CN106026099A - Data analysis-based real-time monitoring system and method for primary frequency modulation capability of power grid - Google Patents
Data analysis-based real-time monitoring system and method for primary frequency modulation capability of power grid Download PDFInfo
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- CN106026099A CN106026099A CN201610344043.0A CN201610344043A CN106026099A CN 106026099 A CN106026099 A CN 106026099A CN 201610344043 A CN201610344043 A CN 201610344043A CN 106026099 A CN106026099 A CN 106026099A
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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
- H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
The invention discloses a data analysis-based real-time monitoring system and method for the primary frequency modulation capability of a power grid. The method comprises the steps as follows: a signal collector module transmits collected real-time load values of units to first function setting modules, comparator modules and second function setting modules; output of each first function setting module is connected to a first input end of a first selector module; the output of each second function setting module is connected to the first input end of a second selector module; the output of each comparator module is connected to set terminals of the corresponding first selector module and second selector module separately; real-time primary frequency modulation upper limit values output by the first selector modules of all grid-connected frequency modulation units are summated; and real-time primary frequency modulation lower limit values output by the second selector modules of all grid-connected frequency modulation units are summated. Summary and analysis of the primary frequency modulation capability of each unit in various load intervals are achieved through a disturbance test; the primary frequency modulation conditions of the grid-connected frequency modulation units can be effectively monitored; and effective supervision and management are achieved.
Description
Technical field
The present invention relates to fired power generating unit frequency modulation field, be specifically related to primary frequency regulation of power network ability based on data analysis and monitor system in real time
System and method.
Background technology
Power system frequency is a very important parameter of whole system safe operation, is the monitoring quality of power supply and security situation
An important indicator, no matter system frequency is too high or too low all can bring the generating set of whole system, equipment etc. seriously
Harm.Generating set participates in the frequency Primary regulation of power system and is belonging to assistant service, directly influences system frequency
Quality, the stable operation to system plays an important role.When producing imbalance power in system, the frequency of system will occur
Change, the normal range that frequency is allowed beyond system, then the governing system of all online generating set in system will be certainly
The output electromagnetic power of dynamic regulator generator group, makes frequency departure be limited in the normal range that system allows, thus reaches system
New poised state.Primary frequency modulation is that the output of automatic regulator generator group enters system frequency occurs fluctuation when
Line frequency regulates, and quick regulating frequency returns to the normal range that system allows, be the frequency of short time fluctuate widely effective
With one of reliable adjustment means.
Generating set primary frequency regulation function is the function that Turbo-generator Set is intrinsic, mainly by boiler heat storage, occurs at electrical network
In the case of exception, the requirement of quick responsive electricity grid, electric power grid frequency stabilization, to make up network load gap, maintain the peace of electrical network
Entirely.The response that system frequency is changed by Primary regulation is fast, according to the statistics of IEEE, during the comprehensive Primary regulation characteristic of power system
Between constant typically at about 10 seconds, owing to the chemical energy in combustion system does not change, along with the minimizing of amount of stored heat, send out
The power of motor can return to again original level.The size of Primary frequency control ability and the governing system of generating set and generating set
Control mode have very important relation.At present, the digital electro-hydraulic control system (DEH) of fired power generating unit has obtained universal
Use, so that the primary frequency function of generating set is no longer the control characteristic that governing system is intrinsic, and people can be passed through
For carrying out logic change and the operation of switching.Along with the reform that deepens continuously of electricity market, after factory's net separates, generating set
Examination and the difficulty of management increasingly come.The power plant of part is only focused on the stability of generating set and is run, and is unwilling to participate in
In primary frequency modulation, worry that opening primary frequency function can cause the frequent fluctuation of governing system and therrmodynamic system, therefore owing to sending out
Power plant excises unit for a long time and participates in the function of frequency Primary regulation, thus result in the Primary frequency control ability of whole power system
All the time it is in an extremely low level, and the incorrect operation of low frequency load shedding equipment can be caused, the safety of harm power system
Stable operation, the frequency after the system of even resulting in suffers disturbance is collapsed rapidly.Accurate and real-time assessment generators in power systems
The Primary frequency control ability of group, could preferably increase the safe and stable operation quality of whole system.
At present, owing to cannot realize effectively predicting and monitoring to the Primary frequency control ability of grid-connected unit, therefore, occur when electrical network
Significantly load fluctuation, causes wholesale power loss as sent direct current locking etc. outside, and dispatching of power netwoks department can only be according to power notch
Cutting away rapidly corresponding line load, the method easily causes important load power-off, large area resident have a power failure grade make trouble therefore, lead
Cause bigger social influence, not only unfavorable to normal production run, it is unfavorable for the safety and stability of electrical network simultaneously.Meanwhile, along with
The development of energy the Internet, the developed regions, the southeast gradually stepped up for dispatch from foreign news agency proportion, the unit participating in frequency modulation reduces relatively, will
Unit Primary frequency control ability in net is had higher requirement.
