CN109378853A - Grid-connected unit primary frequency modulation quickly adjusts system and method under DC Line Fault - Google Patents
Grid-connected unit primary frequency modulation quickly adjusts system and method under DC Line Fault Download PDFInfo
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- CN109378853A CN109378853A CN201811539977.5A CN201811539977A CN109378853A CN 109378853 A CN109378853 A CN 109378853A CN 201811539977 A CN201811539977 A CN 201811539977A CN 109378853 A CN109378853 A CN 109378853A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses unit primary frequency modulations grid-connected under a kind of DC Line Fault quickly to adjust system and method, system includes the monitoring modular being connected by transmission channel and frequency modulation control module, monitoring modular is used to carry out changed power monitoring and malfunction monitoring to operation DC line in regional power grid, when both comprehensive descisions are met certain condition simultaneously, direct current emergency FM signal is generated, quantitative emergency frequency deviation value signal is calculated according to the momentary fluctuation value situation of dc power in regional power grid；Frequency modulation control module is used to carry out unit frequency modulation control logic the switching at runtime of exemplary frequency deviation values, to realize that the emergency of frequency adjusts in advance.The present invention targetedly carries out emergency frequency modulation control to grid-connected unit, in unit frequency modulation response time point in advance, effectively solve the problems, such as that grid-connected unit causes response when exchanging power fluctuation asynchronous in DC line fault, it is ensured that the high level of synchronization of grid-connected unit and mains frequency fluctuation.
Description
Technical field
The present invention relates to net source coordination technical field, grid-connected unit primary frequency modulation is fast under specifically a kind of DC Line Fault
The whole system and method for velocity modulation.
Background technique
With China's rapid economic development, electricity needs, power grid scale increasingly increase, but china natural resources distribution and economic hair
It opens up and unbalanced, to improve operation of power networks economy, realizes the optimization distribution of resource, in recent years high pressure interconnected network construction scale
Constantly expand.Since the eighties in last century, D.C. high voltage transmission (High Voltage Direct Current, HVDC) technology
It graduallys mature, HVDC can be realized the interconnection of Asynchronous Communication power grid, and transmission power is big, high-efficient, extensive defeated over long distances
Electric aspect has great advantage.D.C. high voltage transmission realize regional power grid interconnection, increase economic efficiency while, there is also
Systematic risk.Device components are numerous in high-voltage direct current, and primary system, control and protection system, auxiliary system etc. are multiple
Miscellaneous multiplicity, transmission line of electricity is up to thousands of kilometers, passes through that landform is changeable, environment is complicated, in addition multiple-circuit line system and AC system
Between there are reciprocal effects, therefore, the monopole of high-voltage direct current, bipolar locking failure are difficult to avoid that, are occurred often.Previous
Back analysis after grid simulation analysis and accident is shown, Dan Shuan occurs when extensive power conveys once extra-high voltage direct-current
Large-scale fluctuation will occur for pole locking, section power, to give, receiving end power grid forms greater impact.From receiving end power grid accident feelings
From the point of view of condition, it is mainly shown as under extensive power notch that the quick of mains frequency falls, busbar voltage fluctuation influences electricity
The stable operation of net system.
By taking certain ± 800kV extra high voltage direct current transmission line as an example, transmission line of electricity distance reaches 2090 kilometers, bipolar specified
Convey electric current 4500A, 7,200,000 kilowatts of the specified transmission capacity of route.58 divide on September 19,21 2015, and the extra-high voltage direct-current is defeated
Electric line causes direct current that bipolar locking occurs because sending end suffers lightning stroke, loses dc power 4902MW, and larger function occurs in receiving end power grid
Rate vacancy, 13s mains frequency falls to 49.557Hz after failure, and fall is more than 0.4Hz, and frequency retrieval is to normal after about 240s
It is horizontal.According to phases such as GB/T 31464 " operation of power networks criterion ", GB/T 19963 " wind power plant accesses power system technology regulation "
It closes in required standard and specifies frequency modulation performance requirement, either with regard to that need to have response after the set grid-connections such as thermoelectricity, water power, wind-powered electricity generation
The ability of mains frequency variation.The frequency characteristic of power grid depends on the frequency characteristic of load and the frequency characteristic of generator.Work as electricity
After Force system is disturbed by extensive active power, power demand is on the one hand reduced by the frequency mediating effect+6 of load；Separately
On the one hand, change system power output by the spinning reserve capacity of unit grid-connected in calling system.In general, power grid preferentially leads to
Overregulate system power output systems stabilisation frequency stabilization.Meanwhile based on Net Frame of Electric Network, generating set distribution, unit parameter and load
The frequency characteristic of the influence of the factors such as type, network system is rendered as spatial and temporal distributions.When the failures such as direct current locking occur for power grid,
Direct current exchanges power and significant changes occurs, and mains frequency changes, therewith according to distance between unit and DC Line Fault point
Distance, the successive occurrence frequency variation of unit, while Grid control deviation (ACE) value changes, each unit maximum frequency
Deviation is consistent substantially with the frequency difference extreme value at DC Line Fault point.But the time occurred with fault point frequency difference extreme value
Point is different, and unit is there are different time delays, the delay time, and unit to be caused to be based on exemplary frequency deviation values and carry out power response depositing
It is lagging, is causing mains frequency to fall larger.
