CN115833270A - Strategy method for improving generating capacity of unit - Google Patents
Strategy method for improving generating capacity of unit Download PDFInfo
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- CN115833270A CN115833270A CN202211391883.4A CN202211391883A CN115833270A CN 115833270 A CN115833270 A CN 115833270A CN 202211391883 A CN202211391883 A CN 202211391883A CN 115833270 A CN115833270 A CN 115833270A
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Abstract
The invention discloses a strategy method for improving the generating capacity of a unit, which relates to the technical field of hydropower station electric power monitoring systems, and optimizes an AGC active PID (proportion integration differentiation) regulation dead zone of a hydroelectric generating set into an asymmetric type, so that the fluctuation range of dynamic regulation or static regulation of the unit load is smaller, the phenomenon of unsmooth load regulation is avoided, the starting regulation dead zone is [ -1MW, +3MW ], the stopping regulation dead zone is [0MW, +2MW ], namely the starting regulation dead zone of an upper interval is +3MW, the stopping regulation dead zone of the upper interval is +2MW, the starting regulation dead zone of a lower interval is-1 MW, and the stopping regulation dead zone of the lower interval is 0MW, so that the effects of improving the frequency modulation performance and the control capacity of active regulation dynamic and static deviation are achieved, the problem that the unit cannot realize full output under the condition of full output is thoroughly solved, the aim of improving the generating capacity on the premise of meeting the related technical specification of power grid regulation is fulfilled, and the economic benefit is increased.
Description
Technical Field
The invention relates to the technical field of hydropower station electric power monitoring systems, in particular to a strategy method for improving the generating capacity of a unit.
Background
The AGC active PID regulation mode of the current hydropower station mainly comprises a speed regulator power mode and a speed regulator opening mode; the difference between the two is that: under the speed regulator power mode, the speed regulator performs closed-loop feedback regulation on the real unit active power value according to the target unit active power value, typically, the speed regulator power mode is used for performing active power regulation on three gorges power stations, stream-luodie power stations, and power stations facing to a home dam; under the opening mode of the speed regulator, a monitoring system sends out regulating pulses to the speed regulator according to the deviation of a unit active power target value and a unit active power actual value, a guide vane opening set value of the speed regulator is corrected, the speed regulator carries out closed-loop feedback regulation on the guide vane opening according to the guide vane opening target value, and the active power regulation is carried out in the opening mode of the speed regulator typically in a glutinous rice ferry power station, a small bay power station, a diffuse bay power station, a landscape flood power station, a dragon opening power station and the like.
The existing hydropower station electric power monitoring system has the following problems:
(1) Under the condition of large-format operation of the hydroelectric generating set, when an active plan curve issued by a total dispatching system is rated output (1400 MW) of the whole plant, an active set value issued by an actual dispatching system is lower than 1400MW, according to load curve analysis of the active actual output and an active target value, the active load is influenced by a primary frequency modulation action after being regulated in place, the probability that the active actual output value is distributed between the upper part and the lower part of the active target value of the whole plant is about 1, and the hydroelectric generating set cannot achieve the full output under the large-format operation;
(2) The AGC (automatic generation control) of the power station has the advantages that the dynamic regulation or static regulation fluctuation range of the unit load is slightly larger in the original power regulation dead zone fixed value mode, and the phenomenon of unsmooth load regulation is easy to occur.
Disclosure of Invention
The invention provides a strategy method for improving the generating capacity of a unit, which can alleviate the problems.
In order to alleviate the above problems, the technical scheme adopted by the invention is as follows:
the invention provides a strategy method for improving the generating capacity of a unit, which optimizes an AGC active PID (proportion integration differentiation) regulation dead zone of a hydroelectric generating set into an asymmetric type, and enables a start-up regulation dead zone to be [ -1MW, +3MW ], a stop-regulation dead zone to be [0MW, +2MW ], namely, the start-up regulation dead zone of an upper interval is +3MW, the stop-regulation dead zone of the upper interval is +2MW, the start-up regulation dead zone of a lower interval is-1 MW, and the stop-regulation dead zone of the lower interval is 0MW.
