CN110690711A - Unit load instruction logic regulation and control method based on AGC mode - Google Patents
Unit load instruction logic regulation and control method based on AGC mode Download PDFInfo
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- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 2
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention discloses a unit load instruction logic regulation and control method based on an AGC mode, which comprises the steps of firstly, adding an AGC instruction ascending/descending direction judgment loop in a load control loop of a coordinated control system; secondly, adding a deviation value calculation loop and a deviation value and preset deviation limit value judgment loop in a load control loop of the coordinated control system; adding a tracking and switching loop and an input basic condition judgment loop of the tracking and switching loop; analyzing the AGC instruction value change stage from the DCS historical data of the unit, inquiring the AGC instruction value, the load instruction value of the unit and the running data of the actual load of the unit, and presetting control logic parameters; and (4) putting the coordination control system into actual operation, and resetting parameters until the control requirements are met after analyzing data according to the effect. The unit load instruction generation functional module is directly optimized, the actual time for the unit load instruction to respond to the AGC instruction is shortened, and the unit load response performance and the load change rate are obviously improved.
Description
Technical Field
The invention belongs to the technical field of coordinated control of a thermal generator set, and particularly relates to a set load instruction logic regulation and control method based on an AGC mode.
Background
The thermal power generating unit coordinated control system is a highest-level controller in unit control and is responsible for processing AGC load instructions or operator set instructions of an electric power regulation and control center, generating actual load instructions of the units which meet the unit capacity and can be accepted by safe operation, coordinating energy balance between a steam turbine and a boiler, ensuring that the units supply power to a power grid quickly, safely and stably, and maintaining safe and stable operation of the power grid. Because the coordinated control controlled object is a multi-input multi-output system, the coordinated control controlled object has the characteristics of nonlinearity, slow parameter time change, large delay and large inertia, and thus, a plurality of difficulties are brought to the design and implementation of the control system. The AGC command sent by the power grid control center is not responded in time, and the load change rate of the unit cannot meet the power grid requirement.
The common feature of the existing patent documents is that the amount of feedforward or pre-addition (subtraction) is increased in the optimization of a control link after a coordinated control system generates a unit load instruction, the unit load response rate is improved by relying on control links such as wind, coal and water, so that boiler control and steam turbine control are matched to achieve an energy balance system, the inertia time of boiler control is reduced, the control target is realized by an instruction feedforward method, and the core content of the control method is the combination of feedforward instruction coarse adjustment and feedback PID control fine adjustment. In the methods, the operation mechanism of the traditional unit load instruction generation algorithm is not researched and an optimization control method is not provided, and the schemes have the defects that the establishment of a mathematical model is difficult, the parameter setting process is complicated, and the optimization effect on the AGC response rate depends on the level of engineering technicians and the performance limit of a unit equipment system.
The control logic of the traditional unit load instruction generation algorithm has some defects on complex operation conditions: when the AGC instruction value is larger than or equal to the unit load instruction value and the unit load instruction value is larger than the actual load of the unit, the power grid AGC instruction is reduced, the unit load instruction is reduced at a set speed, and the actual load of the unit is in a rising trend. There is a difference between the unit load command and the unit actual load, and the change to the descending direction can only be made when the unit load command is reduced to intersect with the unit actual load. And vice versa. Due to the deficiency, after the power grid AGC load increasing and decreasing instruction is sent, the actual load of the generator set is not immediately increased or decreased, the actual load at the beginning stage changes in the opposite direction, the requirement of quick response of AGC load change under all working conditions is not met, and the operation condition is as shown in figure 1.
Disclosure of Invention
The invention aims to provide a unit load instruction logic regulation and control method based on an AGC mode, which has the characteristics of reducing the unit load instruction response time, improving the unit load dynamic response speed and achieving the effect of optimizing the unit load dynamic response.
The technical scheme adopted by the invention is a unit load instruction logic regulation and control method based on an AGC mode, which is implemented according to the following steps:
and 7, putting the coordination control system into actual operation, checking the control effect according to the operation curve, and resetting the parameters after analyzing data according to the effect until the control requirements are met.
The invention is also characterized in that:
The deviation value calculation circuit in the step 2 and the step 3, and the deviation value and preset deviation limit value judgment circuit are #7 functional blocks; after the #7 function block obtains the deviation value through the 3 subtraction blocks, the judgment of the deviation value and the preset deviation limit value is carried out by the high value judgment and the low value judgment.
