CN110661331A - AC-DC converter - Google Patents
AC-DC converter Download PDFInfo
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- CN110661331A CN110661331A CN201810697492.2A CN201810697492A CN110661331A CN 110661331 A CN110661331 A CN 110661331A CN 201810697492 A CN201810697492 A CN 201810697492A CN 110661331 A CN110661331 A CN 110661331A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C17/00—Arrangement or disposition of parts; Details or accessories not otherwise provided for; Use of control gear and control systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention discloses an AC-DC converter, which comprises a converter main circuit and a control unit; the alternating current side of the converter main circuit is connected with an alternating current contact network and an alternating current load, and the direct current side of the converter main circuit is connected with a storage battery and a direct current load; the AC-DC converter is configured in such a way that when the pantograph-catenary of the railway vehicle is normal, the control unit controls the main circuit of the converter to draw power from the AC-DC catenary to perform AC-DC conversion so as to supply power for the DC load and charge the storage battery; when the pantograph of the railway vehicle is abnormal, the control unit controls the main circuit of the converter to draw power from the storage battery, perform direct-current and alternating-current conversion to supply power for an alternating-current load and supply power for a direct-current load. The problems of section blockage and line outage caused by the fact that the rail vehicle is stopped on the line for a long time to wait for rescue in the prior art are solved, power is supplied to loads such as an air conditioner, the problem that vehicle passengers experience badly at the moment can be improved, and operation experience is guaranteed.
Description
Technical Field
The invention belongs to the technical field of railway vehicles, and particularly relates to an alternating current-direct current converter.
Background
In the running process of the rail vehicle, due to bow net faults caused by natural disasters and the like, abnormal interruption of vehicle power supply can be caused, at the moment, a storage battery is often adopted as a power supply to maintain the power supply of a direct current load of the rail vehicle in the prior art, an alternating current load (such as a motor, an air conditioner and the like) is forced to stop working, and at the moment, the rail vehicle can only stop on a line to wait for rescue. And when serious, the method also causes interval blockage and line shutdown. When the environment temperature is bad and the waiting rescue time is too long, the operation experience can be greatly influenced.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide an ac-dc converter, which can release the energy of a storage battery connected to the ac converter when the power supply of a rail vehicle is interrupted abnormally, so as to maintain the ac load (such as a motor and an air conditioner) to work, thereby realizing the motor dragging or maintaining the operation of the air conditioner, and improving the operation experience.
In order to solve the above technical problem, an embodiment of the present application first provides an ac-dc converter, including a converter main circuit and a control unit; the alternating current side of the converter main circuit is connected with an alternating current contact network and an alternating current load, and the direct current side of the converter main circuit is connected with a storage battery and a direct current load; the ac-dc converter is configured such that,
when a pantograph-catenary of the railway vehicle is normal, the control unit controls the converter main circuit to draw power from the alternating-current catenary to perform alternating-current and direct-current conversion so as to supply power to the direct-current load and charge the storage battery;
when the pantograph of the railway vehicle is abnormal, the control unit controls the converter main circuit to draw power from the storage battery, perform direct-current and alternating-current conversion to supply power to the alternating-current load and supply power to the direct-current load.
Preferably, the converter main circuit comprises an alternating current interface module, an alternating current EMI filter, an alternating current filter capacitor module, a transformer, a current conversion module, a direct current filter module, a direct current EMI filter and a direct current interface module which are connected in sequence;
the alternating current interface module is used for realizing connection and disconnection between the alternating current-direct current converter and the alternating current load and fault isolation;
the alternating current EMI filter is used for suppressing high-frequency noise from an alternating current side or the inside of an alternating current-direct current converter;
the alternating current filter capacitor module is used for being matched with the transformer to realize low-pass filtering;
the transformer is used for realizing voltage adjustment together with the current transformation module during AC-DC conversion and realizing low-pass filtering together with the AC filter capacitor module during AC-DC conversion;
the converter module is used for realizing rectification during AC-DC conversion and realizing inversion during AC-DC conversion;
the direct current filtering module is used for realizing low-pass filtering and simultaneously realizing residual energy release;
the direct current EMI filter is used for suppressing high-frequency noise from the inside or the direct current side of the alternating current-direct current converter;
and the direct current interface module is used for realizing the communication and disconnection of the alternating current-direct current converter, the storage battery and the direct current load and fault isolation.
