CN112583031A - Phase switching device and method - Google Patents
Phase switching device and method Download PDFInfo
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- CN112583031A CN112583031A CN202011165188.7A CN202011165188A CN112583031A CN 112583031 A CN112583031 A CN 112583031A CN 202011165188 A CN202011165188 A CN 202011165188A CN 112583031 A CN112583031 A CN 112583031A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application relates to a phase switching device and a 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 line 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 used for judging whether three phases of the three-phase power supply are balanced or not according to currents of the three-phase lines and controlling the switching module to switch output phases of the three-phase power supply to the single-phase user equipment according to a judgment result. The application provides a phase place auto-change over device need not manual operation, can reduce the waste of manpower to control module group switches the higher promptness that has that the module switches according to judged result control.
Description
Technical Field
The present application relates to the field of power supply and distribution technologies, and in particular, to a phase switching apparatus and method.
Background
In urban civil power grids and agricultural power grids, the current imbalance phenomenon among three phases of a three-phase power supply is particularly serious due to the existence of a large number of single-phase loads. Unbalanced current in the distribution network can increase the loss of lines and transformers, reduce the output power of the transformers, and even influence the safe operation of the transformers. For a user, the voltage unbalance among three phases of the three-phase power supply can cause that phase voltage is too high or too low, the too high voltage can burn out electric equipment, and the too low voltage can cause that the electric equipment cannot work normally. Therefore, the three-phase imbalance of the single-phase user in the three-phase four-wire distribution network system can affect the power supply safety and the economic benefit.
In the conventional technology, a plurality of phase change switches are usually arranged in a line of a power distribution network by finding a proper line topology structure, so that the purpose of adjusting three-phase unbalance is achieved. However, the phase change switch used in the method needs manual operation, manpower is wasted, and the timeliness of regulation is not ideal.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a phase switching apparatus and method for solving the above-mentioned problems
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 the three-phase line 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 used for judging whether the three phases of the three-phase power supply are balanced or not according to the currents 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 judgment result.
In one embodiment, the switching module comprises:
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 swinging boom, the control end and the control module group of swinging boom are connected, 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, the control module group is used for controlling the swinging boom rotatory, makes the first end of swinging boom switch between each contact piece and connects.
In one embodiment, the three contact pieces are arranged at equal angles along the center of the circle of the terminal post.
In one embodiment, the method further comprises the following steps:
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 phase of the three-phase power supply by the switching module according to the judgment result.
In one embodiment, the energy storage module comprises:
a battery;
the detection circuit is connected with the battery and is used for detecting the electric quantity of the battery;
the charging circuit is connected with the battery and is used for charging the battery;
the inverter circuit is connected with the battery and is used for converting the direct current of the battery into alternating current;
the controller is connected with the detection circuit, the charging circuit, the inverter circuit and the control module and 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.
In one embodiment, the energy storage device further comprises:
the feedback circuit is connected with the inverter circuit and the controller and 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 phase of the three-phase power supply by the switching module according to the alternating current.
In one embodiment, the method further comprises the following steps:
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 line 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 line and the voltage of the three-phase line.
In one embodiment, the method further comprises the following steps:
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 line 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 apparatus provided in the foregoing embodiment, including:
acquiring current of an output end of a three-phase line of a three-phase power supply;
judging whether the three-phase power supply is balanced or not according to the current of the three-phase line;
and if the three-phase power supply is unbalanced, controlling the switching module to switch to the phase with the minimum current in the three-phase power supply so as to supply power to the single-phase user equipment by the phase with the minimum current in the three-phase power supply.
In one embodiment, the method further comprises the following steps:
acquiring current data of a three-phase line in a preset period;
analyzing the time point of three-phase unbalance of the three-phase power supply according to the current data;
the control switching module switches the output phases 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 is used for detecting the current of the three-phase line 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 used for judging whether three phases of the three-phase power supply are balanced or not according to currents of the three-phase lines and controlling the switching module to switch output phases of the three-phase power supply to the single-phase user equipment according to a judgment result. The control module can judge whether the current of three-phase power supply is balanced according to the current that the current detection module detected among the phase place auto-change over device that this embodiment provided to control according to the judged result and switch the output phase that the module switched three-phase power supply, need not staff's operation like this, can use manpower sparingly. And 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 strong.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
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 present 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 steps of a phase switching method according to an embodiment of the present application;
fig. 7 is a flowchart illustrating steps of a phase switching method according to an embodiment of the present application.
