CN112701734A - AGC instruction intelligent distribution technology for whole plant of thermal power plant - Google Patents
AGC instruction intelligent distribution technology for whole plant of thermal power plant Download PDFInfo
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- CN112701734A CN112701734A CN202110084780.2A CN202110084780A CN112701734A CN 112701734 A CN112701734 A CN 112701734A CN 202110084780 A CN202110084780 A CN 202110084780A CN 112701734 A CN112701734 A CN 112701734A
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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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Abstract
The invention relates to the technical field of thermal power generation, in particular to a whole plant AGC instruction intelligent distribution technology of a thermal power plant, which comprises two switches, an engineer station and machine set DCS (distributed control systems), wherein a redundant annular Ethernet is formed by the two switches, a pair of controllers is arranged, the four machine set DCS are arranged, the real-time load, boiler MFT, generator grid-connected state, steam turbine hanging brake state, AGC input state and CCS input state information of each machine set DCS are respectively connected into an AGC instruction automatic distribution system, an AGC instruction of each machine set is calculated by the AGC instruction automatic distribution system according to the output size, performance, coal consumption and flexibility indexes of the machine set DCS, and is distributed to the unit machine set DCS, and the AGC instruction automatic distribution system comprises a plant level control mode and a plant level AGC mode. This thermal power factory AGC instruction intelligent allocation technique of making a whole factory has improved the flexibility of power plant to the AGC instruction response, full play unit efficiency, and extension overhaul of the equipments cycle reduces the unit load fluctuation, promotes the whole safety level of unit.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to an AGC instruction intelligent distribution technology for a whole plant of a thermal power plant.
Background
In the conventional concept, an electric network is taken as an initiator of load demand to directly distribute AGC to unit units, the distribution formula cannot better adapt to the requirement of the current power load flexibility, the construction condition of a multi-source cooperative control system (MEGC) main station and the initial assumption of upgrading an AGC sub-station to an MEGC sub-station are declared in a meeting of 'power plant network source coordination work' by adjusting in 21 Liaoning province in 11 and 21 months in 2019, the traditional AGC distribution mode is that the load demand is directly sent to a single unit, secondary frequency adjustment is carried out collectively along with the requirement of the electric network, AGC takes the plant level as a unit, the electric network only needs to distribute the demand and then carry out secondary frequency adjustment, therefore, an intelligent distribution technology of AGC instructions of a whole thermal power plant is designed, which is urgently needed in the technical field of thermal power generation at present,
disclosure of Invention
The invention provides an AGC instruction intelligent distribution technology for a whole plant of a thermal power plant, which aims to solve the problems in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
according to the embodiment of the invention, the intelligent distribution technology of AGC commands of a whole plant of a thermal power plant comprises two switches, two controllers, an operator station, an engineer station and a set DCS, wherein a redundant annular Ethernet is formed by the two switches, one pair of controllers is arranged, the four sets of sets DCS are arranged, the real-time load, the boiler MFT, the generator grid-connected state, the steam turbine hanging gate state, the AGC input state and the CCS input state information of each set of DCS are respectively connected into an AGC command automatic distribution system, the AGC command automatic distribution system calculates the AGC commands of each set of units according to the output power, performance, coal consumption and flexibility indexes of the sets of DCS and distributes the AGC commands to the set DCS, the AGC command automatic distribution system comprises a plant level control mode and a plant level AGC mode, a control station in the plant level control mode is a manual mode, the total load is issued by scheduling and is manually controlled by workers, and then the data is distributed to the unit DCS after being calculated by an AGC instruction automatic distribution system, a control station in a plant-level AGC mode directly receives, schedules and issues a load instruction in an automatic mode, and distributes the load instruction to the unit DCS after being calculated by the AGC instruction automatic distribution system, the plant-level control mode comprises two load distribution strategies of comprehensive coal consumption optimization and distribution according to a functional coefficient, the comprehensive coal consumption optimization considers economic indexes such as coal consumption of each unit DCS, the functional coefficient distribution considers the factors of unit rated output capacity proportion, load limitation, adjusted upper and lower limit capacity and deviation of each unit load instruction, wherein the model expression of load calculation is as follows:
Q＝f(fu,a1)
ai＝f(p,c)
wherein Q is an AGC instruction of the unit set, fu is the coal consumption of the unit set, P is the output of the unit set, a1And c is load deviation, automatically fitting a coal consumption characteristic curve of each unit DCS according to the coal consumption values of the four unit DCS at a plurality of load points, and calculating the most economical unit load distribution under each load section of the whole plant.