Summary of the invention
In view of the deficiencies of the prior art, the invention proposes unit primary frequency modulations grid-connected under a kind of DC Line Fault quickly to adjust
System and method, can in DC Line Fault response time of grid-connected unit primary frequency modulation in advance, accelerate the steady of mains frequency
It is fixed to return.
The present invention solves its technical problem and adopts the technical scheme that:
On the one hand, grid-connected unit primary frequency modulation quickly adjusts system under a kind of DC Line Fault provided in an embodiment of the present invention,
Including the monitoring modular being connected by transmission channel and frequency modulation control module, the monitoring modular is arranged in dispatching of power netwoks main website
Side, for DC line progress changed power monitoring and malfunction monitoring is run in regional power grid, both comprehensive descisions to be full simultaneously
When sufficient certain condition, direct current emergency FM signal is generated, is calculated according to the momentary fluctuation value situation of dc power in regional power grid
Emergency frequency deviation value signal is quantified out；The frequency modulation control module setting is in power supply unit substation side, for unit frequency modulation
Control logic carries out the switching at runtime of exemplary frequency deviation values, to realize that the emergency of frequency adjusts in advance.
As a kind of possible implementation of the present embodiment, the monitoring modular includes subtracter block DEV, hysteresis block
LAG, function module F (x), to value modules A BS, comparator module CMP, the first logical AND modules A ND1, logic or module OR and
Energy Management System EMS；The first input end of the subtracter block DEV and the input terminal of hysteresis block LAG are respectively connected to electricity
Net direct current general power, the output of hysteresis block LAG are connected to the second input terminal of subtracter block DEV, subtracter block DEV's
Output is sent all the way to function module F (x) and calculates emergency frequency deviation, is sent after absolute value block ABS all the way to comparator mould
The first input end of block CMP；The output of comparator module CMP is connected to the first input end of the first logical AND modules A ND1；Institute
The input terminal for stating logic or module OR is respectively connected to all in net DC line fault signal, and the output of logic or module OR terminate
To the second input terminal of the first logical AND modules A ND1, direct current emergency FM signal is sent to energy by the second logical AND modules A ND1
Management system EMS is measured, emergency frequency deviation value signal is sent to Energy Management System EMS, the transmission by function module F (x)
Comprehensive descision processing is carried out to direct current emergency FM signal and emergency frequency deviation value signal to Energy Management System EMS, and will
Emergency frequency modulation control instruction is sent to frequency modulation control module.
As a kind of possible implementation of the present embodiment, the frequency modulation control module includes remote measurement and control terminal RTU, height
Lower bound alarm module HLALM, quality judgment module QC, the second logical AND modules A ND2, pulse timer module Timer and simulation
Measure selector AXSEL；The remote measurement and control terminal receives the direct current emergency that Energy Management System EMS is sent by transmission channel and adjusts
Emergency frequency deviation value signal is sent all the way to analog quantity and is selected by frequency signal and emergency frequency deviation value signal, remote measurement and control terminal
The first input end of device AXSEL send the input terminal of supreme lower bound alarm module HLALM all the way, judges mould through signal quality all the way
It is sent after block QC to the second input terminal of logical AND modules A ND2；Boolean complementation mould is passed through in the output of high lower bound alarm module HLALM
The first input end of the second logical AND modules A ND2 is accessed after block NOT；Remote measurement and control terminal sends direct current emergency FM signal
To the third input terminal of the second logical AND modules A ND2；The output end of second logical AND modules A ND2 accesses pulse timer module
The set end of Timer, the set end of the output end access analog quantity selector AXSEL of pulse timer module Timer, analog quantity
Selector AXSEL output emergency fast frequency hopping instruction.
As a kind of possible implementation of the present embodiment, end and first is arranged in the lag time of the hysteresis block LAG
The numberical range of the A1 connection of analog quantity number register, the first analog quantity number register A1 is set as 80-120 milliseconds；The comparison
The second input terminal of device module CM P is connect with the second analog quantity number register A2, the numerical value model of the second analog quantity number register A2
It encloses and is set as 1000-2000.
As a kind of possible implementation of the present embodiment, the time end and third of the pulse timer module Timer
The numberical range of the A3 connection of analog quantity number register, the third analog quantity number register A3 is set as 4-10 seconds.
As a kind of possible implementation of the present embodiment, the high-low limits of the high lower bound alarm module HLALM according to
Grid-connected machine set type is set, the ceiling value of grid-connected machine set type high lower bound alarm module HLALM when being Wind turbines is+0.2,
Lower limit value is -0.5；The ceiling value of grid-connected machine set type high lower bound alarm module HLALM when being fired power generating unit is+0.5, lower limit value
It is -1.5.
