CN111969611A - Transformer on-load automatic voltage regulation driving and controlling system - Google Patents
Transformer on-load automatic voltage regulation driving and controlling system Download PDFInfo
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- CN111969611A CN111969611A CN202010787147.5A CN202010787147A CN111969611A CN 111969611 A CN111969611 A CN 111969611A CN 202010787147 A CN202010787147 A CN 202010787147A CN 111969611 A CN111969611 A CN 111969611A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
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Abstract
The invention discloses a driving and controlling system for automatic voltage regulation of a transformer with load, and relates to the field of voltage regulation control of transformers. In the invention: the low-voltage side of the alternating current mutual inductance voltage reduction winding is connected with a pulse width modulation unit; a loop where the pulse width modulation unit is arranged is provided with a switch circuit; the PLC transmits an output signal of the comparison signal output module to the switch circuit through an IO output end of the PLC; under the conducting state of the switching circuit, the pulse width modulation unit transmits an alternating current pulse signal to the loop conducting control unit; and the loop conduction control unit performs switching action on a user low-voltage side coil winding loop on the transformer when the three-phase signal sent by the pulse width modulation unit crosses the zero point. According to the invention, the alternating-current low-voltage signal after voltage reduction is acquired in a PWM mode, and the signal of the switching circuit is driven and conducted through the PLC, so that the PWM transmits a bipolar modulation S-shaped signal to the loop conduction control unit circuit, and accurate switching of the winding loop is realized.
Description
Technical Field
The invention belongs to the technical field of voltage regulation control of transformers, and particularly relates to an on-load automatic voltage regulation driving and controlling system of a transformer.
Background
With the increase of industrial power consumption in China, the condition of a terminal power supply line is increasingly complex, the voltage of a distribution transformer fluctuates along with the change of power supply load, and when the load on a user side is more and the power is increased, the voltage grade on the user side is pulled down; conversely, when the load on the user side is small and the power is reduced, the voltage of the power supply line is further increased. Such too low or too high user side voltage undoubtedly has a large circuit problem, which not only affects the use of the user's electric appliance and the service life of the electric appliance itself, but also increases the loss and fluctuation on the line.
Although such fluctuations in the mains voltage are improved to some extent if the voltage regulation is performed by a distribution transformer on the mains side, it is difficult to take into account the actual operating requirements of most users because the electrical loads are distributed at different locations of the supply line.
The adoption of the low-voltage side for pressure regulation is a better mode. However, in the actual low-voltage side voltage regulation process, the collection and comparison of the alternating current signals have large oscillation, and if a single chip microcomputer or a PLC controller is adopted to control the output, the dynamic property of the alternating current output control obviously has no direct current signal, digital signal or level signal, and is simple and accurate. How to finish signal analysis, control and finishing the voltage regulation operation of a low-voltage side winding of a user in a high-efficiency and accurate manner and with small concussion is the problem to be solved.
Disclosure of Invention
The invention aims to provide an on-load automatic voltage regulation driving and controlling system for a transformer, which can carry out automatic switching operation on winding loops of voltages of different grades at a low-voltage side of a user, so that the final voltage obtained by a load at the user side reaches a more standard 220V voltage value.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a transformer on-load automatic voltage regulation driving and controlling system, which comprises at least three switching loops with corresponding winding numbers arranged on the low-voltage side of a transformer, and comprises a three-phase voltage mutual inductance assembly arranged on the low-voltage side of a user and used for acquiring voltage data signals on the low-voltage side, wherein the three-phase voltage mutual inductance assembly is connected with the input end of a PLC (programmable logic controller) through a signal line.
A voltage signal processing unit is arranged in the PLC; the voltage signal processing unit comprises a voltage signal receiving module, the voltage signal receiving module receives alternating current voltage signals transmitted by the three-phase voltage mutual inductance assembly, and the alternating current voltage signals are converted into direct current voltage signals through the AC/DC module; the voltage signal processing unit comprises a voltage signal comparison module and a comparison signal output module, the direct current voltage signal is transmitted to the voltage signal comparison module, the voltage signal comparison module transmits a compared signal to the comparison signal output module, and the comparison signal output module outputs an output signal matched with a voltage comparison result.
The three-phase voltage mutual inductance assembly at the low-voltage side of a user is connected with a secondary mutual inductance loop, an alternating current mutual inductance step-down winding is arranged in the secondary mutual inductance loop, and the low-voltage side of the alternating current mutual inductance step-down winding is connected with a pulse width modulation unit; a loop where the pulse width modulation unit is arranged is provided with a switch circuit; the PLC transmits an output signal of the comparison signal output module to the switch circuit through an IO output end of the PLC; under the conducting state of the switching circuit, the pulse width modulation unit transmits an alternating current pulse signal to the loop conducting control unit; and the loop conduction control unit performs switching action on a user low-voltage side coil winding loop on the transformer when the three-phase signal sent by the pulse width modulation unit crosses the zero point.
