CN112242702A - Controllable phase shifter and control method thereof - Google Patents
Controllable phase shifter and control method thereof Download PDFInfo
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- CN112242702A CN112242702A CN201910652272.2A CN201910652272A CN112242702A CN 112242702 A CN112242702 A CN 112242702A CN 201910652272 A CN201910652272 A CN 201910652272A CN 112242702 A CN112242702 A CN 112242702A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- 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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
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Abstract
The invention discloses a controllable phase shifter, comprising: the device comprises a series transformer, a shunt transformer, a voltage regulating switch and a current limiter, wherein the current limiter is formed by connecting a bypass switch and a reactor in parallel; the current limiter is connected in series in the secondary side branch of the series transformer or in the secondary side branch of the parallel transformer; the three groups of the secondary side branch of the series transformer, the primary side branch of the parallel transformer and the secondary side branch of the parallel transformer are connected in a triangular mode, and the other two groups of the three groups of the secondary side branch of the parallel transformer are connected in a star mode; the primary side branch of the series transformer is connected in series in the power transmission line, the primary side branch of the parallel transformer is connected with the primary side branch of the series transformer, and the secondary side branch of the series transformer is connected with the secondary side branch of the parallel transformer. The invention also discloses a control method of the controllable phase shifter. By adopting the technical scheme of the invention, the tide of the power grid can be controlled, the short-circuit current level can be inhibited, and the transmission capacity, the equipment utilization rate and the safety of the power grid can be improved.
Description
Technical Field
The invention belongs to the field of flexible alternating current Transmission FACTS (Flexible AC Transmission systems), and particularly relates to a controllable phase shifter and a control method thereof.
Background
With the development of economy, the demand for electric power is continuously increased, the scale of the power grid is also continuously enlarged, and the following problems exist in the development process: due to the influence of natural distribution of power grid power flow, the problem of uneven power flow distribution of a power transmission section exists in a power grid in many areas, and the transmission capacity of the power grid and the utilization rate of power grid equipment are influenced due to heavy load of part of lines and light load of part of lines; because the geographical distribution of an energy center and a load center in China is inconsistent, the power of the energy center is transmitted to the load center by means of an extra-high voltage alternating current and direct current technology, and the existence of a multi-voltage level electromagnetic ring network of the load center makes the power flow of a power grid difficult to control, so that on one hand, the power flow of a power transmission channel is uneven, the power transmission capacity of a power transmission line cannot be exerted, and on the other hand, a large amount of power flow can be transferred to a lower-level power grid when a higher-level power grid has a; the gradual development of the power market, the grid connection of new energy power generation, the random characteristics of power flow of a power grid are increasingly obvious, the power flow of the power grid is difficult to control, and the safe and stable operation of the power grid is possibly endangered; in addition, as the size of the power grid is enlarged, the short-circuit current level is also rapidly increased and is close to or exceeds the maximum allowable capacity of the circuit breaker, the electrical equipment can be seriously damaged by the heat generation and electrodynamic force effect generated when the short-circuit current passes through the electrical equipment and the current carrying part, and an effective means is needed for restraining the short-circuit current level of the system. Therefore, the power grid has urgent needs for improving the transmission capacity and suppressing the short-circuit current.
The traditional method is adopted to solve the problems, or the investment is huge, or the effect is not ideal. The flexible alternating current transmission technology realizes the adjustment and control of the voltage, the impedance and the phase angle of the power system, thereby greatly improving the transmission capacity of the line, improving the stability level of the power system, balancing the power flow of a power grid and fully improving the utilization rate of a power transmission network. The flexible alternating current transmission technologies such as the unified power flow controller and the controllable phase shifter have a power flow control function, and have certain capacity of inhibiting short-circuit current of a power grid after being improved on the basis of the existing structure.
Disclosure of Invention
The invention aims to provide a controllable phase shifter and a control method thereof, which are used for controlling the tide of a power grid, inhibiting the short-circuit current level and improving the transmission capacity, equipment utilization rate and safety of the power grid.
