CN111313466A - Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation - Google Patents
Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation Download PDFInfo
- Publication number
- CN111313466A CN111313466A CN202010159652.5A CN202010159652A CN111313466A CN 111313466 A CN111313466 A CN 111313466A CN 202010159652 A CN202010159652 A CN 202010159652A CN 111313466 A CN111313466 A CN 111313466A
- Authority
- CN
- China
- Prior art keywords
- power
- wind power
- agc
- wind
- regulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a sending end power grid AGC optimization regulation and control method and a system based on wind power priority regulation, wherein the method comprises the following steps: s1: calculating and solving an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line; s2: calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant; s3: selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value, and sequencing; s4: and determining the units participating in adjustment according to the ACE value, and cooperatively allocating the thermal power unit and the wind power plant to jointly complete AGC rapid adjustment. The method shortens the frequency stabilization time of the power grid by utilizing the rapidity of the power regulation of the wind power plant, ensures the ACE performance index of the power grid, and ensures the safe and stable operation of the power grid.
Description
Technical Field
The invention relates to a sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation, and belongs to the technical field of network source coordination control.
Background
In recent years, wind power in China develops rapidly, the wind power industry develops rapidly, but wind power has the characteristics of intermittence, volatility and uncertainty, a high wind power penetration power system faces severe frequency modulation burden along with the centralized access of large-scale wind power to a power grid, and the conventional power frequency control cannot meet the requirement of system stability. Meanwhile, the wind power scale is increased and accounts for the proportion of the traditional frequency modulation unit, the traditional frequency modulation unit cannot meet the increasing power quality requirement of the high wind power penetration power grid on the quality and flexibility of frequency modulation, and the high wind power penetration power grid urgently needs a new frequency modulation means and needs wind power to participate in frequency modulation. In order to eliminate the negative influence of wind power on the system frequency stability, some newly released power grid guide rules at home and abroad definitely provide auxiliary functions of a grid-connected wind power plant, such as rotation standby, inertia response, frequency regulation and the like, which are the same as those of a conventional power plant. The national standard GB/T19963 issued by China and 2011 technical regulation for accessing a wind power plant into a power system clearly indicate that the grid-connected wind power plant has the capacity of participating in frequency modulation, peak regulation and standby of the power system.
The power system must be operated within an allowable range around 50Hz, namely, the power system stably operates on the premise of real-time balance of power generation and power utilization, otherwise, the quality of the power of the system is reduced, and in extreme cases, the system is unstable. Automatic Generation Control (AGC) is an automatic integrated control system for realizing real-time balance between generated power and load of a power system and ensuring that the frequency of a power grid and the exchange power of a tie line are maintained at a specified value. In order to ensure safe and stable operation of a power grid, a large thermal power generating unit is required to be put into an Automatic Generation Control (AGC) function as a main force for frequency modulation and peak shaving of the current power grid.
The grid AGC performance is invoked at each AGC data acquisition cycle for evaluating the control behavior of the AGC, the evaluation criteria being mainly NERC (National Electrical Research Council, north american power system reliability association) behavior guidelines. The power grid AGC performance can calculate and count performance indexes of an operation Area and unit performance indexes, and can also calculate the qualification rate of frequency, exchange power, ACE (Area Control Error) and the like under different threshold values and different conditions (such as whether AGC is put into use or not). Fig. 1 shows a network source AGC coordination control schematic diagram, wherein ACE is calculated according to the network frequency and the tie line load flow, and after the ACE is generated, the ACE is distributed to each AGC unit according to a certain mechanism to act together to eliminate deviation, so as to achieve the stability of the network frequency.The NERC adopts standards A1 and A2 to evaluate the control performance of the power grid under the normal condition as early as 1973, and the contents are as follows: standard a 1: ACE in the control area must cross zero at least once within 10 min; standard a 2: the average value of ACE in the control area within 10min must be controlled within a specified range LaAnd (4) the following steps. The NERC requires that the control qualified rate of each control area reaching standards A1 and A2 is more than 90 percent. Thus, by implementing the a1, a2 standard, ACE in each control area is always close to zero, thereby ensuring a balance between power load and power generation, planned exchanges, and actual exchanges. The NERC introduced the evaluation standards of CPS1 and CPS2 control performance in 1996, and started to be formally implemented in 1998 to replace the original A1 and A2 standards. Similar to the A1 and A2 standards, the average value of ACE every 10min must be controlled within a specified range LaAnd (4) the following steps. At present, two sets of standards carried out by NERC are mainly adopted for evaluating the AGC control performance in China: the A1 and A2 standards, the CPS1 standards and the CPS2 standards are adopted by regional power grids such as North China and the like, the A1 standards and the A2 standards are adopted by regional power grids such as east China and the like, and the CPS1 standards and the CPS2 standards are adopted by regional power grids such as east China and the like.
