CN113644629A - Short-circuit protection device for rail transit traction power supply bidirectional converter system and control method thereof - Google Patents
Short-circuit protection device for rail transit traction power supply bidirectional converter system and control method thereof Download PDFInfo
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- CN113644629A CN113644629A CN202110814437.9A CN202110814437A CN113644629A CN 113644629 A CN113644629 A CN 113644629A CN 202110814437 A CN202110814437 A CN 202110814437A CN 113644629 A CN113644629 A CN 113644629A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a short-circuit protection device of a rail transit traction power supply bidirectional converter system and a control method thereof, wherein the device comprises the following steps: the high-voltage side of the isolation transformer is connected with an alternating current power grid, and the low-voltage side of the isolation transformer is connected with the alternating current side low-voltage circuit breaker of the bidirectional conversion system and the output end of the protection module; the input end of the protection module is connected with the direct current side of the bidirectional converter system; the switch module is connected in series with a direct current loop of the bidirectional variable flow system power module; the control module obtains the direct current value of the input side of the protection module, and blocks the driving signals of the switch module and the bidirectional conversion system power module when the direct current value is greater than or equal to the preset overcurrent protection value, and short-circuit current or overload current is discharged to a low-voltage winding of the transformer. When a short-circuit fault or overload current occurs in a traction direct-current contact network, IGBT driving signals of the power module and the switch module are locked, and the short-circuit current or the overload current is released to a low-voltage side winding of the transformer so as to protect components of the power module from being damaged.
Description
Technical Field
The invention relates to the field of power electronic control, in particular to a short-circuit protection device of a rail transit traction power supply bidirectional converter system and a control method thereof.
Background
In recent years, urban rail transit has gradually become a daily choice for urban residents to live and go out, wherein an urban rail transit traction power supply system mainly provides a direct-current power supply for rail transit vehicles and other loads. With the continuous expansion of the urban rail transit road network scale, the higher departure density and the frequent train braking, the generated energy is continuously increased and accounts for about 20-40% of the energy of the traction power supply system. At present, a rectifier unit configured in a rail transit system is 24-pulse uncontrolled rectification, and converts 35kV alternating current into direct current of a DC1500V grade through a rectifier transformer and a rectification module so as to provide a power supply for a load on a direct current traction contact network. The subway traction power supply bidirectional converter device can realize bidirectional flow of energy between a direct-current traction contact network and an alternating-current power grid, not only can provide energy for the direct-current traction contact network, support and stabilize the voltage of the direct-current traction contact network, but also can absorb redundant regenerative braking energy during train braking, feed back the redundant regenerative braking energy to the alternating-current power grid, and improve the energy utilization rate of a traction power supply system.
Meanwhile, the subway traction power supply bidirectional converter is required to have direct-current side short-circuit protection and overload protection capabilities, and is required to bear short-circuit current which is 20 times of rated current of the device for about 10ms and bear short-circuit current which is 12 times of rated current of the device for about 120 ms. When a traction direct-current contact network has a short-circuit fault or runs in an overload mode, a 1500V switch cabinet direct-current circuit breaker of the currently configured traction network, a subway traction power supply bidirectional converter direct-current contactor and the like are limited by breaking capacity and protection time, before a protection switch is disconnected, an anti-parallel diode of a three-phase bridge arm IGBT module of a power module of the subway traction power supply bidirectional converter cannot bear large follow current, meanwhile, an alternating-current system continuously provides current for a direct-current side fault point through a three-phase uncontrolled rectifying circuit, the power module of the subway traction power supply bidirectional converter is damaged due to the fact that the current exceeds the tolerance current of the power module of the subway traction power supply bidirectional converter, and the device cannot run normally.
Therefore, the damage caused by short-circuit fault, overload and the like on the direct current side of the subway traction power supply bidirectional converter needs to be effectively avoided, the traction power supply bidirectional converter can be ensured to exit from operation or shift to standby when the fault occurs, meanwhile, the device can still maintain normal operation after the fault is removed, and the influence of short-circuit current and overload current on the device is effectively reduced.
