CN113067321B - Overvoltage protection device of unified power flow controller - Google Patents
Overvoltage protection device of unified power flow controller Download PDFInfo
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- CN113067321B CN113067321B CN202010001829.9A CN202010001829A CN113067321B CN 113067321 B CN113067321 B CN 113067321B CN 202010001829 A CN202010001829 A CN 202010001829A CN 113067321 B CN113067321 B CN 113067321B
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- lightning arrester
- arrester
- flow controller
- power flow
- protection device
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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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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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
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses an overvoltage protection device of a unified power flow controller, which comprises first to fifth lightning arresters, a bypass circuit breaker and a resistor I, wherein the first to fifth lightning arresters are connected with the first to fifth lightning arresters respectively; the first lightning arrester is arranged on the valve side of the parallel transformer; the second lightning arrester is arranged on the alternating current side of the converter valve and is grounded through a resistor I; the third lightning arrester is connected in parallel to the valve side of the series transformer and is grounded through the fourth lightning arrester, and the neutral point of the third lightning arrester is connected with the neutral point of the series transformer; the fifth lightning arrester and the bypass breaker are bridged at two ends of the line side of the series transformer; the overvoltage protection device reduces the overvoltage of the unified power flow controller and improves the reliability and the economy of the unified power flow controller.
Description
Technical Field
The invention relates to the field of flexible alternating current transmission, in particular to an overvoltage protection device of a unified power flow controller.
Background
A modern power system is a complex alternating current-direct current hybrid power grid with both direct current transmission and alternating current transmission, and various problems exist in the power grid, for example, the regional difference between a load center and a power generation center is large, so that the problem of tidal current distribution difference of a power transmission channel is increasingly prominent, and the capacity of the power transmission channel cannot be well exerted. Meanwhile, the difficulty and cost of building a new transmission channel of the urban power grid are increased, and the difficulty of line transformation and capacity expansion is increased. The traditional control means is difficult to solve the problems and becomes an important factor for limiting the transmission of the power system.
The Unified Power Flow Controller (UPFC) can control the Power Flow of the line and improve the Power transmission capability of the line. The simplest UPFC consists of two converters connected by a common dc bus, one converter connected to the ac system by a parallel transformer and the other connected in series to the ac line by a series transformer.
The current overvoltage protection device of the unified power flow controller converter uses two groups of lightning arresters on the valve side of a series transformer, and a thyristor bypass switch and a low-voltage bypass circuit breaker on the valve side of the series transformer are added, so that an optimization space exists. The overvoltage protection device provided by the invention optimizes the configuration, and improves the economy of the unified power flow controller while ensuring the safety of the unified power flow control.
Disclosure of Invention
Aiming at the place to be improved in the prior art, the invention provides the converter overvoltage protection device of the unified power flow controller, which can effectively reduce the overvoltage protection level of the unified power flow controller, and improve the economy of the unified power flow controller while ensuring the safe operation of the unified power flow controller.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
an overvoltage protection device of a unified power flow controller, comprising: the lightning arrester comprises first to fifth lightning arresters, a bypass breaker and a resistor I; the first lightning arrester is arranged on the valve side of the parallel transformer; the second lightning arrester is arranged on the alternating current side of the converter valve and is grounded through a resistor I; the third lightning arrester is connected in parallel to the valve side of the series transformer and is grounded through the fourth lightning arrester, and the neutral point of the third lightning arrester is connected with the neutral point of the series transformer; the fifth lightning arrester and the bypass breaker are connected in parallel across the two ends of the line side of the series transformer.
Furthermore, after the unified power flow controller detects that the converter valves on the series side are locked, the bypass circuit breaker is immediately switched on.
Furthermore, the first lightning arrester, the second lightning arrester and the fifth lightning arrester adopt gapless zinc oxide lightning arresters.
Further, the matching principle of the parameters of the second lightning arrester, the third lightning arrester and the fifth lightning arrester is as follows: when the alternating current system breaks down, energy is absorbed by the second lightning arrester and the third lightning arrester, and the energy absorbed by the fifth lightning arrester is smaller than a set threshold value.