Corresponding standards and real-time detailed rules are established according to the two detailed rules of China in regional power grids such as North China, northwest China and northeast China, for example, the thermal power generating unit of a steam drum boiler of a general direct-blowing pulverizing system is 1.5% of rated active power of the unit as specified in the Fine rules of implementation of grid-connected operation management of a power plant in North China; the normal thermal power generating unit with the intermediate storage type pulverizing system has 2% of rated active power of the unit. The active power regulation rate A1 value in FIG. 2 is typically set to 1% -2% PnMW/min(PnRated power of the unit), the unit increases or decreases the active power at the same rate. Domestic thermal power generating units are mainly 300MW and 600MW grade units, and the adjusting rate of most thermal power generating units is 4.5-10 MW/min. According to the regulation in GB/T19963 plus 2011, the active power change limit value of the wind power plant at 1min under the normal operation condition is as follows: the wind power field of less than 30MW is 3MW, the wind power field of 30-150MW is installed capacity/10, and the wind power field of more than 150MW is 15 MW. At present, the capacity of domestic wind power plants generally exceeds 49.5MW, and the proportion of 300MW scale is rapidly increased, namely the active power change rate of most wind power plants is 4.95-15MW/min, namelyIn an adjustable interval, the adjusting speed of the wind power plant is superior to that of a conventional thermal power generating unit.
At present, a domestic unit for AGC adjustment is generally a thermal power unit, and a wind power plant operates in a maximum power tracking control mode. The increase of the wind power generation capacity and the reduction of the power generation capacity of the thermal power generating unit easily cause the insufficient overall power regulation change capacity of the power grid of the unit in a certain time period in the day, the control deviation of the power grid area can not be controlled within a specified range in an average value in a certain time period, if the ACE is too large, a large number of running units need to be cut off in the power grid of the sending end, a certain amount of load is cut off in the power grid of the sending end, and if the ACE is too large, a chain reaction can occur to cause. Meanwhile, the wind power fluctuation can also cause the traditional thermal power generating unit to frequently act to respond to the change of the power grid frequency, so that mechanical devices are abraded, the service life of the frequency modulation unit is shortened, and the safety and the electric energy quality of the power grid are influenced.
Disclosure of Invention
In order to solve the problems, the invention provides an AGC optimization regulation and control method and system for a transmitting-end power grid based on wind power priority regulation, which can perform rapid power regulation by preferentially utilizing a wind power plant and ensure the stable operation of the power grid.
The technical scheme adopted for solving the technical problems is as follows:
on one hand, the sending end power grid AGC optimization regulation method based on wind power priority regulation provided by the embodiment of the invention comprises the following steps:
s1: calculating and solving an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
s2: calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
s3: selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value, and sequencing;
s4: and determining the units participating in adjustment according to the ACE value, and cooperatively allocating the thermal power unit and the wind power plant to jointly complete AGC rapid adjustment.
As a possible implementation manner of this embodiment, in step S1, the equation for calculating the ACE value is as follows:
ACE＝BΔf+ΔPtie
where B is the frequency deviation coefficient of the region, and Δ f is the frequency deviation between the grid measured frequency f and the rated frequency 50Hz, that is, Δ f is f-f0＝f-50；ΔPtieExchanging the actual power value P for the tietieaMinus the planning value PtiesCalculated deviation value
As a possible implementation manner of this embodiment, in step S2, the grid-connected operation wind farm ultra-short term power prediction value PPThe wind power generation power prediction value reported for the wind power plant for 15min-4h at least meets the specified requirements of NB/T31046 plus 2013 wind power prediction system function specification and Q/GDW10588 plus 2015 wind power prediction function specification standards.
