CN112583031B - Phase switching device and method - Google Patents
Phase switching device and method Download PDFInfo
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- CN112583031B CN112583031B CN202011165188.7A CN202011165188A CN112583031B CN 112583031 B CN112583031 B CN 112583031B CN 202011165188 A CN202011165188 A CN 202011165188A CN 112583031 B CN112583031 B CN 112583031B
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- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000004146 energy storage Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 11
- 239000003381 stabilizer Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
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- 239000004020 conductor Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The application relates to a phase switching device and a phase switching method. The current detection module is arranged at the output end of the three-phase power supply and is used for detecting the current of the three phase lines connected with the three-line power supply; the switching module is connected with a three-phase power supply; the control module is connected with the current detection module and the switching module and is used for judging whether the three phases of the three-phase power supply are balanced according to the current of the three phases, and controlling the switching module to switch the output phases of the three-phase power supply to the single-phase user equipment according to the judging result. The phase switching device provided by the application does not need manual operation, can reduce the waste of manpower, and has higher timeliness of controlling the switching of the switching module according to the judgment result.
Description
Technical Field
The application relates to the technical field of power supply and distribution, in particular to a phase switching device and a phase switching method.
Background
In urban civil power grid and agricultural power grid, the phenomenon of unbalanced current among three phases of three-phase power supply is particularly serious due to the existence of a large number of single-phase loads. Unbalanced currents in the distribution network can increase losses of the lines and the transformers, reduce output power of the transformers, and even affect safe operation of the transformers. For users, unbalanced voltages among three phases of the three-phase power supply can cause excessive high or low phase voltages, and the electric equipment can be burnt out due to the excessive high voltages, so that the electric equipment cannot work normally. Therefore, in a three-phase four-wire distribution network system, three-phase unbalance of a single-phase user can influence power supply safety and economic benefit.
In the conventional technology, a plurality of phase change switches are generally arranged in a proper line topology structure in a line of a power distribution network, so that the purpose of adjusting three-phase unbalance is realized. However, the phase change switch used in the method needs manual operation, which wastes manpower and has unsatisfactory control timeliness.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a phase switching device and method
In one aspect, an embodiment of the present application provides a phase switching apparatus, including:
the current detection module is arranged at the output end of the three-phase power supply and used for detecting the current of three phase lines connected with the three-phase power supply;
the switching module is connected with the three-phase power supply;
and the control module is connected with the current detection module and the switching module and is used for judging whether the three phases of the three-phase power supply are balanced according to the current of the three phase lines and controlling the switching module to switch the output phases of the three-phase power supply to the single-phase user equipment according to the judging result.
In one embodiment, the switching module includes:
the three contact pieces are respectively connected with three phase lines of a three-phase power supply;
the three contact pieces are arranged on the binding post;
the control end of swinging boom is connected with control module, and the first end and the contact piece of swinging boom are connected, and the second end of swinging boom sets up in the centre of a circle of terminal for be connected with single-phase user equipment, control module is used for controlling the swinging boom rotation for the first end of swinging boom switches between each contact piece and connects.
In one embodiment, the three contact pads are disposed at equal angles along the center of the post.
In one embodiment, the method further comprises:
and the energy storage module is connected with the control module and used for supplying power to the single-phase user equipment in the process of switching the output phases of the three-phase power supply by the switching module according to the judging result.
In one embodiment, the energy storage module includes:
a battery;
the detection circuit is connected with the battery and used for detecting the electric quantity of the battery;
the charging circuit is connected with the battery and used for charging the battery;
the inverter circuit is connected with the battery and used for converting direct current of the battery into alternating current;
and the controller is connected with the detection circuit, the charging circuit, the inverter circuit and the control module and is used for controlling the charging circuit to charge the battery according to the electric quantity of the battery and controlling the battery to supply power to the single-phase user equipment in the process of switching the output phase of the three-phase power supply by the switching module through the inverter circuit according to the judgment result output by the control module.
In one embodiment, the energy storage device further comprises:
the feedback circuit is connected with the inverter circuit and the controller and is used for acquiring alternating current and transmitting the alternating current to the controller;
the controller is also used for controlling the battery to supply power to the single-phase user equipment through the inverter circuit in the process of switching the output phases of the three-phase power supply by the switching module according to the alternating current.
