CN208401559U - Net source primary frequency modulation regulator control system based on power grid reference frequency deviation - Google Patents
Net source primary frequency modulation regulator control system based on power grid reference frequency deviation Download PDFInfo
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Abstract
The utility model discloses a kind of net source primary frequency modulation regulator control system based on power grid reference frequency deviation, which includes multiplier, rest-set flip-flop, height clipping module, height alarm module, analog quantity switch and quality judgment module；Multiplier input receives the mains frequency deviation signal that network system issues, and supreme low clip module input is exported after multiplying；It is exported after high low clip to the first input end of analog quantity switch；Height alarm module input terminal receives the mains frequency deviation signal that network system issues, and exports after just alarming to trigger set end；The input terminal of quality judgment module receives the mains frequency deviation signal that network system issues, and is exported after quality judges to the reset terminal of rest-set flip-flop；Second input terminal of analog quantity switch receives speed error signal；The set end of analog quantity switch and the output end of rest-set flip-flop connect；Analog quantity switch output valve to unit carries out primary frequency modulation compensation control.
Description
Technical field
The utility model relates to power grid frequency modulation field more particularly to a kind of net source based on power grid reference frequency deviation are primary
Frequency modulation regulator control system.
Background technique
It is mutual in extra-high voltage grid and large regional grid with the continuous increase of new-energy grid-connected, load growth and power grid scale
Under the new situation, grid contacts at different levels are increasingly close, and the requirement of cooperation is also higher and higher between power grid and unit for connection.Due to
China's power grid thermoelectricity account for it is relatively high, in terms of data in 2015,15.3 hundred million kilowatts of national capacity of installed generator, wherein thermoelectricity 9.9
Hundred million kilowatts, accounting 65.56%, the Primary frequency control ability of power grid is mainly to be realized by fired power generating unit.
Generating set primary frequency regulation function is the intrinsic function of Turbo-generator Set, and unit is mounted on steamer pusher side by it
Rotation-speed measuring device measure actual speed value, carry out asking poor with specified 3000 revs/min, after obtaining revolving speed deviation △ n
Adjust DEH system rapidly by translation operation adjusts door into vapour, using boiler heat storage, in the case where there is exception in power grid,
Load adjustment is carried out with the power notch requirement of responsive electricity grid, electric power grid frequency stabilization maintains the safety of power grid.
Currently, grid dispatching management is mainly derived from energy management system to the primary frequency modulation performance examining computation parameter of unit
It unites (EMS), the measuring points information such as the corresponding frequency of unit, active is defined on wide-area monitoring systems (WAMS) telemetering and defines in table, root
The frequency calculated according to defining telemetry intelligence (TELINT) in WAMS from synchronized phase measurement device (PMU) real-time database and obtaining primary frequency modulation disturbance
The telemetries such as instruction before and after rate, active power, revolving speed, primary frequency modulation.Partial region power grid occurs due to big frequency departure
Number is less, causes effectively monitor the primary frequency modulation performance in fortune unit, therefore existing part province, such as Jiangsu, Shandong
Equal provinces and cities establish unit primary frequency modulation performance remote test system at province regulation center, by periodically adjusting main website side to machine by saving
Group carries out remote frequency disturbance, simulates the generation of large disturbances, realizes active unit performance test, primary to unit to realize
The dynamic of fm capacity monitors.Fig. 1 be net source power control schematic diagram, AGC (Automatic Generation Control) function of power grid mainly according to
It is allocated the Load Regulation amount that unit should bear according to ACE (district control deviation), and ACE=B × Δ f+ Δ P, wherein B system
Number is constant within a certain period of time, and Δ P is mapping of field power difference, and Δ f is frequency departure.
Since the mains frequency in China is 50Hz, this frequency is that electricity is determined in the time that a dextrorotation period is walked
, since f=np/60, p are the number of pole-pairs of motor, and thermal power generation unit is a pair of of grade, therefore relationship is Δ between Δ f and Δ n
N=60 × Δ f.The frequency departure for being used to examine and control for the revolving speed deviation and power grid of primary frequency modulation control due to unit
The data source disunity of value is caused when biggish load fluctuation occurs in power grid, and there are the asynchronisms and amount of unit movement
The otherness of value, can not Effective Regulation fortune unit primary frequency modulation performance, thus when there is mains frequency fluctuation net source movement
The problems such as time disunity and inconsistent movement amplitude.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of based on power grid reference frequency deviation
Net source primary frequency modulation regulator control system, is controlled using the unified a reference value of net source frequency, it is primary to unit to be able to achieve power grid
The unified regulation of frequency modulation, it is ensured that net source actuation time and act the consistent of amplitude, the frequency stabilization of network system is effectively ensured.