As a possible implementation manner of this embodiment, in step S2, the calculation process of the adjustable power interval of the wind farm includes:
the wind power is in a maximum power tracking control mode in normal operation, and the upper limit of the output of the wind power plant is PHSelecting an ultra-short term power prediction value PPWind farm actual power PAA larger value of;
lower limit of wind power plant output PLSelected as 20% Pn，PnRated power of the wind turbine generator;
the down-regulation power interval of the adjustable power interval of the wind power plant is [ P ]L,PA]The up-regulated power interval is [ PA,PH]。
As a possible implementation manner of this embodiment, in step S3, the wind farm droop value is PD＝PA-PLWind farm up-regulation amplitude value is PI＝PH-PA。
As a possible implementation manner of this embodiment, in step S3, when ACE is positive, AGC power needs to be adjusted downward according to PDSorting from big to small; when ACE is negativeRequiring AGC power up, according to PISorting from large to small.
As a possible implementation manner of this embodiment, in step S3, the actual power P of the wind farmALess than 20% PnThe wind power station participating in AGC adjustment does not carry out AGC power down regulation; actual power P of wind farmAGreater than the upper limit P of the output of the wind power plantHAnd in time, the wind power station participating in AGC adjustment does not carry out AGC power up-regulation.
As a possible implementation manner of this embodiment, the process of step S4 includes the following steps:
when ACE is less than or equal to LdIn time, AGC adjustment is not needed, and an AGC command is kept unchanged;
when ACE>LdWhen, if
According to PDSequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
when ACE<-LdWhen, if
According to PISequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
wherein, PDiAdjusting down amplitude value, P, for the wind farm of the ith wind farmIiAmplitude modulation value L on the wind farm of the ith wind farmdThe ACE dead zone value is adjusted for the control area.
On the other hand, the sending-end power grid AGC optimization regulation and control system based on wind power priority regulation provided by the embodiment of the invention comprises:
the ACE value calculation module is used for calculating and obtaining an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
the adjustable power interval calculation module is used for calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
the sequencing module is used for selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value and sequencing;
and the adjusting unit determining module is used for determining the units participating in adjustment according to the determined value of the ACE, and cooperatively allocating the thermal power generating units and the wind power plant to jointly complete AGC rapid adjustment.
As a possible implementation manner of this embodiment, the sending-end power grid AGC optimization regulation and control system based on wind power priority regulation further includes:
the power grid monitoring module is used for calculating and solving an ACE value according to a real-time frequency value of a real-time monitored power grid and the exchange power of a tie line;
and the wind power plant monitoring module is used for calculating the adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant.
The technical scheme of the embodiment of the invention has the following beneficial effects:
the technical scheme of the embodiment of the invention comprises the steps of firstly calculating and obtaining an ACE value according to a real-time frequency value of a power grid monitored in real time and exchange power of a tie line; then, calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant; selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value, and sequencing; and finally, determining the units participating in adjustment according to the ACE value, and cooperatively allocating the thermal power unit and the wind power plant to jointly complete AGC rapid adjustment. According to the method, the wind power plant is preferentially utilized to perform rapid power regulation according to the ACE change amplitude in the regional power grid, and the thermal power generating unit and the wind power plant are cooperatively regulated to finish AGC regulation, so that the power regulation rapidity of the wind power plant is utilized, the frequency stabilization time of the power grid is shortened, the ACE performance index of the power grid is ensured, the action frequency of the traditional thermal power generating unit caused by the fluctuation of the wind power is effectively reduced, the abrasion of mechanical devices of the thermal power generating unit is reduced, the operation life of the frequency-modulated thermal power generating unit is prolonged.
Compared with the prior art, the invention has the following characteristics:
(1) according to the ACE change amplitude in the regional power grid, the method shortens the frequency stabilization time of the power grid by utilizing the rapidity of power regulation of the wind power station, ensures that the average value of the regional control deviation of the power grid in a certain period of time is controlled in a specified range, and ensures the safe and stable operation of the transmitting-end power grid.
(2) According to the invention, the wind power generation set is dynamically allocated to participate in AGC adjustment of the power grid, so that the action frequency of the traditional thermal power generation set caused by wind power fluctuation is reduced, the abrasion of mechanical devices of the thermal power generation set is reduced, and the service life of the frequency-modulated thermal power generation set is prolonged.
