CN112415970A - Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction - Google Patents
Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction Download PDFInfo
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- CN112415970A CN112415970A CN202011320268.5A CN202011320268A CN112415970A CN 112415970 A CN112415970 A CN 112415970A CN 202011320268 A CN202011320268 A CN 202011320268A CN 112415970 A CN112415970 A CN 112415970A
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- 239000000446 fuel Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010248 power generation Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009699 differential effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41835—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by programme execution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Fuel Cell (AREA)
Abstract
The invention relates to a method for eliminating large-range fluctuation of fuel quantity caused by small-range change of an AGC instruction, which comprises the following steps: the unit load target value and the unit load set value are enabled to obtain the amplitude of the current variable load through the subtraction block, the obtained amplitude value is used for judging whether the load change amplitude is larger than 10MW through the height limit alarm function block, if so, the output result of the switching selection block is 1, and if not, the output result of the switching selection block is 0; and after the output result of the switching selection block and the original logic output are operated by a first multiplication block and a second multiplication block, the output result is output as a final result, wherein the output of the first multiplication block is used in a load-up process, and the output of the second multiplication block is used in a load-down process. The invention adds the logic for judging the change size of the load instruction, filters the load instruction with small amplitude change through the judgment result, does not influence the load instruction with large amplitude change, reduces the working intensity of operators, improves the efficiency of the unit and reduces the power generation cost.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a method for eliminating large-range fluctuation of fuel quantity caused by small-range change of an AGC (automatic gain control) instruction.
Background
The AGC mode is used as a main mode for the operation of the thermal power generating unit, a unit load instruction which is put into the AGC mode is given by power grid dispatching, the thermal power generating unit which operates in the AGC mode has certain requirements on the load change rate of the unit, and in order to meet the operation requirements of rapid peak regulation and frequency modulation of the power grid, when the unit receives a load lifting instruction, a coordination control system can overshoot add or reduce fuel quantity to achieve the purpose of rapid load lifting. When the instruction amplitude given by power grid dispatching is large, the control mode can well meet the operation requirement, when the instruction changes in a small range, the unit can meet the requirement only by means of heat storage and the like, and large-range fluctuation of fuel quantity can cause large-range fluctuation of unit parameters, and even can cause accidents such as non-stop of the unit or equipment damage.
Generally, when the load instruction fluctuates in a small range in an AGC mode, an operator can only perform manual intervention by means of reinforcing a monitoring disc, frequently adjusting control equipment and the like to prevent important parameters from exceeding the limit, so that the working strength of the operator is invisibly increased, the dynamic adjustment process of the unit is prolonged, the unit cannot stably operate under a rated working condition for a long time, the efficiency of the unit is reduced, and the power generation cost is increased.
Disclosure of Invention
The invention aims to provide a method for eliminating large-range fluctuation of fuel quantity caused by small-range change of an AGC (automatic gain control) instruction, which optimizes the existing coordination control logic of a unit, increases the logic for judging the change size of a load instruction, filters the load instruction with small-range change according to the judgment result and is not influenced by the load instruction with large-range change.
The invention provides a method for eliminating large-range fluctuation of fuel quantity caused by small-range change of an AGC instruction, which comprises the following steps:
adding a subtraction block, a high-low limit alarm function block, a switching selection block, a first multiplication block and a second multiplication block into the unit coordination control logic;
enabling the unit load target value and the unit load set value to pass through the subtraction block to obtain the amplitude of the current variable load, and enabling the obtained amplitude value to pass through the high-low limit alarm function block to judge whether the load change amplitude is larger than 10MW, wherein if the load change amplitude is larger than 10MW, the output result of the switching selection block is 1, and if the load change amplitude is not larger than 10MW, the output result of the switching selection block is 0;
and after the output result of the switching selection block and the original logic output are operated by a first multiplication block and a second multiplication block, the output result is output as a final result, wherein the output of the first multiplication block is used in a load-up process, and the output of the second multiplication block is used in a load-down process.
By means of the scheme, the logic for judging the change size of the load instruction is increased by eliminating the large-range fluctuation of the fuel quantity caused by the small-range change of the AGC instruction, the load instruction with small-range change is filtered through the judgment result, the load instruction with large-range change is not affected, the working intensity of operators is reduced, the efficiency of a unit is improved, and the power generation cost is reduced.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Drawings
FIG. 1 is a diagram of the existing coordinated control logic of a unit;
FIG. 2 is a diagram of the optimized coordinated control logic of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
When the unit in normal operation changes the load of about 10MW, the fuel quantity is not required to be overshot, the requirement of the load change rate can be met by utilizing the heat storage of a boiler and a normal adjusting mode, and the unit operates in an AGC mode, the small-amplitude load instruction change is mainly concentrated between 5MW and 10MW, so when the load instruction change amplitude is less than 10MW, the control logic of fuel quantity overshoot is shielded.
