CN108448593A - A kind of control system and control method shortening the AGC response times - Google Patents
A kind of control system and control method shortening the AGC response times Download PDFInfo
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- CN108448593A CN108448593A CN201810138891.5A CN201810138891A CN108448593A CN 108448593 A CN108448593 A CN 108448593A CN 201810138891 A CN201810138891 A CN 201810138891A CN 108448593 A CN108448593 A CN 108448593A
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/381—Dispersed generators
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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
- H02J3/48—Controlling the sharing of the in-phase component
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Abstract
The present invention relates to a kind of control systems and control method shortening the AGC response times, belong to power plant thermal technics technical field.During load change, when target instruction target word is changed direction in advance, active power following feature is poor, and the AGC response times often exceed " two detailed rules and regulations " regulation time limit 60s.The present invention includes target instruction target word generation unit, wattful power messurement unit, override operating mode arithmetic element, load instruction switch unit, rate switch unit, Rate control unit and unit actual load instruction generation unit.Instruct the logical relation judgement override operating mode of (LDC) whether true according to target instruction target word, active power and unit actual load.When override operating mode is set up, LDC is switched into active power value, when override operating mode disappears, LDC is restored to normal value by delay 1s.The present invention solves the problems, such as that active power responds slow under override operating mode, is effectively shortened the generating set AGC response times.
Description
Technical field
The invention belongs to power plant thermal technics technical fields, are related to a kind of control system for shortening the AGC response times
System and control method.
Background technology
1) in recent years because of the adjustment of national energy policy, the more and more wind energies in the Northwest, photovoltaic generation unit are incorporated to
Operation of power networks, with the promotion of new energy proportion, mains frequency fluctuation is more apparent.
2) most of power grids use order wire frequency deviation control model, (i.e. using primary frequency modulation and frequency modulation frequency modulation means
AGC) carry out electric power grid frequency stabilization, the randomness of AGC instructions is highlighted because of the promotion of generation of electricity by new energy amount.
3) Northwest Grid " two detailed rules and regulations " middle finger mark specifies AGC check requirements, and the spy changed at random is instructed in face of AGC
Property, many generator group coordination and control system (CCS) adaptability are insufficient, monthly because the AGC response times transfinite generation largely
Point is examined, larger economic loss is brought to enterprise.
4) currently, there is domestic patent to mention grid side AGC optimization technologies, including automatic power generation system and its load it is pre-
The method for surveying automatic Synthesis optimization, and the adaptive cooperation method of power grid frequency modulation mode, since new energy unit output is steady
Qualitative to be influenced by natural environment, mains side stability deficiency makes the patented technology of grid side AGC optimization classes
With certain limitation.Also there is domestic patent to mention and improve unit AGC response characteristics with coal unit CCS prioritization schemes,
Effective countermeasure is proposed due to not being directed to AGC instruction randomnesss so that there are the blind area of control for such patented technology.
5) in order to improve generating set AGC performance assessment criteria, further electric power grid frequency stabilization, it is necessary to refer to for AGC comprehensively
The random performance enabled designs a kind of control system shortening the AGC response times.
Invention content
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and when providing a kind of shortening AGC response
Between control system, the system used unit actual load instruct (LDC) override technology, target refers to during load change
(Target) and unit active power (Load) is enabled to change direction inconsistent, and when Load changes direction and must change, then by LDC
Load values (hereinafter referred to as override operating mode) are switched to, after the disappearance of override operating mode, LDC is restored to normal value by delay 1s.Using
Above-mentioned technology is to solve the problems, such as that Load is responded slow under override operating mode.
Technical solution is used by the present invention solves the above problems：A kind of control system shortening the AGC response times, packet
It includes：Target instruction target word generation unit, wattful power messurement unit, override operating mode arithmetic element, load instruction switch unit, rate are cut
Change unit, Rate control unit and unit actual load instruction generation unit；It is characterized in that, the override operating mode arithmetic element
The input terminal of the first via be connected with the output end of target instruction target word generation unit, the second tunnel of the override operating mode arithmetic element
Input terminal is connected with the output end of wattful power messurement unit, the third road input terminal and unit of the override operating mode arithmetic element
The output end of actual load instruction generation unit is connected, switching switch and the override operating mode arithmetic element of the rate switch unit
Output end be connected, the first via input terminal of the load instruction switch unit and the output end phase of target instruction target word generation unit
Even, the second road input terminal of the load instruction switch unit is connected with the output end of wattful power messurement unit, the load
The switching switch of instruction switch unit is connected with the output end of override operating mode arithmetic element, and the rate of the Rate control unit is set
Definite value is connected with the output end of rate switch unit, and the input terminal of the Rate control unit is defeated with load instruction switch unit
Outlet is connected, and the input terminal of the unit actual load instruction generation unit is connected with the output end of Rate control unit.