Description of the drawings:
FIG. 1 is a schematic diagram of a network source AGC co-deployment control;
FIG. 2 is a schematic diagram of a conventional thermal power unit AGC control;
FIG. 3 is a flow chart illustrating a method for optimal regulation and control of the sending-end power grid AGC based on wind prioritization in accordance with an exemplary embodiment;
FIG. 4 is a block diagram illustrating a transmit-end grid AGC optimization and regulation system based on wind override according to an exemplary embodiment.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
Fig. 3 is a flowchart illustrating a method for optimal regulation and control of the AGC of the transmission-end power grid based on wind power priority regulation according to an exemplary embodiment. As shown in fig. 3, the method for optimizing and controlling AGC of a transmitting-end power grid based on wind power priority adjustment according to the embodiment of the present invention includes the following steps:
s1: calculating and solving an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
s2: calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
s3: selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value, and sequencing;
s4: and determining the units participating in adjustment according to the ACE value, and cooperatively allocating the thermal power unit and the wind power plant to jointly complete AGC rapid adjustment.
As a possible implementation manner of this embodiment, in step S1, the equation for calculating the ACE value is as follows:
ACE＝BΔf+ΔPtie
where B is the frequency deviation coefficient of the region, and Δ f is the frequency deviation between the grid measured frequency f and the rated frequency 50Hz, that is, Δ f is f-f0＝f-50；ΔPtieExchanging the actual power value P for the tietieaMinus the planning value PtiesCalculated deviation value
The real-time frequency value of the power grid and the exchange power of the tie line can be obtained by monitoring the existing related power grid monitoring equipment in real time.
As a possible implementation manner of this embodiment, in step S2, the grid-connected operation wind farm ultra-short term power prediction value PPThe predicted value of the generated power of the wind power plant reported by the wind power plant for 15min-4h at least needs to meet the specified requirements of relevant standards such as NB/T31046 plus 2013 wind power prediction system function specification and Q/GDW10588 plus 2015 wind power prediction function specification. The ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant can be acquired by the existing grid-connected operation wind power plant monitoring equipment, and the actual power of the grid-connected operation wind power plant can be monitored.
As a possible implementation manner of this embodiment, in step S2, the calculation process of the adjustable power interval of the wind farm includes:
the wind power is in a maximum power tracking control mode in normal operation, and the upper limit of the output of the wind power plant is PHSelecting an ultra-short term power prediction value PPWind farm actual power PAA larger value of;
according to the GB/T19963 plus 2011 regulation, the lower limit of the continuous and smooth active power regulation is the rated power P of the wind turbine generatorn20% of the total wind power, so wind farm output lower limit PLSelected as 20% Pn，PnRated power of the wind turbine generator;
the down-regulation power interval of the adjustable power interval of the wind power plant is [ P ]L,PA]The up-regulated power interval is [ PA,PH]。
As a possible implementation manner of this embodiment, in step S3, the wind farm droop value is PD＝PA-PLWind farm up-regulation amplitude value is PI＝PH-PA。
As a possible implementation manner of this embodiment, in step S3, when ACE is positive, AGC power needs to be adjusted downward according to PDSorting from big to small; when ACE is negative, AGC power up regulation is needed according to PISorting from large to small.
As a possible implementation manner of this embodiment, in step S3, the actual power P of the wind farmALess than 20% PnThe wind power station participating in AGC adjustment does not carry out AGC power down regulation; actual power P of wind farmAGreater than the upper limit P of the output of the wind power plantHAnd in time, the wind power station participating in AGC adjustment does not carry out AGC power up-regulation.
As a possible implementation manner of this embodiment, the process of step S4 includes the following steps:
when ACE is less than or equal to LdIn time, AGC adjustment is not needed, and an AGC command is kept unchanged;
when ACE>LdWhen, if
According to PDSequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
when ACE<-LdWhen, if
According to PISequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
wherein, PDiAdjusting down amplitude value, P, for the wind farm of the ith wind farmIiAmplitude modulation value L on the wind farm of the ith wind farmdAdjustment-free ACE dead band value, L, for control areadThe value of (A) is generally in the range of 70-120 MW.
