CN117013851A - High-voltage alternating current line voltage stabilizing system - Google Patents
High-voltage alternating current line voltage stabilizing system Download PDFInfo
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- CN117013851A CN117013851A CN202310843849.4A CN202310843849A CN117013851A CN 117013851 A CN117013851 A CN 117013851A CN 202310843849 A CN202310843849 A CN 202310843849A CN 117013851 A CN117013851 A CN 117013851A
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- 230000000087 stabilizing effect Effects 0.000 title abstract description 13
- 238000004804 winding Methods 0.000 claims description 28
- 230000009466 transformation Effects 0.000 claims description 26
- 230000002457 bidirectional effect Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 101100371160 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) TSL1 gene Proteins 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- 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
- H02M5/14—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 between circuits of different phase number
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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
-
- 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 application relates to a voltage stabilizing device for a power supply line voltage. Many power supply line voltages are lower than the allowable range, meanwhile, voltage fluctuation is large, overload phenomenon frequently occurs in a power grid, line loss is obviously increased, power supply qualification rate is low, and great harm is caused to electrical equipment, and even many electrical equipment cannot be used. The high-voltage alternating current line voltage stabilizing system is high in line voltage, capable of effectively stabilizing power supply voltage of a power grid, high in response speed, low in cost, high in reliability, convenient to maintain and capable of effectively improving actual transmission capacity of a power distribution network.
Description
Technical Field
The embodiment of the application relates to the technical field of circuits, in particular to a voltage stabilizing circuit system for stabilizing power supply voltage of a power grid.
Background
With the improvement of the living standard of people and the popularization of household appliances, the power consumption of residential users is greatly increased year by year, however, the update and transformation speed of distribution lines of factories and mining units, residential communities, shops and the like is relatively delayed, so that the voltage at the tail end of the line is far lower than the allowable range, meanwhile, the voltage fluctuation is large, the overload phenomenon frequently occurs in a power grid, the non-lighting loads such as a washing machine, an air conditioner, a television and the like are difficult to normally work, and the damage to electrical equipment is huge. Meanwhile, as the newly added electric load adopts a large amount of rotating equipment such as a motor, a compressor and the like and power electronic devices, the reactive power demand is very large, and a large amount of higher harmonic current is generated, the loss of a low-voltage line is obviously increased, the power factor of the whole power grid is low, and the fluctuation of the power supply voltage is very large.
The best solution to solve the problems of low voltage and large voltage fluctuation is to directly install a power supply voltage stabilizing device on a power distribution network. The automatic voltage regulating device is additionally arranged on the power grid line, so that the power supply voltage can be automatically regulated in real time to be stabilized at a standard value, reactive power can be directly provided for electric equipment, and the actual transmission capacity of the power distribution network is improved; the operation safety of the power supply transformer is improved; the abnormal conditions such as voltage flicker and the like caused by lightning strike, instantaneous short circuit, overload and the like of the high-voltage line are greatly improved, and the safety of electric equipment is protected.
Chinese patent CN204360256U discloses a contactless ac voltage stabilizer which uses a multi-winding transformer and a multi-channel thyristor switch to realize a voltage stabilizing function. The technology is of step voltage regulation, meanwhile, in order to realize the step difference not to be too large, a plurality of paths of thyristor switching switches are needed, the circuit is complex, the cost is high, meanwhile, the switching speed of the thyristor switching switches is low, the maximum speed is only 10mS, and the technology cannot be used for rapid voltage fluctuation of a power grid. Especially, when the regulated output voltage is at a high level, if the power grid voltage is rapidly increased, the output voltage can generate overvoltage due to low response speed, so that the safety of electric equipment is endangered.
The voltage stabilizing system of the high-voltage circuit is limited by the voltage-resistant grade and the manufacturing cost of the power semiconductor device, and a technical scheme with higher cost does not exist, but the conventional on-load voltage regulating transformer cannot be continuously regulated, and the response speed is too slow to cope with the rapid fluctuation of the circuit voltage.
Disclosure of Invention
The application aims to design a high-voltage alternating current line voltage stabilizing system, which effectively realizes stable adjustment of power supply voltage of a power grid with higher grade by using a power semiconductor technology with lower voltage grade.