Disclosure of Invention
The invention aims to provide a short-circuit protection device for a rail transit traction power supply bidirectional converter system, which is used for avoiding the damage of short-circuit current to components of a power module of the rail transit traction power supply bidirectional converter system when a traction direct-current contact network has short-circuit fault or overload current in urban rail transit, when the traction direct-current contact network has short-circuit fault or overload current, an anti-parallel diode of a three-phase bridge arm IGBT module of a subway traction power supply bidirectional converter system power module cannot bear large follow current, the short-circuit protection device can lock an IGBT driving pulse signal of the power module and an IGBT driving pulse of a switch module when the traction direct-current contact network has fault, the short-circuit current or the overload current is discharged to a transformer low-voltage side winding at the side of a power grid through a protection module, the internal power devices of the traction power supply bidirectional converter device are protected from being damaged, and the device can still maintain normal operation after the fault is cut off, the influence of short circuit and overload current on the device is reduced most effectively.
In order to solve the technical problem, a first aspect of the embodiments of the present invention provides a short-circuit protection device for a rail transit traction power supply bidirectional converter system, including an isolation transformer, a protection module, a switch module, a heat dissipation module and a control module;
the high-voltage side of the isolation transformer is connected with an alternating current power grid, and the low-voltage side of the isolation transformer is respectively connected with an alternating current side low-voltage circuit breaker of a bidirectional conversion system and the output end of the protection module;
the input end of the protection module is connected with the direct current side of the bidirectional variable flow system;
the switch module is arranged on the direct current side of the power module of the bidirectional conversion system in series;
the control module obtains a direct current value at the input side of the protection module, and blocks a pulse signal of the switch module and a pulse signal of the bidirectional conversion system power module when the direct current value is greater than or equal to a preset overcurrent protection value, so that the bidirectional conversion system stops running, and short-circuit current or overload current is discharged to a low-voltage winding of an isolation transformer to protect the power module from running normally.
Further, the low voltage side of the isolation transformer comprises: a first low voltage winding and a second low voltage winding;
the first low-voltage winding is connected with the alternating current output side of the protection module;
and the second low-voltage winding is connected with an alternating-current side low-voltage circuit breaker of the bidirectional conversion system.
Further, still include: the heat dissipation module is used for dissipating heat of the protection module arranged on the surface of the heat dissipation module;
the heat dissipation module includes: radiator and cooling fan.
Further, the heat dissipation module includes: a temperature sensor and a temperature relay;
the temperature sensor is arranged on the surface of the radiator, acquires the surface temperature of the radiator and sends the surface temperature of the radiator to the control module;
the temperature relay is arranged on the surface of the radiator, a feedback signal of the temperature relay is connected with a signal input interface of the control module, the surface temperature of the radiator exceeds the set threshold value of the temperature relay, the feedback signal of the temperature relay is normally opened and converted into normally closed, the conversion signal is transmitted to the control module, and the protection module stops running according to the control instruction control of the control module.
Further, the switch module includes: the circuit comprises a first IGBT unit, a second IGBT unit and an RC absorption loop;
the common emitters of the first IGBT unit and the second IGBT unit are connected in reverse series, the collector of the first IGBT unit is an input end, and the collector of the second IGBT unit is an output end;
and the RC absorption loop is connected with the driving interfaces of the first IGBT unit and the second IGBT unit.
Further, the RC snubber circuit of the switching module includes: the circuit comprises a first resistor, a second resistor, a first diode, a second diode, a first capacitor and a second capacitor;
the first resistor is connected in parallel with the first diode, and the second resistor is connected in parallel with the second diode;
one end of the first resistor is connected with the cathode of the second diode through the first capacitor and the second capacitor;
the anode of the first diode is connected with the collector of the first IGBT unit, and the anode of the second diode is connected with the collector of the second IGBT unit.