According to the embodiment, the wind power station is preferentially utilized to perform rapid power regulation according to the ACE change amplitude in the regional power grid, the thermal power generating unit and the wind power station are cooperatively used to complete AGC regulation, the rapidity of the power regulation of the wind power station is utilized, the frequency stabilization time of the power grid is shortened, the ACE performance index of the power grid is guaranteed, the frequency of actions of the traditional thermal power generating unit caused by the fluctuation of the wind power is effectively reduced, the abrasion of mechanical devices of the thermal power generating unit is reduced, the service life of the frequency modulation thermal power generating unit is prolonged, and.
FIG. 4 is a block diagram illustrating a transmit-end grid AGC optimization and regulation system based on wind override according to an exemplary embodiment. As shown in fig. 4, an AGC optimization regulation and control system for a transmitting-end power grid based on wind power priority regulation according to an embodiment of the present invention includes:
the ACE value calculation module is used for calculating and obtaining an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
the adjustable power interval calculation module is used for calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
the sequencing module is used for selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value and sequencing;
and the adjusting unit determining module is used for determining the units participating in adjustment according to the determined value of the ACE, and cooperatively allocating the thermal power generating units and the wind power plant to jointly complete AGC rapid adjustment.
As a possible implementation manner of this embodiment, the sending-end power grid AGC optimization regulation and control system based on wind power priority regulation further includes:
the power grid monitoring module is used for calculating and solving an ACE value according to a real-time frequency value of a real-time monitored power grid and the exchange power of a tie line;
and the wind power plant monitoring module is used for calculating the adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant.
In the following, an application example of the method provided by the invention in an actual power grid is given by taking a regional power grid as an example.
The thermal power in the power saving network mainly adopts a 300 MW-level positive pressure direct blowing type unit, and the unit power regulation rate is regulated according to the fine rules for grid-connected operation management implementation of power plants in North China: the thermal power unit of a steam drum furnace of a general direct-fired pulverizing system is 1.5 percent of the rated active power of the unit, and the thermal power unit of the general steam drum furnace with a middle storage bin pulverizing system is 2 percent of the rated active power of the unit. According to the regulation, the power regulation rate of the 300MW level direct blowing type unit is 4.5MW/min respectively. The dead zone value of the power grid ACE dynamic adjustment is 70, the ACE value is [ -70,70], namely when the ACE is more than or equal to-70 and less than or equal to 70, AGC adjustment is not carried out on a machine set in the power grid.
The power saving network has the power saving network with 95 seats in the wind power plant and the total capacity of 9554MW as long as 2019 and 10 months. The randomness of the wind power output is high, taking 10 months in 2019 as an example, the maximum output in the month is 6885MW, and the minimum output in the month is 117 MW. According to the regulation of GB/T19963 plus 2011, the active power change limit value of the wind power plant at 1min under the normal operation condition is as follows: the wind power field of less than 30MW is 3MW, the wind power field of 30-150MW is installed capacity/10, and the wind power field of more than 150MW is 15 MW. 91 wind power plants with capacity of more than 49.5MW and 37 wind power plants with capacity of more than 100MW in the power saving network, namely, the active power change rate of most wind power plants exceeds 4.95MW/min, the active power change rate of more than 38% of the wind power plants exceeds 10MW/min, namely, the regulation rate of the wind power plants is superior to that of a conventional thermal power generating unit in an adjustable interval.
At a certain time in 10 months and at a certain day, under the influence of the fault of the outgoing direct-current line, the frequency value of the power grid is increased to 50.09Hz, and the ACE value is 236MW after calculation and filtering processing and exceeds the dead zone value. At this time, the grid is connected to a wind farm 78, wherein 9 wind farms are provided for monitoring the actual power of the wind turbine at 20% or more of the rated power of the wind turbine, and the specific data are shown in table 1.