As a kind of possible implementation of the present embodiment, analog quantity selector AXSEL second inputs the former frequency of endmatcher group
Rate deviation.
As a kind of possible implementation of the present embodiment, the setting of power supply unit substation side is multiple to pass through transmission respectively
The frequency modulation control module that channel is connected with dispatching of power netwoks main website side monitoring modular.
On the other hand, the quick side of adjustment of grid-connected unit primary frequency modulation under a kind of DC Line Fault provided in an embodiment of the present invention
Method, comprising:
Dispatching of power netwoks main website side carries out changed power monitoring and malfunction monitoring to DC line is run in regional power grid, comprehensive
Both judgements are simultaneously when meeting certain condition, and generate direct current and meet an urgent need FM signal, according in regional power grid dc power it is instantaneous
Undulating value situation calculates quantitative emergency frequency deviation；
Direct current emergency FM signal and emergency frequency deviation value signal are transmitted by transmission channel dispatching of power netwoks main website side
To power supply unit substation side；
Power supply unit substation side carries out unit frequency modulation control logic under the premise of ensuring that signal quality and amplitude are effective
The switching at runtime of exemplary frequency deviation values realizes that the emergency of frequency adjusts in advance.
As a kind of possible implementation of the present embodiment, the grid-connected quick-adjustsing tool of unit primary frequency modulation under DC Line Fault
Body process are as follows:
Whether DC line breaks down in dispatching of power netwoks main website side monitoring regional power grid, then sentences in case of DC Line Fault
Whether the momentary fluctuation value of dc power is out-of-limit in disconnected regional power grid at this time, if it exceeds limit value, then dispatching of power netwoks main website is lateral
Power supply unit substation side issues direct current emergency FM telecontrol signal and emergency frequency deviation remote regulating signal；Power supply unit substation side
Effective judgement is carried out to the remote signal and remote regulating signal come through transmission channel transmission, unit is according to emergency frequency if effectively
Rate deviation carries out emergency frequency modulation.
What the technical solution of the embodiment of the present invention can have has the beneficial effect that:
On the one hand, grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault of technical solution of the embodiment of the present invention
System, including the monitoring modular being connected by transmission channel and frequency modulation control module, the monitoring modular is arranged in dispatching of power netwoks master
It stands side, for carrying out changed power monitoring and malfunction monitoring to running DC line in regional power grid, both comprehensive descisions are simultaneously
When meeting certain condition, direct current emergency FM signal is generated, according to the momentary fluctuation value situation meter of dc power in regional power grid
Calculate quantitative emergency frequency deviation value signal；The frequency modulation control module setting is in power supply unit substation side, for unit tune
Frequency control logic carries out the switching at runtime of exemplary frequency deviation values, to realize that the emergency of frequency adjusts in advance.The present invention can be to region
DC line fault and DC communication power are monitored analysis in power grid, targetedly carry out emergency frequency modulation to grid-connected unit
Control, in unit frequency modulation response time point in advance, effectively solving grid-connected unit causes to exchange power substantially in DC line fault
The asynchronous problem of response when fluctuation, it is ensured that the high level of synchronization of grid-connected unit and mains frequency fluctuation.
On the other hand, grid-connected unit primary frequency modulation quickly adjusts under a kind of DC Line Fault of technical solution of the embodiment of the present invention
Method, comprising: dispatching of power netwoks main website side carries out changed power monitoring and malfunction monitoring to DC line is run in regional power grid, comprehensive
When both conjunction judgements are met certain condition simultaneously, direct current emergency FM signal is generated, according to the wink of dc power in regional power grid
When undulating value situation calculate quantitative emergency frequency deviation；Direct current is met an urgent need frequency modulation by transmission channel dispatching of power netwoks main website side
Signal and emergency frequency deviation value signal are sent to power supply unit substation side；Power supply unit substation side is ensuring signal quality and width
The switching at runtime for carrying out exemplary frequency deviation values under the premise of value is effective to unit frequency modulation control logic, realizes that the emergency of frequency is adjusted in advance
It is whole.The present invention can be monitored analysis to DC line fault in regional power grid and DC communication power, targetedly right
Grid-connected unit carries out emergency frequency modulation control, under the premise of confirmation signal effectively ensures to hold the safe operation of unit, is advanced by machine
Group frequency modulation response time point, reduces the frequency fluctuation of network system.The present invention efficiently solves grid-connected unit in DC line
Failure leads to the asynchronous problem of response when exchanging power fluctuation, it is ensured that the height of grid-connected unit and mains frequency fluctuation
Synchronism.
Detailed description of the invention
Fig. 1 is that grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault shown according to an exemplary embodiment
The block diagram of system；
Fig. 2 is that grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault shown according to an exemplary embodiment
The schematic diagram of system；
Fig. 3 is the quick side of adjustment of grid-connected unit primary frequency modulation under a kind of DC Line Fault shown according to an exemplary embodiment
The flow chart of method；
Fig. 4 is pulse timer operation principle schematic diagram；
Fig. 5 is input value X and a kind of corresponding curve graph of output valve Y in function module F (x).