The application relates to a high-voltage alternating current line voltage stabilizing system, which comprises a single-phase or multi-phase transformer, wherein a primary winding of the transformer is connected with an alternating current power supply input, and each secondary winding of the transformer comprises two leading-out ends; the transformer secondary winding transformer comprises a transformer secondary winding, and is characterized by further comprising one or more current transformation modules, wherein each current transformation module comprises two input ports and one output port, the two input ports of the current transformation modules are respectively connected with the leading-out end of the transformer secondary winding, the output port of the current transformation module is used as the output end of the transformer secondary winding, the current transformation modules realize real-time regulation of voltage, can stabilize output voltage and simultaneously has a dynamic reactive compensation function; the phase-change module comprises an input port and one or two output ports, the input port of the phase-change module is connected with a primary winding of the transformer, one or two output ports of the phase-change module are connected with a secondary winding of the transformer, and the phase-change module can switch the polarity of the transformer winding and is used for improving or reducing output voltage.
In some embodiments of the disclosure, the transformer further comprises one or more bypass modules, wherein the bypass module comprises an input port and an output port, the input port of the bypass module is connected with the primary winding of the transformer, the output port of the bypass module is connected with the output port of the converter module, and when the converter module, the converter module or the transformer has a fault or abnormality, the bypass module can cut off the fault and directly communicate the input voltage to the output end.
In some embodiments of the present disclosure, the primary windings of the transformers are star coupled.
In some embodiments of the disclosure, the converter module includes a two-phase inverter bridge circuit, which is formed by a two-level inverter circuit or a neutral point clamped three-level inverter circuit, wherein a midpoint of one bridge arm of the two-phase inverter bridge circuit is used as an input port of the converter module; the two groups of capacitors are connected in series, one end of each capacitor is connected with the positive electrode of the bridge circuit of the two-phase inverter, the other end of each capacitor is connected with the negative electrode of the bridge circuit of the two-phase inverter, and the midpoints of the two groups of capacitors connected in series are used as the other input port of the converter module; the converter further comprises a filter, one end of the filter is connected with the middle point of one bridge arm in the bridge circuit of the two-phase inverter, the other end of the filter is used as an output port of the converter module, and the filter is used for filtering out output current and voltage harmonic waves of the converter module.
In some embodiments of the present disclosure, a commutation module includes two switches coupled in series, wherein a point is an input port of the commutation module and the other two ends are two output ports of the commutation module; the switch is composed of a mechanical switch or a bidirectional thyristor, and the bidirectional thyristor is composed of a forward thyristor and a reverse thyristor which are connected in parallel; the switch can also be formed by connecting a mechanical switch and a bidirectional thyristor in parallel and is connected into a compound switch; the switch can also be composed of two IGBTs connected in reverse series; through the switching of the two switches, the connection polarity of the secondary winding of the transformer can be changed, and the output voltage of the system can be increased or decreased.
In some embodiments of the present disclosure, the commutation module includes a jumper wire, one end of the jumper wire being used as an input port of the commutation module, and the other end of the jumper wire being used as an output port of the commutation module, where voltage boosting or lowering by switching windings is not required, the jumper wire being used to reduce system cost.
In some embodiments of the present disclosure, the bypass module is formed by a switch, the switch is formed by a mechanical switch or a triac, and the triac is formed by connecting two thyristors in parallel; the switch can also be formed by connecting a mechanical switch and a bidirectional thyristor in parallel, and is connected into a compound switch.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following brief description of the drawings of the embodiments will be given, it being understood that the drawings described below relate only to some embodiments of the disclosure of the present disclosure and not to limitations of the disclosure of the present disclosure, wherein:
fig. 1 is an electrical block diagram of a high voltage ac line voltage regulation system in accordance with an embodiment of the present disclosure.
Figure 2 is an exemplary circuit diagram of a current transformation module according to an embodiment of the present disclosure.
FIG. 3 is an exemplary circuit diagram of a bypass module according to an embodiment of the present disclosure.
Fig. 4 is an exemplary circuit diagram of a commutation module according to an embodiment of the disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the described embodiments of the present disclosure without the need for inventive faculty, are also within the scope of the present disclosure.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the presently disclosed subject matter belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. As used herein, a statement that two or more parts are "connected" or "coupled" together shall mean that the parts are joined together either directly or joined through one or more intermediate parts.