TABLE 120% PnThe above-operated 9 wind farm related data
Further, the adjustable power interval and the upper limit P of output of the wind power plant are obtainedHThe ultra-short term power prediction value P can be selectedPWind farm actual power PAA larger value of; according to the GB/T19963 plus 2011 regulation, the lower limit of the continuous and smooth active power regulation is the rated power P of the wind turbine generatorn20% of the total wind power, lower limit of output P of the wind farmLIs 20% Pn(ii) a The down-regulation power interval is [ P ]L,PA]The up-regulated power interval is [ PA,PH]The down regulation amplitude value of the wind power plant is PD＝PA-PLWind farm up-regulation amplitude value is PI＝PH-PABecause the frequency value of the power grid is 50.09Hz, the ACE value is 236MW after calculation and filtering, the power grid needs AGC power down regulation according to PDSorting from large to small, the specific data are shown in table 2.
TABLE 220% Pn9 wind power plant down-regulation interval statistical table operated above
Since at this time
ACE of less than 236MW, i.e.Triggering
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
The AGC power is adjusted downwards, and the thermal power generating unit finishes
The AGC power down part. That is to say, the AGC power down command is issued to 9 wind power plants with down-regulation capability and thermal power generating units participating in AGC regulation at the same time, and ACE deviation is rapidly eliminated. Actual operation results prove that compared with the conventional method of only depending on the adjustment of a thermal power generating unit, the adjustment time is shortened by over 20 percent, and the safety and stability level of a power grid is improved.
Compared with the prior art, the invention has the following characteristics:
(1) according to the ACE change amplitude in the regional power grid, the method shortens the frequency stabilization time of the power grid by utilizing the rapidity of power regulation of the wind power station, ensures that the average value of the regional control deviation of the power grid in a certain period of time is controlled in a specified range, and ensures the safe and stable operation of the transmitting-end power grid.
(2) According to the invention, the wind power generation set is dynamically allocated to participate in AGC adjustment of the power grid, so that the action frequency of the traditional thermal power generation set caused by wind power fluctuation is reduced, the abrasion of mechanical devices of the thermal power generation set is reduced, and the service life of the frequency-modulated thermal power generation set is prolonged.
The foregoing is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. A sending end power grid AGC optimization regulation and control method based on wind power priority regulation is characterized by comprising the following steps:
s1: calculating and solving an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
s2: calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
s3: selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value, and sequencing;
s4: and determining the units participating in adjustment according to the ACE value, and cooperatively allocating the thermal power unit and the wind power plant to jointly complete AGC rapid adjustment.
2. The method for AGC optimal regulation and control of a sending-end grid based on wind power priority regulation according to claim 1, wherein in step S1, the formula for calculating the ACE value is:
ACE＝BΔf+ΔPtie
where B is the frequency deviation coefficient of the region, and Δ f is the frequency deviation between the grid measured frequency f and the rated frequency 50Hz, that is, Δ f is f-f0＝f-50；ΔPtieExchanging the actual power value P for the tietieaMinus the planning value PtiesCalculated deviation value Δ Ptie＝Ptiea-Pties。
3. The method for AGC optimization regulation and control of the transmission-end power grid based on wind power priority regulation according to claim 1 or 2, characterized in that in step S2, the ultra-short term power predicted value P of the grid-connected operation wind power plantPThe predicted value of the generated power of the wind power plant reported by the wind power plant for 15min-4h at least meets the specified requirements of the standards of NB/T31046 plus 2013 wind power prediction system function specification and Q/GDW10588-2015 wind power prediction function specification.
4. The method for AGC optimization regulation and control of the transmission-end power grid based on wind power priority regulation according to claim 3, wherein in step S2, the calculation process of the adjustable power interval of the wind power plant comprises the following steps:
the wind power is in a maximum power tracking control mode in normal operation, and the upper limit of the output of the wind power plant is PHSelecting superShort term power prediction value PPWind farm actual power PAA larger value of;
lower limit of wind power plant output PLSelected as 20% Pn，PnRated power of the wind turbine generator;
the down-regulation power interval of the adjustable power interval of the wind power plant is [ P ]L,PA]The up-regulated power interval is [ PA,PH]。
5. The method for AGC optimization regulation and control of a transmission-end power grid based on wind power priority regulation as claimed in claim 4, wherein in step S3, the wind farm down-regulation amplitude is PD＝PA-PLWind farm up-regulation amplitude value is PI＝PH-PA。
6. The method for AGC optimization control of the transmission-end power grid based on wind power priority regulation as claimed in claim 5, wherein in step S3, when ACE is positive, AGC power is required to be adjusted down according to PDSorting from big to small; when ACE is negative, AGC power up regulation is needed according to PISorting from large to small.
