CN115065072A - Load phase selection device - Google Patents
Load phase selection device Download PDFInfo
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- CN115065072A CN115065072A CN202210718961.0A CN202210718961A CN115065072A CN 115065072 A CN115065072 A CN 115065072A CN 202210718961 A CN202210718961 A CN 202210718961A CN 115065072 A CN115065072 A CN 115065072A
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- phase
- phase selection
- load
- selection execution
- bus
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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
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention discloses a load phase selection device. The load phase selection device comprises: the load detection module is used for acquiring the three-phase current of the bus in real time; the central control module is connected with the load detection module and used for calculating three-phase unbalanced current according to the three-phase current of the bus and generating a phase selection execution command according to the three-phase unbalanced current; and the phase selection execution module is connected with the central control module and is used for accessing the load to one phase with the minimum three-phase current in the bus according to the phase selection execution command. According to the technical scheme of the embodiment of the invention, the load detection module is used for acquiring the three-phase current of the bus in real time, the central control module is used for calculating the three-phase unbalanced current according to the three-phase current of the bus and generating the phase selection execution command, and the phase selection execution module is used for controlling the load to be connected to the phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the unbalanced load is balanced, and the generation of the three-phase unbalanced current is reduced.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a load phase selection device.
Background
The reliability of the power utilization of the alternating current station of the transformer substation is important for guaranteeing the normal operation of alternating current loads and direct current power supplies in the station, but because the power utilization accessed by each feeder line is different, the load distribution is uneven, and the power utilization load of the station is in a state of unbalanced three-phase current for a long time, the voltage loss of an alternating current bus in the station is easily caused.
Aiming at uneven distribution of three-phase loads of station power utilization, the mode of manually distributing the three-phase loads is usually adopted for adjustment at present, manual adjustment of load distribution can only be adjusted according to the current load condition, some standby single-phase power utilization equipment in a station is temporarily started, and particularly during temporary connection of single-phase load equipment, large unbalanced current is usually caused.
Disclosure of Invention
The invention provides a load phase selection device, which aims to realize balanced unbalanced load and reduce the generation of three-phase unbalanced current.
In order to realize the technical problem, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a load phase selection device, including:
the load detection module is used for acquiring the three-phase current of the bus in real time;
the central control module is connected with the load detection module and used for calculating three-phase unbalanced current according to the three-phase current of the bus and generating a phase selection execution command according to the three-phase unbalanced current;
and the phase selection execution module is connected with the central control module and is used for accessing the load to one phase with the minimum three-phase current in the bus according to the phase selection execution command.
Optionally, the phase selection execution module includes a first phase selection execution unit;
the first phase selection execution unit is configured to switch a temporary power supply into one phase with the minimum three-phase current in the bus according to a phase selection execution command.
Optionally, the first phase selection execution unit is configured to be manually turned on or off.
Optionally, the first phase selection execution unit includes a locking unit, and the first phase selection execution unit is configured to be locked by the locking unit after executing the phase selection execution command, so as to prohibit execution of a new phase selection execution command.
Optionally, the phase selection execution module further includes a second phase selection execution unit;
and the second phase selection execution unit is configured to access the online load to be accessed to the phase with the minimum three-phase current in the bus according to the phase selection execution command.
Optionally, the second phase selection execution unit is configured to automatically start according to the received phase selection execution command.
Optionally, the second phase selection execution unit is configured to access the online load to be accessed to the phase with the minimum three-phase current in the bus if the three-phase unbalanced current is greater than or equal to a preset value.
Optionally, the phase selection execution module includes a contactor connected between the bus and the load, and the contactor is configured to control the conducting state of the load and each phase power line in the bus by the central control module;
or, the phase selection execution module comprises a thyristor, the thyristor is connected between the bus and the load, and the thyristor is configured to control the conduction state of the load and each phase power line in the bus by the central control module.
Optionally, the load phase selection device further includes:
and the central control module is in communication connection with the phase selection execution module through the communication module.
