CN111082438B - Control method for locking AGC instruction of priority primary frequency modulation function - Google Patents
Control method for locking AGC instruction of priority primary frequency modulation function Download PDFInfo
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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
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Abstract
The invention relates to a control method for locking an AGC instruction by a priority primary frequency modulation function, which belongs to the field of primary frequency modulation control of generator sets, and is used for preferentially meeting the control requirement of primary frequency modulation when the change direction of the load instruction of the AGC is inconsistent with the change direction of the load instruction of the primary frequency modulation requirement, locking the AGC instruction, ensuring the correctness of the instruction direction, and recovering the normal function of the AGC instruction after the signals of the change direction of the load instruction of the AGC and the change direction of the load instruction of the primary frequency modulation requirement disappear. According to the control method for locking the AGC command by the priority primary frequency modulation function, when the change direction of the load command of the AGC is inconsistent with the change direction of the load command of the primary frequency modulation requirement, the AGC command is reasonably locked while the primary frequency modulation is responded preferentially, the timeliness and the accuracy of the unit response to the power grid side are ensured, and the benefit of generating the income of the unit is ensured.
Description
Technical Field
The invention belongs to the field of primary frequency modulation control of generator sets, and particularly relates to a control method for locking an AGC instruction by a priority primary frequency modulation function.
Background
When the unit is put into the primary frequency modulation and AGC functions, the situation that the load instruction change direction of AGC is inconsistent with the load instruction change direction of the primary frequency modulation requirement often occurs. At the moment, according to the related requirements of the power grid dispatching regulations (two rules), the control requirements of primary frequency modulation should be met preferentially, the AGC instruction is locked, and the accuracy of the instruction direction is ensured; and when the inconsistent signal of the load instruction change direction of the AGC and the load instruction change direction of the primary frequency modulation requirement disappears, the normal function of the AGC instruction is recovered.
Disclosure of Invention
The invention aims to provide a control method for locking an AGC instruction with priority primary frequency modulation function, which ensures the rapidity and accuracy of primary frequency modulation action by locking the adjustment of the AGC instruction in a short time.
The invention relates to a control method for locking AGC instructions by a priority primary frequency modulation function, which comprises the following steps:
step one: judging and triggering signals with the reverse action directions of primary frequency modulation and AGC; current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) When the difference value of the AGC command is greater than +2r/min, and the difference value of the AGC command after the AGC command and the limiting speed is greater than +2MW, at the moment, a first path of signals with opposite action directions of primary frequency modulation and AGC is generated; current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) When the difference value of the AGC command is smaller than-2 r/min and the difference value of the AGC command after the AGC command and the limiting speed is smaller than-2 MW, a signal second path with the opposite action direction of the primary frequency modulation and the AGC is generated; if any one of the first path and the second path of signals with the reverse action direction of the primary frequency modulation and the AGC is 1, the primary frequency modulation and the reverse action direction of the AGC are indicated, and the output of the OR module is 1;
step two: after the primary frequency modulation and the AGC action direction are triggered by signals with opposite directions, namely after any one path of the OR module is triggered by 1, two paths of signals are generated for performing phase-to-phase operation: the first path is an OR module trigger signal; the second path is a second path which is generated by triggering the OR module signal and then is used as a pulse signal;
when the two paths pass through the AND3 phase AND meet the requirement at the same time, the AND3 triggers AND outputs 1, AND the signal is used as a trigger condition for triggering the functional block T AND is used as a selection signal in the step three;
step three: when the triggering condition of the triggering functional block T is 1, selecting a Y loop to output, namely outputting an AGC instruction at the previous moment as an AGC instruction at the current moment through the switching functional block T; when the triggering condition of the triggering functional block T is 0, selecting N loop to output, and outputting the AGC instruction given by the power grid at the current moment through the switching functional block T.
Further, the control method for locking AGC command of the priority primary frequency modulation function of the present invention includes the following steps: current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) Performing difference operation through a SUB1 subtracting functional block, comparing the difference with +2r/min through a high-value functional block H1, AND when the difference is larger than +2r/min, meeting the first path condition of the AND 1; meanwhile, the AGC command after the current AGC command and the speed limit rate of the unit is subjected to difference calculation through the SUB2The difference value of the two is compared through a high-value functional block H2, AND when the difference value is larger than +2MW, the second path condition of the AND1 is met; at the moment, two paths of conditions of the AND1 are met, AND the first path of the OR module is triggered;
current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) Performing difference operation through a SUB1 subtracting functional block, comparing the difference with-2 r/min through a low-value functional block L1, AND when the difference is smaller than-2 r/min, meeting the first path condition of the AND 2; meanwhile, the current AGC command of the unit AND the AGC command after speed limiting rate are subjected to difference calculation through a SUB2, the difference value of the current AGC command AND the AGC command is compared through a low-value functional block L2, AND when the difference value is smaller than-2 MW, the second path condition of the AND2 is met; at this time, the two-way condition of AND2 is satisfied, AND the OR module triggers the second way.