In one embodiment, the method further comprises:
the voltage detection module is arranged at the output end of the three-phase power supply and connected with the control module, and the voltage detection module is used for detecting the voltage of three phase lines of the three-phase power supply;
the control module is also used for judging whether the three-phase power supply is balanced or not according to the current of the three-phase lines and the voltage of the three-phase lines.
In one embodiment, the method further comprises:
the zero-crossing detection module is connected with the three-phase power supply and the control module and is used for detecting the instantaneous voltage of three phase lines of the three-phase power supply;
and the control module is used for controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment when the instantaneous voltage of the three-phase power supply is zero according to the judgment result.
On the other hand, an embodiment of the present application further provides a method for performing phase switching by using the phase switching device provided in the foregoing embodiment, including:
acquiring the current of the output end of the three phase line of the three-phase power supply;
judging whether the three-phase power supply is balanced or not according to the current of the three phase lines;
if the three-phase power supply is unbalanced, the switching module is controlled to switch to the phase with the smallest current in the three-phase power supply, so that the phase with the smallest current in the three-phase power supply is used for supplying power to the single-phase user equipment.
In one embodiment, the method further comprises:
acquiring current data of three phase lines in a preset period;
analyzing the time point of three-phase unbalance of the three-phase power supply according to the current data;
and controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment before the time point of three-phase unbalance.
The embodiment of the application provides a phase switching device and a phase switching method. The current detection module is arranged at the output end of the three-phase power supply and used for detecting the current of three phase lines connected with the three-phase power supply; the switching module is connected with a three-phase power supply; the control module is connected with the current detection module and the switching module and is used for judging whether the three phases of the three-phase power supply are balanced according to the current of the three phases, and controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment according to the judging result. The control module in the phase switching device provided by the embodiment can judge whether the current of the three-phase power supply is balanced according to the current detected by the current detection module, and control the switching module to switch the output phase of the three-phase power supply according to the judgment result, so that the operation of a worker is not needed, and the labor can be saved. And moreover, the control module is used for controlling the switching module to switch the output phase of the three-phase power supply, so that the timeliness is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present application, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for different persons skilled in the art.
Fig. 1 is a schematic structural diagram of a phase switching device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a switching module according to an embodiment of the application;
fig. 3 is a schematic structural diagram of a phase switching device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an energy storage module according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a phase switching device according to an embodiment of the present application;
fig. 6 is a flowchart illustrating a phase switching method according to an embodiment of the present application;
fig. 7 is a flowchart illustrating a phase switching method according to an embodiment of the present application.
Reference numerals illustrate:
10. a phase switching device; 100. a current detection module; 200. a switching module; 210. a contact piece; 220. binding posts; 230. a rotating arm; 300. a control module; 400. an energy storage module; 410. a battery; 420. a detection circuit; 430. a charging circuit; 440. an inverter circuit; 450. a controller; 460. a feedback circuit; 500. a voltage detection module; 600. zero crossing detection module.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The phase switching device provided by the application can be arranged on the single-phase user equipment branch line in the same transformer area, so that the three phases on the single-phase user equipment branch line are in a balanced state. In other words, the phase switching device is arranged on a three-phase line of the three-phase power supply, which is directly connected with the single-phase user equipment, and the three phases on the branch line of the single-phase user equipment are in a balanced state by switching the three-phase line.
Referring to fig. 1, a phase switching device 10 according to an embodiment of the application includes a current detection module 100, a switching module 200, and a control module 300.
The current detection module 100 is disposed at an output end of the three-phase power supply, and is configured to detect a current of three phase lines connected to the three-phase power supply. The output end of the three-phase power supply is the end of the three-phase power supply for supplying power to the user equipment, and the three phase lines connected with the three-phase power supply are an A phase line, a B phase line and a C phase line. The current detection module 100 may include three current transformers respectively disposed on the a-phase line, the B-phase line, and the C-phase line, and the three current transformers may detect currents on the respective phase lines. The specific kind and arrangement of the current detection module 100 are not limited in this embodiment, as long as the functions thereof can be realized.
