CN110661331B - AC-DC converter - Google Patents
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- CN110661331B CN110661331B CN201810697492.2A CN201810697492A CN110661331B CN 110661331 B CN110661331 B CN 110661331B CN 201810697492 A CN201810697492 A CN 201810697492A CN 110661331 B CN110661331 B CN 110661331B
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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
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- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses an AC-DC converter, which comprises a converter main circuit and a control unit; the alternating current side of the main circuit of the converter is connected with an alternating current contact net and an alternating current load, and the direct current side of the main circuit of the converter is connected with a storage battery and a direct current load; the AC-DC converter is configured to control the main circuit of the converter to conduct AC-DC conversion from the AC contact net to supply power to the DC load and charge the storage battery when the bow net of the railway vehicle is normal; when the bow net of the railway vehicle is abnormal, the control unit controls the main circuit of the converter to conduct electricity from the storage battery, conduct direct-to-alternating-current conversion to supply power for the alternating-current load and supply power for the direct-current load. The problem that a railway vehicle is stopped for a long time on a line to wait for rescue, and the section is blocked and the line is stopped due to the fact that the railway vehicle is stopped for a long time in the prior art is avoided, and the railway vehicle is used for supplying power to loads such as an air conditioner, so that the problem that the experience of passengers of the railway vehicle is poor at the moment can be solved, and the 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, the power supply of the vehicle is abnormally interrupted due to the bow net fault caused by natural disasters and the like, at the moment, a storage battery is often adopted as a power supply in the prior art to maintain the direct-current load power supply of the rail vehicle, the 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 in severe cases, the block and the line stop are caused. When the environment temperature is bad and the waiting time is too long, the operation experience can be greatly influenced.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide an AC-DC converter which can release the energy of a storage battery connected with the AC-DC converter when the power supply of a railway vehicle is interrupted abnormally, and maintain the work of an AC load (such as a motor, an air conditioner and the like), thereby realizing the dragging of the motor or the operation of the air conditioner, and improving the operation experience.
In order to solve the above technical problems, 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 net 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 the bow net of the railway vehicle is normal, the control unit controls the main circuit of the converter to conduct power from the alternating current contact net and conduct alternating current-direct current conversion so as to supply power for the direct current load and charge the storage battery;
when the bow net of the railway vehicle is abnormal, the control unit controls the main circuit of the converter to conduct electricity from the storage battery, conduct direct-to-alternating-current conversion to supply power for the alternating-current load and supply power for the direct-current load.
Preferably, the main circuit of the converter comprises an alternating current interface module, an alternating current EMI filter, an alternating current filter capacitor module, a transformer, a converter 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 the communication and breaking of 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 the alternating-current side or the inside of the alternating-current-to-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 jointly realizing voltage adjustment with the current transformation module during AC/DC conversion and jointly realizing low-pass filtering 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 DC-AC 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 of the alternating-current/direct-current converter or the direct-current side;
and the direct current interface module is used for realizing the connection and disconnection between the alternating current-direct current converter and the storage battery as well as the direct current load and fault isolation.
Preferably, 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;
the alternating-current charging contactor is connected with the alternating-current charging resistor in series and then connected with the two ends of the alternating-current short-circuit contactor in parallel.
Preferably, the ac filter capacitor module includes a delta-connected filter capacitor module or a star-connected filter capacitor module.
Preferably, the high-voltage side coil and the low-voltage side coil of the transformer are respectively in star connection and delta connection; the high-voltage side coil is provided with an outgoing center line and is used for supplying power to the single-phase alternating current load when supplying power to the three-phase alternating current load.
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 alternating-current side positive end and the alternating-current side negative end of the direct-current EMI filter through a middle direct-current positive line and a middle direct-current negative line respectively, and the direct-current filtering module is connected between the middle direct-current positive line and the middle direct-current negative line in parallel.
Preferably, the direct current filtering module comprises a direct current filtering capacitor and a discharging resistor which are respectively connected in parallel between the middle direct current positive line and the middle direct current negative line.
