CN110601351A - Dual-power seamless switching device and method - Google Patents
Dual-power seamless switching device and method Download PDFInfo
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- CN110601351A CN110601351A CN201910909830.9A CN201910909830A CN110601351A CN 110601351 A CN110601351 A CN 110601351A CN 201910909830 A CN201910909830 A CN 201910909830A CN 110601351 A CN110601351 A CN 110601351A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
The invention discloses a double-power supply seamless switching device and a double-power supply seamless switching method. The automatic switching device, the power supply line switch, the maintenance switch group, the transformer, the rectifying device, the inverting device and the controller are arranged between the double power supplies and the external sensitive load, so that the controller can control the transient voltage supporting device to output rated alternating voltage after detecting that the electric energy quality of the original power supply does not meet the requirement and in the process of successfully switching to another power supply meeting the requirement, thereby ensuring that the sensitive load of the double power supply system can still normally supply power in the power supply switching process, and solving the problem that the normal power supply of the sensitive load is influenced in the power supply switching process of the existing double power supply system.
Description
Technical Field
The invention relates to the technical field of power system control, in particular to a double-power supply seamless switching device and method.
Background
Some sensitive loads in the power system (such as power equipment loads adopted by hospitals, semiconductor manufacturing plants, government agencies and the like) have higher requirements on the quality of electric energy; when voltage sag and other problems occur, personal safety and normal work of the production line cannot be guaranteed. At present, the reliability of power supply is improved mainly by adopting dual power supplies, and when the original first power supply has the power quality problems such as voltage sag and the like, the switch is quickly switched to act, and another normal power supply supplies power to a sensitive load. However, the detection and operation of the fast switch in the dual power supply mode require a certain time. Before the quick change-over switch is successfully operated, the power supply of the sensitive load cannot be guaranteed. Therefore, it is necessary to solve the problem that the dual power supply system affects the normal power supply of the sensitive load during the power switching process.
Disclosure of Invention
The invention aims to provide a double-power supply seamless switching device and a double-power supply seamless switching method, which are used for solving the problem that the normal power supply of a sensitive load is influenced in the power supply switching process of the conventional double-power supply system.
In order to achieve the purpose, the invention provides the following scheme:
a dual-power seamless switching device, comprising: the system comprises a double power supply, an automatic switching device, a power supply line switch, a maintenance switch group, a transformer, a rectifying device, an inverter device and a controller; the dual power supply includes a first power supply and a second power supply; the maintenance switch group comprises a first maintenance switch, a second maintenance switch and a third maintenance switch; the transformer comprises a first transformer and a second transformer; the rectifying device comprises a first rectifying device and a second rectifying device;
the automatic switching device comprises a first power supply connecting end, a second power supply connecting end and a switching control end; the first power supply is connected with the first power supply connecting end; the second power supply is connected with the second power supply connecting end; the switching control end is connected with the first power supply connecting end or the second power supply connecting end; one end of the power supply line switch is connected with the switching control end, and the other end of the power supply line switch is connected with an external sensitive load; one end of the first transformer is connected with the first power supply through the second maintenance switch; the other end of the first transformer is connected with one end of the first rectifying device; the other end of the first rectifying device is connected with one end of the inverter; one end of the second transformer is connected with the second power supply through the third maintenance switch; the other end of the second transformer is connected with one end of the second rectifying device; the other end of the second rectifying device is connected with one end of the inverter; the other end of the inverter is connected with one end of the first maintenance switch; the other end of the first maintenance switch is connected with the sensitive load; the controller is respectively connected with the first power supply connecting end, the second power supply connecting end, the switching control end, the power supply line switch and the maintenance switch group.
Optionally, the automatic switching device is an automatic transfer switch ATSE or a solid state transfer switch SSTS.
Optionally, the power supply line switch is composed of two anti-parallel first thyristors and two anti-parallel second thyristors; the first thyristor and the second thyristor are respectively connected with the controller.
Optionally, the first maintenance switch, the second maintenance switch and the third maintenance switch in the maintenance switch group are normally closed switches.
Optionally, the dual-power seamless switching device further includes a bypass switch; the bypass switch is connected with the power supply line switch in parallel; the bypass switch is also connected to the controller.