In figure, DEV is subtracter block, LAG is hysteresis block, F (x) is function module, ABS is absolute value block, CMP
For comparator module, AND1 be the first logical AND module, OR is logic or module, EMS be Energy Management System, RTU1,
RTU2 ... RTUn is the first remote measurement and control terminal, n-th of remote measurement and control terminal of the second remote measurement and control terminal ..., HLALM are height
Limit alarm module, NOT is Boolean complementation module, QC is quality judgment module, AND2 is the second logical AND module, Timer is arteries and veins
Rush timer module, AXSEL is analog quantity selector, A1 be the first analog quantity number register A1, A2 be the second analog quantity number register,
A3 is third analog quantity number register.
Specific embodiment
In order to clarify the technical characteristics of the invention, below by specific embodiment, and its attached drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used to realize different knots of the invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
Fig. 1 is that grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault shown according to an exemplary embodiment
The block diagram of system.As shown in Figure 1, grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault provided in an embodiment of the present invention
System, including the monitoring modular being connected by transmission channel and frequency modulation control module, the monitoring modular is arranged in dispatching of power netwoks master
It stands side, for carrying out changed power monitoring and malfunction monitoring to running DC line in regional power grid, both comprehensive descisions are simultaneously
When meeting certain condition, direct current emergency FM signal is generated, according to the momentary fluctuation value situation meter of dc power in regional power grid
Calculate quantitative emergency frequency deviation value signal；The frequency modulation control module setting is in power supply unit substation side, for unit tune
Frequency control logic carries out the switching at runtime of exemplary frequency deviation values, to realize that the emergency of frequency adjusts in advance.
Fig. 2 is that grid-connected unit primary frequency modulation quickly adjusts and is under a kind of DC Line Fault shown according to an exemplary embodiment
The schematic diagram of system.
In one possible implementation, the monitoring modular includes subtracter block DEV, hysteresis block LAG, function
Module F (x), to value modules A BS, comparator module CMP, the first logical AND modules A ND1, logic or module OR and energy management
System EMS；It is total that the first input end of the subtracter block DEV and the input terminal of hysteresis block LAG are respectively connected to power grid direct current
Power, the output of hysteresis block LAG are connected to the second input terminal of subtracter block DEV, and the output of subtracter block DEV is all the way
It send to function module F (x) and calculates emergency frequency deviation, sent after absolute value block ABS all the way to the of comparator module CMP
One input terminal；The output of comparator module CMP is connected to the first input end of the first logical AND modules A ND1；The logic or mould
The input terminal of block OR is respectively connected to all in net DC line fault signal, and the output of logic or module OR are connected to the first logic
With the second input terminal of modules A ND1, direct current emergency FM signal is sent to Energy Management System by the second logical AND modules A ND1
Emergency frequency deviation value signal is sent to Energy Management System EMS by EMS, function module F (x), described to be sent to energy management
System EMS carries out comprehensive descision processing to direct current emergency FM signal and emergency frequency deviation value signal, and the frequency modulation control that will meet an urgent need
System instruction is sent to frequency modulation control module.
In one possible implementation, the frequency modulation control module includes remote measurement and control terminal RTU, the alarm of high lower bound
Module HLALM, quality judgment module QC, the second logical AND modules A ND2, pulse timer module Timer and analog quantity selector
AXSEL；The remote measurement and control terminal by transmission channel receive Energy Management System EMS send direct current meet an urgent need FM signal and
Emergency frequency deviation value signal, remote measurement and control terminal send emergency frequency deviation value signal all the way to analog quantity selector AXSEL
First input end, send the input terminal of supreme lower bound alarm module HLALM all the way, sent after signal quality judgment module QC all the way
To the second input terminal of logical AND modules A ND2；The output of high lower bound alarm module HLALM is followed by by Boolean complementation module NOT
Enter the first input end of the second logical AND modules A ND2；Direct current emergency FM signal is sent to the second logic by remote measurement and control terminal
With the third input terminal of modules A ND2；The output end access pulse timer module Timer's of second logical AND modules A ND2 sets
Position end, the set end of the output end access analog quantity selector AXSEL of pulse timer module Timer, analog quantity selector
AXSEL output emergency fast frequency hopping instruction.
As a kind of possible implementation of the present embodiment, end and first is arranged in the lag time of the hysteresis block LAG
The numberical range of the A1 connection of analog quantity number register, the first analog quantity number register A1 is set as 80-120 milliseconds；The comparison
The second input terminal of device module CM P is connect with the second analog quantity number register A2, the numerical value model of the second analog quantity number register A2
It encloses associated with A1, is set as 1000-2000.
In one possible implementation, the time end of the pulse timer module Timer is set with third analog quantity
Number device A3 connections, the numberical range of the third analog quantity number register A3 and grid-connected unit apart from direct current output, pick-up point it is remote
It is close related, it is set as 4-10 seconds.
