CN113937787B - Primary frequency modulation and inertia frequency modulation control method, device and system based on wind power plant - Google Patents
Primary frequency modulation and inertia frequency modulation control method, device and system based on wind power plant Download PDFInfo
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- CN113937787B CN113937787B CN202111146223.5A CN202111146223A CN113937787B CN 113937787 B CN113937787 B CN 113937787B CN 202111146223 A CN202111146223 A CN 202111146223A CN 113937787 B CN113937787 B CN 113937787B
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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
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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
- 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
- H02J13/00006—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 information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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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
- 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
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a primary frequency modulation and inertia frequency modulation control method, device and system based on a wind power plant, wherein the method comprises the following steps: 1) Acquiring the voltage and current changes of the grid connection point to obtain the frequency change of the power grid; 2) When the amount of change in frequency is detected to exceed the dead zone, primary frequency modulation control is performed: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform; when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions. The invention has the advantages of self-adaptive control according to different working conditions, low cost, simple transformation, strong platform adaptability and the like.
Description
Technical Field
The invention mainly relates to the technical field of wind power generation, in particular to a primary frequency modulation and inertia frequency modulation control method, device and system based on a wind power plant.
Background
The installed capacity of the wind turbine generator is greatly increased, and great challenges are brought to the stability and safety of the power grid. In order to improve the stability of a power grid and the anti-interference capability of the frequency of the power grid, a wind farm is required to have a frequency modulation function and improve the frequency response speed. The frequency change is divided into frequency change quantity and frequency change rate, the frequency change quantity adjustment is called primary frequency modulation, the frequency change rate adjustment is called inertia frequency modulation, most of domestic wind power plants at present adopt only primary frequency modulation, the inertia frequency modulation has quick response speed, and the common primary frequency modulation cannot meet the requirements.
The invention patent application of application number CN202010123584.7 provides a comprehensive frequency modulation control method of a wind farm, which realizes primary frequency modulation and inertia frequency modulation by controlling the rotation speed of a generator, but can influence the power generation performance of the wind turbine while limiting the rotation speed of the generator, so that the wind turbine cannot be in an optimal power generation state, and the power generation efficiency is reduced; the invention patent of application number CN202110307193.5 adds a centralized energy storage device, and controls the device to perform primary frequency modulation and inertia frequency modulation, so that the technology adds a new energy storage device besides a frequency modulation unit, thereby greatly increasing the cost; the invention patent of application number CN202010486174.9 is to add a frequency modulation mode to a field level energy management platform, and collect frequency change of a grid-connected point of a wind farm through the field level energy management platform to perform primary frequency modulation and inertia frequency modulation, but some relevant indexes of a power grid may be severe, and in particular, response time of an energy management platform of an old wind farm may not meet requirements.
Specifically, for the requirements of different power grids, the schemes of the general frequency modulation unit can be divided into the following three types:
the first method is that the station-level AGC control system is optimized, the functions of a power grid frequency detection device, a frequency modulation control algorithm and the like are added in the AGC control system, the calculated target value is directly sent to an energy management platform, and then the energy management platform controls a fan to increase or decrease the active power. The scheme only needs to optimize the original AGC control system, does not need to modify the energy management platform and the fan end, has low added cost, but the optimization mode involves more links, and the performance index after optimization possibly cannot meet the requirements of a power grid, so that some technical difficulties exist.
The second method is that the energy management platform is optimized, a frequency modulation unit is additionally arranged, the frequency modulation unit is only communicated with the energy management platform, the frequency modulation unit sends the calculated power instruction to the energy management platform, and the locking relation between the AGC instruction and the frequency modulation instruction is processed in the energy management platform, so that the frequency modulation function can be realized, but the related requirements of inertia frequency modulation can not be met.
And thirdly, the frequency modulation unit is directly connected with the fan, the fan is directly controlled by the frequency modulation unit, and the fast frequency instruction is prioritized during the fast frequency. The scheme can reach the fastest response speed, but because the frequency modulation unit and the original energy management platform are in a parallel state, full-field active overshoot can be caused in the switching process of the frequency modulation unit and the original energy management platform, and the stability of a power grid is not facilitated.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems existing in the prior art, the invention provides a primary frequency modulation and inertia frequency modulation control method based on a wind power plant, which is used for carrying out self-adaptive control according to different working conditions, and a corresponding primary frequency modulation and inertia frequency modulation control device and system based on the wind power plant, which have low cost, simple transformation and strong platform adaptability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a primary frequency modulation and inertia frequency modulation control method based on a wind power plant comprises the following steps:
1) Acquiring the voltage and current changes of the grid connection point to obtain the frequency change of the power grid;
2) When the amount of change in frequency is detected to exceed the dead zone, primary frequency modulation control is performed: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform;
when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions.
Preferably, in step 2), the specific process of executing the primary frequency modulation control method is as follows:
when the frequency variation is detected to exceed the dead zone, calculating an active instruction according to the formula (1), sending the instruction to an energy management platform through MODBUS/TCP communication, enabling the energy management platform to respond to the active instruction preferentially, bypassing the AGC active instruction, and sending the instruction to a single fan for active adjustment;
wherein the method comprises the steps of
P in the formula 0 Representing the initial power of the wind farm, P n Representing rated power of wind farm, f d Represents a frequency dead zone, f represents the actual frequency of the power grid, f n Represents the rated frequency of the power grid, and delta% represents the primary frequency modulation slip.
