CN212063498U - Flexible alternating current active voltage adjusting device - Google Patents
Flexible alternating current active voltage adjusting device Download PDFInfo
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- CN212063498U CN212063498U CN202021062482.0U CN202021062482U CN212063498U CN 212063498 U CN212063498 U CN 212063498U CN 202021062482 U CN202021062482 U CN 202021062482U CN 212063498 U CN212063498 U CN 212063498U
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Abstract
The utility model discloses a flexible active voltage adjusting device that exchanges, the device includes main transformer and controllable voltage source, main transformer includes main transformer high-voltage winding and main transformer low voltage winding, a serial communication port, controllable voltage source establishes ties between the neutral point of the end of main transformer high-voltage winding and transformer or ground, controllable voltage source is set up to voltage amplitude and the equal nimble regulation of phase place, controllable voltage source is used for adjusting the voltage at main transformer high-voltage winding both ends, and then adjusts the voltage of low voltage winding through electromagnetic coupling. Amplitude modulation voltage regulation replaces traditional mechanical turn regulation voltage regulation, risks such as mechanical faults, insulation deterioration and arcing firing caused by frequent actions of a mechanical voltage regulation switch in the existing transformer are avoided, reliable operation of an alternating current and direct current power transmission system is guaranteed, and safety and operation flexibility of the ultrahigh voltage direct current power transmission system and the alternating current power transmission system are effectively improved.
Description
Technical Field
The utility model relates to an electric power system electrical equipment field, concretely relates to flexible interchange active voltage adjusting device.
Background
The converter transformer is the core of a high-voltage direct-current transmission system, in order to meet the voltage regulation requirement of the direct-current system, a mechanical on-load voltage regulating switch is arranged in the converter transformer, and the purpose of regulating the voltage of a valve side winding is achieved by regulating the number of turns of a high-voltage side winding of the converter transformer. In order to ensure the voltage quality of the load side, the conventional alternating current power transformer also needs to regulate voltage by load when the system voltage changes, so as to ensure the stability of the voltage of the load side. The transformer on-load voltage regulation is a necessary means for ensuring the normal operation of a direct current system and an alternating current system.
At present, the voltage regulation of a low-voltage winding is realized by mainly adopting an on-load voltage regulation switch and changing the turn number of a high-voltage winding so as to change the transformation ratio of a transformer. The on-load tap changer mainly adopts a structural form of combining a selector switch and a transfer switch and adopting double transition resistors, the mechanical structure is extremely complex, in long-term operation, the on-load tap changer needs to frequently adjust the switch gear, mechanical parts such as the selector switch and the transfer switch in the on-load tap changer frequently act, mechanical faults such as shaft shaking of an umbrella-shaped gearbox, failure of a ball clamping ring of an operation gearbox, action dislocation, cracks of a transmission shaft and the like are easily caused, the operation fault detection difficulty is high, the turn-adjusting process also has the risk of turn-to-turn short circuit of a transformer, safety accidents caused by too many direct current converter on-load tap changers exist at present, and great challenges are brought to the safe operation of a high-. In order to avoid frequent actions of the on-load voltage regulating switch and reduce safe operation risks, the extra-high voltage direct current system is forced to adopt a fixed operation mode, the operation flexibility of the direct current system is greatly reduced, and the effective exertion of the direct current transmission capacity is limited.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the present invention lies in overcoming the defects of mechanical failure, insulation deterioration, etc. caused by frequent actions of the transformer mechanical voltage regulating switch in the prior art, thereby providing a flexible ac active voltage regulating device.
Therefore, the utility model provides a flexible active voltage adjusting device that exchanges, include:
the main transformer comprises a first winding and a second winding, the first winding is electromagnetically coupled with the second winding, the head end of the first winding is used for being connected with an alternating current system bus, and the second winding is used for being connected with a load or an alternating current-direct current transmission system;
a controllable voltage source having one end connected to the end of the first winding and the other end for connection to a neutral point of the transformer or to ground, the controllable voltage source being arranged such that the amplitude or phase of the output voltage is adjustable.
A controllable voltage source is connected in series between the tail end of a main transformer winding and a neutral point or ground of the transformer, and under the condition that the turn number transformation ratio is not changed, the output voltage of the controllable voltage source is changed, namely the voltage at two ends of the first winding can be adjusted, and further the output voltage of the second winding is changed.
Further, the controllable voltage source outputs a voltage with the same working frequency as the main transformer.
Further, the phase adjustment range of the output voltage of the controllable voltage source is 0-360 degrees.
Further, the first winding is a high-voltage winding, and the second winding is a low-voltage winding.