Further, the operation impact protection level of the second lightning arrester is less than 0.9 times of the direct current operating voltage of the unified power flow controller.
Further, the selection principle of the resistor I is as follows: and limiting the current flowing through the converter valve before the converter valve is locked under the direct-current side grounding fault of the unified power flow controller within 2 times of the rated current of the converter valve.
The invention has the beneficial effects that: the overvoltage protection device reduces the overvoltage of the unified power flow controller, and improves the economy of the unified power flow controller while ensuring the safe operation of the unified power flow controller.
Drawings
Fig. 1 is a schematic diagram of an overvoltage protection device of a unified power flow controller.
Wherein, 1-a first lightning arrester; 2-a second lightning arrester; 3-a third arrester; 4-a fourth arrester; 5-fifth arrester.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
The invention provides an overvoltage protection device of a unified power flow controller, which comprises: the first to fifth arresters, the bypass circuit breaker and the resistor I; the first lightning arrester is arranged on the valve side of the parallel transformer; the second lightning arrester is arranged on the alternating current side of the converter valve and is grounded through a resistor I; the third lightning arrester is connected in parallel to the valve side of the series transformer and is grounded through the fourth lightning arrester, and the neutral point of the third lightning arrester is connected with the neutral point of the series transformer; the fifth lightning arrester and the bypass breaker are connected in parallel across the two ends of the line side of the series transformer.
And after the unified power flow controller detects that the converter valves on the series side are locked, the bypass circuit breaker is immediately switched on.
And the first lightning arrester, the second lightning arrester and the fifth lightning arrester adopt gapless zinc oxide lightning arresters.
The matching principle of the parameters of the second arrester, the third arrester and the fifth arrester is as follows: when the alternating current system breaks down, energy is absorbed by the second lightning arrester and the third lightning arrester, and the energy absorbed by the fifth lightning arrester is smaller than a set threshold value. The fifth lightning arrester is used for limiting overvoltage of lightning invasion waves.
And the operation impact protection level of the second lightning arrester is less than 0.9 time of the direct current operating voltage of the unified power flow controller.
The selection principle of the resistor I is as follows: and limiting the current flowing through the converter valve before the converter valve is locked under the direct-current side grounding fault of the unified power flow controller within 2 times of the rated current of the converter valve.
Fig. 1 shows a preferred embodiment of an overvoltage protection device for a unified power flow controller. The unified power flow controller main equipment comprises a parallel transformer, a parallel converter, a series converter and a series transformer. The parallel transformer and the series transformer both adopt a double-winding structure, one side of the parallel transformer is connected in parallel with an alternating current system, the other side of the parallel transformer is connected with a parallel converter, and the parallel converter comprises a converter valve and a bridge arm reactor. One side of the series transformer is connected with an alternating current circuit in series, the other side of the series transformer is connected with a series current converter, and the series current converter and the parallel current converter adopt the same parameters and structures. The rated voltage of the grid side of the parallel transformer is 110kV, the rated voltage of the valve side of the parallel transformer is 20.8kV, and the resistance value of the neutral point resistor of the parallel transformer is 5000 ohms; the rated voltage of the line side of the series transformer is 38kV, the rated voltage of the valve side of the series transformer is 20.8kV, and the resistance value of the neutral point resistor of the series transformer is 5000 ohms. The rated voltage of the direct current side of the unified power flow controller is 20kV, and the voltage level of a line connected with the unified power flow controller in series is 110kV.