As a preferred technical solution of the present invention, the voltage signal comparison module includes a voltage threshold presetting module. The standard voltage value is set to be 220V, the upper threshold value of the standard range is (220+ n) V, and the lower threshold value of the standard range is (220-n) V, wherein n is greater than 0 or n is greater than or equal to 10. The three switching loops of the corresponding winding number of the low-voltage side of the transformer are respectively set as a high-voltage I group, a standard-voltage II group and a low-voltage III group.
Setting the acquired real-time voltage value of the user load side as U; when U is greater than 220+ n, judging that a high-voltage I group access signal is needed; when U is less than 220-n, judging that a low-voltage III group access signal is needed; and when U belongs to [220-n, 220+ n ], judging that the II group access signal needs to be marked.
As a preferred technical scheme of the invention, a MOC3061 silicon controlled rectifier output photoelectric coupler is arranged in the loop conduction control unit; one side of the thyristor output photoelectric coupler is connected with the pulse width modulation unit through an NPN type triode; the thyristor output photoelectric coupler is connected with a 12V direct-current voltage line which passes through the voltage reduction module and the AC/DC conversion module; a bidirectional thyristor is arranged in an output side loop of the thyristor output photoelectric coupler; the three switching loops with corresponding winding numbers arranged on the low-voltage side of the transformer are independently connected with the corresponding bidirectional controllable silicon in series.
As a preferred technical scheme of the invention, three switching circuits with corresponding winding numbers arranged at the low-voltage side of the transformer are connected in parallel at one side of a user load circuit; and the three switching loops of the corresponding winding number arranged on the low-voltage side of the transformer are independently connected with RC grounding loops.
As a preferred technical scheme of the invention, a switching circuit connected in series with a pulse width modulation unit adopts a triode conduction module and a signal amplification module; the pulse width modulation unit adopts a bipolar PWM control mode; at least three pulse width modulation units are arranged and are respectively and correspondingly connected with the secondary mutual inductance loop; the three pulse width modulation units are correspondingly connected with three signal lines output by the PLC.
The invention has the following beneficial effects:
1. the invention adopts the voltage transformer to monitor the voltage of the user side in real time, and performs automatic switching operation on winding loops of the voltages of different grades of the user low-voltage side by setting the automatic range of the winding of the transformer low-voltage side, so that the final voltage obtained by the load of the user side reaches a more standard 220V voltage value;
2. according to the invention, the voltage signal processing unit of the PLC is used for processing and analyzing the voltage collected by the voltage transformer on the line at the user side, after the direct-current processing is carried out, the voltage comparison is accurately finished without vibration, and simple digital signals and level signals are output;
3. according to the invention, the voltage transformer on the line at the user side is subjected to voltage reduction mutual inductance again, the AC low-voltage signal after voltage reduction is collected in a PWM mode, and the signal of the switching circuit is driven to be conducted through the PLC, so that the PWM transmits a bipolar modulation signal to the circuit conduction control unit circuit, and accurate switching of the winding circuit is realized.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings 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 that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a logic diagram of the on-load automatic voltage regulation driving and controlling system of the transformer in the invention;
FIG. 2 is a schematic diagram of the connection relationship between the PWM and the circuit of the loop conduction control unit according to the present invention;
fig. 3 is a schematic diagram of three switching circuits with corresponding winding numbers on the low-voltage side of the transformer in the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
Example one
In the invention, the low-voltage side of the transformer is provided with three switching loops with corresponding winding numbers, and the winding number in each switching loop is increased in sequence.
The three-phase voltage mutual inductance assembly arranged on the low-voltage side of a user is used for carrying out data acquisition on the voltage on a load circuit on the low-voltage side and then transmitting the acquired voltage data to the PLC for analysis processing.
A voltage signal processing unit is arranged in the PLC, the voltage signal processing unit comprises a voltage signal receiving module, the voltage signal receiving module receives alternating current voltage signals transmitted by the three-phase voltage mutual inductance assembly, and the alternating current voltage signals are converted into direct current voltage signals through an AC/DC module.
The voltage signal processing unit comprises a voltage signal comparison module and a comparison signal output module, and the voltage signal comparison module comprises a voltage threshold presetting module.
The direct current voltage signal converted by the AC/DC module is transmitted to the voltage signal comparison module, the voltage signal comparison module transmits the compared signal to the comparison signal output module, and the comparison signal output module outputs an output signal matched with the voltage comparison result.
