CN114094692A - Power supply system and method of transformer substation equipment - Google Patents
Power supply system and method of transformer substation equipment Download PDFInfo
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- CN114094692A CN114094692A CN202111363550.6A CN202111363550A CN114094692A CN 114094692 A CN114094692 A CN 114094692A CN 202111363550 A CN202111363550 A CN 202111363550A CN 114094692 A CN114094692 A CN 114094692A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention provides a power supply system and a power supply method for substation equipment, wherein the system comprises: the system comprises an alternating current power supply, a standby battery, electric equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group; the alternating current power supply is connected with the first alternating current-direct current conversion device through the first switch group and is connected with the second alternating current-direct current conversion device through the second switch group; the electric equipment is respectively connected with the standby battery, the first AC-DC conversion device and the second AC-DC conversion device. The first switch group is used for responding to the disconnection operation of a user, is in a disconnection state and triggers the standby battery to supply power; the second switch group is used for responding to the detection operation of a user and is placed in a closed state, so that the alternating current power supply supplies power when the output voltage of the second switch group is lower than the preset first voltage in the power supply process of the standby battery. By applying the system provided by the invention, the equipment can be used as the test load of the backup battery under the condition of ensuring power supply, and the test accuracy of the backup battery is improved.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a power supply system and method of substation equipment.
Background
A substation, in which various kinds of equipment are installed to maintain the operation of the substation, is one of important components in an electric power system. The guarantee of power supply for equipment in the transformer substation is one of important work for guaranteeing normal operation of the transformer substation.
At present, equipment in a transformer substation is usually powered by an alternating current power supply, and a standby battery is used for supplying power under the condition that the power supply of the alternating current power supply is abnormal. In order to ensure that the backup battery can normally supply power when the alternating-current power supply is abnormal, the backup battery is often manually charged and discharged through an additional load so as to detect the performance of the backup battery.
The inventor finds that additional loads used for testing are generally uniform in specification, and load consumption of the backup battery in actual power supply cannot be reduced through a mode of detecting the backup battery through the additional loads, so that testing accuracy is low.
Disclosure of Invention
In view of this, embodiments of the present invention provide a power supply system and a power supply method for substation equipment, so as to solve the problem that the existing power supply method cannot use the substation equipment as a detection load of a backup battery, and is difficult to accurately detect the performance of the backup battery.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a power supply system for substation equipment, comprising:
the system comprises an alternating current power supply, a standby battery, electric equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group;
the alternating current power supply is connected with each input end of the first alternating current-direct current conversion device through the first switch group, and the alternating current power supply is connected with each input end of the second alternating current-direct current conversion device through the second switch group;
the electric equipment is respectively connected with the standby battery, each output end of the first AC-DC conversion device and each output end of the second AC-DC conversion device;
the first switch group is used for responding to the disconnection operation of a user on the alternating current power supply in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, and placing the first switch group in a disconnection state to trigger the standby battery to supply power to the electric equipment;
the second ac-dc conversion device is configured to adjust an output voltage of the second ac-dc conversion device to a preset first voltage in response to a first voltage adjustment operation performed by the user on the second ac-dc conversion device, where the preset first voltage is a minimum operating voltage of the electrical equipment;
and the second switch group is used for responding to the detection operation of the standby battery by the user, and placing the second switch group in a closed state, so that the standby battery supplies power to the electric equipment, and when the output voltage of the standby battery is lower than the preset first voltage, the alternating current power supply supplies power to the electric equipment through the second alternating current-direct current conversion device.
Optionally, the second ac-dc conversion device is further configured to:
adjusting the output voltage of the second AC-DC conversion device to a preset second voltage in response to a second voltage adjusting operation of the user on the second AC-DC conversion device, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
and the second switch group is further configured to respond to a detection operation performed by the user on the second ac-dc conversion device in a process that the ac power supply supplies power to the electric equipment through the first ac-dc conversion device, and place the second switch group in a closed state to detect whether the ac power supply can supply power to the electric equipment through the second ac-dc conversion device.
In the above system, optionally, the ac power supply is a three-phase ac power supply.
In the above system, optionally, the first ac/dc conversion device includes a first ac/dc converter, a second ac/dc converter and a third ac/dc converter;
the first switch group comprises a first switch, a second switch and a third switch;
a first input end of the first alternating current/direct current converter is connected with a first phase line of the alternating current power supply through the first switch, and a second input end of the first alternating current/direct current converter is connected with a zero line of the alternating current power supply through the first switch;
a first input end of the second alternating current/direct current converter is connected with a second phase line of the alternating current power supply through the second switch, and a second input end of the second alternating current/direct current converter is connected with a zero line of the alternating current power supply through the second switch;
the first input end of the third alternating current/direct current converter is connected with a third phase line of the alternating current power supply through the third switch, and the second input end of the third alternating current/direct current converter is connected with a zero line of the alternating current power supply through the third switch.
In the above system, optionally, the second ac-dc conversion device includes a fourth ac/dc converter, and the second switch group includes a fourth switch;
the first input end of the fourth alternating current/direct current converter is connected with the first phase line of the alternating current power supply through the fourth switch, and the second input end of the fourth alternating current/direct current converter is connected with the zero line of the alternating current power supply through the fourth switch.