The preset deviation limit value is a value set according to the rated power of the unit, is the rated power multiplied by 0.5-1%, and is set according to the time 20-40 seconds required by the unit to lift and lower 0.5-1% of the rated power load.
And 4, tracking and switching a loop, namely a #5 functional block, comprehensively judging after receiving signals of other loops, and switching the AGC command.
The invention has the beneficial effects that: the regulation and control method has the functions of real-time monitoring, judgment and tracking switching from the AGC instruction to the generator set, directly optimizes the generator set load instruction generating function module, reduces the actual time for the generator set load instruction to respond to the AGC instruction, and obviously improves the generator set load response performance and the load change rate.
Drawings
FIG. 1 is a graph of a unit operating under control logic of a conventional unit load command algorithm;
FIG. 2 is an algorithm block diagram of the unit load instruction logic regulation method based on the AGC mode;
FIG. 3 is a block diagram of a #1 functional block of the unit load instruction logic regulation method based on an AGC mode according to the present invention;
FIG. 4 is a block diagram of a #2 functional block of the unit load instruction logic control method based on the AGC scheme of the present invention;
FIG. 5 is a block diagram of the #3 functional block of the unit load instruction logic control method based on the AGC scheme of the present invention;
FIG. 6 is a block diagram of a #4 functional block of the unit load instruction logic control method based on the AGC scheme of the present invention;
FIG. 7 is a block diagram of a #5 functional block of the AGC based logic regulation method for the unit load instruction of the present invention;
FIG. 8 is a block diagram of a #7 functional block of the AGC based logic regulation method for the unit load instructions;
FIG. 9 is a block diagram of a #6 functional block of the AGC based logic regulation method for the unit load instruction of the present invention;
FIG. 10 is a block diagram of the #8 functional block of the unit load instruction logic control method based on the AGC scheme of the present invention;
FIG. 11 is a block diagram of the present invention based on the AGC model of the machine set load instruction logic control method;
FIG. 12 is a graph illustrating the descending operation of the unit load command logic control method based on the AGC scheme according to the present invention;
fig. 13 is a rising operation curve diagram of the unit load instruction logic control method based on the AGC mode.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a unit load instruction logic regulation and control method based on an AGC mode, which is implemented according to the following steps as shown in figure 2:
and 7, putting the coordination control system into actual operation, checking the control effect according to the operation curve, and resetting the parameters after analyzing data according to the effect until the control requirements are met.
As shown in fig. 9, the AGC instruction ascending/descending direction determination loop in step 1 is a #6 functional block; the up-down direction of the AGC instruction is determined by the subtraction block and the high value judgment and the low value judgment in the #6 function block.
As shown in fig. 8, the deviation value calculation loop, the deviation value and preset deviation limit value determination loop in step 2 and step 3 are #7 function blocks; the quantity value of the #7 functional block comprises an AGC instruction value, a unit load instruction value and a unit actual power value; after the #7 function block obtains the deviation value through the 3 subtraction blocks, the judgment of the deviation value and the preset deviation limit value is carried out by the high value judgment and the low value judgment.
The preset deviation limit value is a numerical value set according to the rated power of the unit, is the rated power multiplied by 0.5% -1%, and is set according to the time 20-40 seconds required by the unit to lift and lower 0.5% -1% of the rated power load, so that the time which can be reduced by a new algorithm is at least 20-40 seconds.
As shown in fig. 7, in step 4, the tracking and switching loop is the #5 functional block, and after receiving signals of other loops, the other loops including the #6 functional block, the #7 functional block, and the #8 functional block switch the AGC command.
As shown in fig. 10, the basic condition of step 5 is that the unit is in AGC mode and in coordination control mode; and a basic condition judgment loop is a #8 functional block and comprises a switching value functional block, an analog value functional block and a T switching station, and the load rate of the unit is obtained.
As shown in fig. 3-6, step 6 is performed by the #1-4 function block, the #1 function block with manual auto block, automatically determining whether to accept AGC commands; a #2 functional block with a T switching station, which judges whether to accept the AGC instruction value according to the state of the unit equipment; a #3 function block with a high-low limit block for receiving AGC command value to perform high limit and low limit to prevent overrun; the #4 functional block is provided with a T switching station, and ensures that the unit does not accept AGC and accepts an RB target instruction value under the RB working condition.