The invention relates to a control method for locking AGC instructions by a priority primary frequency modulation function, which comprises the following steps that a pulse signal is a 60s 1 pulse signal; the stabilizing time of the unit participating in primary frequency modulation is less than 60s, and the primary frequency modulation does not reach various relevant technical indexes within 60s, so that the power grid carries out primary frequency modulation examination on the generator unit. Setting the trigger time of the load instruction change direction of the AGC and the load instruction change direction opposite signal of the primary frequency modulation requirement to be 60s, and recovering the normal function of the AGC instruction after 60 s. Therefore, the logic realizes the control requirement of preferentially responding to primary frequency modulation, and ensures the real-time performance and accuracy of the unit responding to the power grid side instruction.
The invention relates to a control method for locking AGC instructions by a priority primary frequency modulation function, wherein the rated rotation speed r is 3000r/min.
When any one of the first path AND the second path of the AND3 is not satisfied, signals indicating the change direction of the load instruction of the AGC AND the change direction of the load instruction of the primary frequency modulation requirement disappear, AND the normal function of the AGC instruction is recovered.
AND3 first path: the stabilizing time of the unit participating in primary frequency modulation is less than 60s, and the primary frequency modulation does not reach various relevant technical indexes within 60s, so that the power grid carries out primary frequency modulation examination on the generator unit. Setting the trigger time of the load instruction change direction of the AGC and the load instruction change direction opposite signal of the primary frequency modulation requirement to be 60s, and recovering the normal function of the AGC instruction after 60 s.
AND3 second path: after the load instruction change direction of AGC and the load instruction change direction of primary frequency modulation requirement are triggered by the opposite signals, the current actual rotating speed r of the steam turbine Real world And rated rotation speed r Forehead (forehead) The difference value re-enters a 'primary frequency modulation dead zone' (within the range of |± 2|r/min) at any time within 60 seconds, and the normal function of the AGC command is immediately restored.
According to the control method for locking the AGC command by the priority primary frequency modulation function, when the change direction of the AGC load command is inconsistent with the change direction of the primary frequency modulation required load command, the primary frequency modulation requirement can be responded quickly, meanwhile, the AGC command is locked reasonably, timeliness and accuracy of the unit in responding to the load change of the power grid side are guaranteed, and the running stability and economy of the unit are improved.
Drawings
Fig. 1 is a flow chart of a control method for locking an AGC instruction by a priority primary frequency modulation function according to the present invention.
Detailed Description
The following describes the control method of the priority primary frequency modulation function locking AGC instruction according to the present invention in detail through the accompanying drawings and the embodiments.
Example 1
As shown in fig. 1, the control method for locking the AGC instruction by the priority primary frequency modulation function according to the embodiment specifically includes the following steps:
step one: and judging and triggering signals with the opposite action directions of the primary frequency modulation and the AGC. When the difference value between the actual rotating speed of the steam turbine and the rated rotating speed 3000r/min of the steam turbine is larger than +2r/min, and the difference value between the AGC command and the AGC command after the speed limit is larger than +2MW, at the moment, a first path of signals with opposite action directions of primary frequency modulation and AGC is generated; when the difference value between the actual rotating speed of the steam turbine and the rated rotating speed 3000r/min of the steam turbine is smaller than-2 r/min, and the difference value between the AGC command and the AGC command after the speed limit is smaller than-2 MW, a signal second path with the opposite action direction of the primary frequency modulation and the AGC is generated. If any one of the two paths satisfies 1, the primary frequency modulation and the AGC action direction are opposite, and the OR module outputs 1.
When the turbine is currently actually rotatedSpeed r Real world Carrying out difference operation with a rated rotation speed 3000r/min through a SUB1 subtraction functional block, comparing the difference with +2/min through a high-value functional block H1, AND when the difference is larger than +2r/min, meeting the first path condition of the AND 1; meanwhile, the difference between the current AGC command of the unit AND the AGC command after speed limiting rate is calculated through the SUB2, the difference between the current AGC command AND the AGC command is compared through the high-selection functional block H2, AND when the difference is larger than +2MW, the second path condition of the AND1 is met. At this time, the two paths of conditions of AND1 are satisfied, AND the first path of the OR module is triggered.