The above system, optionally, further comprises: a power distribution unit;
the standby battery, each output end of the first AC-DC conversion device and each output end of the second AC-DC conversion device are respectively connected with the electric equipment through the power distribution unit;
the power distribution unit is used for monitoring the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery.
The above system, optionally, further includes: a display device;
the power distribution unit is connected with the display device;
the display device is used for displaying the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery monitored by the power distribution unit.
A power supply method of substation equipment is applied to a power supply system of the substation equipment, and the system comprises an alternating current power supply, a standby battery, power equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group;
the method comprises the following steps:
in response to a first voltage regulation operation of a user on the second AC-DC conversion device, regulating the output voltage of the second AC-DC conversion device to a preset first voltage, wherein the preset first voltage is the minimum working voltage of the electric equipment;
in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, responding to the disconnection operation of a user on the alternating current power supply, and enabling the first switch group to be in a disconnection state so as to trigger the standby battery to supply power to the electric equipment;
and responding to the detection operation of the user on the standby battery, and placing the second switch group in a closed state so that the alternating current power supply supplies power to the electric equipment through the second alternating current-direct current conversion device when the output voltage of the standby battery is lower than the preset first voltage in the process that the standby battery supplies power to the electric equipment.
The above method, optionally, further includes:
in response to a second voltage adjustment operation of the user on the second AC-DC conversion device, adjusting the output voltage of the second AC-DC conversion device to a preset second voltage, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
and in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, responding to the detection operation of the user on the second alternating current-to-direct current conversion device, and putting the second switch group into a closed state to detect whether the alternating current power supply can supply power to the electric equipment through the second alternating current-to-direct current conversion device.
The above method, optionally, the system further includes a power distribution unit, and the method further includes:
monitoring the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery through the power distribution unit.
Based on the above power supply system for substation equipment provided by the embodiment of the present invention, the power supply system includes: the system comprises an alternating current power supply, a standby battery, electric equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group; the alternating current power supply is connected with each input end of the first alternating current-direct current conversion device through the first switch group, and the alternating current power supply is connected with each input end of the second alternating current-direct current conversion device through the second switch group; the electric equipment is respectively connected with the standby battery, each output end of the first AC-DC conversion device and each output end of the second AC-DC conversion device; the first switch group is used for responding to the disconnection operation of a user on the alternating current power supply in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-direct current conversion device, and the first switch group is in a disconnection state so as to trigger the standby battery to supply power to the electric equipment; the second AC-DC conversion device is used for responding to a first voltage regulation operation of a user on the second AC-DC conversion device and regulating the output voltage of the second AC-DC conversion device to a preset first voltage, wherein the preset first voltage is the minimum working voltage of the electric equipment; and the second switch group is used for responding to the detection operation of the user on the standby battery and placing the second switch group in a closed state so as to enable the alternating current power supply to supply power for the electric equipment through the second alternating current-direct current conversion device when the output voltage of the standby battery is lower than the preset first voltage in the process that the standby battery supplies power for the electric equipment. When the power supply system provided by the embodiment of the invention is applied, when the standby battery needs to be detected, the alternating current power supply which currently supplies power to the electric equipment can be disconnected through the first switch group, so that the standby battery supplies power to the electric equipment, the electric equipment is used as a test load of the standby battery, and when the output voltage of the standby battery cannot meet the power supply requirement of the electric equipment, the alternating current power supply can be triggered to supply power to the electric equipment through the second alternating current-direct current conversion device. Under the condition of ensuring the power supply of the electric equipment, the electric equipment can be used as a test load of the standby battery, and the test accuracy of the standby battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power supply system of a substation device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply system of a substation device according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a power supply system of a substation device according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for supplying power to substation equipment according to an embodiment of the present invention;
fig. 5 is a flowchart of another method of a power supply method for substation equipment according to an embodiment of the present invention;
fig. 6 is a schematic internal structural diagram of a chassis according to an embodiment of the present invention;
fig. 7 is a schematic front structural diagram of a chassis according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a cabinet according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The prior art can know that, in the existing power supply system of the transformer substation, an alternating current power supply and a backup battery are respectively connected with power utilization equipment of the transformer substation, the power utilization equipment is supplied with power by the alternating current power supply in a normal state, when the alternating current power supply cannot supply power normally, voltages at two ends of the power utilization equipment are reduced, and at the moment, the backup battery is triggered to start discharging to supply power for the power utilization equipment. In the existing power supply system, under the condition that power supply of the electric equipment is difficult to guarantee, the electric equipment is used as a test load of the standby battery, and accurate detection on the performance of the standby battery is not facilitated.
Therefore, the embodiment of the invention provides a power supply system of substation equipment, which can disconnect the existing power supply line of an alternating current power supply through a switch, so that a standby battery supplies power to electric equipment, and when the standby battery does not meet the power supply condition of the electric equipment, the alternating current power supply can be triggered to supply power to the electric equipment again. Under the condition of ensuring the power supply of the electric equipment, the electric equipment is used as the test load of the standby battery, and the test accuracy of the standby battery is improved.