Correspondingly, a first aspect of the embodiments of the present invention provides a control method for a short-circuit protection device of a rail transit traction power supply bidirectional converter system, including the following steps:
acquiring a direct current value of the direct current side of the bidirectional converter device through a control module;
judging whether the direct current value is greater than or equal to a direct current side overcurrent protection value preset by the control module;
if the direct current value is greater than or equal to the direct current side overcurrent protection value, blocking a pulse signal of a switch module and a pulse signal of a power module to stop the operation of the bidirectional conversion system, and discharging short-circuit current or overload current to a low-voltage winding of an isolation transformer to protect the power module of the bidirectional conversion system;
and if the direct current value is smaller than the preset protection value at the direct current side, keeping the pulse signal of the power module to enable the bidirectional variable current system to continue to operate.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
when a short-circuit fault or overload current occurs to the traction direct-current contact network, the IGBT driving pulse signal of the power module and the IGBT driving pulse of the switch module are locked, the short-circuit current or the overload current is discharged to a transformer low-voltage side winding of a power grid side through a protection module of the short-circuit protection device, so that the internal power device of the traction power supply bidirectional converter is protected from being damaged, the device can still normally operate after the fault is removed, and the influence of the short-circuit current and the overload current on the device is effectively reduced.
Drawings
Fig. 1 is a topology structure diagram of a short-circuit protection device of a rail transit traction power supply bidirectional converter system provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a short-circuit protection device of a rail transit traction power supply bidirectional converter system according to an embodiment of the present invention;
fig. 3 is a topology structure diagram of a switch module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a topology structure diagram of a short-circuit protection device of a rail transit traction power supply bidirectional converter system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a short-circuit protection device of a rail transit traction power supply bidirectional converter system according to an embodiment of the present invention.
Referring to fig. 1 and fig. 2, a first aspect of an embodiment of the present invention provides a short-circuit protection device for a rail transit traction power supply bidirectional converter system, including: isolation transformer, protection module, switch module, heat dissipation module and control module. The high-voltage side of the isolation transformer is connected with an alternating current power grid, and the low-voltage side of the isolation transformer is respectively connected with an alternating current side low-voltage circuit breaker of the bidirectional conversion system and the output end of the protection module; the input end of the protection module is connected with the direct current side of the bidirectional variable flow system; the switch module is serially connected with the output end of the power module of the bidirectional variable flow system; the control module obtains a direct current value at the input side of the protection module, and blocks a pulse signal of the switch module and a pulse signal of the bidirectional conversion system power module when the direct current value is greater than or equal to a direct current side overcurrent protection value preset by the control module, so that the bidirectional conversion system stops running, and short-circuit current or overload current is discharged to a low-voltage winding of the isolation transformer to protect the power module.
When the short-circuit protection device is used for dragging a direct-current contact network to generate a short-circuit fault or overload current, the IGBT driving pulse signal of the power module and the IGBT driving pulse of the switch module are locked, and the short-circuit current or the overload current is released to a transformer low-voltage side winding on a power grid side through the protection module of the short-circuit protection device, so that the internal power device of the traction power supply bidirectional converter is protected from being damaged, the device can still normally operate after the fault is removed, and the influence of the short-circuit and the overload current on the device is effectively reduced.
Specifically, the output end of the protection module (SCR) is connected with a low-voltage side winding (a1b1c1) of a transformer (TR1), the input end of the protection unit is connected with the direct current side (DC +, DC-) of the subway traction power supply bidirectional converter, and meanwhile the protection unit needs to be provided with a heat dissipation module and an alarm protection unit thereof.
When the direct current bus voltage (namely the direct current side of the protection unit (SCR)) of the rail transit power supply system rises to be larger than the three-phase peak voltage of the alternating current side of the traction power supply bidirectional converter, the direct current side voltage of the protection module (SCR) is larger than the alternating current side voltage, the controllable thyristor (SCR) is controlled to be cut off, and therefore electric energy on the alternating current side of the traction power supply bidirectional converter cannot be transmitted to the direct current traction contact network side through the controllable thyristor (SCR).
The control module (KZ) is mainly used for sampling the current value of the input side of the protection unit, controlling the pulse signal of the power unit of the rail transit traction power supply bidirectional converter and monitoring the using state of the short-circuit protection module.
Further, the low voltage side of the isolation transformer comprises: the protection module comprises a first low-voltage winding and a second low-voltage winding, wherein the first low-voltage winding is connected with the alternating current output side of the protection module, and the second low-voltage winding is connected with an alternating current side low-voltage circuit breaker of the bidirectional conversion system.