In one possible implementation, the high-low limits of the high lower bound alarm module HLALM is according to grid-connected unit
Type is set, and grid-connected machine set type is provided the height that high lower bound alarm module HLALM is arranged by GB/T19663 when being Wind turbines
Limit value is that+0.2, lower limit value is -0.5；High lower bound report is set by the regulation of GB/T 31464 when grid-connected machine set type is fired power generating unit
It is -1.5 that the ceiling value of alert module HLALM, which is+0.5, lower limit value,.
In one possible implementation, analog quantity selector AXSEL second inputs endmatcher group primary frequency deviation.
In one possible implementation, the setting of power supply unit substation side is multiple passes through transmission channel and electricity respectively
The connected frequency modulation control module of net scheduling station side monitoring modular.
Direct current is latched lower unit primary frequency modulation and quickly adjusts system, including grid side, transmission channel and source side.
Wherein, transmission channel relies on the original net source optical fiber special line channel of system；
Wherein, grid side: by dc power in regional power grid send respectively to subtracter block DEV first input end X1 and
The output end Y of the input terminal X of hysteresis block LAG, hysteresis block LAG are connected to the second input terminal X2 of subtracter block DEV, acquire
Dc power side variable quantity at the appointed time；It send to the input terminal of function module F (x) on mono- tunnel output Y of subtracter block DEV
Emergency frequency deviation is calculated, is sent after absolute value block ABS all the way to the first input end X1 of comparator module CMP；Compare
The output end D of device module CM P is connected to the first input end X1 of logical AND modules A ND；By all in net DC line fault signal
Send the input terminal to logic or module OR, the output end D of logic or module OR are connected to the second input terminal of logical AND modules A ND1
X2, logical AND modules A ND1 judge whether to need to carry out " direct current emergency frequency modulation "；" direct current emergency frequency modulation " signal and function module F
(x) " emergency frequency deviation " signal exported passes through Energy Management System EMS progress comprehensive descision processing, is sent respectively to not
Emergency frequency modulation control is carried out with grid-connected unit.
Wherein, source side: RTU is connect by remote measurement and control terminal and receives the remote signal that grid side is sent by transmission channel
" direct current emergency frequency modulation " and remote regulating signal " emergency frequency deviation ", remote regulating signal " emergency frequency deviation " are sent all the way to simulation
The first input end X1 for measuring selector AXSEL, send the input terminal X of supreme lower bound alarm module HLALM, all the way through signal product all the way
It is sent after matter judgment module QC to the second input terminal Z2 of logical AND modules A ND2；The output of high lower bound alarm module HLALM is passed through
The first input end Z1 of logical AND modules A ND2, remote signal " direct current emergency frequency modulation " access are accessed after Boolean complementation module NOT
The third input terminal Z3 of logical AND modules A ND2；The output end D access pulse timer module Timer's of logical AND modules A ND2
The set end S of the output end D access analog quantity selector AXSEL of set end Set, pulse timer module Timer, decide whether
Carry out " emergency fast frequency hopping ".
The present embodiment can be monitored analysis to DC line fault in regional power grid and DC communication power, be directed to
Property carries out emergency frequency modulation control to grid-connected unit, in unit frequency modulation response time point in advance, effectively solves grid-connected unit straight
Flow Line failure leads to the asynchronous problem of response when exchanging power fluctuation, it is ensured that grid-connected unit and mains frequency fluctuation
High level of synchronization.
On the other hand, the quick side of adjustment of grid-connected unit primary frequency modulation under a kind of DC Line Fault provided in an embodiment of the present invention
Method, comprising:
Dispatching of power netwoks main website side carries out changed power monitoring and malfunction monitoring to DC line is run in regional power grid, comprehensive
Both judgements are simultaneously when meeting certain condition, and generate direct current and meet an urgent need FM signal, according in regional power grid dc power it is instantaneous
Undulating value situation calculates quantitative emergency frequency deviation；
Direct current emergency FM signal and emergency frequency deviation value signal are transmitted by transmission channel dispatching of power netwoks main website side
To power supply unit substation side；
Power supply unit substation side carries out unit frequency modulation control logic under the premise of ensuring that signal quality and amplitude are effective
The switching at runtime of exemplary frequency deviation values realizes that the emergency of frequency adjusts in advance.
Fig. 3 is the quick side of adjustment of grid-connected unit primary frequency modulation under a kind of DC Line Fault shown according to an exemplary embodiment
The flow chart of method.As shown in Figure 3.In one possible implementation, the grid-connected fast velocity modulation of unit primary frequency modulation under DC Line Fault
Whole detailed process are as follows:
(1) dispatching of power netwoks main website side is in the DC line of net operation using in the power grid of D5000 system monitoring region
It is no to break down；
(2) judge whether the momentary fluctuation value of dc power in regional power grid at this time exceeds if DC Line Fault occurs to be advised
Fixed limit value；
(3) if momentary fluctuation value be more than limit value, dispatching of power netwoks main website side issue " direct current emergency frequency modulation " remote signal and
" emergency frequency deviation " remote regulating signal；
(4) power supply unit substation side carries out Effective judgement to the remote signal and remote regulating signal come through network transmission, such as
Effective then unit carries out emergency frequency modulation according to emergency frequency deviation.
