CN111952984A - Non-access type alternating voltage compensation circuit and system - Google Patents
Non-access type alternating voltage compensation circuit and system Download PDFInfo
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- CN111952984A CN111952984A CN202010859021.4A CN202010859021A CN111952984A CN 111952984 A CN111952984 A CN 111952984A CN 202010859021 A CN202010859021 A CN 202010859021A CN 111952984 A CN111952984 A CN 111952984A
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- 238000004804 winding Methods 0.000 claims abstract description 68
- 230000005540 biological transmission Effects 0.000 claims abstract description 63
- 238000001514 detection method Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 13
- 230000001939 inductive effect Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004590 computer program Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a non-access type alternating current voltage compensation circuit and a system. The compensation circuit comprises a rectifier, an inverter and a compensation transformer; the alternating current end of the rectifier is connected with the power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter; the alternating current end of the inverter is connected with the primary winding of the compensation transformer; and the secondary winding of the compensation transformer is connected into the power transmission line. The impedance and the inductive reactance of the power transmission line are not influenced, and the power transmission line does not need to be transformed; the voltage can be continuously and steplessly adjusted, the precision is high, and the impact on a power distribution network in the adjusting process is small; when the method is applied to a three-phase circuit, three-phase voltages can be respectively compensated.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a non-access type alternating-current voltage compensation circuit and a non-access type alternating-current voltage compensation system.
Background
For areas with dispersed power load and low load density such as rural power grids, the problem of low voltage at the tail end is still serious due to the limitation of weak power grid structure and large power supply radius of the power grid, and the low voltage phenomenon can occur at the tail end of the line of the rural and low-voltage power distribution network and in many places during the peak period of power utilization. In addition, due to the fact that the power supply radius and the line are long, the problem of low voltage at the tail end of the line is serious in the time period when the load is high.
The current distribution network low-voltage compensation device is mostly connected in series with the secondary side of the compensation transformer into the power transmission line, the primary side winding is divided into a plurality of gears, and the secondary side compensation voltage can be changed by changing the gears of the primary side winding. This topology has the following disadvantages: the secondary side of the transformer is connected into the power transmission line in series, so that the impedance of the power transmission line is increased; the voltage regulation can only be regulated in a grading way, and the regulation precision is poor; it is difficult to compensate the voltage bidirectionally; when the method is applied to a three-phase circuit and the voltage of a three-phase line is unbalanced, the three-phase voltage is difficult to compensate respectively.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a non-access ac voltage compensation circuit and system, which do not affect the impedance and inductive reactance of a power transmission line and do not need to modify the power transmission line; the voltage can be continuously and steplessly adjusted, the precision is high, and the impact on a power distribution network in the adjusting process is small; when the method is applied to a three-phase circuit, three-phase voltages can be respectively compensated.
In a first aspect, an embodiment of the present invention provides a non-access ac voltage compensation circuit, which includes a switch, a rectifier, an inverter, and a compensation transformer.
And the alternating current end of the rectifier is connected with the power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter.
And the alternating current end of the inverter is connected with the primary winding of the compensation transformer.
And the secondary winding of the compensation transformer is connected into the power transmission line.
The switch is connected between the power transmission line and the rectifier.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where an ac end of the rectifier is connected to a three-phase power transmission line.
The inverters include a first inverter DC/AC1, a second inverter DC/AC2, and a third inverter DC/AC 3.
And the direct-current end of each inverter is connected with the direct-current end of the rectifier after integration.
The compensation transformer includes a first compensation transformer Ta, a second compensation transformer Tb, and a third compensation transformer Tc.
And the alternating current end of the first inverter DC/AC1 is connected with the primary winding of the first compensation transformer Ta.
And the alternating current end of the second inverter DC/AC2 is connected with the primary winding of the second compensation transformer Tb.
The alternating current end of the third inverter DC/AC3 is connected to the primary winding of the third compensation transformer Tc.
And the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where an ac end of the rectifier is connected to a three-phase power transmission line.
The inverter adopts a three-phase inverter.
The compensation transformer includes a first compensation transformer Ta, a second compensation transformer Tb, and a third compensation transformer Tc.