Preferably, the alternating current interface module comprises an alternating current short-circuit contactor, an alternating current charging contactor and an alternating current charging resistor;
one end of the alternating current short circuit contactor is connected with the alternating current contact net and the alternating current load, and the other end of the alternating current short circuit contactor is connected with the alternating current EMI filter;
and the alternating current charging contactor is connected with the alternating current charging resistor in series and then connected to two ends of the alternating current short-circuit contactor in parallel.
Preferably, the ac filter capacitor module includes a delta filter capacitor module or a star filter capacitor module.
Preferably, the high-voltage side coil and the low-voltage side coil of the transformer are connected in a star shape and a triangle shape respectively; the high-voltage side coil is provided with a lead-out center line and is used for supplying power to a single-phase alternating-current load when the three-phase alternating-current load is supplied with power.
Preferably, the current transformation module is a three-phase full-bridge circuit comprising six semiconductor switching devices;
the three-phase full-bridge circuit is correspondingly connected with the AC side positive end and the AC side negative end of the DC EMI filter through a middle DC positive line and a middle DC negative line respectively, and the DC filtering module is connected between the middle DC positive line and the middle DC negative line in parallel.
Preferably, the dc filter module includes a dc filter capacitor and a discharge resistor connected in parallel between the intermediate dc positive line and the intermediate dc negative line, respectively.
Preferably, the dc interface module includes a dc short-circuit contactor, a dc charging contactor, and a dc charging resistor;
one end of the direct current short-circuit contactor is connected with the direct current side positive end of the direct current EMI filter, and the other end of the direct current short-circuit contactor is respectively connected with the positive end of the direct current load and the positive end of the storage battery;
and the direct current charging contactor is connected with the direct current charging resistor in series and then connected to two ends of the direct current short-circuit contactor in parallel.
Preferably, the dc interface module further includes an anti-reverse diode;
and the anti-reverse diode is arranged between the other end of the direct current short-circuit contactor and the positive end of the storage battery and is used for preventing the direct current load from transmitting power to the storage battery reversely.
Preferably, the control unit comprises an alternating voltage detection module, an alternating current detection module, an alternating network voltage detection module, a direct current detection module, a battery voltage detection module, a battery current detection module, a controller and a driving module;
the alternating voltage detection module is used for detecting the alternating voltage to ground voltage on a line between the alternating current interface module and the alternating current EMI filter;
the alternating current detection module is used for detecting alternating current line current on a line between the alternating current interface module and the alternating current EMI filter;
the alternating current network voltage detection module is used for detecting the alternating current voltage to ground of an alternating current contact network;
the direct-current voltage detection module is used for detecting the voltage between the direct-current side positive end and the direct-current side negative end of the direct-current EMI filter;
the direct current detection module is used for detecting the current flowing through the direct current side positive end of the direct current EMI filter;
the battery voltage detection module is used for detecting the voltage between the positive end and the negative end of the storage battery;
the battery current detection module is used for detecting the charging current of the storage battery;
the controller is used for receiving the detection signals generated by the detection modules, generating switch control signals for driving the contactors to act based on the detection signals, and generating pulse signals for realizing the action of the semiconductor switching devices;
and the driving module is used for receiving the pulse signal and converting the pulse signal into a driving signal for driving the semiconductor switching device to act.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by adopting the AC-DC converter provided by the invention, when the railway pantograph is abnormal, the energy of the storage battery is released, the DC is converted into AC, and the three-phase AC load and the single-phase AC load are supplied with power, so that the problems of section blockage, line outage and poor passenger experience caused by long-time stop of the rail vehicle on the line for waiting for rescue in the prior art are avoided, and the operation experience is ensured.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
Fig. 1 is a schematic diagram of a configuration of an ac-dc converter according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a main circuit of an ac-dc converter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a control unit of the ac-dc converter according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating protection logic control when starting ac-dc conversion of the ac-dc converter according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating protection logic control when the ac-dc converter starts dc-ac conversion according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
As shown in fig. 1, the ac-dc converter of the present invention includes a converter main circuit 100 and a control unit 200;
the ac side of the converter main circuit 100 is connected to an ac catenary (not shown in the figure) and an ac load, and the dc side of the converter main circuit 100 is connected to a battery and a dc load; the ac-dc converter is configured such that,
when the pantograph-catenary of the railway vehicle is normal, the control unit 200 controls the converter main circuit 100 to draw power from an alternating-current catenary, so as to perform alternating-current and direct-current conversion, supply power for a direct-current load and charge a storage battery;
when the pantograph of the railway vehicle is abnormal, for example, the pantograph is abnormal due to outage of an overhead line caused by natural disasters, the control unit 200 controls the converter main circuit 100 to draw power from the storage battery, perform direct-current and alternating-current conversion to supply power for an alternating-current load and supply power for a direct-current load.