Further, the controllable voltage source comprises:
the energy-taking transformer comprises a third winding and a fourth winding, the third winding and the fourth winding are electromagnetically coupled, and the third winding is connected with an external alternating current power supply;
and the output side of the voltage-regulating converter valve is connected between the tail end of the first winding and a neutral point or ground of the transformer in series, and the input side of the voltage-regulating converter valve is connected with the fourth winding.
The controllable voltage source may be implemented by a power electronic converter.
Furthermore, the voltage-regulating converter valve comprises a plurality of power modules, input sides of the power modules are respectively connected with the fourth winding, and output sides of the power modules are cascaded and then connected in series between the tail end of the first winding and a neutral point or ground of the transformer.
The voltage-regulating converter valve is composed of a plurality of power modules based on a full-control power electronic device, and alternating current-direct current-alternating current power conversion is achieved. The cascade connection of a plurality of power modules can be suitable for different voltage ranges, and the output voltage of the transformer winding can be adjusted when the turn ratio is not changed.
Further, the external alternating current power supply comprises a fifth winding, the fifth winding is electromagnetically coupled with the first winding, and the fifth winding is connected with the third winding.
Further, the controllable voltage source comprises a bypass switch connected in series between the first winding end and a neutral point of the transformer or ground.
The bypass switch ensures that the normal operation of the main transformer is not influenced when the controllable voltage source fails.
The utility model discloses technical scheme has following advantage:
1. the utility model discloses a controllable voltage source that amplitude and phase place can be adjusted in a flexible way is established ties between the neutral point or the ground of main transformer winding end and transformer, adjusts main transformer primary winding both ends voltage through the output voltage who adjusts controllable voltage source, and then changes the output voltage of main transformer secondary winding, adopts the amplitude modulation pressure regulating mode to replace traditional transfer circle pressure regulating, can thoroughly avoid adopting the operation risk that transfer circle pressure regulating brought;
2. the utility model has the advantages that the controllable voltage source is arranged between the end of the main transformer winding and the neutral point or the ground of the transformer, the insulation requirement on the controllable voltage source is low, the current is small, and the engineering application is convenient;
3. the controllable voltage source in the utility model can be composed of a plurality of power modules, and the cascade connection of the modules can realize the application under different voltages, thus being easy to expand;
4. the controllable voltage source in the utility model is based on power electronic devices, flexible in control, fast in response speed, unlimited in adjustment times and free of arc risk;
5. the utility model can continuously regulate the voltage under the normal operation condition, and can quickly output and compensate the voltage of the alternating current system by the controllable voltage source when the system voltage drops, thereby effectively improving the operation reliability of the alternating current and direct current system;
6. the utility model discloses can in time, effectively carry out state monitoring, can avoid the unable detection of trouble in the mechanical switch, insulating gradual degradation scheduling problem.
7. The utility model discloses a plurality of power module realizes active regulation voltage's purpose, and through control strategy adjustment voltage, a plurality of power module cascades and to be applicable to different voltage range for change transformer winding voltage, adopt among the pressure regulating converter valve based on module cascade technique, output voltage can expand in a flexible way, realizes flexible regulation voltage's purpose.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of a flexible ac active voltage regulator according to embodiment 1 of the present invention;
fig. 2 is a topological structure diagram of a specific example of the flexible ac active voltage regulator according to embodiment 2 of the present invention;
fig. 3 is a topological structure diagram of a specific example of the flexible ac active voltage regulator according to embodiment 3 of the present invention;
reference numerals:
01-an alternating current system bus, 02-a main transformer, 03-a controllable voltage source, 04-other alternating current power supplies, 21-a first winding, 22-a second winding, 23-a fifth winding, 31-a voltage regulating converter valve, 32-an energy obtaining transformer, 33-a bypass switch, 311-a power module, 321-a third winding and 322-a fourth winding.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
The present embodiment provides an ac voltage regulator, as shown in fig. 1, including: the transformer comprises a main transformer 02, wherein the main transformer 02 comprises a first winding 21 and a first winding 22, the first winding 21 is electromagnetically coupled with the first winding 22, the head end of the first winding 21 is used for being connected with an alternating current system bus 01, and the second winding 22 is used for being connected with a load or an alternating current/direct current power transmission system; a controllable voltage source 03, one end connected to the end of the first winding 21 and the other end for connection to the neutral point or ground of the main transformer 02, is arranged such that the output voltage amplitude or phase is adjustable.
In an alternative embodiment, the main transformer 02 may be selected to be a converter transformer or a power transformer.
In an alternative embodiment, the controllable voltage source 03 outputs a voltage at the same frequency as the main transformer 02.
In an alternative embodiment, the phase of the output voltage of the controllable voltage source 03 is adjusted in a range of 0-360 degrees.