A double-power seamless switching method is based on the double-power seamless switching device; the dual-power seamless switching method comprises the following steps:
when the switching control end of the automatic switching device is connected with the first power supply connecting end, the controller collects a first power supply voltage at the first power supply connecting end and a second power supply voltage at the second power supply connecting end;
the controller judges whether the first power supply voltage meets the power quality requirement of an external sensitive load or not to obtain a first judgment result;
if the first judgment result is that the first power supply voltage does not meet the power quality requirement of the sensitive load, the controller judges whether the second power supply voltage meets the power quality requirement of the sensitive load or not to obtain a second judgment result;
if the second judgment result is that the second power supply voltage meets the power quality requirement of the sensitive load, the controller turns off a power supply line switch and controls an inverter to output rated alternating-current voltage, and the sensitive load is supplied with power by a second power supply through a second transformer, a second rectifying device and the inverter; meanwhile, the controller switches the automatic switching device to a state that the switching control end is connected with the second power supply connecting end;
when the automatic switching device is switched to a state that the switching control end is connected with the second power supply connecting end, the controller closes the power supply line switch, controls the output current of the inverter to be zero, and supplies power to the sensitive load through the second power supply via the power supply line switch.
Optionally, the dual power seamless switching method further includes:
when the switching control end of the automatic switching device is connected with the second power supply connecting end, the controller collects a first power supply voltage at the first power supply connecting end and a second power supply voltage at the second power supply connecting end;
the controller judges whether the second power supply voltage meets the power quality requirement of the external sensitive load or not, and obtains a third judgment result;
if the third judgment result is that the second power supply voltage does not meet the power quality requirement of the sensitive load, the controller judges whether the first power supply voltage meets the power quality requirement of the sensitive load or not, and a fourth judgment result is obtained;
if the fourth judgment result shows that the first power supply voltage meets the power quality requirement of the sensitive load, the controller turns off a power supply line switch and controls an inverter to output rated alternating-current voltage, and the sensitive load is supplied with power by a first power supply through a first transformer, a first rectifying device and the inverter; meanwhile, the controller switches the automatic switching device to a state that the switching control end is connected with the first power supply connecting end;
when the automatic switching device is switched to a state that the switching control end is connected with the first power supply connecting end, the controller closes the power supply line switch, controls the output current of the inverter to be zero, and supplies power to the sensitive load through the power supply line switch by the first power supply.
Optionally, the dual power seamless switching method further includes:
the controller detects whether the power supply circuit switch is in a normal working state or not, and a fifth judgment result is obtained;
if the fifth judgment result is that the power supply line switch is in a normal working state, the controller controls the bypass switch to be in a disconnected state;
and if the fifth judgment result shows that the power supply line switch is not in a normal working state, the controller controls the bypass switch to be closed.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a double-power supply seamless switching device and a double-power supply seamless switching method, wherein an automatic switching device, a power supply line switch, an overhaul switch group, a transformer, a rectifying device, an inverter device and a controller are arranged between double power supplies and an external sensitive load, so that the controller outputs rated alternating voltage by controlling the inverter device after detecting that the electric energy quality of an original power supply does not meet the requirement and in the process of successfully switching to another power supply meeting the requirement, and temporarily puts another power supply meeting the requirement into the power supply to supply power for the sensitive load, thereby ensuring that the sensitive load of a double-power supply system can still normally supply power in the power supply switching process, and solving the problem that the normal power supply of the sensitive load is influenced in the power supply switching process of the conventional.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings provided by the present invention without any creative effort.
Fig. 1 is a schematic structural diagram of a dual power seamless switching device provided by 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.
The invention aims to provide a double-power supply seamless switching device and a double-power supply seamless switching method, which are used for ensuring that a sensitive load of a double-power supply system can still normally supply power in the power supply switching process.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a dual power seamless switching device provided by the present invention. Referring to fig. 1, the dual power seamless switching device provided by the invention comprises: the system comprises a double power supply, an automatic switching device, a power supply line switch, a maintenance switch group, a transformer, a rectifying device, an inverter device 12 and a controller 13.
In order to ensure reliable power supply of the sensitive load, the invention adopts a double-power supply form to supply power to the sensitive load, and the double-power supply comprises a first power supply I and a second power supply II. The sensitive load is generally connected with the first power supply I or the second power supply II through a power supply line switch and an automatic switching device.
The automatic switching device comprises a first power supply connecting end 1, a second power supply connecting end 2 and a switching control end 3. The power supply line switch comprises a first thyristor 4 and a second thyristor 5 which are connected in series at the inlet line of the sensitive load power supply line in an anti-parallel mode. And a bypass switch 6 is connected in parallel at two ends of the first thyristor 4 and the second thyristor 5. The transformer comprises a first transformer 8 and a second transformer 9. The fairing includes a first fairing 10 and a second fairing 11. The service switch group includes a first service switch 7, a second service switch 14, and a third service switch 15.