Fig. 1 is an electrical block diagram of a three-phase high voltage ac line voltage regulation system according to an embodiment of the present disclosure. The three-phase power inputs (A1, B1, C1) are coupled to primary windings of a three-phase transformer (1), two outlets of each secondary winding of the transformer (1) are respectively coupled to two input ports of the current transformation modules (3) M1, M2, M3, and output ports of the current transformation modules (3) are used as output ports (A3, B3, C3) of the application. The current transformation module (3) realizes real-time regulation of voltage, can stabilize output voltage, and has a dynamic reactive compensation function.
The input ports of the three phase-change modules (4) TSL1, TSL2 and TSL3 of FIG. 1 are respectively coupled with the input end of a three-phase power supply, and the two output ports of each phase-change module (4) are respectively coupled with the secondary winding of the transformer (1), so that the phase-change module (4) can switch the polarity of the transformer winding, and the output voltage is increased or reduced.
The three input ends of the bypass module (2) MP1, MP2 and MP3 of FIG. 1 are respectively coupled with the three-phase power input, and the output ends of the bypass module (2) are respectively coupled with the output ports of the current transformation module (3). The bypass module (2) is used for realizing a fault or maintenance protection function, namely when the commutation module (4), the converter module (3) or the transformer (1) is in fault or abnormal, the bypass module (2) is closed, and then the three-phase power supply is directly connected to the output end, so that the fault can be removed.
Figure 2 is an exemplary circuit diagram of a current transformation module according to an embodiment of the present disclosure. For simplicity, the example of the current transformation module in fig. 2 uses a two-phase, two-level inverter bridge circuit, and the current transformation module may also be formed by a neutral point clamped three-level inverter circuit or an inverter circuit with other topologies. In fig. 2, two parallel bridge arms (5) are included, and two series-connected capacitor banks (6) are included, which are connected in parallel across the bridge arms (5). The midpoint of one bridge arm of the two-phase inverter bridge circuit is used as one input port of the current transformation module, the midpoint of the other bridge arm is connected with an inductor, the other end of the inductor is used as the output port of the current transformation module, and the midpoint of the capacitor is used as the other input port of the current transformation module.
The inductor in fig. 2 implements a filter function for filtering output current and voltage harmonics of the current transformation module, and the filter has various circuit implementations, including LC circuits, LCL circuits, etc., which are well known to those skilled in the art, and are also within the scope of the disclosure and protection of the present application.
FIG. 3 is an exemplary circuit diagram of a bypass module according to an embodiment of the present disclosure. The bypass module comprises a group of thyristors which are connected in positive and negative directions in parallel, and the thyristors which are connected in positive and negative directions form a bidirectional switch, when trigger current is applied to the gate electrode of the thyristors, the thyristors are conducted, and when trigger current is not applied to the gate electrode of the thyristors, the thyristors are turned off, so that the functions of conducting and turning off the circuit can be realized.
The bypass module can also be composed of a mechanical switch, the on and off functions of the circuit can be realized, and the mechanical switch is connected with the thyristor switch in parallel, so that the bypass function can also be realized.
Fig. 4 is an exemplary circuit diagram of a commutation module according to an embodiment of the disclosure. Fig. 4 includes two series-connected thyristors in positive and negative parallel connection, wherein a point is used as an input port of the phase-change module, and the other two ends are used as two output ports of the phase-change module, and the thyristors in positive and negative parallel connection in fig. 4 can also be composed of a mechanical switch or two IGBTs in reverse series connection. The switch can also be formed by connecting a mechanical switch and a bidirectional thyristor in parallel, and is connected into a compound switch. By controlling the switching state of the two switches, the input end of the phase-change module can be communicated to one of the two output ends, and simultaneously, by controlling, the two switches are ensured to be in an on state at the same time, and only one of the two switches is in an on state.
The phase-change module can also be realized by a bridging wire, one end of the bridging wire is used as an input port of the phase-change module, and the other end of the bridging wire is used as one of two output ports of the phase-change module according to the output voltage requirement.
In summary, according to the high-voltage ac line voltage stabilizing system disclosed by the embodiment of the application, implementation and adjustment of line voltage can be realized efficiently and economically, and output voltage can be stabilized.
As used herein and in the appended claims, the singular forms of words include the plural and vice versa, unless the context clearly dictates otherwise. Thus, when referring to the singular, the plural of the corresponding term is generally included. Similarly, the terms "comprising" and "including" are to be construed as being inclusive rather than exclusive. Likewise, the terms "comprising" and "or" should be interpreted as inclusive, unless such an interpretation is expressly prohibited herein. The term "exemplary" is used herein, particularly when it follows a set of terms, which are merely exemplary and illustrative and should not be considered exclusive or broad.