The present embodiment can be monitored analysis to DC line fault in regional power grid and DC communication power, be directed to
Property carries out emergency frequency modulation control to grid-connected unit, not only effectively ensures to hold the premise of the safe operation of unit in confirmation signal
Under, it is advanced by unit frequency modulation response time point, reduces the frequency fluctuation of network system, and efficiently solves grid-connected unit and exists
DC line fault leads to the asynchronous problem of response when exchanging power fluctuation, it is ensured that grid-connected unit and mains frequency wave
Dynamic high level of synchronization.
Function module F (x) is dead-time voltage function, and dc power momentary fluctuation value is smaller to be fluctuated in controlled range
When, output is 0；Dc power momentary fluctuation value is larger, and when reaching upper lower limit value, output keeps a constant frequency departure up and down
Value；Intermediate section is linear scale output.
Pulse timer working principle is as shown in Figure 4: not occurring when Set signal changes to 1 and reset signal Rst from 0, D is defeated
Keeping width out is the pulse signal of DT；If the rising edge of Rst signal arrives during timing, D output resets immediately, until next
The rising edge of a Set signal.The end pulse timer Rst is connectionless in the present invention, as " 0 ", therefore, as long as Set end signal is from 0
1 is changed to, then it is the pulse signal of DT that D output, which keeps width,.
By taking the Shandong Power of North China region as an example, there are silver-colored eastern direct current, Shandong to consolidate three direct current, clear Yihe River direct current AC lines inside the province
Road, dc power total amount are typically about 7000MW.Analog generator A1 is set as 100；Due to province's network re-active power wave
It moves within 1500MW, frequency is without significant change, therefore the numerical value of analog generator A2 is set as 1500；Source side selected distance
It is analyzed for certain closer thermal power generation unit of pick-up point, the numerical value of analog generator A3 is set as 4；High lower bound alarm
The high-low limits setting lower bound of module HLALM is that -1.5, height is limited to+0.5.
The locking of certain moment silver east direct current pole II, issues DC line fault signal, as receiving end power grid, by 80 milliseconds,
Sending dc power outside becomes 0MW from 1935MW.
Grid side: power grid dc power send after 100 milliseconds of lag are handled to subtracter block by hysteresis block LAG
DEV is calculated, then the output of subtracter block DEV is -1935；1935 after absolute value block ABS send to comparator mould
The first input end X1 of block CMP, the value of the second input terminal X2 of comparator module CMP is 1500 at this time, because 1935 > 1500,
Therefore the output of comparator module CMP is high level " 1 ", i.e. the first input end X1 of logical AND modules A ND is high level " 1 "；It patrols
It collects or the input terminal of module OR receives " DC line fault signal ", output is high level " 1 ", i.e. logical AND modules A ND1's
Second input terminal X2 is high level " 1 "；Since two input terminals of logical AND modules A ND1 are high level " 1 ", therefore logical AND
The output of modules A ND1 is high level " 1 ", i.e. sending " direct current emergency frequency modulation " signal.
Input value X and output valve Y respective function in function module F (x) is as shown in the table:
| Dc power momentary fluctuation value | Emergency frequency deviation |
| -7000 | -0.2 |
| -3000 | -0.2 |
| -1500 | 0 |
| 1500 | 0 |
| 3000 | 0.2 |
| 7000 | 0.2 |
Corresponding curve is as shown in figure 5, function expression in function module F (x) are as follows:
For receiving end power grid, since other provinces dc power variation received is -1935MW, necessarily lead to the power saving
Net frequency is lower than 50Hz, and the output valve in function module F (x) is -0.058Hz at this time, i.e., mains frequency is estimated as at this time
49.942Hz needs unit to carry out the compensation adjustment of power rise.
" direct current emergency frequency modulation " signal and " emergency frequency deviation " signal of function module F (x) output pass through energy
Management system EMS carries out comprehensive descision processing, is sent respectively to different grid-connected units and carries out emergency frequency modulation control.
Source side: RTU is connect by remote measurement and control terminal and receives the remote signal " direct current that grid side is sent by transmission channel
Emergency frequency modulation " is high level " 1 " and remote regulating signal " emergency frequency deviation " is -0.058；Remote regulating signal " emergency frequency deviation
Value " send the input terminal X of supreme lower bound alarm module HLALM, since lower bound is arranged in the high-low limits of high lower bound alarm module HLALM
+ 0.5 is limited to for -1.5, height, and -1.5 < -0.058 < 0.5, therefore the output of high lower bound alarm module HLALM is low level " 0 ", warp
It crosses for high level " 1 " after Boolean complementation module NOT, i.e. the first input end Z1 of logical AND modules A ND2 is high level " 1 "；If
Remote regulating signal " emergency frequency deviation " judges that signal quality is out of question through quality judgment module QC at this time, then quality judgment module
The output of QC is high level " 1 ", i.e. the second input terminal Z2 of logical AND modules A ND2 is high level " 1 "；Meanwhile remote signal
" direct current emergency frequency modulation " accesses the third input terminal Z3 of logical AND modules A ND2, is also high level " 1 ", therefore logical AND modules A ND2
Output be high level " 1 ", i.e. the set end Set of pulse timer module Timer be high level " 1 ", pulse timer module
The output of Timer is the high level " 1 " for continuing DT=4 seconds；Then the set end S of analog quantity selector AXSEL is set to high level
" 1 " 4 seconds, selection export the value of first input end X1, i.e., unit enters " emergency fast frequency hopping mould " at this time, and presses frequency departure
Value -0.058 carries out frequency modulation.After 4 seconds, unit itself also incudes and calculates mains frequency fluctuation value, at this time pulse timer mould
The output of block Timer becomes low level " 0 ", and analog quantity selector AXSEL exports the value of the second input terminal X2, i.e., unit is pressed certainly
The exemplary frequency deviation values of body measurement carry out frequency modulation control.