Specifically, as shown in fig. 1, the converter main circuit 100 includes an ac interface module 110, an ac EMI filter 120, an ac filter capacitor module 130, a transformer 140, an inverter module 150, a dc filter module 160, a dc EMI filter 170, and a dc interface module 180, which are connected in sequence;
the ac interface module 110 is used for realizing connection and disconnection between the ac-dc converter and an ac load and fault isolation;
an ac EMI filter 120 for suppressing high-frequency noise from the ac side or inside the ac-dc converter;
an ac filter capacitor module 130 for cooperating with a transformer 140 to achieve low pass filtering;
the transformer 140 is used for realizing transformation and electrical isolation, realizing voltage regulation together with the current transformation module during alternating current-direct current transformation, and realizing low-pass filtering together with the alternating current filter capacitor module 130 during direct current-alternating current transformation;
the converter module 150 is used for realizing rectification during AC-DC conversion and realizing inversion during AC-DC conversion;
a dc filtering module 160 for implementing low pass filtering and simultaneously implementing residual energy release;
a dc EMI filter 170 for suppressing high frequency noise from inside the ac-dc converter or from the dc side;
and the direct current interface module 180 is used for realizing the communication and disconnection between the alternating current-direct current converter and the storage battery and between the alternating current-direct current converter and the direct current load and fault isolation.
In a specific embodiment, as shown in FIG. 2, the AC interface module 110 includes an AC shorting contactor 111, an AC charging contactor 112, and AC charging resistors 113, 114, and 115. The ac interface module 110 can prevent the ac filter capacitor module 130 from being damaged by the inrush current during ac-dc conversion, and can reduce the impact of the ac-dc converter output on the external ac load during ac-dc conversion. In this embodiment, the ac side is a three-phase ac system, and the contactors in the ac interface module 110 are all three-phase.
The ac short-circuit contactor 111 has one end connected to the ac catenary and the ac load (point A, B, C in fig. 2), and the other end connected to the ac EMI filter 120 (points a1, B1, and C1 in fig. 2).
As shown in fig. 2, in this embodiment, each phase of the ac charging contactor 112 is connected in series with the ac charging resistors 113, 114, and 115, and then connected in parallel with the ac shorting contactor 111.
The ac EMI filter 120 is followed by an ac filter capacitor module 130, and according to different application scenarios, the ac filter capacitor module 130 includes a filter capacitor module in a delta connection method or a filter capacitor module in a star connection method, as shown in fig. 2, in this embodiment, the ac filter capacitor module 130 is a filter capacitor module in a delta connection method.
The ac filter capacitor module 130 is followed by a transformer 140, and in the present embodiment, the high-voltage side coil and the low-voltage side coil of the transformer 140 are connected in a star connection and a delta connection, respectively. And the high-side coil of the transformer 140 has a drawn neutral line (as shown in fig. 2 as N3-N2), which is connected to an external ac load through the ac EMI filter 120, for supplying power to a single-phase ac load when the power is supplied to a three-phase ac load. It will of course be appreciated that the outgoing neutral line could be eliminated without the requirement of a single phase ac load.
The low-voltage side of the transformer 140 is connected to a current transforming module 150, and in this embodiment, the current transforming module 150 is a three-phase full-bridge circuit including six semiconductor switching devices. The semiconductor switching devices 151 and 156 as shown in fig. 2 constitute a three-phase full bridge circuit as a current transforming module.
The three-phase full-bridge circuit is correspondingly connected with the AC side positive terminal and the AC side negative terminal of the DC EMI filter 170 respectively through the middle DC positive line (shown as D1-D2 in FIG. 2) and the middle DC negative line (shown as E1-E2 in FIG. 2), and the DC filtering module 160 is connected in parallel between the middle DC positive line and the middle DC negative line.
In this embodiment, the dc filter module 160 includes a dc filter capacitor 161 and a discharge resistor 162 connected in parallel between the intermediate dc positive line and the intermediate dc negative line, respectively.
As shown in fig. 2, the dc EMI filter 170 is followed by a dc interface module 180, in this embodiment, the dc interface module 180 includes a dc shorting contact 181, a dc charging contact 182, and a dc charging resistor 183, and the dc shorting contact 181 and the dc charging contact 182 are single-phase contacts.