Preferably, the direct current interface module comprises a direct current short circuit contactor, a direct current charging contactor and a direct current 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;
the direct-current charging contactor is connected with the direct-current charging resistor in series and then connected with the two ends of the direct-current short-circuit contactor in parallel.
Preferably, the direct current interface module further comprises an anti-reflection diode;
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 used for preventing the direct current load from reversely transmitting electricity to the storage battery.
Preferably, the control unit comprises an alternating current voltage detection module, an alternating current 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 current voltage detection module is used for detecting alternating current 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 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 alternating current ground voltage 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 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 operate based on the detection signals, and generating pulse signals for realizing the operation 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.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
when the AC-DC converter provided by the invention is adopted, when the railway bow net is abnormal, the energy of the storage battery is released, the direct current is converted into alternating current, and the three-phase alternating current load and the single-phase alternating current load are supplied with power, so that the problems of interval blocking, line shutdown and poor passenger experience caused by long-time line shutdown waiting for rescue of a railway vehicle 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 technical aspects or prior art of the present application and constitute a part of this specification. The drawings, which are used to illustrate the technical solution of the present application, together with the embodiments of the present application, but do not limit the technical solution of the present application.
Fig. 1 is a schematic diagram 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 an ac-dc converter according to an embodiment of the present invention;
FIG. 4 is a control flow diagram of protection logic during AC/DC conversion starting of an AC/DC converter according to an embodiment of the present invention;
fig. 5 is a control flow chart of protection logic when the ac-dc converter starts up ac-dc conversion according to an embodiment of the present invention.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the corresponding technical effects can be fully understood and implemented accordingly. The embodiments and the features in the embodiments can be combined with each other under the condition of no conflict, and the formed technical schemes are all within the protection scope of the invention.
As shown in fig. 1, the ac-dc converter according to the present invention includes a main converter circuit 100 and a control unit 200;
the ac side of the converter main circuit 100 is connected to an ac catenary (not shown) 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 bow net of the railway vehicle is normal, the control unit 200 controls the main circuit 100 of the converter to conduct power from the alternating current contact net and to conduct alternating current-direct current conversion so as to supply power for the direct current load and charge the storage battery;
when the bow net of the railway vehicle is abnormal, such as the bow net abnormality caused by the power failure of the overhead net due to a natural disaster, the control unit 200 controls the converter main circuit 100 to draw power from the storage battery, perform the dc-ac conversion to supply power to the ac load, and supply power to the dc load.
Specifically, as shown in fig. 1, the main converter circuit 100 includes an ac interface module 110, an ac EMI filter 120, an ac filter capacitor module 130, a transformer 140, a converter module 150, a dc filter module 160, a dc EMI filter 170, and a dc interface module 180, which are sequentially connected;
an ac interface module 110 for implementing communication and disconnection between the ac-dc converter and the ac load, and fault isolation;
an ac EMI filter 120 for suppressing high-frequency noise from the ac side or the inside of the ac-dc converter;
an ac filter capacitor module 130 for cooperating with the transformer 140 to realize low-pass filtering;
a transformer 140 for realizing transformation and electrical isolation, and for realizing voltage adjustment together with the current transformation module during ac-dc transformation, and for realizing low-pass filtering together with the ac filter capacitor module 130 during ac-dc transformation;
a converter module 150 for rectifying during ac-dc conversion and inverting during dc-ac 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 on the dc side;
and the direct current interface module 180 is used for realizing the connection and disconnection between the alternating current-direct current converter and the storage battery as well as the direct current load and fault isolation.
In a specific embodiment, as shown in fig. 2, ac interface module 110 includes ac shorting contact 111, ac charging contact 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 starting surge current during ac-dc conversion, and can reduce the surge of the ac-dc converter output to the external ac load during ac-dc conversion. In this embodiment, the ac side is a three-phase ac system, and the contactors involved in the ac interface module 110 are all three-phase.