In order to achieve the above purpose, the solution of the invention is:
a controllable phase shifter comprises a series transformer, a shunt transformer, a voltage regulating switch and a current limiter, wherein the current limiter is formed by connecting a bypass switch and a reactor in parallel; the primary side branch of the series transformer comprises a primary side winding of the series transformer, and the secondary side branch of the series transformer comprises a secondary side winding of the series transformer; the primary side branch of the parallel transformer comprises a primary side winding of the parallel transformer, and the secondary side branch of the parallel transformer comprises a secondary side winding of the parallel transformer and a voltage regulating switch connected with a tap of the secondary side winding of the parallel transformer; the current limiter is connected in series in the secondary side branch of the series transformer or in the secondary side branch of the parallel transformer; the three groups of the secondary side branch of the series transformer, the primary side branch of the parallel transformer and the secondary side branch of the parallel transformer are connected in a triangular mode, and the other two groups of the three groups of the secondary side branch of the parallel transformer are connected in a star mode; the primary side branch of the series transformer is connected in series in the power transmission line, the primary side branch of the parallel transformer is connected with the primary side branch of the series transformer, and the secondary side branch of the series transformer is connected with the secondary side branch of the parallel transformer.
Furthermore, the primary side branch of the parallel transformer is in star connection, the secondary side branch of the parallel transformer is in star connection, and the secondary side branch of the series transformer is in triangle connection; each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is two ends or the middle point of the primary side winding of the series transformer; two ends of the A phase of the secondary side branch of the series transformer are respectively connected with the B phase and the C phase of the secondary side branch of the parallel transformer, two ends of the B phase of the secondary side branch of the series transformer are respectively connected with the C phase and the A phase of the secondary side branch of the parallel transformer, and two ends of the C phase of the secondary side branch of the series transformer are respectively connected with the A phase and the B phase of the secondary side branch of the parallel transformer.
Furthermore, the primary side branch of the parallel transformer is in triangular connection, the secondary side branch of the parallel transformer is in star connection, and the secondary side branch of the series transformer is in star connection; the two ends of the A phase of the primary side branch of the parallel transformer are respectively connected with the B phase and the C phase of the primary side branch of the series transformer, the two ends of the B phase of the primary side branch of the parallel transformer are respectively connected with the C phase and the A phase of the primary side branch of the series transformer, the two ends of the C phase of the primary side branch of the parallel transformer are respectively connected with the A phase and the B phase of the primary side branch of the series transformer, and the connection point is the two ends or; each phase of the secondary side branch of the parallel transformer is correspondingly connected with the secondary side branch of the series transformer.
Furthermore, the primary side branch of the parallel transformer is in star connection, the secondary side branch of the parallel transformer is in triangle connection, and the secondary side branch of the series transformer is in star connection; each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is two ends or the middle point of the primary side winding of the series transformer; two ends of the secondary side branch A of the parallel transformer are respectively connected with the secondary side branch B and C of the series transformer, two ends of the secondary side branch B of the parallel transformer are respectively connected with the secondary side branch C and A of the series transformer, and two ends of the secondary side branch C of the parallel transformer are respectively connected with the secondary side branch A and B of the series transformer.
Further, the bypass switch is a mechanical fast bypass switch or a power electronic fast bypass switch.
Further, a tap of the secondary winding of the parallel transformer is connected with a voltage regulating switch, and the voltage regulating switch is an on-load voltage regulating switch or a power electronic switch.
A control method of a controllable phase shifter: when the reactor normally operates, the bypass switch is turned on, and the bypass switch keeps on-position to bypass the reactor; when a fault occurs on a line, the bypass switch of the bypass switch is positioned, and the reactor is put into operation; and after the fault is cleared and the line is recovered to operate, the bypass switch is switched on, and the bypass switch keeps on-position to bypass the reactor.
After the scheme is adopted, the invention has the following beneficial effects:
(1) when the reactor normally operates, the reactor quits operation through the bypass switch, only the phase shifter operates, the means of controlling the power flow of the power grid is increased, and the transmission capacity of the power grid is improved;
(2) when the fault occurs, the bypass switch is switched off, the reactor is put into operation, the integral equivalent impedance of the controllable phase shifter is increased, and the short-circuit current of the system is inhibited.