Description of reference numerals:
10. a phase switching device; 100. a current detection module; 200. a switching module; 210. a contact piece; 220. a binding post; 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 cross detection module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
The following describes the technical solutions of the present application and how to solve the technical problems with the technical solutions of the present application in detail with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation 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 three phases on the single-phase user equipment branch line are in a balanced state. In other words, the phase switching device is disposed on a three-phase line where the three-phase power supply is directly connected to the single-phase user equipment, and the three phases on the branch lines of the single-phase user equipment are in a balanced state by switching the three-phase line.
Referring to fig. 1, an embodiment of a phase switching device 10 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 a three-phase line connected to the three-phase power supply. The output end of the three-phase power supply refers to one end of the three-phase power supply supplying power to the user equipment, and the three phase lines connected with the three-phase power supply comprise 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 present embodiment does not limit the specific type, arrangement and the like of the current detection module 100, as long as the function thereof can be realized.
The switching module 200 is connected to a three-phase power supply, and the switching module 200 may be connected to phase a, phase B, and phase C of the three-phase power supply. The switching module 200 may be a selection switch, or may be other devices capable of realizing the switching function, and the present embodiment does not limit the kind, structure, and the like of the switching module 200 at all as long as the function thereof can be realized.
The control module 300 is connected to both 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 currents on the three phase lines when receiving the currents passing through the phase lines a, C and D detected by the current detection module 100. The control module 300 controls the switching module 200 to switch the output phases of the three power supplies to the single phase for the equipment according to the comparison result. In a specific embodiment, through comparison of the control module 300, if the currents on the three phase lines are equal, it indicates that the three phases of the three-phase power supply are in a balanced state, and at this time, the switching module 200 does not need 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 phase lines are not equal, it indicates that the three phases of the three-phase power supply are in an unbalanced state, and the control module 300 controls the switching module 200 to switch the output phase with the minimum current in the three-phase power supply as the phase of the three-phase power supply supplying 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, and the like.
The operating principle of the phase switching device 10 provided in the present embodiment is as follows:
the current detection module 100 is used for detecting the currents on the a-phase line, the B-phase line and the C-phase line of the three-phase lines at the output end of the three-phase power supply, and sending the currents on the three-phase lines to the control module 300. The control module 300 judges 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 phases of the three-phase power supply to the single-phase user equipment according to the judgment result so as to achieve the purpose that the three phases of the three-phase power supply are in the balanced state.
The phase switching device 10 of the present 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 a three-phase line 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 both the current detection module 100 and the switching module 200, and is configured to determine whether three phases of the three-phase power supply are balanced according to the current of the three-phase lines, 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 may determine whether the current of the three-phase power is balanced according to the current detected by the current detecting module 100, and control the switching module 200 to switch the output phase of the three-phase power according to the determination result, so that the operation of the worker is not required, and the labor is saved. In addition, the control module 300 is used to control the switching module 200 to switch the output phases of the three-phase power, so that the timeliness is strong. Furthermore, 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 main line of the distribution network station can also reach a balanced state.
Referring to fig. 2, in one embodiment, the switch module 200 includes three contact pads 210, a contact post 220 and a rotation arm 230.
The three contact pieces 210 are connected to three-phase lines of a three-phase power supply, respectively. The shape of each contact 210 may be rectangular, circular, or other irregular shape. The size of each contact pad 210 may be selected based on the size of the three-phase wire, the terminal post 220, and the pivot 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 shape, size, material, and the like of the three contact pieces 210 are not limited in this embodiment 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. The post 220 may be solid or hollow. The material of the post 220 may be rigid plastic, or may be other materials such as stainless steel. The present embodiment does not set any limit to the size, structure, material, and the like of the post 220 as long as the function 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 to the control module 300, the first end of the rotating arm 230 is connected to the contact piece 210, and the second end of the rotating arm 230 is disposed at the center of the terminal 220 and connected to a single-phase user device when in use. The control module 300 is used for controlling the rotation of the rotating arm 230 so that the first end of the rotating arm 230 switches the connection between the contact pieces 210. The second end of the rotating arm 230 is arranged at the center of the terminal 220, so that the rotating arm 230 can be better connected with each contact piece 230 during the rotating process. The material of the rotation arm 230 may be a conductor such as copper or silver, and the material of the rotation arm 230 may be the same as or different from that of the contact piece 210. The shape of the rotating arm 230 may be a rectangular parallelepiped, a cylinder, or other irregular solid shapes, and the shape, material, etc. of the rotating arm 230 of this embodiment are not limited as long as the rotating arm 230 can be conducted when connected to the contact sheet 210. In one specific embodiment, three contact pads 210, contact a, contact B and contact C, are connected to phase a, phase B and phase C, respectively. Currently, the first end of the rotating arm 230 is connected to the a-contact pad, 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 unbalanced and the C phase is required to supply power to the single-phase user equipment, the control module 300 controls the rotating arm 230 to rotate, so that the first end of the rotating arm 230 is connected to the C contact piece.