Summary of the invention
For solving the deficiency that prior art exists, the invention discloses primary frequency regulation of power network ability based on data analysis and monitor in real time
System and method, the analysis of single unit Primary frequency control ability is judged by the present invention by dispatching of power netwoks, it is possible to rest in fortune comprehensively
The overall fm capacity of unit, carries out the circuit excision of corresponding amplitude targetedly.
For achieving the above object, the concrete scheme of the present invention is as follows:
Primary frequency regulation of power network ability real-time monitoring system based on data analysis, including:
Signal picker module, delivers to the first function sets module, comparator mould respectively by the Real-time Load value of the unit collected
Block and the second function sets module；
The output of the first function sets module accesses the first input end of first selector module, the output of the second function sets module
Accessing the first input end of second selector module, the output of comparator module is respectively connected to first selector module and second and selects
The set end of device module；
First adder module, for the real-time primary frequency modulation upper limit first selector module of all grid-connected frequency modulation units exported
Value summation, obtains electrical network real-time primary frequency modulation higher limit；
Second adder module, for the real-time primary frequency modulation lower limit second selector module of all grid-connected frequency modulation units exported
Value summation, obtains electrical network real-time primary frequency modulation lower limit.
Further, described comparator module input signal be respectively as follows: unit Real-time Load value and set percentage ratio unit specified
Power, when i.e. thinking unit Real-time Load more than the unit rated power setting percentage ratio, for operating states of the units.
Further, first selector module and the second equal zero setting of input of second selector module.
Further, the first function sets module is for generating the unit counted according to upset test in different load interval
Primary frequency modulation higher limit function, i.e. unit primary frequency modulation maximum increase ability.
Further, the second function sets module is for generating the unit counted according to upset test in different load interval
Primary frequency modulation lower limit function, i.e. unit primary frequency modulation maximum reduce ability.
Primary frequency regulation of power network ability method for real-time monitoring based on data analysis, comprises the following steps:
Utilize signal picker module that the Real-time Load value of the unit collected is delivered to the first function sets module, comparator respectively
Module and the second function sets module；
The output of the first function sets module accesses the first input end of first selector module, the output of the second function sets module
Accessing the first input end of second selector module, the output of comparator module is respectively connected to first selector module and second and selects
The set end of device module；
The real-time primary frequency modulation higher limit that the first selector module of all grid-connected frequency modulation units exports is delivered to first adder module
Summation obtains electrical network real-time primary frequency modulation higher limit；
For the real-time primary frequency modulation lower limit that the second selector module of all grid-connected frequency modulation units exports is delivered to second adder
Module summation obtains electrical network real-time primary frequency modulation lower limit, by electrical network real-time primary frequency modulation higher limit and the real-time primary frequency modulation of electrical network
Lower limit i.e. can get current electric grid one piece frequency modulation space.
Further, in described first function sets module and the second function sets module, primary frequency modulation upper lower limit value obtains mode and is:
According to machine kludge installed capacity, 50%-100% rated power is averagely divided into 5 load intervals, according to national grid " fire
Power generator group primary frequency modulation test guidance " carry out upset test respectively, count respectively in its each comfortable different load interval
Primary frequency modulation upper lower limit value i.e. primary frequency modulation spatial value.
Further, if unit off-duty, then primary frequency modulation spatial value corresponding for all for this unit load intervals is set to " 0 ".
The present invention is by the reductive analysis of fm capacity under grid-connected unit difference operating mode, it is achieved to grid-connected unit one piece frequency modulation
The monitoring of ability, can realize dispatching of power netwoks and judge the analysis of single unit Primary frequency control ability, can rest in again fortune machine comprehensively
The overall fm capacity of group, carries out the circuit excision of corresponding amplitude targetedly, for ensureing that the safe and stable operation of electrical network provides
Ensure.
Beneficial effects of the present invention:
(1) present invention achieves the reductive analysis to the Primary frequency control ability in each load interval of unit, energy by upset test
The primary frequency modulation situation of enough grid-connected frequency modulation units of effective monitoring to each, it is achieved effective supervision and management；
(2) analysis of single unit Primary frequency control ability is judged by the present invention by dispatching of power netwoks, it is possible to rest in fortune unit comprehensively
Overall fm capacity, carry out targetedly corresponding amplitude circuit excision, for ensure electrical network safe and stable operation provide protect
Barrier, and then guarantee the electrical equipment of users and the safely, effectively operation of power equipment.