Furthermore, the target instruction target word generation unit is configured with filter circuit and gamma correction circuit, for disappearing
Except the transmission error and interference signal of order circuit.
Furthermore, the override operating mode arithmetic element is for receiving target instruction target word, active power and unit actual negative
Lotus instructs and carries out logical operation, and " unit actual load instruction is met during load up>Active power>Target instruction target word "
Condition, or meet " unit actual load instruction during load down<Active power<The condition of target instruction target word ", then judgement is super
Operating mode of speeding is set up.
Furthermore, when override operating mode is set up, the output valve of the load instruction switch unit is switched to wattful power
Rate；When override operating mode disappears, the output valve delay 1s of the load instruction switch unit is restored to target instruction target word.
Furthermore, the rate switch unit realizes load change rate handoff functionality, when override operating mode is set up,
The output valve of rate switch unit is switched to override rate；When override operating mode disappears, the output valve of rate switch unit is restored
To normal speed.
Furthermore, the Rate control unit cooperation load instruction switch unit is synchronous with rate switch unit dynamic
Make, realize that unit actual load instructs override function, when override operating mode is set up, the instruction of unit actual load is switched to active
Performance number；When override operating mode disappears, delay 1s restores normal unit actual load instruction.
Furthermore, the unit actual load instruction generation unit is used for the output valve of receiving velocity control unit,
Reach the subsystems belonging to Coordinated Control Systems under and.
A kind of control method of the control system as described above shortening the AGC response times, which is characterized in that the control
Method includes the following steps：
1) information is collected, the situation of change that real-time monitoring objective instruction, active power and unit actual load instruct；
2) by comparing the size of active power and the instruction of unit actual load, judgement unit load change direction；
3) according to the judgement of the 2nd step as a result, the size that further relatively target instruction target word is instructed with unit actual load, judgement
Whether the variation direction of target instruction target word and current active power is consistent；
4) according to the judgement of the 3rd step as a result, the size of further relatively target instruction target word and active power, judges override operating mode
It is whether true；
5) instruction of unit actual load has been rapidly switched to as a result, when override operating mode is set up according to the judgement of the 4th step
Work(performance number；
6) when override operating mode disappears, the instruction of unit actual load is restored to normal value after the 1s that is delayed, is completed normal
Load change process.
Compared with prior art, the present invention haing the following advantages and effect：The present invention is to follow Target to change by single
LDC instruction, change into override function LDC instruction, once monitor Target and Load variation direction it is inconsistent, and
When Load variations direction must change, then judges that override operating mode is set up, LDC is switched into Load values, after the disappearance of override operating mode,
LDC is restored to normal value in 1 second by delay.
Another advantageous effect of the invention is to be filtered to AGC instructions, and be configured with nonlinear correction, energy
Effectively shielding interference signal eliminates the error that order circuit generates, it is ensured that grid side instructs consistent with the AGC of Generation Side
Property, improve the control accuracy of AGC.
One aspect of the present invention breaks through the limitation of grid side AGC optimization class patented technologies, improves the AGC of generating set
Response sensitivity is more conducive to the stabilization of mains frequency；On the other hand mains side CCS optimization classes patented technology is compensated for not
Foot, can shorten the AGC response times of generating set, and the AGC examination amount of money is greatly reduced, and be created for generating set significant economical
Benefit.
Description of the drawings
Fig. 1 is control system architecture schematic diagram in the present embodiment；
Fig. 2 is override operating mode judgment method flow chart in the present embodiment；
Fig. 3 is that Load response characteristic schematic diagrames under the override operating mode of this technology are not used in the present embodiment；
Fig. 4 is in the present embodiment using Load response characteristic schematic diagrames under the override operating mode of this technology；
Fig. 5 is logical construction schematic diagram in the present embodiment；
In figure：1- power measurements three choose module, 2- power measurements filter module, 3-AGC instruction first-order filterings module, 4-
AGC instruction second-order filters module, 5-AGC instruction gamma corrections module, 6- load instructions manually set module, 7- target loads
Instruction handover module, 8- No.1 load instructions tracking module, No. bis- load instruction tracking modules of 9-, 10- load instruction lower limits are set
Cover half block, 11- load instruction upper limits setting module, 12- load instruction lower limits limitation module, 13- load instruction ceiling restriction moulds
Block, 14- load change rates setup module, 15- No.1 constant functions block, 16- load rate level-ones handover module, 17- bis-
Constant function block, 18- load rate two levels handover module, 19- No.1s subtracter, 20- No.1 high limit judgment module, 21- bis-
The high limit judgment modules of subtracter, 22- No.1 lower bounds judgment module, No. tri- subtracters of 23-, 24- bis-, No. tetra- subtracters of 25-,
No. tri- high limit judgment module of No. bis- lower bound judgment modules of 26-, No. five subtracters of 27-, 28-, No. six subtracters of 29-, 30- tri- are low
Limit judgment module, 31- No.1 condition judgments module, No. bis- condition judgment modules of 32-, No. tri- condition judgment modules of 33-, 34- tetra-
Number condition judgment module, 35- delay turn-off times control module, 36- load instructions handover module, 37- rate limit blocks.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment.
