CN113765060A - Method for setting over-voltage protection and low-voltage protection values of generator - Google Patents
Method for setting over-voltage protection and low-voltage protection values of generator Download PDFInfo
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- CN113765060A CN113765060A CN202110923701.2A CN202110923701A CN113765060A CN 113765060 A CN113765060 A CN 113765060A CN 202110923701 A CN202110923701 A CN 202110923701A CN 113765060 A CN113765060 A CN 113765060A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000006855 networking Effects 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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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
- H02H7/06—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 for dynamo-electric generators; for synchronous capacitors
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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
- H02H7/04—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 for transformers
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Protection Of Generators And Motors (AREA)
Abstract
Setting the over-voltage protection setting value of the generator to be smaller than the setting value U of the over-voltage protection of the transformergSetting value of generator low-voltage protection is set to be larger than setting value U of transformer low-voltage protectiond. For the overvoltage generator, the generator trips before the voltage of the generator does not reach the overvoltage fixed value of the transformer, so that the generator is prevented from generating high voltage, and overvoltage tripping of a plurality of transformers connected to the grid is avoided. The small hydropower station is normally connected with the Internet to generate general high voltage on a line, and the small hydropower station can generate over-limit high voltage by tripping a switch due to line faults, and both the small hydropower station and the over-voltage protection device can cause tripping of the small hydropower station, so that the protection is not selective; by using the generator overvoltage protection setting method, the over-limit high voltage generated by the tripping of the switch caused by the line fault can be cut off, and the over-limit high voltage generated by the normal networking of small hydropower stations can not be cut offThe common high voltage avoids the misoperation of overvoltage protection of small hydropower stations, and the overvoltage protection is selective.
Description
Technical Field
The invention belongs to the field of overvoltage protection and low-voltage protection of generators, and particularly relates to a setting value setting method for overvoltage protection and low-voltage protection of a distributed small hydroelectric hydraulic generator.
Background
In a 10kV small hydropower and transformer power supply mixed line; in a water-rich period, as a large number of small hydropower stations are used for power generation and surfing the Internet, the voltage at the tail end of the 10kV line is slowly raised to generate a common high voltage, and the influence on the system is small; when a line fault trips to cause sudden load shedding of a small hydropower station or when the small hydropower station runs in an isolated island with a transformer, a high-frequency and high-voltage working condition can occur, and under the extreme condition, the voltage rapidly rises in a short time to generate an over-limit high voltage which is far higher than a qualified value. The two high voltages can affect the user electric equipment, even burn out the user equipment, and the "out-of-limit high voltage" can also cause the system voltage to fluctuate greatly and damage greatly.
Disclosure of Invention
The generator generates high voltage to cause the system voltage to rise, and when the system voltage reaches the over-voltage protection setting value of the transformer, the transformer trips and loses voltage. The invention aims to solve the problem of providing a setting value setting method for overvoltage protection and low voltage protection for a small hydroelectric generator running in a 10kV power generation and supply hybrid line, and avoiding the problem of tripping and voltage loss of a transformer caused by overvoltage or low voltage generated by the running of a small hydroelectric generator.
In order to solve the problems, the invention provides a method for setting an overvoltage protection setting value of a generator, which comprises the following steps:
s1: firstly, determining a setting value U of overvoltage protection of a transformer of a power grid where the generator is positionedg；
S2: setting the generator overvoltage protection setting value to k Ug(ii) a Where k is the motion coefficient.
Further improved, the overvoltage protection action coefficient is as follows: k is less than 1.
Further improved, the overvoltage protection action coefficient is as follows: k is 0.95.
The invention relates to a method for setting a low-voltage protection setting value of a generator, which comprises the following steps of:
S1：firstly, determining a setting value U of low-voltage protection of a transformer of a power grid where the generator is positionedd；
S2: setting the generator low-voltage protection setting value to k 1Ud(ii) a Where k1 is an action coefficient.
Further improved, the low voltage protection action coefficient is: k1 > 1.
Further improved, the low voltage protection action coefficient is: k1 is 1.05.
