CN211508631U - Unbalanced three-phase commutation device and commutation system - Google Patents
Unbalanced three-phase commutation device and commutation system Download PDFInfo
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- CN211508631U CN211508631U CN202020145585.7U CN202020145585U CN211508631U CN 211508631 U CN211508631 U CN 211508631U CN 202020145585 U CN202020145585 U CN 202020145585U CN 211508631 U CN211508631 U CN 211508631U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides an unbalanced three phase commutation device and commutation system, the device includes: the phase change switch comprises a one-way conductive device, a switch module and a switch control module, the switch control module controls the switch module in the phase change switch according to a received control instruction, wherein the control instruction is determined by the main controller according to the unbalance degree of a three-phase circuit, the access phase sequence of the at least one phase change switch and the load condition, and phase switching is realized through the phase change switch. The unidirectional conductive device in the phase change switch plays a role in follow current in the phase change switching process so as to guarantee continuous power supply to a load, and meanwhile, the unidirectional conductive device effectively avoids arc discharge generated in the phase change switching process, further avoids damage to a switch contact, improves switching efficiency, and improves the switching effect of adjusting three-phase imbalance.
Description
Technical Field
The utility model relates to an electrical technology field especially relates to an unbalanced three phase commutation device and commutation system.
Background
At present, a three-phase four-wire system wiring mode is generally adopted in a low-voltage distribution system in China, and due to the defects of early power grid planning design, the condition that a large number of single-phase loads are concentrated in a single phase or two phases occurs, and the unbalanced loads can cause three-phase imbalance of the distribution system, so that the three-phase voltage or current of a power supply system is unbalanced.
In the current prior art, a method of manually switching a single-phase load is generally adopted to adjust three-phase imbalance of a power distribution system.
However, the current existing method for adjusting three-phase balance needs to stop supplying power to the load first, and perform adjustment operation under the condition of power failure, which seriously affects the power utilization effect of users, and the switching efficiency is relatively low.
SUMMERY OF THE UTILITY MODEL
The utility model provides an unbalanced three phase commutation device and commutation system to solve the relatively poor technical problem of unbalanced three phase regulating effect among the prior art.
The utility model discloses a first aspect provides an unbalanced three phase commutation device, including at least one commutation switch and main control unit, commutation switch includes: the switch comprises a unidirectional conductive device, a switch module and a switch control module;
the unidirectional conductive device includes: a positive terminal and a negative terminal;
the switch module includes: the first switch, the second switch, the third switch, the fourth switch and the fifth switch;
wherein the first switch comprises a first terminal, a second terminal and a third terminal, the second switch comprises a fourth terminal, a fifth terminal and a sixth terminal, the third switch comprises a seventh terminal, an eighth terminal and a ninth terminal, the fourth switch comprises a tenth terminal, a tenth terminal and a tenth terminal, and the fifth switch comprises a tenth terminal and a fourteenth terminal;
the positive end of the unidirectional conductive device is connected with the seventh end, the negative end of the unidirectional conductive device is connected with the fourteenth end, the first end is connected with the eighth end, the second end is connected with a power supply A, the third end is connected with a power supply B, the fourth end is connected with the twelfth end, the fifth end is connected with the power supply B, the sixth end is connected with a power supply C, the ninth end is connected with the fourth end, the tenth end is connected with a load, the tenth end is connected with the first end, the tenth end is connected with the fourth end, and the thirteenth end is connected with the load;
the switch control module is connected with the main controller, and the switch control module is connected with the switch module.
Optionally, the connection is an electrical connection.
Optionally, the unidirectional conducting device is a diode.
Optionally, the first switch, the second switch, the third switch, and the fourth switch are all single-pole double-throw switches.
Optionally, the main controller is configured to collect three-phase currents and zero line currents, and determine the degree of unbalance according to the three-phase currents and the zero line currents.
Optionally, the switch control module is configured to collect an access phase sequence and a load condition of the at least one phase change switch, and send the access phase sequence and the load condition of the at least one phase change switch to the main controller.