Referring to Fig. 1 to Fig. 5, a kind of control system shortening the AGC response times, including：It is target instruction target word generation unit, active
Power measurement unit, override operating mode arithmetic element, load instruction switch unit, rate switch unit, Rate control unit and machine
Group actual load instruction generation unit；The input terminal of the first via of override operating mode arithmetic element is defeated with target instruction target word generation unit
Outlet is connected, and the input terminal on the second tunnel of override operating mode arithmetic element is connected with the output end of wattful power messurement unit, override
The third road input terminal of operating mode arithmetic element is connected with the output end of unit actual load instruction generation unit, rate switch unit
Switching switch be connected with the output end of override operating mode arithmetic element, the first via input terminal and target of load instruction switch unit
The output end of instruction generation unit is connected, and the second road input terminal of load instruction switch unit is defeated with wattful power messurement unit
Outlet is connected, and the switching switch of load instruction switch unit is connected with the output end of override operating mode arithmetic element, rate control list
The rate setpoints of member are connected with the output end of rate switch unit, and the input terminal of Rate control unit and load instruction switching are single
The output end of member is connected, and the input terminal of unit actual load instruction generation unit is connected with the output end of Rate control unit.
Target instruction target word generation unit is configured with filter circuit and gamma correction circuit, the transmission for eliminating order circuit
Error and interference signal.
Override operating mode arithmetic element instructs for receiving target instruction target word, active power and unit actual load and carries out logic
Operation meets " unit actual load instruction during load up>Active power>The condition of target instruction target word ", or in load down
Meet " unit actual load instruction in the process<Active power<The condition of target instruction target word " then judges that override operating mode is set up.
When override operating mode is set up, the output valve of load instruction switch unit is switched to active power；When override operating mode disappears
When mistake, the output valve delay 1s of load instruction switch unit is restored to target instruction target word.
Rate switch unit realizes load change rate handoff functionality, when override operating mode is set up, rate switch unit
Output valve is switched to override rate；When override operating mode disappears, the output valve of rate switch unit is restored to normal speed.
Rate control unit coordinates load instruction switch unit and rate switch unit synchronization action, realizes unit actual negative
Lotus instructs override function, and when override operating mode is set up, the instruction of unit actual load is switched to active power value；When override operating mode
When disappearance, delay 1s restores normal unit actual load instruction.
Unit actual load instruction generation unit be used for receiving velocity control unit output valve, and under reach unit cooperative
Subsystems belonging to control system.
Control method includes the following steps：
1) information is collected, the situation of change that real-time monitoring objective instruction, active power and unit actual load instruct；
2) by comparing the size of active power and the instruction of unit actual load, judgement unit load change direction；
3) according to the judgement of the 2nd step as a result, the size that further relatively target instruction target word is instructed with unit actual load, judgement
Whether the variation direction of target instruction target word and current active power is consistent；
4) according to the judgement of the 3rd step as a result, the size of further relatively target instruction target word and active power, judges override operating mode
It is whether true；
5) instruction of unit actual load has been rapidly switched to as a result, when override operating mode is set up according to the judgement of the 4th step
Work(performance number；
6) when override operating mode disappears, the instruction of unit actual load is restored to normal value after the 1s that is delayed, is completed normal
Load change process.
Present invention is primarily based on following optimization demands：
Such as：The input agc mode operation of a certain electricity power enterprise, target instruction target word (Target) is in advance during load change
When changing direction, active power (Load) following feature is poor, and the AGC response times often exceed " two detailed rules and regulations " regulation time limit
(60s), such as Δ t in Fig. 311/Δt12It is shown, a large amount of examination point is generated thus, and larger economic damage is brought to electricity power enterprise
It loses.
For the above situation, in addition to needing to carry out necessary optimization to Coordinated Control Systems (CCS), while must needle
The characteristic changed at random to AGC instructions takes appropriate measures, and adjusts unit actual load instruction (LDC) in time, shortens AGC and rings
Between seasonable, the reduction AGC response times examine point, and good economic benefit is obtained for electricity power enterprise.
