CN117335434A - On-load voltage regulation method for stock distribution transformer - Google Patents
On-load voltage regulation method for stock distribution transformer Download PDFInfo
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- CN117335434A CN117335434A CN202311179758.1A CN202311179758A CN117335434A CN 117335434 A CN117335434 A CN 117335434A CN 202311179758 A CN202311179758 A CN 202311179758A CN 117335434 A CN117335434 A CN 117335434A
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- voltage regulating
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- distribution transformer
- load voltage
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 58
- 238000004804 winding Methods 0.000 claims abstract description 32
- 230000007704 transition Effects 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007363 regulatory process Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
An on-load voltage regulating method for an inventory distribution transformer belongs to the technical field of on-load voltage regulating devices and voltage regulating methods for inventory distribution transformers, wherein the on-load voltage regulating devices of the inventory distribution transformer are three-phase voltage regulating devices, and each phase voltage regulating device comprises a shunt winding, two voltage regulating windings, two associated vacuum switches, four change-over switches, a transition resistor and a control device; the on-load voltage regulating device has simple regulating logic, fewer taps and switches, simplified number of component parts, greatly reduced volume and cost, reduced influence of switch arcing on oil due to vacuum switch and transition resistance in the voltage regulating transition process, and prolonged service life and operation and maintenance period of equipment.
Description
Technical Field
The invention belongs to the technical field of on-load voltage regulating devices and voltage regulating methods of stock distribution transformers, and particularly relates to an on-load voltage regulating method of a stock distribution transformer.
Background
The problem of low voltage exists in the power distribution network in China for a long time, and as the distributed photovoltaic is connected to the load side of the traditional low power distribution network, the power flow distribution is changed, when the capacity of the distributed photovoltaic exceeds the load, the original load side is changed into the power supply side, the power flow is inverted, the node with the original voltage reduced due to the inverted power flow is changed into the node with the voltage increased, and the phenomenon that the voltage is higher than the upper limit occurs when the connected capacity is overlarge. Among the risks faced by high-proportion distributed photovoltaic grid-connection, voltage out-of-limit is the most important factor affecting photovoltaic capacity. Currently, more than 100 tens of thousands of distribution transformers exist in a distribution network in China, most of the transformers are non-excitation voltage regulating transformers, and dynamic regulation of output voltage under the condition of load cannot be realized. In recent years, as on-load voltage regulating switch technology is mature gradually, a small amount of on-load voltage regulating distribution transformers are applied to distribution areas in a distribution network in an demonstration mode, but the distribution areas are new areas, the old stock areas still cannot realize the on-load voltage regulating function, the problem of low voltage existing for a long time cannot be solved dynamically, and a large amount of distributed photovoltaic access low-voltage areas cannot be supported.
Disclosure of Invention
The invention provides an on-load voltage regulation method for an inventory distribution transformer, which aims to solve the problem that a large number of existing transformer areas cannot realize on-load voltage regulation, ensure the voltage quality and safe operation of the output of the distribution transformer and further improve the capacity of the distributed photovoltaic of a low-voltage distribution network.
The technical scheme adopted by the invention for achieving the purpose is as follows:
an on-load voltage regulating method for an inventory distribution transformer, wherein the on-load voltage regulating device of the inventory distribution transformer is a three-phase voltage regulating device, and each phase voltage regulating device comprises a shunt winding U3, two voltage regulating windings U1 and U2, two associated vacuum switches K4a and K4b, two single-pole double-throw switches K1 and K2, two associated change-over switches K3a and K3b, a transition resistor (R) and a control device;
the rated voltage of the primary side and the secondary side of the distribution transformer is 10kV;
one end of each of the two voltage regulating windings U1 and U2 is respectively connected with a single-pole double-throw switch K1 and K2, and nodes P1, P2 and P3 are led out, and the two voltage regulating windings are connected with an input end AX through two associated switches K3a and K3b and the single-pole double-throw switches K1 and K2;
one end of the transition resistor R is connected with an input end AX of the device and a change-over switch K3a through a node P6, and the other end of the transition resistor R is connected with a vacuum switch K4 a;
the two associated vacuum switches K4a and K4b are connected in parallel, and nodes P7 and P8 are led out; the two associated change-over switches K3a and K3b are connected in parallel, and the nodes P4 and P5 are led out;
one end of the vacuum switch K4b is connected with the output end A' X of the device;
the shunt winding U3 is arranged at the output end A' X of the device.
The on-load voltage regulation method comprises the following steps: the switching of the vacuum switch and the magnetic latching relay is controlled, the switching-in mode of the voltage regulating winding is changed, the number of turns of the effective winding on the input side of the device is changed, and the transition resistor is used for limiting current in the voltage regulating transition process, so that the output voltage of the device is regulated.
