CN104578078B - One kind prevents the reverse adjuster of primary frequency modulation - Google Patents
One kind prevents the reverse adjuster of primary frequency modulation Download PDFInfo
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- CN104578078B CN104578078B CN201510072922.8A CN201510072922A CN104578078B CN 104578078 B CN104578078 B CN 104578078B CN 201510072922 A CN201510072922 A CN 201510072922A CN 104578078 B CN104578078 B CN 104578078B
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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
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Abstract
The reverse adjuster of primary frequency modulation is prevented the invention discloses one kind, it includes output loop, primary frequency modulation walking direction loop, primary frequency modulation action judge that loop and AGC actions judge that loop judges that loop is connected with the selection of unit target power, and the selection of unit target power judges that loop is connected with output loop；The present invention is solved prior art and is maintained the generating set primary frequency regulation control system of mains frequency stable existence imperfect due to what is designed using primary frequency modulation technology, the all operating modes occurred in production process are not adapted to, mains frequency is caused to change the changed power effect actual with generating set primary frequency regulation action of corresponding power demand opposite, the problems such as finally exacerbating the unstability of mains frequency, solve the changed power effect that mains frequency changes corresponding power demand with generating set primary frequency regulation acts reality opposite, the problems such as influence power system mains frequency stabilization of presence.
Description
Technical field
The invention belongs to prevent primary frequency regulation of power network from reversely adjusting control technology, more particularly to one kind prevents primary frequency modulation anti-
To adjuster.
Background technology
In power production process, the stabilization of power system mains frequency is ensured, be the top priority in power generation, it
It is related to the reliability and national economy of power supply.Once mains frequency unstability, will cause mains frequency to collapse, cause power system
Large-area power-cuts.There are strict requirements in China for operation of power networks frequency and its error range, relies primarily on primary frequency modulation technology
Maintain mains frequency stabilization.Primary frequency regulation of power network refers to the change of mains frequency after normal range (NR) of the mains frequency beyond regulation
Change will make the governing system of each generating set that primary frequency modulation is participated in power network automatically increased according to the change of mains frequency or
Reduce the power of unit, so as to reach new balance, and the change of mains frequency is limited in the error range of regulation.It is existing
Some generating set primary frequency regulation control systems are imperfect due to design, and tend not to adapt to occur in production process is all
Operating mode, causes mains frequency to change the corresponding power demand changed power actual with generating set primary frequency regulation action and acts on phase
Instead, the unstability of mains frequency is finally exacerbated, unit actual power is led in generation current unit primary frequency modulation control system
Power of the assembling unit instruction control is crossed, the power of the assembling unit is instructed by unit target power and primary frequency modulation amount（After mains frequency changes
It is required that the power variation of generating set output）It is formed by stacking, and unit target power is only from unit and calculates power.Work as electricity
Unit power instruction is consistent with unit target power, unit calculating power during net frequency stabilization, after mains frequency changes
The primary frequency modulation amount for causing is directly superimposed with unit target power, output power of the assembling unit instruction.But because unit calculates power
（Unit target power）There is dynamic deferred property with unit actual power, the two numerical value can not possibly be consistent at the moment, cause to work as
When mains frequency requirement unit increaseds or decreases power, once now unit calculates power（Unit target power）It is less than or greater than
Unit actual power so that be superimposed the power of the assembling unit instruction of primary frequency modulation amount still less than or more than unit actual power, made
Continue requirement into power of the assembling unit instruction and the power of the assembling unit is reduced or increased, power demand corresponding with mains frequency change acts on phase
Instead, the unstability of mains frequency is finally exacerbated.
The content of the invention
The technical problem to be solved in the present invention：There is provided one kind prevents the reverse adjuster of primary frequency modulation, to solve prior art
The generating set primary frequency regulation control system of mains frequency stable existence is maintained using primary frequency modulation technology due to designing not
Completely, it is impossible to adapt to all operating modes occurred in production process, cause mains frequency to change corresponding power demand and generator
The actual changed power effect of group primary frequency modulation action is conversely, the problems such as finally exacerbating the unstability of mains frequency.
Technical solution of the present invention：
One kind prevents the reverse adjuster of primary frequency modulation, and it includes output loop, primary frequency modulation walking direction loop, once adjusts
Frequency action judges that loop and AGC actions judge that loop judges that loop is connected with the selection of unit target power, the choosing of unit target power
Select and judge that loop is connected with output loop.