The technical scheme adopted by the utility model is
A kind of net source primary frequency modulation regulator control system based on power grid reference frequency deviation, the system include multiplier, RS touching
Send out device, height clipping module, height alarm module, analog quantity switch and quality judgment module；
The input terminal of the multiplier receives the mains frequency deviation signal that network system issues, and exports after multiplying
The input terminal of supreme low clip module；It is exported after high low clip to the first input end of analog quantity switch；
The input terminal of the height alarm module receives the mains frequency deviation signal that network system issues, and is just alarmed
It is exported afterwards to the set end of trigger；
The input terminal of the quality judgment module receives the mains frequency deviation signal that network system issues, and judges through quality
It is exported afterwards to the reset terminal of rest-set flip-flop；
Second input terminal of the analog quantity switch receives speed error signal；The set end and RS of analog quantity switch
The output end of trigger connects；The value of the output end output first input end of the analog quantity switch or the value of the second input terminal
Primary frequency modulation compensation control is carried out to unit.
Further, an input terminal of the multiplier is connect with network system, another input terminal and analog generator
Connection.
Further, the mains frequency that the ceiling value of the height alarm module and lower limit value are issued according to network system is inclined
The maximum value and minimum value of difference signal are set.
Further, the ceiling value of the height clipping module and lower limit value are according to the maximum of fired power generating unit primary frequency modulation amount
Value and minimum value setting.
Compared with prior art, the utility model has the beneficial effects that
(1) since the quality of the primary frequency modulation performance of grid-connected unit directly affects the stabilization of mains frequency, the utility model
It can be controlled by using the unified a reference value of net source frequency, realize unified regulation of the power grid to unit primary frequency modulation,
Unit is improved to the accuracy of mains frequency variation response, it is ensured that the fm capacity of unit reaches the requirement of scheduling appraisal standards；
(2) the utility model passes through the unification of net source frequency signal, realizes the consistent of controlled device, can effectively ensure net
Source actuation time and movement amplitude it is consistent, on the one hand keep unit safe operation, on the other hand can be further improved power grid
The stability of frequency, and then ensure the safely, effectively operation of the electrical equipment and power equipment of users.
Detailed description of the invention
Fig. 1 is net source power control schematic diagram；
Fig. 2 be the utility model proposes based on power grid reference frequency deviation net source primary frequency modulation regulator control system signal
Figure.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal",
The orientation or positional relationship of the instructions such as " side ", "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate chatting
The relative for stating each component of the utility model or component structure relationship and determination, not refer in particular in the utility model either component or
Element should not be understood as limiting the present invention.
In the utility model, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and expression can be fixation
Connection, is also possible to be integrally connected or be detachably connected；It can be directly connected, the indirect phase of intermediary can also be passed through
Even.Related scientific research or technical staff for this field can determine as the case may be above-mentioned term in the present invention
Concrete meaning, should not be understood as limiting the present invention.
As shown in Figure 1, the utility model provides a kind of net source primary frequency modulation regulation based on power grid reference frequency deviation
System decides whether unified regulation in the primary tune of fortune unit according to whether mains frequency deviation signal reaches defined limit value
Frequency load compensation function, meanwhile, the quality of maximum frequency modulation amplitude and signal transmission that unit can bear is taken into account to determine unit
Whether the primary frequency modulation unified regulation of power grid is participated in, to realize net source coordination control.
As shown in Fig. 2, the net source primary frequency modulation regulator control system based on power grid reference frequency deviation includes multiplier MUL, RS
Trigger, height clipping module HLLMT, height alarm module HLALM, analog quantity switch AXSEL, analog generator A and
Quality judgment module TQLT；Wherein:
An input terminal X1 of the multiplier MUL is connect with network system, another input terminal X2 and analog quantity occur
The output end Y of device A connection, the multiplier MUL is connect with the input terminal X of height clipping module HLLMT, the high low clip mould
The output end D of block HLLMT is connect with the first input end X1 of analog quantity switch AXSEL.
The input terminal X1 of the multiplier MUL receives the mains frequency deviation signal Δ f that network system issues, and transports through multiplication
The input terminal X of supreme low clip module HLLMT is exported after calculation；It is exported after high low clip to the first input of analog quantity switch
Hold X1.