For the demand, as shown in Figure 1, the present invention provides a kind of control system shortening the AGC response times, it is each
The function of unit is as follows：
1)1001：Target instruction target word generation unit, for receiving power grid AGC instructions (Target) and carrying out necessary filtering,
The small size disturbance of order circuit is eliminated, Target stability is kept；Gamma correction circuit is configured, the transmission of order circuit is eliminated
Error ensures the consistency of sending side and receiving side AGC instructions.
2)1002：Wattful power messurement unit takes middle logic to sentence for carrying out three to three tunnel active power (Load) signals
It is disconnected, ensure the reliability of wattful power messurement value, and carry out necessary filtering to eliminate interference signal.
3)1003：Override operating mode arithmetic element, for receiving Target, Load and unit actual load instruction (LDC) simultaneously
Logical operation is carried out, meets LDC during load up>Load>Target conditions, or meet LDC during load down<
Load<Target conditions then judge that override operating mode is set up.
4)1004：Load instruction switch unit realizes load instruction handoff functionality.When override operating mode is set up, output valve
It is switched to Load；When override operating mode disappears, output valve delay 1s is restored to Target.
5)1005：Rate switch unit realizes load change rate handoff functionality.When override operating mode is set up, output valve
It is switched to override rate；When override operating mode disappears, output valve is restored to normal speed.
6)1006：Rate control unit, cooperation load instruction switch unit, rate switch unit synchronization action, realizes LDC
Override function.When override operating mode is set up, LDC is switched into Load values；When override operating mode disappears, delay 1s restores normal
LDC is instructed.
7)1007：Unit actual load instruction generation unit, be used for receiving velocity control unit output valve, and under reach
Subsystems belonging to CCS.
In order to solve the above-mentioned technical problem, as shown in Fig. 2, invention further provides the determination method of override operating mode,
Include the following steps：
(1)S201：Information is collected, and real-time monitoring objective instruction (Target), unit actual electric power (Load), unit are real
The situation of change of border load instruction (LDC)；
(2)S301：Compare the size of LDC and Load, as a result exports to S401；
(3)S302：Compare the size of Target and LDC, as a result exports to S402；
(4)S303：Compare the size of Target and Load, as a result exports to S403；
(5)S401：The signal for receiving S301 is judged to dropping when LDC is less than Load (operating dead zone is set as -1.5MW)
As a result load stage is exported to S501；
(6)S402：Receive S302 signal, when Target be more than LDC (operating dead zone is set as+0.5MW), then judge
Target is load up, is as a result exported to S501；
(7)S403：The signal for receiving S303, when Target is more than Load (operating dead zone is set as+1.5MW), judgement
Target instruction target word is more than current active power, as a result exports to S701；
(8)S501：The output for receiving S401 and S402, carries out the logical operation of "AND", as a result exports to S601；
(9)S601：The output for receiving S501 then judges load down when the decision condition of S401 and S402 meets simultaneously
Target changes direction in advance in the process, as a result exports to S701；
(10)S701：The output for receiving S601 and S403, carries out the logical operation of "AND", as a result exports to S801；
(11)S801：The output for receiving S701 then judges the AGC instructions of load down process when S701 decision conditions meet
Deflecting requires load up, and desired value is more than current active power, and load change direction must change, output result send to
S901；
(12)S304：Compare the size of LDC and Load, as a result exports to S404；
(13)S305：Compare the size of Target and LDC, as a result exports to S405；
(14)S306：Compare the size of Target and Load, as a result exports to S406；
(15)S404：The signal for receiving S304 is determined as when LDC is more than Load (operating dead zone is set as+1.5MW)
As a result the load up stage exports to S502；
(16)S405：Receive S305 signal, when Target be less than LDC (operating dead zone is set as -0.5MW), then judge
Target instruction target word is load down, is as a result exported to S502；
(17)S406：The signal for receiving S306, when Target is less than Load (operating dead zone is set as -1.5MW), judgement
Target instruction target word is less than current active power, as a result exports to S702；
(18)S502：The output for receiving S404 and S405, carries out the logical operation of "AND", as a result exports to S602；
(19)S602：The output for receiving S502 then judges load up when the decision condition of S404 and S405 meets simultaneously
Target changes direction in advance in the process, as a result exports to S702；
(20)S702：Receive the output of S602 and S406, carry out the logical operation of "AND", as a result exports to S802；
(21)S802：The output of S702 is received, when S702 decision conditions meet, then AGC refers to during judging load up
Enable deflecting requirement load down, and desired value is less than current active power, load change direction must change, output result send to
S901；
(22)S901：The output for receiving S801 and S802, carries out the logical operation of "or", sentences when either condition meets
Determine the establishment of override operating mode.
