CN108899893B - Protection system of energy-feedback traction power supply device and rail transit power supply system - Google Patents
Protection system of energy-feedback traction power supply device and rail transit power supply system Download PDFInfo
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- CN108899893B CN108899893B CN201810589422.5A CN201810589422A CN108899893B CN 108899893 B CN108899893 B CN 108899893B CN 201810589422 A CN201810589422 A CN 201810589422A CN 108899893 B CN108899893 B CN 108899893B
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The invention discloses a protection system of an energy feedback type traction power supply device, which comprises a protection module, a switch unit and a monitoring module, wherein when the direct current side of the protection module has a short-circuit fault, the switch unit is controlled to be switched off by the monitoring module, so that the energy feedback type traction power supply device is cut out from a rail transit power supply system, the protection module provides a current discharge path, and the short-circuit impact current on the direct current side of the energy feedback type traction power supply device is discharged to a direct current side short-circuit point through the protection module, so that the energy feedback type traction power supply device is prevented from being damaged by the short-circuit impact current, and the normal work of the energy feedback type traction power supply device is ensured. The invention also discloses a rail transit power supply system which has the beneficial effects.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a protection system of an energy feedback type traction power supply device and a rail transit power supply system.
Background
At present, a 24-pulse uncontrolled rectifying device is mostly adopted in a rail transit power supply system to convert electric energy from three-phase alternating current to direct current so as to provide a direct current power supply for rail transit vehicles. In order to realize the bidirectional flow of energy at the direct current side and the alternating current side of the rail transit power supply system and provide stable direct current touch network voltage, an energy feedback type traction power supply device is introduced into the rail transit power supply system. Generally, when a short-circuit fault occurs on a direct-current side of a rail transit power supply system, a regenerative traction power supply device needs to have a certain short-circuit current impact capability, namely, 20 times of rated current for about 10ms and 12 times of rated current for about 120ms, but none of the existing semiconductor switching devices applicable to the regenerative traction power supply device has the capability of bearing the short-circuit impact current, so that when the short-circuit fault occurs on the direct-current side of the rail transit power supply system, the existing semiconductor switching devices can be damaged, and the regenerative traction power supply device cannot normally work.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a protection system of an energy feedback type traction power supply device, which avoids the damage of the energy feedback type traction power supply device caused by short-circuit impact current and ensures the normal work of the energy feedback type traction power supply device; the invention further aims to provide a rail transit power supply system.
In order to solve the technical problem, the invention provides a protection system of an energy feedback type traction power supply device, which comprises a protection module, a switch unit and a monitoring module, wherein:
the first end of the switch unit is connected with the direct current side of the energy-feedback traction power supply device, the second end of the switch unit is connected with the direct current side of the protection module, the direct current side of the protection module is connected with the direct current touch network, the alternating current side of the protection module is connected with the alternating current side of the energy-feedback traction power supply device, and the common end of the protection module is connected with a three-phase alternating current network;
the monitoring module is used for acquiring a first operating parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault according to the first operating parameter, if not, generating a first signal, and if so, generating a second signal;
the switch unit is used for being switched on after receiving the first signal, so that the energy feedback type traction power supply device controls the protection module and the rail transit power supply system to be switched off; and the protection module is also used for switching off after receiving the second signal, so that the short circuit impact current on the direct current side of the protection module is discharged to a direct current side short circuit point through the protection module.
Preferably, the switching unit is a power switching device.
Preferably, the protection module is a rectifier.
Preferably, the protection system further includes a turn-off module, configured to output a reverse voltage to the switching unit after receiving the second signal, so as to control the switching unit to turn off.
Preferably, the monitoring module is further configured to:
and acquiring a second operation parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault according to the second operation parameter, if not, generating the first signal, and if so, generating the second signal.
Preferably, the first operating parameter is a first current value, and the second operating parameter is a second current value.