The input terminal X of the height alarm module HLALM is connect with network system, the set of output end D and rest-set flip-flop
Hold S.The input terminal X of the height alarm module HLALM receives the mains frequency deviation signal Δ f that network system issues, through height
It is exported after low alarm to the set end S of rest-set flip-flop.
The input terminal X of the quality judgment module TQLT is connect with network system, the reset terminal of output end D and rest-set flip-flop
R connection.The input terminal X of the quality judgment module TQLT receives the mains frequency deviation signal Δ f that network system issues, through product
It is exported after matter judgement to the reset terminal R of rest-set flip-flop；
The output end D of the rest-set flip-flop is connect with the set end S of analog quantity switch；Export high level or low level letter
Number to analog quantity switch set end S.
The second input terminal X2 of the analog quantity switch AXSEL receives speed error signal Δ n；The analog quantity switching
The output end of device is connect with unit, and value to the unit of the value or the second input terminal that export first input end carries out primary frequency modulation compensation
Control.
In the present embodiment, an input terminal X1 of the multiplier MUL is connect with network system, another input terminal X2 and simulation
Measure generator A connection.The input terminal X2 of the multiplier MUL receives the numerical value of analog generator A setting, thermal power generation unit
In the value be 60.
" power quality power system frequency is inclined according to GB/T 15945 for the high-low limits of the height alarm module HLALM
Difference " and each regional power grid as defined in frequency departure limit value be that extreme value is set, GB/T 15945 provides that electric system is normal
Service condition lower frequency deviation limit value is ± 0.2Hz, therefore ceiling value H setting range is generally 0.1 between 0.2Hz, lower limit value L
It is equal with the order of magnitude of ceiling value, positive and negative on the contrary, i.e. L=-H, magnitude is between -0.2 to -0.1Hz.
The high-low limits of the height clipping module HLLMT can be according to " the thermal power generation unit primary frequency modulation of GB/T 30370
Test and performances acceptance directive/guide " in regulation to set, the order of magnitude of high lower bound is equal, positive and negative on the contrary, i.e. L=-H.
As shown in Fig. 2, the utility model proposes the net source primary frequency modulation regulator control system based on power grid reference frequency deviation
The course of work are as follows:
The numerical value that the multiplier is arranged according to analog generator carries out the amplitude of power grid reference frequency deviation signal
New amplitude is obtained after multiplication process, is transmitted to the input terminal of height clipping module；If new amplitude is no more than high low clip mould
The high-low limits being arranged in block, then it is first defeated to analog quantity switch to export the new amplitude for the output end of height clipping module
Enter end.
When the amplitude of mains frequency deviation signal is more than the high-low limits being arranged in height alarm module, the height report
The output end of alert module exports the set end of high level signal to rest-set flip-flop.
If mains frequency deviation signal is normal, the output end of the quality judgment module exports low level signal to RS triggering
The reset terminal of device；The output end of rest-set flip-flop exports the set end of high level signal to analog quantity switch；The analog quantity is cut
The value of first input end is exported to unit and carries out primary frequency modulation compensation control by parallel operation.
If mains frequency deviation signal is abnormal, the output end of the quality judgment module exports high level signal to RS triggering
The reset terminal of device；The output end of rest-set flip-flop exports the set end of low level signal to analog quantity switch；The analog quantity is cut
The value of second input terminal is exported to unit and carries out primary frequency modulation compensation control by parallel operation.
Power grid is operated normally in 50Hz, and when mains frequency is unstable, power grid regulation system can be according to collected benchmark
Frequency calculates with 50Hz phase and generates mains frequency deviation delta f, controls for AGC and primary frequency modulation, to realize the frequency modulation function of power grid
Energy.If | Δ f | it is more than defined big frequency departure numerical value, by analog quantity switch AXSEL, by the frequency deviation of power grid
F, which is sent to unit, carries out unified frequency compensation adjustment, to promote corresponding primary frequency modulation compensation power under the unit frequency departure
It changes rapidly, meets power grid frequency modulation requirement.When unit normal table operation when, due to mains frequency deviation delta f fluctuation compared with
Small, unit carries out relevant primary frequency modulation compensating movement according to itself collected speed error signal.