The isolation Transformer (TR) is mainly an AC side 35kV transformer, the transformer is cast by dry, indoor, self-cooling and epoxy resin, the connection mode is Dy11/y11, the high-voltage side is connected with a 35kV AC power grid, the low-voltage side is divided into 2 windings, the low-voltage side is respectively connected with the AC output side of the protection module and an AC side low-voltage circuit breaker of a rail transit traction power supply bidirectional conversion system, the voltage is the AC rated voltage of the traction power supply bidirectional conversion device, and when the DC side has a short-circuit fault, the short-circuit protection device releases short-circuit current or overload current to the low-voltage side winding of the transformer.
Optionally, the isolation transformer is a 35kV double split transformer.
Further, still include: and the heat dissipation module is used for dissipating heat of the protection module arranged on the surface of the heat dissipation module. The heat dissipation module includes: radiator and cooling fan.
Furthermore, the alarm protection unit of the heat dissipation module comprises a temperature sensor and a temperature relay; the temperature sensor is arranged on the surface of the radiator, acquires the surface temperature of the radiator and sends the surface temperature of the radiator to the control module; the temperature relay is arranged on the surface of the radiator, a feedback signal of the temperature relay is connected with a signal input interface of the control module, when the surface temperature of the radiator exceeds a set threshold value of the temperature relay, the feedback signal of the temperature relay is normally opened and converted into normally closed, the converted signal is transmitted to the control module, and the protection module is controlled to stop running according to a control instruction of the control module.
The heat dissipation module mainly comprises a radiator and a heat dissipation fan which are configured by a controllable thyristor (SCR) of a protection module, and a PT100 temperature sensor and an 85 ℃ temperature relay are arranged on the radiator to form an alarm protection unit, so that the surface temperature of the radiator is collected in real time and is transmitted to the control module, and the protection module has hardware and software over-temperature protection.
Fig. 3 is a topology structure diagram of a switch module according to an embodiment of the present invention.
Referring to fig. 3, the switch module includes: the circuit comprises a first IGBT unit, a second IGBT unit and an RC absorption loop; the common emitters of the first IGBT unit and the second IGBT unit are connected in reverse series, the collector of the first IGBT unit is an input end, and the collector of the second IGBT unit is an output end; the RC absorption loop is connected with the driving interfaces of the first IGBT unit and the second IGBT unit.
The switch module is mainly composed of two common emitter (E pole) reverse series IGBT and a driving circuit thereof, when the direct current side of the traction network is in short circuit fault, the common emitter (E pole) IGBT1 and the common emitter (E pole) IGBT2 are directly turned off, and the power module in the traction power supply bidirectional converter is prevented from being damaged by short circuit current.
Further, the RC snubber circuit of the switching module includes: the circuit comprises a first resistor, a second resistor, a first diode, a second diode, a first capacitor and a second capacitor; the first resistor is connected with the first diode in parallel, and the second resistor is connected with the second diode in parallel; one end of the first resistor is connected with the cathode of the second diode through the first capacitor and the second capacitor; the anode of the first diode is connected with the collector of the first IGBT unit; the anode of the second diode is connected to the collector of the second IGBT cell.
The short-circuit protection device samples the direct current value of the input side of the protection module in real time, compares the sampled direct current value with the direct current side overcurrent protection value preset by the control module, and judges whether a short-circuit fault or an overload condition exists on the direct current side. If no fault exists, the pulse signal of the power unit is kept, the device continues to operate, if a short-circuit fault or overload condition occurs, the pulse signals of the switch unit and the power unit are blocked, the device is switched to a shutdown state, the protection module is put into use, short-circuit current or overload current is discharged to a transformer low-voltage side winding on the side of a power grid, the power device in the traction power supply bidirectional converter is protected from being damaged, meanwhile, the device can still maintain normal operation after the fault is cut off, and the influence of the short-circuit and the overload current on the device is effectively reduced. Meanwhile, the surface temperature of the radiator is acquired in real time when the alarm protection unit works, the alarm protection unit judges whether the radiating system has an over-temperature fault, and the controllable thyristor of the protection unit cannot be damaged due to over-high temperature.
Correspondingly, a first aspect of the embodiments of the present invention provides a control method for a short-circuit protection device of a rail transit traction power supply bidirectional converter system, including the following steps:
and S100, acquiring electrical parameters of a direct current side and an alternating current side of the bidirectional converter.
And S200, judging whether the direct current value is greater than or equal to a direct current side overcurrent protection value preset by the control module.