The switching module 200 is connected with a three-phase power supply, and the switching module 200 may be connected with an a-phase line, a B-phase line, and a C-phase line of the three-phase power supply. The switching module 200 may be a selector switch, or may be any other device capable of implementing a switching function, and the type and structure of the switching module 200 in this embodiment are not limited at all, as long as the function thereof can be implemented.
The control module 300 is connected to the current detection module 100 and the switching module 200, and is configured to determine whether the three-phase power is balanced according to the current of the three-phase line, and control the switching module 200 to switch the output phase of the three-phase power to the single-phase user equipment according to the determination result. The control module 300 compares the current on the three phases when receiving the current passing on the a phase, the C phase and the D phase detected by the current detecting module 100. The control module 300 controls the switching module 200 to switch the output phase of the three power supplies to the single-phase device according to the comparison result. In a specific embodiment, by comparing the control modules 300, if the currents on the three phases are equal, it is indicated that the three phases of the three-phase power supply are in a balanced state, and at this time, the switching module 200 is not required to be controlled to switch the output phases of the three-phase power supply to the single-phase user equipment; if the currents on the three phases are not equal, the control module 300 controls the switching module 200 to switch the output phase with the smallest current in the three phases as the phase of the three phases to supply power to the single-phase user equipment. The control module 300 may be a computer device, which may be, but is not limited to, various industrial computers, notebook computers, smart phones, tablet computers, portable wearable devices, etc.
The working principle of the phase switching device 10 provided in this embodiment is as follows:
the current detection module 100 is used to detect the currents on the a phase line, the B phase line and the C phase line in the three phase lines of the output end of the three-phase power supply, and send the currents on the three phase lines to the control module 300. The control module 300 determines whether the three phases of the three-phase power supply are in a balanced state by comparing the received currents on the three-phase lines, and the control module 300 controls the switching module 200 to switch the output phase of the three-phase power supply to the single-phase user equipment according to the determined result, so as to achieve the purpose that the three phases of the three-phase power supply are in a balanced state.
The phase switching device 10 provided in this embodiment includes a current detection module 100, a switching module 200, and a control module 300. The current detection module 100 is disposed at an output end of the three-phase power supply, and is configured to detect a current of three phase lines connected to the three-phase power supply; the switching module 200 is connected with a three-phase power supply; the control module 300 is connected to the current detection module 100 and the switching module 200, and is configured to determine whether the three phases of the three-phase power supply are balanced according to the current of the three phases, and control the switching module 200 to switch the output phase of the three-phase power supply to the single-phase user equipment according to the determination result. In the phase switching device 10 provided in this embodiment, the control module 300 can determine whether the current of the three-phase power supply is balanced according to the current detected by the current detection module 100, and control the switching module 200 to switch the output phase of the three-phase power supply according to the determination result, so that the operation of a worker is not required, and the labor can be saved. And, the control module 300 is used for controlling the switching module 200 to switch the output phase of the three-phase power supply, so that the timeliness is high. Moreover, the phase switching device 10 provided in this embodiment ensures that the three phases on each branch line in the distribution network station are in a balanced state, so that the three phases on the trunk line of the distribution network station can also reach a balanced state.
Referring to fig. 2, in one embodiment, the switching module 200 includes three contact pads 210, a post 220, and a rotating arm 230.
The three contact pieces 210 are respectively connected to three phase lines of a three-phase power supply. The shape of each contact 210 may be rectangular, circular, or any other irregular shape. The size of each contact 210 may be selected according to the sizes of the three-phase line, the post 220, and the rotating arm 230. The material of each contact 210 may be copper or another conductor such as silver. The shape, size, and material of the three contact pieces 210 may be the same or different, and the present embodiment does not limit the shape, size, material, etc. of the three contact pieces 210 at all as long as the functions thereof can be achieved.
Three contact pieces 210 are provided on the post 220, in other words, the post 220 serves to support the three contact pieces 210. Post 220 may be solid or hollow. The material of the post 220 may be hard plastic, or may be stainless steel or other materials. The size, structure, material, and the like of the terminal 220 are not limited in this embodiment as long as the functions thereof can be achieved.
