CN113922331B - Generator reverse power protection action method, protection terminal and storage medium - Google Patents

Generator reverse power protection action method, protection terminal and storage medium Download PDF

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Publication number
CN113922331B
CN113922331B CN202111518593.7A CN202111518593A CN113922331B CN 113922331 B CN113922331 B CN 113922331B CN 202111518593 A CN202111518593 A CN 202111518593A CN 113922331 B CN113922331 B CN 113922331B
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reverse power
protection
generator
value
absolute value
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CN113922331A (en
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贾龙飞
周鹏
于国栋
康健悦
温常富
张相忠
巩文厚
魏中华
户宝玉
邵帅
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Ccdi Zunhua Thermal Power Co ltd
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Ccdi Zunhua Thermal Power Co ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The application relates to a generator reverse power protection action method and protectionA terminal and a storage medium, wherein the method comprises: acquiring output voltage and output current of the generator, and judging whether the generator outputs reverse power or not according to the output voltage and the output current; if so, acquiring a power factor angle phi of the reverse power according to the output voltage and the output current; judging whether the absolute value of the power factor angle phi and the absolute value of the difference value of the 90-degree angle are larger than or equal to 0 degree and smaller than 5 degrees or not; if yes, determining an action return coefficient Y of the protection terminal according to a preset first linear relation1Between 50% and 80%; if not, determining the action return coefficient Y of the protection terminal according to the preset second linear relation2Between 80% and 95%; according to the return coefficient Y1Or Y2And calculating a return value of the reverse power protection according to the preset reverse power protection setting value. The method and the device have the effect of improving the reliability of the program reverse power protection action of the generator.