Accompanying drawing explanation
Fig. 1 is that primary frequency regulation of power network spatial analysis processes schematic diagram；
Fig. 2 is electrical network real-time primary frequency modulation space curve.
Detailed description of the invention:
The present invention is described in detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, a kind of primary frequency regulation of power network ability real-time monitoring system based on data analysis, including:
The Real-time Load value of the machine set PLC 1 collected is delivered to function sets module by described signal picker module S respectively
F1H(x), comparator module CMP, function sets module F1LX (), by function sets module F1H(x)、F1LX () obtains this respectively
Time unit real-time primary frequency modulation upper lower limit value；
Unit Real-time Load value in comparator module CMP compared with 30%Pe (the 30% of rated power), if at unit
In " RUN " state, then Real-time Load is naturally larger than 30%Pe, now comparator module CMP output switch amount signal " 1 ",
This signal is respectively connected to the set end S of selector module AXSEL1 and AXSEL2, and its respective output is switched to Z1 respectively
End, will the real-time primary frequency modulation higher limit of unit and lower limit △ P1HWith lower limit △ P1L；If unit is in " shutdown " shape
State, then Real-time Load is certainly less than 30%Pe, now comparator module CMP output switch amount signal " 0 ", and this signal is respectively
Access the set end S of selector module AXSEL1 and AXSEL2, its respective output is switched to Z2 end respectively, will
The real-time primary frequency modulation higher limit of unit and lower limit are all set to constant 0.
As noted above, deliver to the real-time primary frequency modulation higher limit of all grid-connected frequency modulation units adder Module Σ 1 is sued for peace,
Deliver to the real-time primary frequency modulation lower limit of all grid-connected frequency modulation units adder Module Σ 2 is sued for peace, then can draw now electrical network
Real-time primary frequency modulation space.
According to the requirement in Q/GDW 669-2011 " thermal power generation unit primary frequency modulation test guidance " technical standard, unit is joined
Can be any limitation as with the frequency modulation load variations upper amplitude limit of primary frequency modulation, but limited amplitude should not be too small, it is stipulated that be as follows:
(1)250MW>P0Fired power generating unit, limited amplitude >=10%P0；
(2)350MW≥P0The fired power generating unit of >=250MW, limited amplitude >=8%P0；
(3)500MW≥P0> fired power generating unit of 350MW, limited amplitude >=7%P0；
(4)P0> fired power generating unit of 500MW, limited amplitude >=6%P0。
A kind of primary frequency regulation of power network ability method for real-time monitoring based on data analysis, specifically includes following steps:
(1) grid-connected frequency modulation unit inductive statistics of Primary frequency control ability in each load interval；
(2) running status of frequency modulation unit grid-connected to electrical network is analyzed judging: if unit operation, then analyze its current load institute
The load segment at place, and the primary frequency modulation spatial value being presently in load interval corresponding is given；If unit off-duty, then
Primary frequency modulation spatial value corresponding for all for this unit load intervals is set to " 0 "；
(3) the overall primary frequency modulation spatial statistics in real time of electrical network: all for current time in regional power grid grid-connected frequency modulation units are given
Primary frequency modulation spatial value is added summation, then draw current electric grid one piece frequency modulation space.
In described step (1), the unit to frequency modulation grid-connected in regional power grid, according to machine kludge installed capacity, by 50%-100%Pe
(rated power) is averagely divided into 5 load intervals, according to national grid " thermal power generation unit primary frequency modulation test guidance "
Carry out upset test respectively, count primary frequency modulation upper lower limit value (the i.e. primary frequency modulation in its each comfortable different load interval respectively
Spatial value).
In region, North China as a example by certain 300MW fired power generating unit, the minimum 8%*300MW=24 of limit value in theory of its primary frequency modulation
MW, lower limit is-24MW.But due in actual motion, due to stable combustion needs and the high load capacity of underload section unit
Section main vapour pressure deficiency etc. causes actual Primary frequency control ability not reach lower limit in theory, and its actual primary frequency modulation upper lower limit value is such as
Shown in following table
According to standard, obtained the primary frequency modulation actually lower limit of every unit by conventional upset test after, and run according to it
State, obtain its cumulative and, then can draw the real-time primary frequency modulation space of electrical network, as shown in Figure 2.In Fig. 2, lines 1 are reasons
Opinion higher limit；Lines 2 are actually limit values；Lines 3 are Real-time Load values；Lines 4 are actual lower limit values；Lines 5 are under theory
Limit value.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope
System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay
Go out various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (8)
1. primary frequency regulation of power network ability real-time monitoring system based on data analysis, is characterized in that, including:
Signal picker module, delivers to the first function sets module, comparator mould respectively by the Real-time Load value of the unit collected
Block and the second function sets module；
The output of the first function sets module accesses the first input end of first selector module, the output of the second function sets module
Accessing the first input end of second selector module, the output of comparator module is respectively connected to first selector module and second and selects
The set end of device module；
First adder module, for the real-time primary frequency modulation upper limit first selector module of all grid-connected frequency modulation units exported
Value summation, obtains electrical network real-time primary frequency modulation higher limit；
Second adder module, for the real-time primary frequency modulation lower limit second selector module of all grid-connected frequency modulation units exported
Value summation, obtains electrical network real-time primary frequency modulation lower limit.