The rotating arm 230 includes a first end, a second end, and a control end. The control end of the rotating arm 230 is connected with the control module 300, the first end of the rotating arm 230 is connected with the contact piece 210, and the second end of the rotating arm 230 is arranged at the center of the binding post 220 and is connected with single-phase user equipment in use. The control module 300 is used for controlling the rotation of the rotation arm 230, so that the first end of the rotation arm 230 switches the connection between the contact pads 210. The second end of the rotating arm 230 is disposed at the center of the post 220, so that the rotating arm 230 can be better connected with each contact piece 230 during the rotation process. The material of the rotating arm 230 may be copper or a conductor such as silver, and the material of the rotating arm 230 may be the same as or different from the material of the contact piece 210. The shape of the rotating arm 230 may be a cuboid, a cylinder or other irregular solid shapes, and the shape and material of the rotating arm 230 in this embodiment are not limited, so long as it can be ensured that the rotating arm 230 can be conducted when being connected to the contact piece 210. In a particular embodiment, three contact pads 210 are connected to the A, B and C phases, respectively. Currently, the first end of the rotating arm 230 is connected to the a contact, i.e. the a phase of the three-phase power supply supplies power to the single-phase user equipment. If the three phases of the three-phase power supply are in an unbalanced state and the C phase is needed to supply power to the single-phase user equipment, the control module 300 controls the rotation of the rotation arm 230, so that the first end of the rotation arm 230 is connected to the C contact.
In a specific embodiment, the switching module 200 further includes a motor connected between the control end of the rotating arm 230 and the control module 300, and the control module 300 controls the driving motor to drive the rotating arm 230 to rotate according to the determination result, so that the first end of the rotating arm 230 is connected to the contact piece 210.
In one embodiment, three contact blades 210 are disposed at equal angles along the center of post 220, which is 120 degrees. In other words, the included angle between the line connecting the first contact piece and the center of the post 220 and the line connecting the second contact piece and the center of the post 220, and the line connecting the third contact piece and the center of the post 220 is 120 degrees. Thus, the distance from one contact piece to the other two contact pieces of the rotating arm 230 is controlled by the control module 300 to be the same, which is very convenient for controlling the rotating arm 230 by the control module 300.
Referring to fig. 3, in one embodiment, the phase switching device 10 further includes an energy storage module 400. The energy storage module 400 is connected with the control module 300, and is used for supplying power to the single-phase user equipment in the process of switching the output phase of the three-phase power supply by the switching module 200 according to the judgment result output by the control module 300. The energy storage module 400 may be a device that stores power, such as a battery, that is used to power single-phase consumer devices when the three-phase power supply is not available. The kind and structure of the energy storage module 400 are not limited in this embodiment, as long as the functions thereof can be realized. In the process that the control module 300 controls the switching module 200 to switch from one phase to the other phase of the three-phase power supply, the energy storage module 400 supplies power to the single-phase user equipment, so that a transient power failure phenomenon of the single-phase user equipment can be avoided, the work or the life of a user is influenced, and the reliability and the practicability of the phase switching device 10 are improved.
Referring to fig. 4, in one embodiment, the energy storage module 400 includes a battery 410, a detection circuit 420, a charging circuit 430, an inverter circuit 440, and a controller 450. The battery 410 may be a dry cell battery, a lead storage battery, a lithium battery, or the like. The type of the battery 410 is not limited in this embodiment, and the user can select according to the actual requirement.
The detection circuit 420 is connected to the battery 410 and is configured to detect an amount of power of the battery 410. The detection circuit 420 may be a voltage detection circuit that characterizes the charge of the battery 410 by detecting the voltage of the battery 410. The charging circuit 430 is connected to the battery 410 for charging the battery 410. An input terminal of the charging circuit 430 may be connected to a three-phase power supply, and an output terminal of the charging circuit 430 is connected to the battery 410. The charging circuit 430 may include a transformer, a rectifier, and a voltage regulator. The transformer can step down the commercial power and then input the commercial power into the rectifier; the rectifier converts the reduced alternating current into direct current and inputs the direct current into the voltage stabilizer; the voltage stabilizer stabilizes the voltage of the direct current and inputs the stabilized voltage to the battery 410, thereby achieving the purpose of charging the battery 410. The present embodiment does not impose any limitation on the kind and structure of the detection circuit 420 and the charging circuit 430, etc., as long as the functions thereof can be realized.