After the method is used, for the overvoltage generator, the generator trips before the voltage of the generator does not reach the overvoltage fixed value of the transformer, so that the generator is prevented from generating high voltage, and multiple transformers connected to the grid are prevented from tripping due to overvoltage; after the generator trips, other generators can still generate power normally, and the power failure range is reduced. By using the overvoltage protection setting method, the overvoltage protection of the generator can only break the over-limit high voltage generated by the tripping of the switch due to the line fault in the face of the general high voltage and the over-limit high voltage generated by the generator, and can not break the general high voltage generated by the normal internet surfing of the small hydropower station, so that the misoperation of the overvoltage protection of the small hydropower station is avoided, and the overvoltage protection has selectivity.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of a 10kV small hydropower station and transformer power supply hybrid circuit.
FIG. 2 is a schematic diagram of over-voltage protection and low-voltage protection setting values of the generator;
in the figure: u is rated voltage, Ug is transformer overvoltage protection setting value, Ud is transformer low voltage protection setting value, 0.95 Ug is generator overvoltage protection setting value, and 1.05 Ud is generator low voltage protection setting value.
As shown in fig. 1, in a 10kV small hydropower and transformer power supply hybrid line; in a water-rich period, as a large number of small hydropower stations are used for power generation and surfing the Internet, the voltage at the tail end of the 10kV line is slowly raised to generate a common high voltage, and the influence on the system is small; when a small hydropower station suddenly gets rid of a load runaway or the small hydropower station and a transformer are in isolated island operation due to circuit fault tripping, a high-frequency and high-voltage working condition can occur, and under the extreme condition, the voltage rapidly rises in a short time to generate an over-limit high voltage which is far higher than the national standard qualified limit value by +/-7 percent. The two high voltages can affect the user electric equipment, even burn out the user equipment, and the "out-of-limit high voltage" can also cause the system voltage to fluctuate greatly and damage greatly.
By using the overvoltage protection setting method, only the over-limit high voltage generated by the tripping of the switch due to the line fault can be cut off, the general high voltage generated by the normal internet access of the small hydropower station can not be cut off, and the misoperation of the small hydropower station is avoided.
As shown in fig. 2, to solve the above problem, the method for setting the overvoltage protection setting value of the generator according to the present invention includes the following steps:
s1: firstly, determining a setting value U of overvoltage protection of a transformer of a power grid where the generator is positionedg；
S2: setting the generator overvoltage protection setting value to k Ug(ii) a Where k is the motion coefficient.
Further improved, the overvoltage protection action coefficient is as follows: k is less than 1.
Further improved, the overvoltage protection action coefficient is as follows: k is 0.95.
Therefore, for the overvoltage generator, the generator trips before the voltage of the generator does not reach the overvoltage fixed value of the transformer, so that the generator is prevented from generating high voltage to cause overvoltage tripping of a plurality of transformers connected to the grid; after the generator trips, other generators can still generate power normally, and the power failure range is reduced.
The 'common high voltage' and the 'over-limit high voltage' can both cause the action of the overvoltage protection device of the small hydropower station to cause the small hydropower station to trip, and in the field operation, the high voltage generated by the tripping of the switch caused by the circuit fault is only needed to be cut off, and the common high voltage generated by the normal networking of the small hydropower station is not needed to be cut off.
The 'general high voltage' slowly rising during normal operation of the generator can not reach the overvoltage protection fixed value and can be adjusted in a voltage adjusting mode, and the overvoltage protection of the generator cannot malfunction; the 'over-limit high voltage' which rises rapidly under extreme conditions can reach an overvoltage protection setting value, so that the overvoltage protection of the generator acts correctly; after the overvoltage protection setting method is adopted by the generator, the protection of the generator and the transformer is selective, the power failure times and range are reduced, and the frequent grid-connected operation of the generator is reduced.
As shown in fig. 2, the method for setting the low voltage protection setting value of the generator of the present invention includes the following steps:
s1: firstly, determining a setting value U of low-voltage protection of a transformer of a power grid where the generator is positionedd；
S2: setting the generator low-voltage protection setting value to k 1Ud(ii) a Where k1 is an action coefficient.
Further improved, the low voltage protection action coefficient is: k1 > 1.
Further improved, the low voltage protection action coefficient is: k1 is 1.05.
Therefore, the low-voltage protection setting value of the generator is set to be larger than the over-voltage protection setting value of the transformer, and the generator with low voltage trips before the voltage of the generator reaches the low-voltage setting value of the transformer, so that the generator is prevented from generating low voltage of the system, and more voltage drops of the transformer and even trips are avoided; after the generator is tripped, other generators can still generate power normally, so that the power failure range is greatly reduced.