And S300, if the direct current value is greater than or equal to the direct current side overcurrent protection value, blocking the pulse signal of the switch module and the pulse signal of the bidirectional conversion system power module to stop the operation of the bidirectional conversion system, and discharging short-circuit current or overload current to a low-voltage winding of the isolation transformer to protect the power module.
And S400, if the direct current value is smaller than the direct current side overcurrent protection value, keeping the pulse signal of the power module to enable the bidirectional variable flow system to continue to operate.
The embodiment of the invention aims to protect a short-circuit protection device and a control method of a rail transit traction power supply bidirectional converter system, wherein the device comprises: the device comprises an isolation transformer, a protection module, a switch module, a heat dissipation module and a control module; the high-voltage side of the isolation transformer is connected with an alternating current power grid, and the low-voltage side of the isolation transformer is respectively connected with an alternating current side low-voltage circuit breaker of the bidirectional conversion system and the output end of the protection module; the input end of the protection module is connected with the direct current side of the bidirectional variable flow system; the switch module is serially connected with the direct current side of the power module of the bidirectional variable flow system; the control module obtains a direct current value of an input side of the protection module, and blocks a pulse signal of the switch module and a pulse signal of the bidirectional conversion system power module when the direct current value is greater than or equal to a preset direct current side overcurrent protection value of the control module, so that the bidirectional conversion system stops running, and short-circuit current or overload current is discharged to a low-voltage winding of the isolation transformer to protect the power module. The technical scheme has the following effects:
when a short-circuit fault or overload current occurs in a traction direct-current contact network, an IGBT driving pulse signal of a power module of the bidirectional converter system and an IGBT driving pulse of a switch module are locked, the short-circuit current or the overload current is discharged to a transformer low-voltage side winding of a power grid side through a protection module, so that the internal power device of the traction power supply bidirectional converter device is protected from being damaged, the device can still normally operate after the fault is removed, the influence of the short circuit and the overload current on the device is effectively reduced, the reliability of the subway traction power supply bidirectional converter device is improved, meanwhile, the stable operation of the direct-current traction system can be supported, and the short-circuit tolerance of the system is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. The utility model provides a rail transit draws power supply bidirectional conversion system short-circuit protection device which characterized in that includes: the device comprises an isolation transformer, a protection module, a switch module and a control module;
the high-voltage side of the isolation transformer is connected with an alternating current power grid, and the low-voltage side of the isolation transformer is respectively connected with an alternating current side low-voltage circuit breaker of a bidirectional conversion system and the output end of the protection module;
the input end of the protection module is connected with the direct current side of the bidirectional variable flow system;
the switch module is arranged on the direct current side of the bidirectional conversion system power module in series;
the control module obtains a direct current value at the input side of the protection module, and blocks a driving signal of the switch module and a driving signal of the bidirectional conversion system power module when the direct current value is greater than or equal to a direct current side overcurrent protection value, so that the bidirectional conversion system stops running, and short-circuit current or overload current is discharged to a low-voltage winding of the isolation transformer to protect the power module of the bidirectional conversion system.
2. The rail transit traction power supply bidirectional variable flow system short-circuit protection device as claimed in claim 1,
the low voltage side of the isolation transformer comprises: a first low voltage winding and a second low voltage winding;
the first low-voltage winding is connected with the alternating current output side of the protection module;
and the second low-voltage winding is connected with the alternating-current side low-voltage circuit breaker of the bidirectional conversion system.
3. The rail transit traction power supply bidirectional converter system short-circuit protection device according to claim 1, further comprising: the heat dissipation module is used for dissipating heat of the protection module arranged on the surface of the heat dissipation module;
the heat dissipation module includes: radiator and cooling fan.
4. The rail transit traction power supply bidirectional converter system short-circuit protection device as claimed in claim 3,
the heat dissipation module further includes: an alarm protection unit;
the alarm protection unit includes: a temperature sensor and a temperature relay;
the temperature sensor is arranged on the surface of the radiator, acquires the surface temperature of the radiator and sends the surface temperature of the radiator to the control module;
the temperature relay is arranged on the surface of the radiator and is connected with the signal input interface of the control module;
when the surface temperature of the radiator exceeds the set threshold value of the temperature relay, the feedback signal of the temperature relay is converted from normally open to normally closed, the conversion signal is transmitted to the control module, and the thyristor of the protection module is controlled to stop running according to the control instruction of the control module.