Primary frequency modulation walking direction loop includes the input company of the first general election module, mains frequency and the first general election module
Connect, the output end of the first general election module is divided into two tunnels, and the first via is connected with first with the second input of module, and the second tunnel passes through
First negate module after be connected with second with the second input of module, power of the assembling unit instruction and unit actual power are respectively with the
The input connection of one subtraction block, the output end of the first subtraction block is divided into two tunnels, and the first via is by after second largest modeling block
Be connected with first with the first input end of module, the second tunnel by after the first small modeling block with second with the first input end of module
Connection, first is connected with the first OR gate input respectively with module and second with the output end of module.
Primary frequency modulation action judges that loop includes the first size modeling block, the input of mains frequency and the first size modeling block
End connection, the first size modeling block output end respectively with the 3rd with the first input end and the input of the first time delay module of module
Connection, the input that the output end of the first time delay module negates module with second is connected, and second negates the output end and the of module
Three are connected with the second input of module, and primary frequency function has put into signal and has been connected with the 3rd with the 3rd input of module.
AGC actions judge that loop includes the second subtraction block, and dispatching of power netwoks instruction and the power of the assembling unit are instructed respectively with second
The input connection of subtraction block, the output end of the second subtraction block input respectively with the 3rd modeling block high and the second small choosing
The input connection of module, the output end of the second small modeling block is connected with the 4th with the first input end of module, the 3rd modeling high
The output end of block is connected with the 5th with the first input end of module, and it is defeated with the second of module with the 4th respectively that AGC has put into signal
Enter end and the 5th be connected with the second input of module, the 4th and module output end and the 5th and module output end respectively with
The input connection of the second OR gate, the output end of the second OR gate negates module input and is connected with the 3rd.
The selection of unit target power judges that loop includes handover module, Y inputs and the unit actual power of handover module
Connection, N inputs and the unit of handover module calculate power and are connected, switching control end and the selection Rule of judgment letter of handover module
The connection of number input.
Selection Rule of judgment signal is primary frequency modulation walking direction loop, primary frequency modulation action judges loop and AGC actions
Judge loop output signal and signal.
Beneficial effects of the present invention：
The present invention using primary frequency modulation walking direction loop, primary frequency modulation action judge loop, AGC act judge loop,
The selection of unit target power judges loop, when the primary frequency modulation walking direction of the condition judged as the selection of unit target power is returned
Road, primary frequency modulation action judge that loop, AGC are acted when judging that the output in loop is " 1 ", i.e. mains frequency changes requirement
When generating set primary frequency regulation is acted, control system is judged primary frequency modulation direction, and unit target power selects current machine
Group actual power is superimposed with primary frequency modulation amount as initial value, output power of the assembling unit instruction, regulator generator group power output,
Avoid because intrinsic unit calculates power（Unit target power）The once tune for causing inconsistent with unit actual power
The reverse adjustment effect of frequency, is effectively improved the accuracy and reliability of generating set dynamic regulation mains frequency, improves electricity
The security and stability of Force system operation；The present invention is solved prior art and mains frequency stabilization is maintained using primary frequency modulation technology
The generating set primary frequency regulation control system of presence is imperfect due to design, it is impossible to adapt to all works occurred in production process
Condition, causes mains frequency to change the corresponding power demand changed power actual with generating set primary frequency regulation action and acts on phase
Instead, the problems such as finally exacerbating the unstability of mains frequency, solves mains frequency and changes corresponding power demand and generate electricity
The problems such as influence power system mains frequency stabilization that the actual changed power effect of unit primary frequency modulation action conversely, there exist.
Brief description of the drawings：
Fig. 1 is schematic structural view of the invention；
Fig. 2 is primary frequency modulation walking direction loop structure schematic diagram of the present invention；
Fig. 3 is that primary frequency modulation of the present invention action judges loop structure schematic diagram；
Fig. 4 is that AGC of the present invention actions judge loop structure schematic diagram；
Fig. 5 is that unit target power of the present invention selection judges loop structure schematic diagram.
Specific embodiment
One kind prevents the reverse adjuster of primary frequency modulation, and it includes that primary frequency modulation walking direction loop, primary frequency modulation action are sentenced
Disconnected loop, AGC actions judge that loop, the selection of unit target power judge loop and output loop, and primary frequency modulation walking direction is returned
Road, primary frequency modulation action judge that loop and AGC actions judge that loop judges that loop is connected with the selection of unit target power, unit mesh
Mark power selection judges that loop is connected with output loop.