In conjunction with Fig. 3 and Fig. 4, a kind of control system shortening the AGC response times of elaboration is in certain embodiment (unit rated capacity
For 300MW) in play advantageous effect.
Before embodiment application the technology of the present invention, Load response characteristics are as shown in Figure 3 under override operating mode.
1) Fig. 3 is shown, t0Moment, Target vary to 265MW by 250MW, and LDC is according to normal load change rate liter
Load, desired value 265MW, Load follow LDC to change.
2) since CCS regulation qualities are insufficient, the deviation (hereinafter referred to as power deviation) of Load and LDC are gradually increased, t1When
It carves, LDC varies to 263.5MW, and Load varies to 258MW.
3)t1Moment, load up process not yet terminate, and Target varies to 245MW by 265MW, and LDC is according to normal negative
Lotus changes rate and starts load down, desired value 245MW.Due to T1Moment, there are larger power deviation, CCS power governors
Output order will continue to increase, and Load peaks vary to 259MW, the reversed adjustment process of apparent electrical power occurs.
4)t2Moment, Load vary to 256.5MW, relative to t1The variable quantity absolute value of moment Load is 1.5MW, is more than
Load change dead zone (Northwest Grid is defined as 5/1000ths of unit rated load, i.e. 5 ‰ Pe) specified in " two detailed rules and regulations ",
Judgement unit response time timing terminates.
5) t is calculated1Moment and t2Time difference (the Δ t at moment11), hence it is evident that it is more than response time limits value in " two detailed rules and regulations "
(60s)。
6)t1At the moment, because Target shifts to an earlier date deflecting requirement load down during load up, AGC is rung during leading to load down
It transfinites between seasonable, generates examination point.
7) same reason, in t3Moment and t4Moment, because Target shifts to an earlier date deflecting requirement load up during load down,
Lead to AGC response times (Δ t during load up12) transfinite, it generates AGC and examines point.
The problem of for Fig. 3, provides a kind of control system shortening the AGC response times of the present invention, beneficial to effect
Fruit is as shown in Figure 4.
1) Fig. 4 is shown, t0Moment, Target vary to 265MW by 250MW, and LDC is according to normal load change rate liter
Load, desired value 265MW, Load follow LDC to change.
2) since CCS regulation qualities are insufficient, power deviation is gradually increased, t1Moment, LDC vary to 263.5MW, and Load becomes
Move 258MW.
3)t1Moment, load up process not yet terminate, and Target varies to 245MW by 265MW, a kind of contracting of the invention at this time
The control system of short AGC response times will play following effects：
(1) override operating mode arithmetic element monitors：Target steerings require load down during load up, and meet
LDC>Load>Target conditions, override operating mode are set up, and it is 1 that S802, S901 are exported simultaneously in Fig. 2, and judgement override operating mode is set up.
(2) load instruction switch unit receives the instruction of override operating mode arithmetic element, and output valve is no-delayly by Target
It is switched to Load values.
(3) rate switch unit receives the instruction of override operating mode arithmetic element, by load change rate by normal value (6MW/
Min) it is switched to override rate (300MW/Min).
(4) Rate control unit receives the output of load instruction switch unit, rate switch unit as a result, LDC values is fast
Speed is switched to Load values.Such as t in Fig. 41Shown in moment, LDC is rapidly switched to 258MW by 263.5MW.
(5) as power deviation absolute value 1.5MW less than normal, when override operating mode arithmetic element monitors that override operating mode disappears,
Rate switch unit is no-delayly by load change rate recovery to normal value, after being delayed 1 second, the output of load instruction switch unit
Value is restored to Target values by Load, and Rate control unit output valve is restored to normal LDC, completes follow-up normal load and becomes
Dynamic process.
(6) because the present invention provides LDC override functions, t in Fig. 41Moment eliminates rapidly power deviation, CCS power
Adjuster output order changes direction in time, avoids active power and reversely adjusts phenomenon.
(7)t2Moment, Load vary to 256.5MW, relative to t1The variable quantity absolute value of moment Load is 1.5MW, is more than
Load change dead zone specified in " two detailed rules and regulations ", judgement unit response time timing terminate.
(8) t is calculated1Moment and t2Time difference (the Δ t at moment21), hence it is evident that it is less than response time limitation in " two detailed rules and regulations "
It is worth (60s), is effectively shortened the AGC response times of generating set during load down.