And three phases of the alternating current end of the three-phase inverter are respectively connected to the primary winding of each compensation transformer.
And the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein three phases of the ac terminals of the three-phase inverter are respectively connected to the first primary winding of each of the compensation transformers.
And the second primary windings of the three compensation transformers are connected.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where after the second primary winding of the first compensation transformer Ta and the first primary winding of the second compensation transformer Tb are connected, the second primary winding of the first compensation transformer Ta and the first primary winding of the second compensation transformer Tb are connected to an ac terminal of the inverter.
And after the second primary winding of the second compensation transformer Tb is connected with the first primary winding of the third compensation transformer Tc, the second primary winding of the second compensation transformer Tb is connected with the first primary winding of the third compensation transformer Tc and then connected with the alternating current end of the inverter.
And after the first primary winding of the first compensation transformer Ta and the second primary winding of the third compensation transformer Tc are connected, the first primary winding of the first compensation transformer Ta is connected with the AC end of the inverter.
In a second aspect, an embodiment of the present invention further provides a non-access ac voltage compensation system, which includes a detection module, a control module, and the aforementioned non-access ac voltage compensation circuit.
The detection module is used for detecting the voltage of the power transmission line.
The control module is used for carrying out voltage positive compensation on the power transmission line when the voltage of the power transmission line is detected to be lower than a rated value; and when the voltage of the power transmission line is detected to be higher than the rated value, carrying out voltage negative compensation on the power transmission line.
The embodiment of the invention has the beneficial effects that:
the invention relates to an alternating voltage compensation system for a power transmission line with short-term or long-term low voltage or high voltage of power supply voltage. The impedance and the inductive reactance of the power transmission line are not influenced, and the power transmission line does not need to be transformed; the voltage can be continuously and steplessly adjusted, the precision is high, and the impact on a power distribution network in the adjusting process is small; when the method is applied to a three-phase circuit, three-phase voltages can be respectively compensated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
The non-access ac voltage compensation circuit and system of the present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a schematic structural diagram of a non-access type alternating-current voltage compensation circuit applied to a single-phase power transmission line;
FIG. 2 is a schematic diagram of a non-accessed AC voltage compensation circuit of the present invention employing a single-phase inverter;
FIG. 3 is a schematic diagram of a Y-shaped connection structure of a non-access type AC voltage compensation circuit of the present invention using a three-phase inverter;
fig. 4 is a schematic diagram of a delta connection structure of a non-access type ac voltage compensation circuit using a three-phase inverter according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, a first embodiment of the present invention provides a non-access ac voltage compensation circuit applied to a single-phase power transmission line, including a switch, a rectifier, an inverter, and a compensation transformer.
The alternating current end of the rectifier is connected with the single-phase power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter.
The inverter adopts a single-phase inverter.
And the alternating current end of the inverter is connected with the primary winding of the compensation transformer.
And the secondary winding of the compensation transformer is connected into the power transmission line.
The secondary winding of the compensation transformer can be directly penetrated through the iron core, or a single turn or a plurality of turns can be wound on the iron core.
The switch is connected between the power transmission line and the rectifier.
Referring to fig. 2, a second embodiment of the present invention provides a non-access ac voltage compensation circuit applied to a three-phase power transmission line and using a single-phase inverter, wherein the non-access ac voltage compensation circuit includes a switch, a rectifier, an inverter and a compensation transformer.
And the alternating current end of the rectifier is connected with the three-phase power transmission line.
The inverters include a first inverter DC/AC1, a second inverter DC/AC2, and a third inverter DC/AC 3.
And the direct-current end of each inverter is connected with the direct-current end of the rectifier after integration.
The compensation transformer includes a first compensation transformer Ta, a second compensation transformer Tb, and a third compensation transformer Tc.
And the alternating current end of the first inverter DC/AC1 is connected with the primary winding of the first compensation transformer Ta.
And the alternating current end of the second inverter DC/AC2 is connected with the primary winding of the second compensation transformer Tb.
The alternating current end of the third inverter DC/AC3 is connected to the primary winding of the third compensation transformer Tc.
And the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
The secondary winding of each compensation transformer may be passed directly through the core or may be wound on the core for a single or several turns.