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 pad 210.
In one embodiment, the three contact pieces 210 are disposed at equal angles along the center of the post 220, and the angle is 120 degrees. In other words, the angle between the line connecting the first contact piece and the center of the terminal 220, the line connecting the second contact piece and the center of the terminal 220, and the line connecting the third contact piece and the center of the terminal 220 are both 120 degrees. Thus, the control module 300 controls the rotating arm 230 to rotate from one contact piece to the other two contact pieces at the same distance, which is very convenient for the control module 300 to control the rotating arm 230.
Referring to fig. 3, in one embodiment, the phase switching device 10 further includes a tank module 400. The energy storage module 400 is connected to the control module 300, and is configured to supply power to the single-phase user equipment 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. The energy storage module 400 may be a device for storing electric energy, such as a storage battery, which is used to supply power when the three-phase power supply cannot supply power to the single-phase user equipment. The present embodiment does not limit the kind, structure, and the like of the energy storage module 400, as long as the function thereof can be realized. In the process of controlling the switching module 200 to switch from one phase of the three-phase power supply to another phase by the control module 300, the energy storage module 400 supplies power to the single-phase user equipment, so that the phenomenon of short power failure of the single-phase user equipment can be avoided, the work or 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 battery, a lead storage battery, a lithium battery, or the like. The present embodiment does not limit the kind of the battery 410, and the user can select the battery according to the actual requirement.
The detection circuit 420 is connected to the battery 410 for detecting the power of the battery 410. The detection circuit 420 may be a voltage detection circuit that detects the voltage of the battery 410 to characterize the charge of the battery 410. The charging circuit 430 is connected to the battery 410 for charging the battery 410. An input of the charging circuit 430 may be connected to a three-phase power source and an output 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 mains supply and input the mains supply into the rectifier; the rectifier converts the AC after voltage reduction into DC to be input to the voltage stabilizer; the voltage regulator 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 set any limit to the kind, structure, and the like of the detection circuit 420 and the charging circuit 430 as long as the functions thereof can be realized.
The inverter circuit 440 is connected to the battery 410, and is configured to convert the dc power of the battery 410 into ac power for supplying power to the single-phase user equipment. The output terminal 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 tube, and the frequency and voltage of the converted ac power may be adjusted by controlling the duty ratio of the switching tube. The present embodiment does not limit the kind, structure, and the like of the inverter circuit 440, as long as the function 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 source by the switching module 200 according to the determination result output by the control module 300. The controller 450 determines whether the charge level of the battery 410 is full after acquiring the charge level of the battery 410 detected by the detection circuit 420. In a specific embodiment, the detection circuit 420 may be a voltage detection circuit, and after acquiring the voltage of the battery 410 detected by the voltage detection circuit, if the voltage is equal to a preset threshold, the controller 450 indicates that the battery 410 is in a full state; if the voltage is less than the predetermined threshold, which indicates that the battery 410 is in an unfilled state, the controller 450 controls the charging circuit 430 to charge the battery 410, until the battery 410 is fully charged, and then controls the charging circuit 430 to stop charging. 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 process 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, and is configured to obtain the ac power and transmit the ac power 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 process of switching the output phase of the three-phase power source by the switching module 200 according to the alternating current. 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 satisfy the requirements of the single-phase user equipment. Specifically, the voltage of the alternating current is 220V, and the frequency is 50 HZ. If the voltage does not meet the requirement, the controller 450 may adjust the duty ratio of the switching tube in the inverter circuit 440, and change the voltage and frequency of the alternating current, so that the alternating current can meet the requirement of the single-phase user equipment. In this embodiment, the controller 450 may obtain the voltage and frequency of the ac power in time through the feedback circuit 460, and adjust the ac power input to the single-phase user equipment through controlling the inverter circuit 440, so that the reliability of the energy storage device 400 supplying power to the single-phase user equipment is improved, 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 the voltages of the three phase lines of the three-phase power supply. The control module 300 is further configured to determine whether the three-phase power is balanced according to the current of the three-phase line and the voltage of the three-phase line. The voltage detecting module 500 may include three voltage transformers respectively disposed on the phase lines a, B, and C of the three-phase power supply, and the three voltage transformers may detect voltages on the phase lines of each group. The present embodiment does not limit the specific type, arrangement and the like of the voltage detection module 500, as long as the function 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, it indicates that 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 indicates 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 supply is balanced according to the voltage of the three-phase line, and can detect whether the result determined by the power supply of the three-phase line is accurate, so that the control switching module 200, which can accurately control the control module 300, switches the output phase of the three-phase power supply to the single-phase user equipment, and further can improve the reliability and the practicability of the phase switching device 10.