An embodiment of the present invention provides a power supply system for substation equipment, where a system structure diagram of the system may be as shown in fig. 1, and the system includes:
an alternating current power supply 101, a backup battery 102, a first alternating current/direct current conversion device 103, a second alternating current/direct current conversion device 104, a first switch group 105, a second switch group 106, and a power consumer 107;
the ac power source 101 is connected to respective input terminals of the first ac/dc conversion device 103 through the first switch group 105, and the ac power source 101 is connected to respective input terminals of the second ac/dc conversion device 104 through the second switch group 106;
the electric equipment 107 is respectively connected with the backup battery 102, each output terminal of the first ac/dc conversion device 103, and each output terminal of the second ac/dc conversion device 104;
the first switch group 105 is configured to, in a process that the ac power source 101 supplies power to the electric device 107 through the first ac/dc conversion device 103, respond to a disconnection operation performed by a user on the ac power source 101, and place the first switch group 105 in a disconnected state to trigger the backup battery 102 to supply power to the electric device 107;
the second ac-dc conversion device 104 is configured to adjust an output voltage of the second ac-dc conversion device 104 to a preset first voltage in response to a first voltage adjustment operation performed by the user on the second ac-dc conversion device 104, where the preset first voltage is a minimum operating voltage of the electrical equipment 107;
the second switch group 106 is configured to, in response to a detection operation performed by the user on the backup battery 107, place the second switch group 106 in a closed state, so that when the output voltage of the backup battery 102 is lower than the preset first voltage in a process that the backup battery 102 supplies power to the electric device 107, the ac power supply 101 supplies power to the electric device 107 through the second ac/dc conversion device 104.
It should be noted that the schematic structure shown in fig. 1 provides a simple schematic diagram for better illustrating the embodiment of the present invention, and the diagram does not show a specific device structure, a specific port and a specific electrical connection structure, and does not limit the connection relationship in the practical application process.
In the system provided by the embodiment of the present invention, the electrical equipment 107 refers to a working equipment in a substation, and in a specific application process, a plurality of electrical equipments are set in the substation.
The first switch group 105 and the second switch group 105 provided in the embodiment of the present invention each include at least one switch, the specific number of the switches may be determined according to an actual circuit structure, and it is sufficient to open or close a line between an ac power source and the first ac-dc conversion device and the second ac-dc conversion device, where the closed state or the open state of the switch group means that each switch in the switch group is correspondingly in a closed state or correspondingly in an open state.
The first ac/dc conversion device 103 and the second ac/dc conversion device 104 each include at least one ac/dc converter, and the specific number of components may be determined according to an actual circuit structure, so that dc conversion of an ac power source may be achieved.
During the daily operation of the electric equipment 107, the first switch group 105 is in a closed state, the circuit between the alternating current 101 and the first ac/dc conversion device 103 and the electric equipment 107 is a path, and the electric equipment 107 is powered by the alternating current power supply 101. Specifically, the ac voltage output by the ac power supply 101 is input to the first ac/dc conversion device 103, and ac-dc conversion is performed by the first ac/dc conversion device 103 to output a dc voltage corresponding to the ac voltage output by the ac power supply 101, and the dc voltage output by the first ac/dc conversion device 103 supplies power to the electric device 107. The output voltage value of the first ac/dc conversion device 103 is the rated voltage value of the electric device 107.
During the daily operation of the electric equipment 107, the second switch group 106 is in an off state, that is, the circuit between the ac power source 101 and the second ac/dc conversion device 104 and the electric equipment 107 is broken, and the second ac/dc conversion device 104 does not have the input ac voltage and does not provide the dc voltage. The second ac/dc conversion device 104 is an adjustable ac/dc conversion device, wherein the ac/dc converter is an adjustable ac/dc converter, and the voltage value of the output voltage thereof can be adjusted.
When a user needs to detect the performance of the backup battery 102, the output voltage of the second ac/dc conversion device 104 may be adjusted first, and the output voltage is adjusted to the minimum operating voltage of the electric device. It should be noted that, in an actual application process, the output voltage value of the second ac/dc conversion device 104 may be maintained at the minimum operating voltage, rather than being adjusted each time. After the adjustment is completed, the user may close the second switch group 106 to make the circuit between the ac power source 101 and the second ac/dc conversion device 104 and the electric device 107 become a path. According to the power supply characteristics of the direct current voltage, the power supply device with the highest voltage value in the voltage sources supplies power. When the output voltage of the first ac/dc conversion device 103 or the backup battery 102 is higher than the minimum operating voltage of the electric device 107, the output voltage of the second ac/dc conversion device 104 is lower than the output voltage of the other electric power output devices and is not supplied with power therefrom.
When the output voltage value of the second ac/dc conversion device 104 is the minimum operating voltage of the electrical equipment and the second switch group 106 is closed, the user may open the first switch group 105 and open the circuit for supplying power to the ac power source 101 through the first ac/dc conversion device 103, and this operation may gradually decrease the output voltage of the first ac/dc conversion device 103, which may not meet the power supply requirement of the electrical equipment 107. The circuit between the backup battery 102 and the electric device is a path, and when the output voltage of the backup battery 102 is higher than the output voltage of the first ac/dc conversion device 103, the electric device 107 is powered by the backup battery 102. At this time, the electric equipment 107 becomes a discharge load of the backup battery 102, and the detection device can measure a discharge characteristic curve of the backup battery 102 during the power feeding of the backup battery 102 to detect the performance of the backup battery 102.
