CN111371170A - Direct current power supply - Google Patents
Direct current power supply Download PDFInfo
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- CN111371170A CN111371170A CN202010097464.4A CN202010097464A CN111371170A CN 111371170 A CN111371170 A CN 111371170A CN 202010097464 A CN202010097464 A CN 202010097464A CN 111371170 A CN111371170 A CN 111371170A
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- power supply
- direct current
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- power
- voltage
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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
- H02J9/061—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 DC powered loads
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
Abstract
The application relates to the technical field of direct current power supply of transformer substations, in particular to a direct current power supply for preventing direct current buses of transformer substations from losing voltage, which comprises: the output voltage value of the first power supply module is smaller than the normal power supply voltage value of the second direct current bus and larger than zero, the second switch unit disconnects the first power supply module from the second direct current bus, and when the second direct current bus is abnormally powered, the first power supply module supplies power to the second direct current bus through the second switch unit; the output voltage value of the second power supply module is smaller than the normal power supply voltage value of the first direct current bus and larger than zero, the first switch unit disconnects the second power supply module from the first direct current bus, and when the first direct current bus is abnormally powered, the second power supply module supplies power to the first direct current bus through the first switch unit.
Description
Technical Field
The application relates to the technical field of direct current power supply of transformer substations, in particular to a direct current power supply.
Background
When the transformer substation normally works, some direct current power supply equipment such as a direct current movement device, a relay protection device, a communication device and the like need to be used, and a direct current power supply system is required to be provided for supplying power in the transformer substation.
When a traditional direct-current power supply system for a substation normally operates, I, II sections of direct-current buses operate in a row, each group of chargers is powered by two paths of alternating-current power supplies at the same time and outputs direct-current power supplies to operate a direct-current load of the substation, and meanwhile, the chargers float charge a storage battery pack. When the alternating current input power supply of the charger loses power completely, the storage battery of the transformer substation supplies power to the total-station direct current load. However, when the ac input power of the charger is lost and the battery pack is open-circuited, the dc bus loses voltage, so that the devices such as the relay protection device, the motion device, and the communication device, which are powered by the dc power system, lose power, and cause the faults such as locking of the relay protection device, stopping of the motion device, and interruption of communication, which seriously threatens the operation safety of the transformer substation and the power grid.
Moreover, the storage battery pack of the transformer substation is in a charge-discharge state for a long time, and the aging phenomenon is inevitably generated after the storage battery pack is operated for a long time, and the phenomena of falling off of terminals and polar plates and the like are likely to occur in the normal operation process, so that the internal open circuit of the storage battery is caused, and the phenomenon can not be found by people generally.
Disclosure of Invention
In view of the above, it is necessary to provide a dc power supply capable of avoiding voltage loss of a dc bus when a charger fails to supply ac power and a battery pack is open.
The application provides a DC power supply for prevent transformer substation's direct current bus decompression includes:
the output end of the first power supply module is connected with a second direct current bus and used for supplying power to the second direct current bus when the power supply of the second direct current bus is abnormal;
the output end of the second power supply module is connected with the first direct current bus and used for supplying power to the first direct current bus when the power supply of the first direct current bus is abnormal;
the first switch unit is connected between the output end of the second power supply module and the input end of the first direct current bus in series;
the second switch unit is connected between the output end of the first power supply module and the input end of the first direct current bus in series;
the output voltage value of the first power supply module is smaller than the normal power supply voltage value of the second direct current bus and larger than zero, so that the second switch unit disconnects the first power supply module from the second direct current bus, and when the second direct current bus is abnormally powered, the first power supply module supplies power to the second direct current bus through the second switch unit; the output voltage value of the second power supply module is smaller than the normal power supply voltage value of the first direct current bus and larger than zero, so that the first switch unit disconnects the second power supply module from the first direct current bus, and when the first direct current bus is abnormally powered, the second power supply module supplies power to the first direct current bus through the first switch unit.