Primary frequency modulation walking direction loop, according to mains frequency, power of the assembling unit instruction and unit actual power, judges power network
When frequency changes, the direction of action and unit of grid requirements generating set primary frequency regulation direction of action in itself whether one
Cause；Input signal is also turbine speed including mains frequency（Power network actual frequency）, the power of the assembling unit instruction and the actual work(of unit
Rate, turbine speed（Power network actual frequency）With power network rated frequency, power of the assembling unit instruction and unit actual power by comparing
Size, if power network actual frequency reduces the power of the assembling unit more than power network rated frequency explanation grid requirements generating set, and now
Power of the assembling unit instruction increases the power of the assembling unit more than the explanation generating set requirement of unit actual power, and now primary frequency control system is present
Reverse adjustment effect, exports " 1 " signal.If instead power network actual frequency generates electricity less than power network rated frequency explanation grid requirements
Unit increases the power of the assembling unit, and now power of the assembling unit instruction reduces unit work(less than the explanation generating set requirement of unit actual power
Rate, now primary frequency control system there is reverse adjustment effect, export " 1 " signal.
Its internal structure is constituted（See Fig. 2）Primary frequency modulation walking direction loop include the first general election module 1, mains frequency with
The input connection of the first general election module 1, the output end of the first general election module 1 is divided into two tunnels, the first via with first with module 6
Second input is connected, and the second tunnel is connected after negating module 2 by first with second with the second input of module 7, unit work(
Rate is instructed and input of the unit actual power respectively with the first subtraction block 3 is connected, and the output end of the first subtraction block 3 is divided into
Two tunnels, the first via is connected by after second largest modeling block 5 with first with the first input end of module 6, and the second tunnel is small by first
Be connected with second with the first input end of module 7 after modeling block 4, first with the output end of module 6 and second and module 7 respectively with
The input of first OR gate 8 is connected.
" H " module is the first general election module 1 in Fig. 2, if grid frequency value is more than the setting value in " H " module（Power network volume
Determine frequency）, then output signal is " 1 ", otherwise output signal is " 0 ", and mains frequency i.e. turbine speed are analog quantity, are connect
Enter the first general election module 1, the setting value the present embodiment in the first general election module 1 is set to 3002r/min, and grid requirements power network is specified
Frequency is 50Hz, that is, 3000r/min, and change dead band is ± 2 r/min, if mains frequency changes more than 3002r/
Min or less than 2998r/min, it is desirable to which generating set carries out primary frequency modulation to balance mains frequency, more than 3002r/min requirements
Unit reduces power, increases power less than 2998r/min requirement units, if mains frequency is more than 3002r/min, " first
General election module 1 is output as " 1 "；Fig. 2 " N " module negates module 2 for first, if input is " 1 ", is output as " 0 "；As being input into
It is " 0 " to be then output as " 1 "；" ∑ " module is the first subtraction block 3 in figure, and power of the assembling unit instruction is minuend, unit reality
Power is subtrahend；" L " module be the first small modeling block 4, function acted on second largest modeling block 5 conversely, input value if less than
Module setting value, then be output as " 1 "；
The second largest definite value of modeling block 5 is 0.1, and the module definite value of the first small modeling block 4 is 0.1；
First with module 6 and second and module 7, during input signal all " 1 ", output signal is " 1 "；There is an input
Signal is input into during for " 0 " more than an input signal, and output signal is " 0 "；
First OR gate 8, during input signal all " 0 ", output signal is " 0 "；There is an input signal or more than one
When input signal input is for " 1 ", output signal is " 1 "；
The effect in primary frequency modulation walking direction loop is, when mains frequency requirement generating set increases power, if this
When unit power instruction be more than unit actual power, represent that unit requires to reduce power in itself, with grid requirements primary frequency modulation side
To conversely, i.e. be output as " 1 ", as unit target power below selection judge one of loop condition；Vice versa.
Primary frequency modulation action judges loop, and signal has been put into according to mains frequency and primary frequency function, judges generator
Group primary frequency control system working condition.
Primary frequency modulation action judges that loop includes（See Fig. 3）First size modeling block 11, in the first size modeling block 11
Setting value the present embodiment is set to 3002r/min, 2998 r/min, and grid requirements power network rated frequency is 50Hz, that is,
3000r/min, change dead band is ± 2 r/min, if mains frequency changes more than 3002r/min or less than 2998r/
Min, it is desirable to which generating set carries out primary frequency modulation to balance mains frequency, power is reduced more than 3002r/min requirement units, small
Increase power in 2998r/min requirement units, if mains frequency is more than 3002r/min or less than 2998 r/min, " first
Size modeling block 1 is output as " 1 "；Mains frequency is connected with the input of the first size modeling block 11, the first size modeling block 11
Output end is connected with the 3rd with the first input end of module 14 and the input of the first time delay module 12 respectively, the first time delay module
The input that 12 output end negates module 13 with second is connected, second negate the output end of module 13 with the 3rd with module 14
Second input is connected, and primary frequency function has put into signal and has been connected with the 3rd with the 3rd input of module 14.