Claims (6)
1. A method for setting overvoltage protection of a generator is characterized by comprising the following steps: the method comprises the following steps:
s1: firstly, determining a setting value U of overvoltage protection of a transformer of a power grid where the generator is positionedg；
S2: setting the generator overvoltage protection setting value to k Ug(ii) a Where k is the motion coefficient.
2. The method for setting overvoltage protection of a generator according to claim 1, wherein the overvoltage protection action coefficient is: k is less than 1.
3. The setting method of generator overvoltage protection according to any one of claims 1-2, characterized in that the overvoltage protection action coefficient is: k is 0.95.
4. A method for setting a low voltage protection setting value of a generator is characterized by comprising the following steps: the method comprises the following steps:
s1: firstly, determining a setting value U of low-voltage protection of a transformer of a power grid where the generator is positionedd；
S2: setting the generator low-voltage protection setting value to k 1Ud(ii) a Where k1 is an action coefficient.
5. The method for setting generator low-voltage protection according to claim 4, wherein the low-voltage protection action coefficient is as follows: k1 > 1.
6. The setting value setting method for generator low voltage protection according to any one of claims 4-5, wherein the low voltage protection action coefficient is: k1 is 1.05.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110923701.2A CN113765060A (en) | 2021-08-05 | 2021-08-05 | Method for setting over-voltage protection and low-voltage protection values of generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110923701.2A CN113765060A (en) | 2021-08-05 | 2021-08-05 | Method for setting over-voltage protection and low-voltage protection values of generator |
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| CN113765060A true CN113765060A (en) | 2021-12-07 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2784323A (en) * | 1950-02-23 | 1957-03-05 | Bendix Aviat Corp | Overvoltage protective device |
| CN104242340A (en) * | 2014-09-10 | 2014-12-24 | 南京磐能电力科技股份有限公司 | Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode |
| CN109291913A (en) * | 2017-07-25 | 2019-02-01 | 郑州宇通客车股份有限公司 | A kind of voltage protection method under hybrid vehicle overspeed condition |
| CN109842101A (en) * | 2017-11-29 | 2019-06-04 | 中国电力科学研究院有限公司 | The over-voltage protection method and device of half-wavelength ac transmission dynamic simulator system |
| CN110579666A (en) * | 2019-10-14 | 2019-12-17 | 华自科技股份有限公司 | automatic test system for transformer relay protection equipment |
| CN213125593U (en) * | 2020-07-09 | 2021-05-04 | 广西电网有限责任公司桂林供电局 | Automatic switch for small hydropower line |
| CN113036771A (en) * | 2021-02-24 | 2021-06-25 | 国网浙江省电力有限公司 | Power grid stability improving method based on excitation system design margin |
-
2021
- 2021-08-05 CN CN202110923701.2A patent/CN113765060A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2784323A (en) * | 1950-02-23 | 1957-03-05 | Bendix Aviat Corp | Overvoltage protective device |
| CN104242340A (en) * | 2014-09-10 | 2014-12-24 | 南京磐能电力科技股份有限公司 | Stable control method in switching process from micro-grid non-planned grid connection operation mode to isolated island operation mode |
| CN109291913A (en) * | 2017-07-25 | 2019-02-01 | 郑州宇通客车股份有限公司 | A kind of voltage protection method under hybrid vehicle overspeed condition |
| CN109842101A (en) * | 2017-11-29 | 2019-06-04 | 中国电力科学研究院有限公司 | The over-voltage protection method and device of half-wavelength ac transmission dynamic simulator system |
| CN110579666A (en) * | 2019-10-14 | 2019-12-17 | 华自科技股份有限公司 | automatic test system for transformer relay protection equipment |
| CN213125593U (en) * | 2020-07-09 | 2021-05-04 | 广西电网有限责任公司桂林供电局 | Automatic switch for small hydropower line |
| CN113036771A (en) * | 2021-02-24 | 2021-06-25 | 国网浙江省电力有限公司 | Power grid stability improving method based on excitation system design margin |
Non-Patent Citations (1)
| Title |
|---|
| 安军;穆钢;郑太一;王明星;刘柏林;姜旭;: "改善电网电压水平的发电机励磁系统调差系数优化策略", 电力系统自动化, no. 23, 10 December 2013 (2013-12-10) * |
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