In the dc power supply in the above embodiment, a first power module is connected to a second dc bus through a second switch unit, and an output voltage value of the first power module is smaller than a normal power supply voltage value of the second dc bus and larger than zero, so that the second switch unit disconnects the first power module from the second dc bus, and when the second dc bus is abnormally powered, the first power module supplies power to the second dc bus through the second switch unit. When the charger connected with the second direct current bus has an alternating current fault and the storage battery pack has an open circuit fault, the voltage of the second direct current bus is zero, the output voltage value of the first power supply module is larger than zero, so that the second switch unit is switched on, and the first power supply module supplies power to the second direct current bus through the second switch unit, so that the phenomenon that when the charger connected with the second direct current bus has an alternating current fault and the storage battery pack has an open circuit fault, the second direct current bus loses voltage to cause the power failure or the fault of a device supplied with power through the second direct current bus is avoided. Similarly, a second power module is connected with a first direct current bus through a first switch unit, and the output voltage value of the second power module is smaller than the normal power supply voltage value of the first direct current bus and larger than zero, so that the first switch unit disconnects the second power module from the first direct current bus, and when the first direct current bus is abnormally powered, the second power module supplies power to the first direct current bus through the first switch unit. When the charger connected with the first direct current bus has an alternating current fault and the storage battery pack has an open circuit fault, the voltage of the first direct current bus is zero, the output voltage value of the second power module is larger than zero, so that the first switch unit is switched on, and the second power module supplies power to the first direct current bus through the first switch unit, so that the situation that when the charger connected with the first direct current bus has the alternating current fault and the storage battery pack has the open circuit fault, the first direct current bus loses voltage to cause the power failure or the fault of a device powered through the first direct current bus is avoided.
In one embodiment, the first power module comprises:
the first voltage reduction unit is used for reducing the input direct current voltage value to a preset first voltage value and outputting the first voltage value;
and the first voltage regulating unit is connected in series between the output end of the first voltage reducing unit and the input end of the second switching unit and used for outputting a first regulating voltage value, and the first regulating voltage value belongs to a preset first range interval.
In the dc power supply in the above embodiment, a first voltage-reducing unit and a first voltage-regulating unit are arranged in series in the first power module, the first voltage-reducing unit is configured to reduce an input dc voltage value to a preset first voltage value for output, the first voltage-regulating unit is connected in series between an output end of the first voltage-reducing unit and an input end of the second switching unit, and is configured to output a first regulating voltage value belonging to a preset first range interval, so that a voltage value between the input end of the first voltage-reducing unit and the output end of the first voltage-regulating unit is greater than zero and smaller than a normal power supply voltage value of the second dc bus, when an ac fault occurs in a charger connected to the second dc bus and an open-circuit fault occurs in a storage battery pack, the second dc bus voltage is zero, and the output voltage value of the first power module is greater than zero, so that the second switching unit is turned on, the first power supply module supplies power to the second direct current bus through the second switch unit, and therefore the situation that when a charger connected with the second direct current bus has an alternating current fault and a storage battery pack has an open circuit fault, the second direct current bus loses voltage to cause power failure or fault of a device powered through the second direct current bus is avoided.
In one embodiment, the second power module comprises:
the second voltage reduction unit is used for reducing the input direct current voltage value to a preset second voltage value and outputting the second voltage value;
and the second voltage regulating unit is connected in series between the output end of the second voltage reducing unit and the input end of the first switching unit and used for outputting a second regulating voltage value, and the second regulating voltage value belongs to a preset second range interval.
In the dc power supply in the above embodiment, a second voltage-reducing unit and a second voltage-regulating unit are arranged in the second power module, and are connected in series, where the second voltage-reducing unit is configured to reduce an input dc voltage value to a preset second voltage value for output, and the second voltage-regulating unit is connected in series between an output end of the second voltage-reducing unit and an input end of the first switch unit, and is configured to output a second regulating voltage value belonging to a preset second range interval, so that a voltage value between the input end of the second voltage-reducing unit and an output end of the second voltage-regulating unit is greater than zero and smaller than a normal supply voltage value of the first dc bus. When the charger connected with the first direct current bus has an alternating current fault and the storage battery pack has an open circuit fault, the voltage of the first direct current bus is zero, the output voltage value of the second power module is larger than zero, so that the first switch unit is switched on, and the second power module supplies power to the first direct current bus through the first switch unit, so that the situation that when the charger connected with the first direct current bus has the alternating current fault and the storage battery pack has the open circuit fault, the first direct current bus loses voltage to cause the power failure or the fault of a device powered through the first direct current bus is avoided.
In one embodiment, the first power module includes a first temperature sensor connected to the first switch unit, and the first temperature sensor is configured to detect a temperature value of the first switch unit, so as to avoid a situation that the first switch unit cannot normally operate due to an excessively high temperature of the first switch unit.
In one embodiment, the second power module includes a second temperature sensor connected to the second switch unit, and the second temperature sensor is configured to detect a temperature value of the second switch unit. The situation that the second switch unit cannot work normally due to overhigh temperature of the second switch unit is avoided.