Drawings
Fig. 1 is a first implementation of a controllable phase shifter;
FIG. 2 is a second implementation of a controllable phase shifter;
fig. 3 shows a third implementation of a controllable phase shifter.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
A controllable phase shifter of the present invention: the device comprises a series transformer, a shunt transformer, a voltage regulating switch and a current limiter, wherein the current limiter is formed by connecting a bypass switch and a reactor in parallel; the primary side branch of the series transformer comprises a primary side winding of the series transformer, and the secondary side branch of the series transformer comprises a secondary side winding of the series transformer; the primary side branch of the parallel transformer comprises a primary side winding of the parallel transformer, and the secondary side branch of the parallel transformer comprises a secondary side winding of the parallel transformer and a voltage regulating switch connected with a tap of the secondary side winding of the parallel transformer; the current limiter is connected in series in the secondary side branch of the series transformer or in the secondary side branch of the parallel transformer;
the three groups of the secondary side branch of the series transformer, the primary side branch of the parallel transformer and the secondary side branch of the parallel transformer are connected in a triangular mode, and the other two groups of the three groups of the secondary side branch of the parallel transformer are connected in a star mode; the primary side branch of the series transformer is connected in series in the power transmission line, the primary side branch of the parallel transformer is connected with the primary side branch of the series transformer, and the secondary side branch of the series transformer is connected with the secondary side branch of the parallel transformer. The bypass switch is a mechanical quick bypass switch or a power electronic quick bypass switch; the voltage regulating switch is an on-load voltage regulating switch or a power electronic switch.
Fig. 1 is an implementation form of a controllable phase shifter provided by the present invention, which includes a series transformer, a shunt transformer, and a current limiter, where the current limiter is formed by connecting a fast bypass switch BP and a current-limiting reactor L in parallel. The primary side branch of the series transformer comprises a primary winding S1, the secondary side branch of the series transformer comprises a secondary winding S2 and a current limiter connected in series with the secondary winding S2, the primary side branch of the parallel transformer comprises a primary winding E1, and the secondary side branch of the parallel transformer comprises a secondary winding E2 and an on-load tap changer connected with a tap of the secondary winding E2. The primary side branch of the series transformer is connected in series in the transmission line, the secondary side branch of the series transformer is in triangular connection, the primary side branch of the parallel transformer is in star connection, and the secondary side branch of the parallel transformer is in star connection. Each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is the middle point of the primary side winding of the series transformer. Two ends of the A phase of the secondary side branch of the series transformer are respectively connected with the B phase and the C phase of the secondary side branch of the parallel transformer, two ends of the B phase of the secondary side branch of the series transformer are respectively connected with the C phase and the A phase of the secondary side branch of the parallel transformer, and two ends of the C phase of the secondary side branch of the series transformer are respectively connected with the A phase and the B phase of the secondary side branch of the parallel transformer.
Fig. 2 is an implementation form of a controllable phase shifter provided by the present invention, which includes a series transformer, a shunt transformer, and a current limiter, where the current limiter is formed by connecting a fast bypass switch BP and a current-limiting reactor L in parallel. The primary side branch of the series transformer comprises a primary winding S1, the secondary side branch of the series transformer comprises a secondary winding S2 and a current limiter connected in series with the secondary winding S2, the primary side branch of the parallel transformer comprises a primary winding E1, and the secondary side branch of the parallel transformer comprises a secondary winding E2 and an on-load tap changer connected with a tap of the secondary winding E2. The primary side branch of the series transformer is connected in series in the transmission line, the secondary side branch of the series transformer is in star connection, the primary side branch of the parallel transformer is in triangle connection, and the secondary side branch of the parallel transformer is in star connection. The two ends of the A phase of the primary side branch of the parallel transformer are respectively connected with the B phase and the C phase of the primary side branch of the series transformer, the two ends of the B phase of the primary side branch of the parallel transformer are respectively connected with the C phase and the A phase of the primary side branch of the series transformer, the two ends of the C phase of the primary side branch of the parallel transformer are respectively connected with the A phase and the B phase of the primary side branch of the series transformer, and the connection point is the two ends or; each phase of the secondary side branch of the parallel transformer is correspondingly connected with the secondary side branch of the series transformer.