Description

Generator reverse power protection action method, protection terminal and storage medium
Technical Field
The present disclosure relates to the field of power generation technologies, and in particular, to a generator reverse power protection method, a protection terminal, and a storage medium.
Background
The reverse power protection of the generator is also called power direction protection. Normally, the power direction of the generator should be from the generator to the bus bar to provide power to the power system, but when the generator is demagnetized or loses motive power for some other reason, the generator becomes a motor to run, i.e. active power is drawn from the power system, which is reverse power.
Currently, most protection terminals adopt 95% -98% of a reverse power threshold value as a protection action return value (the return value refers to the maximum/minimum value of an input excitation amount required by the protection terminal to return from an action state to a door initial state). Since the influence on the active power collection is most obvious when the power factor angle phi is about 90 degrees or 270 degrees, it is obvious that the slight sampling error causes the change of the power factor angle phi to react to the calculated value of the active power, for example: when the power factor angle phi is different from 0 degrees or 180 degrees by 1 degree, the corresponding active power error is 0.015 percent; if the power factor angle phi is different from 90 DEG or 270 DEG by 1 DEG, the corresponding active power error is 1.745%. When the acquired active power error is large, the reverse power protection or program reverse power protection may finally shake back and forth near the action value threshold of the protection terminal, so that the protection terminal cannot act correctly.
Disclosure of Invention
In order to improve the reliability of the generator program reverse power protection action, the application provides a generator reverse power protection action method, a protection terminal and a storage medium.
In a first aspect, the present application provides a generator reverse power protection action method, which adopts the following technical scheme:
a generator reverse power protection action method comprises the following steps:
acquiring output voltage and output current of the generator, and judging whether the generator outputs reverse power or not according to the output voltage and the output current;
if so, acquiring a power factor angle phi of the reverse power according to the output voltage and the output current;
judging whether the absolute value of the power factor angle phi and the absolute value of the difference value of the 90-degree angle are larger than or equal to 0 degree and smaller than 5 degrees or not;
if yes, determining a protection terminal according to a preset first linear relationCoefficient of motion return of terminal Y1Between 50% and 80%;
if not, determining the action return coefficient Y of the protection terminal according to the preset second linear relation2Between 80% and 95%;
according to the return coefficient Y1Or Y2And calculating a return value of the reverse power protection according to the preset reverse power protection setting value.
Optionally, the first linear relationship includes the following relationship:
X1[（0.8-0.5）/5°]+0.5=Y1
wherein, X1The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is1The return coefficient of reverse power protection is more than or equal to X at 0 degree1＜5°。
Optionally, the second linear relationship includes the following relationship:
X2[（0.95-0.8）/5°]+0.8=Y2
wherein, X2The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is2The return coefficient of reverse power protection is more than or equal to X at 5 degrees2＜10°。
In a second aspect, the present application provides a generator protection terminal, including:
one or more memories for storing instructions; and
one or more processors configured to invoke and execute the instructions from the memory to perform the method according to any one of the first aspect.
In a third aspect, the present application provides a computer-readable storage medium comprising:
a program for performing the method according to any one of the first aspect when the program is executed by a processor.
To sum up, the application comprises the following beneficial technical effects:
according to the power factor angle phi and the corresponding linear relation, the action return coefficient of the protection terminal is determined, the action return value of the protection terminal can be in a proper interval range, the protection terminal is guaranteed to be more stable in action tripping and action return, and the phenomenon that the protection terminal jumps back and forth between tripping and return to cause jitter is reduced.
Drawings
Fig. 1 is a flow chart of a method provided in an embodiment of the present application.
Fig. 2 is a schematic diagram of a first linear relationship and a second linear relationship in a coordinate system provided in an embodiment of the present application.
Detailed Description
First, a simple introduction is made to the reverse power protection of the transmitter. The reverse power protection is one of generator protection, and is used as protection for the reverse transmission of active power of a turbonator and the change of the generator into an abnormal working condition of motor operation. When the generator operates as a motor, active power is absorbed from a power system to drag the turbine to rotate, the turbine maintenance blades and residual steam generate friction to form blast loss, and the blades are damaged due to overheating after long-term operation.
The program reverse power protection is usually used as a shutdown mode of the generator, namely, a main steam valve of a steam turbine is closed, and the main circuit breaker between the generator and a transformer can be tripped when the reverse power reaches a set value. The program reverse power protection is used for preventing the overspeed operation of the steam turbine caused by the incomplete closing of the main throttle valve after the generator set is disconnected suddenly, so as to cause a runaway accident.
The technical solutions in the present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application discloses a method for improving the program reverse power protection reliability of a generator. Referring to fig. 1, the method includes the following steps.
Step 100: and acquiring the output voltage and the output current of the generator, and judging whether the generator outputs reverse power according to the output voltage and the output current.
Step 110: and if so, acquiring a power factor angle phi of the reverse power according to the output voltage and the output current.
Step 120: if not, the operation is not executed.
The mode of collecting the output voltage of the generator can be collected through a voltage transformer, and the mode of collecting the output current of the generator can be collected through a current transformer. The voltage transformer can convert high voltage output by the generator into low voltage which can be borne and identified by electronic equipment, and is usually connected to a primary circuit to be detected in parallel; the current transformer can convert a strong current output by the generator into a weak current which can be borne and identified by electronic equipment, and is usually connected in series to a primary circuit to be detected.
Step 200: and judging whether the absolute value of the difference between the absolute value of the power factor angle phi and the 90-degree angle is greater than or equal to 0 and smaller than 5 degrees or not.
Step 210: if yes, determining an action return coefficient Y of the protection terminal according to a preset first linear relation1Between 50% and 80%.
Step 220: if not, determining the action return coefficient Y of the protection terminal according to the preset second linear relation2Between 80% and 95%.
Wherein the first linear relationship comprises the following relationship:
X1[（0.8-0.5）/5°]+0.5=Y1
in the above relation, X1The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is1The return coefficient of reverse power protection is more than or equal to X at 0 degree1＜5°。
The second linear relationship includes the following relationship:
X2[（0.95-0.8）/5°]+0.8=Y2
in the above relation, X2The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is2The return coefficient of reverse power protection is more than or equal to X at 5 degrees2＜10°。
The schematic of the first linear relationship and the second linear relationship in the coordinate system is shown in fig. 2.
Step 300: according to the return coefficient Y1Or Y2And calculating a return value of the reverse power protection according to the set reverse power protection setting value.
And the return value of the reverse power protection is the product of the return coefficient and the reverse power setting value.
For example: the inverse power is customized to be-5W, the line voltage is 100V, the line current is 1A, and the sampling power factor angle error is +/-0.5 degrees. According to the above conditions, if the power is less than-5W, the theoretical power factor angle phi can be calculated as: 100 × 1 × 1.732 × COS Φ = -5W, Φ =91.66 °, and if the actual power factor angle Φ =91.7, the calculated active power P is-5.138W, in this case, the protection terminal reliably operates. Only considering the power factor angle phi error without considering the current and voltage sampling amplitude zero drift as follows: plus or minus 0.5 degrees, the sampling value of the power factor angle phi at the moment is 91.2 to 92.2 degrees, the active power calculated by the sampling value is-3.627 to-6.649W, and if the reverse power protection return value is calculated according to a 95% fixed value, the reverse power protection return threshold is as follows: -5 x 95% = -4.75W protection is to be returned when active power is greater than-4.75W. According to the situation, the device actually calculates the active power to be-3.627W-6.649W, and the action value and the return value of the reverse power protection are both in the range of the calculated active error, so that the return value will shake back and forth around an action threshold if the reverse power protection is calculated according to a constant value of 95%.
According to the step 200, after the inverse power protection return value is linearly adjusted, when the actual sampling power factor angle phi is 91.2 degrees, the inverse power protection return coefficient is as follows:
[(0.8-0.5)/5°]*(91.2°-90°)+0.5=57.2%
when the actual sampling power factor angle phi is 92.2 degrees, the reverse power protection return coefficient is as follows:
[(0.8-0.5)/5°]*(92.2°-90°)+0.5=63.2%
according to the return coefficients, the return values of the reverse power protection within the error range can be calculated to be-2.86W and-3.16W respectively, and the sampling values are smaller than the return values under the condition, so that the protection cannot be returned due to the sampling error of the power factor angle phi under the condition, the protection terminal can reliably act, the generator can be shut down smoothly, and the reliability of the reverse power protection of the generator is improved.
The embodiment of the application also discloses a generator protection terminal, which comprises one or more memories for storing instructions; and one or more processors configured to retrieve and execute the instructions from the memory, and to execute any of the computer programs in the preceding method steps.
The embodiment of the application also discloses a computer readable storage medium, which comprises: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk. The computer-readable storage medium stores a program that when executed by a processor, performs any of the aforementioned document approval methods.
The above embodiments are only used to describe the technical solutions of the present application in detail, but the above embodiments are only used to help understanding the method and the core idea of the present application, and should not be construed as limiting the present application. Those skilled in the art should also appreciate that various modifications and substitutions can be made without departing from the scope of the present disclosure.