In one embodiment, the first power module includes a first current divider connected to the output terminal of the second power module, and the first current divider is configured to collect the output current value of the second power module.
In one embodiment, the second power module includes a second current divider connected to the output terminal of the first power module, and the second current divider is configured to collect the output current value of the first power module.
In one embodiment, the first power module includes a first display panel for displaying at least one of an output voltage value of the first power module and the second power module, an output current value of the first power module, and a temperature value of the first switch unit, so that a user can visually see at least one of the output voltage value of the first power module and the second power module, the output current value of the first power module, and the temperature value of the first switch unit through the first display panel.
In one embodiment, the second power module includes a second display panel for displaying at least one of an output voltage value of the first power module and the second power module, an output current value of the second power module, and a temperature value of the second switching unit. So that a user can visually see at least one parameter of the output voltage values of the first power module and the second power module, the output current value of the second power module, and the temperature value of the second switch unit through the second display panel.
In one embodiment, the dc power supply further includes a third switching unit and a fourth switching unit, the third switching unit is configured to connect the first power supply module and the first dc bus to charge the first power supply module through the first dc bus; and the fourth switching unit is used for connecting the second power supply module with the second direct current bus so as to charge the second power supply module through the second direct current bus.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain drawings of other embodiments based on these drawings without any creative effort.
Fig. 1 is a schematic circuit diagram of a dc power supply provided in a first embodiment of the present application.
Fig. 2 is a schematic circuit diagram of a dc power supply provided in a second embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a dc power supply provided in a third embodiment of the present application.
Fig. 4 is a schematic circuit diagram of a dc power supply provided in a fourth embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In a dc power supply 100 provided in an embodiment of the present application, a dc substation bus voltage loss prevention device, as shown in fig. 1, includes a first power module 30, a second power module 40, a first switch unit 50, and a second switch unit 60. The output end of the first power module 30 is connected with the second dc bus 20, and is used for supplying power to the second dc bus 20 when the power supply of the second dc bus 20 is abnormal; the output end of the second power module 40 is connected with the first dc bus 10, and is used for supplying power to the first dc bus 10 when the power supply of the first dc bus 10 is abnormal; the first switching unit 50 is connected in series between the output end of the second power module 40 and the input end of the first dc bus 10; the second switching unit 60 is connected in series between the output end of the first power module 30 and the input end of the second dc bus 20; the output voltage value of the first power module 30 is smaller than the normal power supply voltage value of the second dc bus 20 and larger than zero, so that the second switch unit 60 disconnects the first power module 30 from the second dc bus 20, and when the power supply of the second dc bus 20 is abnormal, the first power module 30 supplies power to the second dc bus 20 through the second switch unit 60; the output voltage value of the second power module 40 is smaller than the normal power supply voltage value of the first dc bus 10 and larger than zero, so that the first switch unit 50 disconnects the second power module 40 from the first dc bus 10, and when the first dc bus 10 is abnormal in power supply, the second power module 40 supplies power to the first dc bus 10 through the first switch unit 50.
Specifically, in the dc power supply 100 in the above embodiment, the first power module 30 is connected to the second dc bus 20 through the second switch unit 60, and the output voltage value of the first power module 30 is smaller than the normal power supply voltage value of the second dc bus 20 and larger than zero, so that the second switch unit 60 disconnects the first power module 30 from the second dc bus 20, and when the power supply of the second dc bus 20 is abnormal, the first power module 30 supplies power to the second dc bus 20 through the second switch unit 60. When the charger connected with the second dc bus 20 has an ac fault and the storage battery pack has an open-circuit fault, the voltage value of the second dc bus 20 is zero, the output voltage value of the first power module 30 is greater than zero, so that the second switch unit 60 is turned on, and the first power module 30 supplies power to the second dc bus 20 through the second switch unit 60, thereby avoiding that the device supplying power through the second dc bus 20 is powered off or fails due to voltage loss of the second dc bus 20 when the charger connected with the second dc bus 20 has an ac fault and the storage battery pack has an open-circuit fault. Similarly, the second power module 40 is connected to the first dc bus 10 through the first switch unit 50, and the output voltage value of the second power module 40 is smaller than the normal power supply voltage value of the first dc bus 10 and greater than zero, so that the first switch unit 50 disconnects the second power module 40 from the first dc bus 10, and when the first dc bus 10 is abnormally powered, the second power module 40 powers the first dc bus 10 through the first switch unit 50. When the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault, the voltage of the first dc bus 10 is zero, the output voltage value of the second power module 40 is greater than zero, so that the first switch unit 50 is turned on, and the second power module 40 supplies power to the first dc bus 10 through the first switch unit 50, thereby avoiding that the device supplying power through the first dc bus 10 is powered off or fails due to voltage loss of the first dc bus 10 when the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault.