Optionally, the main controller determines a commutation scheme according to the imbalance, the access phase sequence of the at least one commutation switch, and a load condition;
determining the control instruction according to the commutation scheme;
and sending the control instruction to the switch control module, and controlling the switch module by the switch control module according to the control instruction.
Optionally, the phase change switch is controlled to perform a phase change process based on the switch module.
Optionally, the main controller and the switch control module perform wireless communication based on a power line carrier.
The utility model discloses a second aspect provides a commutation system, including the unbalanced three phase commutation device that the first aspect provided.
The utility model provides a pair of unbalanced three phase commutation device and commutation system, including at least one commutation switch and main control unit, the commutation switch includes: the switch comprises a unidirectional conductive device, a switch module and a switch control module; the unidirectional conductive device includes: a positive terminal and a negative terminal; the switch module includes: the first switch, the second switch, the third switch, the fourth switch and the fifth switch; wherein the first switch comprises a first terminal, a second terminal and a third terminal, the second switch comprises a fourth terminal, a fifth terminal and a sixth terminal, the third switch comprises a seventh terminal, an eighth terminal and a ninth terminal, the fourth switch comprises a tenth terminal, a tenth terminal and a tenth terminal, and the fifth switch comprises a tenth terminal and a fourteenth terminal; the positive end of the unidirectional conductive device is connected with the seventh end, the negative end of the unidirectional conductive device is connected with the fourteenth end, the first end is connected with the eighth end, the second end is connected with a power supply A, the third end is connected with a power supply B, the fourth end is connected with the twelfth end, the fifth end is connected with the power supply B, the sixth end is connected with a power supply C, the ninth end is connected with the fourth end, the tenth end is connected with a load, the tenth end is connected with the first end, the tenth end is connected with the fourth end, and the thirteenth end is connected with the load; the switch control module is connected with the main controller, and the switch control module is connected with the switch module. The embodiment of the utility model provides an in, when carrying out unbalanced three phase regulation based on this unbalanced three phase commutation device, on-off control module is according to received control instruction, the disconnection and the closure of each switch in the control the device, and in the switching process, one-way conductive device plays the effect of afterflow to guarantee to continuously supply power to load, and avoid the switch contact to appear damaging, improved switching efficiency simultaneously, improved the switching effect when adjusting unbalanced three phase.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
Fig. 1 is a schematic structural diagram of a three-phase unbalanced phase-change device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a phase change switch according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another phase change switch according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another phase change switch according to an embodiment of the present invention.
Reference numerals:
10-a phase change switch; 20-a main controller; 101-unidirectional conducting device;
102-a switch module; 103-a switch control module; 1011-positive terminal;
1012-negative terminal; 104-a first diode; 105-a second diode;
106-third diode; 1041-a first positive terminal; 1042 — a first negative terminal;
1051-a second positive terminal; 1052-second negative terminal; 1061-third positive terminal;
1062-third negative terminal; 1021-a first switch; 1022 — a second switch;
1023-a third switch; 1024 — a fourth switch; 1025-fifth switch;
1026-sixth switch; 1027-seventh switch; 1028-an eighth switch;
1029-ninth switch; 102(10) -a tenth switch; 102(11) -an eleventh switch;
102(12) -a twelfth switch; 102(13) -a thirteenth switch; 102(14) -a fourteenth switch;
10211-first end; 10212-second end; 10213-third end;
10221-fourth end; 10222-fifth terminal; 10223-sixth terminal;
10231-a seventh terminal; 10232-eighth end; 10233-ninth end;
10241-tenth end; 10242-eleventh end; 10243-twelfth end;
10251-a thirteenth terminal; 10252-fourteenth end; 10261-fifteenth end;
10262-sixteenth end; 10271-seventeenth end; 10272-eighteenth end;
10281-nineteenth end; 10282-twentieth end; 10291-twentieth end;
10292-twenty second end; 10293-twenty-third end; 102(10) 1-twenty-fourth end;
102(10) 2-twenty-fifth end; 102(11) 1-twenty-sixth end;
102(11) 2-twenty-seventh end; 102(11) 3-twenty-eight ends;
102(12) 1-twenty-ninth end; 102(12) 2-thirtieth end;
102(13)1 st to thirtieth ends; 102(13) 2-thirtieth end;
102(13) 3-thirty-third terminal; 102(14) four thirtieth terminals;
102(14) 2-thirty-fifth terminal.