Claims (3)

1. A generator reverse power protection action method is characterized by comprising the following steps:
acquiring output voltage and output current of the generator, and judging whether the generator outputs reverse power or not according to the output voltage and the output current;
if so, acquiring a power factor angle phi of the reverse power according to the output voltage and the output current;
judging whether the absolute value of the power factor angle phi and the absolute value of the difference value of the 90-degree angle are larger than or equal to 0 degree and smaller than 5 degrees or not;
if yes, determining an action return coefficient Y of the protection terminal according to a preset first linear relation1Between 50% and 80%; the first linear relationship comprises the following relationship:
X1[（0.8-0.5）/5°]+0.5=Y1
wherein, X1The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is1For reverse power protectionThe return coefficient is less than or equal to X of 0 DEG1＜5°；
If not, determining the action return coefficient Y of the protection terminal according to the preset second linear relation2Between 80% and 95%; the second linear relationship comprises the following relationship:
X2[（0.95-0.8）/5°]+0.8=Y2
wherein, X2The absolute value of the power factor angle phi and the absolute value of the difference value of the 90 degrees; y is2The return coefficient of reverse power protection is more than or equal to X at 5 degrees2＜10°；
According to the return coefficient Y1Or Y2And calculating a return value of the reverse power protection according to the preset reverse power protection setting value.
2. A generator protection terminal, comprising:
one or more memories for storing instructions; and
one or more processors configured to retrieve and execute the instructions from the memory, and to perform the method recited in claim 1.
3. A computer-readable storage medium characterized by: the computer-readable storage medium includes:
program for performing the method as claimed in claim 1 when the program is run by a processor.
CN202111518593.7A 2021-12-14 2021-12-14 Generator reverse power protection action method, protection terminal and storage medium Active CN113922331B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106533290A (en) * 2016-11-24 2017-03-22 华北电力科学研究院有限责任公司 Stator current limiting method and apparatus for generator automatic voltage regulator
CN106532773A (en) * 2016-12-06 2017-03-22 国网浙江省电力公司 Reverse power protection system of ship shore power system

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CN201742106U (en) * 2010-07-06 2011-02-09 西东控制集团（沈阳）有限公司 Inverse power prediction control device
CN102868175B (en) * 2012-09-12 2015-09-02 南车株洲电力机车研究所有限公司 A kind of reverse power protection method and distributed generation system
CN106099858B (en) * 2016-05-23 2018-06-29 国电南瑞科技股份有限公司 A kind of method for improving reverse-power in the generator protection precision
CN109861299A (en) * 2019-04-22 2019-06-07 协鑫能源工程有限公司 Anti- inverse probability autocontrol method, device and grid-connected power generation system
CN111725778B (en) * 2020-05-27 2022-03-11 湖南省湘电试验研究院有限公司 Line protection CT disconnection locking method, system and medium under condition of reversed trend

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106533290A (en) * 2016-11-24 2017-03-22 华北电力科学研究院有限责任公司 Stator current limiting method and apparatus for generator automatic voltage regulator
CN106532773A (en) * 2016-12-06 2017-03-22 国网浙江省电力公司 Reverse power protection system of ship shore power system

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