More specifically, in the case that the first dc bus 10 supplies power normally, it may be provided that the first power module 30 may be charged through the first dc bus 10 by being connected to the first dc bus 10; in the case that the second dc bus 20 supplies power normally, the second power module 40 may be configured to be connected to the second dc bus 20 to charge the battery through the second dc bus 20. When an alternating current fault occurs in a charger connected with the first outgoing line direct current bus 10 and an open circuit fault occurs in a storage battery pack, the voltage value of the first direct current bus 10 is reduced to zero or close to zero, and the second power module 40 replaces the first direct current bus 10 to supply power for equipment of the transformer substation which needs to be supplied with power by a direct current power supply system. When an alternating current fault occurs in a charger connected with the second direct current bus 20 and an open circuit fault occurs in the storage battery, the voltage value of the second direct current bus 20 is reduced to zero or close to zero, and the first power module 30 replaces the second direct current bus 20 to supply power to equipment of the transformer substation which needs to be supplied with power by the direct current power supply system.
In the dc power supply in the above embodiment, by providing the first power module and the second power module, when the voltage-loss fault occurs in the first dc bus, the second power module replaces the first dc bus by the first switch unit to provide the dc power, and when the voltage-loss fault occurs in the second dc bus, the first power module replaces the second dc bus by the second switch unit to provide the dc power, which avoids that the power supply equipment of the first dc bus and/or the second dc bus stops operating or fails to cause economic loss and adverse effect under the condition of the voltage-loss fault.
Further, in a dc power supply provided in an embodiment of the present application, for preventing a substation dc bus from losing voltage, as shown in fig. 2, a first power module 30 includes a first voltage-reducing unit 31 and a first voltage-regulating unit 32 connected in series, where the first voltage-reducing unit 31 is configured to reduce an input dc voltage value to a preset first voltage value and output the reduced input dc voltage value; the first voltage regulating unit 32 is connected in series between the output end of the first voltage reducing unit 31 and the input end of the second switching unit 60, and is configured to output a first regulating voltage value belonging to a preset first range interval.
Specifically, in the dc power supply in the above embodiment, by arranging the first voltage-reducing unit 31 and the first voltage-regulating unit 32 connected in series in the first power module 30, the first voltage-reducing unit 31 is configured to reduce an input dc voltage value to a preset first voltage value for output, and the first voltage-regulating unit 32 is connected in series between an output end of the first voltage-reducing unit 31 and an input end of the second switch unit 60 for outputting a first regulating voltage value belonging to a preset first range, so that a voltage value between the input end of the first voltage-reducing unit 31 and the output end of the first voltage-regulating unit 32 is greater than zero and smaller than a normal power supply voltage value of the second dc bus 20. When the charger connected with the second dc bus has an ac fault and the storage battery pack has an open-circuit fault, the voltage of the second dc bus 20 is zero, the output voltage value of the first power module 30 is greater than zero, so that the second switch unit 60 is turned on, and the first power module 30 supplies power to the second dc bus 20 through the second switch unit 60, thereby avoiding that the second dc bus 20 loses voltage to cause power failure or fault of a device supplied with power through the second dc bus 20 when the charger connected with the second dc bus 20 has an ac fault and the storage battery pack has an open-circuit fault.
Further, in a dc power supply provided in an embodiment of the present application, for preventing a substation dc bus from losing voltage, as shown in fig. 2, the second power module 40 includes a second voltage-reducing unit 41 and a second voltage-regulating unit 42 connected in series, where the second voltage-reducing unit 41 is configured to reduce an input dc voltage value to a preset second voltage value and output the reduced dc voltage value; the second voltage regulating unit 42 is connected in series between the output terminal of the second voltage reducing unit 41 and the input terminal of the first switching unit 50, and is configured to output a second regulating voltage value belonging to a preset second range interval.