Fig. 3 shows another implementation form of the controllable phase shifter according to the present invention, which includes a series transformer, a shunt transformer, and a current limiter, where the current limiter is formed by connecting a fast bypass switch BP and a current-limiting reactor L in parallel. The primary side branch of the series transformer comprises a primary winding S1, the secondary side branch of the series transformer comprises a secondary winding S2 and a current limiter connected in series with the secondary winding S2, the primary side branch of the parallel transformer comprises a primary winding E1, and the secondary side branch of the parallel transformer comprises a secondary winding E2 and an on-load tap changer connected with a tap of the secondary winding E2. The primary side branch of the series transformer is connected in series in the transmission line, the secondary side branch of the series transformer is in star connection, the primary side branch of the parallel transformer is in star connection, and the secondary side branch of the parallel transformer is in triangle connection. Each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is two ends or the middle point of the primary side winding of the series transformer; two ends of the secondary side branch A of the parallel transformer are respectively connected with the secondary side branch B and C of the series transformer, two ends of the secondary side branch B of the parallel transformer are respectively connected with the secondary side branch C and A of the series transformer, and two ends of the secondary side branch C of the parallel transformer are respectively connected with the secondary side branch A and B of the series transformer.
In the above three implementations of the controllable phase shifter, the current limiter may also be connected in series in the secondary branch of the shunt transformer.
When the controllable phase shifter operates normally, a bypass switch of the current limiter is switched on and keeps on the closed position, the current limiting reactor is bypassed, and an on-load tap changer of a secondary side branch of the shunt transformer is controlled to regulate the voltage which is output to a line by the controllable phase shifter in series so as to control the tide of the line. When the system has a fault, the bypass switch of the current limiter is switched off, the current-limiting reactor is put in, and the integral equivalent impedance of the controllable phase shifter is increased, so that the short-circuit current of the system is inhibited.
Finally, it should be noted that: the technical solutions of the present invention are only illustrated in conjunction with the above-mentioned embodiments, and not limited thereto. Those of ordinary skill in the art will understand that: modifications and equivalents may be made to the embodiments of the invention by those skilled in the art, which modifications and equivalents are within the scope of the claims appended hereto.
Claims (7)
1. A controllable phase shifter, comprising: the device comprises a series transformer, a shunt transformer, a voltage regulating switch and a current limiter, wherein the current limiter is formed by connecting a bypass switch and a reactor in parallel; the primary side branch of the series transformer comprises a primary side winding of the series transformer, and the secondary side branch of the series transformer comprises a secondary side winding of the series transformer; the primary side branch of the parallel transformer comprises a primary side winding of the parallel transformer, and the secondary side branch of the parallel transformer comprises a secondary side winding of the parallel transformer and a voltage regulating switch connected with a tap of the secondary side winding of the parallel transformer; the current limiter is connected in series in the secondary side branch of the series transformer or in the secondary side branch of the parallel transformer;
the three groups of the secondary side branch of the series transformer, the primary side branch of the parallel transformer and the secondary side branch of the parallel transformer are connected in a triangular mode, and the other two groups of the three groups of the secondary side branch of the parallel transformer are connected in a star mode; the primary side branch of the series transformer is connected in series in the power transmission line, the primary side branch of the parallel transformer is connected with the primary side branch of the series transformer, and the secondary side branch of the series transformer is connected with the secondary side branch of the parallel transformer.
2. A controllable phase shifter as claimed in claim 1, wherein: the primary side branch of the parallel transformer is in star connection, the secondary side branch of the parallel transformer is in star connection, and the secondary side branch of the series transformer is in triangle connection; each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is two ends or the middle point of the primary side winding of the series transformer; two ends of the A phase of the secondary side branch of the series transformer are respectively connected with the B phase and the C phase of the secondary side branch of the parallel transformer, two ends of the B phase of the secondary side branch of the series transformer are respectively connected with the C phase and the A phase of the secondary side branch of the parallel transformer, and two ends of the C phase of the secondary side branch of the series transformer are respectively connected with the A phase and the B phase of the secondary side branch of the parallel transformer.