Optionally, the load phase selection device further includes:
and the interaction module is connected with the central control module and is used for carrying out data interaction with the central control module.
According to the technical scheme of the embodiment of the invention, the load detection module is used for acquiring the three-phase current of the bus in real time, the central control module is used for calculating the three-phase unbalanced current according to the three-phase current of the bus and generating the phase selection execution command, and the phase selection execution module is used for controlling the load to be connected to the phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the unbalanced load is balanced, and the generation of the three-phase unbalanced current is reduced.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a load phase selection device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a phase selection execution module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another load phase selection device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another load phase selection device according to an embodiment of the present invention.
In the figure:
the system comprises a load detection module 1, a central control module 2, a phase selection execution module 3, a contactor 31, a thyristor 32, a communication module 4 and an interaction module 5.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a load phase selection device according to an embodiment of the present invention, which is applicable to power systems such as a transformer substation and an ac station. Referring to fig. 1, the apparatus includes:
the load detection module 1 is used for acquiring three-phase current of a bus in real time;
the central control module 2 is connected with the load detection module 1 and used for calculating three-phase unbalanced current according to the three-phase current of the bus and generating a phase selection execution command according to the three-phase unbalanced current;
and the phase selection execution module 3 is connected with the central control module 2 and is used for accessing the load to one phase with the minimum three-phase current in the bus according to the phase selection execution command.
Specifically, the three-phase imbalance means that the amplitudes of three-phase currents or voltages in the power system are inconsistent, and the amplitude difference exceeds a specified range. After the load detection module 1 collects the three-phase current of the bus in real time, the central control module 2 compares the phase with the minimum load and the phase with the maximum load according to the three-phase current of the bus, namely the phase with the minimum current and the phase with the maximum current, calculates the three-phase unbalanced current, generates a phase selection execution command according to the three-phase unbalanced current, and the phase selection execution module 3 accesses the load into the phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the three-phase load is more balanced, and the generation of the three-phase unbalanced current is reduced.
According to the technical scheme of the embodiment of the invention, the load detection module is used for acquiring the three-phase current of the bus in real time, the central control module is used for calculating the three-phase unbalanced current according to the three-phase current of the bus and generating the phase selection execution command, and the phase selection execution module is used for controlling the load to be connected to the phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the unbalanced load is balanced, and the generation of the three-phase unbalanced current is reduced.
Optionally, the phase selection execution module 3 includes a first phase selection execution unit; the first phase selection execution unit is configured to switch the temporary power supply into one phase with the minimum three-phase current in the bus according to the phase selection execution command.
Specifically, the temporary power source may include a single-phase power source that temporarily accesses a load, such as an inspection power box, a distribution box, or the like. After the phase selection execution module 3 receives the phase selection execution command generated by the central control module 2, the first phase selection execution unit accesses the temporary power supply to one phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the function of phase sequence selection is realized, and the generation of unbalanced current during the access of the temporary power supply is reduced.
Optionally, the first phase selection execution unit is configured to be manually turned on or off.
Specifically, the present embodiment is a refinement of the first phase selection performing unit in the above-described embodiments. The first phase selection execution unit can be configured in a manual starting or closing mode, and the first phase selection execution unit is started or closed manually under the condition that the temporary power supply needs to be accessed, so that the phenomenon that the first phase selection execution unit frequently starts one phase with the minimum three-phase current in the selection bus, and the phase of the temporary power supply is switched to be accessed frequently can be avoided.
Optionally, the first phase selection execution unit includes a locking unit, and the first phase selection execution unit is configured to be locked by the locking unit after executing the phase selection execution command, so as to prohibit execution of a new phase selection execution command.
Specifically, this embodiment is another refinement of the first phase selection performing unit. The first phase selection execution unit may further include a locking unit configured to be locked by the locking unit after the phase selection execution command is executed, and the state of the first phase selection execution unit is kept unchanged to prohibit the first phase selection execution unit from executing a new phase selection execution command, so that the first phase selection execution unit may avoid frequently selecting a phase with the minimum three-phase current in the bus according to the phase selection execution command, which may cause the phase of the temporary power supply to be frequently switched in.