Preferably, the determining, according to the first operating parameter, whether a short-circuit fault exists at a dc side of the protection module, if not, generating a first signal, and if so, generating a second signal specifically includes:
judging whether the first current value is larger than a first preset value or not, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists on the direct-current side of the protection module is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and judging whether the second current value is larger than the first preset value or not, if not, generating the first signal, and if so, generating the second signal.
Preferably, the determining, according to the first operating parameter, whether a short-circuit fault exists at a dc side of the protection module, if not, generating a first signal, and if so, generating a second signal specifically includes:
obtaining a first current change rate according to the first current value, judging whether the first current change rate is larger than a second preset value, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists on the direct-current side of the protection module is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and judging whether the second change rate is larger than the second preset value or not according to the second current change rate obtained by the second current, if not, generating the first signal, and if so, generating the second signal.
Preferably, the protection system further comprises:
and the alarm module is used for sending out an alarm after receiving the second signal.
In order to solve the technical problem, the invention further provides a rail transit power supply system, which comprises the protection system of the energy feedback type traction power supply device.
The invention provides a protection system of an energy feedback type traction power supply device, which comprises a protection module, a switch unit and a monitoring module, wherein: the first end of the switch unit is connected with the direct current side of the energy feedback type traction power supply device, the second end of the switch unit is connected with the direct current side of the protection module, the direct current side of the protection module is connected with the direct current touch network, the alternating current side of the protection module is connected with the alternating current side of the energy feedback type traction power supply device, and the common end of the protection module is connected with the three-phase alternating current network; the monitoring module is used for acquiring a first operating parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault or not according to the first operating parameter, if not, generating a first signal, and if so, generating a second signal; the switch unit is used for being switched on after receiving the first signal, and the energy feedback type traction power supply device controls the protection module to be switched off from the rail transit power supply system; and the protection module is also used for switching off after receiving the second signal, so that the short circuit impact current on the direct current side of the protection module is discharged to a direct current side short circuit point through the protection module.
Therefore, in practical application, by adopting the scheme of the invention, when a short-circuit fault occurs on the direct current side of the protection module, the switch unit is controlled to be switched off through the monitoring module, the energy feedback type traction power supply device is switched out of the rail transit power supply system, the protection module provides a current discharge path, and short-circuit impact current on the direct current side of the energy feedback type traction power supply device is discharged to a direct current side short-circuit point through the discharge of the protection module, so that the energy feedback type traction power supply device is prevented from being damaged by the short-circuit impact current, and the normal work of the energy feedback type traction power supply device is ensured.
The invention also provides a rail transit power supply system which has the same beneficial effects as the protection system of the energy feedback type traction power supply device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a protection system of an energy feedback type traction power supply device provided in the present invention;
fig. 2 is a schematic structural diagram of a rail transit power supply system provided in the present invention;
fig. 3 is a schematic structural diagram of a protection system of an energy feedback type traction power supply device applied to a rail transit power supply system according to the present invention;
fig. 4 is a schematic structural diagram of an embodiment of a protection system of an energy feedback type traction power supply device provided in the present invention;
fig. 5 is a schematic structural diagram of a protection system of another energy feedback type traction power supply device provided by the invention;
fig. 6 is a schematic structural diagram of a protection system of another energy feedback type traction power supply device provided by the invention.