The switch is connected between the power transmission line and the rectifier.
Referring to fig. 3, a Y-connection non-access ac voltage compensation circuit using a three-phase inverter for a three-phase power transmission line according to a third embodiment of the present invention includes a switch, a rectifier, an inverter and a compensation transformer.
And the alternating current end of the rectifier is connected with the three-phase power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter.
The inverter adopts a three-phase inverter.
The compensation transformer includes a first compensation transformer Ta, a second compensation transformer Tb, and a third compensation transformer Tc.
And three phases of the alternating-current end of the three-phase inverter are respectively connected to the first primary winding of each compensation transformer.
And the second primary windings of the three compensation transformers are connected.
And the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
The secondary winding of each compensation transformer may be passed directly through the core or may be wound on the core for a single or several turns.
The switch is connected between the power transmission line and the rectifier.
Referring to fig. 4, a fourth embodiment of the present invention provides a delta connection non-access ac voltage compensation circuit applied to a three-phase power transmission line and using a three-phase inverter, including a switch, a rectifier, an inverter and a compensation transformer.
And the alternating current end of the rectifier is connected with the three-phase power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter.
The inverter adopts a three-phase inverter.
The compensation transformer includes a first compensation transformer Ta, a second compensation transformer Tb, and a third compensation transformer Tc.
And the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
And after the second primary winding of the first compensation transformer Ta and the first primary winding of the second compensation transformer Tb are connected, the second primary winding of the first compensation transformer Ta is connected with the AC end of the three-phase inverter.
And after the second primary winding of the second compensation transformer Tb is connected with the first primary winding of the third compensation transformer Tc, the second primary winding of the second compensation transformer Tb is connected with the first primary winding of the third compensation transformer Tc and then connected with the alternating current end of the three-phase inverter.
And after the first primary winding of the first compensation transformer Ta and the second primary winding of the third compensation transformer Tc are connected, the first primary winding of the first compensation transformer Ta is connected with the AC end of the three-phase inverter.
The secondary winding of each compensation transformer may be passed directly through the core or may be wound on the core for a single or several turns.
The switch is connected between the power transmission line and the rectifier.
A fifth embodiment of the present invention provides a non-access ac voltage compensation system, which includes a detection module, a control module, and the non-access ac voltage compensation circuit.
The detection module is used for detecting the voltage of the power transmission line.
The control module is used for carrying out voltage positive compensation on the power transmission line when the voltage of the power transmission line is detected to be lower than a rated value; and when the voltage of the power transmission line is detected to be higher than the rated value, carrying out voltage negative compensation on the power transmission line.
When the primary winding of the compensation transformer is N turns, the voltage transformation ratio of the compensation transformer is N: 1. detecting that the power supply voltage of the user side of the power transmission line is UabcRated value of the user-side voltage of UN. When U is turnedabc<0.9UNWhen the system is used, the system carries out voltage positive compensation on the power transmission line; when U is turnedabc>1.1UNAnd when the system is used, the voltage negative compensation is carried out on the power transmission line. The system may automatically adjust according to the line voltage.
When the voltage of the transmission line meets the requirement, the equipment is in a hot standby state, and the inductive reactance introduced into the line by the equipment can be offset.
The embodiment of the invention aims to protect a non-access type alternating voltage compensation circuit and a system, and has the following effects:
the impedance and the inductive reactance of the power transmission line are not influenced, and the power transmission line does not need to be transformed; the voltage can be continuously and steplessly adjusted, the precision is high, and the impact on a power distribution network in the adjusting process is small; when the method is applied to a three-phase circuit, three-phase voltages can be respectively compensated.
The non-access ac voltage compensation circuit and the computer program product of the system provided in the embodiments of the present invention include a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.
Specifically, the storage medium can be a general-purpose storage medium, such as a portable magnetic disk, a hard disk, or the like, and when the computer program on the storage medium is executed, the non-access ac voltage compensation circuit and system can be executed, so that the ac voltage compensation of the distribution line having a low voltage or a high voltage of the supply voltage for a short period or a long period can be performed.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A non-access type alternating voltage compensation circuit is characterized by comprising a rectifier, an inverter and a compensation transformer;
the alternating current end of the rectifier is connected with the power transmission line, and the direct current end of the rectifier is connected with the direct current end of the inverter;
the alternating current end of the inverter is connected with the primary winding of the compensation transformer;
and the secondary winding of the compensation transformer is connected into the power transmission line.