With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the invention by those skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the following examples, "plurality" means two or more unless specifically limited otherwise.
The embodiment of the utility model provides an in provide an unbalanced three phase commutation device and commutation system is applicable to and improves the switching effect of adjusting unbalanced three phase to satisfy user's power consumption demand constantly. Current unbalanced three phase adjustment mode needs to cut off the power supply before adjusting, stops the power supply to the load promptly, carries out artifical the regulation under the condition that stops the power supply, leads to can't satisfy user's power consumption demand when adjusting, and switches efficiency lower.
Therefore, the utility model provides an unbalanced three phase commutation device and commutation system to solve the relatively poor technical problem of unbalanced three phase adjustment effect among the prior art, guarantee the load and do not fall the electricity when switching the phase place, and improve phase place switching efficiency.
Specifically, the embodiment of the utility model provides an unbalanced three phase commutation device includes at least one commutation switch and main control unit, and commutation switch includes one-way conductive device, switch module and on-off control module, and on-off control module is according to received control command, the switch module in the control commutation switch, and wherein, control command is that main control unit is confirmed according to the access phase sequence and the load condition of three-phase circuit's unbalance degree, at least one commutation switch, and then realizes the phase place through commutation switch. Wherein, at the in-process that carries out the phase place switching, the one-way conducting device in this commutation switch has played the effect of afterflow to guarantee can continuously supply power to the load, this one-way conducting device has effectively avoided the commutation switch to produce the arc that draws when carrying out the commutation in-process simultaneously, and then has avoided the switch contact to appear damaging, has improved switching efficiency, and has improved the switching effect when adjusting the unbalanced three-phase.
The embodiment provides an unbalanced three phase commutation device for solve the technical problem that the unbalanced three phase adjustment effect is relatively poor among the prior art.
As shown in fig. 1, a schematic structural diagram of a three-phase unbalanced phase-changing apparatus provided in this embodiment includes: at least one commutation switch 10 and a main controller 20, the commutation switch 10 comprising: a unidirectional current conducting device 101, a switch module 102 and a switch control module 103;
as shown in fig. 2, for the schematic diagram of the commutation switch provided in this embodiment, the unidirectional conductive device 101 includes a positive terminal 1011 and a negative terminal 1012; the switch module 102 includes a first switch 1021, a second switch 1022, a third switch 1023, a fourth switch 1024, and a fifth switch 1025; wherein the first switch 1021 includes a first terminal 10211, a second terminal 10212 and a third terminal 10213, the second switch 1022 includes a fourth terminal 10221, a fifth terminal 10222 and a sixth terminal 10223, the third switch 1023 includes a seventh terminal 10231, an eighth terminal 10232 and a ninth terminal 10233, the fourth switch 1024 includes a tenth terminal 10241, an eleventh terminal 10242 and a twelfth terminal 10243, and the fifth switch 1025 includes a thirteenth terminal 10251 and a fourteenth terminal 10252. The positive terminal 1011 of the unidirectional conductive device 101 is connected to the seventh terminal 10231, the negative terminal 1012 of the unidirectional conductive device 101 is connected to the fourteenth terminal 10252, the first terminal 10211 is connected to the eighth terminal 10232, the second terminal 10212 is connected to the power supply a, the third terminal 10213 is connected to the power supply B, the fourth terminal 10221 is connected to the twelfth terminal 10243, the fifth terminal 10222 is connected to the power supply B, the sixth terminal 10223 is connected to the power supply C, the ninth terminal 10233 is connected to the fourth terminal 10221, the tenth terminal 10241 is connected to the load, the eleventh terminal 10242 is connected to the first terminal 10211, the twelfth terminal 10243 is connected to the fourth terminal 10221, and the thirteenth terminal 10251 is connected to the load;
the switch control module 103 is connected to the main controller 20, and the switch control module 103 is connected to the switch module 102.
The first switch, the second switch, the third switch and the fourth switch are all single-pole double-throw switches.