Primary frequency modulation action judges that the effect in loop is to have put into signal according to mains frequency and primary frequency function, sentences
Break when generating set primary frequency regulation system has put into operation, if now mains frequency fluctuation, that is, mains frequency is more than
3002r/min or less than 2998r/min, then generating set primary frequency regulation starts action, that is, be output as " 1 ", but if once
Frequency modulation action continuously continues 60s, and output is changed into " 0 ", and the effect for being changed into " 0 " is if mains frequency continued jitters 60s, now recognizes
It is primary frequency modulation overlong time, the generating set should not up to have frequency modulation effect, cancels loop effect, by Power Plant DCS control
System controls original Primary Frequency Modulation Loop to be adjusted.This is designed as having taken into full account unit whole operating condition, in reality
Never occur mains frequency in operation and continue to exceed the situation that 60s is adjusted to same direction, this function increases as miscellaneous function
Plus it is of the invention comprehensive.
AGC actions judge loop, are instructed according to dispatching of power netwoks instruction and the power of the assembling unit, it is determined that preventing reverse regulatory function
Whether put into operation.
AGC actions judge loop（See Fig. 4）Including the second subtraction block 21, dispatching of power netwoks instruction and power of the assembling unit instruction divide
Input not with the second subtraction block 21 is connected, and the output end of the second subtraction block 21 is defeated with the 3rd modeling block 22 high respectively
The input for entering end and the second small modeling block 23 is connected, and the output end of the second small modeling block 23 is defeated with the first of module 24 with the 4th
Enter end connection, the output end of the 3rd modeling block 22 high is connected with the 5th with the first input end of module 25, and AGC has put into signal point
Be not connected with the second input of module 25 with the 4th with the second input of module 24 and the 5th, the 4th with the output of module 24
End and the 5th input with the output end of module 25 respectively with the second OR gate 26 are connected, the output end and the 3rd of the second OR gate 26
Negate the connection of the input of module 27.
AGC actions judge that the effect in loop is, in the case where AGC functions put into, if dispatching of power netwoks instruction more than or
Instructed less than the power of the assembling unit, then it represents that now grid requirements unit increases or decreases load, i.e. AGC Function on Generator Set and acts,
Require that AGC functions are not operating after negated, the figure logic is output as " 1 ", mean that power network AGC and primary frequency function are equally to adjust
The section power of the assembling unit, is likely to occur conflict under different operating modes, and this logic has taken into full account above possibility, is taken when AGC is acted
Disappear loop effect, is adjusted by the original Primary Frequency Modulation Loop of system.
The selection of unit target power judges loop, is judged back according to primary frequency modulation walking direction loop, primary frequency modulation action
Road, AGC actions judge the output signal in loop, draw unit target power.
The selection of unit target power judges loop（See Fig. 5）Including handover module 31, the Y inputs and machine of handover module 31
Group actual power connection, the N inputs of handover module 31 calculate power and are connected with unit, the switching control end of handover module 31 and
The signal input part connection of selection Rule of judgment.Selection Rule of judgment signal is primary frequency modulation walking direction loop, primary frequency modulation is moved
Work judges that loop and AGC act judge loop output signal and signal.
The selection of unit target power judges that the effect in loop is, when selecting Rule of judgment to meet for " 1 ", unit target work(
Rate is unit actual power；When selecting Rule of judgment to meet for " 0 ", unit target power is that unit calculates power；Switching mould
Block 31 sets switching rate 6MW/min, and input value is changed with the speed of 6MW per minute when representing that " Y " is switched to " N ", prevents
Disturbance is produced, causes the power of the assembling unit to fluctuate, the selection of unit target power judges that the final output value in loop is exactly to prevent from once adjusting
The output valve unit target power that frequency is reversely adjusted.
Output loop, tele-control system is passed through by the unit target power that the selection of unit target power judges loop output
It is superimposed with the primary frequency modulation amount of grid requirements, the output power of the assembling unit is instructed and adjusts unit power output, long-range control to generating set
System processed is the DCS control systems of power plant.