Specific embodiment 1:
By taking conventional 300MW grades direct-firing drum boiler unit as an example, scheduling controlling department is according to national standards and professional standard
Regulation, the tolerance of frequency is ± 0.2Hz, and is lower than 0.1Hz or the power network fluctuation higher than -0.1Hz, power grid risk it is smaller and
Unit can use its accumulation of heat and guarantee its fm capacity, therefore the high limit H of height alarm module HLALM is 0.1, and lower bound L is -0.1.
Meanwhile according to requirement in GB/T 30370-2013 " test of thermal power generation unit primary frequency modulation and performances acceptance directive/guide ", 300MW
The maximum primary frequency modulation amount of fired power generating unit should be 8% rated power, i.e., maximum primary frequency modulation power variation is 24MW, and is turned
Fast diversity factor is 5%, revolving speed every variation 1 turn of corresponding changed power 2MW, 24 ÷ 2=12, along with defined ± 2 dead zone
Value, then the high limit H of height clipping module HLLMT is set as 14, and lower bound L is set as -14.
When mains frequency is 49.85Hz, i.e., when mains frequency deviation signal is 0.15Hz, since the value is alarmed beyond height
Set high limit limit value 0.1 in module HLALM, then the high limit warning output end D of HLALM is high level " 1 ", i.e. rest-set flip-flop
Set end S is " 1 "；
If the mains frequency deviation delta f signal for being sent to unit at this time is normal, i.e. the output of quality judgment module TQLT is
Low level " 0 ", then the output of rest-set flip-flop is high level " 1 ", and the set end S of analog quantity switch AXSEL is high level " 1 ",
The value of input terminal X1 is exported to unit and carries out primary frequency modulation compensation control by analog quantity switch AXSEL；At this point, mains frequency is inclined
Poor Δ f is 0.15Hz, then the output valve of multiplier MUL is 60 × 0.15=9, height of the value in height clipping module HLLMT
Within limits, so when unit actual speed deviation carry out load control system according to 9, realize the unified frequency control in net source
System；
If being sent to the mains frequency deviation delta f abnormal signal of unit, such as occurrence of equipment failure at this time, then quality judges
The output of module TQLT is high level " 1 ", then the reset terminal R of rest-set flip-flop is high level " 1 ", and output is low level " 0 ", mould
The set end S of analog quantity switch AXSEL is low level " 0 ", and analog quantity switch AXSEL exports the value of input terminal X2 to unit
Primary frequency modulation compensation control is carried out, i.e., is controlled according to the original revolving speed deviation of unit, anti-stop signal inaccuracy causes unit
Dysregulation influences the stable operation of unit.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type protection scope, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (4)
1. a kind of net source primary frequency modulation regulator control system based on power grid reference frequency deviation, characterized in that touched including multiplier, RS
Send out device, height clipping module, height alarm module, analog quantity switch and quality judgment module；
The input terminal of the multiplier receives the mains frequency deviation signal that network system issues, and exports after multiplying supreme
The input terminal of low clip module；It is exported after high low clip to the first input end of analog quantity switch；
The input terminal of the height alarm module receives the mains frequency deviation signal that network system issues, defeated after just alarming
Out to the set end of trigger；
The input terminal of the quality judgment module receives the mains frequency deviation signal that network system issues, defeated after quality judges
Out to the reset terminal of rest-set flip-flop；
Second input terminal of the analog quantity switch receives speed error signal；The set end and RS of analog quantity switch trigger
The output end of device connects；The value of the output end output first input end of the analog quantity switch or the value of the second input terminal are to machine
Group carries out primary frequency modulation compensation control.
2. the net source primary frequency modulation regulator control system according to claim 1 based on power grid reference frequency deviation, characterized in that
One input terminal of the multiplier is connect with network system, and another input terminal is connect with analog generator.
3. the net source primary frequency modulation regulator control system according to claim 1 based on power grid reference frequency deviation, characterized in that
The maximum value for the mains frequency deviation signal that the ceiling value of the height alarm module and lower limit value are issued according to network system and
Minimum value setting.
4. the net source primary frequency modulation regulator control system according to claim 1 based on power grid reference frequency deviation, characterized in that
The ceiling value and lower limit value of the height clipping module are set according to the maximum value and minimum value of fired power generating unit primary frequency modulation amount.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600223A (en) * | 2020-12-03 | 2021-04-02 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation automatic switching control system based on power grid frequency |
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2018
- 2018-07-18 CN CN201821143678.5U patent/CN208401559U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600223A (en) * | 2020-12-03 | 2021-04-02 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation automatic switching control system based on power grid frequency |
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