Example two
The three-phase voltage mutual inductance assembly on the low-voltage side of a user is connected with a secondary mutual inductance loop, an alternating current mutual inductance step-down winding is arranged in the secondary mutual inductance loop, and the low-voltage side of the alternating current mutual inductance step-down winding is connected with a pulse width modulation unit.
A switching circuit is arranged in series in a loop where the pulse width modulation unit is located, the switching circuit adopts a triode conduction module and a signal amplification module, and is conducted after receiving a corresponding signal sent by the PLC controller, and the pulse width modulation unit transmits a modulation pulse signal to the loop conduction control unit;
when a signal sent by the pulse width modulation unit crosses a zero point (or a rising edge or a falling edge), the loop conduction control unit performs switching action on a winding loop of a low-voltage side coil of a user on the transformer, conducts the winding loop meeting the voltage requirement, and disconnects the winding loop not meeting the voltage requirement, and the specific parameter setting and winding circuit switching mode is as follows:
setting a standard voltage value as 220V, an upper threshold of a standard range as (220+ n) V, and a lower threshold of the standard range as (220-n) V, wherein n is greater than 0 or n is greater than or equal to 10;
setting three switching loops of corresponding winding numbers of three paths on the low-voltage side of the transformer as a high-voltage I group, a standard-voltage II group and a low-voltage III group respectively:
setting the acquired real-time voltage value of the user load side as U;
when U is greater than 220+ n, judging that a high-voltage I group access signal is needed;
when U is less than 220-n, judging that a low-voltage III group access signal is needed;
and when U belongs to [220-n, 220+ n ], judging that the II group access signal needs to be marked.
EXAMPLE III
A MOC3061 silicon controlled rectifier output photoelectric coupler is arranged in the loop conduction control unit;
the MOC3061 series of phototriac drivers are new optoelectronic devices recently introduced by motorola, usa. The series of devices have the characteristics that the static dv/dt capacity is greatly enhanced, and the stable switching performance of the inductive load is ensured.
6 pins in MOC3061 series products are output ends: the output stage is a light-operated bidirectional controllable silicon with zero-crossing detection, and the MOC3061 controllable silicon is used for outputting a photoelectric coupler in a mode of zero-crossing detection and signal output to carry out switching of a corresponding winding loop.
One side of the thyristor output photoelectric coupler is connected with the pulse width modulation unit through a switching circuit with a built-in NPN type triode; the thyristor output photoelectric coupler is connected with a 12V direct-current voltage line which passes through the voltage reduction module and the AC/DC conversion module; a bidirectional thyristor is arranged in an output side loop of the thyristor output photoelectric coupler; the three switching loops with corresponding winding numbers arranged on the low-voltage side of the transformer are independently connected with the corresponding bidirectional controllable silicon in series.
Three switching circuits with corresponding winding numbers, which are arranged on the low-voltage side of the transformer, are connected in parallel to one side of a user load circuit; and the three switching loops of the corresponding winding number arranged on the low-voltage side of the transformer are independently connected with RC grounding loops for absorbing slight circuit oscillation generated by switching.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The utility model provides a transformer area carries automatic voltage regulation drive and control system, includes the switching return circuit of the corresponding winding number of at least three routes that transformer low pressure side set up, includes installs the mutual subassembly of three-phase voltage at user low pressure side, gathers low pressure side voltage data signal, and the mutual subassembly of three-phase voltage passes through signal line and is connected its characterized in that with the input of PLC controller:
a voltage signal processing unit is arranged in the PLC;
the voltage signal processing unit comprises a voltage signal receiving module, the voltage signal receiving module receives alternating current voltage signals transmitted by the three-phase voltage mutual inductance assembly, and the alternating current voltage signals are converted into direct current voltage signals through the AC/DC module;
the voltage signal processing unit comprises a voltage signal comparison module and a comparison signal output module, the direct current voltage signal is transmitted to the voltage signal comparison module, the voltage signal comparison module transmits a compared signal to the comparison signal output module, and the comparison signal output module outputs an output signal matched with a voltage comparison result;
the three-phase voltage mutual inductance assembly at the low-voltage side of a user is connected with a secondary mutual inductance loop, an alternating current mutual inductance step-down winding is arranged in the secondary mutual inductance loop, and the low-voltage side of the alternating current mutual inductance step-down winding is connected with a pulse width modulation unit;
a loop where the pulse width modulation unit is arranged is provided with a switch circuit;
the PLC transmits an output signal of the comparison signal output module to the switch circuit through an IO output end of the PLC;
under the conducting state of the switching circuit, the pulse width modulation unit transmits an alternating current pulse signal to the loop conducting control unit;
and the loop conduction control unit performs switching action on a user low-voltage side coil winding loop on the transformer when the three-phase signal sent by the pulse width modulation unit crosses the zero point.