As shown in fig. 1, the first power source I is connected to the first power source connection terminal 1; and the second power supply II is connected with the second power supply connecting end 2. The switching control terminal 3 is connected to the first power connection terminal 1 or the second power connection terminal 2. One end of the power supply line switch is connected with the switching control end 3, and the other end of the power supply line switch is connected with an external sensitive load.
One end of the first transformer 8 is connected to the first power source I through the second service switch 14. The other end of the first transformer 8 is connected to one end of the first rectifying device 10. The other end of the first rectifying device 10 is connected to one end of the inverter device 12.
One end of the second transformer 9 is connected with the second power supply II through the third maintenance switch 15. The other end of the second transformer 9 is connected to one end of the second rectifying device 11. The other end of the second rectifying device 11 is connected to one end of the inverter device 12.
The other end of the inverter 12 is connected with one end of the first maintenance switch 7. The other end of the first service switch 7 is connected with the sensitive load. The sensitive load is generally, but not limited to, a load of electric power equipment employed in hospitals, semiconductor manufacturing plants, government offices, and the like.
The controller 13 is respectively connected with the first power connection end 1, the second power connection end 2, the switching control end 3, the power supply line switch (including the first thyristor 4 and the second thyristor 5), the bypass switch 6 and the maintenance switch group (including the first maintenance switch 7, the second maintenance switch 14 and the third maintenance switch 15).
Typically, the automatic switching device is an automatic transfer switch ATSE or a solid state transfer switch SSTS, but is not limited thereto. The automatic Transfer Switching equipment (atse) is an electrical apparatus for monitoring power supply circuits (such as voltage loss, overvoltage, undervoltage, phase failure, and frequency deviation), and automatically Switching one or more load circuits from one power supply to another power supply. The switching time is usually in the order of seconds, which is approximately 1s to 5s, using a mechanical switch such as ATSE. SSTS (solid State Transfer switch), namely a solid-state switch, can also be quickly switched from one power supply to another power supply, and the time is about 20ms to 100 ms.
Therefore, the detection and the action of the automatic switching device ATSE or SSTS both need a certain time, and the power supply of the sensitive load cannot be guaranteed before the rapid switching switch successfully acts. Therefore, it is necessary to solve the problem that the dual power supply system affects the normal power supply of the sensitive load during the power switching process. According to the invention, the non-energy-storage transient voltage supporting device is switched between the dual-power supply system and the external sensitive load, so that the problem that the dual-power supply system influences the normal power supply of the sensitive load in the power supply switching process is solved.
Specifically, the power supply line switch is composed of a first thyristor 4 and a second thyristor 5 which are connected in anti-parallel; the first thyristor 4 and the second thyristor 5 are connected in series at the line inlet for supplying power to the sensitive load in an anti-parallel mode.
The bypass switch 6 is connected in parallel with the first thyristor 4 and the second thyristor 5 and is in an off state when the thyristors are not failed. Specifically, the bypass switch 6 in the present invention is in the off state when the first thyristor 4 and the second thyristor 5 work normally, and when the first thyristor 4 or the second thyristor 5 has a fault, the bypass switch 6 will replace the thyristor and be controlled by the corresponding signal.
In the maintenance switch group first maintenance switch 7 second maintenance switch 14 with third maintenance switch 15 is normally closed switch for when needs overhauld transformer, fairing or the inverter among the transient voltage strutting arrangement of non-energy storage, break off or manual disconnection through the controller first maintenance switch 7 second maintenance switch 14 with third maintenance switch 15 carries out electrical isolation, guarantees maintainer's personal safety.
The rectification inverter device formed by the rectification device and the inverter device 12 can ensure unidirectional power flow.
The inverter 12 is powered by a first power supply I and a second power supply II together, and the output end of the inverter 12 is connected with the first maintenance switch 7. The invention realizes the switching of the non-energy storage transient voltage supporting device between the dual-power supply system and the external sensitive load by controlling the output of the inverter device 12. When the output current of the inverter device 12 is zero (i.e. the inverter device 12 is controlled not to output), the non-energy-storage transient voltage supporting device is disconnected from the external sensitive load; when the inverter 12 outputs a rated ac voltage, the dual power supply system can supply power to an external sensitive load through the transient voltage support device without energy storage. Because the controller 13 can perform transient control on the output of the inverter 12, transient switching of the energy-storage-free transient voltage support device can be realized without delay time, so that seamless switching of a dual-power-supply system is realized.