Further, the AGC command automatic distribution system has a load compensation function.
Furthermore, the automatic AGC instruction distribution system has an output limiting function, the automatic AGC instruction distribution system can prejudge whether the load instruction distributed to the unit set DCS is close to the load limitation of the unit set DCS in the AGC state, and the automatic AGC instruction distribution system can block instruction output when the limitation is reached.
Furthermore, the automatic AGC instruction distribution system has a manual intervention function, and provides a human-computer interface and a corresponding operation function for operators.
The invention has the following advantages:
the AGC instruction intelligent distribution technology for the whole thermal power plant improves the flexibility of the power plant for responding to AGC instructions, fully exerts the unit efficiency, prolongs the equipment maintenance period, reduces the unit load fluctuation, improves the overall safety level of the unit, combines the actual conditions of four units, comprehensively considers a series of factors such as coal consumption, load change rate, economic indexes, auxiliary equipment operation conditions and the like of each unit, intelligently and automatically distributes loads, enables the loads to be always in the optimal economic operation state under the current condition, and reduces the operation cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a schematic diagram of an automatic AGC command distribution system according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
The invention provides a technical scheme that:
an intelligent AGC instruction distribution technology for a whole plant of a thermal power plant comprises two switches, a controller, an operator station, an engineer station and a unit DCS, wherein the two switches form a redundant annular Ethernet mutually, the controller is a pair, the unit DCS is four, the real-time load, boiler MFT, generator grid-connected state, steam turbine hanging brake state, AGC input state and CCS input state information of each unit DCS are respectively connected into an AGC instruction automatic distribution system, the AGC instruction automatic distribution system calculates an AGC instruction of each unit according to the output power, performance, coal consumption and flexibility indexes of the unit DCS and distributes the AGC instruction to the unit DCS, the AGC instruction automatic distribution system comprises a plant-level control mode and a plant-level AGC mode, a control station in the plant-level control mode is in a manual mode, the total load is issued by scheduling, is manually controlled by a worker, and is distributed to the unit DCS after being calculated by the AGC instruction automatic distribution system, the plant-level AGC mode is characterized in that a control station is in an automatic mode, directly receives, dispatches and issues a load instruction, and distributes the load instruction to the unit DCS after being calculated by an AGC instruction automatic distribution system, the plant-level control mode comprises two load distribution strategies of comprehensive coal consumption optimization and distribution according to functional coefficients, the comprehensive coal consumption optimization considers economic indexes such as coal consumption of each unit DCS, the functional coefficient distribution considers the unit rated output capacity proportion, load limitation, adjusted upper and lower limit capacity and deviation factors of each unit load instruction, and a model expression of load calculation is as follows:
Q＝f(fu,a1)
ai＝f(p,c)
wherein Q is an AGC instruction of the unit set, fu is the coal consumption of the unit set, P is the output of the unit set, a1And c is load deviation, automatically fitting a coal consumption characteristic curve of each unit DCS according to the coal consumption values of the four unit DCS at a plurality of load points, and calculating the most economical unit load distribution under each load section of the whole plant.
In the invention: the automatic AGC instruction distribution system has a load compensation function, and can compensate the load difference to other sets of DCS under the condition that the load distribution of the automatic AGC instruction distribution system cannot be achieved in a manual intervention state or due to the set of DCS, so that the deviation of the total load cannot occur.
In the invention: the automatic AGC instruction distribution system has an output limiting function, pre-judges whether a load instruction distributed to the unit set DCS is close to the load limitation of the unit set DCS in an AGC state or not, and locks instruction output when the limitation is reached.