One end of the dc short-circuit contactor 181 is connected to the dc positive terminal of the dc EMI filter 170 (i.e., at point D3 in fig. 2), and the other end is connected to the positive terminal of the dc load (at point D5) and the positive terminal of the battery (at point D4), respectively; the dc charging contactor 182 is connected in series with the dc charging resistor 183 and then connected in parallel to two ends of the dc shorting contactor 181.
The dc interface module 180 suppresses the charging current of the battery during ac/dc conversion, widens the output voltage range of the ac/dc converter, and prevents the dc filter capacitor 161 from being damaged by the start-up inrush current during ac/dc conversion.
Further, the dc interface module 180 further includes an anti-reverse diode 184; the anti-reverse diode 184 is arranged between the other end of the direct current short circuit contactor and the positive end (point D4) of the storage battery, and is used for preventing the direct current load from transmitting power reversely to the storage battery, so that the direct current load can be normally maintained to supply power no matter the alternating current-direct current converter works in alternating current-direct current conversion or direct current-alternating current conversion.
As shown in fig. 3, the control unit 200 in this embodiment includes an ac voltage detection module 210, an ac current detection module 220, an ac network voltage detection module 230, a dc voltage detection module 240, a dc current detection module 250, a battery voltage detection module 260, a battery current detection module 270, a controller 280, and a driving module 290;
an ac voltage detection module 210, configured to detect an ac-to-ground voltage on a line between the ac interface module 110 and the ac EMI filter 120, that is, voltages at points a1, B1, C1 and N1 in fig. 2;
an ac current detection module 220, configured to detect an ac line current on a line between the ac interface module 110 and the ac EMI filter 120, specifically, a line current of three phases a1, B1, and C1 in fig. 2;
an ac network voltage detection module 230, configured to detect an ac voltage to ground of an ac contact network, that is, a voltage corresponding to A, B, C point to N point in fig. 2;
a dc voltage detecting module 240, configured to detect a voltage between a dc side positive terminal and a dc side negative terminal of the dc EMI filter, specifically a voltage at a point D3 to a point E3 in fig. 2;
a dc current detection module 250, configured to detect a current flowing through the dc side positive terminal of the dc EMI filter, that is, a current flowing through a point D3 in fig. 2;
a battery voltage detection module 260 for detecting a voltage between the positive and negative terminals of the secondary battery, i.e., a terminal voltage of the battery;
a battery current detection module 270 for detecting a charging current of the secondary battery, that is, a current flowing through a point D4 in fig. 2 when charging;
a controller 280 for receiving the detection signals generated by the detection modules, generating switching control signals for driving the contactors to operate, and generating pulse signals for implementing the semiconductor switching device to operate, based on the detection signals; and the driving module 290 is configured to receive the pulse signal and convert the pulse signal into a driving signal for driving the semiconductor switching device to operate.
The invention relates to an AC-DC converter, belonging to a part of a rail vehicle control system, wherein the rail vehicle control system provides a state quantity for the AC-DC converter to indicate whether a railway vehicle pantograph is normal or abnormal, and a controller of the AC-DC converter controls the AC-DC converter to carry out AC-DC conversion or DC-AC conversion according to the state quantity.
The control flow of the protection logic when the ac-dc converter starts the ac-dc conversion and the dc-ac conversion will be briefly described with reference to fig. 4 and 5.
Fig. 4 is a schematic diagram of a protection logic flow when the ac-dc converter starts ac conversion into dc conversion.