The controller 13 obtains the voltage information at the first power connection end 1 and the second power connection end 2, and sends on and off signals to the switches after judgment.
Based on the double-power seamless switching device provided by the invention, the invention also provides a double-power seamless switching method.
Example one
In the first embodiment of the present invention, it is assumed that the sensitive load is initially supplied with power from the first power supply i, that is, in fig. 1, the first power connection terminal 1 is connected to the switching control terminal 3, and the second power connection terminal 2 is disconnected from the switching control terminal 3.
Under normal conditions, the sensitive load is supplied with power by the first power supply I through the automatic switching device and the power supply line switch. When the first power supply I is normal, the first thyristor 4 and the second thyristor 5 which are connected in anti-parallel are alternately conducted so as to ensure the normal power supply of the sensitive load. When the quality of the electric energy at the first power supply I does not meet the requirement, the controller 13 detects the voltage at the second power supply II, and if the voltage at the second power supply II meets the requirement, the automatic switching device is switched to supply power to the sensitive load by the second power supply II. There are many switching devices and control methods for this switching process, and the present invention is not limited to automatic switching devices ATSE or SSTS.
When the switching control end 3 of the automatic switching device is connected with the first power connection end 1, the controller 13 collects a first power voltage at the first power connection end 1 and a second power voltage at the second power connection end 2 in real time.
The controller 13 judges whether the first power supply voltage meets the power quality requirement of the external sensitive load, and obtains a first judgment result; if yes, the controller continues to collect a first power supply voltage at the first power supply connecting end 1 and a second power supply voltage at the second power supply connecting end 2 and judges; if not, the controller 13 determines whether the second power supply voltage meets the power quality requirement of the sensitive load, and obtains a second determination result.
If the controller judges that the first power supply voltage does not meet the power quality requirement, but the second power supply voltage meets the power quality requirement of the sensitive load, the controller 13 locks the trigger signals of the first thyristor 4 and the second thyristor 5 to turn off the power supply line switch; meanwhile, the controller 13 controls the inverter 12 to output a rated ac voltage, and switches to a transient voltage support device (including the second transformer 9, the second rectifying device 11, and the inverter 12). The sensitive load is supplied with power by a second power supply II through a second transformer 9, a second rectifying device 11 and an inverter device 12. If the power quality of the second power supply II meets the requirement, the controller 13 controls the automatic switching device to be switched to a state that the switching control end 3 is connected with the second power supply connecting end 2. If the power quality of the second power supply II does not meet the requirement, the rectifying device and the inverting device 12 automatically select one power supply with better power quality from the first power supply I and the second power supply II to supply power to the sensitive load through the corresponding transformer, the rectifying device and the inverting device.
After the controller 13 detects a signal of successful switching, that is, after the automatic switching device is switched to a state where the switching control end 3 is connected with the second power supply connection end 2, the controller 13 sends a trigger signal to the first thyristor 4 and the second thyristor 5 to close the power supply line switch, and simultaneously controls the output current of the inverter 12 to be zero, and the second power supply II supplies power to the sensitive load through the power supply line switch.
Example two
In the second embodiment of the present invention, the second power supply ii supplies power to the sensitive load in the initial condition, that is, the second power connection terminal 2 is connected to the switching control terminal 3 in fig. 1, and the first power connection terminal 1 is disconnected from the switching control terminal 3.
When the switching control terminal 3 of the automatic switching device is connected to the second power connection terminal 2, the controller 13 collects the first power voltage at the first power connection terminal 1 and the second power voltage at the second power connection terminal 2 in real time.
The controller 13 judges whether the second power supply voltage meets the power quality requirement of the external sensitive load, and obtains a third judgment result; if yes, the controller 13 continues to collect and judge the first power supply voltage at the first power supply connection end 1 and the second power supply voltage at the second power supply connection end 2; if not, the controller 13 determines whether the first power voltage meets the power quality requirement of the sensitive load, and obtains a fourth determination result.
If the fourth judgment result is that the first power supply voltage meets the power quality requirement of the sensitive load, the controller 13 controls to turn off the power supply line switch and simultaneously controls the inverter 12 to output rated alternating-current voltage, and the sensitive load is supplied with power by a first power supply I through a first transformer 5, a first rectifying device 10 and the inverter 12; meanwhile, the controller 13 switches the automatic switching device to a state where the switching control terminal 3 is connected to the first power connection terminal 1.