The present invention can be monitored analysis to DC line fault in regional power grid and DC communication power, targetedly
Emergency frequency modulation control is carried out to grid-connected unit, under the premise of confirmation signal effectively ensures to hold the safe operation of unit, in advance
Unit frequency modulation response time point, reduces the frequency fluctuation of network system.
The speed of grid-connected unit active power response directly affects the fluctuation range of mains frequency, effectively solves through the invention
Determined grid-connected unit DC line fault cause exchange power fluctuation when the asynchronous problem of response, it is ensured that grid-connected machine
The high level of synchronization of group and mains frequency fluctuation.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, several improvements and modifications can also be made, these improvements and modifications are also regarded as this hair
Bright protection scope.
Claims (10)
1. grid-connected unit primary frequency modulation quickly adjusts system under a kind of DC Line Fault, which is characterized in that including passing through transmission channel
Connected monitoring modular and frequency modulation control module, the monitoring modular setting is in dispatching of power netwoks main website side, for regional power grid
Interior operation DC line carries out changed power monitoring and malfunction monitoring, when both comprehensive descisions are met certain condition simultaneously, generates
Direct current emergency FM signal, calculates quantitative emergency frequency deviation according to the momentary fluctuation value situation of dc power in regional power grid
Value signal；The frequency modulation control module setting is in power supply unit substation side, for inclined to unit frequency modulation control logic progress frequency
The switching at runtime of difference, to realize that the emergency of frequency adjusts in advance.
2. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as described in claim 1, which is characterized in that described
Monitoring modular include subtracter block DEV, hysteresis block LAG, function module F (x), to value modules A BS, comparator module CMP,
First logical AND modules A ND1, logic or module OR and Energy Management System EMS；The first input of the subtracter block DEV
The input terminal of end and hysteresis block LAG are respectively connected to power grid direct current general power, and the output of hysteresis block LAG is connected to subtracter mould
The second input terminal of block DEV, the output of subtracter block DEV are sent all the way to function module F (x) and calculate emergency frequency deviation,
It is sent after absolute value block ABS all the way to the first input end of comparator module CMP；The output of comparator module CMP is connected to
The first input end of first logical AND modules A ND1；The input terminal of the logic or module OR are respectively connected to all in net AC line
The output of road fault-signal, logic or module OR are connected to the second input terminal of the first logical AND modules A ND1, the second logical AND
Direct current emergency FM signal is sent to Energy Management System EMS by modules A ND1, and function module F (x) is by emergency frequency deviation
Signal is sent to Energy Management System EMS, and the Energy Management System EMS that is sent to is to direct current emergency FM signal and emergency frequency
Rate deviation value signal carries out comprehensive descision processing, and emergency frequency modulation control instruction is sent to frequency modulation control module.
3. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as described in claim 1, which is characterized in that described
Frequency modulation control module includes remote measurement and control terminal RTU, high lower bound alarm module HLALM, quality judgment module QC, the second logical AND
Modules A ND2, pulse timer module Timer and analog quantity selector AXSEL；The remote measurement and control terminal passes through transmission channel
The direct current emergency FM signal and emergency frequency deviation value signal that Energy Management System EMS is sent are received, remote measurement and control terminal will
Emergency frequency deviation value signal is sent all the way to the first input end of analog quantity selector AXSEL, send supreme lower bound alarm mould all the way
The input terminal of block HLALM is sent after signal quality judgment module QC all the way to the second input terminal of logical AND modules A ND2；Just
The output of limit alarm module HLALM accesses the first input end of the second logical AND modules A ND2 after Boolean complementation module NOT；
Direct current emergency FM signal is sent to the third input terminal of the second logical AND modules A ND2 by remote measurement and control terminal；Second logical AND
The set end of the output end access pulse timer module Timer of modules A ND2, the output termination of pulse timer module Timer
Enter the set end of analog quantity selector AXSEL, analog quantity selector AXSEL output emergency fast frequency hopping instruction.
4. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as claimed in claim 2, which is characterized in that described
The lag time setting end of hysteresis block LAG is connect with the first analog quantity number register A1, the first analog quantity number register A1's
Numberical range is set as 80-120 milliseconds；The second input terminal of the comparator module CMP and the second analog quantity number register A2 connect
It connects, the numberical range of the second analog quantity number register A2 is set as 1000-2000.
5. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as claimed in claim 3, which is characterized in that described
The time end of pulse timer module Timer is connect with third analog quantity number register A3, the third analog quantity number register A3's
Numberical range is set as 4-10 seconds.
6. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as claimed in claim 3, which is characterized in that described
The high-low limits of high lower bound alarm module HLALM is set according to grid-connected machine set type, when grid-connected machine set type is Wind turbines
It is -0.5 that the ceiling value of high lower bound alarm module HLALM, which is+0.2, lower limit value,；Grid-connected machine set type high lower bound when being fired power generating unit
The ceiling value of alarm module HLALM is that+0.5, lower limit value is -1.5.
7. grid-connected unit primary frequency modulation quickly adjusts system under DC Line Fault as claimed in claim 3, which is characterized in that simulation
It measures selector AXSEL second and inputs endmatcher group primary frequency deviation.
8. grid-connected unit primary frequency modulation quickly adjusts system under the DC Line Fault as described in claim 1-7 any one, special
Sign is, the setting of power supply unit substation side is multiple to be connected by transmission channel with dispatching of power netwoks main website side monitoring modular respectively
Frequency modulation control module.
9. grid-connected unit primary frequency modulation fast adjustment method under a kind of DC Line Fault characterized by comprising
Dispatching of power netwoks main website side carries out changed power monitoring and malfunction monitoring, comprehensive descision to operation DC line in regional power grid
When the two is met certain condition simultaneously, direct current emergency FM signal is generated, according to the momentary fluctuation of dc power in regional power grid
Value situation calculates quantitative emergency frequency deviation；
Direct current emergency FM signal and emergency frequency deviation value signal are sent to electricity by transmission channel by dispatching of power netwoks main website side
Source unit substation side；
Power supply unit substation side carries out frequency to unit frequency modulation control logic under the premise of ensuring that signal quality and amplitude are effective
The switching at runtime of deviation realizes that the emergency of frequency adjusts in advance.
10. grid-connected unit primary frequency modulation fast adjustment method under DC Line Fault as claimed in claim 9, which is characterized in that straight
Flow the grid-connected quick-adjustsing detailed process of unit primary frequency modulation under failure are as follows:
Whether DC line breaks down in dispatching of power netwoks main website side monitoring regional power grid, then judges this in case of DC Line Fault
Whether the momentary fluctuation value of dc power is out-of-limit in time domain power grid, if it exceeds limit value, then the lateral power supply of dispatching of power netwoks main website
Unit substation side issues direct current emergency FM telecontrol signal and emergency frequency deviation remote regulating signal；Power supply unit substation side is to warp
The remote signal and remote regulating signal that transmission channel transmission comes carry out Effective judgement, and unit is inclined according to emergency frequency if effectively
Difference carries out emergency frequency modulation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551777A (en) * | 2020-05-15 | 2020-08-18 | 浪潮电子信息产业股份有限公司 | Double-path pulse signal comparison detection circuit |
| CN111638400A (en) * | 2020-06-05 | 2020-09-08 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation monitoring system and method based on RTU (remote terminal Unit) standby check |
| CN112952860A (en) * | 2021-03-12 | 2021-06-11 | 神华神东电力有限责任公司 | Generator frequency modulation control method and device |
| CN113078662A (en) * | 2021-05-19 | 2021-07-06 | 广东电网有限责任公司 | New energy rapid frequency response system and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054770A (en) * | 2017-12-31 | 2018-05-18 | 北京金风科创风电设备有限公司 | Photovoltaic power plant and primary frequency modulation control method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054770A (en) * | 2017-12-31 | 2018-05-18 | 北京金风科创风电设备有限公司 | Photovoltaic power plant and primary frequency modulation control method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111551777A (en) * | 2020-05-15 | 2020-08-18 | 浪潮电子信息产业股份有限公司 | Double-path pulse signal comparison detection circuit |
| CN111551777B (en) * | 2020-05-15 | 2022-07-08 | 浪潮电子信息产业股份有限公司 | Double-circuit pulse signal comparison detection circuit |
| CN111638400A (en) * | 2020-06-05 | 2020-09-08 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation monitoring system and method based on RTU (remote terminal Unit) standby check |
| CN111638400B (en) * | 2020-06-05 | 2022-07-08 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation monitoring system and method based on RTU (remote terminal Unit) standby check |
| CN112952860A (en) * | 2021-03-12 | 2021-06-11 | 神华神东电力有限责任公司 | Generator frequency modulation control method and device |
| CN112952860B (en) * | 2021-03-12 | 2024-08-23 | 神华神东电力有限责任公司 | Generator frequency modulation control method and device |
| CN113078662A (en) * | 2021-05-19 | 2021-07-06 | 广东电网有限责任公司 | New energy rapid frequency response system and method |
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