Specifically, in the dc power supply in the above embodiment, by providing the second voltage-reducing unit 41 and the second voltage-regulating unit 42 connected in series in the second power module 40, the second voltage-reducing unit 41 is configured to reduce the input dc voltage value to the preset second voltage value for output, and the second voltage-regulating unit 42 is connected in series between the output end of the second voltage-reducing unit 41 and the input end of the first switch unit 50 for outputting the second regulated voltage value belonging to the preset second range, so that the voltage value between the input end of the second voltage-reducing unit 41 and the output end of the second voltage-regulating unit 42 is greater than zero and smaller than the normal power supply voltage value of the first dc bus 10. When the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault, the voltage of the first dc bus 10 is zero, the output voltage value of the second power module 40 is greater than zero, so that the first switch unit 50 is turned on, and the second power module 40 supplies power to the first dc bus 10 through the first switch unit 50, thereby avoiding that the device supplying power through the first dc bus is powered off or fails due to voltage loss of the first dc bus 10 when the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault.
Further, in a dc power supply provided in an embodiment of the present application, for preventing a dc bus of a substation from losing voltage, as shown in fig. 3, the first power module 30 includes a first temperature sensor 70, the first temperature sensor 70 is connected to the first switch unit 50, and the first temperature sensor 70 is configured to detect a temperature value of the first switch unit 50, so as to avoid a situation that the first switch unit 50 cannot normally operate due to an excessively high temperature thereof.
Further, in the direct current power supply in the above embodiment, as shown in fig. 3, the second power module 40 includes a second temperature sensor 80, the second temperature sensor 80 is connected to the second switch unit 60, and the second temperature sensor 80 is configured to detect a temperature value of the second switch unit 60. The situation that the second switch unit 60 cannot work normally due to the fact that the temperature of the second switch unit is too high is avoided.
Further, in a dc power supply provided in an embodiment of the present application, for preventing the dc bus of the substation from losing voltage, as shown in fig. 4, the first power module 30 includes a first current divider 90, the first current divider 90 is connected to the output end of the second power module, and the first current divider 90 is used for acquiring the output current value of the second power module 40.
Further, in the direct current power supply in the above embodiment, as shown in fig. 4, the second power module 40 includes a second current divider 91, the second current divider 91 is connected to the output end of the first power module 30, and the second current divider 91 is configured to collect the output current value of the first power module 30.
Further, in the direct current power supply in the above embodiment, as shown in fig. 4, the first power module 30 includes a first display panel 33 for displaying at least one of the output voltage values of the first power module 30 and the second power module 40, the output current value of the first power module 30, and the temperature value of the first switch unit 50, so that a user can visually see at least one of the output voltage values of the first power module 30 and the second power module 40, the output current value of the first power module 30, and the temperature value of the first switch unit 50 through the first display panel 33.
Further, in the dc power supply in the above embodiment, as shown in fig. 4, the second power module 40 includes a second display panel 43, and the second display panel 43 is used for displaying at least one of the output voltage values of the first power module 30 and the second power module 40, the output current value of the second power module 40, and the temperature value of the second switch unit 60. So that the user can visually see at least one of the output voltage values of the first and second power modules 30 and 40, the output current value of the second power module 40, and the temperature value of the second switching unit 60 through the second display panel 43.
Further, in the direct current power supply in the above embodiment, as shown in fig. 4, the direct current power supply further includes a third switching unit 34 and a fourth switching unit 44, where the third switching unit 34 is configured to connect the first power module 30 and the first direct current bus 10, so as to charge the first power module 30 through the first direct current bus 10; the fourth switching unit 44 is used for connecting the second power module 40 and the second dc bus 20 to charge the second power module 40 through the second dc bus 20.