4) it similarly acts on, in Fig. 4 t3To t4Period, LDC override functions are sent out during being effectively shortened load up
AGC response times (the Δ t of motor group22)。
5) prior art will appear active power under above-mentioned override operating mode and reversely adjust phenomenon, such as Δ t in Fig. 311/Δ
t12Shown in period, the AGC response times are extended；The present invention uses LDC override functions, active power can be avoided reversely to adjust
Phenomenon, such as Δ t in Fig. 421/Δt22Shown in period, effectively shorten the AGC response times of generating set.Application of the present invention
LDC override functions improve the adaptability that generating set instructs power grid AGC, on the one hand break through grid side AGC optimizations
The limitation of class patented technology improves the AGC response sensitivities of generating set, is more conducive to the stabilization of mains frequency；It is another
Aspect compensates for the deficiency of mains side CCS optimization class patented technologies, can shorten the AGC response times of generating set, substantially drop
Low AGC examines the amount of money, and significant economic benefit is created for generating set.
Below by taking the subcritical thermal power generation units of certain 300MW as an example, illustrate the practical performance of the present invention.
As shown in figure 5, the institute that the present invention may be implemented using the software of DCS is functional.
1)1002：Wattful power messurement unit chooses module 1 and power measurement filter module 2 to form by power measurement three,
Ensure the unfailing performance of electric load measured value, and carries out necessary filtering to eliminate interference signal.By power measurement filter module 2
Unit active power signal (Load) is exported, No. two input terminals of No.1 load instruction tracking module 8 are transmitted to.
2)1001：Target instruction target word generation unit, by AGC instructions first-order filtering module 3, AGC instruction second-order filters module 4,
AGC instruction gamma corrections module 5, load instruction manually set module 6, target load instruction handover module 7, No.1 load and refer to
Enable 8, No. two load instruction tracking modules 9 of tracking module, load instruction lower limit set module 10, load instruction upper limit setting module
11, load instruction lower limit limitation module 12 and load instruction ceiling restriction module 13 form.AGC instructs 3 He of first-order filtering module
AGC instructs second-order filter module 4 to complete AGC and instructs filter function, eliminates the small size interference signal of order circuit, filtering time point
0.5s is not set as it.Multistage function can be arranged in AGC instruction gamma corrections module 5, and the experiment knot exchanged is remotely controlled according to AGC
Fruit fills in corresponding functional value, can eliminate the transmission error of order circuit, and it is consistent to ensure that receiving side is instructed with sending side
Property.Load instruction manually sets module 6 and is manually set for genset operation personnel's load instruction, only in the non-operation sides AGC
Under formula effectively.Target load instruction handover module 7, No.1 load instruction tracking module 8 and No. two load instruction tracking modules 9 are real
Existing following function of the target instruction target word when the method for operation switches.Load instruction lower limit set module 10, the setting of the load instruction upper limit
Module 11, load instruction lower limit limitation module 12 and load instruction ceiling restriction module 13 realize load instruction amplitude limit up and down jointly
Function.By the 13 output load target instruction target word (Target) of load instruction ceiling restriction module, it is transmitted to load instruction handover module
36 No.1 input terminal.
3)1005：Rate switch unit, by load change rate setup module 14, No.1 constant function block 15, load speed
16, No. two constant function blocks 17 of rate level-one handover module and load rate two level handover module 18 form.Load change rate is set
Set the setting that module 14 changes rate for normal duty.No.1 constant function block 15 and load rate level-one handover module 16 are real
Existing load change/stopping handoff functionality.No. two constant function blocks 17 change the setting of rate for load override.Load rate two
Grade handover module 18 realizes load instruction normal variation rate and override rate handoff functionality, when override operating mode is set up, load
The no-delay override that is switched to of the output of rate two level handover module 18 changes rate (300MW/Min), when override operating mode disappears,
The output of load rate two level handover module 18 is no-delay to be restored to normal variation rate (6MW/Min).Load rate two level is cut
Mold changing 18 output signal of block is transmitted to the No.1 input terminal and No. two input terminals of rate limit blocks 37.
4)1003：Override operating mode arithmetic element limits 20, No. two subtracters of judgment module by No.1 subtracter 19, No.1 height
21, the high limit lower bound of subtracter 25, two of judgment module 24, four of the subtracter 23, two of No.1 lower bound judgment module 22, three is sentenced
Disconnected high limit judgment module 28, six subtracter 29, three lower bound judgment module 30, the No.1 of the subtracter 27, three of module 26, five
The condition judgment module 33 of condition judgment module 32, three of condition judgment module 31, two and No. four condition judgment modules 34 form.