Further, the number of turns of the voltage regulating windings is determined according to the voltage regulating range.
Furthermore, the on-load voltage regulating device of the stock distribution transformer is used in a mode of being connected in series to the high-voltage side of the existing transformer.
The beneficial effects of the invention are as follows: the on-load voltage regulating device has simple regulating logic, fewer taps and switches, simplifies the number of component parts, greatly reduces the volume and cost, adopts vacuum switch switching and transition resistance in the voltage regulating transition process, reduces the influence of switch arcing on oil, and improves the service life and operation and maintenance period of equipment.
Drawings
Fig. 1 is a schematic diagram of one connection principle of an on-load voltage regulator of an inventory distribution transformer according to the present invention.
Wherein U1 and U2 are independent voltage regulating windings; u3 is shunt winding; k1 K2 is a single pole double throw switch; k3a, K3b are switches; k4a, K4b are vacuum switches; r is a transition resistance; AX is the input; a' X is the output.
Description of the embodiments
The invention will now be described in detail with reference to the drawings and examples, which together with the examples serve to illustrate the invention. It will be appreciated by those skilled in the art that the following examples are not intended to limit the scope of the invention, and any equivalent changes or modifications made within the spirit of the invention should be considered as falling within the scope of the invention.
Examples
Referring to fig. 1, an on-load voltage regulation method for an inventory distribution transformer, where the on-load voltage regulation device of the inventory distribution transformer is a three-phase voltage regulation device, and each phase voltage regulation device includes a shunt winding (U3), two voltage regulation windings U1 and U2, two associated vacuum switches K4a and K4b, two single pole double throw switches K1 and K2, two associated switch switches K3a and K3b, a transition resistor (R), and a control device;
the rated voltage of the primary side and the secondary side of the distribution transformer is 10kV;
one end of each of the two voltage regulating windings U1 and U2 is respectively connected with a single-pole double-throw switch K1 and K2, nodes P1, P2 and P3 are led out, and the two voltage regulating windings are connected with an input end AX through two associated switches K3a K b and the single-pole double-throw switches K1 and K2;
one end of the transition resistor R is connected with an input end AX of the device and a change-over switch K3a through a node P6, and the other end of the transition resistor R is connected with a vacuum switch K4 a;
the two associated vacuum switches K4ak4b are connected in parallel, and nodes P7 and P8 are led out; the two associated change-over switches K3a and K3b are connected in parallel, and the nodes P4 and P5 are led out;
one end of the vacuum switch K4b is connected with the output end A' X of the device;
the shunt winding U3 is arranged at the output end A' X of the device.
AX in the figure is the input end of the device, and A' X is the output end of the device; u3 is a shunt winding, U1 and U2 are two voltage regulating windings, and the number of turns of the voltage regulating windings can be determined according to the voltage regulating range (for example, U1 = 2.5% U3 is adopted); k1 and K2 are single-pole double-throw change-over switches; k3 is two associated change-over switches, so that the two change-over switches can be switched simultaneously, and the conduction state is changed; k4 is two associated 10kV vacuum switches, so that the two vacuum switches can be switched simultaneously, and the conduction state is changed.
For convenience of explanation of the principle and process of the on-load voltage regulation method of the stock distribution transformer, nodes in the circuits P1, P2, P3, P4, P5, P6, P7 and P8 are defined, all switch states shown in fig. 1 are original states (0 states), and the switched states are switch states (1 states), for example: the state 0 of K1 is P1-P4 path, P2-P4 is broken, the state 1 of K1 is P1-P4 is broken, P2-P4 path; the 0 state of K2 is P2-P5 channel, P3-P5 is open, the 1 state of K2 is P2-P5 is open, P3-P5 channel; the 0 state of K3 is P4-P6 and P5-P7 paths, and the 1 state of K3 is P4-P6 and P5-P7 broken paths; the 0 state of K4 is P6-P8 path and P7-P8 path, and the 1 state of K4 is P6-P8 path and P7-P8 path.
