CN110970911B - Control method for mutual superposition of AGC and primary frequency modulation in opening degree mode - Google Patents
Control method for mutual superposition of AGC and primary frequency modulation in opening degree mode Download PDFInfo
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- CN110970911B CN110970911B CN201911283923.1A CN201911283923A CN110970911B CN 110970911 B CN110970911 B CN 110970911B CN 201911283923 A CN201911283923 A CN 201911283923A CN 110970911 B CN110970911 B CN 110970911B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000009471 action Effects 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract 1
- 238000010977 unit operation Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 5
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention discloses a control method for mutual superposition of AGC and primary frequency modulation in an opening degree mode, which comprises the following steps: adding a unit operation water purification head signal in a speed regulator control program; adding a primary frequency modulation power action quantity signal in a speed regulator control program and uploading the signal to a monitoring system; dividing n typical test water heads according to the actual operation water level of the power station; under each test water head, loading from no load to rated power, and recording the corresponding relation between the opening degree of the guide vane and the power; calculating the action quantity of the primary frequency modulation opening degree according to the frequency deviation by an internal program of the speed regulator; calculating the primary frequency modulation opening degree action quantity through a difference value to obtain a primary frequency modulation power action quantity, and uploading the primary frequency modulation power action quantity to a monitoring system; after the monitoring system is superposed, the guide vane opening degree is adjusted through PID calculation to maintain the frequency stability of the power grid; the invention solves the problem that AGC and primary frequency modulation can not be mutually superposed in the current opening degree mode, and is beneficial to the safe and stable operation of a unit and a power grid.
Description
Technical Field
The invention relates to the field of automatic control of hydropower stations, in particular to a control method for mutual superposition of AGC and primary frequency modulation in an opening mode.
Background
AGC (automatic generation control) is to track power system load changes by modifying the active output settings to control the generator active output. The primary frequency modulation is that the speed regulator makes a response quickly according to the deviation of the system frequency, and the opening degree of the guide vane is changed automatically according to the set difference modulation coefficient, so that the active power of the unit is changed to maintain the stability of the system frequency. In actual operation, the two methods are often contradictory because of the need of simultaneous adjustment or inconsistent adjustment directions.
Regarding the matching relation of the AGC and the AGC, the unit in the national power grid range executes primary frequency modulation first, most units in the past set the period of primary frequency modulation action, AGC negative modulation automatically quits, and AGC is put into operation again after the primary frequency modulation action is finished. In the period of primary frequency modulation action, AGC can not carry out load regulation, which is not beneficial to the safe and stable operation of the unit, in recent years, a new matching strategy of the primary frequency modulation and the power closed loop is provided, one strategy is that the primary frequency modulation and the power closed loop are mutually superposed to ensure that the primary frequency modulation and the power closed loop can be regulated at the same time, and the other strategy is that 'same-direction superposition and reverse locking' are adopted, namely if the active set value of the power closed loop is the same as the direction of the primary frequency modulation action, the two strategies are mutually superposed, if the action direction is opposite, the power closed loop is. The two modes are relatively reasonable, but the hydroelectric generating set mostly adopts an opening degree adjusting mode because the stable operation of the hydroelectric generating set is considered, if the hydroelectric generating set and the hydroelectric generating set are adjusted at the same time, the result can only be that once frequency modulation can be operated after AGC adjustment is finished, and at present, no better method is provided for realizing the mutual superposition of the action effects of the hydroelectric generating set and the hydroelectric generating set.
Disclosure of Invention
The invention aims to provide a method for mutually superposing AGC and primary frequency modulation in an opening degree mode, so that a hydroelectric generating set and the AGC and the primary frequency modulation can be coordinated and matched in the running process, and the stability of the frequency of a power grid is maintained.
