC: Filter Capacitor
IM1, IM2, IM2: Switching Unit IV: Inverter
TR: Transformer U1, U2, V1, V2, W1, W2: Switching element

Claims (8)

delete delete delete delete delete Comparing the load AC current value with a predetermined reference value and classifying the level into two, and designating and storing the frequency to be switched according to the level in the controller;
The AC power is supplied to the auxiliary power supply through charging, AC conversion, filtering, and transformer transformation. The AC current is output to the load, and the AC current flowing from the AC current meter to the load is measured and output to the controller. Making;
Comparing the load AC current value with a reference current value in the controller;
Controlling to switch the switching element of the inverter at a first low frequency when the reference current value is larger than the reference current value; And
Controlling switching of the switching element of the inverter at a first high frequency when the load AC current value is small;
Control method of the auxiliary power device for a railway vehicle comprising a. The method of claim 6,
The first low frequency is less than 1KHz, the first high frequency is a control method of the auxiliary power supply for a railway vehicle, characterized in that more than 5KHz. The method according to claim 6 or 7,
Measuring the temperature of the inverter in the temperature sensor provided in the inverter and outputting it to the controller;
Comparing the inverter temperature value with a reference temperature value in the controller;
Controlling the switching device to switch at a frequency lower than the first low frequency or the first high frequency when the inverter temperature value is greater than a reference temperature value;
Control method of the auxiliary power supply for railway vehicles, characterized in that further performing.

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