The original coordination control logic diagram of the unit is shown in fig. 1, when the unit is subjected to variable load, the fuel quantity is overshot by utilizing the differential action of the set value of the unit load, and when the small-amplitude load instruction changes, no limiting condition exists, and the fuel quantity is overshot in the variable load process. During the small-amplitude change of the load instruction, the overshoot fluctuates in a large range.
FIG. 2 is the optimized logic, the unit load target value and the unit load set value pass through a subtraction block 1 to obtain the amplitude of the current variable load, the obtained amplitude value passes through a high-low limit alarm function block 2 to judge whether the load change amplitude is greater than 10MW, if the load change amplitude is greater than 10MW, the output of a switching selection block 3 is 1, otherwise the output is 0, the output result of the switching selection block 3 is output as the final result after the operation of a multiplication block 4 with the original logic output, the output of the multiplication block 4 is used in the load-up process, the output of the multiplication block 5 is used in the load-down process, when the unit load instruction change amplitude is less than 10MW, no matter the overshoot fuel quantity in the load-up and down process is multiplied by a coefficient 0, the output result is also 0, after the above logic operation, when the load instruction small amplitude change can be solved, the problem of fuel quantity fluctuation.
Through the optimized control logic, the optimized control logic can effectively avoid the large-range fluctuation of the fuel quantity brought by the change of a small-amplitude load instruction, and the normal fuel quantity overshoot can be realized without any influence when the load instruction is changed greatly.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (1)
1. A method for eliminating wide fluctuation of fuel quantity caused by small range change of AGC instruction, comprising:
adding a subtraction block, a high-low limit alarm function block, a switching selection block, a first multiplication block and a second multiplication block into the unit coordination control logic;
enabling the unit load target value and the unit load set value to pass through the subtraction block to obtain the amplitude of the current variable load, and enabling the obtained amplitude value to pass through the high-low limit alarm function block to judge whether the load change amplitude is larger than 10MW, wherein if the load change amplitude is larger than 10MW, the output result of the switching selection block is 1, and if the load change amplitude is not larger than 10MW, the output result of the switching selection block is 0;
and after the output result of the switching selection block and the original logic output are operated by a first multiplication block and a second multiplication block, the output result is output as a final result, wherein the output of the first multiplication block is used in a load-up process, and the output of the second multiplication block is used in a load-down process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320268.5A CN112415970A (en) | 2020-11-23 | 2020-11-23 | Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011320268.5A CN112415970A (en) | 2020-11-23 | 2020-11-23 | Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction |
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| Publication Number | Publication Date |
|---|---|
| CN112415970A true CN112415970A (en) | 2021-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011320268.5A Pending CN112415970A (en) | 2020-11-23 | 2020-11-23 | Method for eliminating large-range fluctuation of fuel quantity caused by small-range change of AGC (automatic gain control) instruction |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070038335A1 (en) * | 2005-07-22 | 2007-02-15 | Mcintyre Timothy J | Real Power Regulation for the Utility Power Grid Via Responsive Loads |
| CN101598328A (en) * | 2008-09-28 | 2009-12-09 | 广州粤能电力科技开发有限公司 | The Steam Temperature for Boiler control method and the isolated plant of big rate of load change |
| CN101645599A (en) * | 2009-08-25 | 2010-02-10 | 广东电网公司电力科学研究院 | Pretreatment unit capable of automatically generating power to control target loads |
| CN105135409A (en) * | 2015-08-10 | 2015-12-09 | 国网山东省电力公司电力科学研究院 | Supercritical unit boiler master controller control method based on primary frequency modulation action amplitude |
| CN111255529A (en) * | 2020-03-19 | 2020-06-09 | 西安热工研究院有限公司 | Quick response automatic power generation control system and method for operation of heat supply cylinder switching unit |
-
2020
- 2020-11-23 CN CN202011320268.5A patent/CN112415970A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070038335A1 (en) * | 2005-07-22 | 2007-02-15 | Mcintyre Timothy J | Real Power Regulation for the Utility Power Grid Via Responsive Loads |
| CN101598328A (en) * | 2008-09-28 | 2009-12-09 | 广州粤能电力科技开发有限公司 | The Steam Temperature for Boiler control method and the isolated plant of big rate of load change |
| CN101645599A (en) * | 2009-08-25 | 2010-02-10 | 广东电网公司电力科学研究院 | Pretreatment unit capable of automatically generating power to control target loads |
| CN105135409A (en) * | 2015-08-10 | 2015-12-09 | 国网山东省电力公司电力科学研究院 | Supercritical unit boiler master controller control method based on primary frequency modulation action amplitude |
| CN111255529A (en) * | 2020-03-19 | 2020-06-09 | 西安热工研究院有限公司 | Quick response automatic power generation control system and method for operation of heat supply cylinder switching unit |
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Application publication date: 20210226 |