CN112332428B - Adopt RTU to optimize AGC signal correction system - Google Patents

Adopt RTU to optimize AGC signal correction system Download PDF

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CN112332428B
CN112332428B CN202011138557.3A CN202011138557A CN112332428B CN 112332428 B CN112332428 B CN 112332428B CN 202011138557 A CN202011138557 A CN 202011138557A CN 112332428 B CN112332428 B CN 112332428B
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power
data
subsystem
analysis center
main control
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CN112332428A (en
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李卫东
王宏强
郭新生
李�杰
邵华波
夏冉冉
王涛
雷文涛
朱志军
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Huaneng Qingdao Thermal Power Co Ltd
Huaneng Shandong Power Generation Co Ltd
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Huaneng Qingdao Thermal Power Co Ltd
Huaneng Shandong Power Generation Co Ltd
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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation

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  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides an AGC signal correction system optimized by adopting an RTU, which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein basic data in an acquisition station of the data acquisition and monitoring subsystem and index data in the monitoring station are transmitted to the main control analysis center by the signal transmission subsystem, the basic data are subjected to type conversion by the signal conversion subsystem before being transmitted and received, the main control analysis center corrects a regional control deviation value by a delay correction module and a line loss correction module, and the output instruction of each generator set is distributed by a constraint scheduling module; through the delay correction module and the line loss correction module, the adjusted power grid frequency is closer to the target frequency, and the constraint scheduling module enables each generator set to more reasonably share the generated power required to be changed.

Description

Adopt RTU to optimize AGC signal correction system
Technical Field
The invention relates to the field of power generation control, in particular to an AGC signal correction system optimized by adopting an RTU.
Background
Automatic power generation control is one of the main contents of power system scheduling automation. The frequency of the power system is monitored and adjusted by utilizing a closed-loop control system consisting of a dispatching monitoring computer, a channel, a remote terminal, an execution (distribution) device, a generator set automation device and the like so as to control the output of a generator.
Now, a plurality of AGC systems have been developed, and through a great amount of search and reference, the existing AGC systems are found to be the systems disclosed in the publication numbers US08090061B1, JP2006173660A and KR101100965B1, and the inventions relate to an AGC unit control method, in particular to an AGC unit control method based on a real-time measuring system for the regulating performance of a generator set and a particle swarm optimization algorithm, and the AGC unit control method is under the CPS standard. After the AGC unit distribution strategy is improved by using the method, the adjusting targets of the units with different adjusting performances are more definite. The quick unit group is responsible for quick load fluctuation amount in the area, and the advantages of short response time and high regulation speed of the quick unit are fully utilized. The total regulation effect obtains a very ideal regulation effect no matter when the load is stable or the load fluctuates rapidly, the CPS index of the regional power grid is ensured to be in a qualified range and the power grid frequency is stable, and the method has good social benefits; meanwhile, the electricity purchasing cost is the lowest, and good economic benefit is obtained. However, these systems do not take into account and eliminate the influence of the delay and the line loss on the system, and do not effectively react to the allocation strategy of the unit according to the actual change of the unit.
Disclosure of Invention
The invention aims to provide an AGC signal correction system optimized by adopting an RTU (remote terminal Unit) aiming at the defects, and the invention adopts the following technical scheme in order to overcome the defects of the prior art:
an AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data;
further, the basic data comprises real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients;
further, the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are converted by the DA converter before being sent out, and the data and/or the commands are converted by the AD converter before being received;
furthermore, the main control analysis center comprises a region control module, a delay correction module, a line loss correction module and a constraint scheduling module;
further, the area control module calculates an area control deviation value through the received data to serve as an adjustment basis;
further, the formula for correcting the regional control deviation value by the delay correction module is as follows:
Figure GDA0002969191270000021
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1For the time difference between the collection of the actual frequency of the power grid and the receiving of the actual frequency data of the power grid by the main control analysis center,
the line loss correction module corrects the regional control deviation value according to the formula:
Figure GDA0002969191270000022
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iFor sending to the generator set i to execute the command to the generator set to generate powerThe time difference for the rate change to take effect;
further, the constraint scheduling module allocates the electric power needing to be changed to the corresponding generator sets according to different states of the generator sets;
further, a computer readable storage medium having instructions stored thereon, wherein the computer executes the instructions to optimize an AGC signal correction system using an RTU.