The inverter circuit 440 is connected to the battery 410 for converting the dc power of the battery 410 into ac power to power the single-phase user equipment. The output of the inverter circuit 440 is directly connected to a load and is a passive inverter circuit. The inverter circuit 440 may include a switching transistor therein, and the frequency, voltage, etc. of the converted ac power may be adjusted by controlling the duty ratio of the switching transistor. The present embodiment does not limit the kind and structure of the inverter circuit 440, etc., as long as the functions thereof can be realized.
The controller 450 is connected to the detection circuit 420, the charging circuit 430, the inverter circuit 440, and the control module 300. The controller 450 is configured to control the charging circuit 430 to charge the battery 410 according to the electric quantity of the battery 410, and control the battery 410 to supply power to the single-phase user equipment through the inverter circuit 440 during the process of switching the output phase of the three-phase power supply by the switching module 200 according to the determination result output by the control module 300. After acquiring the charge of the battery 410 detected by the detection circuit 420, the controller 450 determines whether the charge of the battery 410 is full. In a specific embodiment, the detection circuit 420 may be a voltage detection circuit, and the controller 450, after acquiring the voltage of the battery 410 detected by the voltage detection circuit, indicates that the battery 410 is in a full state if the voltage is equal to a preset threshold; if the voltage is less than the preset threshold, indicating that the battery 410 is in an unfilled state, the controller 450 controls the charging circuit 430 to charge the battery 410 until the charging circuit 430 is controlled to stop charging after the battery 410 is full. When the control module 300 determines that the three-phase power is in an unbalanced state according to the determination result, the switching module 200 needs to be controlled to switch the output phase of the three-phase power to the single-phase user equipment. During the phase switching of the switching module 200, the controller 450 controls the battery 410 to supply power to the single-phase user equipment through the inverter circuit 440. In this embodiment, the energy storage module 400 has a simple structure, is convenient to operate, and has high reliability and practicability.
With continued reference to fig. 4, in one embodiment, the energy storage device 400 further includes a feedback circuit 460. The feedback circuit 460 is connected to the inverter circuit 440 and the controller 450 for acquiring the alternating current and transmitting the alternating current to the controller 450. The controller 450 is further configured to control the battery 410 to supply power to the single-phase user equipment through the inverter circuit 440 during the switching of the output phases of the three-phase power source by the switching module 200 according to the ac power. The controller 450 may obtain the ac power converted by the inverter circuit 440 through the feedback circuit 460, and determine whether the voltage, frequency, etc. of the ac power meet the requirements of the single-phase user equipment. Specifically, the ac voltage was 220V and the frequency was 50HZ. If not, the controller 450 may adjust the duty cycle of the switching tube in the inverter circuit 440, and the like, and change the voltage and frequency of the ac power, so that the ac power can meet the requirements of the single-phase user equipment. In this embodiment, the controller 450 can timely obtain the voltage and frequency of the ac power through the feedback circuit 460, and regulate the ac power input to the single-phase user equipment through controlling the inverter circuit 440, so that the energy storage device 400 supplies power to the single-phase user equipment with reliability, thereby improving the reliability of the energy storage device 400.
Referring to fig. 5, in one embodiment, the phase switching device 10 further includes a voltage detection module 500. The voltage detection module 500 is disposed at an output end of the three-phase power supply and connected to the control module 300. The voltage detection module 500 is used for detecting voltages of three phase lines of a three-phase power supply. The control module 300 is further configured to determine whether the three-phase power supply is balanced according to the current of the three-phase line and the voltage of the three-phase line. The voltage detection module 500 may include three voltage transformers respectively disposed on an a phase line, a B phase line, and a C phase line of the three-phase power supply, and the three voltage transformers may detect voltages on the respective groups of phase lines. The specific kind and arrangement of the voltage detection module 500 are not limited in this embodiment, as long as the functions thereof can be realized. The control module 300 compares the acquired voltages on the three-phase lines, and if the voltages on the three-phase lines are equal, the three phases of the three-phase power supply are in a balanced state; if the voltages on the three phase lines are not equal, it is indicated that the three phases of the three phase power supply are in an unbalanced state. The control module 300 determines whether the three-phase power is balanced according to the voltages of the three-phase lines, and can detect whether the result of the power determination through the three-phase lines is accurate, so that the control module 300 can accurately control the switching module 200 to switch the output phase of the three-phase power to the single-phase user equipment, and further can improve the reliability and practicality of the phase switching device 10.