The first lightning arrester is connected in parallel with the valve side of the parallel transformer, and the operation impact level of the first lightning arrester is 56kV; the second lightning arrester is connected in parallel to the alternating current side of the converter valve and is in star connection, a neutral point is grounded through a resistor I, the operating impact protection level of the second lightning arrester is 36kV, and the resistance value of the resistor I is 50 ohms; the third lightning arrester is connected in parallel to the valve side of the series transformer in a star connection mode, the neutral point is connected with the neutral point of the transformer and is grounded through the fourth lightning arrester, the operating impact protection level of the third lightning arrester is 45kV, and the operating impact protection level of the fourth lightning arrester is 30kV; the fifth lightning arrester and the bypass breaker are connected in parallel at two ends of the line side of the series transformer, the operation impact protection level of the fifth lightning arrester is 90kV, and the bypass time of the bypass breaker is not more than 40ms. The first lightning arrester, the second lightning arrester and the fifth lightning arrester are all gapless zinc oxide lightning arresters.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (5)
1. An overvoltage protection device for a unified power flow controller, comprising: the lightning arrester comprises first to fifth lightning arresters, a bypass breaker and a resistor I; the first lightning arrester is arranged on the valve side of the parallel transformer; the second lightning arrester is arranged on the alternating current side of the converter valve and is grounded through a resistor I; the third lightning arrester is connected in parallel to the valve side of the series transformer and is grounded through the fourth lightning arrester, and the neutral point of the third lightning arrester is connected with the neutral point of the series transformer; the fifth lightning arrester and the bypass breaker are connected in parallel and bridged at two ends of the line side of the series transformer; the matching principle of the parameters of the second arrester, the third arrester and the fifth arrester is as follows: when the alternating current system breaks down, energy is absorbed by the second lightning arrester and the third lightning arrester, and the energy absorbed by the fifth lightning arrester is smaller than a set threshold value.
2. The overvoltage protection device of claim 1, wherein the unified power flow controller detects that the series-side converter valve is blocked and the bypass breaker is immediately closed.
3. The overvoltage protection device of claim 1, wherein each of said first through fifth arresters is a gapless zinc oxide arrester.
4. The overvoltage protection device of claim 1, wherein the second surge arrester has an operating surge protection level of less than 0.9 times a dc operating voltage of the unified power flow controller.
5. The overvoltage protection device of claim 1, wherein said resistor I is selected from the group consisting of: and limiting the current flowing through the converter valve before the converter valve is locked under the direct-current side grounding fault of the unified power flow controller within 2 times of the rated current of the converter valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001829.9A CN113067321B (en) | 2020-01-02 | 2020-01-02 | Overvoltage protection device of unified power flow controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001829.9A CN113067321B (en) | 2020-01-02 | 2020-01-02 | Overvoltage protection device of unified power flow controller |
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| CN113067321A CN113067321A (en) | 2021-07-02 |
| CN113067321B true CN113067321B (en) | 2022-12-13 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2416645Y (en) * | 2000-04-26 | 2001-01-24 | 西安神电避雷器有限公司 | Three-phase combined lightning arrester |
| CN1443388A (en) * | 2000-07-21 | 2003-09-17 | 皇家Kpn公司 | System for overvoltage protection |
| CN203180510U (en) * | 2013-03-05 | 2013-09-04 | 上海上友电气科技有限公司 | Combined overvoltage protector of resistance capacitance lightening arrester |
| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
-
2020
- 2020-01-02 CN CN202010001829.9A patent/CN113067321B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2416645Y (en) * | 2000-04-26 | 2001-01-24 | 西安神电避雷器有限公司 | Three-phase combined lightning arrester |
| CN1443388A (en) * | 2000-07-21 | 2003-09-17 | 皇家Kpn公司 | System for overvoltage protection |
| CN203180510U (en) * | 2013-03-05 | 2013-09-04 | 上海上友电气科技有限公司 | Combined overvoltage protector of resistance capacitance lightening arrester |
| CN104467393A (en) * | 2015-01-04 | 2015-03-25 | 南京南瑞继保电气有限公司 | Device for preventing sub-module capacitor overvoltage |
Non-Patent Citations (1)
| Title |
|---|
| "UPFC暂态过电压研究";刘永刚;《供用电》;20170815;第34卷(第8期);第23-27页 * |
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| CN113067321A (en) | 2021-07-02 |
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