When the automatic switching device is switched to a state that the switching control end 3 is connected with the first power supply connection end 1, the controller 13 closes the power supply line switch, simultaneously controls the output current of the inverter 12 to be zero, and the first power supply I supplies power to the sensitive load through the power supply line switch.
When the power quality of the first power supply I and the second power supply II does not meet the requirement, the controller 13 controls the power supply line switch to be disconnected, controls the inverter 12 to output rated alternating voltage, and automatically selects one power supply with better power quality from the first power supply I and the second power supply II to supply power to the sensitive load through the corresponding transformer, the rectifier and the inverter 12.
In addition, the controller 13 also detects whether the power supply line switch is in a normal working state in real time to obtain a fifth judgment result; if the power supply line switch is in a normal working state, the controller 13 controls the bypass switch 6 to be in a disconnected state; if the power supply line switch is not in a normal working state, the controller 13 controls the bypass switch 6 to be closed, the power supply line switch is short-circuited, and the bypass switch 6 replaces a thyristor and is controlled by a corresponding signal of the controller.
When a transformer, a rectifying device or an inverter device in the transient voltage supporting device without energy storage needs to be overhauled, the first overhauling switch 7, the second overhauling switch 14 and the third overhauling switch 15 can be disconnected through a controller or manually disconnected to electrically isolate each branch, so that the personal safety of an overhauling person is ensured.
In the existing dual-power supply system, an automatic switching device has control delay in the process of switching power supplies, namely, a certain time is needed from the detection of the fact that the quality of electric energy of an original power supply does not meet the requirement to the successful switching to another power supply meeting the requirement. In the action process of the automatic switching device, the normal power supply of the sensitive load can not be ensured, the power quality can not meet the requirement, and even the power failure can occur. When the controller detects that the quality of the electric energy of the power supply does not meet the requirement, the controller ensures the normal power supply of the sensitive load by putting the transient voltage supporting device without energy storage in the process of the action of the automatic switching device, thereby realizing the seamless switching of the double power supplies. The transient voltage supporting device does not need energy storage, and can ensure long-time power supply; in addition, the rectifying device and the inverter device can ensure unidirectional power flow, and can automatically select a reliable power supply from the two power supplies, thereby realizing the automatic control process and simultaneously improving the power supply reliability of sensitive loads.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
The principles and embodiments of the present invention have been described herein using specific examples, which are presented solely to aid in the understanding of the apparatus and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. A dual-power seamless switching device, comprising: the system comprises a double power supply, an automatic switching device, a power supply line switch, a maintenance switch group, a transformer, a rectifying device, an inverter device and a controller; the dual power supply includes a first power supply and a second power supply; the maintenance switch group comprises a first maintenance switch, a second maintenance switch and a third maintenance switch; the transformer comprises a first transformer and a second transformer; the rectifying device comprises a first rectifying device and a second rectifying device;
the automatic switching device comprises a first power supply connecting end, a second power supply connecting end and a switching control end; the first power supply is connected with the first power supply connecting end; the second power supply is connected with the second power supply connecting end; the switching control end is connected with the first power supply connecting end or the second power supply connecting end; one end of the power supply line switch is connected with the switching control end, and the other end of the power supply line switch is connected with an external sensitive load; one end of the first transformer is connected with the first power supply through the second maintenance switch; the other end of the first transformer is connected with one end of the first rectifying device; the other end of the first rectifying device is connected with one end of the inverter; one end of the second transformer is connected with the second power supply through the third maintenance switch; the other end of the second transformer is connected with one end of the second rectifying device; the other end of the second rectifying device is connected with one end of the inverter; the other end of the inverter is connected with one end of the first maintenance switch; the other end of the first maintenance switch is connected with the sensitive load; the controller is respectively connected with the first power supply connecting end, the second power supply connecting end, the switching control end, the power supply line switch and the maintenance switch group.
2. The dual-power seamless switching device of claim 1, wherein the automatic switching device is an Automatic Transfer Switch (ATSE) or a Solid State Transfer Switch (SSTS).
3. The dual-power seamless switching device according to claim 1, wherein the power line switch is composed of two anti-parallel first and second thyristors; the first thyristor and the second thyristor are respectively connected with the controller.
4. The dual-power seamless switching device of claim 1, wherein the first, second, and third service switches in the service switch bank are all normally closed switches.