With continued reference to fig. 5, in one embodiment, the phase switching apparatus 10 further includes a zero crossing detection module 600. The zero-crossing detection module 600 is connected to the three-phase power supply and control module 300 for detecting the instantaneous voltage of the three phase lines of the three-phase power supply. The control module 300 is configured to control the switching module 200 to switch the output phase of the three-phase power supply to the single-phase user equipment when the instantaneous voltage of the three-phase power supply is zero according to the determination result. The zero-crossing detection module 600 may include three zero-crossing detection units, which are respectively disposed on three phase lines of a three-phase power supply, and may respectively detect instantaneous voltages on the respective phase lines. In a specific embodiment, when the three phases of the three-phase power supply are in an unbalanced state and the output phase of the three-phase power supply needs to be switched from the a phase to the B phase, the control module 300 controls the switching module 200 to switch from the a phase to the B phase when the instantaneous voltage on the a phase is zero. In this way, arc damage to the switching module 200 during switching can be avoided, and reliability of the phase switching device 10 can be ensured.
Referring to fig. 6, an embodiment of the present application provides a method for performing phase switching by using the phase switching device provided in the above embodiment, where the method includes the steps of:
and S100, acquiring the current of the output end of the three phase line of the three-phase power supply.
The output end of the three phase line of the three phase power supply is the end of the A phase line, the B phase line and the C phase line of the three phase power supply, which are connected with the single phase user equipment. The current of the output end of the three phase line of the three-phase power supply can be obtained through the current detection module. For the specific description of the current detection module, reference may be made to the description in the phase switching device, which is not repeated herein.
And S200, judging whether the three-phase power supply is balanced or not according to the current of the three phase lines.
The control module compares the acquired currents on the three-phase lines, and if the currents on the A-phase line, the B-phase line and the C-phase line are equal, the three phases of the three-phase power supply are in a balanced state; if the current of one phase line is not equal to the current of the other phase line in the phase line A, the phase line B and the phase line C, the three phases of the three-phase power supply are in an unbalanced state.
And S300, if the three-phase power supply is unbalanced, controlling the switching module to switch to a phase with the minimum current in the three-phase power supply so as to enable the phase with the minimum current in the three-phase power supply to supply power for the single-phase user equipment.
The control module compares the current on the three-phase line, if the three phases of the three-phase power supply are in an unbalanced state, the control module controls the switching module to switch the phase with the smallest current in the three-phase power supply, the phase with the smallest current represents that the load on the phase is smaller, the phase is used for supplying power to the single-phase user equipment, the single-phase user equipment can be ensured to work normally, and the single-phase user equipment cannot be damaged. If the three phases of the three-phase power supply are in the balanced state, the phases of the three-phase power supply, which are used for supplying power to the single-phase user equipment, do not need to be switched.
The phase switching method provided in this embodiment should be switched by the phase switching device provided in the above embodiment, so that the phase switching method has all the advantages of the phase switching device, which is not described herein.
Referring to fig. 7, in one embodiment, the method further comprises:
s400, acquiring current data of three phase lines in a preset period.
S500, analyzing the time point of three-phase unbalance of the three-phase power supply according to the current data.
S600, the control switching module switches the output phase of the three-phase power supply to the single-phase user equipment before the time point of three-phase unbalance.