In a preferred embodiment of the present invention, when the hydropower station power monitoring system issues an active power reduction command and executes the active power reduction command, if the active power actual value of the hydroelectric generating set, which is involved in the AGC active PID adjustment, and the deviation of the AGC assigned to the single-machine target value both enter the upper interval dead zone, the execution of the active power reduction command is ended.
In a preferred embodiment of the present invention, when the power monitoring system of the hydropower station issues the active power increase instruction and executes the active power increase instruction, if the active power actual value of the hydroelectric generating set, which is involved in the AGC active PID adjustment, and the deviation of the target value allocated to the single machine by the AGC both enter the lower interval dead-time zone or the upper interval dead-time zone, the execution of the active power increase instruction is finished.
In a preferred embodiment of the present invention, when the power monitoring system of the hydropower station does not issue a new active power adjusting command, and the load deviation caused by the primary frequency modulation action of the hydroelectric generator set exceeds the start-up dead zone of the upper interval, the primary frequency modulation action of the hydroelectric generator set is reset for 40s, and then the active real output value of the hydroelectric generator set adjusted by the AGC active PID is adjusted to the stop-up dead zone of the upper interval again.
In a preferred embodiment of the invention, when the power monitoring system of the hydropower station does not issue a new active regulation instruction and the load deviation caused by the primary frequency modulation action of the hydroelectric generating set exceeds the starting modulation dead zone of the lower interval, the primary frequency modulation action of the hydroelectric generating set is reset for 40s, and then the active actual output value of the hydroelectric generating set regulated by the AGC active PID is regulated to the stop modulation dead zone again.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the power station unit under the large-square running, the unit active power regulation dead zone constant value mode is provided for optimization, the unit active power regulation dead zone is optimized from a symmetrical type [ -3MW, +3MW ] (start regulation dead zone) and [ -2MW, +2MW ] (stop regulation dead zone) to an asymmetrical type [ -1MW, +3MW ] (start regulation dead zone) and [0MW, +2MW ] (stop regulation dead zone), the effects of improving the frequency modulation performance and the control capability of active regulation dynamic and static deviation are achieved, the dynamic regulation or static regulation fluctuation range of the unit load is smaller, the phenomenon of uneven load regulation can not occur, the problem that the unit cannot realize full output under the condition of full output is thoroughly solved, the aim of improving the power generation capability under the premise of meeting the related technical specification of power grid AGC regulation is fulfilled, and the economic benefit is increased.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of an AGC active PID adjustment optimization pre-process segment of a power monitoring system provided, in which: the active power regulation dead zone of the unit before optimization is symmetrical, namely symmetrical type [ -3MW, +3MW ] (start regulation dead zone) and [ -2MW, +2MW ] (stop regulation dead zone);
fig. 2 is a schematic diagram of an AGC active PID adjustment optimization post-program segment of the provided power monitoring system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
The strategy method for improving the generating capacity of the unit optimizes the active adjusting dead zone of the unit from a symmetrical type [ -3MW, +3MW ] (start-up adjusting dead zone) and [ -2MW, +2MW ] (stop-adjustment dead zone) to an asymmetrical type [ -1MW, +3MW ] (start-up adjusting dead zone) and [0MW, +2MW ] (stop-adjustment dead zone), achieves the effects of improving the frequency modulation performance and the active adjusting dynamic and static deviation control capacity, thoroughly solves the problem that the unit cannot realize full output under the condition of full output, and simultaneously achieves the aim of improving the generating capacity on the premise of meeting the related technical specification of power grid AGC adjustment.
When an active power reduction command is issued in a hydropower station power monitoring system and executed, the active power reduction command is the same as the strategy in the prior art, namely if the active power actual value of the hydroelectric generating set, which is subjected to AGC active PID adjustment, and the deviation of the AGC distributed to a single machine target value all enter an upper interval stop adjustment dead zone (+ 2 MW), the execution of the active power reduction command is finished.
When an active power increase instruction is issued in a hydropower station electric power monitoring system and is executed, the strategies of the prior art are different, and specifically: and if the active actual value of the hydroelectric generating set participating in AGC active PID regulation and the deviation of the target value distributed to a single machine by the AGC all enter a lower interval modulation dead zone (0 MW) or an upper interval modulation dead zone (+ 2 MW), finishing the execution of the active increase instruction.