No.1 subtracter 19 realizes S303 logic judging functions in Fig. 2.No.1 height limits judgment module 20 and realizes S403 logic judgments in Fig. 2
It is+1.5 that function, wherein No.1 height, which limit 20 set action dead zone of judgment module,.No. two subtracters 21 realize that S301 logics are sentenced in Fig. 2
Disconnected function.No.1 lower bound judgment module 22 realizes S401 logic judging functions in Fig. 2,22 set action of No.1 lower bound judgment module
Dead zone is -1.5.No. three subtracters 23 realize S302 logic judging functions in Fig. 2.No. two high limit judgment module 24 is realized in Fig. 2
S402 logic judging functions, wherein No. two 24 set action dead zones of high limit judgment module are+0.5.No. four subtracters 25 realize Fig. 2
Middle S306 logic judging functions.No. two lower bound judgment modules 26 realize S406 logic judging functions in Fig. 2, wherein No. two lower bounds are sentenced
Disconnected 26 set action dead zone of module is -1.5.No. five subtracters 27 realize S304 logic judging functions in Fig. 2.No. three high limit judges
Module 28 realizes S404 logic judging functions in Fig. 2, and No. three 28 set action dead zones of high limit judgment module are+1.5.No. six subtractions
Device 29 realizes S305 logic judging functions in Fig. 2.No. three lower bound judgment modules 30 realize S405 logic judging functions in Fig. 2,
In No. three 30 set action dead zones of lower bound judgment module be -0.5.No.1 condition judgment module 31 realize Fig. 2 in S502, S602,
S702 and S802 logic judging functions.No. two condition judgment modules 32 realize that S501, S601, S701 and S801 logic are sentenced in Fig. 2
Disconnected function.No. three condition judgment modules 33 and No. four condition judgment modules 34 realize S901 logic judging functions in Fig. 2, by No. four
Condition judgment module 34 exports the judgement of override operating mode as a result, being transmitted to 18 switching condition input terminal of load rate two level handover module
With the signal input part of delay turn-off time control module 35.
5)1004：Load instruction switch unit, by turn-off time control module 35 and the load instruction handover module 36 of being delayed
Composition.The turn-off time control module 35 that is delayed receives the output letter of No. four condition judgment modules 34 in override operating mode arithmetic element
Number, have the function of that instantaneous make delay 1s is disconnected, outputs signal to load instruction handover module 36.When override operating mode is set up
When, 36 output valve of load instruction handover module is no-delay to be switched to Load values, when override operating mode disappears, is delayed after 1s, load
Instruction 36 output valve of handover module is restored to Target values.36 output valve of load instruction handover module is transmitted to rate limit blocks
37 input terminal.
6)1006：Rate control unit is made of rate limit blocks 37.When generating set, which is in CCS modes, to be run,
37 output valve of rate limit blocks changes the output valve that rate is equal to load rate two level handover module 18.When override operating mode is set up
When, 37 output valve of rate limit blocks switches to Load values according to override rate (300MW/Min), when override operating mode disappears,
It is delayed after 1s, 37 output valve of rate limit blocks changes extremely using current Load values as starting point according to normal speed (6MW/Min)
Target values.
7)1007：Unit actual load instruction generation unit, receiving velocity limitation 37 output valve of module and under to reach CCS each
A subsystem.When override operating mode is set up, LDC switches to Load values according to override rate (300MW/Min), when override operating mode disappears
It when mistake, is delayed after 1s, LDC is changed according to normal speed (6MW/Min) to Target values using current Load values as starting point, complete
At follow-up normal load change process.
Before embodiment application the relevant technologies of the present invention, a large amount of examination point of generation because the AGC response times often transfinite,
Statistics Implementation example in March, 2017 power grid " two detailed rules and regulations " examination data is as shown in table 1.1 data of table are shown, in March, 2017
13 days 18:On 00~March 23 23:During 00,46 examination points are produced altogether because the AGC response times transfinite, the examination amount of money reaches
230000 yuan (46*5*1000=230000), the per day examination amount of money are 2.3 ten thousand yuan.
After embodiment application the relevant technologies of the present invention, the AGC response times examine and are a little greatly decreased.Statistics Implementation example 2017
Year October power grid " two detailed rules and regulations " examination data is as shown in table 2.2 data of table were shown, 01 day 14 October in 2017:00~10
On the moon 27 0:During 00,25 examination points are produced altogether because the AGC response times transfinite, the examination amount of money reaches 12.5 ten thousand yuan of (25*5*
1000=230000), the per day examination amount of money is 0.48 ten thousand yuan.
After embodiment application the relevant technologies of the present invention, because AGC response time performance assessment criteria is substantially improved, the amount of money is daily examined
0.48 ten thousand yuan are dropped to by 2.3 ten thousand yuan, decreases by 79.13%, it is more than 500,000 yuan monthly to reduce or remit the AGC examination amount of money, is embodiment
Annual economical benefit is created up to 6,000,000 yuan.