The ac shorting contactor 111 has one end connected to an ac catenary and an ac load (at point A, B, C in fig. 2) and the other end connected to an ac EMI filter 120 (at points A1, B1, and C1 in fig. 2).
In this embodiment, as shown in fig. 2, each phase of the ac charging contactor 112 is connected in series with the ac charging resistors 113, 114 and 115, and then is connected in parallel with the ac shorting contactor 111.
The ac EMI filter 120 is followed by the ac filter capacitor module 130, and according to different application scenarios, the ac filter capacitor module 130 includes a delta-connected filter capacitor module or a star-connected filter capacitor module, as shown in fig. 2, in this embodiment, the ac filter capacitor module 130 is a delta-connected filter capacitor module.
The ac filter capacitor module 130 is followed by a transformer 140, and in this embodiment, the high-voltage side winding and the low-voltage side winding of the transformer 140 are respectively star-connected and delta-connected. And has an outgoing neutral line (shown as N3-N2 in fig. 2) at the high-voltage side of the transformer 140, which is connected to an external ac load through the ac EMI filter 120, so as to supply power to the three-phase ac load while simultaneously supplying power to the single-phase ac load. It will be appreciated, of course, that the lead-out neutral line may be eliminated if no single-phase ac load is required.
The low voltage side of the transformer 140 is connected to a current transformation module 150, and in this embodiment, the current transformation module 150 is a three-phase full bridge circuit including six semiconductor switching devices. The semiconductor switching devices 151-156 as shown in fig. 2 constitute a three-phase full-bridge circuit as a current converting 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 through an intermediate dc positive line (shown as D1-D2 in fig. 2) and an intermediate dc negative line (shown as E1-E2 in fig. 2), respectively, and the dc filtering module 160 is connected in parallel between the intermediate dc positive line and the intermediate dc negative line.
In this embodiment, the dc filtering module 160 includes a dc filtering capacitor 161 and a discharge resistor 162 connected in parallel between the middle dc positive line and the middle dc negative line, respectively.
As shown in fig. 2, the dc EMI filter 170 is followed by a dc interface module 180, where in this embodiment, the dc interface module 180 includes a dc short-circuit contactor 181, a dc charging contactor 182, and a dc charging resistor 183, and the dc short-circuit contactor 181 and the dc charging contactor 182 are all single-phase contactors.
One end of the dc short-circuit contactor 181 is connected to the positive end of the dc side of the dc EMI filter 170 (i.e., at point D3 in fig. 2), and the other end is connected to the positive end of the dc load (at point D5) and the positive end 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 both ends of the dc shorting contactor 181.
The dc interface module 180 can suppress the charging current of the battery during ac-dc conversion, widen the output voltage range of the ac-dc converter, and prevent the dc filter capacitor 161 from being damaged by the starting surge current during dc-ac conversion.
Further, the dc interface module 180 further includes an anti-reflection diode 184; the anti-reverse diode 184 is disposed between the other end of the dc short-circuit contactor and the positive end (D4 point) of the battery, and is used for preventing the dc load from reversely transmitting power to the battery, so that the dc load can be normally maintained for power supply no matter the ac-dc converter works in ac-dc conversion or in dc-ac conversion.
As shown in fig. 3, the control unit 200 in the present 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 for detecting an ac ground voltage on a line between the ac interface module 110 and the ac EMI filter 120, that is, voltages of points A1, B1, and C1 to point N1 in fig. 2;
an ac current detection module 220 for detecting ac line current on a line between the ac interface module 110 and the ac EMI filter 120, specifically, line current of three phases A1, B1, and C1 in fig. 2;
the ac voltage detection module 230 is configured to detect an ac voltage to ground of the ac catenary, that is, a voltage corresponding to a point A, B, C to a point N in fig. 2;
a dc voltage detection 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 between a point D3 and a point E3 in fig. 2;
a dc current detection module 250 for detecting a current flowing through the dc side positive terminal of the dc EMI filter, that is, a current flowing through the point D3 in fig. 2;
a battery voltage detection module 260 for detecting voltages between the positive and negative terminals of the battery, i.e., terminal voltages of the battery;
a battery current detection module 270 for detecting a charging current of the storage 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 a switch control signal for driving the contactors to operate based on the detection signals, and generating a pulse signal for realizing the operation of the semiconductor switching device; and a driving module 290 for receiving the pulse signal and converting it into a driving signal for driving the semiconductor switching device to operate.