7. The method for AGC optimization control of the transmission-end power grid based on wind power priority regulation according to claim 5, wherein in step S3, the actual power P of the wind farmALess than 20% PnThe wind power station participating in AGC adjustment does not carry out AGC power down regulation; actual power P of wind farmAGreater than the upper limit P of the output of the wind power plantHAnd in time, the wind power station participating in AGC adjustment does not carry out AGC power up-regulation.
8. The method for AGC optimization control of the transmission-end power grid based on wind power priority regulation according to claim 6, wherein the process of the step S4 comprises the following steps:
when ACE is less than or equal to LdIn time, AGC adjustment is not needed, and an AGC command is kept unchanged;
when ACE>LdWhen, if
According to PDSequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
when ACE<-LdWhen, if
According to PISequencing and selecting the front n wind power plants to eliminate ACE through AGC adjustment; if it is not
The AGC is completed by the wind power plant which is operated in a grid-connected mode and the thermal power generating unit together, and the AGC is completed by the wind power plant
Thermal power generating unit completion
A moiety;
wherein, PDiAdjusting down amplitude value, P, for the wind farm of the ith wind farmIiAmplitude modulation value L on the wind farm of the ith wind farmdThe ACE dead zone value is adjusted for the control area.
9. A sending end power grid AGC optimization regulation and control system based on wind power priority regulation is characterized by comprising:
the ACE value calculation module is used for calculating and obtaining an ACE value according to a real-time frequency value of a power grid monitored in real time and the exchange power of a tie line;
the adjustable power interval calculation module is used for calculating an adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant;
the sequencing module is used for selecting the wind power plants participating in AGC regulation according to the size of the adjustable power interval of the wind power plants and the size of the ACE value and sequencing;
and the adjusting unit determining module is used for determining the units participating in adjustment according to the determined value of the ACE, and cooperatively allocating the thermal power generating units and the wind power plant to jointly complete AGC rapid adjustment.
10. The sending-end power grid AGC optimization control system based on wind power priority regulation as claimed in claim 9, further comprising:
the power grid monitoring module is used for calculating and solving an ACE value according to a real-time frequency value of a real-time monitored power grid and the exchange power of a tie line;
and the wind power plant monitoring module is used for calculating the adjustable power interval of the wind power plant according to the ultra-short-term power predicted value and the actual power of the grid-connected operation wind power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159652.5A CN111313466A (en) | 2020-03-09 | 2020-03-09 | Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010159652.5A CN111313466A (en) | 2020-03-09 | 2020-03-09 | Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111313466A true CN111313466A (en) | 2020-06-19 |
Family
ID=71147971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010159652.5A Pending CN111313466A (en) | 2020-03-09 | 2020-03-09 | Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111313466A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886634A (en) * | 2021-01-14 | 2021-06-01 | 国网浙江省电力有限公司电力科学研究院 | Medium-and-long-term control modeling method for wind power plant and equivalent model |
| CN115313528A (en) * | 2022-10-11 | 2022-11-08 | 力高(山东)新能源技术股份有限公司 | AGC active power adjusting method for new energy power station |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104201700A (en) * | 2014-09-22 | 2014-12-10 | 哈尔滨工业大学 | Regional power grid thermal power frequency modulation unit configuration method considering wind power uncertainty fluctuation |
| CN104467015A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Interconnected network distribution type AGC control method used after wind and power centralized access |
| CN105207253A (en) * | 2015-09-15 | 2015-12-30 | 重庆大学 | AGC random dynamic optimization dispatching method taking wind power and frequency uncertainty into consideration |
| US20160247242A1 (en) * | 2013-08-28 | 2016-08-25 | San Diego Gas & Electric Company | Managing grid interaction with interconnect socket adapter configured for a wind power source |
| CN108649617A (en) * | 2018-07-04 | 2018-10-12 | 国网山东省电力公司电力科学研究院 | The power grid AGC of a kind of meter and wind-powered electricity generation prediction deviation cooperates with real-time control method |