Detailed Description
The core of the invention is to provide a protection system of the energy feedback type traction power supply device, which avoids the damage of the energy feedback type traction power supply device caused by short circuit impact current and ensures the normal work of the energy feedback type traction power supply device; the invention further provides a rail transit power supply system.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a protection system of an energy feedback type traction power supply device provided in the present invention, including a protection module 1, a switch unit 2, and a monitoring module 3, wherein:
the first end of the switch unit 2 is connected with the direct current side of the energy feedback type traction power supply device, the second end of the switch unit 2 is connected with the direct current side of the protection module 1, the direct current side of the protection module 1 is connected with the direct current touch network, the alternating current side of the protection module 1 is connected with the alternating current side of the energy feedback type traction power supply device, and the common end of the protection module is connected with the three-phase alternating current network;
specifically, a schematic structural diagram of a common rail transit power supply system is shown in fig. 2, and includes an ac GIS (Gas Insulated Switchgear) switch cabinet having a first end connected to a three-phase ac power grid and a second end connected to a first end of a traction transformer, the second end of the traction transformer is connected to an ac side of a feedable traction power supply, a dc side of the feedable traction power supply is connected to a first end of a dc incoming switch cabinet, the second end of the dc incoming switch cabinet is connected to the first end of the dc feeder cabinet through a dc bus, the second end of the dc feeder cabinet is connected to a dc contact grid, the rail transit power supply system implements bidirectional conversion of electric energy between the ac side and the dc side through the feedable traction power supply, where the feedable traction power supply is generally a rectifier inverter, and the rectifier inverter can select a three-phase fully-controlled rectifier, the rectifying device in the rectifying inverter may be a power semiconductor switching device such as a GTO (Gate Turn-off Thyristor), an IGBT (Insulated Gate Bipolar Transistor), an IGCT (Integrated Gate-shared Thyristor), and may be formed in a two-level, three-level, or multi-level manner.
Correspondingly, referring to fig. 3, the protection system of the energy-feedback traction power supply device provided by the invention is applied to the rail transit power supply system, the switch unit 2 is arranged between the direct current side of the energy-feedback traction power supply device and the direct current incoming line switch cabinet, the protection module 1 is connected with the energy-feedback traction power supply device in parallel, the alternating current side of the protection module 1 and the alternating current side of the energy-feedback traction power supply device are connected to the traction transformer together, and the direct current side of the protection module 1 is connected with the switch unit 2 and the direct current incoming line switch cabinet respectively to provide a short-circuit impact current discharge path for the energy-feedback traction power supply device.
The monitoring module 3 is used for acquiring a first operating parameter of the direct current side of the protection module 1, judging whether the direct current side of the protection module 1 has a short-circuit fault according to the first operating parameter, if not, generating a first signal, and if so, generating a second signal;
the switch unit 2 is used for being switched on after receiving the first signal, and the energy feedback type traction power supply device controls the protection module 1 to be switched off from the rail transit power supply system; and the protection module is also used for switching off after receiving the second signal, so that the short circuit impact current on the direct current side of the protection module 1 is discharged to a direct current side short circuit point through the protection module 1.
As a preferred embodiment, the protection module 1 is a rectifier.
Generally, when the energy-feedback traction power supply device is connected to a rail transit power supply system, the protection module 1 is disconnected from the rail transit power supply system, where the disconnection means that the protection module 1 exits from the rail transit power supply system, and no energy flows from an alternating current side to a direct current side of the protection module 1. For example, if the protection module 1 is a rectifier, the rectifier is configured to convert three-phase ac power into dc power, assuming that the energy-fed traction power supply device is a three-phase fully-controlled rectifier in the rectification inverter, the protection module 1 is a three-phase diode uncontrollable device in the rectifier, the rectifier device in the three-phase fully-controlled rectifier may be a power switching device such as a thyristor, a GTO, an IGBT, an IGCT, and the like, taking the rectifier device as an IGBT, when the switching unit 2 is turned on, and the three-phase fully-controlled rectifier is connected to the rail transit power supply system, because the IGBT in the three-phase fully-controlled rectifier is controllable, the dc bus voltage in the rail transit power supply system may be raised to a value greater than the three-phase ac voltage at the ac side of the rail transit power supply system by controlling the IGBT, so that the voltage at the dc side of the three-phase diode uncontrollable device is higher than the voltage at the ac side thereof, it is ensured that no energy flows to the DC side of the three-phase diode through the AC side of the three-phase diode uncontrollable device.