Optionally, the phase selection execution module 3 further includes a second phase selection execution unit; and the second phase selection execution unit is configured to access the online load to be accessed to the phase with the minimum three-phase current in the bus according to the phase selection execution command.
In particular, the online load to be accessed may comprise a load to be accessed to the power system, such as a single phase power supply. After the phase selection execution module 3 receives the phase selection execution command generated by the central control module 2, the second phase selection execution unit accesses the online load to be accessed to the phase with the minimum three-phase current in the bus according to the phase selection execution command. Optionally, after the online load to be connected is connected and the three-phase load is unbalanced, after the phase selection execution module 3 receives the phase selection execution command generated by the central control module 2, the second phase selection execution unit switches the single-phase power supply of which the connected phase is not the phase with the minimum three-phase current in the bus to the phase with the minimum three-phase current in the bus according to the phase selection execution command, so that the function of balancing the unbalanced load is realized, and the generation of unbalanced current when the online load is started is reduced.
Optionally, the second phase selection execution unit is configured to automatically start according to the received phase selection execution command.
Specifically, the present embodiment is a refinement of the second phase selection performing unit described in the above embodiment. The central control module 2 compares the calculated three-phase unbalanced current with a preset three-phase unbalanced current value, and if the calculated three-phase unbalanced current exceeds the preset three-phase unbalanced current value, a phase selection execution command can be sent to the second phase selection execution unit, so that the second phase selection execution unit is automatically started and executes the phase selection execution command, thereby realizing the function of balancing unbalanced loads and reducing the generation of unbalanced current when the online loads are started. The preset three-phase unbalanced current value can be the maximum value of a three-phase current amplitude difference allowable range in the power system.
Optionally, the second phase selection execution unit is configured to access the online load to be accessed to the phase with the minimum three-phase current in the bus if the three-phase unbalanced current is greater than or equal to a preset value.
Specifically, the preset value may be set according to a specific application scenario and a requirement. The three-phase unbalanced current value can be designed in a multi-section mode, for example, when the three-phase unbalanced current is greater than or equal to a preset value, the priority strategy is that the second phase selection execution unit accesses the online load to be accessed to one phase with the minimum three-phase current in the bus; it should be noted that the first preset value is smaller than the trip current of the bus, for example, the trip current of the bus is 2A, and then the first preset value may be set to 1.5A; and after the second phase selection execution module accesses the online load to be accessed to the phase with the minimum three-phase current in the bus, the second phase selection execution module is locked and does not respond to the option execution command action any more. In addition, if the three-phase unbalanced current is smaller than the first preset value, the second phase selection execution module can be controlled to access the online load to be accessed to any one phase.
Fig. 2 is a schematic structural diagram of a phase selection execution module according to an embodiment of the present invention. Referring to fig. 2, optionally, the phase selection execution module 3 includes a contactor 31, where the contactor 31 is connected between the bus and the load, and the contactor 31 is configured to control the conducting state of the load and the power line of each phase in the bus by the central control module 2; or, the phase selection execution module 3 comprises a thyristor 32, the thyristor 32 is connected between the bus and the load, and the thyristor 32 is configured to control the conduction state of the load and each phase power line in the bus by the central control module 2.
Specifically, the contactor 31 and the thyristor 32 both function as a switch and are used for conducting one signal with another signal, wherein the contactor 31 is low in cost and simple to control, but cannot withstand an impact current generated when a capacitor is connected to a power grid, and the impact current easily causes loss to equipment such as a contactor and the capacitor; the cost of the thyristor 32 is slightly higher, but the generation of switching-on inrush current or transient overvoltage can be avoided, and the thyristor has low failure rate and long service life. The contactors 31 or thyristors 32 are connected between the bus and the load, and each corresponding contactor 31 or thyristor 32 of the three-phase power serves as a switch to control the conduction state of the load and each phase power line in the bus. For example, when the phase a of the three-phase power is the phase with the minimum current, the load needs to be connected to the phase a of the three-phase power, the contactor 31 or the thyristor 32 corresponding to the phase a of the three-phase power is closed and conducted, and the other corresponding contactors 31 or thyristors 32 are kept open.