In the process that the backup battery 102 supplies power to the electric equipment 107, if the backup battery 102 has abnormal performance or the electric quantity is consumed, when the output voltage of the backup battery 102 is lower than the minimum operating voltage of the electric equipment, the output voltage of the second ac/dc conversion device 104 is the maximum output voltage in the system, and at this time, the voltage converted and output by the ac power source 101 through the second ac/dc conversion device 104 supplies power to the electric equipment 107, so as to guarantee the power supply of the electric equipment 107.
Based on the system provided by the embodiment of the invention, when a user needs to detect the standby battery in the transformer substation, the second switch group can be closed, so that a power supply path with the minimum working voltage exists between the alternating current power supply and the electric equipment. And then the first switch group is disconnected to disconnect the original power supply path of the alternating current power supply and trigger the standby battery to supply power for the electric equipment. When the output voltage of the standby battery is lower than the minimum working voltage of the electric equipment, the alternating current power supply can supply power to the electric equipment through the power supply path corresponding to the second switch group. By applying the system provided by the embodiment of the invention, the electric equipment can be used as the test load of the standby battery under the condition of ensuring the power supply of the substation equipment, the performance of the standby battery is detected under the condition that the standby battery supplies power to the electric equipment, the discharge test of the standby battery is not manually performed by adopting an additional load, the discharge scene of the standby battery in the actual use process can be restored, and the test accuracy of the standby battery is favorably improved.
Further, on the basis of the system provided in the foregoing embodiment, in the system provided in the embodiment of the present invention, the second ac/dc conversion device is further configured to:
responding to a second voltage adjusting operation of the user on the second AC-DC conversion device, and adjusting the output voltage of the second AC-DC conversion device to a preset second voltage, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
and the second switch group is further configured to respond to a detection operation performed by the user on the second ac-dc conversion device in a process that the ac power supply supplies power to the electric equipment through the first ac-dc conversion device, and place the second switch group in a closed state to detect whether the ac power supply can supply power to the electric equipment through the second ac-dc conversion device.
In the system provided by the embodiment of the invention, before detecting the backup battery, a user can detect the performance of the second ac/dc conversion device under the condition that the ac power supply normally supplies power to the electric equipment, that is, whether the device can work normally is detected, and when there is an input ac voltage, whether the input ac voltage can be converted into a corresponding dc voltage for output.
The user can firstly adjust the output voltage of the second ac-dc conversion device to a preset second voltage, the second voltage is higher than the output voltage of the first ac-dc conversion device in the system, the output voltage of the first ac-dc conversion device is usually the rated voltage of the electric equipment, and the second voltage is not higher than the maximum working voltage of the electric equipment, that is, the second voltage is a preset voltage within a range which is greater than the rated voltage of the electric equipment and less than the maximum working voltage of the electric equipment.
In the system provided in the embodiment of the present invention, when both the first ac/dc conversion device and the second ac/dc conversion device are in the operating state, the output voltage set by the second ac/dc conversion device is higher than the output voltage of the first ac/dc conversion device, and if the first ac/dc conversion device can operate normally, the voltage output by the first ac/dc conversion device in the current system supplies power to the electric device according to the power supply characteristic of the dc voltage.
When the output voltage value of the second ac/dc conversion device is set to the second voltage, the user may close the second switch group, so that the circuit between the ac power source and the second ac/dc conversion device and the electric device is a path. Whether the alternating current power supply can supply power for the electric equipment through the second alternating current-direct current device can be detected by judging whether the voltage output by the second alternating current-direct current conversion device currently supplies power for the electric equipment. Specifically, the working voltages at the two ends of the electric device may be obtained, whether the working voltages are matched with the output voltage value of the second ac-dc conversion device or not is determined, and if the working voltages are matched with the output voltage value of the second ac-dc conversion device, it is determined that the ac power supply can supply power through the second ac-dc conversion device, otherwise, the ac power supply cannot supply power.
Based on the system provided by the embodiment of the invention, the second AC/DC conversion device can be detected before the first switch group is disconnected and the standby battery is triggered to supply power, and the standby battery is triggered to supply power for detection under the condition that the second AC/DC conversion device meets the test condition of normal power supply. The situation that the second AC/DC conversion device breaks down can be avoided, the standby battery is used for supplying power, and therefore when the standby battery cannot normally supply power, the AC power supply cannot supply power through the second AC/DC conversion device, normal power utilization of electric equipment is guaranteed, and reliability of power supply is improved.
Further, on the basis of the system provided by the above embodiment, the ac power supply in the system provided by the embodiment of the present invention is a three-phase ac power supply.