2. primary frequency regulation of power network ability real-time monitoring system based on data analysis as claimed in claim 1, is characterized in that, institute
State comparator module input signal be respectively as follows: unit Real-time Load value and set the unit rated power of percentage ratio, i.e. think unit
When Real-time Load is more than the unit rated power setting percentage ratio, for operating states of the units.
3. primary frequency regulation of power network ability real-time monitoring system based on data analysis as claimed in claim 1, is characterized in that, the
One selector module and the second equal zero setting of input of second selector module.
4. primary frequency regulation of power network ability real-time monitoring system based on data analysis as claimed in claim 1, is characterized in that, the
One function sets module is for generating the unit counted according to upset test primary frequency modulation higher limit letter in different load interval
Number, i.e. unit primary frequency modulation maximum increase ability.
5. primary frequency regulation of power network ability real-time monitoring system based on data analysis as claimed in claim 4, is characterized in that, the
Two function sets modules are for generating the unit counted according to upset test primary frequency modulation lower limit letter in different load interval
Number, i.e. unit primary frequency modulation maximum reduce ability.
6. primary frequency regulation of power network ability method for real-time monitoring based on data analysis, is characterized in that, comprise the following steps:
Utilize signal picker module that the Real-time Load value of the unit collected is delivered to the first function sets module, comparator respectively
Module and the second function sets module；
The output of the first function sets module accesses the first input end of first selector module, the output of the second function sets module
Accessing the first input end of second selector module, the output of comparator module is respectively connected to first selector module and second and selects
The set end of device module；
The real-time primary frequency modulation higher limit that the first selector module of all grid-connected frequency modulation units exports is delivered to first adder module
Summation obtains electrical network real-time primary frequency modulation higher limit；
For the real-time primary frequency modulation lower limit that the second selector module of all grid-connected frequency modulation units exports is delivered to second adder
Module summation obtains electrical network real-time primary frequency modulation lower limit, by electrical network real-time primary frequency modulation higher limit and the real-time primary frequency modulation of electrical network
Lower limit i.e. can get current electric grid one piece frequency modulation space.
7. primary frequency regulation of power network ability method for real-time monitoring based on data analysis as claimed in claim 6, is characterized in that, described
In first function sets module and the second function sets module, primary frequency modulation upper lower limit value acquisition mode is: install according to machine kludge
Capacity, is averagely divided into 5 load intervals by 50%-100% rated power, and according to national grid, " thermal power generation unit is once adjusted
Frequently test guidance " carry out upset test respectively, count the primary frequency modulation upper lower limit value in its each comfortable different load interval respectively
I.e. primary frequency modulation spatial value.
8. primary frequency regulation of power network ability method for real-time monitoring based on data analysis as claimed in claim 6, is characterized in that, if
Unit off-duty, then be set to " 0 " by primary frequency modulation spatial value corresponding for all for this unit load intervals.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113158536A (en) * | 2020-12-31 | 2021-07-23 | 江苏方天电力技术有限公司 | Primary frequency modulation capability calculation monitoring method and system |
| CN113361877A (en) * | 2021-05-24 | 2021-09-07 | 中广核研究院有限公司 | Statistical analysis method, device, equipment and medium for power grid frequency data |
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| EP2557647A2 (en) * | 2011-07-12 | 2013-02-13 | General Electric Company | Systems and devices for controlling power generation |
| CN104052072A (en) * | 2014-05-27 | 2014-09-17 | 国家电网公司 | Thermal power generating unit primary frequency modulation optimal control method and system based on amplitude keeping |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113158536A (en) * | 2020-12-31 | 2021-07-23 | 江苏方天电力技术有限公司 | Primary frequency modulation capability calculation monitoring method and system |
| CN113158536B (en) * | 2020-12-31 | 2022-06-28 | 江苏方天电力技术有限公司 | Primary frequency modulation capability calculation monitoring method and system |
| CN113361877A (en) * | 2021-05-24 | 2021-09-07 | 中广核研究院有限公司 | Statistical analysis method, device, equipment and medium for power grid frequency data |
| CN113361877B (en) * | 2021-05-24 | 2023-07-11 | 中广核研究院有限公司 | Statistical analysis method, device, equipment and medium for power grid frequency data |
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