The preset period may be a preset time period or a preset power supply period of the three-phase power supply. The control module can store all the currents in the preset period acquired by the current detection module to form current data, and the control module analyzes the current data to judge the unbalanced three-phase time point of the three-phase power supply. The control module controls the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment before the three-phase unbalanced time point, and the three-phase unbalanced time point can be within one hour or two hours before the three-phase unbalanced time point. In a specific embodiment, assuming that the preset period is one week, the control module can determine that the current on the three-phase line at 8 pm is in an unbalanced state every day according to the acquired current data in one week, and the current of the a phase line in the three phase lines is larger and the current of the C phase line is smaller. The control module may control the switching module to switch the output phase of the three-phase power to the single-phase user equipment from the a-phase to the C-phase at about 7 pm for 30 minutes. Therefore, the switching module is controlled to switch phases in advance, the phases can be switched on a low-current state line, and current surge can be reduced, so that the switching phases are more stably transited.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (7)
1. A phase switching apparatus, comprising:
the current detection module is arranged at the output end of the three-phase power supply and is used for detecting the current of three phase lines connected with the three-phase power supply in a preset period;
the switching module is connected with the three-phase power supply;
the control module is connected with the current detection module and the switching module and is used for judging whether the three phases of the three-phase power supply are balanced according to whether the currents of the three phases are equal or not, obtaining a judging result of the three-phase unbalance under the condition that the currents of the three phases are not equal, and controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment before the time point of the three-phase unbalance of the three-phase power supply according to the judging result;
the energy storage module is connected with the control module and is used for supplying power to the single-phase user equipment in the process of switching the output phase of the three-phase power supply according to the judging result, and the energy storage module comprises:
a battery;
the charging circuit is connected with the battery and used for charging the battery; the charging circuit comprises a voltage stabilizer, wherein the voltage stabilizer is used for stabilizing the voltage of direct current and inputting the voltage to the battery;
the inverter circuit is connected with the battery and used for converting direct current of the battery into alternating current; the inverter circuit comprises a switching tube and is used for adjusting the frequency and the voltage of the converted alternating current according to the duty ratio of the switching tube;
the detection circuit is connected with the battery and used for detecting the electric quantity of the battery;
the controller is connected with the detection circuit, the charging circuit, the inverter circuit and the control module and is used for controlling the charging circuit to charge the battery according to the electric quantity of the battery and controlling the battery to supply power to the single-phase user equipment through the inverter circuit in the process of switching the output phase of the three-phase power supply by the switching module according to the judgment result output by the control module;
the feedback circuit is connected with the inverter circuit and the controller and is used for acquiring the alternating current and transmitting the alternating current to the controller;
the controller is also used for controlling the battery to supply power to the single-phase user equipment through the inverter circuit in the process that the switching module switches the output phase of the three-phase power supply according to the alternating current.
2. The phase switching device according to claim 1, wherein the switching module comprises:
the three contact pieces are respectively connected with three phase lines of the three-phase power supply;
the three contact pieces are arranged on the binding post;
the control module is used for controlling the rotation of the rotating arm, so that the first end of the rotating arm is switched and connected between the contact pieces.
3. The phase switching device according to claim 2, wherein the three contact pieces are disposed at equal angles along a center of the post.
4. The phase switching device according to claim 1, further comprising:
the voltage detection module is arranged at the output end of the three-phase power supply and connected with the control module, and is used for detecting the voltage of the three phase lines of the three-phase power supply;
the control module is also used for judging whether the three-phase power supply is balanced or not according to the current of the three-phase lines and the voltage of the three-phase lines.
5. The phase switching device according to claim 1, further comprising:
the zero-crossing detection module is connected with the three-phase power supply and the control module and is used for detecting the instantaneous voltage of the three phase lines of the three-phase power supply;
and the control module is used for controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment when the instantaneous voltage of the three-phase power supply is zero according to the judging result.
6. A method of phase switching using a phase switching device according to any one of claims 1 to 5, comprising:
acquiring the current of the output end of the three phase line of the three-phase power supply;
judging whether the three-phase power supply is balanced or not according to whether the currents of the three phase lines are equal or not;
and if the three-phase power supply is unbalanced, controlling the switching module to switch to a phase with the minimum current in the three-phase power supply so that the phase with the minimum current in the three-phase power supply supplies power to the single-phase user equipment.
7. The method as recited in claim 6, further comprising:
acquiring current data of the three phase lines in a preset period;
analyzing a time point of three-phase imbalance of the three-phase power supply according to the current data;
and controlling the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment before the time point of the three-phase imbalance.
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