In the invention: the automatic AGC instruction distribution system has a manual intervention function, provides a human-computer interface and a corresponding operation function for operating personnel, generally does not need human intervention, but provides an interface for human intervention, allows the load of the unit DCS to be set manually, can operate at a fixed load for the unit DCS with poor load variation capacity, and allows the unit DCS with strong peak regulation capacity to respond to load variation.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (4)
1. The utility model provides a thermal power factory AGC instruction intelligence distribution technique, includes switch, controller, operator station, engineer station and unit DCS, its characterized in that: the system comprises two switches, a pair of controllers and four sets of unit DCS, wherein the real-time load, boiler MFT, generator grid-connected state, steam turbine hanging gate state, AGC input state and CCS input state information of each set of unit DCS are respectively accessed into an AGC instruction automatic distribution system, the AGC instruction automatic distribution system calculates an AGC instruction of each set according to the output size, performance, coal consumption and flexibility indexes of the set DCS and distributes the AGC instruction to the unit set DCS, the AGC instruction automatic distribution system comprises a plant level control mode and a plant level AGC mode, a control station in the plant level control mode is in a manual mode, the total load is issued by scheduling, is manually controlled by workers and is distributed to the set DCS after being calculated by the AGC instruction automatic distribution system, the control station in the plant level AGC mode is in an automatic mode and directly receives and issues a load scheduling instruction, the method comprises the steps that after calculation of an AGC instruction automatic distribution system, the AGC instruction automatic distribution system distributes the data to unit DCS, two load distribution strategies including comprehensive coal consumption optimization and distribution according to functional coefficients are adopted in a plant-level control mode, economic indexes such as coal consumption of each unit DCS are considered in the comprehensive coal consumption optimization, the functional coefficient distribution considers unit rated output capacity proportion, load limitation, adjusted upper and lower limit capacity and deviation factors of load instructions of each unit, and a model expression of load calculation is as follows:
Q＝f(fu,a1)
ai＝f(p,c)
wherein Q is the AGC command of the unit set, fu isCoal consumption of the unit, P is the output of the unit, a1And c is load deviation, automatically fitting a coal consumption characteristic curve of each unit DCS according to the coal consumption values of the four unit DCS at a plurality of load points, and calculating the most economical unit load distribution under each load section of the whole plant.
2. The intelligent AGC command distribution technology for the whole plant of a thermal power plant according to claim 1, characterized in that: the AGC command automatic distribution system has a load compensation function.
3. The intelligent AGC command distribution technology for the whole plant of a thermal power plant according to claim 1, characterized in that: the automatic AGC instruction distribution system has an output limiting function, pre-judges whether a load instruction distributed to the unit set DCS is close to the load limitation of the unit set DCS in an AGC state or not, and locks instruction output when the limitation is reached.
4. The intelligent AGC command distribution technology for the whole plant of a thermal power plant according to claim 1, characterized in that: the automatic AGC instruction distribution system has a manual intervention function, and provides a human-computer interface and a corresponding operation function for operating personnel.
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| CN202110084780.2A CN112701734A (en) | 2021-01-21 | 2021-01-21 | AGC instruction intelligent distribution technology for whole plant of thermal power plant |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197641A (en) * | 2013-03-27 | 2013-07-10 | 华北电力大学 | Heat-engine plant plant-level load and voltage integrated automatic control system |
| CN203708286U (en) * | 2013-10-22 | 2014-07-09 | 中国电力工程顾问集团西南电力设计院 | Main and auxiliary control integrated monitoring system of thermal power plate based on plant-level DCS network |
| CN105098843A (en) * | 2015-08-25 | 2015-11-25 | 南京南瑞继保电气有限公司 | Power plant level automatic power generation control system applied load optimizing and distributing method and system |
| CN108574304A (en) * | 2018-05-04 | 2018-09-25 | 华能国际电力股份有限公司海门电厂 | A kind of level of factory AGC load optimals logic control method and system |
-
2021
- 2021-01-21 CN CN202110084780.2A patent/CN112701734A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197641A (en) * | 2013-03-27 | 2013-07-10 | 华北电力大学 | Heat-engine plant plant-level load and voltage integrated automatic control system |
| CN203708286U (en) * | 2013-10-22 | 2014-07-09 | 中国电力工程顾问集团西南电力设计院 | Main and auxiliary control integrated monitoring system of thermal power plate based on plant-level DCS network |
| CN105098843A (en) * | 2015-08-25 | 2015-11-25 | 南京南瑞继保电气有限公司 | Power plant level automatic power generation control system applied load optimizing and distributing method and system |
| CN108574304A (en) * | 2018-05-04 | 2018-09-25 | 华能国际电力股份有限公司海门电厂 | A kind of level of factory AGC load optimals logic control method and system |
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