Alternatively, the first switch, the second switch, the third switch, the fourth switch, and the fifth switch may be magnetic latching relay switches.
Optionally, based on the switch module, the commutation switch is controlled to perform commutation processing, and an internal structure in the commutation switch may be a topological structure.
Optionally, the connections are all electrical connections.
Wherein the electrical connection comprises a radio electromagnetic wave connection and a wire connection.
Optionally, the unidirectional conducting device is a diode.
Specifically, the positive terminal of the diode is connected with the seventh terminal, and the negative terminal of the diode is connected with the fourteenth terminal.
Optionally, the main controller is configured to collect three-phase currents and zero line currents, and determine the degree of unbalance according to the three-phase currents and the zero line currents.
Specifically, the main controller collects a three-phase current signal and a zero line current signal through a current transformer, determines a three-phase current according to the three-phase current signal, determines a zero line current according to the zero line current signal, and finally determines the unbalance of the three phases according to the three-phase current and the zero line current, namely determines the unbalance of the distribution transformer.
Optionally, the switch control module is configured to collect an access phase sequence and a load condition of at least one phase change switch, and send the access phase sequence and the load condition of the at least one phase change switch to the main controller.
Optionally, the main controller determines a commutation scheme according to the unbalance, the access phase sequence of the at least one commutation switch and the load condition; determining a control instruction according to the commutation scheme; and sending the control instruction to the switch control module, and controlling the switch module by the switch control module according to the control instruction.
Wherein, a switch control module can control two and above commutation switches, and a switch control module can control the switch module in different commutation switches promptly.
Optionally, the main controller and the switch control module communicate wirelessly based on a power line carrier.
Specifically, the main controller judges whether phase switching is required according to the magnitude relation between the unbalance and a preset unbalance threshold, and if the unbalance is larger than the preset unbalance threshold, the three-phase circuit is determined to be required to be subjected to the phase switching. And determining a switching scheme, namely determining whether the phase A is switched to the phase B or the phase B is switched to the phase C according to the access phase sequence and the load condition of a phase change switch in the three-phase circuit. And finally, determining a control instruction according to the determined switching scheme, sending the control instruction to a switch control module based on the power line carrier, and controlling the switch module in the commutation switch by the switch control module according to the control instruction so as to carry out commutation operation.
Wherein, in the process of supplying power to the load, the other end of the load is always connected with a ground wire (N wire) to form a complete loop.
For example, if the switching scheme determined by the main controller is to switch from the phase a to the phase B, and the first switch in the current commutation switch is closed at the second end, the second end is connected to the phase a of the power supply, the second switch is closed at the sixth end, the sixth end is connected to the phase C of the power supply, the third switch is closed at the eighth end, the eighth end is connected to the first end of the first switch, the fourth switch is closed at the eleventh end, that is, the tenth end is connected to the eleventh end, the first end of the eleventh connection is opened, and then the fifth switch is opened, that is, the load is supplied by the phase a of the power supply. When a switch control module in the phase change switch receives a control instruction for switching the phase A to the phase B, the fifth switch is controlled to be closed, namely the thirteenth end is connected with the fourteenth end. And if the current phase voltage of the power supply A is greater than 0, controlling the fourth switch to be switched to the twelfth end, namely the tenth end is connected with the twelfth end, transmitting the current of the power supply A phase to the diode branch circuit, and supplying power to the load by the power supply A phase. When the phase voltage of the power supply B is larger than the phase voltage of the power supply A, the second switch is controlled to be closed to the fifth end, namely the fourth end is connected with the fifth end, at the moment, the diode is in a cut-off state, the phase current of the power supply A is cut off based on the diode branch, and therefore the load is supplied with power by the phase voltage of the power supply B. Before the phase voltage of the power supply B is smaller than the phase voltage of the power supply A, the third switch is controlled to be closed at the ninth end, namely the seventh end is connected with the ninth end, and at the moment, no current exists in the third switch, so that arc discharge cannot be generated when the closed end of the switch is switched, and then the fifth switch is switched off to finish phase switching.
Fig. 3 is a schematic structural diagram of another phase change switch provided in this embodiment.