The beneficial effects obtained by the invention are as follows:
the RTU is adopted to collect and monitor data, time information is added to the collected data, and the main control analysis center makes corresponding correction on the ACE value according to the time information, so that the frequency of a power grid is more stable;
the main control analysis center is provided with a line loss correction module to perform corresponding line loss correction on the ACE value, so that errors caused by line loss are made up, and the frequency of a power grid is more stable;
when the master control analysis center distributes the variable power, the tasks are specifically distributed by considering the current power generation condition and the variable range of each generator set, so that each generator set can be always in a good power generation state.
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The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic diagram of the overall frame structure of the system of the present invention.
FIG. 2 is a schematic diagram of a signal correction and scheduling assignment process according to the present invention.
Fig. 3 is a schematic diagram of the net exchange power of the area according to the present invention.
Fig. 4 is a schematic diagram of the load optimization distribution of the present invention.
FIG. 5 is a diagram of RTU communication according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to embodiments thereof; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in detail below and will be apparent from the detailed description.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The first embodiment.
An AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data;
the basic data comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the main control analysis center comprises a region control module, a delay correction module, a line loss correction module and a constraint scheduling module;
the regional control module calculates a regional control deviation value through the received data to be used as an adjustment basis;
the formula that the time delay correction module corrects the regional control deviation value is as follows:
Figure GDA0002969191270000041
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1For the time difference between the time when the actual frequency of the power grid is collected and the time when the main control analysis center receives the actual frequency data of the power grid, the formula for correcting the regional control deviation value by the line loss correction module is as follows:
Figure GDA0002969191270000042
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the constraint scheduling module distributes electric power needing to be changed to the corresponding generator sets according to different states of the generator sets;
a computer readable storage medium having instructions stored thereon, wherein the computer executes the instructions to optimize an AGC signal correction system using an RTU.
Example two.
An AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data;
the basic data comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the main control analysis center comprises a region control module, a delay correction module, a line loss correction module and a constraint scheduling module;
the regional control module calculates a regional control deviation value through the received data to be used as an adjustment basis;
the formula that the time delay correction module corrects the regional control deviation value is as follows:
Figure GDA0002969191270000051
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1The time difference between the collection of the actual frequency of the power grid and the receiving of the actual frequency data of the power grid by the main control analysis centerThe formula for correcting the area control deviation value by the line loss correction module is as follows:
Figure GDA0002969191270000052
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the constraint scheduling module distributes electric power needing to be changed to the corresponding generator sets according to different states of the generator sets;
a computer readable storage medium having instructions stored thereon, wherein the computer executes the instructions to optimize an AGC signal rectification system using an RTU;
the system comprises a data acquisition and monitoring Subsystem (SCADA), a signal conversion subsystem, a signal transmission subsystem and a master control analysis center, wherein basic data in a collection station of the data acquisition and monitoring subsystem and index data in a monitoring station are transmitted when the index data are abnormal, the basic data are transmitted to the master control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before the basic data are transmitted and received, and the master control analysis center transmits corresponding instructions to carry out frequency regulation and load distribution on the power system after analyzing the received data;