To better explain the method provided by the embodiment of the present invention, on the basis of the system provided by the above embodiment, with reference to the schematic structural diagram shown in fig. 2, the embodiment of the present invention provides another power supply system for substation equipment, as shown in fig. 2, the first ac/dc conversion device in the system provided by the embodiment of the present invention includes a first ac/dc converter 201, a second ac/dc converter 202, and a third ac/dc converter 203;
the first switch group includes a first switch S1, a second switch S2, and a third switch S3;
a first input end of the first ac/dc converter 201 is connected to a first phase line C of the ac power source through the first switch S1, and a second input end of the first ac/dc converter 201 is connected to a neutral line N of the ac power source through the first switch S1;
a first input end of the second ac/dc converter 202 is connected to a second phase line B of the ac power source through the second switch S2, and a second input end of the second ac/dc converter 202 is connected to a neutral line N of the ac power source through the second switch S2;
a first input end of the third ac/dc converter 203 is connected to the third phase line a of the ac power supply through the third switch S3, and a second input end of the third ac/dc converter 203 is connected to the neutral line N of the ac power supply through the third switch S4.
In the system provided by the embodiment of the invention, the alternating current power supply is a three-phase alternating current power supply, and as shown in fig. 2, A, B and C respectively represent three phase lines of the alternating current power supply, and N represents a zero line of the alternating current power supply. AC/DC denotes an AC/DC converter. The rightmost AC/DC converter 204(AC/DC) is the second AC/DC conversion device in the system provided by the embodiment of the present invention. V denotes a backup battery in the embodiment of the present invention. In the system provided by the embodiment of the present invention, each output terminal of each ac/dc conversion device (that is, each output terminal of each ac/dc converter in each ac/dc conversion device) and the backup battery are connected to the power consumption device 205 through the dc bus. The positive pole of the standby battery is connected with the positive bus in the direct current busbar, and the negative pole of the standby battery is connected with the negative bus in the direct current busbar.
Further, on the basis of the system provided by the foregoing embodiment, as shown in fig. 2, in the system provided by the embodiment of the present invention, the second ac/dc converting apparatus includes a fourth ac/dc converter 204, and the second switch group includes a fourth switch S4;
a first input end of the fourth ac/dc converter 204 is connected to the first phase line C of the ac power source through the fourth switch S4, and a second input end of the fourth ac/dc converter 204 is connected to the neutral line N of the ac power source through the fourth switch S4.
In the power supply system provided by the embodiment of the invention, the positive output end of each alternating current/direct current converter is connected with the positive bus of the direct current bus bar, and the negative output end of each alternating current/direct current converter is connected with the negative bus of the direct current bus bar. One end of the electric equipment 205 is connected with the positive bus of the dc bus bar, and the other end is connected with the negative bus of the dc bus bar.
In the system provided in the embodiment of the present invention, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all double-pole single-throw switches, when the switches are turned off, two input terminals corresponding to the ac/dc converter may be simultaneously disconnected from the ac power supply, and when the switches are turned off, two corresponding input terminals may be simultaneously connected to the ac power supply.
In the system provided by the embodiment of the present invention, the fourth ac/dc converter 204 is an output-adjustable ac/dc converter, while the first ac/dc converter 201, the second ac/dc converter 202, and the third ac/dc converter 203 may be fixed-output ac/dc converters, and the output voltage of each ac/dc converter in the first ac/dc conversion device may be fixed to the rated operating voltage of the electric equipment.
For example, since the rated operating voltage of the electric device is 54 volts, the first ac/dc converter 201, the second ac/dc converter 202, and the third ac/dc converter 203 may be ac/dc converters having an output voltage of 54 volts. The fourth ac/dc converter 204 may be an adjustable ac/dc converter with a regulation range of 44 v to 57 v. The preset first voltage may be set to 44 volts and the preset second voltage may be set to 57 volts.
It should be noted that, the schematic structure shown in fig. 2 is only to better illustrate a specific embodiment provided by the system according to the embodiment of the present invention, and the schematic structure of some devices in the system is only shown in the drawing, which is only to further illustrate the contents of the ac power supply, the first ac/dc conversion device, the second ac/dc conversion device, and the like in the system provided by the embodiment of the present invention, and is not to limit the device structure in the practical application process. In the specific implementation process, various types of circuit elements, such as resistors, capacitors, and the like, are also disposed in the actual circuit to ensure the operation of the circuit, which is not specifically described in the embodiments of the present invention, and such device structures are not shown in fig. 2.
To better explain the system provided by the embodiment of the present invention, on the basis of the system shown in fig. 1, in combination with the schematic structural diagram shown in fig. 3, the system provided by the embodiment of the present invention further includes: a power distribution unit 108;
the backup battery 102, the output terminals of the first ac/dc conversion device 103, and the output terminals of the second ac/dc conversion device 104 are respectively connected to the electric devices 107 through the power distribution unit 108;
the power distribution unit 108 is configured to monitor an output voltage of the first ac-dc conversion device 103, an output voltage of the second ac-dc conversion device 104, and an output voltage of the backup battery 102.
The system provided by the embodiment of the invention is also provided with a power distribution unit for detecting the output voltage of each power supply device in the system so as to monitor the power supply state of the power supply system in real time. A Power Distribution Unit (PDU) refers to a Power Distribution socket for a cabinet, is a product designed to provide Power Distribution for electrical equipment installed in the cabinet, can provide real-time Power monitoring, and realizes automatic alarm protection, and is an existing device, which is not described in detail herein.
It should be noted that the transmission branches of the power distribution unit 108 are independent from each other, and the structure shown in fig. 3 is only a brief schematic illustration. Each input of the power distribution unit 108 corresponds to one output to the electric device, for example, the output voltage of the first ac/dc conversion device 103 is still output to the electric device 107 through the power distribution unit 108. The input voltage signals of the power distribution unit 108 have no mutual influence.