5. The rail transit traction power supply bidirectional converter system short-circuit protection device according to claim 1,
the switch module includes: the circuit comprises a first IGBT unit, a second IGBT unit and an RC absorption loop;
the common emitters of the first IGBT unit and the second IGBT unit are connected in reverse series, the collector of the first IGBT unit is an input end, and the collector of the second IGBT unit is an output end, so that energy can flow in two directions;
the RC absorption loop is respectively connected with the driving interfaces of the first IGBT unit and the second IGBT unit.
6. The rail transit traction power supply bidirectional converter system short-circuit protection device as claimed in claim 5,
the RC absorption circuit of the switch module comprises: the circuit comprises a first resistor, a second resistor, a first diode, a second diode, a first capacitor and a second capacitor;
the first resistor is connected in parallel with the first diode, and the second resistor is connected in parallel with the second diode;
one end of the first resistor, which is connected with the cathode of the first diode, is connected with the cathode of the second diode through the first capacitor and the second capacitor;
the anode of the first diode is connected with the collector of the first IGBT unit, and the anode of the second diode is connected with the collector of the second IGBT unit.
7. A control method for a short-circuit protection device of a rail transit traction power supply bidirectional converter system is characterized by comprising the following steps:
acquiring a direct current value of the direct current side of the bidirectional converter device through a control module;
judging whether the direct current value is greater than or equal to a direct current side overcurrent protection value preset by the control module;
if the direct current value is greater than or equal to the direct current side overcurrent protection value, blocking a pulse signal of a switch module and a pulse signal of a power module to stop the operation of the bidirectional conversion system, and discharging short-circuit current or overload current to a low-voltage winding of an isolation transformer to protect the power module of the bidirectional conversion system;
and if the direct current value is smaller than the direct current side overcurrent protection value, maintaining the pulse signal of the power module to enable the bidirectional variable flow system to continue to operate.
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| CN202110814437.9A CN113644629A (en) | 2021-07-19 | 2021-07-19 | Short-circuit protection device for rail transit traction power supply bidirectional converter system and control method thereof |
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| CN202110814437.9A CN113644629A (en) | 2021-07-19 | 2021-07-19 | Short-circuit protection device for rail transit traction power supply bidirectional converter system and control method thereof |
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| CN206004524U (en) * | 2016-08-30 | 2017-03-08 | 广东电网有限责任公司电力科学研究院 | A kind of IGBT absorbing circuit of three-phase imbalance adjustment module |
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| CN109698496A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of rail traffic tractive power supply system and control method |
| CN209200955U (en) * | 2018-11-20 | 2019-08-02 | 西安许继电力电子技术有限公司 | A kind of traction power supply bidirectional current transformer applied within coal mines |
| CN112750661A (en) * | 2020-12-29 | 2021-05-04 | 浙江安迅电气股份有限公司 | High-voltage relay and protection method thereof |
| CN112953285A (en) * | 2021-02-20 | 2021-06-11 | 阳光电源股份有限公司 | Series inverter system and protection method thereof |
| CN112994668A (en) * | 2021-02-10 | 2021-06-18 | 新能动力(北京)智慧能源科技有限公司 | AC electronic switch device |
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2021
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| CN101350613A (en) * | 2007-07-17 | 2009-01-21 | 中兴通讯股份有限公司 | Electronic switch |
| CN204068908U (en) * | 2014-08-29 | 2014-12-31 | 国家电网公司 | A kind of DC circuit breaker |
| CN206004524U (en) * | 2016-08-30 | 2017-03-08 | 广东电网有限责任公司电力科学研究院 | A kind of IGBT absorbing circuit of three-phase imbalance adjustment module |
| CN109698496A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of rail traffic tractive power supply system and control method |
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| CN112750661A (en) * | 2020-12-29 | 2021-05-04 | 浙江安迅电气股份有限公司 | High-voltage relay and protection method thereof |
| CN112994668A (en) * | 2021-02-10 | 2021-06-18 | 新能动力(北京)智慧能源科技有限公司 | AC electronic switch device |
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