5. The dual-power seamless switching device of claim 1, further comprising a bypass switch; the bypass switch is connected with the power supply line switch in parallel; the bypass switch is also connected to the controller.
6. A dual power seamless switching method, characterized in that the dual power seamless switching method is based on the dual power seamless switching device of claim 1; the dual-power seamless switching method comprises the following steps:
when the switching control end of the automatic switching device is connected with the first power supply connecting end, the controller collects a first power supply voltage at the first power supply connecting end and a second power supply voltage at the second power supply connecting end;
the controller judges whether the first power supply voltage meets the power quality requirement of an external sensitive load or not to obtain a first judgment result;
if the first judgment result is that the first power supply voltage does not meet the power quality requirement of the sensitive load, the controller judges whether the second power supply voltage meets the power quality requirement of the sensitive load or not to obtain a second judgment result;
if the second judgment result is that the second power supply voltage meets the power quality requirement of the sensitive load, the controller turns off a power supply line switch and controls an inverter to output rated alternating-current voltage, and the sensitive load is supplied with power by a second power supply through a second transformer, a second rectifying device and the inverter; meanwhile, the controller switches the automatic switching device to a state that the switching control end is connected with the second power supply connecting end;
when the automatic switching device is switched to a state that the switching control end is connected with the second power supply connecting end, the controller closes the power supply line switch, controls the output current of the inverter to be zero, and supplies power to the sensitive load through the second power supply via the power supply line switch.
7. The dual-power seamless switching method according to claim 6, further comprising:
when the switching control end of the automatic switching device is connected with the second power supply connecting end, the controller collects a first power supply voltage at the first power supply connecting end and a second power supply voltage at the second power supply connecting end;
the controller judges whether the second power supply voltage meets the power quality requirement of the external sensitive load or not, and obtains a third judgment result;
if the third judgment result is that the second power supply voltage does not meet the power quality requirement of the sensitive load, the controller judges whether the first power supply voltage meets the power quality requirement of the sensitive load or not, and a fourth judgment result is obtained;
if the fourth judgment result shows that the first power supply voltage meets the power quality requirement of the sensitive load, the controller turns off a power supply line switch and controls an inverter to output rated alternating-current voltage, and the sensitive load is supplied with power by a first power supply through a first transformer, a first rectifying device and the inverter; meanwhile, the controller switches the automatic switching device to a state that the switching control end is connected with the first power supply connecting end;
when the automatic switching device is switched to a state that the switching control end is connected with the first power supply connecting end, the controller closes the power supply line switch, controls the output current of the inverter to be zero, and supplies power to the sensitive load through the power supply line switch by the first power supply.
8. The dual-power seamless switching method according to claim 7, further comprising:
the controller detects whether the power supply circuit switch is in a normal working state or not, and a fifth judgment result is obtained;
if the fifth judgment result is that the power supply line switch is in a normal working state, the controller controls the bypass switch to be in a disconnected state;
and if the fifth judgment result shows that the power supply line switch is not in a normal working state, the controller controls the bypass switch to be closed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181157A (en) * | 2020-01-19 | 2020-05-19 | 国网河北省电力有限公司衡水供电分公司 | Load switching system |
| CN113852086A (en) * | 2021-09-28 | 2021-12-28 | 广东电网有限责任公司 | Voltage sag monitoring control system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769217A (en) * | 2016-08-23 | 2018-03-06 | 江苏华峰电器控制设备有限公司 | A kind of dynamic electric voltage recovery device |
| CN109687570A (en) * | 2018-12-17 | 2019-04-26 | 国网北京市电力公司 | One kind zero flashes low-voltage distribution system and operating method |
-
2019
- 2019-09-25 CN CN201910909830.9A patent/CN110601351A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769217A (en) * | 2016-08-23 | 2018-03-06 | 江苏华峰电器控制设备有限公司 | A kind of dynamic electric voltage recovery device |
| CN109687570A (en) * | 2018-12-17 | 2019-04-26 | 国网北京市电力公司 | One kind zero flashes low-voltage distribution system and operating method |
Non-Patent Citations (1)
| Title |
|---|
| 任宗基: "《重要负荷电源无缝切换供电方法的研究》", 《CNKI优秀硕士论文全文集》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181157A (en) * | 2020-01-19 | 2020-05-19 | 国网河北省电力有限公司衡水供电分公司 | Load switching system |
| CN113852086A (en) * | 2021-09-28 | 2021-12-28 | 广东电网有限责任公司 | Voltage sag monitoring control system |
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Application publication date: 20191220 |