With continued reference to fig. 5, in one embodiment, the phase switching device 10 further includes a zero crossing detection module 600. The zero-cross detection module 600 is connected to the three-phase power supply and control module 300, and is configured to detect an instantaneous voltage of a three-phase line 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 respectively disposed on three phase lines of the three-phase power supply, and may respectively detect instantaneous voltages on the respective phase lines. In one embodiment, three phases of the three-phase power source are unbalanced, and it is necessary to switch the output phase of the three-phase power source from the a phase to the B phase, so that 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, it is possible to prevent the switching module 200 from being damaged by an arc generated during the switching process, and thus the 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 apparatus provided in the foregoing 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 refers to one end of the three-phase power supply, wherein the phase line A, the phase line B and the phase line C 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 detailed description of the current detection module, reference may be made to the description in the phase switching device, and details are not repeated herein.
And S200, judging whether the three-phase power supply is balanced or not according to the current of the three-phase line.
The control module compares the acquired currents on the three phase lines, and if the currents on the phase line A, the phase line B and the phase line C are equal, the three phases of the three-phase power supply are in a balanced state; if the current of one phase line in the phase line A, the phase line B and the phase line C is not equal to the current of other phase lines, the three phases of the three-phase power supply are in an unbalanced state.
S300, if the three-phase power supply is unbalanced, the switching module is controlled to be switched to the 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.
The control module controls the switching module to switch the phase with the minimum current in the three-phase power supply if the three phases of the three-phase power supply are judged to be in an unbalanced state by comparing the currents on the three-phase lines, the phase with the minimum current represents that the load on the phase is small, and the phase is used for supplying power to single-phase user equipment, so that 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 a balanced state, the phase of the three-phase power supply for supplying power to the single-phase user equipment does 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, and the phase switching method has all the beneficial effects of the phase switching device, and is not described herein again.
Referring to fig. 7, in one embodiment, the method further includes:
and S400, acquiring current data of the three-phase line in a preset period.
And S500, analyzing the time point of three-phase unbalance of the three-phase power supply according to the current data.
S600, the switching module is controlled to switch the output phases of the three-phase power supply to the single-phase user equipment before the unbalanced time point of the three phases.
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 currents of the preset period acquired by the current detection module to form current data, and the control module analyzes the current data and judges the time point of three-phase unbalance of the three-phase power supply. The control module controls the switching module to switch the output phases of the three-phase power source to the single-phase user equipment before the time point of the three-phase imbalance, wherein the time point of the three-phase imbalance may be within one hour or two hours before the time point of the three-phase imbalance. In a specific embodiment, assuming that the preset period is one week, the control module may determine that the current on the three-phase line at 8 o' clock each day is in an unbalanced state according to the acquired current data within one week, and the current of the a-phase line is larger and the current of the C-phase line is smaller. The control module can control the switching module to switch the output phase of the three-phase power supply to the single-phase user equipment from the phase a to the phase C at 7 pm for 30 minutes. Like this, control switching module commutation in advance, can reduce the electric current and strike the surge at the state line switching phase of undercurrent to make switching phase more steady transition.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. 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 the three-phase line 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 used for judging whether the three phases of the three-phase power supply are balanced or not according to the current of the three-phase lines 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 judgment result.
2. The phase switching device of 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 binding post, the said three contact pieces are set up in the said binding post;
the swinging boom, the control end of swinging boom with the control module group is connected, the first end of swinging boom with the contact piece is connected, the second end of swinging boom set up in the centre of a circle of terminal, be used for with single-phase user equipment connects, the control module group is used for control the swinging boom is rotatory, makes the first end of swinging boom is each switch between the contact piece and connect.