Based on the system provided by the embodiment of the invention, the output voltage of each power output device can be monitored through the power distribution unit, the power supply condition of the system can be conveniently and quickly obtained, an alarm can be given in time when abnormality occurs, the reliability of power supply of the device can be further improved, and the use experience of a user can also be improved.
Further, on the basis of the system provided by the above embodiment, the system provided by the embodiment of the present invention further includes: a display device;
the power distribution unit is connected with the display device;
the display device is used for displaying the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery monitored by the power distribution unit.
The system provided by the embodiment of the invention is provided with the display device, the display device can be connected with the power distribution unit, the output voltages of the first AC-DC conversion device, the second AC-DC conversion device and the standby battery, which are monitored by the power distribution unit in real time, are read, and the read voltage values are displayed in real time in a display interface of the display device.
According to the system provided by the embodiment of the invention, the output voltage values of the power output devices can be displayed in real time through the display device, so that a user can conveniently learn the power supply condition of the system, and the use experience of the user is further improved.
Based on the power supply method for the substation equipment provided by the embodiment of the present invention, the embodiment of the present invention further provides a power supply method for the substation equipment, which corresponds to the power supply system for the substation equipment shown in fig. 1, and the power supply method for the substation equipment provided by the embodiment of the present invention is applied to the power supply system for the substation equipment, where the system includes an ac power supply, a backup battery, a power consumption device, a first ac/dc conversion device, a second ac/dc conversion device, a first switch group, and a second switch group;
the method flowchart of the method is shown in fig. 4, and includes:
s301: in response to a first voltage regulation operation of a user on the second AC-DC conversion device, regulating the output voltage of the second AC-DC conversion device to a preset first voltage, wherein the preset first voltage is the minimum working voltage of the electric equipment;
in the method provided by the embodiment of the invention, under the condition that the alternating current power supply supplies power through the first alternating current-direct current conversion device, a user can adjust the output voltage of the second alternating current-direct current conversion device in the power supply system, and adjust the output voltage to the minimum working voltage of the electric equipment.
S302: in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-direct current conversion device, in response to the disconnection operation of a user on the alternating current power supply, the first switch group is switched off to trigger the standby battery to supply power to the electric equipment;
in the method provided by the embodiment of the invention, when a user needs to detect the standby battery, the first switch group can be switched off, so that the circuits among the alternating current power supply, the first alternating current/direct current conversion device and the electric equipment are in an open circuit, and the standby battery in the system can be triggered to supply power to the electric equipment. The performance of the electric equipment can be detected in the process that the standby battery supplies power to the electric equipment.
S303: and responding to the detection operation of the user on the standby battery, and placing the second switch group in a closed state so that the alternating current power supply supplies power to the electric equipment through the second alternating current-direct current conversion device when the output voltage of the standby battery is lower than the preset first voltage in the process that the standby battery supplies power to the electric equipment.
In the method provided by the embodiment of the present invention, before detecting the backup battery, that is, before disconnecting the first switch group, or while disconnecting the first switch group, the second switch group needs to be in a closed state, so that the circuit among the ac power supply, the second ac/dc conversion device, and the electric device is in an on state. In the process of supplying power by the standby battery, if the output voltage of the standby battery is higher than the minimum working voltage of the electric equipment, the system is supplied with power by the standby battery, and when the output voltage of the standby battery is lower than the minimum voltage of the electric equipment, the system is supplied with power by the alternating current power supply.
Based on the method provided by the embodiment of the invention, when a user needs to detect the standby battery in the transformer substation, the second switch group can be closed, so that a power supply path with the minimum working voltage exists between the alternating current power supply and the electric equipment. And then the first switch group is disconnected to disconnect the original power supply path of the alternating current power supply and trigger the standby battery to supply power for the electric equipment. When the output voltage of the standby battery is lower than the minimum working voltage of the electric equipment, the alternating current power supply can supply power to the electric equipment through the power supply path corresponding to the second switch group. By applying the method provided by the embodiment of the invention, the electric equipment can be used as the test load of the standby battery under the condition of ensuring the power supply of the substation equipment, the performance of the standby battery is detected under the condition that the standby battery supplies power to the electric equipment, the discharge test of the standby battery is not manually carried out by adopting an additional load, the discharge scene of the standby battery in the actual use process can be reduced, and the test accuracy of the standby battery is favorably improved.
To better explain the method provided by the embodiment of the present invention, in combination with the flowchart shown in fig. 5, on the basis of the method provided by the above embodiment, the method provided by the embodiment of the present invention further includes:
s401: in response to a second voltage adjustment operation of the user on the second AC-DC conversion device, adjusting the output voltage of the second AC-DC conversion device to a preset second voltage, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
in the method provided by the embodiment of the invention, before detecting the standby battery, a user can firstly detect the second ac-dc conversion device in the power supply system, and can adjust the output voltage of the second ac-dc conversion device to a preset voltage higher than the output voltage of the first ac-dc conversion device.