When the current actual rotation speed r of the steam turbine Real world Carrying out difference operation with a rated rotation speed 3000r/min through a SUB1 subtraction functional block, comparing the difference with-2 r/min through a low-value functional block L1, AND when the difference is smaller than-2 r/min, meeting the first path condition of the AND 2; meanwhile, the difference between the current AGC command of the unit AND the AGC command after speed limiting rate is calculated through the SUB2, the difference between the current AGC command AND the AGC command is compared through the low-value functional block L2, AND when the difference is smaller than-2 MW, the second path condition of the AND2 is met. At this time, the two-way condition of AND2 is satisfied, AND the OR module triggers the second way.
Step two: after the primary frequency modulation and the AGC action direction are triggered by signals with opposite directions, namely after any one path of the OR module is triggered by 1, two paths of signals are generated to perform phase AND operation: the first path is an OR module trigger signal; the second path is an OR module signal, and a pulse signal with 60s of 1 is generated after the signal is triggered. When the two signals pass through the AND3 phase AND are simultaneously satisfied, the AND3 triggers to be '1', AND the signals serve as triggering conditions for triggering the functional block T AND serve as selection signals in the step three.
Step three: when the triggering condition of the functional block T is 1, selecting a Y loop to output, and outputting an AGC instruction at the previous moment as an AGC instruction at the current moment through switching the functional block T; when the triggering condition of the sending functional block T is 0, selecting N loop to output, and outputting the AGC instruction given by the power grid at the current moment through the switching functional block T.
Example two
On the basis of the first embodiment, when the actual rotating speed of the steam turbine is 3004r/min, performing a difference operation with the rated rotating speed 3000r/min of the steam turbine, wherein the result is +4r/min AND greater than +2r/min, AND at the moment, the first path of the AND1 module is triggered;
when the power grid side dispatches the AGC command to rise load from 300MW to 350MW, the AGC command AND the AGC command after the speed limit rate are subjected to difference calculation, when the difference is larger than +2MW, the AGC is indicated to require the unit to rise load, AND the AND1 module triggers in the second path;
when the two paths of the AND1 functional block are triggered simultaneously, the first path of the OR module is triggered, the first path of the AND3 module is triggered to be 1, the OR module is triggered AND triggers a 60s pulse signal which is '1' through the pulse module, namely, the second path of the AND3 module is triggered, at the moment, the AND3 is conducted AND triggers 1, the AGC command is indicated to be opposite to the primary frequency modulation action direction, the output of the selection module T is 1, the Y path of the output is selected, namely, the AGC command at the last moment is kept, AND the AGC command is locked.
After the load instruction change direction of the AGC AND the load instruction change direction opposite signal of the primary frequency modulation requirement disappear, the AND3 triggering condition is not met at the moment, namely, the AGC AND the primary frequency modulation action direction opposite signal disappear, the selection module T is 0 at the moment AND selects AND outputs N paths, the AGC instruction given by the power grid at the current moment is continuously received, AND the unit is regulated AND controlled.
Example III
On the basis of the first embodiment, when the actual rotating speed of the steam turbine is 2996r/min, performing difference value operation with the rated rotating speed 3000r/min of the steam turbine, wherein the result is-4 r/min AND less than-2 r/min, AND at the moment, the first path of the AND2 module is triggered;
when the load of the AGC command is reduced from 350MW to 300MW in the power grid side dispatching, the AGC command AND the AGC command after the speed limit rate are subjected to difference calculation, AND when the difference value is smaller than-2 MW, the AGC is indicated to require the unit to reduce the load, AND the AND2 module is triggered in the second path;
when two paths of the AND2 functional block are triggered simultaneously, the second path of the OR module is triggered, the first path of the OR module is triggered to be 1, the OR module is triggered AND triggers a 60s pulse signal which is '1' through the pulse module, namely, the second path of the AND3 module is triggered, at the moment, the AND3 is conducted AND triggers 1, the AGC command is indicated to be opposite to the primary frequency modulation action direction, the output of the selection module T is 1 at the moment, the Y path of output is selected, namely, the AGC command at the last moment is kept, AND the AGC command is locked.
After the load instruction change direction of the AGC AND the load instruction change direction opposite signal of the primary frequency modulation requirement disappear, the AND3 triggering condition is not met at the moment, namely the AGC AND the primary frequency modulation action direction opposite signal disappear, the selection module T is 0 at the moment AND selects N paths of output, the AGC instruction at the current moment is continuously received, AND the unit is regulated AND controlled.