Specifically, the monitoring module 3 obtains a first operating parameter of the dc side, and determines whether the dc side has a short-circuit fault according to the first operating parameter, where it can be understood that the first operating parameter is different, and the corresponding determination condition for determining whether the dc side has a short-circuit fault is also different. If the monitoring module 3 judges that the direct current side has no short-circuit fault, the monitoring module 3 always outputs a first signal to the switch unit 2, and the rail transit power supply system is ensured to realize the bidirectional conversion of electric energy between the alternating current side and the direct current side; if it is determined that a short-circuit fault exists on the direct-current side, the monitoring module 3 outputs a second signal to the switch unit 2, and at this time, because the switch unit 2 is disconnected, the energy-feedback traction power supply device exits the rail transit power supply system, the protection module 1 can normally work to provide a current release path for short-circuit impact current on the direct-current side, so that the energy-feedback traction power supply device is prevented from bearing the short-circuit impact current.
It can be understood that, at the same time, the voltage of one phase of the three-phase ac power network is high, the voltage of one phase is low, and when there is a short-circuit fault on the dc side, the short-circuit point on the dc side, the protection module 1, the phase with the lowest voltage of the three-phase ac power network, and the phase with the highest voltage of the three-phase ac power network form a current relief circuit, as shown in fig. 4, C is the phase with the lowest voltage of the three-phase ac power network, and a is the phase with the highest voltage of the three-phase ac power network.
Of course, the rectifier may be a three-phase diode uncontrolled rectifier, a two-phase rectifier, or other rectifiers capable of achieving the same function, and the invention is not limited herein.
In summary, the energy feedback type traction power supply device provided by the invention is connected with a set of protection system in parallel, when the direct current side of the rail transit power supply system normally works, no current flows through the protection module 1, and when the direct current side of the rail transit power supply system is short-circuited, the energy feedback type traction power supply device is cut out from the rail transit power supply system, so that short-circuit impact current is discharged to a direct current side short-circuit point through the protection module 1, and the energy feedback type traction power supply device is reliably protected.
The invention provides a protection system of an energy feedback type traction power supply device, which comprises a protection module, a switch unit and a monitoring module, wherein: the first end of the switch unit is connected with the direct current side of the energy feedback type traction power supply device, the second end of the switch unit is connected with the direct current side of the protection module, the direct current side of the protection module is connected with the direct current touch network, the alternating current side of the protection module is connected with the alternating current side of the energy feedback type traction power supply device, and the common end of the protection module is connected with the three-phase alternating current network; the monitoring module is used for acquiring a first operating parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault or not according to the first operating parameter, if not, generating a first signal, and if so, generating a second signal; the switch unit is used for being switched on after receiving the first signal, and the energy feedback type traction power supply device controls the protection module to be switched off from the rail transit power supply system; and the protection module is also used for switching off after receiving the second signal, so that the short circuit impact current on the direct current side of the protection module is discharged to a direct current side short circuit point through the protection module.
Therefore, in practical application, by adopting the scheme of the invention, when a short-circuit fault occurs on the direct current side of the protection module, the switch unit is controlled to be switched off through the monitoring module, the energy feedback type traction power supply device is switched out of the rail transit power supply system, the protection module provides a current discharge path, and short-circuit impact current on the direct current side of the energy feedback type traction power supply device is discharged to a direct current side short-circuit point through the discharge of the protection module, so that the energy feedback type traction power supply device is prevented from being damaged by the short-circuit impact current, and the normal work of the energy feedback type traction power supply device is ensured.
On the basis of the above-described embodiment:
as a preferred embodiment, the switching unit 2 is a power switching device.
As a preferred embodiment, the protection system further includes a turn-off module 4, configured to output a reverse voltage to the switching unit 2 after receiving the second signal, so as to control the switching unit 2 to turn off.
Specifically, when the switch unit 2 is a power switch device, such as a thyristor, an IGBT, a GTO, or other power switch devices, the turn-off modules 4 are also connected in parallel at two ends of the switch unit 2, as shown in fig. 5, when the turn-off modules 4 receive the second signal sent by the monitoring module 3, a reverse voltage is immediately output to the switch unit 2, so that the switch unit 2 is rapidly turned off, thereby ensuring that the regenerative traction power supply device can be rapidly switched out from the rail transit power supply system, and further improving the reliability of the protection system provided by the present invention.