S402: and in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, responding to the detection operation of the user on the second alternating current-to-direct current conversion device, and putting the second switch group into a closed state to detect whether the alternating current power supply can supply power to the electric equipment through the second alternating current-to-direct current conversion device.
In the method provided by the embodiment of the invention, when the output voltage of the second ac/dc conversion device is the second voltage, a user may detect the second ac/dc conversion device, so that the second switch group in the power supply system is in a closed state, so that circuits among the ac power supply, the second ac/dc conversion device, and the electric equipment are in an on state, and detect whether the ac power supply can supply power to the electric equipment through the second ac/dc conversion device, so as to determine whether the performance of the second ac/dc conversion device is good.
Based on the method provided by the embodiment of the invention, the second AC-DC conversion device in the power supply system can be further detected, so that the second AC-DC conversion device can work normally under the condition of supplying power by a standby battery, and the power supply of electric equipment is ensured.
Further, on the basis of the method provided by the above embodiment, in the method provided by the embodiment of the present invention, the power supply system further includes a power distribution unit, and in the method provided by the embodiment of the present invention, the method further includes:
monitoring, by the power distribution unit, an output voltage of the first ac-dc conversion device, an output voltage of the second ac-dc conversion device, and an output voltage of the backup battery.
In the method provided by the embodiment of the present invention, the output ends of the power output devices such as the first ac/dc conversion device, the second ac/dc conversion device, and the standby battery may be connected to the power consumption device through the power distribution unit. The output voltage of each power output device can be monitored through the power distribution unit, and automatic alarm can be given when abnormality occurs.
In order to better describe the power supply system and method for substation equipment provided by the embodiment of the present invention, on the basis of the system shown in fig. 1, with reference to fig. 6 to 8, the embodiment of the present invention further briefly describes the practical application of the power supply system for substation equipment.
In an actual application process, part of devices in the power supply system provided by the embodiment of the invention can be integrated in the chassis to work. As shown in fig. 6, the internal structure of the chassis may be schematically illustrated, a backup battery 501 and a backup battery 502 may be disposed in the chassis, and the backup battery 501 and the backup battery 502 are redundant backup power sources. A controller 503, a breaker (air switch) 504, a breaker (air switch) 505, a dc bus bar 506, a fan 507 and a fan 508 are also arranged in the chassis. In addition, some connection components and devices arranged as required are also arranged in the case, and are not described in detail here.
It should be noted that the structure shown in fig. 6 is only a brief schematic illustration, and does not show a detailed structure of a specific device, during a specific application process, the devices in the chassis may be connected by wires, and the wire structure is not shown in fig. 6.
As shown in the front structural diagram of fig. 7, the front of the chassis may be provided with a plurality of ventilation holes, and a control panel, a user may perform corresponding settings through keys on the control panel, and a screen in the control panel may display a corresponding setting interface, may be used to display a discharge characteristic curve of the backup battery, and the like.
Further, the chassis (such as the chassis shown in fig. 6 and 7) for loading the backup battery and other devices with box-type structures may be disposed in the cabinets, and one cabinet may be disposed with the related devices of the power supply system corresponding to a plurality of electric devices.
The device setting situation in the cabinet can be as shown in fig. 8, the cabinet is provided with two monitoring devices of Power Distribution Units (PDUs) from top to bottom, the voltage situation of the PDUs is monitored, and control switches for monitoring the corresponding outputs of the PDUs are provided, for example, as shown in fig. 8, on the panel of the PDU, switches a1, a2, A3 and a4 corresponding to output a, and switches B1, B2, B3 and B4 corresponding to output B are monitored. An indicator light is further arranged above each switch, and prompting effects such as alarming can be achieved through lamplight. The control panel of the monitoring device is also provided with a display screen and a control key, and the monitoring device can be correspondingly set.
The cabinet is provided with a main body device corresponding to the PDU, and a control panel thereof is provided with control switches for controlling respective outputs of the PDU, and as shown in fig. 8, the switches a1, a2, A3, a4, B1, B2, B3, and B4 on the panel corresponding to the power distribution unit. It should be noted that, in the structure shown in fig. 8, the switches on the device panel for monitoring the PDU and the switches on the device panel for the power distribution unit use the same identifier name, which is to set a name for a signal channel of the power distribution unit for convenience of control in an actual application scenario, and the switches using the same identifier name on different panels are not the same switch.
Two cabinets for holding the backup batteries are also provided in the cabinet, which are the cabinets shown in fig. 6 and 7.
The cabinet is also provided with a ring motion monitoring terminal which refers to a class of terminals for monitoring the operation of equipment.