2. The non-access AC voltage compensation circuit of claim 1,
and the secondary winding of the compensation transformer penetrates through the iron core, or is wound on the iron core by a single turn or a plurality of turns.
3. The non-access AC voltage compensation circuit of claim 2,
the alternating current end of the rectifier is connected with the three-phase power transmission line;
the inverters include a first inverter DC/AC1, a second inverter DC/AC2, and a third inverter DC/AC 3;
the direct current end of each inverter is connected with the direct current end of the rectifier after being integrated;
the compensation transformer comprises a first compensation transformer Ta, a second compensation transformer Tb and a third compensation transformer Tc;
the alternating current end of each inverter is respectively connected to the primary winding of each compensation transformer;
and the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
4. The non-access AC voltage compensation circuit of claim 2,
the alternating current end of the rectifier is connected with the three-phase power transmission line;
the inverter adopts a three-phase inverter;
the compensation transformer comprises a first compensation transformer Ta, a second compensation transformer Tb and a third compensation transformer Tc;
the three phases of the alternating current end of the three-phase inverter are respectively connected to the primary winding of each compensation transformer;
and the secondary winding of each compensation transformer is respectively connected to the three-phase power transmission line.
5. The non-access AC voltage compensation circuit of claim 4,
and the three compensation transformers are connected in a Y-shaped manner.
6. The non-access AC voltage compensation circuit of claim 5,
three phases of the alternating-current end of the three-phase inverter are respectively connected to the first primary winding of each compensation transformer;
and the second primary windings of the three compensation transformers are connected.
7. The non-access AC voltage compensation circuit of claim 4,
and the connection groups of the three compensation transformers are connected in a triangular mode.
8. The non-access AC voltage compensation circuit of claim 7,
after the second primary winding of the first compensation transformer Ta and the first primary winding of the second compensation transformer Tb are connected, the second primary winding of the first compensation transformer Ta is connected with the AC end of the inverter;
after the second primary winding of the second compensating transformer Tb is connected with the first primary winding of the third compensating transformer Tc, the second primary winding of the second compensating transformer Tb is connected with the AC end of the inverter;
and after the first primary winding of the first compensation transformer Ta and the second primary winding of the third compensation transformer Tc are connected, the first primary winding of the first compensation transformer Ta is connected with the AC end of the inverter.
9. A non-access ac voltage compensation system, comprising a detection module, a control module and the non-access ac voltage compensation circuit according to any one of claims 1 to 8;
the detection module is used for detecting the voltage of the power transmission line;
the control module is used for carrying out voltage positive compensation on the power transmission line when the voltage of the power transmission line is detected to be lower than a rated value; and when the voltage of the power transmission line is detected to be higher than the rated value, carrying out voltage negative compensation on the power transmission line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010859021.4A CN111952984A (en) | 2020-08-24 | 2020-08-24 | Non-access type alternating voltage compensation circuit and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010859021.4A CN111952984A (en) | 2020-08-24 | 2020-08-24 | Non-access type alternating voltage compensation circuit and system |
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| CN111952984A true CN111952984A (en) | 2020-11-17 |
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| EP1078435A1 (en) * | 1998-05-21 | 2001-02-28 | Siemens Westinghouse Power Corporation | Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
| CN201178308Y (en) * | 2008-04-25 | 2009-01-07 | 华北电力大学 | Voltage disturbing compensating apparatus |
| EP2113140A4 (en) * | 2007-02-20 | 2010-04-14 | Abb Ltd | Flux control system for active voltage conditioning |
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2020
- 2020-08-24 CN CN202010859021.4A patent/CN111952984A/en active Pending
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| EP1078435A1 (en) * | 1998-05-21 | 2001-02-28 | Siemens Westinghouse Power Corporation | Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
| EP2113140A4 (en) * | 2007-02-20 | 2010-04-14 | Abb Ltd | Flux control system for active voltage conditioning |
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