In an alternative embodiment, the first winding 21 is a high voltage winding and the second winding 22 is a low voltage winding, or the first winding 21 is a low voltage winding and the second winding 22 is a high voltage winding.
An alternating current system bus 01 connected to the main transformer 02 provides power for the main transformer 02. The first winding 21 and the second winding 22 cooperate to complete the voltage conversion process, and the second winding 22 is responsible for the voltage output, when the voltage of the first winding 21 changes, the voltage of the low-voltage winding also changes.
A controllable voltage source 03 is connected in series between the end of a first winding 21 of a main transformer 02 and a neutral point (or ground), and the voltage of an alternating current system bus 01 is uSThe voltage of the first winding of the main transformer 02 is u1The output voltage of the controllable voltage source 03 is uXThe second winding has a voltage u2When the ratio of the first winding 21 to the second winding 22 of the main transformer 02 is N, the voltage of the second winding 22 is related to the output voltage of the controllable voltage source 03 as follows:
in this embodiment, the voltage across the first winding of the main transformer can be adjusted by changing the output voltage of the controllable voltage source 03 without changing the turn ratio, so as to change the output voltage of the second winding. A controllable voltage source with flexibly adjustable amplitude and phase is connected in series between the tail end of the first winding of the main transformer 02 and the central point (or the ground), and the controllable voltage source has low ground potential, low insulation requirement, small borne current and easy implementation. The output voltage of the voltage source is adjusted, the voltages at two ends of the first winding of the transformer are changed, the voltage of the second winding (the low-voltage side) of the transformer is adjusted, the traditional mechanical turn-adjusting voltage regulation is replaced by amplitude-modulating voltage regulation, frequent actions of a traditional mechanical turn-adjusting voltage regulation switch are avoided, safe operation risks are reduced, the operation flexibility of a direct-current system is improved, and the direct-current transmission capacity of the transformer is effectively improved.
Example 2
Based on embodiment 1, in the flexible ac active voltage regulator provided in this embodiment, as shown in fig. 2, the controllable voltage source 03 includes: the energy-taking transformer 32 comprises a third winding 321 and a fourth winding 322, the third winding 321 is electromagnetically coupled with the fourth winding 322, and the third winding 321 is connected with an external alternating current power supply; and the output side of the voltage-regulating converter valve 31 is connected between the tail end of the first winding 21 and the neutral point (or the ground) of the transformer in series, and the input side of the voltage-regulating converter valve is connected with the fourth winding 322.
In an optional embodiment, the voltage regulating converter valve 31 includes a plurality of power modules 311, input sides of the plurality of power modules 311 are respectively connected with the fourth winding 322, and output sides of the plurality of power modules 311 are cascaded and then connected in series between an end of the first winding 21 and a neutral point of the transformer.
The plurality of power modules 311 adopt a commutation power module to achieve the purpose of actively adjusting the voltage.
In an alternative embodiment, the output sides of the several power modules are cascaded to the required regulated voltage. The voltage is adjusted through a control strategy, the cascade connection of the power modules can be suitable for different voltage ranges and used for changing the voltage of a transformer winding, the module cascade technology is adopted in the voltage-regulating converter valve, the output voltage can be flexibly expanded, and the purpose of flexibly regulating the voltage is achieved.
In an alternative embodiment, the controllable voltage source 03 may be implemented by a power electronic converter.
In an alternative embodiment, a bypass switch 33 is further included, the bypass switch 33 being connected in series between the end of the first winding 21 and the neutral point (or ground) of the transformer.
The fourth winding 322 (low side) of the energy-scavenging transformer 32 is in the form of multiple windings, each of which provides energy to each power module. The controllable voltage source 03 can be implemented by a power electronic converter, the third winding 321 (high-voltage side) of the energy-taking transformer 32 is connected to an ac energy supply bus of another voltage class of the substation, and the fourth winding 322 (low-voltage side) is connected to the voltage-regulating converter valve 31, so as to convert the voltage of the other energy supply bus into an input voltage suitable for the voltage-regulating converter valve 31. The energy-taking transformer 32 is connected with other alternating-current power supplies 04 of the transformer substation, reduces the voltage of the other alternating-current power supplies 04 to the input voltage suitable for the voltage-regulating converter valve 31, provides active support for the voltage-regulating converter valve 31, and realizes electrical isolation between the other alternating-current power supplies 04 and the voltage-regulating converter valve 31.