As a practical manner, the commutation switch 10 can optionally include a first switch 1021, a second switch 1022, a fifth switch 1025, a sixth switch 1026, a seventh switch 1027, an eighth switch 1028, a first diode 104, a second diode 105, and a switch control module 103.
Wherein, the first switch 1021 includes a first terminal 10211, a second terminal 10212 and a third terminal 10213, the second switch 1022 includes a fourth terminal 10221, a fifth terminal 10222 and a sixth terminal 10223, the fifth switch 1025 includes a thirteenth terminal 10251 and a fourteenth terminal 10252, the sixth switch 1026 includes a fifteenth terminal 10261 and a sixteenth terminal 10262, the seventh switch 1027 includes a seventeenth terminal 10271 and an eighteenth terminal 10272, the eighth switch 1028 includes a nineteenth terminal 10281 and a twentieth terminal 10282, the first diode 104 includes a first positive terminal 1041 and a first negative terminal 1042, and the second diode 105 includes a second positive terminal 1051 and a second negative terminal 1052.
The second terminal 10212 is connected to a phase a of a power supply, the third terminal 10213 is connected to a phase B of the power supply, the fifth terminal 10222 is connected to a phase B of the power supply, the sixth terminal 10223 is connected to a phase C of the power supply, the first terminal 10211 is connected to the first positive terminal 2071, the first terminal 10211 is connected to the sixteenth terminal 10262, the fourth terminal 10221 is connected to the second positive terminal 1051, the fourth terminal 10221 is connected to the eighteenth terminal 10272, the fourteenth terminal 10252 is connected to the first negative terminal 1042, the twentieth terminal 10282 is connected to the second negative terminal 1052, and the thirteenth terminal 10251, the fifteenth terminal 10261, the seventeenth terminal 10271 and the nineteenth terminal 10281 are all connected to a load.
For example, if the control instruction received by the switch control module is that the phase of the power supply a is switched to the phase of the power supply B, and at this time, the first switch is closed at the second end, that is, the first end is connected to the second end, the second switch is closed at the sixth end, that is, the fourth end is connected to the sixth end, the sixth switch is closed, and the fifth switch, the seventh switch and the eighth switch are in the off state, then the fifth switch is controlled to be closed, that is, the thirteenth end is connected to the fourteenth end. When the phase voltage of the power supply A is larger than 0, the sixth switch is controlled to be switched off, the fifth switch is controlled to be switched on, the current of the phase A of the power supply is transmitted to the first diode branch, the load is still supplied with power by the phase A of the power supply, the second switch is controlled to be switched on to the fifth end, when the phase voltage of the phase B of the power supply is larger than the phase voltage of the phase A of the power supply, the eighth switch is controlled to be switched on, namely the nineteenth end is connected with the twentieth end, the first diode is controlled to be in a cut-off state, and the second diode is controlled to be in. And controlling the fifth switch to be switched off, supplying power by the second diode branch at the moment, controlling the seventh switch to be switched on to construct a second diode branch bypass, supplying power to a load on the basis of the second diode branch bypass, supplying power to the load by the power supply B phase at the moment, and finally controlling the eighth switch to be switched on and off to complete phase switching. The first diode branch and the second diode branch are used as intermediate states for switching phases, so that the phase change switch can naturally switch the phases at the cross points of phase voltage waveforms, continuous power supply to loads in the phase switching process is further guaranteed, phase switching efficiency is improved, arcing cannot be generated when the closed end of the switch is switched, and the switch contact is guaranteed not to be damaged.
Fig. 4 is a schematic structural diagram of another phase change switch provided in this embodiment.
As another practical way, the commutation switch 10 can optionally include a ninth switch 1029, a tenth switch 102(10), an eleventh switch 102(11), a twelfth switch 102(12), a thirteenth switch 102(13), a fourteenth switch 102(14), a first diode 104, a second diode 105, a third diode 106, and a switch control module 103.