-
2020
- 2020-03-09 CN CN202010159652.5A patent/CN111313466A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160247242A1 (en) * | 2013-08-28 | 2016-08-25 | San Diego Gas & Electric Company | Managing grid interaction with interconnect socket adapter configured for a wind power source |
| CN104201700A (en) * | 2014-09-22 | 2014-12-10 | 哈尔滨工业大学 | Regional power grid thermal power frequency modulation unit configuration method considering wind power uncertainty fluctuation |
| CN104467015A (en) * | 2014-12-12 | 2015-03-25 | 国家电网公司 | Interconnected network distribution type AGC control method used after wind and power centralized access |
| CN105207253A (en) * | 2015-09-15 | 2015-12-30 | 重庆大学 | AGC random dynamic optimization dispatching method taking wind power and frequency uncertainty into consideration |
| CN108649617A (en) * | 2018-07-04 | 2018-10-12 | 国网山东省电力公司电力科学研究院 | The power grid AGC of a kind of meter and wind-powered electricity generation prediction deviation cooperates with real-time control method |
Non-Patent Citations (2)
| Title |
|---|
| 叶林等: "基于分布式模型预测控制的风电场参与AGC控制方法", 《电网技术》 * |
| 林俐等: "基于优先顺序法的风电场限出力有功控制策略", 《电网技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112886634A (en) * | 2021-01-14 | 2021-06-01 | 国网浙江省电力有限公司电力科学研究院 | Medium-and-long-term control modeling method for wind power plant and equivalent model |
| CN115313528A (en) * | 2022-10-11 | 2022-11-08 | 力高(山东)新能源技术股份有限公司 | AGC active power adjusting method for new energy power station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103346577B (en) | Reduce wind energy turbine set AVC powerless control system and the method for wind power loss | |
| CN108092324B (en) | AGC control system and control method for wind power participating in peak shaving frequency modulation | |
| WO2022252382A1 (en) | Source-grid-load-storage networked coordinated frequency control method | |
| CN102354992A (en) | Reactive-power control method of wind power field | |
| CN112018785B (en) | Receiving-end power grid flywheel energy storage frequency modulation method and system based on frequency disturbance complementation | |
| CN112838603B (en) | Wind-solar energy storage and pumping multi-source energy AGC coordinated complementary control method and device | |
| CN113452092B (en) | Control method for improving AGC comprehensive frequency modulation performance index of thermal power generating unit | |
| CN109636247A (en) | A kind of fired power generating unit primary frequency modulation performance performance assessment criteria calculation method and its system | |
| CN109412210B (en) | Fine adjustment method for active power of wind turbine generator | |
| CN105896616A (en) | Thermal power generation unit real-time dispatching requirement determination method considering maximum new energy utilization | |
| CN111313466A (en) | Sending-end power grid AGC optimization regulation and control method and system based on wind power priority regulation | |
| CN111555337B (en) | Analysis method for improving direct current receiving capacity of direct current weak receiving end power grid | |
| CN112332462A (en) | Doubly-fed wind generating set primary frequency smooth adjustment method considering source-load power random fluctuation characteristic | |
| Zhao et al. | Transient voltage and transient frequency stability emergency coordinated control strategy for the multi-infeed HVDC power grid | |
| CN110581551A (en) | Method and device for wind turbine generator to participate in emergency control of power grid | |
| CN109802449B (en) | AGC unit dynamic allocation method and device based on active power gap | |
| CN111092443A (en) | Reactive emergency coordination control method for DFIG and SVC in wind power plant | |
| Chen et al. | Suppression strategy of ultra-low frequency oscillation in yunnan power grid with BESS | |
| CN110932321A (en) | Active control method for new energy station with energy storage function | |
| CN110417064B (en) | Dynamic regulation and control method and system for regulation rate based on active capacity monitoring of AGC unit | |
| CN115642643A (en) | Network source reactive voltage hierarchical coordination control method considering voltage coupling characteristic | |
| CN109274112B (en) | Energy storage power station scheduling method considering regional stability | |
| CN108155675B (en) | Wind power plant group power optimization scheduling method based on prediction information and operation state | |
| Wang et al. | Active Power Control Strategy of Wind Power Outgoing Channel Considering Multiple Constraints and Target Limit | |
| Ma et al. | Design of operation reserve classification system for China under new circumstances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200619 |
|
| RJ01 | Rejection of invention patent application after publication |