Firstly, detecting whether the AC network voltage meets a set threshold value, and if not, outputting a corresponding protection logic signal to quit the subsequent process of not carrying out AC-DC conversion control; if the two-dimensional data match,
continuously detecting whether the alternating current meets a set threshold value, and if the alternating current does not meet the set threshold value, outputting a corresponding protection logic signal, and exiting the subsequent process without performing alternating current-direct current conversion control; if the two-dimensional data match,
continuing to control the alternating current charging contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process without alternating current-direct current conversion control; if the control result is normal, the control method comprises the following steps,
continuing to control the AC short-circuit contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process without AC-DC conversion control; if the control result is normal, the control method comprises the following steps,
continuing to carry out the rectification control of the converter unit, if the control result is abnormal, outputting a corresponding protection logic signal, and exiting the subsequent process without AC-DC conversion control; if the control result is normal, the control method comprises the following steps,
continuing to control the direct-current charging contact, if the control result is abnormal, outputting a corresponding protection logic signal, and quitting the subsequent process without performing alternating-current-direct-current conversion control; if the control result is normal, the control method comprises the following steps,
continuing to control the direct-current short-circuit contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process without performing alternating-current and direct-current conversion control; if the control result is normal, the control method comprises the following steps,
continuing to detect the direct-current voltage, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process without performing alternating-current and direct-current conversion control; if the detection result is normal,
continuing to detect the direct current, if the detection result is abnormal, outputting a corresponding protection logic signal, and exiting the subsequent process without performing AC-DC conversion control; if the detection result is normal,
continuing to detect the voltage of the battery, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process without AC-DC conversion control; if the detection result is normal,
continuing to detect the current (charging current) of the battery, if the detection result is abnormal, outputting a corresponding protection logic signal, and exiting the subsequent process without AC-DC conversion control; if the control result is normal, entering a normal AC-DC conversion working state.
Fig. 5 is a schematic diagram of a protection logic flow when the ac-dc converter starts dc conversion into ac. Similar to fig. 4, the protection logic determination is performed from the dc side only, and is not described in detail here.
When the pantograph net of the railway vehicle is normal, the AC-DC converter provided by the invention draws power from the AC contact net to perform AC-DC conversion, supplies power for a DC load and charges a storage battery. When the railway pantograph is abnormal, the storage battery is discharged, direct current is converted into alternating current, and power is supplied to a three-phase alternating current load and a single-phase alternating current load, for example, short-time emergency power supply is provided for a motor, an air conditioner and the like, so that the rail vehicle can leave an operation line by itself, the problems of section blockage and line shutdown caused by the fact that the rail vehicle stops on the line for a long time to wait for rescue in the prior art are solved, the power is supplied to the loads such as the air conditioner and the like, the problem of poor experience of vehicle passengers at the moment can be improved, and the operation experience is guaranteed.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An AC-DC converter comprises a converter main circuit and a control unit; the alternating current side of the converter main circuit is connected with an alternating current contact network and an alternating current load, and the direct current side of the converter main circuit is connected with a storage battery and a direct current load; the ac-dc converter is configured such that,
when a pantograph-catenary of the railway vehicle is normal, the control unit controls the converter main circuit to draw power from the alternating-current catenary to perform alternating-current and direct-current conversion so as to supply power to the direct-current load and charge the storage battery;
when the pantograph of the railway vehicle is abnormal, the control unit controls the converter main circuit to draw power from the storage battery, perform direct-current and alternating-current conversion to supply power to the alternating-current load and supply power to the direct-current load.
2. The AC-DC converter according to claim 1, wherein the converter main circuit comprises an AC interface module, an AC EMI filter, an AC filter capacitor module, a transformer, a converter module, a DC filter module, a DC EMI filter and a DC interface module which are connected in sequence;
the alternating current interface module is used for realizing connection and disconnection between the alternating current-direct current converter and the alternating current load and fault isolation;
the alternating current EMI filter is used for suppressing high-frequency noise from an alternating current side or the inside of an alternating current-direct current converter;
the alternating current filter capacitor module is used for being matched with the transformer to realize low-pass filtering;
the transformer is used for realizing voltage adjustment together with the current transformation module during AC-DC conversion and realizing low-pass filtering together with the AC filter capacitor module during AC-DC conversion;
the converter module is used for realizing rectification during AC-DC conversion and realizing inversion during AC-DC conversion;
the direct current filtering module is used for realizing low-pass filtering and simultaneously realizing residual energy release;
the direct current EMI filter is used for suppressing high-frequency noise from the inside or the direct current side of the alternating current-direct current converter;
and the direct current interface module is used for realizing the communication and disconnection of the alternating current-direct current converter, the storage battery and the direct current load and fault isolation.
3. The ac-dc converter of claim 2, wherein the ac interface module includes an ac shorting contactor, an ac charging contactor, and an ac charging resistor;
one end of the alternating current short circuit contactor is connected with the alternating current contact net and the alternating current load, and the other end of the alternating current short circuit contactor is connected with the alternating current EMI filter;
and the alternating current charging contactor is connected with the alternating current charging resistor in series and then connected to two ends of the alternating current short-circuit contactor in parallel.
4. The AC-DC converter according to claim 3, wherein the AC filter capacitor module comprises a delta filter capacitor module or a star filter capacitor module.