In order to achieve the above object, the present application provides a method for controlling mutual superposition of AGC and primary frequency modulation in an opening mode, the method comprising:
the method comprises the following steps: increasing a real-time water purifying head signal of a unit in a speed regulator control program;
step two: adding a primary frequency modulation power action quantity signal in a speed regulator control program, and sending the signal to a computer monitoring system;
step three: dividing a plurality of test water heads according to the actual operating water level of the hydropower station;
step four, increasing the water-power generating unit from no load to rated load under each test water head, and obtaining the corresponding relation between the opening degree and the power of the water-power generating unit under the current water head;
step five, when the unit performs primary frequency modulation action, calculating through a program to obtain primary frequency modulation guide vane opening action quantity, and performing interpolation calculation through the water head-opening-power curve obtained in the step four to obtain primary frequency modulation power action quantity under the current water head and the current load;
step six: the primary frequency modulation power action amount is output to a computer monitoring system through AO, the monitoring system superposes the primary frequency modulation action amount and AGC, the superposed power set value is calculated through PID and output to the opening degree of a guide vane of a speed regulator, and therefore the effect of mutual superposition of AGC and primary frequency modulation in the opening degree mode is achieved.
One or more technical solutions provided by the present application have at least the following technical effects or advantages:
the invention solves the problem that primary frequency modulation and AGC are difficult to be mutually superposed and coordinated and matched in the opening degree mode of the hydroelectric generating set, obtains the primary frequency modulation power action quantity of the generating set through interpolation calculation and uploads the power action quantity to a monitoring system, realizes the mutual superposition of AGC and primary frequency modulation in the true sense, is beneficial to the generating set to quickly respond to the change of the power grid frequency, and maintains the stability of the system frequency. The calculation method can also be used for scheduling and checking the primary frequency modulation power contribution of the unit, solves the problem that the primary frequency modulation contribution of the unit is difficult to accurately quantify in the opening degree mode, and is particularly suitable for power stations with large upstream reservoir operation water level changes.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a flow chart of an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflicting with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1, a control method for overlapping AGC (automatic generation control) and primary frequency modulation in an opening mode of a governor may be implemented as follows:
1) and increasing a real-time water purifying head signal of the unit in a speed regulator control program.
2) A primary frequency modulation power action quantity signal is added in a speed regulator control program and is sent to a monitoring system through AO output.
3) The corresponding relation parameter group of the opening degree of the guide vane under n water heads and the active power is added in a control program of the speed regulator, and the corresponding relation parameter group can be modified in real time according to the actual running condition of the unit.
4) Dividing n test water heads such as a maximum water head, a rated water head, a minimum water head and the like according to the actual operating water level of the power station. And gradually increasing the unit from no load to rated load under each test water head to obtain the corresponding relation between the opening degree and the power under the current water head, and then storing the corresponding relation to the speed regulator.
5) When the unit performs primary frequency modulation action, the internal program of the speed regulator calculates to obtain the action quantity of the frequency modulation opening degree, and the current water head and the current load next frequency modulation power action quantity are obtained through interpolation calculation according to the water head value acquired in real time and a water head-opening degree-power curve stored in the speed regulator.
6) The primary frequency modulation power action amount is output through an AO and sent to a monitoring system to be superposed, the guide vane opening degree of the unit is controlled through PID operation, the active output of the unit is finally controlled, and the mutual superposition of primary frequency modulation and AGC is realized.
7) And finishing the frequency modulation action of the current time, and repeating the step five when the frequency modulation action of the next time is finished.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A control method for mutual superposition of AGC and primary frequency modulation in an opening degree mode is characterized by comprising the following steps:
the method comprises the following steps: increasing a real-time water purifying head signal of a unit in a speed regulator control program;
step two: adding a primary frequency modulation power action quantity signal in a speed regulator control program, and sending the primary frequency modulation power action quantity signal to a computer monitoring system;
step three: dividing a plurality of test water heads according to the actual operating water level of the hydropower station;
increasing the water-power generating unit from no-load to rated load under each test water head to obtain the corresponding relation between the opening degree and the power of the unit under the test water head;
step five, acquiring the opening action quantity of the primary frequency modulation guide vane of the speed regulator, and carrying out interpolation calculation on the water head-opening-power curve acquired in the step four to obtain the primary frequency modulation power action quantity under the current water head and the current load;
step six: and outputting the primary frequency modulation power action quantity obtained in the fifth step to a computer monitoring system through AO, superposing the primary frequency modulation power action quantity and AGC by the computer monitoring system, and outputting the superposed power given value to the opening degree of the control guide vane of the speed regulator through PID calculation.