Specifically, in the dc power supply in the above embodiment, as shown in fig. 4, the output voltage value of the first voltage-reducing module 31 may be set to be 51V, the output voltage value of the first voltage-regulating module 32 may be set to be 53V-57V, and the voltage dividing value of the first voltage-reducing module 31 and the first voltage-regulating module 32 together is set to be 104V-108V; the output voltage value of the second voltage reduction module 41 can be set to be 51V, the output voltage value of the second voltage regulation module 42 can be set to be 53V-57V, and the common voltage division value of the second voltage reduction module 41 and the second voltage regulation module 42 is set to be 104V-108V; the normal supply voltage values of the first direct current bus 10 and the second direct current bus 20 are set to be 110V respectively. In the present embodiment, the first switch unit 50 and the second switch unit 60 are preferably configured as diodes, and in the case that the first dc bus 10 and the second dc bus 20 are normally powered, since the output voltage values of the first power module 30 and the second power module 40 are both less than 110V, the first switch unit 50 and the second switch unit 60 are in a reverse blocking state. When the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault, the voltage of the first dc bus 10 is zero, the output voltage value of the second power module 40 is greater than zero, so that the first switch unit 50 is turned on, and the second power module 40 supplies power to the first dc bus 10 through the first switch unit 50, thereby avoiding that the device supplying power through the first dc bus is powered off or fails due to voltage loss of the first dc bus 10 when the charger connected with the first dc bus 10 has an ac fault and the storage battery pack has an open-circuit fault. When the charger connected with the second dc bus 20 has an ac fault and the storage battery pack has an open-circuit fault, the voltage of the second dc bus 20 is zero, the output voltage value of the first power module 30 is greater than zero, so that the second switch unit 60 is turned on, and the first power module 30 supplies power to the second dc bus 20 through the second switch unit 60, thereby avoiding that the second dc bus 20 loses voltage to cause power failure or fault of a device supplied with power through the second dc bus 20 when the charger connected with the second dc bus 20 has an ac fault and the storage battery pack has an open-circuit fault.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a direct current power supply for prevent transformer substation's direct current bus decompression, its characterized in that includes:
the output end of the first power supply module is connected with a second direct current bus and used for supplying power to the second direct current bus when the power supply of the second direct current bus is abnormal;
the output end of the second power supply module is connected with the first direct current bus and used for supplying power to the first direct current bus when the power supply of the first direct current bus is abnormal;
the first switch unit is connected between the output end of the second power supply module and the input end of the first direct current bus in series;
the second switch unit is connected between the output end of the first power supply module and the input end of the first direct current bus in series;
the output voltage value of the first power supply module is smaller than the normal power supply voltage value of the second direct current bus and larger than zero, so that the second switch unit disconnects the first power supply module from the second direct current bus, and when the second direct current bus is abnormally powered, the first power supply module supplies power to the second direct current bus through the second switch unit; the output voltage value of the second power supply module is smaller than the normal power supply voltage value of the first direct current bus and larger than zero, so that the first switch unit disconnects the second power supply module from the first direct current bus, and when the first direct current bus is abnormally powered, the second power supply module supplies power to the first direct current bus through the first switch unit.
2. The dc power supply of claim 1, wherein the first power module comprises:
the first voltage reduction unit is used for reducing the input direct current voltage value to a preset first voltage value and outputting the first voltage value;
and the first voltage regulating unit is connected in series between the output end of the first voltage reducing unit and the input end of the second switching unit and used for outputting a first regulating voltage value, and the first regulating voltage value belongs to a preset first range interval.
3. The dc power supply of claim 1, wherein the second power module comprises:
the second voltage reduction unit is used for reducing the input direct current voltage value to a preset second voltage value and outputting the second voltage value;
and the second voltage regulating unit is connected in series between the output end of the second voltage reducing unit and the input end of the first switching unit and used for outputting a second regulating voltage value, and the second regulating voltage value belongs to a preset second range interval.
4. The dc power supply of claim 1, wherein the first power module comprises:
and the first temperature sensor is connected with the first switch unit and used for detecting the temperature value of the first switch unit.
5. The dc power supply of claim 1, wherein the second power module comprises:
and the second temperature sensor is connected with the second switch unit and used for detecting the temperature value of the second switch unit.
6. The dc power supply of claim 1, wherein the first power module comprises:
and the first current divider is connected with the output end of the second power supply module and used for acquiring the output current value of the second power supply module.
7. The dc power supply of claim 1, wherein the second power module comprises:
and the second current divider is connected with the output end of the first power supply module and used for acquiring the output current value of the first power supply module.
8. The dc power supply of claim 1, wherein the first power module comprises:
the first display panel is used for displaying at least one of output voltage values of the first power supply module and the second power supply module, output current values of the first power supply module and temperature values of the first switch unit.
9. The dc power supply of claim 1, wherein the second power module comprises:
and the second display panel is used for displaying at least one of the output voltage values of the first power supply module and the second power supply module, the output current value of the second power supply module and the temperature value of the second switch unit.
10. The direct current power supply according to any one of claims 1 to 9, further comprising:
a third switching unit for connecting the first power module and the first dc bus to charge the first power module through the first dc bus;
and the fourth switching unit is used for connecting the second power supply module and the second direct current bus so as to charge the second power supply module through the second direct current bus.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010097464.4A CN111371170A (en) | 2020-02-17 | 2020-02-17 | Direct current power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010097464.4A CN111371170A (en) | 2020-02-17 | 2020-02-17 | Direct current power supply |
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| CN111371170A true CN111371170A (en) | 2020-07-03 |
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