Wherein the ninth switch 1029 comprises a twentieth terminal 10291, a twentieth terminal 10292 and a twentieth terminal 10293, the tenth switch 102(10) comprises a twentieth fourth terminal 102(10)1 and a twentieth fifth terminal 102(10)2, the eleventh switch 102(11) comprises a twenty-sixth terminal 102(11)1, a twenty-seventh terminal 102(11)2 and a twenty-eighth terminal 102(11)3, the twelfth switch 102(12) comprises a twenty-ninth terminal 102(12)1 and a thirtieth terminal 102(12)2, the thirteenth switch 102(13) comprises a thirtieth terminal 102(13)1, a thirtieth terminal 102(13)2 and a thirty-third terminal 102(13)3, the fourteenth switch 102(14) comprises a thirty-fourth terminal 102(14)1 and a thirty-fifth terminal 102(14)2, the first diode 104 comprises a first positive terminal 1041 and a first negative terminal 1042, the second diode 105 comprises a second positive terminal 1052 and a second negative terminal 1052, the third diode 106 includes a third positive terminal 1061 and a third negative terminal 1062.
The twentieth terminal 10291 is connected to the first negative terminal 1042, the twentieth terminal 10292 is connected to a load, the twentieth terminal 10293 is connected to the power a phase, the twentieth terminal 102(10)1 is connected to the first positive terminal 1041, the twenty-fifth terminal 102(10)2 is connected to the power a phase, the twenty-sixth terminal 102(11)1 is connected to the second negative terminal 1052, the twenty-seventh terminal 102(11)2 is connected to the first negative terminal 1042, the twenty-eighteenth terminal 102(11)3 is connected to the power B phase, the twenty-ninth terminal 102(12)1 is connected to the second positive terminal 1051, the thirtieth terminal 102(12)2 is connected to the power B phase, the thirtieth terminal 102(13)1 is connected to the load and the third negative terminal 1062, the thirty-second terminal 102(13)2 is connected to the second negative terminal 1052, the thirty-third terminal 102(13)3 is connected to the power C phase, and the thirty-fourth terminal 102(14)1 is connected to the third positive terminal 1061 and the thirty-fifth terminal.
Illustratively, if the control instruction received by the switch control module is that the power supply a phase is switched to the power supply B phase, and at this time, the ninth switch is closed at the twentieth end, that is, the twentieth end is connected to the twentieth end, the eleventh switch is closed at the twenty-seventh end, that is, the twenty-sixth end is connected to the twenty-seventh end, the thirteenth switch is closed at the thirtieth end, that is, the thirtieth end is connected to the thirtieth end, the tenth switch, the twelfth switch and the fourteenth switch are all in an off state, and the load is supplied with power by the power supply a phase. At the moment, the tenth switch is controlled to be closed, namely the twenty-fifth end is connected with the twenty-fourth end, when the voltage of the phase A of the power supply is greater than 0, the ninth switch is controlled to be closed to the twenty-fifth end, the first diode is in a conducting state, and at the moment, the current of the phase A of the power supply is transmitted to a load based on the first diode branch; the twelfth switch is controlled to be closed, namely the twenty ninth end is connected with the thirtieth end, when the voltage of the power supply B phase is greater than the voltage of the power supply A phase, the second diode is in a conducting state, the first diode is switched to a cut-off state, the current of the power supply B phase is transmitted to a load on the basis of the second diode branch circuit, and at the moment, the load is supplied with power by the power supply B phase; when the load is powered by the power supply B phase based on the second diode branch circuit, the eleventh switch is controlled to be closed to the twenty-eighth end, namely the twenty-sixth end is connected with the twenty-eighth end to construct a second diode branch circuit bypass, so that the power supply B phase supplies power to the load based on the second diode branch circuit bypass, and finally the tenth switch and the twelfth switch are disconnected. The first diode branch and the second diode branch are used as intermediate states of the switching phases, so that the phase change switch can naturally switch the phases at the crossing points of the phase voltage waveforms. The phase change switch is of a topological structure, a topological main loop is composed of a ninth switch, an eleventh switch and a thirteenth switch (three single-pole double-throw switches), only one relative load is guaranteed to supply power at any time, and interphase short circuit is avoided.