2. The transformer on-load automatic voltage regulation driving and controlling system according to claim 1, characterized in that:
the voltage signal comparison module comprises a voltage threshold preset module;
setting a standard voltage value as 220V, an upper threshold of a standard range as (220+ n) V, and a lower threshold of the standard range as (220-n) V, wherein n is greater than 0 or n is greater than or equal to 10;
setting three switching loops of corresponding winding numbers of three paths on the low-voltage side of the transformer as a high-voltage I group, a standard-voltage II group and a low-voltage III group respectively;
setting the acquired real-time voltage value of the user load side as U;
when U is greater than 220+ n, judging that a high-voltage I group access signal is needed;
when U is less than 220-n, judging that a low-voltage III group access signal is needed;
and when U belongs to [220-n, 220+ n ], judging that the II group access signal needs to be marked.
3. The transformer on-load automatic voltage regulation driving and controlling system according to claim 1, characterized in that:
a MOC3061 silicon controlled rectifier output photoelectric coupler is arranged in the loop conduction control unit;
one side of the thyristor output photoelectric coupler is connected with the pulse width modulation unit through an NPN type triode;
the thyristor output photoelectric coupler is connected with a 12V direct-current voltage line which passes through the voltage reduction module and the AC/DC conversion module;
a bidirectional thyristor is arranged in an output side loop of the thyristor output photoelectric coupler;
the three switching loops with corresponding winding numbers arranged on the low-voltage side of the transformer are independently connected with the corresponding bidirectional controllable silicon in series.
4. The transformer on-load automatic voltage regulation driving and controlling system according to claim 1, characterized in that:
three switching circuits with corresponding winding numbers, which are arranged on the low-voltage side of the transformer, are connected in parallel to one side of a user load circuit;
and the three switching loops of the corresponding winding number arranged on the low-voltage side of the transformer are independently connected with RC grounding loops.
5. The transformer on-load automatic voltage regulation driving and controlling system according to claim 1, characterized in that:
the switching circuit connected in series with the pulse width modulation unit adopts a triode conducting module and a signal amplifying module;
the pulse width modulation unit adopts a bipolar PWM control mode;
at least three pulse width modulation units are arranged and are respectively and correspondingly connected with the secondary mutual inductance loop;
the three pulse width modulation units are correspondingly connected with three signal lines output by the PLC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010787147.5A CN111969611A (en) | 2020-08-07 | 2020-08-07 | Transformer on-load automatic voltage regulation driving and controlling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010787147.5A CN111969611A (en) | 2020-08-07 | 2020-08-07 | Transformer on-load automatic voltage regulation driving and controlling system |
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| Publication Number | Publication Date |
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| CN111969611A true CN111969611A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010787147.5A Withdrawn CN111969611A (en) | 2020-08-07 | 2020-08-07 | Transformer on-load automatic voltage regulation driving and controlling system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104362921A (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | Control circuit of on-load tap changing transformer |
| CN106100356A (en) * | 2016-08-18 | 2016-11-09 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer on-load voltage regulation system based on reverse parallel connection IGCT |
| US20170235323A1 (en) * | 2012-10-16 | 2017-08-17 | Varentec, Inc. | Methods and systems of network voltage regulating transformers |
| CN107134348A (en) * | 2017-05-25 | 2017-09-05 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer voltage-regulating system |
| CN207833270U (en) * | 2017-12-21 | 2018-09-07 | 意鲁斯电气（北京）有限公司 | A kind of thyristor automatic Regulation tap switch |
-
2020
- 2020-08-07 CN CN202010787147.5A patent/CN111969611A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170235323A1 (en) * | 2012-10-16 | 2017-08-17 | Varentec, Inc. | Methods and systems of network voltage regulating transformers |
| CN104362921A (en) * | 2014-11-20 | 2015-02-18 | 国家电网公司 | Control circuit of on-load tap changing transformer |
| CN106100356A (en) * | 2016-08-18 | 2016-11-09 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer on-load voltage regulation system based on reverse parallel connection IGCT |
| CN107134348A (en) * | 2017-05-25 | 2017-09-05 | 国网江苏省电力公司南京供电公司 | A kind of distribution transformer voltage-regulating system |
| CN207833270U (en) * | 2017-12-21 | 2018-09-07 | 意鲁斯电气（北京）有限公司 | A kind of thyristor automatic Regulation tap switch |
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Application publication date: 20201120 |
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