The main constraint conditions of the #1-4 function block comprise bearing capacity of a unit high-pressure regulating valve, air supply, negative pressure and water supply for quickly switching a unit load instruction to an actual load amplitude value of the unit, and influence of load instruction variables on output and operation modes of auxiliary equipment such as a coal mill, a coal feeder, an air feeder, an induced draft fan, a water supply pump and the like.
As shown in fig. 11, the network modem sends "AGC command" to automatically determine whether to accept the AGC command value through the #1 functional block, the T-switch station of the #2 functional block determines whether to accept the AGC command value according to the state of the unit equipment, and the high-low limiting block of the #3 functional block performs high limitation and low limitation on the received AGC command value to prevent overrun; the T switching station of the #4 functional block ensures that the unit does not receive AGC under the RB working condition and receives an RB target instruction value (when the RB working condition is an important auxiliary machine fault, a program automatically controls the unit to determine the load adding and reducing directions according to the load of the unit capable of generating power under the safe operation condition under the auxiliary machine fault state) network modulation AGC instruction value, and determines AGC load adding or load reducing directions through the subtraction block, high value judgment and low value judgment of the #6 functional block; the method comprises the steps that an AGC instruction value, an instruction value of the unit in running and an actual load value of the current unit are obtained through 3 subtraction blocks of a #7 functional block and then are compared with a set value, and the deviation value and a preset deviation limit value are judged through high value judgment and low value judgment to obtain an allowable rate condition; the #8 function block receives the allowable rate condition calculated by the #7 function block, generates a load rate and provides the allowable load rate of unit load change for the #5 function block; the #5 functional block load instruction switching station (receives the #6 functional block, #7 functional block, and #8 functional block and then performs comprehensive judgment) generates a unit load instruction "LDC output" value.
In the operation curve chart of the invention, "unit load" is the actual load measurement value of the unit, "AGC instruction" unit load instruction sent by the power grid regulation and control, "LDC output" is the unit load instruction value signal.
Example (b): the following is an example of a 660MW supercritical DC:
the unit overview is that the coal-fired condensing steam type unit comprises a unit main machine device: boilers, steam turbines, and generators.
The boiler is a supercritical parameter variable-pressure operation spiral tube ring direct-current furnace, and has a single-hearth, single-intermediate reheating, balanced ventilation, four-corner tangential circle, п -type open-air arrangement, solid dry slag discharge and all-steel-frame suspension structure.
The steam turbine is a supercritical, single-shaft, single-intermediate reheating, three-cylinder four-steam-discharge and Haylor indirect air-cooling condensing steam turbine; the model of the steam turbine is as follows: NJK660-24.2/566/566, the machine set is provided with seven sections of regenerative steam extraction, and 3 high-pressure heaters, 1 deaerator and 3 low-pressure heaters are supplied in sequence. The control system adopts an EDPF-NT + decentralized control system.
The regulation and control method of the invention is adopted to operate:
taking AGC load reduction as an example, an AGC instruction value step drops through a #1 to a #4 functional module and then reaches a #5 functional module, meanwhile, an AGC instruction value also passes through a #6 functional module to generate a load reduction judgment signal, meanwhile, a #7 functional module also calculates and judges the difference value of the AGC instruction value, a unit load instruction value being executed and a unit actual load value, when the following conditions are met, ① the direction of the load reduction of the AGC instruction change is reached, ② after the AGC instruction change, the difference value of the unit load instruction value is larger than (>) the unit actual load value is larger than or equal to (≧) the AGC instruction value, ③ the unit load instruction value and the unit actual load value reach a preset difference judgment value (we are set to be larger than or equal to 3.5MW), the #5 functional module directly switches the unit load instruction value to the current unit actual load value and reduces the load according to the speed from the difference value, and an operation curve is shown in FIG. 12.
Taking AGC load-up as an example, the AGC instruction value rises step by step and reaches a #5 function module after passing through a #1 to a #4 function module, meanwhile, the AGC instruction value also passes through a #6 function module to generate a load-up judgment signal, meanwhile, a #7 function module also calculates and judges the difference value of the AGC instruction value, the unit load instruction value being executed and the actual load value of the unit, when the following conditions are met, ① the AGC instruction changes the load-up direction, ② the numerical relationship of the AGC instruction after the AGC instruction changes, the AGC instruction value is greater than or equal to (greater than or equal to) the actual load value of the unit and is greater than (greater than or equal to) the actual load instruction value of the unit, ③ the load instruction value of the unit and the actual load value of the unit reach a preset difference judgment value (set to 3.5MW in the example), the #5 function module directly switches the load instruction value of the unit to the actual load value of the unit and increases the load according to the speed from the value, and the operation curve is as shown in figure 13.