1 embodiment of table applies preceding AGC examination datas statistical form
2 embodiment of table applies rear AGC examination datas statistical form
Although the present invention is disclosed as above with embodiment, it is not limited to protection scope of the present invention, any to be familiar with
The technical staff of this technology changes and retouches made by without departing from the spirit and scope of the invention, should all belong to this hair
Bright protection domain.
Claims (8)
1. a kind of control system shortening the AGC response times, including：Target instruction target word generation unit, surpasses wattful power messurement unit
Operating mode of speeding arithmetic element, load instruction switch unit, rate switch unit, Rate control unit and the instruction life of unit actual load
At unit；It is characterized in that, the input terminal of the first via of the override operating mode arithmetic element and target instruction target word generation unit is defeated
Outlet is connected, and the input terminal on the second tunnel of the override operating mode arithmetic element is connected with the output end of wattful power messurement unit,
The third road input terminal of the override operating mode arithmetic element is connected with the output end of unit actual load instruction generation unit, described
The switching switch of rate switch unit is connected with the output end of override operating mode arithmetic element, and the of the load instruction switch unit
Input terminal is connected with the output end of target instruction target word generation unit all the way, the second road input terminal of the load instruction switch unit with
The output end of wattful power messurement unit is connected, switching switch and the override operating mode arithmetic element of the load instruction switch unit
Output end be connected, the rate setpoints of the Rate control unit are connected with the output end of rate switch unit, the rate
The input terminal of control unit is connected with the output end of load instruction switch unit, the unit actual load instruction generation unit
Input terminal is connected with the output end of Rate control unit.
2. the control system according to claim 1 for shortening the AGC response times, which is characterized in that the target instruction target word life
It is configured with filter circuit and gamma correction circuit at unit, transmission error and interference signal for eliminating order circuit.
3. the control system according to claim 1 for shortening the AGC response times, which is characterized in that the override operating mode fortune
It calculates unit and instructs and carry out logical operation for receiving target instruction target word, active power and unit actual load, in load up process
It is middle to meet " unit actual load instruction>Active power>The condition of target instruction target word ", or meet " unit reality during load down
Border load instruction<Active power<The condition of target instruction target word " then judges that override operating mode is set up.
4. the control system according to claim 1 for shortening the AGC response times, which is characterized in that when override operating mode is set up
When, the output valve of the load instruction switch unit is switched to active power；When override operating mode disappears, the load instruction is cut
The output valve delay 1s for changing unit is restored to target instruction target word.
5. the control system according to claim 1 for shortening the AGC response times, which is characterized in that the rate switching is single
Member realizes load change rate handoff functionality, and when override operating mode is set up, the output valve of rate switch unit is switched to override speed
Rate；When override operating mode disappears, the output valve of rate switch unit is restored to normal speed.
6. the control system according to claim 1 for shortening the AGC response times, which is characterized in that the rate control list
Member cooperation load instruction switch unit and rate switch unit synchronization action realize that unit actual load instructs override function, when
When override operating mode is set up, the instruction of unit actual load is switched into active power value；When override operating mode disappears, delay 1s restores
Normal unit actual load instruction.
7. the control system according to claim 1 for shortening the AGC response times, which is characterized in that the unit actual negative
Lotus instruction generation unit be used for receiving velocity control unit output valve, and under reach each belonging to Coordinated Control Systems
Subsystem.
8. a kind of controlling party of the control system of shortening AGC response times as described in any one of claim 1-7 claims
Method, which is characterized in that the control method includes the following steps：
1) information is collected, the situation of change that real-time monitoring objective instruction, active power and unit actual load instruct；
2) by comparing the size of active power and the instruction of unit actual load, judgement unit load change direction；
3) according to the judgement of the 2nd step as a result, the size that further relatively target instruction target word is instructed with unit actual load, judges target
Whether instruction is consistent with the variation direction of current active power；
4) according to the judgement of the 3rd step as a result, further comparing the size of target instruction target word and active power, whether judgement override operating mode
It sets up；
5）According to the judgement of the 4th step as a result, when override operating mode is set up, the instruction of unit actual load is rapidly switched to wattful power
Rate value；
6）When override operating mode disappears, the instruction of unit actual load is restored to normal value after the 1s that is delayed, completes normal load
Change process.
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| CN113541208A (en) * | 2021-06-10 | 2021-10-22 | 华电电力科学研究院有限公司 | Coal-fired unit primary frequency modulation adjustment performance diagnosis and self-adaptive adjustment system |
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