The voltage-regulating converter valve 31 is composed of a plurality of power modules 311 based on a fully-controlled power electronic device, and realizes ac-dc-ac power conversion. The input side of each power module 311 is connected to the low-voltage side winding of the energy-extracting transformer 32, and the power modules 311 on the input side are independent of each other. The output side of the power module 311 is connected in series between neutral points (or ground) of a high-voltage winding of the transformer 02 after being cascaded, and the cascade connection of a plurality of modules can be suitable for different voltage ranges, so that the output voltage of a winding on the valve side can be adjusted when the turn ratio is not changed. The voltage-regulating converter valve 31 is located outside the main transformer and connected with a fourth winding 322 (low-voltage end) of the energy-taking transformer 32, the voltage can be regulated through a control strategy, the cascade connection of a plurality of modules can be suitable for different voltage ranges and used for changing the voltage of a high-voltage winding of the main transformer 02, so that the output voltage of the low-voltage winding can be regulated when the turn ratio is not changed, and the output voltage can be flexibly expanded due to the fact that a plurality of power modules 311 in the voltage-regulating converter valve 31 can adopt a module-based cascade technology.
The bypass switches 33 are connected in parallel at two ends of the output side of the active pressure regulating converter valve 31, so that the normal operation of the transformer 02 is not affected by the fault of the pressure regulating converter valve 31. When the active voltage-regulating converter valve 31 breaks down, the bypass switch 33 is closed, the main transformer 02 can continuously play a role, and the continuous operation of an alternating current and direct current system is not influenced.
Example 3
According to embodiment 2, a flexible ac active voltage regulator is provided, as shown in fig. 3, the external ac power source includes a fifth winding 23, the fifth winding 23 is electromagnetically coupled to the first winding 21, and the fifth winding 23 is connected to the third winding 321.
The fifth winding 23 is connected to the third winding 321 (input side) of the energy-taking transformer 32 for providing active support for the energy-taking transformer 32. The energy-taking transformer 32 is connected with the fifth winding 23, reduces the voltage of the fifth winding 23 to an input voltage suitable for the voltage-regulating converter valve 31, provides active support for the voltage-regulating converter valve 31, and realizes electrical isolation between the fifth winding 23 and the voltage-regulating converter valve 31.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (9)
1. A flexible ac active voltage regulator device, comprising:
the main transformer comprises a first winding and a second winding, the first winding is electromagnetically coupled with the second winding, the head end of the first winding is used for being connected with an alternating current system bus, and the second winding is used for being connected with a load or an alternating current-direct current transmission system;
a controllable voltage source having one end connected to the end of the first winding and the other end for connection to a neutral point of the transformer or to ground, the controllable voltage source being arranged such that the amplitude or phase of the output voltage is adjustable.
2. The flexible ac active voltage regulator of claim 1, wherein the controllable voltage source outputs a voltage at the same operating frequency as the main transformer.
3. The flexible ac active voltage regulator of claim 1, wherein the phase adjustment range of the controllable voltage source output voltage is 0-360 degrees.
4. The flexible ac active voltage regulator of claim 1, wherein the first winding is a high voltage winding and the second winding is a low voltage winding.
5. The flexible ac active voltage regulator of claim 1, wherein the controllable voltage source comprises:
the energy-taking transformer comprises a third winding and a fourth winding, the third winding and the fourth winding are electromagnetically coupled, and the third winding is connected with an external alternating current power supply;
and the output side of the voltage-regulating converter valve is connected in series between the tail end of the first winding and the neutral point of the transformer, and the input side of the voltage-regulating converter valve is connected with the fourth winding.
6. The flexible alternating current active voltage regulating device according to claim 5, wherein the voltage regulating converter valve comprises a plurality of power modules, input sides of the plurality of power modules are respectively connected with the fourth winding, and output sides of the plurality of power modules are cascaded and then connected in series between the tail end of the first winding and a neutral point of the transformer.
7. The flexible ac active voltage regulator of claim 6, wherein the output sides of the plurality of power modules are cascaded to achieve the desired regulated voltage.
8. The flexible ac active voltage regulator of claim 5, wherein the external ac power source comprises a fifth winding electromagnetically coupled to the first winding, the fifth winding connected to the third winding.
9. The flexible ac active voltage regulator of claim 1, wherein the controllable voltage source comprises a bypass switch connected in series between the first winding end and a neutral point of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021062482.0U CN212063498U (en) | 2020-06-10 | 2020-06-10 | Flexible alternating current active voltage adjusting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021062482.0U CN212063498U (en) | 2020-06-10 | 2020-06-10 | Flexible alternating current active voltage adjusting device |
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| CN212063498U true CN212063498U (en) | 2020-12-01 |
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| CN202021062482.0U Active CN212063498U (en) | 2020-06-10 | 2020-06-10 | Flexible alternating current active voltage adjusting device |
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