3. A controllable phase shifter as claimed in claim 1, wherein: the primary side branch of the parallel transformer is in triangular connection, the secondary side branch of the parallel transformer is in star connection, and the secondary side branch of the series transformer is in star connection; the two ends of the A phase of the primary side branch of the parallel transformer are respectively connected with the B phase and the C phase of the primary side branch of the series transformer, the two ends of the B phase of the primary side branch of the parallel transformer are respectively connected with the C phase and the A phase of the primary side branch of the series transformer, the two ends of the C phase of the primary side branch of the parallel transformer are respectively connected with the A phase and the B phase of the primary side branch of the series transformer, and the connection point is the two ends or; each phase of the secondary side branch of the parallel transformer is correspondingly connected with the secondary side branch of the series transformer.
4. A controllable phase shifter as claimed in claim 1, wherein: the primary side branch of the parallel transformer is in star connection, the secondary side branch of the parallel transformer is in triangle connection, and the secondary side branch of the series transformer is in star connection; each phase of the primary side branch of the parallel transformer is correspondingly connected with the primary side branch of the series transformer, and the connection point is two ends or the middle point of the primary side winding of the series transformer; two ends of the secondary side branch A of the parallel transformer are respectively connected with the secondary side branch B and C of the series transformer, two ends of the secondary side branch B of the parallel transformer are respectively connected with the secondary side branch C and A of the series transformer, and two ends of the secondary side branch C of the parallel transformer are respectively connected with the secondary side branch A and B of the series transformer.
5. A controllable phase shifter as claimed in claim 1, wherein: the bypass switch is a mechanical fast bypass switch or a power electronic fast bypass switch.
6. A controllable phase shifter as claimed in claim 1, wherein: the voltage regulating switch is an on-load voltage regulating switch or a power electronic switch.
7. A method of controlling a controllable phase shifter according to any one of claims 1 to 6, characterized by: when the reactor normally operates, the bypass switch is turned on, and the bypass switch keeps on-position to bypass the reactor; when a fault occurs on a line, a bypass switch is divided, and the bypass switch is used for putting the reactor into a position; and after the fault is cleared and the line is recovered to operate, the bypass switch is switched on, and the bypass switch keeps on-position to bypass the reactor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910652272.2A CN112242702A (en) | 2019-07-19 | 2019-07-19 | Controllable phase shifter and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910652272.2A CN112242702A (en) | 2019-07-19 | 2019-07-19 | Controllable phase shifter and control method thereof |
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| CN201910652272.2A Pending CN112242702A (en) | 2019-07-19 | 2019-07-19 | Controllable phase shifter and control method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903568A (en) * | 2021-09-30 | 2022-01-07 | 广东电网有限责任公司 | Phase shifter |
| CN114121449A (en) * | 2021-11-25 | 2022-03-01 | 云南电网有限责任公司电力科学研究院 | Phase-shifting transformer |
| WO2024051869A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Three-phase voltage impedance adjustable transformer and control method and control apparatus therefor, computer device, storage medium and computer program product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934974A (en) * | 2015-07-01 | 2015-09-23 | 国网智能电网研究院 | Controllable phase shifter with short-circuit current limiting function |
| CN105703370A (en) * | 2016-03-08 | 2016-06-22 | 全球能源互联网研究院 | Series compensation and transverter-combined unified power flow controller |
-
2019
- 2019-07-19 CN CN201910652272.2A patent/CN112242702A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934974A (en) * | 2015-07-01 | 2015-09-23 | 国网智能电网研究院 | Controllable phase shifter with short-circuit current limiting function |
| CN105703370A (en) * | 2016-03-08 | 2016-06-22 | 全球能源互联网研究院 | Series compensation and transverter-combined unified power flow controller |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113903568A (en) * | 2021-09-30 | 2022-01-07 | 广东电网有限责任公司 | Phase shifter |
| CN114121449A (en) * | 2021-11-25 | 2022-03-01 | 云南电网有限责任公司电力科学研究院 | Phase-shifting transformer |
| WO2024051869A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Three-phase voltage impedance adjustable transformer and control method and control apparatus therefor, computer device, storage medium and computer program product |
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Application publication date: 20210119 |
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