the basic data acquired by the data acquisition and monitoring subsystem comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients, and the index data comprise power supply frequency and load frequency of the power grid;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the master control analysis center comprises a regional control module, a delay correction module, a line loss correction module and a constraint scheduling module, wherein the regional control module calculates a regional control deviation value ACE according to received data, and the formula is as follows:
ACE＝(Pa-Ps)+K(fa-fs) Δ P + K Δ f, wherein PaFor the present control region net exchange power, PsPlanning exchange power for the control area, K is the area control error coefficient, faFor the actual frequency of the grid, fsIs a target frequency;
Pa＝∑Pj-∑Pkwherein P isjIs the exchange power, P, of the adjacent area which transmits power to the local areakExchange power of an adjacent area receiving power from the local area;
the area control module outputs an instruction to adjust a power plant in the area according to the ACE value, when the ACE value is negative, the power generation needs to be increased, and when the ACE value is positive, the power generation needs to be reduced, and the load fluctuation of the power plant is automatically balanced;
the delay correction module is used for correcting the ACE value calculated by the area control module in delay error;
the errors due to the data transfer elapsed time are:
Figure GDA0002969191270000061
Δt1acquiring the actual frequency of the power grid, and acquiring the time difference between the actual frequency of the power grid and the actual frequency data of the power grid received by the master control analysis center;
the errors due to the latency of the execution of the instructions to take effect are:
Figure GDA0002969191270000071
wherein, Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the delay correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE1＝(ΔE1+ΔE2) The method comprises the following steps of/T, wherein T is the time difference of a power system;
the line loss correction module is used for correcting an ACE value calculated by the area control module, wherein the ACE value generates errors due to line loss energy, and the line loss rate is calculated by the following formula:
line loss rate Y (electric energy E supplied to payload in region)For supplying toElectric energy E consumed by the payload in the areaXiaoxiao (medicine for eliminating cough and asthma)) Electric energy E supplied to the payload in the regionFor supplying to*100％；
The line loss correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE2＝ACE/(1-Y)；
the ACE value obtained finally after time delay correction and line loss correction is as follows:
ACEfinal (a Chinese character of 'gan')＝ACE+ΔACE1+ΔACE2。
Example three.
An AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data;
the basic data comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the main control analysis center comprises a region control module, a delay correction module, a line loss correction module and a constraint scheduling module;
the regional control module calculates a regional control deviation value through the received data to be used as an adjustment basis;
the formula that the time delay correction module corrects the regional control deviation value is as follows:
Figure GDA0002969191270000081
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1For the time difference between the time when the actual frequency of the power grid is collected and the time when the main control analysis center receives the actual frequency data of the power grid, the formula for correcting the regional control deviation value by the line loss correction module is as follows:
Figure GDA0002969191270000082
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the constraint scheduling module distributes electric power needing to be changed to the corresponding generator sets according to different states of the generator sets;
a computer readable storage medium having instructions stored thereon, wherein the computer executes the instructions to optimize an AGC signal rectification system using an RTU;
the system comprises a data acquisition and monitoring Subsystem (SCADA), a signal conversion subsystem, a signal transmission subsystem and a master control analysis center, wherein basic data in a collection station of the data acquisition and monitoring subsystem and index data in a monitoring station are transmitted when the index data are abnormal, the basic data are transmitted to the master control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before the basic data are transmitted and received, and the master control analysis center transmits corresponding instructions to carry out frequency regulation and load distribution on the power system after analyzing the received data;