3. The phase switching apparatus according to claim 2, wherein the three contact pieces are arranged at equal angles along a center of the post.
4. The phase switching device according to claim 1, further comprising:
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 phase of the three-phase power supply by the switching module according to the judgment result.
5. The phase-switching apparatus of claim 4, wherein the energy-storage module comprises:
a battery;
the detection circuit is connected with the battery and is used for detecting the electric quantity of the battery;
the charging circuit is connected with the battery and is used for charging the battery;
the inverter circuit is connected with the battery and is used for converting the direct current of the battery into alternating current;
the controller is connected with the detection circuit, the charging circuit, the inverter circuit and the control module and 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.
6. The phase-switching apparatus of claim 5, wherein the energy storage device further comprises:
the feedback circuit is connected with the inverter circuit and the controller and 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.
7. 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 the voltage detection module is used for detecting the voltage of three phase lines of the three-phase power supply;
the control module is further used for judging whether the three-phase power supply is balanced or not according to the current of the three-phase line and the voltage of the three-phase line.
8. 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 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.
9. A method of phase switching using the phase switching apparatus of any one of claims 1-8, comprising:
acquiring current of an output end of a three-phase line of a three-phase power supply;
judging whether the three-phase power supply is balanced or not according to the current of the three-phase line;
and if the three-phase power supply is unbalanced, controlling the switching module to switch to the 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 single-phase user equipment.
10. The method of claim 9, further comprising:
acquiring current data of the three-phase line 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 the three-phase unbalance.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196604A1 (en) * | 2003-04-04 | 2004-10-07 | Tmt & D Corporation | Control system for canceling load unbalance of three-phase circuit |
| TWI560968B (en) * | 2015-10-13 | 2016-12-01 | Ind Tech Res Inst | Polyphase power dispatching system and method |
| WO2017009921A1 (en) * | 2015-07-13 | 2017-01-19 | 株式会社日立製作所 | Power distributor and power distribution method |
| CN108365619A (en) * | 2018-05-03 | 2018-08-03 | 广东电网有限责任公司 | Three-phase unbalanced phase-changing device |
| CN108400605A (en) * | 2018-01-16 | 2018-08-14 | 湖南四海中能电力科技有限公司 | A kind of charging power distribution control method and system with intelligent monitoring function |
| CN208046249U (en) * | 2018-05-03 | 2018-11-02 | 广东电网有限责任公司 | Three-phase unbalanced phase-changing device |
| CN109193712A (en) * | 2018-11-22 | 2019-01-11 | 国网山东省电力公司莱西市供电公司 | A kind of distribution station arrangement of the three-phase load unbalance adjust automatically of no off interval |
| CN112018788A (en) * | 2020-08-28 | 2020-12-01 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced automatic commutation system |
-
2020
- 2020-10-27 CN CN202011165188.7A patent/CN112583031B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040196604A1 (en) * | 2003-04-04 | 2004-10-07 | Tmt & D Corporation | Control system for canceling load unbalance of three-phase circuit |
| WO2017009921A1 (en) * | 2015-07-13 | 2017-01-19 | 株式会社日立製作所 | Power distributor and power distribution method |
| TWI560968B (en) * | 2015-10-13 | 2016-12-01 | Ind Tech Res Inst | Polyphase power dispatching system and method |
| CN108400605A (en) * | 2018-01-16 | 2018-08-14 | 湖南四海中能电力科技有限公司 | A kind of charging power distribution control method and system with intelligent monitoring function |
| CN108365619A (en) * | 2018-05-03 | 2018-08-03 | 广东电网有限责任公司 | Three-phase unbalanced phase-changing device |
| CN208046249U (en) * | 2018-05-03 | 2018-11-02 | 广东电网有限责任公司 | Three-phase unbalanced phase-changing device |
| CN109193712A (en) * | 2018-11-22 | 2019-01-11 | 国网山东省电力公司莱西市供电公司 | A kind of distribution station arrangement of the three-phase load unbalance adjust automatically of no off interval |
| CN112018788A (en) * | 2020-08-28 | 2020-12-01 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced automatic commutation system |
Non-Patent Citations (2)
| Title |
|---|
| 曹磊 等: "基于无缝换相装置的三相负荷不平衡治理", 《电力科学与技术学报》 * |
| 曹磊 等: "基于无缝换相装置的三相负荷不平衡治理", 《电力科学与技术学报》, vol. 35, no. 4, 31 July 2020 (2020-07-31), pages 99 - 106 * |
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