By adopting the novel algorithm, the time after the actual load of the unit is intersected with the load instruction of the unit is reduced, so that the time from the AGC instruction change to the actual load change of the unit is shortened, and the load change rate of the unit is improved.
Claims (7)
1. A unit load instruction logic regulation and control method based on an AGC mode is characterized by comprising the following steps:
step 1, adding an AGC instruction ascending/descending direction judging loop to a load control loop of a coordinated control system;
step 2, adding a deviation value calculation loop in a load control loop of the coordination control system;
step 3, adding a deviation value and a preset deviation limit value judgment loop in a load control loop of the coordination control system;
step 4, adding a tracking and switching loop in a load control loop of the coordination control system;
step 5, adding the input basic condition judgment loop of the tracking and switching loop in the step 4 into a load control loop of the coordination control system;
step 6, analyzing the AGC instruction value change stage from the DCS historical data of the unit, inquiring the AGC instruction value, the unit load instruction value and the operation data of the actual load of the unit, and presetting the control logic parameters in the steps 1 to 4;
and 7, putting the coordination control system into actual operation, checking the control effect according to the operation curve, and resetting the parameters after analyzing data according to the effect until the control requirements are met.
2. The method for logically regulating and controlling the unit load instruction based on the AGC mode as claimed in claim 1, wherein in the step 1, the AGC instruction ascending/descending direction judging loop is a #6 functional block; the up-down direction of the AGC instruction is determined by the subtraction block and the high value judgment and the low value judgment in the #6 function block.
3. The AGC scheme-based unit load instruction logic control method according to claim 1, wherein the deviation value calculation loop, the deviation value and preset deviation limit value judgment loop in the step 2 and the step 3 are #7 functional blocks; after the #7 function block obtains the deviation value through the 3 subtraction blocks, the judgment of the deviation value and the preset deviation limit value is carried out by the high value judgment and the low value judgment.
4. The AGC-based unit load instruction logic control method according to claim 3, wherein the preset deviation limit is a value set according to a unit rated power, is a value obtained by multiplying the rated power by 0.5% -1%, and is set according to a time required by the unit to lift 0.5% -1% of the rated power load for 20-40 seconds.
5. The method according to claim 1, wherein the step 4 comprises tracking and switching a loop, namely a #5 functional block, and performing comprehensive judgment after receiving signals of other loops to switch the AGC instruction.
6. The AGC method-based unit load instruction logic control method according to claim 1, wherein the basic condition of the step 5 is that the unit is in the AGC mode and in a coordinated control mode; and a basic condition judgment loop is a #8 functional block and comprises a switching value functional block, an analog value functional block and a T switching station, and the load rate of the unit is obtained.
7. The AGC method-based unit load instruction logic control method according to claim 1, wherein the step 6 is executed by a #1-4 function block, the #1 function block is provided with a manual automatic block, and whether an AGC instruction is received or not is automatically judged; a #2 functional block with a T switching station, which judges whether to accept the AGC instruction value according to the state of the unit equipment; a #3 function block with a high-low limit block for receiving AGC command value to perform high limit and low limit to prevent overrun; the #4 functional block is provided with a T switching station, and ensures that the unit does not accept AGC and accepts an RB target instruction value under the RB working condition.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111694275A (en) * | 2020-06-09 | 2020-09-22 | 烟台龙源电力技术股份有限公司 | Equipment control method and device and electronic equipment |
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| CN108448593A (en) * | 2018-02-11 | 2018-08-24 | 华电电力科学研究院有限公司 | A kind of control system and control method shortening the AGC response times |
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| US20150268683A1 (en) * | 2012-12-07 | 2015-09-24 | Battelle Memorial Institute | Direct load control frequency regulation support system |
| CN103713613A (en) * | 2014-01-02 | 2014-04-09 | 国家电网公司 | Method for achieving optimizing control of load of thermal power generating unit in PROPR mode |
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Application publication date: 20200114 |