Protection module 1 switch-off module 4 switch unit 2 as a preferred embodiment, the monitoring module 3 is further configured to:
and acquiring a second operation parameter of the direct current side of the protection module 1, judging whether the direct current side of the protection module 1 has a short-circuit fault according to the second operation parameter, if not, generating a first signal, and if so, generating a second signal.
Specifically, the second operation parameter of the direct current side of the protection module 1 is also obtained, which may also be regarded as obtaining operation parameters of two positions of the direct current side, that is, the first operation parameter is an operation parameter of a first position of the direct current side, and the second operation parameter is an operation parameter of a second position of the direct current side, which is a redundant operation.
In a preferred embodiment, the first operating parameter is a first current value and the second operating parameter is a second current value.
As a preferred embodiment, whether the protection module 1 has a short-circuit fault is determined according to the first operating parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically includes:
judging whether the first current value is larger than a first preset value or not, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists at the direct current side of the protection module 1 is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and judging whether the second current value is larger than the first preset value or not, if not, generating a first signal, and if so, generating a second signal.
As a preferred embodiment, whether a short-circuit fault exists at the dc side of the protection module 1 is determined according to the first operating parameter, if not, the first signal is generated, and if so, the process of generating the second signal specifically includes:
obtaining a first current change rate according to the first current value, judging whether the first current change rate is larger than a second preset value, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists at the direct current side of the protection module 1 is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and judging whether the second change rate is larger than a second preset value or not according to the second current change rate obtained by the second current, if not, generating a first signal, and if so, generating a second signal.
Specifically, the operation parameter may be a current value of the dc side, as shown in fig. 6, the first operation parameter is denoted as a first current value Idc1, the corresponding acquisition device is H1, the second operation parameter is denoted as a second current value Idc2, the corresponding acquisition device is H2, and taking the first current value Idc1 as an example, the monitoring module 3 may determine that the dc side has a short circuit condition, generally, the dc side has an excessively large or quickly changed current, which may indicate that the dc side has a short circuit fault, therefore, two methods may be adopted to determine, that is, first, whether the first current value is greater than a first preset value, if so, it indicates that the dc side has a short circuit fault, and when it determines that the dc side has a short circuit fault through the second current value Idc2, the same is true.
Of course, whether the direct current side has the short-circuit fault can be judged by other operation parameters and other methods besides the direct current side current value and the two methods, so that the actual engineering requirements can be met, and the method is not limited herein.
As a preferred embodiment, the protection system further comprises:
and the alarm module is used for sending an alarm after receiving the second signal.
Specifically, when the monitoring module 3 judges that the direct current side has a short-circuit fault, the monitoring module can send a second signal to the alarm module, and the alarm module can send an alarm after receiving the second signal so as to remind a worker to notice the condition of short-circuit impact current on the direct current side, and meanwhile, the worker can combine other operation parameters in the rail transit power supply system to judge whether the current rail transit power supply system needs manual intervention and adjustment, so that the safety of the protection system is further ensured.
Generally, the alarm module may be an indicator light or a buzzer, which is not limited in the present invention.
Correspondingly, the invention also provides a rail transit power supply system, which comprises the protection system of the energy feedback type traction power supply device.
For the introduction of the rail transit power supply system provided by the present invention, please refer to the above embodiments, and the present invention is not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a can present formula traction power supply unit's protection system which characterized in that, includes protection module, switch element, monitoring module, wherein:
the first end of the switch unit is connected with the direct current side of the energy-feedback traction power supply device, the second end of the switch unit is connected with the direct current side of the protection module, the direct current side of the protection module is connected with the direct current touch network, the alternating current side of the protection module is connected with the alternating current side of the energy-feedback traction power supply device, and the common end of the protection module and the energy-feedback traction power supply device is connected with a three-phase alternating current network;
the monitoring module is used for acquiring a first operating parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault according to the first operating parameter, if not, generating a first signal, and if so, generating a second signal;
the switch unit is used for being switched on after receiving the first signal, so that the energy feedback type traction power supply device controls the protection module and the rail transit power supply system to be switched off; the switch unit is further configured to turn off after receiving the second signal, so that the short-circuit impact current on the dc side of the protection module is discharged to the dc side short-circuit point through the protection module.