The three-phase unbalanced phase change device that this embodiment provided includes at least one commutation switch and main control unit, and the commutation switch includes: the switch comprises a unidirectional conductive device, a switch module and a switch control module; the unidirectional conductive device includes: a positive terminal and a negative terminal; the switch module includes: the first switch, the second switch, the third switch, the fourth switch and the fifth switch; the first switch comprises a first end, a second end and a third end, the second switch comprises a fourth end, a fifth end and a sixth end, the third switch comprises a seventh end, an eighth end and a ninth end, the fourth switch comprises a tenth end, a tenth end and a twelfth end, and the fifth switch comprises a thirteenth end and a fourteenth end; the positive end of the unidirectional conductive device is connected with the seventh end, the negative end of the unidirectional conductive device is connected with the fourteenth end, the first end is connected with the eighth end, the second end is connected with the power supply A, the third end is connected with the power supply B, the fourth end is connected with the twelfth end, the fifth end is connected with the power supply B, the sixth end is connected with the power supply C, the ninth end is connected with the fourth end, the tenth end is connected with the load, the tenth end is connected with the first end, the tenth end is connected with the fourth end, and the thirteenth end is connected with the load; the switch control module is connected with the main controller and the switch control module is connected with the switch module. The embodiment of the utility model provides an in, when carrying out unbalanced three phase regulation based on this unbalanced three phase commutation device, on-off control module is according to received control instruction, the disconnection and the closure of each switch in the control the device, and at the switching in-process, one-way conductive device plays the effect of afterflow to guarantee to continuously supply power to load, and avoid the switch contact to appear damaging, improved switching efficiency simultaneously, improved the switching effect of adjusting unbalanced three phase.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. A three-phase unbalanced phase change device comprising at least one phase change switch and a main controller, wherein the phase change switch comprises: the switch comprises a unidirectional conductive device, a switch module and a switch control module;
the unidirectional conductive device includes: a positive terminal and a negative terminal;
the switch module includes: the first switch, the second switch, the third switch, the fourth switch and the fifth switch;
wherein the first switch comprises a first terminal, a second terminal and a third terminal, the second switch comprises a fourth terminal, a fifth terminal and a sixth terminal, the third switch comprises a seventh terminal, an eighth terminal and a ninth terminal, the fourth switch comprises a tenth terminal, a tenth terminal and a tenth terminal, and the fifth switch comprises a tenth terminal and a fourteenth terminal;
the positive end of the unidirectional conductive device is connected with the seventh end, the negative end of the unidirectional conductive device is connected with the fourteenth end, the first end is connected with the eighth end, the second end is connected with a power supply A, the third end is connected with a power supply B, the fourth end is connected with the twelfth end, the fifth end is connected with the power supply B, the sixth end is connected with a power supply C, the ninth end is connected with the fourth end, the tenth end is connected with a load, the tenth end is connected with the first end, the tenth end is connected with the fourth end, and the thirteenth end is connected with the load;
the switch control module is connected with the main controller, and the switch control module is connected with the switch module.
2. The device of claim 1, wherein the connection is an electrical connection.
3. The apparatus of claim 1, wherein the unidirectional conducting device is a diode.
4. The apparatus of claim 1, wherein the first switch, the second switch, the third switch, and the fourth switch are single pole, double throw switches.
5. The apparatus of claim 1, wherein the master controller is configured to collect three-phase currents and a neutral current, and determine the degree of imbalance based on the three-phase currents and the neutral current.
6. The device of claim 1, wherein the switch control module is configured to collect an access phase sequence and a load condition of the at least one phase change switch, and send the access phase sequence and the load condition of the at least one phase change switch to the master controller.
7. The device according to any one of claims 1-6, wherein the commutation switch is controlled to perform a commutation process based on the switch module.
8. The apparatus of any of claims 1-6, wherein the master controller and the switch control module communicate wirelessly based on a power line carrier.
9. A commutation system comprising a three-phase unbalanced commutation apparatus as claimed in any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112886617A (en) * | 2021-02-03 | 2021-06-01 | 华南理工大学 | Commutation control method and system based on BPSO algorithm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112886617A (en) * | 2021-02-03 | 2021-06-01 | 华南理工大学 | Commutation control method and system based on BPSO algorithm |
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