2. The AGC and primary frequency modulation control method in an opening degree mode according to claim 1, characterized in that n test water heads such as a maximum water head, an intermediate water head 1, a rated water head, an intermediate water head 2 … and a minimum water head are divided according to the actual operating water level of the hydropower station.
3. The AGC and primary frequency modulation mutual superposition control method in the opening degree mode according to claim 1, characterized in that the corresponding relation between the opening degree and the power of the hydroelectric generating set under the current water head is obtained by increasing the hydroelectric generating set from no load to rated load under each test water head.
4. The AGC and primary frequency modulation mutual superposition control method in the opening degree mode according to claim 1, characterized in that the opening degree action quantity of the primary frequency modulation guide vane is obtained according to the size of the power grid frequency, the frequency dead zone set by the hydroelectric generating set and the slip coefficient.
5. The method for controlling the mutual superposition of AGC and primary frequency modulation in an opening degree mode according to claim 1, characterized in that a computer monitoring system superposes a primary frequency modulation power action quantity and an AGC set value, and the superposed power set value is output to the opening degree of a control guide vane of a speed regulator through PID calculation.
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| CN111668857B (en) * | 2020-04-30 | 2022-07-01 | 中国电力科学研究院有限公司 | Method and system for primary frequency modulation of hydropower station generator monitoring system |
| CN112072675A (en) * | 2020-07-23 | 2020-12-11 | 国网江西省电力有限公司电力科学研究院 | Hydroelectric generating set primary and secondary frequency modulation cooperative control method |
| CN112348305A (en) * | 2020-09-02 | 2021-02-09 | 大唐水电科学技术研究院有限公司 | Method and device for back calculating water head of hydraulic power plant |
| CN112290563A (en) * | 2020-09-16 | 2021-01-29 | 大唐水电科学技术研究院有限公司 | AGC logic superposition method for primary frequency modulation and monitoring system |
| CN112583056A (en) * | 2020-11-09 | 2021-03-30 | 中国长江电力股份有限公司 | Power plant AGC and primary frequency modulation cooperation control system and method in opening degree mode |
| CN112383254B (en) * | 2020-12-07 | 2022-03-15 | 中国长江电力股份有限公司 | Guide vane opening degree analog quantity segmentation open-loop control method and system |
| CN112736934B (en) * | 2020-12-23 | 2023-03-28 | 贵州电网有限责任公司 | Primary frequency modulation and AGC superposition control method in hydroelectric generating set opening mode |
| CN113013897B (en) * | 2021-03-09 | 2023-01-06 | 国网四川综合能源服务有限公司四川电力工程分公司 | Mechanical dead zone compensation method and device for guide vane of hydroelectric generating set |
| CN114156911A (en) * | 2021-11-25 | 2022-03-08 | 贵州电网有限责任公司 | Primary frequency modulation performance optimization method under hydroelectric generating set opening degree mode |
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| US9880576B2 (en) * | 2012-12-07 | 2018-01-30 | Battelle Memorial Institute | Direct load control frequency regulation support system |
| CN103853881A (en) * | 2014-02-12 | 2014-06-11 | 四川大学 | Water turbine parameter identification method based on self-adaptive chaotic and differential evolution particle swarm optimization |
| CN104503228B (en) * | 2014-11-19 | 2017-02-08 | 国家电网公司 | Primary frequency modulation stability domain determination method of water turbine speed regulator under power mode |
| CN105589455B (en) * | 2016-01-14 | 2018-03-06 | 国网新疆电力公司电力科学研究院 | A kind of machine net based on the access of Large Copacity multivariate data coordinates system |
| CN107061132B (en) * | 2016-12-15 | 2019-07-09 | 贵州北盘江电力股份有限公司董箐发电厂 | A kind of power station governor power closed-loop adjustment improves the regulating system of power regulation speed and degree of regulation |
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