Fig. 3 is a schematic structural diagram of another load phase selection device according to an embodiment of the present invention. Referring to fig. 3, optionally, the load phase selection device further includes: the central control module 2 is in communication connection with the phase selection execution module 3 through the communication module 4.
Specifically, the communication module 4 is configured to transmit a phase selection execution command issued by the central control module 2 to the phase selection execution module 3.
Fig. 4 is a schematic structural diagram of another load phase selection device according to an embodiment of the present invention. Referring to fig. 4, optionally, the load phase selection apparatus further includes: and the interaction module 5 is connected with the central control module 2, and the interaction module 5 is used for carrying out data interaction with the central control module 2.
Specifically, the interaction module 5 may be composed of a liquid crystal display, and is configured to perform data interaction with the central control module 2, and the interaction module 5 is mainly configured to implement a function of checking and selecting a user function, presetting parameters such as a three-phase unbalanced current value, and checking an alarm of an abnormal detection condition.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A load phase selection device, comprising:
the load detection module is used for acquiring the three-phase current of the bus in real time;
the central control module is connected with the load detection module and used for calculating three-phase unbalanced current according to the three-phase current of the bus and generating a phase selection execution command according to the three-phase unbalanced current;
and the phase selection execution module is connected with the central control module and is used for accessing the load to one phase with the minimum three-phase current in the bus according to the phase selection execution command.
2. The load phase selection device according to claim 1, wherein the phase selection execution module comprises a first phase selection execution unit;
the first phase selection execution unit is configured to switch a temporary power supply into one phase with the minimum three-phase current in the bus according to a phase selection execution command.
3. The load phase selection device according to claim 2, wherein the first phase selection execution unit is configured to be manually turned on or off.
4. The load phase selection device according to claim 2, wherein the first phase selection execution unit comprises a locking unit, and the first phase selection execution unit is configured to be locked by the locking unit after executing the phase selection execution command to prohibit execution of a new phase selection execution command.
5. The load phase selection device according to claim 1, wherein the phase selection execution module further comprises a second phase selection execution unit;
and the second phase selection execution unit is configured to access the online load to be accessed to the phase with the minimum three-phase current in the bus according to the phase selection execution command.
6. The load phase selection device according to claim 5, wherein the second phase selection execution unit is configured to be automatically activated according to the received phase selection execution command.
7. The load phase selection device according to claim 5, wherein the second phase selection execution unit is configured to switch the online load to be switched in to one phase with the minimum three-phase current in the bus if the three-phase unbalanced current is greater than or equal to a preset value.
8. The load phase selection device according to claim 1, wherein the phase selection execution module comprises a contactor, the contactor is connected between the bus and the load, and the contactor is configured to control the conducting state of the load and each phase power line in the bus by the central control module;
or, the phase selection execution module comprises a thyristor, the thyristor is connected between the bus and the load, and the thyristor is configured to control the conduction state of the load and each phase power line in the bus by the central control module.
9. The load phase selection device according to claim 1, further comprising:
and the central control module is in communication connection with the phase selection execution module through the communication module.
10. The load phase selection device according to claim 1, further comprising:
and the interaction module is connected with the central control module and is used for carrying out data interaction with the central control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210718961.0A CN115065072A (en) | 2022-06-23 | 2022-06-23 | Load phase selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210718961.0A CN115065072A (en) | 2022-06-23 | 2022-06-23 | Load phase selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115065072A true CN115065072A (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210718961.0A Pending CN115065072A (en) | 2022-06-23 | 2022-06-23 | Load phase selection device |
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| CN (1) | CN115065072A (en) |
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- 2022-06-23 CN CN202210718961.0A patent/CN115065072A/en active Pending
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