the basic data acquired by the data acquisition and monitoring subsystem comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients, and the index data comprise power supply frequency and load frequency of the power grid;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the master control analysis center comprises a regional control module, a delay correction module, a line loss correction module and a constraint scheduling module, wherein the regional control module calculates a regional control deviation value ACE according to received data, and the formula is as follows:
ACE＝(Pa-Ps)+K(fa-fs) Δ P + K Δ f, wherein PaFor the present control region net exchange power, PsPlanning exchange power for the control area, K is the area control error coefficient, faFor the actual frequency of the grid, fsIs a target frequency;
Pa＝∑Pj-∑Pkwherein P isjIs the exchange power, P, of the adjacent area which transmits power to the local areakExchange power of an adjacent area receiving power from the local area;
the area control module outputs an instruction to adjust a power plant in the area according to the ACE value, when the ACE value is negative, the power generation needs to be increased, and when the ACE value is positive, the power generation needs to be reduced, and the load fluctuation of the power plant is automatically balanced;
the delay correction module is used for correcting the ACE value calculated by the area control module in delay error;
the errors due to the data transfer elapsed time are:
Figure GDA0002969191270000091
Δt1acquiring the actual frequency of the power grid, and acquiring the time difference between the actual frequency of the power grid and the actual frequency data of the power grid received by the master control analysis center;
the errors due to the latency of the execution of the instructions to take effect are:
Figure GDA0002969191270000092
wherein, Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the delay correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE1＝(ΔE1+ΔE2) The method comprises the following steps of/T, wherein T is the time difference of a power system;
the line loss correction module is used for correcting an ACE value calculated by the area control module, wherein the ACE value generates errors due to line loss energy, and the line loss rate is calculated by the following formula:
line loss rate Y (electric energy E supplied to payload in region)For supplying toElectric energy E consumed by the payload in the areaXiaoxiao (medicine for eliminating cough and asthma)) Electric energy E supplied to the payload in the regionFor supplying to*100％；
The line loss correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE2＝ACE/(1-Y)；
the ACE value obtained finally after time delay correction and line loss correction is as follows:
ACEfinal (a Chinese character of 'gan')＝ACE+ΔACE1+ΔACE2；
The constraint scheduling module is used for distributing electric power needing to be changed to the corresponding generator set;
the upper limit value of the control of the generator set is CupThe lower limit value is controlled to be CdnThe current control value is CnowAnd the power-on fitness of the generator set is SAdding＝(Cup-Cnow)/(Cup-Cdn) The electricity reducing adaptability of the generator set is SReducing＝(Cnow-Cdn)/(Cup-Cdn)；
The constraint scheduling module counts the power-on fitness and the power-off fitness of all generator sets in the region, and when the ACE is used as the power-on fitness and the power-off fitness of all generator sets in the regionFinal (a Chinese character of 'gan')Selecting all the generator sets with the power reduction fitness larger than a first threshold value as the positive time, and recording as (A)1、 A2、...、An) Generator set AiThe power required to be adjusted is calculated by the following formula:
Figure GDA0002969191270000101
wherein, PiFor generator set AiThe maximum generated power that can be generated;
if the said Δ PiHas exceeded the generator set AiExpanding the range of the selected generator set into all generator sets with the power reduction adaptability degree larger than a second threshold value, calculating the power required to be adjusted of each generator set by using the same method, wherein the second threshold value is smaller than the first threshold value, and if the power adjustment range of the generator sets still does not meet the calculated delta P of the generator setsiExpanding the range of the selected generator set into all the generator sets in the area;
but ACEFinal (a Chinese character of 'gan')When the power is negative, the same method as the method is adopted, the difference is that the power-off fitness is changed into the power-on fitness, and the implementation mode of the method is clear to a person skilled in the art and is not described again;
and the master control analysis center sends the calculated power change amount of each generator set to the corresponding generator set, the generator sets automatically convert to corresponding adjustment parameters according to the power change amount, and new data are sent to the master control analysis center through the data acquisition and monitoring subsystem.
Example four.
An AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data;
the basic data comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the main control analysis center comprises a region control module, a delay correction module, a line loss correction module and a constraint scheduling module;
the regional control module calculates a regional control deviation value through the received data to be used as an adjustment basis;
the formula that the time delay correction module corrects the regional control deviation value is as follows:
Figure GDA0002969191270000111
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1Collecting the actual frequency of the power grid and the master control analysis centerReceiving the time difference between the actual frequency data of the power grid, wherein the formula for correcting the regional control deviation value by the line loss correction module is as follows:
Figure GDA0002969191270000112
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference from the execution of the command sent to the generator set i to the effective change of the generating power of the generator set;
the constraint scheduling module distributes electric power needing to be changed to the corresponding generator sets according to different states of the generator sets;
a computer readable storage medium having instructions stored thereon, wherein the computer executes the instructions to optimize an AGC signal rectification system using an RTU;
the system comprises a data acquisition and monitoring Subsystem (SCADA), a signal conversion subsystem, a signal transmission subsystem and a master control analysis center, wherein basic data in a collection station of the data acquisition and monitoring subsystem and index data in a monitoring station are transmitted when the index data are abnormal, the basic data are transmitted to the master control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before the basic data are transmitted and received, and the master control analysis center transmits corresponding instructions to carry out frequency regulation and load distribution on the power system after analyzing the received data;
the basic data acquired by the data acquisition and monitoring subsystem comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients, and the index data comprise power supply frequency and load frequency of the power grid;
the signal conversion subsystem comprises an AD converter and a DA converter, the data and/or the commands are firstly converted by the DA converter before being sent out, and then are converted by the AD converter before being received;
the master control analysis center comprises a regional control module, a delay correction module, a line loss correction module and a constraint scheduling module, wherein the regional control module calculates a regional control deviation value ACE according to received data, and the formula is as follows:
ACE＝(Pa-Ps)+K(fa-fs) Δ P + K Δ f, wherein PaFor the present control region net exchange power, PsPlanning exchange power for the control area, K is the area control error coefficient, faFor the actual frequency of the grid, fsIs a target frequency;
Pa＝∑Pj-∑Pkwherein P isjIs the exchange power, P, of the adjacent area which transmits power to the local areakExchange power of an adjacent area receiving power from the local area;
the area control module outputs an instruction to adjust a power plant in the area according to the ACE value, when the ACE value is negative, the power generation needs to be increased, and when the ACE value is positive, the power generation needs to be reduced, and the load fluctuation of the power plant is automatically balanced;
the delay correction module is used for correcting the ACE value calculated by the area control module in delay error;
the errors due to the data transfer elapsed time are:
Figure GDA0002969191270000131
Δt1acquiring the actual frequency of the power grid, and acquiring the time difference between the actual frequency of the power grid and the actual frequency data of the power grid received by the master control analysis center;
the errors due to the latency of the execution of the instructions to take effect are:
Figure GDA0002969191270000132
wherein, Δ PiThe power generation power, Δ t, to be changed for the generator set i2iTo carry out instructions to the generator set for sending to the generator set iThe time difference for the power generation change to take effect;
the delay correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE1＝(ΔE1+ΔE2) The method comprises the following steps of/T, wherein T is the time difference of a power system;
the line loss correction module is used for correcting an ACE value calculated by the area control module, wherein the ACE value generates errors due to line loss energy, and the line loss rate is calculated by the following formula:
line loss rate Y (electric energy E supplied to payload in region)For supplying toElectric energy E consumed by the payload in the areaXiaoxiao (medicine for eliminating cough and asthma)) Electric energy E supplied to the payload in the regionFor supplying to*100％；
The line loss correction module can finally obtain the ACE value to be corrected through the following formula:
ΔACE2＝ACE/(1-Y)；
the ACE value obtained finally after time delay correction and line loss correction is as follows:
ACEfinal (a Chinese character of 'gan')＝ACE+ΔACE1+ΔACE2；
The constraint scheduling module is used for distributing electric power needing to be changed to the corresponding generator set;
the upper limit value of the control of the generator set is CupThe lower limit value is controlled to be CdnThe current control value is CnowAnd the power-on fitness of the generator set is SAdding＝(Cup-Cnow)/(Cup-Cdn) The electricity reducing adaptability of the generator set is SReducing＝(Cnow-Cdn)/(Cup-Cdn)；
The constraint scheduling module counts the power-on fitness and the power-off fitness of all generator sets in the region, and when the ACE is used as the power-on fitness and the power-off fitness of all generator sets in the regionFinal (a Chinese character of 'gan')Selecting all the generator sets with the power reduction fitness larger than a first threshold value as the positive time, and recording as (A)1、 A2、...、An) Generator set AiThe power required to be adjusted is calculated by the following formula:
Figure GDA0002969191270000141
wherein, PiFor generator set AiThe maximum generated power that can be generated;
if the said Δ PiHas exceeded the generator set AiExpanding the range of the selected generator set into all generator sets with the power reduction adaptability degree larger than a second threshold value, calculating the power required to be adjusted of each generator set by using the same method, wherein the second threshold value is smaller than the first threshold value, and if the power adjustment range of the generator sets still does not meet the calculated delta P of the generator setsiExpanding the range of the selected generator set into all the generator sets in the area;
but ACEFinal (a Chinese character of 'gan')When the power is negative, the same method as the method is adopted, the difference is that the power-off fitness is changed into the power-on fitness, and the implementation mode of the method is clear to a person skilled in the art and is not described again;
the master control analysis center sends the calculated power change amount of each generator set to the corresponding generator set, the generator sets automatically convert to corresponding adjustment parameters according to the power change amount, and meanwhile, new data are sent to the master control analysis center through the data acquisition and monitoring subsystem;
the system comprises a Remote Terminal (RTU) installed in a remote station, wherein the remote terminal is used for collecting and monitoring operation data in the station and executing an instruction sent by a main control analysis center, the remote terminal and the main control analysis center adopt the same clock system, when the remote terminal collects the data, the collection time can be recorded, the collection time can be sent to the main control analysis center along with the collected data, when the main control analysis center receives the data, the receiving time can be recorded, and by comparing the collection time with the receiving time, the main control analysis center obtains a time difference delta t occupied by the transmission data1When the main control analysis center sends an instruction to the remote terminal, the first time information of the instruction is recorded, and when the remote terminal executes the instruction, the remote terminal enables the generator set to workAfter the generated power reaches a specified value, the remote terminal records and sends the second time information to the main control analysis center, and the main control analysis center calculates the time difference between the first time and the second time and subtracts delta t1As the delay time Δ t for the instruction to take effect2。
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
In conclusion, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that these examples are illustrative only and are not intended to limit the scope of the invention. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.

Claims (3)

1. An AGC signal correction system optimized by adopting an RTU (remote terminal Unit), which comprises a data acquisition and monitoring subsystem, a signal conversion subsystem, a signal transmission subsystem and a main control analysis center, wherein the data acquisition and monitoring subsystem is installed by depending on a remote terminal in a remote station, acquires basic data in the station and index data in the monitoring station, the index data sends out an alarm signal when abnormality occurs, the basic data is transmitted to the main control analysis center by the signal transmission subsystem, the type of the basic data is converted by the signal conversion subsystem before transmission and reception, and the main control analysis center sends out a corresponding instruction to carry out power regulation on a generator set after analyzing and correcting the received data; the basic data comprise real-time active power of the unit, a control upper limit value of the unit, a control lower limit value of the unit, a dead zone range of the unit, actual frequency of a power grid, power exchange values of adjacent areas and area control error coefficients; the signal conversion subsystem comprises an AD converter and a DA converter, wherein the data and/or the commands are converted by the DA converter before being sent out, and are converted by the AD converter before being received; the main control analysis center comprises a regional control module, a delay correction module, a line loss correction module and a constraint scheduling module; the regional control module calculates a regional control deviation value through received data to serve as an adjustment basis; the time delay correction module is characterized in that the formula for correcting the regional control deviation value is as follows:
Figure FDA0002969191260000011
where K is the area control error coefficient, Δ f is the frequency deviation, Δ t1For the time difference between the collection of the actual frequency of the power grid and the receiving of the actual frequency data of the power grid by the main control analysis center,
the line loss correction module corrects the regional control deviation value according to the formula:
Figure FDA0002969191260000012
wherein Δ PiThe power generation power, Δ t, to be changed for the generator set i2iThe time difference between the execution of the command to the genset i and the validation of the genset power generation change is sent to genset i.
2. The system of claim 1, wherein the constraint scheduling module assigns the electrical power to be changed to the respective genset based on different conditions of the genset.
3. A computer readable storage medium having instructions stored thereon, wherein execution of the instructions by the computer implements an RTU optimized AGC signal rectification system of claim 2.
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