The AC-DC converter of the present invention is one part of the control system of railway vehicle, and the control system of railway vehicle provides one state quantity to the AC-DC converter to indicate the normal or abnormal bow net of railway vehicle.
The control flow of the protection logic when the ac-dc converter starts the ac-dc conversion and the ac-dc conversion will be briefly described with reference to fig. 4 and 5.
Fig. 4 is a schematic diagram of the protection logic flow when the ac-dc converter starts ac-dc conversion.
Firstly, detecting whether the AC network voltage accords with a set threshold value, if not, outputting a corresponding protection logic signal to exit a subsequent process without AC-DC conversion control; if it is in accordance with the rule,
continuously detecting whether the alternating current meets a set threshold value, if not, outputting a corresponding protection logic signal, and exiting a subsequent process of not performing alternating-direct conversion control; if it is in accordance with the rule,
continuing to control the AC charging contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the control result is normal, the control result is that,
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 of not performing AC-DC conversion control; if the control result is normal, the control result is that,
continuously carrying out rectification control of the converter unit, outputting corresponding protection logic signals if the control result is abnormal, and exiting the subsequent process of not carrying out AC-DC conversion control; if the control result is normal, the control result is that,
continuing to control the direct current charging contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process of not performing alternating-direct current conversion control; if the control result is normal, the control result is that,
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 of not performing alternating-current-direct-current conversion control; if the control result is normal, the control result is that,
continuing to detect the direct-current voltage, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing alternating-current-direct-current conversion control; if the detection result is normal,
continuing to detect the direct current, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing alternating-direct conversion control; if the detection result is normal,
continuing to detect the battery voltage, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the detection result is normal,
continuing to detect the battery current (charging current), outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the control result is normal, the normal AC/DC conversion working state is entered.
Fig. 5 is a schematic diagram of a protection logic flow when the ac-dc converter starts dc conversion to ac. Similar to fig. 4, the protection logic determination is performed only from the dc side, and will not be described in detail here.
When the bow net of the railway vehicle is normal, the AC-DC converter is powered from the AC contact net to perform AC-DC conversion, and supplies power to the DC load and charges the storage battery. When the railway bow net is abnormal, the storage battery is discharged, direct current is converted into alternating current, and the alternating current load and the single-phase alternating current load are supplied with power, for example, short-time emergency power supply is provided for a motor, an air conditioner and the like, so that the railway vehicle can leave an operation line by itself, the problems of interval blocking and line shutdown caused by long-time line stopping waiting for rescue of the railway vehicle in the prior art are avoided, the power is supplied to loads such as the air conditioner and the like, the problem that the experience of passengers of the vehicle is poor at the moment can be improved, and the operation experience is ensured.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
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 net 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 the bow net of the railway vehicle is normal, the control unit controls the main circuit of the converter to conduct power from the alternating current contact net and conduct alternating current-direct current conversion so as to supply power for the direct current load and charge the storage battery;
when the bow net of the railway vehicle is abnormal, the control unit controls the main circuit of the converter to conduct electricity from the storage battery, conduct direct-to-alternating-current conversion to supply power for the alternating-current load and supply power for the direct-current load;
the converter main circuit comprises an alternating current interface module, an alternating current EMI filter, an alternating current filter capacitor module, a transformer, a converter 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 the communication and breaking of 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 the alternating-current side or the inside of the alternating-current-to-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 jointly realizing voltage adjustment with the current transformation module during AC/DC conversion and jointly realizing low-pass filtering 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 DC-AC 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 of the alternating-current/direct-current converter or the direct-current side;
the direct current interface module is used for realizing the connection and disconnection between the alternating current-direct current converter and the storage battery as well as the direct current load and fault isolation;
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;