The voltage regulating process of the on-load voltage regulating device of the stock distribution transformer is as follows: the K4 is restored to the 0 state bit at the beginning of each voltage regulation, namely the P6-P8 passage and the P7-P8 circuit are disconnected; and (4) restoring K4 to 1 state bit at the end of each voltage regulation, namely P6-P8 circuit breaking and P7-P8 circuit breaking. For example, the procedure for adjusting from any gear to output step-down 1 gear (step-down 2.5%) is: firstly, K4 is placed in a 0 state, then K1, K2 and K3 are placed in the 0 state, finally, K4 is restored to a 1 state bit, voltage regulation is finished, the turn ratio of the primary side and the secondary side is U1+U3/U3, and the output voltage is 2.5% lower than the voltage of the primary side. The process of adjusting from any gear to output boost 1 gear (boost 2.5%) is: firstly, K4 is placed in a 0 state, then K1 and K2 are placed in a 0 state, K3 is placed in a 1 state, finally K4 is restored to a 1 state position, voltage regulation is finished, at the moment, a voltage regulating winding is reversely connected into a primary side in series, the turn ratio of the primary side to the secondary side is (U3-U1)/U3, and the output voltage is 2.5% higher than the voltage of the primary side. Thus, all voltage regulation action logic is as follows:
the on-load voltage regulation method comprises the following steps: the switching of the vacuum switch and the magnetic latching relay is controlled, the switching-in mode of the voltage regulating winding is changed, the number of turns of the effective winding on the input side of the device is changed, and the transition resistor is used for limiting current in the voltage regulating transition process, so that the output voltage of the device is regulated.
Further, the number of turns of the voltage regulating windings U1U 2 is determined according to the voltage regulating range (for example, u1=2.5%u3 is taken).
Furthermore, the on-load voltage regulating device of the stock distribution transformer is used in a mode of being connected in series to the high-voltage side of the existing transformer.
The on-load voltage regulating device has simple regulating logic, fewer taps and switches, simplified number of component parts, greatly reduced volume and cost, reduced influence of switch arcing on oil due to vacuum switch and transition resistance in the voltage regulating transition process, and prolonged service life and operation and maintenance period of equipment.
The foregoing embodiments are only illustrative of the present invention, and the structure, size, shape, location and shape of each component may be changed, and on the basis of the technical solution of the present invention, modifications and equivalent changes to the individual components according to the principles of the present invention should not be excluded from the protection scope of the present invention.
Claims (4)
1. The on-load voltage regulation method for the stock distribution transformer is characterized in that the on-load voltage regulation device of the stock distribution transformer is a three-phase voltage regulation device, and each phase voltage regulation device comprises a shunt winding U3, two voltage regulation windings U1 and U2, two associated vacuum switches K4a and K4b, two single-pole double-throw switches K1 and K2, two associated switch switches K3a and K3b, a transition resistor R and a control device;
the rated voltage of the primary side and the secondary side of the distribution transformer is 10kV;
one end of each of the two voltage regulating windings U1 and U2 is respectively connected with a single-pole double-throw switch K1 and K2, and nodes P1, P2 and P3 are led out, and the two voltage regulating windings are connected with an input end AX through two associated switches K3a and K3b and the single-pole double-throw switches K1 and K2;
one end of the transition resistor R is connected with an input end AX of the device and a change-over switch (K3 a) through a node P6, and the other end of the transition resistor R is connected with a vacuum switch K4 a;
the two associated vacuum switches K4ak4b are connected in parallel, and nodes P7 and P8 are led out; the two associated change-over switches K3ak3b are connected in parallel, and the nodes P4 and P5 are led out;
one end of the vacuum switch K4b is connected with the output end A' X of the device;
the shunt winding U3 is arranged at the output end A' X of the device.
2. The on-load voltage regulation method comprises the following steps: the switching of the vacuum switch and the magnetic latching relay is controlled, the switching-in mode of the voltage regulating winding is changed, the number of turns of the effective winding on the input side of the device is changed, and the transition resistor is used for limiting current in the voltage regulating transition process, so that the output voltage of the device is regulated.
3. The on-load voltage regulation method of an inventory distribution transformer according to claim 1, wherein: the number of turns of the voltage regulating windings is determined according to the voltage regulating range.
4. The on-load voltage regulation method of an inventory distribution transformer according to claim 1, wherein: the on-load voltage regulating device of the stock distribution transformer is used in a mode of being connected in series to the high-voltage side of the existing transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311179758.1A CN117335434A (en) | 2023-09-13 | 2023-09-13 | On-load voltage regulation method for stock distribution transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311179758.1A CN117335434A (en) | 2023-09-13 | 2023-09-13 | On-load voltage regulation method for stock distribution transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117335434A true CN117335434A (en) | 2024-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311179758.1A Pending CN117335434A (en) | 2023-09-13 | 2023-09-13 | On-load voltage regulation method for stock distribution transformer |
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| Country | Link |
|---|---|
| CN (1) | CN117335434A (en) |
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2023
- 2023-09-13 CN CN202311179758.1A patent/CN117335434A/en active Pending
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