According to the control method for locking the AGC command by the priority primary frequency modulation function, when the load command change direction of the AGC is inconsistent with the load command change direction of the primary frequency modulation request, the control request of the primary frequency modulation is preferentially met, the AGC command is locked, the accuracy of the command direction is guaranteed, and when signals with opposite load command change directions of the AGC and the primary frequency modulation request disappear, the normal function of the AGC command is restored.
According to the control method for locking the AGC command by the priority primary frequency modulation function, when the change direction of the load command of the AGC is inconsistent with the change direction of the load command of the primary frequency modulation requirement, the AGC command is reasonably locked while the primary frequency modulation is responded preferentially, the timeliness and the accuracy of the unit response to the power grid side are ensured, and the benefit of generating the income of the unit is ensured.
Claims (4)
1. A control method for locking AGC instructions of a priority primary frequency modulation function is characterized by comprising the following steps: step one: judging and triggering signals with the reverse action directions of primary frequency modulation and AGC; current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) When the difference value of the AGC command is greater than +2r/min, and the difference value of the AGC command after the AGC command and the limiting speed is greater than +2MW, at the moment, a first path of signals with opposite action directions of primary frequency modulation and AGC is generated; current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) When the difference value of the AGC command is smaller than-2 r/min and the difference value of the AGC command after the AGC command and the limiting speed is smaller than-2 MW, a signal second path with the opposite action direction of the primary frequency modulation and the AGC is generated; if any one of the first path and the second path of the signal with the reverse action direction of the primary frequency modulation and the AGC is 1, the primary frequency modulation and the reverse action direction of the AGC are indicated, and the OR module outputs as1；
Step two: after the primary frequency modulation and the AGC action direction are triggered by signals with opposite directions, namely after any one path of the OR module is triggered by 1, two paths of signals are generated for performing phase-to-phase operation: the first path is an OR module trigger signal; the second path is a second path which is generated by triggering the OR module signal and then is used as a pulse signal;
when the two paths pass through the AND3 phase AND meet the requirement at the same time, the AND3 triggers AND outputs 1, AND the signal is used as a trigger condition for triggering the functional block T AND is used as a selection signal in the step three;
step three: when the triggering condition of the triggering functional block T is 1, selecting a Y loop to output, and outputting an AGC instruction at the previous moment as an AGC instruction at the current moment through the switching functional block T; when the triggering condition of the triggering functional block T is 0, selecting N loop to output, and outputting the AGC instruction given by the power grid at the current moment through the switching functional block T.
2. The method for controlling the lock AGC command of the priority primary frequency modulation function according to claim 1, wherein in the first step: current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) Performing difference operation through a SUB1 subtracting functional block, comparing the difference with +2r/min through a high value judging block H1, AND when the difference is larger than +2r/min, meeting the first path condition of the AND 1; meanwhile, the current AGC command of the unit AND the AGC command after speed limiting rate are subjected to difference calculation through a SUB2, the difference value of the current AGC command AND the AGC command is compared through a high value judging block H2, AND when the difference value is larger than +2MW, the second path condition of the AND1 is met; at the moment, two paths of conditions of the AND1 are met, AND the first path of the OR module is triggered;
current actual rotational speed r of steam turbine Real world And rated rotation speed r Forehead (forehead) Performing difference operation through a SUB1 subtracting functional block, comparing the difference with-2 r/min through a low value judging block L1, AND when the difference is smaller than-2 r/min, meeting the first path condition of the AND 2; meanwhile, the current AGC command of the unit AND the AGC command after speed limiting rate are subjected to difference calculation through a SUB2, the difference value of the current AGC command AND the AGC command is compared through a low value judging block L2, AND when the difference value is smaller than-2 MW, the second path condition of the AND2 is met; at this time, the two-way condition of AND2 is satisfied, OR moduleThe second way triggers.
3. The method according to claim 1 or 2, wherein the pulse signal in the second step is a pulse signal with 60s being "1".
4. A control method for locking AGC instructions for a priority primary frequency modulation function according to claim 3, wherein: the rated rotation speed r Forehead (forehead) 3000r/min.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112865134A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Power grid frequency primary frequency modulation control system |
| CN112865135B (en) * | 2021-01-15 | 2022-09-06 | 国网江苏省电力有限公司 | Primary frequency modulation priority control method for new energy station |
| CN113078658B (en) * | 2021-03-19 | 2023-09-05 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Primary frequency modulation control method based on unit output limit |
| CN113364010B (en) * | 2021-06-22 | 2022-08-30 | 南方电网电力科技股份有限公司 | Unit frequency modulation mode judgment method |
| CN114784824B (en) * | 2022-05-06 | 2023-03-10 | 安徽钱营孜发电有限公司 | Control method for primary frequency modulation priority action based on power grid large frequency difference |
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