the alternating-current charging contactor is connected with the alternating-current charging resistor in series and then connected in parallel to two ends of the alternating-current short-circuit contactor;
the direct current interface module comprises a direct current short circuit contactor, a direct current charging contactor and a direct current 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;
the direct-current charging contactor is connected with the direct-current charging resistor in series and then connected in parallel to the two ends of the direct-current short-circuit contactor;
the protection steps when the AC-DC converter starts AC conversion to DC are as follows: firstly, detecting whether the AC network voltage accords with a set threshold value, if not, outputting a corresponding protection logic signal to exit a subsequent process without AC-DC conversion control; if it is in accordance with the rule,
continuously detecting whether the alternating current meets a set threshold value, if not, outputting a corresponding protection logic signal, and exiting a subsequent process of not performing alternating-direct conversion control; if it is in accordance with the rule,
continuing to control the AC charging contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the control result is normal, the control result is that,
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 of not performing AC-DC conversion control; if the control result is normal, the control result is that,
continuously carrying out rectification control of the converter unit, outputting corresponding protection logic signals if the control result is abnormal, and exiting the subsequent process of not carrying out AC-DC conversion control; if the control result is normal, the control result is that,
continuing to control the direct current charging contactor, outputting a corresponding protection logic signal if the control result is abnormal, and exiting the subsequent process of not performing alternating-direct current conversion control; if the control result is normal, the control result is that,
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 of not performing alternating-current-direct-current conversion control; if the control result is normal, the control result is that,
continuing to detect the direct-current voltage, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing alternating-current-direct-current conversion control; if the detection result is normal,
continuing to detect the direct current, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing alternating-direct conversion control; if the detection result is normal,
continuing to detect the battery voltage, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the detection result is normal,
continuing to detect the battery charging current, outputting a corresponding protection logic signal if the detection result is abnormal, and exiting the subsequent process of not performing AC-DC conversion control; if the control result is normal, the normal AC/DC conversion working state is entered.
2. The ac-dc converter of claim 1, wherein the ac filter capacitor module comprises a delta-connected filter capacitor module or a star-connected filter capacitor module.
3. The ac/dc converter according to claim 2, wherein the high-voltage side coil and the low-voltage side coil of the transformer are respectively star-connected and delta-connected; the high-voltage side coil is provided with an outgoing center line and is used for supplying power to the single-phase alternating current load when supplying power to the three-phase alternating current load.
4. An ac-dc converter according to claim 3 wherein the current converting module is a three-phase full bridge circuit comprising six semiconductor switching devices;
the three-phase full-bridge circuit is correspondingly connected with the alternating-current side positive end and the alternating-current side negative end of the direct-current EMI filter through a middle direct-current positive line and a middle direct-current negative line respectively, and the direct-current filtering module is connected between the middle direct-current positive line and the middle direct-current negative line in parallel.
5. The ac-dc converter of claim 4, wherein the dc filtering module includes a dc filtering capacitor and a discharge resistor connected in parallel between the intermediate dc positive line and the intermediate dc negative line, respectively.
6. The ac to dc converter of claim 5, wherein the dc interface module further comprises an anti-reflection diode;
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 used for preventing the direct current load from reversely transmitting electricity to the storage battery.
7. The ac-dc converter of claim 6, wherein the control unit comprises an ac voltage detection module, an ac current detection module, an ac network voltage detection module, a dc current detection module, a battery voltage detection module, a battery current detection module, a controller, and a drive module;
the alternating current voltage detection module is used for detecting alternating current 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 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 alternating current ground voltage 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 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 operate based on the detection signals, and generating pulse signals for realizing the operation 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.
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| CN201810697492.2A CN110661331B (en) | 2018-06-29 | 2018-06-29 | AC-DC converter |
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| CN201810697492.2A CN110661331B (en) | 2018-06-29 | 2018-06-29 | AC-DC converter |
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