5. The AC-DC converter according to claim 4, wherein the high-side coil and the low-side coil of the transformer are connected in star and delta connection respectively; the high-voltage side coil is provided with a lead-out center line and is used for supplying power to a single-phase alternating-current load when the three-phase alternating-current load is supplied with power.
6. The AC-DC converter according to claim 5, wherein the converter module is a three-phase full bridge circuit comprising six semiconductor switching devices;
the three-phase full-bridge circuit is correspondingly connected with the AC side positive end and the AC side negative end of the DC EMI filter through a middle DC positive line and a middle DC negative line respectively, and the DC filtering module is connected between the middle DC positive line and the middle DC negative line in parallel.
7. The AC-DC converter according to claim 6, wherein the DC filter module comprises a DC filter capacitor and a discharge resistor connected in parallel between the intermediate DC positive line and the intermediate DC negative line, respectively.
8. The AC-DC converter according to claim 7, wherein the DC interface module comprises a DC shorting contactor, a DC charging contactor, and a DC charging resistor;
one end of the direct current short-circuit contactor is connected with the direct current side positive end of the direct current EMI filter, and the other end of the direct current short-circuit contactor is respectively connected with the positive end of the direct current load and the positive end of the storage battery;
and the direct current charging contactor is connected with the direct current charging resistor in series and then connected to two ends of the direct current short-circuit contactor in parallel.
9. The ac-dc converter of claim 8, wherein the dc interface module further comprises an anti-reverse diode;
and the anti-reverse diode is arranged between the other end of the direct current short-circuit contactor and the positive end of the storage battery and is used for preventing the direct current load from transmitting power to the storage battery reversely.
10. The ac-dc converter according to claim 9, wherein the control unit comprises an ac voltage detection module, an ac current detection module, an ac grid voltage detection module, a dc current detection module, a battery voltage detection module, a battery current detection module, a controller, and a driving module;
the alternating voltage detection module is used for detecting the alternating voltage to ground voltage on a line between the alternating current interface module and the alternating current EMI filter;
the alternating current detection module is used for detecting alternating current line current on a line between the alternating current interface module and the alternating current EMI filter;
the alternating current network voltage detection module is used for detecting the alternating current voltage to ground of an alternating current contact network;
the direct-current voltage detection module is used for detecting the voltage between the direct-current side positive end and the direct-current side negative end of the direct-current EMI filter;
the direct current detection module is used for detecting the current flowing through the direct current side positive end of the direct current EMI filter;
the battery voltage detection module is used for detecting the voltage between the positive end and the negative end of the storage battery;
the battery current detection module is used for detecting the charging current of the storage battery;
the controller is used for receiving the detection signals generated by the detection modules, generating switch control signals for driving the contactors to act based on the detection signals, and generating pulse signals for realizing the action of the semiconductor switching devices;
and the driving module is used for receiving the pulse signal and converting the pulse signal into a driving signal for driving the semiconductor switching device to act.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810697492.2A CN110661331B (en) | 2018-06-29 | 2018-06-29 | AC-DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810697492.2A CN110661331B (en) | 2018-06-29 | 2018-06-29 | AC-DC converter |
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| CN110661331A true CN110661331A (en) | 2020-01-07 |
| CN110661331B CN110661331B (en) | 2023-06-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111546909A (en) * | 2020-06-09 | 2020-08-18 | 南京铁道职业技术学院 | Transmission facility for subway |
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| CN107128183A (en) * | 2017-05-22 | 2017-09-05 | 中国铁道科学研究院 | A kind of electric EMU is met an urgent need tractive power supply system |
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| CN105024582A (en) * | 2015-07-27 | 2015-11-04 | 江苏大学 | Novel two-stage bidirectional energy storage converter control system and control method thereof |
| EP3252937A1 (en) * | 2016-06-03 | 2017-12-06 | Fronius International GmbH | Inverter and method for operating an inverter |
| CN205836553U (en) * | 2016-07-26 | 2016-12-28 | 株洲中车时代电气股份有限公司 | A kind of power supply system of train |
| CN107097648A (en) * | 2017-04-28 | 2017-08-29 | 陕西铁路工程职业技术学院 | A kind of rail truck powered by wind energy system |
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| CN111546909A (en) * | 2020-06-09 | 2020-08-18 | 南京铁道职业技术学院 | Transmission facility for subway |
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| CN110661331B (en) | 2023-06-13 |
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