In an actual application scenario, a plurality of cabinets as shown in fig. 8 may be disposed in a substation to monitor power supply conditions of each electrical device in the substation. It should be noted that the cabinet structure shown in fig. 8 is only a specific embodiment of deploying devices by using a cabinet type structure, where the types of the devices and the number of the devices can be determined according to actual application requirements, and other devices can be set in the cabinet as needed, without affecting the functions of the system or the method provided in the embodiment of the present invention.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
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. A power supply system of a substation device, characterized by comprising:
the system comprises an alternating current power supply, a standby battery, electric equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group;
the alternating current power supply is connected with each input end of the first alternating current-direct current conversion device through the first switch group, and the alternating current power supply is connected with each input end of the second alternating current-direct current conversion device through the second switch group;
the electric equipment is respectively connected with the standby battery, each output end of the first AC-DC conversion device and each output end of the second AC-DC conversion device;
the first switch group is used for responding to the disconnection operation of a user on the alternating current power supply in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, and placing the first switch group in a disconnection state to trigger the standby battery to supply power to the electric equipment;
the second ac-dc conversion device is configured to adjust an output voltage of the second ac-dc conversion device to a preset first voltage in response to a first voltage adjustment operation performed by the user on the second ac-dc conversion device, where the preset first voltage is a minimum operating voltage of the electrical equipment;
and the second switch group is used for responding to the detection operation of the standby battery by the user, and placing the second switch group in a closed state, so that the standby battery supplies power to the electric equipment, and when the output voltage of the standby battery is lower than the preset first voltage, the alternating current power supply supplies power to the electric equipment through the second alternating current-direct current conversion device.
2. The system of claim 1, wherein the second ac/dc conversion device is further configured to:
responding to a second voltage adjusting operation of the user on the second AC-DC conversion device, and adjusting the output voltage of the second AC-DC conversion device to a preset second voltage, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
and the second switch group is further configured to respond to a detection operation performed by the user on the second ac-dc conversion device in a process that the ac power supply supplies power to the electric equipment through the first ac-dc conversion device, and place the second switch group in a closed state to detect whether the ac power supply can supply power to the electric equipment through the second ac-dc conversion device.
3. The system of claim 1, wherein the ac power source is a three-phase ac power source.
4. The system of claim 3, wherein the first AC/DC conversion device comprises a first AC/DC converter, a second AC/DC converter and a third AC/DC converter;
the first switch group comprises a first switch, a second switch and a third switch;
a first input end of the first alternating current/direct current converter is connected with a first phase line of the alternating current power supply through the first switch, and a second input end of the first alternating current/direct current converter is connected with a zero line of the alternating current power supply through the first switch;
a first input end of the second alternating current/direct current converter is connected with a second phase line of the alternating current power supply through the second switch, and a second input end of the second alternating current/direct current converter is connected with a zero line of the alternating current power supply through the second switch;
the first input end of the third alternating current/direct current converter is connected with a third phase line of the alternating current power supply through the third switch, and the second input end of the third alternating current/direct current converter is connected with a zero line of the alternating current power supply through the third switch.
5. The system of claim 3, wherein the second AC-DC conversion device comprises a fourth AC/DC converter, and the second switch set comprises a fourth switch;
the first input end of the fourth alternating current/direct current converter is connected with the first phase line of the alternating current power supply through the fourth switch, and the second input end of the fourth alternating current/direct current converter is connected with the zero line of the alternating current power supply through the fourth switch.
6. The system of claim 1, further comprising: a power distribution unit;
the standby battery, each output end of the first AC-DC conversion device and each output end of the second AC-DC conversion device are respectively connected with the electric equipment through the power distribution unit;
the power distribution unit is used for monitoring the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery.
7. The system of claim 6, further comprising: a display device;
the power distribution unit is connected with the display device;
the display device is used for displaying the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery monitored by the power distribution unit.
8. The method is characterized by being applied to a power supply system of the substation equipment, wherein the system comprises an alternating current power supply, a standby battery, electric equipment, a first alternating current-direct current conversion device, a second alternating current-direct current conversion device, a first switch group and a second switch group;
the method comprises the following steps:
in response to a first voltage adjusting operation of a user on the second AC-DC conversion device, adjusting the output voltage of the second AC-DC conversion device to a preset first voltage, wherein the preset first voltage is the minimum working voltage of the electric equipment;
in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, responding to the disconnection operation of a user on the alternating current power supply, and enabling the first switch group to be in a disconnection state so as to trigger the standby battery to supply power to the electric equipment;
and responding to the detection operation of the user on the standby battery, and placing the second switch group in a closed state so that the alternating current power supply supplies power to the electric equipment through the second alternating current-direct current conversion device when the output voltage of the standby battery is lower than the preset first voltage in the process that the standby battery supplies power to the electric equipment.
9. The method of claim 8, further comprising:
in response to a second voltage adjustment operation of the user on the second AC-DC conversion device, adjusting the output voltage of the second AC-DC conversion device to a preset second voltage, wherein the preset second voltage is higher than the output voltage of the first AC-DC conversion device;
and in the process that the alternating current power supply supplies power to the electric equipment through the first alternating current-to-direct current conversion device, responding to the detection operation of the user on the second alternating current-to-direct current conversion device, and putting the second switch group into a closed state to detect whether the alternating current power supply can supply power to the electric equipment through the second alternating current-to-direct current conversion device.
10. The method of claim 8, wherein the system further comprises a power distribution unit, the method further comprising:
monitoring the output voltage of the first AC-DC conversion device, the output voltage of the second AC-DC conversion device and the output voltage of the standby battery through the power distribution unit.
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| CN202111363550.6A CN114094692B (en) | 2021-11-17 | 2021-11-17 | Power supply system and method for substation equipment |
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| CN113285518A (en) * | 2021-04-12 | 2021-08-20 | 中广核研究院有限公司 | DC power supply system |
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| CN114094692B (en) | 2023-08-18 |
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