Further aspects and scope of applicability will become apparent from the description provided herein. It is to be understood that various aspects of the application may be implemented alone or in combination with one or more other aspects. It should also be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
While several embodiments of the present disclosure have been described in detail, it will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present disclosure without departing from the spirit and scope of the disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (7)
1. A high voltage ac line voltage regulation system, comprising:
a single-phase or multi-phase transformer, the primary winding of the transformer being coupled to an ac power input, each secondary winding of the transformer comprising two terminals;
the transformer comprises one or more current transformation modules, wherein each current transformation module comprises two input ports and one output port, the two input ports of the current transformation modules are respectively connected with the leading-out ends of the secondary winding of the transformer, the output ports of the current transformation modules are used as the output ends of the transformer, the current transformation modules realize real-time regulation of voltage, can stabilize output voltage and have the function of dynamic reactive compensation;
the phase change module comprises an input port and one or two output ports, the input port of the phase change module is connected with a primary winding of the transformer, one or two output ports of the phase change module are connected with a secondary winding of the transformer, and the phase change module can switch the polarity of the transformer winding and is used for improving or reducing output voltage.
2. The high voltage ac line voltage regulation system of claim 1, further comprising one or more bypass modules, the bypass modules comprising an input port and an output port, the input port of the bypass module coupled to the primary winding of the transformer, the output port of the bypass module coupled to the output port of the converter module, the bypass module configured to remove a fault when the converter module, or the transformer fails or is abnormal, and to communicate the input voltage directly to the output.
3. The high voltage ac line voltage regulation system of claim 1, wherein the primary winding of the transformer is star connected.
4. The high voltage ac line voltage regulation system of claim 1, wherein the current conversion module further comprises:
the bridge circuit of the two-phase inverter consists of a two-level inverter circuit or a neutral point clamping three-level inverter circuit, wherein the neutral point of one bridge arm of the bridge circuit of the two-phase inverter is used as an input port of the converter module;
two groups of serially connected capacitors, wherein one end of each capacitor is connected with the positive electrode of the bridge circuit of the two-phase inverter, the other end of each capacitor is connected with the negative electrode of the bridge circuit of the two-phase inverter, and the middle points of the two groups of serially connected capacitors are used as the other input port of the current transformation module;
and one end of the filter is connected with the middle point of one bridge arm in the bridge circuit of the two-phase inverter, and the other end of the filter is used as an output port of the current transformation module and is used for filtering out output current and voltage harmonic waves of the current transformation module.
5. The high voltage ac line voltage regulation system of claim 1, wherein the commutation module comprises two switches coupled in series with a point being an input port of the commutation module and the other two ends being two output ports of the commutation module; the switch is composed of a mechanical switch or a bidirectional thyristor, and the bidirectional thyristor is composed of a forward thyristor and a reverse thyristor which are connected in parallel; the switch can also be formed by connecting a mechanical switch and a bidirectional thyristor in parallel and is connected into a compound switch; the switch may also be composed of two IG BT's coupled in anti-series; through the switching of the two switches, the connection polarity of the secondary winding of the transformer can be changed, and the output voltage of the system can be increased or decreased.
6. The high voltage ac line voltage regulation system of claim 1 wherein the commutation module includes a jumper conductor having one end as an input port of the commutation module and the other end as an output port of the commutation module, the jumper conductor being used to reduce system cost in applications where voltage boosting or lowering by switching windings is not required.
7. The bypass module according to claim 2, characterized in that the bypass module is constituted by a switch constituted by a mechanical switch or a triac constituted by a parallel connection of two thyristors in the forward and reverse directions; the switch can also be formed by connecting a mechanical switch and a bidirectional thyristor in parallel, and is connected into a compound switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310843849.4A CN117013851A (en) | 2023-07-11 | 2023-07-11 | High-voltage alternating current line voltage stabilizing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310843849.4A CN117013851A (en) | 2023-07-11 | 2023-07-11 | High-voltage alternating current line voltage stabilizing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117013851A true CN117013851A (en) | 2023-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310843849.4A Pending CN117013851A (en) | 2023-07-11 | 2023-07-11 | High-voltage alternating current line voltage stabilizing system |
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| Country | Link |
|---|---|
| CN (1) | CN117013851A (en) |
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2023
- 2023-07-11 CN CN202310843849.4A patent/CN117013851A/en active Pending
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