Wherein, the lower interval is a negative regulation interval, and the upper interval is a positive regulation interval.
When the power monitoring system of the hydropower station does not issue a new active regulation instruction, and the load deviation caused by the primary frequency modulation action of the hydroelectric generating set exceeds the starting regulation dead zone (+ 3 MW) of the upper interval, the active real generation value of the hydroelectric generating set regulated by the AGC active PID is regulated to the stopping regulation dead zone (+ 2 MW) of the upper interval again after the primary frequency modulation action of the hydroelectric generating set is reset for 40 s.
When the power monitoring system of the hydropower station does not issue a new active adjusting instruction, and the load deviation caused by the primary frequency modulation action of the hydroelectric generating set exceeds the starting modulation dead zone (-1 MW) of the lower interval, the primary frequency modulation action of the hydroelectric generating set is reset for 40s, and then the active actual value of the hydroelectric generating set adjusted by the AGC active PID is adjusted to the modulation stop dead zone [0MW, +2MW ].
As shown in fig. 2, a schematic diagram of an optimized post-AGC active PID adjustment program segment of the power monitoring system provided by the present invention;
wherein: the active power regulation dead zone of the optimized unit is asymmetric, namely asymmetric type [ -1MW, +3MW ] (start regulation dead zone) and [0MW, +2MW ] (stop regulation dead zone).
The hydroelectric generating set No. 1 of the plant adopts the strategy, and after tests show that the active regulation dead zone of the set is optimized in the AGC active PID regulation of the hydropower station electric power monitoring system, the frequency modulation performance and the active regulation dynamic and static deviation control capacity are improved, the full-capacity set of the set is realized, and the economic benefit is increased.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A strategy method for improving generating capacity of a unit is characterized in that an AGC active PID adjusting dead zone of a hydroelectric generating set is optimized to be asymmetric, a starting adjusting dead zone is [ -1MW, +3MW ], a stopping adjusting dead zone is [0MW, +2MW ], namely the starting adjusting dead zone of an upper interval is +3MW, the stopping adjusting dead zone of the upper interval is +2MW, the starting adjusting dead zone of a lower interval is-1 MW, and the stopping adjusting dead zone of the lower interval is 0MW.
2. The strategy method for improving the generating capacity of the unit according to claim 1, wherein when the hydropower station power monitoring system issues an active reduction command and executes the active reduction command, if the active actual value of the hydroelectric generating set, which is involved in the AGC active PID adjustment, and the deviation of the AGC allocation to the single-machine target value both enter the upper interval dead zone, the execution of the active reduction command is finished.
3. The strategy method for improving the generating capacity of the unit according to claim 2, wherein when the power monitoring system of the hydropower station issues an active power increase command and executes the active power increase command, if the active power actual value of the hydroelectric generating set, which is involved in the AGC active PID adjustment, and the deviation of the AGC assigned to the single-machine target value both enter a lower-interval dead-band stop-modulation dead zone or an upper-interval dead-band stop-modulation zone, the execution of the active power increase command is finished.
4. The strategy method for improving the generating capacity of the unit according to claim 3, wherein when a new active regulation command is not issued by the hydropower station power monitoring system, and the load deviation caused by the primary frequency modulation action of the hydroelectric generator set exceeds the starting-regulation dead zone of the upper interval, the primary frequency modulation action of the hydroelectric generator set is reset for 40s, and then the active actual generating value of the hydroelectric generator set subjected to AGC active PID regulation is regulated to the stopping-regulation dead zone of the upper interval again.
5. The strategy method for improving the generating capacity of the unit according to claim 4, wherein when the power monitoring system of the hydropower station does not issue a new active regulation command and the load deviation caused by the primary frequency modulation action of the hydroelectric generating set exceeds the starting regulation dead zone of the lower interval, the active actual generating value of the hydroelectric generating set regulated by the AGC active PID is regulated to the stopping regulation dead zone again after the primary frequency modulation action of the hydroelectric generating set is reset for 40 s.
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| CN202211391883.4A CN115833270A (en) | 2022-11-08 | 2022-11-08 | Strategy method for improving generating capacity of unit |
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| CN202211391883.4A CN115833270A (en) | 2022-11-08 | 2022-11-08 | Strategy method for improving generating capacity of unit |
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