2. The protection system of an energy fed traction power supply according to claim 1, wherein the switching unit is a power switching device.
3. The protection system of an energy-fed traction power supply according to claim 1, wherein the protection module is a rectifier.
4. The protection system of the energy-fed traction power supply device according to claim 2, further comprising a turn-off module for outputting a reverse voltage to the switching unit after receiving the second signal to control the switching unit to turn off.
5. The protection system of the energy-fed traction power supply according to claim 1, wherein the monitoring module is further configured to:
and acquiring a second operation parameter of the direct current side of the protection module, judging whether the direct current side of the protection module has a short-circuit fault according to the second operation parameter, if not, generating the first signal, and if so, generating the second signal.
6. The protection system of an energy fed traction power supply according to claim 5, wherein the first operating parameter is a first current value and the second operating parameter is a second current value.
7. The protection system of the energy-fed traction power supply device according to claim 6, wherein the determining, according to the first operating parameter, whether a short-circuit fault exists at a direct-current side of the protection module, if not, generating a first signal, and if so, generating a second signal specifically includes:
judging whether the first current value is larger than a first preset value or not, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists on the direct-current side of the protection module is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and judging whether the second current value is larger than the first preset value or not, if not, generating the first signal, and if so, generating the second signal.
8. The protection system of the energy-fed traction power supply device according to claim 6, wherein the determining, according to the first operating parameter, whether a short-circuit fault exists at a direct-current side of the protection module, if not, generating a first signal, and if so, generating a second signal specifically includes:
obtaining a first current change rate according to the first current value, judging whether the first current change rate is larger than a second preset value, if not, generating a first signal, and if so, generating a second signal;
correspondingly, whether a short-circuit fault exists on the direct-current side of the protection module is judged according to the second operation parameter, if not, the first signal is generated, and if yes, the process of generating the second signal specifically comprises the following steps:
and obtaining a second current change rate according to the second current value, judging whether the second current change rate is greater than a second preset value, if not, generating the first signal, and if so, generating the second signal.
9. A protection system for an energy fed traction power supply according to any one of claims 1 to 8, further comprising:
and the alarm module is used for sending out an alarm after receiving the second signal.
10. A rail transit power supply system comprising a protection system for a feedable traction power supply according to any one of claims 1 to 9.
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| CN113644629A (en) * | 2021-07-19 | 2021-11-12 | 许继集团有限公司 | Short-circuit protection device for rail transit traction power supply bidirectional converter system and control method thereof |
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| CN102267405B (en) * | 2011-05-09 | 2013-11-06 | 株洲变流技术国家工程研究中心有限公司 | Energy feeding type dragging power supply device and control method thereof |
| WO2015121983A1 (en) * | 2014-02-14 | 2015-08-20 | 三菱電機株式会社 | Protection system for dc power transmission system, ac/dc converter, and dc power transmission system breaking method |
| CN204172712U (en) * | 2014-10-28 | 2015-02-25 | 株洲时代装备技术有限责任公司 | A kind of city rail medium-pressure type with circulation elimination function can present electric supply installation |
| CN105006805B (en) * | 2015-08-28 | 2017-08-25 | 广东美的制冷设备有限公司 | The overcurrent protective device and method of PFC pfc circuit |
| CN105226969B (en) * | 2015-10-28 | 2018-08-10 | 宁波市轨道交通集团有限公司 | Pressure energy feedback system and its method can be presented in power supply of city railway system twin coil access type |
| CN111211609B (en) * | 2016-02-05 | 2021-06-25 | Oppo广东移动通信有限公司 | Charging method, adapter and mobile terminal |
| CN206225994U (en) * | 2016-10-31 | 2017-06-06 | 广东美的制冷设备有限公司 | The overcurrent protective device and household electrical appliance of power factor corrector |
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