Claims (3)
1. one kind prevents the reverse adjuster of primary frequency modulation, and it includes output loop, it is characterised in that：Primary frequency modulation walking direction is returned
Road, primary frequency modulation action judge that loop and AGC actions judge that loop judges that loop is connected with the selection of unit target power, unit mesh
Mark power selection judges that loop is connected with output loop；Primary frequency modulation walking direction loop includes the first general election module（1）, power network
Frequency and the first general election module（1）Input connection, the first general election module（1）Output end be divided into two tunnels, the first via and the
One and module（6）The second input connection, the second tunnel negates module by first（2）Afterwards with second and module（7）Second
Input connect, the power of the assembling unit instruction and unit actual power respectively with the first subtraction block（3）Input connection, first subtracts
Method module（3）Output end be divided into two tunnels, the first via is by second largest modeling block（5）Afterwards with first and module（6）It is first defeated
Enter end connection, the second tunnel is by the first small modeling block（4）Afterwards with second and module（7）First input end connection, first and mould
Block（6）With second and module（7）Output end respectively with the first OR gate（8）Input is connected, the first OR gate（8）Output end be
The output end in primary frequency modulation walking direction loop；Primary frequency modulation action judges that loop includes the first size modeling block（11）, power network
Frequency and the first size modeling block（11）Input connection, the first size modeling block（11）Output end respectively with the 3rd and module
（14）First input end and the first time delay module（12）Input connection, the first time delay module（12）Output end and second
Negate module（13）Input connection, second negates module（13）Output end and the 3rd and module（14）The second input
Connection, primary frequency function has put into signal and the 3rd and module（14）The connection of the 3rd input, the 3rd and module（14）'s
Output end is the output end that primary frequency modulation action judges loop；AGC actions judge that loop includes the second subtraction block（21）, power network
Dispatch command and the power of the assembling unit instruction respectively with the second subtraction block（21）Input connection, the second subtraction block（21）It is defeated
Go out end respectively with the 3rd modeling block high（22）Input and the second small modeling block（23）Input connection, the second small modeling block
（23）Output end and the 4th and module（24）First input end connection, the 3rd modeling block high（22）Output end with the 5th with
Module（25）First input end connection, AGC put into signal respectively with the 4th and module（24）The second input and the 5th
With module（25）The connection of the second input, the 4th and module（24）Output end and the 5th and module（25）Output end difference
With the second OR gate（26）Input connection, the second OR gate（26）Output end and the 3rd negate module（27）Input is connected,
3rd negates module（27）Output end judge the output end in loop for AGC actions.
2. one kind according to claim 1 prevents the reverse adjuster of primary frequency modulation, it is characterised in that：Unit target power is selected
Select and judge that loop includes handover module (31), handover module（31）Y inputs be connected with unit actual power, handover module
（31）N inputs and unit calculate power and be connected, handover module（31）Switching control end connect with selection Rule of judgment signal
Connect, handover module（31）Output end output unit target power.
3. one kind according to claim 2 prevents the reverse adjuster of primary frequency modulation, it is characterised in that：Selection Rule of judgment letter
Number for primary frequency modulation walking direction loop, primary frequency modulation action judge loop and AGC act judge loop output signal with letter
Number.
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| CN105870943B (en) * | 2016-05-18 | 2018-05-04 | 国网山东省电力公司电力科学研究院 | Fired power generating unit primary frequency modulation control system and method based on safe and stable operation |
| CN107592055A (en) * | 2017-08-16 | 2018-01-16 | 华润电力（贺州）有限公司 | A kind of method that motor frequency conversion regulation oscillation point excision is realized on DCS |
| CN111193275B (en) * | 2020-01-21 | 2021-01-19 | 常剑飞 | Method for improving primary frequency modulation action effect of generator set |
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| CN102074957B (en) * | 2010-12-24 | 2013-06-05 | 中国长江三峡集团公司 | Primary frequency regulation and automatic generation control (AGC) load regulation coordinated control method |
| CA2889254C (en) * | 2012-12-07 | 2018-11-27 | Battelle Memorial Institute | Direct load control frequency regulation support system |
| CN103777556B (en) * | 2014-02-12 | 2016-08-17 | 国家电网公司 | The preferential control method of monoblock primary frequency modulation and system |
| CN104269871B (en) * | 2014-10-27 | 2016-06-08 | 国家电网公司 | Improve the method for the correct action qualification rate of thermal power generation unit primary frequency modulation |
| CN204615390U (en) * | 2015-02-12 | 2015-09-02 | 贵州电力试验研究院 | One prevents the reverse adjuster of primary frequency modulation |
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