Preferably, in step 2), in inertia frequency modulation control, when the change rate of the frequency exceeds a dead zone, and when the frequency disturbance is detected and the wind farm is in a working condition of unlimited load, an active command is directly sent to a single fan, and the single fan responds in place according to the self regulation capability after receiving the active command; and under other working conditions, calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform.
Preferably, the inertia frequency modulation control comprises the following specific processes: when the frequency disturbance is detected and the wind farm is in a working condition without limiting load, specifically, the inertia adjustment capability of each fan is obtained, after the active command of the whole farm is calculated, the functional power is distributed according to the inertia adjustment capability of each fan of the wind farm, the active command of a single fan is directly sent to the fan through MODBUS/TCP, when the fan receives the power of the fast frequency, the SCADA active command is bypassed, and the fast frequency power command of the fan is responded preferentially.
Preferably, in inertia frequency modulation control, under other working conditions, an active command is calculated through a formula (2), the command is sent to an energy management platform through MODBUS/TCP communication, the energy management platform responds to the active command preferentially, bypasses AGC active command, sends the command to a single fan for active adjustment,
wherein: ΔP represents the active power variation of the wind farm, T j Representing the inertial time constant of the wind farm, f n Represents the rated frequency of the power grid, f represents the actual frequency of the power grid, and P N Representing the rated power of the wind farm.
The invention also discloses a primary frequency modulation and inertia frequency modulation control device based on the wind power plant, which is used for executing the primary frequency modulation and inertia frequency modulation control method based on the wind power plant, and comprises a frequency modulation unit, an energy management platform and a dispatching master station, wherein the frequency modulation unit is respectively connected with the energy management platform and the dispatching master station, and the frequency modulation unit is directly communicated with a wind turbine generator.
Preferably, the frequency modulation unit comprises a power grid voltage and current acquisition module, a control module and a data communication module, wherein the power grid voltage and current acquisition module is used for acquiring grid-connected point voltage and current changes to obtain power grid frequency changes; the control module is respectively connected with the energy management platform, the dispatching master station and the wind turbine generator set through the data communication module, and is used for performing primary frequency modulation control or inertia frequency modulation control according to the power grid frequency change.
The invention further discloses a primary frequency modulation and inertia frequency modulation control system based on the wind power plant, which comprises the following steps:
the first module is used for acquiring the voltage and current changes of the grid-connected point to obtain the frequency changes of the power grid;
a second module for performing primary frequency modulation control when the detected change amount of the frequency exceeds the dead zone: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform; when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions.
The invention also discloses a computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being run by a processor, performs the steps of the wind farm based primary and inertia frequency modulation control method as described above.
The invention further discloses a computer device comprising a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, performs the steps of a wind farm based primary and inertia frequency modulation control method as described above.
Compared with the prior art, the invention has the advantages that:
the primary frequency modulation part in the control method is stable and reliable, and secondary fluctuation of power is not brought; the inertia frequency modulation part is adaptively adjusted to minimize the influence of power fluctuation of inertia frequency modulation.
According to the invention, the frequency modulation unit is connected in series between the dispatching master station and the energy management system, meanwhile, the frequency modulation unit can be directly communicated with the wind turbine, the wind turbine can simultaneously receive the instructions of the frequency modulation unit and the energy management platform, and the wind turbine can adaptively respond to the active instructions according to different working conditions, so that primary frequency modulation and inertia frequency modulation of the wind power plant are realized.
The novel frequency modulation unit is connected with the original AGC device in parallel and connected with the energy management platform, and meanwhile, the frequency modulation unit can directly control a single fan, so that accurate inertia frequency modulation is realized on the premise of meeting the requirement of primary frequency modulation. During inertia frequency modulation, self-adaptive control can be performed according to different working conditions, full-field active instructions can be selectively sent to an energy management platform, and a direct control fan can be selected to respond to inertia frequency modulation. The newly added frequency modulation unit is independent of the AGC system, the transformation cost is low, the transformation is simple, only a frequency modulation active instruction channel is needed to be added, the original active control logic of the energy management platform is not influenced, and the influence of frequency modulation power secondary fluctuation can be reduced to the minimum.
The invention can meet the strictest requirements of the power grid, well control the cost, has simple transformation and strong platform adaptability, and can be suitable for the frequency modulation requirements of various power grids in the whole country.
Drawings
Fig. 1 is a schematic structural diagram of a frequency modulation unit according to an embodiment of the present invention.
Fig. 2 is a flowchart of a frequency modulation method according to an embodiment of the present invention.
FIG. 3 is a flow chart of an embodiment of the inertia frequency modulation method of the present invention.
FIG. 4 is a flow chart of the control of the active command executed by the blower according to the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 2, the primary frequency modulation and inertia frequency modulation control method based on the wind farm in the embodiment includes the steps of:
1) Acquiring the voltage and current changes of the grid connection point to obtain the frequency change of the power grid;
2) When the amount of change in frequency is detected to exceed the dead zone, primary frequency modulation control is performed: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform;
when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions.
In the control method, the primary frequency modulation part is stable and reliable, and secondary fluctuation of power is not brought; the inertia frequency modulation part is adaptively adjusted to minimize the influence of power fluctuation of inertia frequency modulation.
In one embodiment, the primary frequency modulation control method specifically includes: primary frequency modulation is realized mainly by setting a frequency and active power broken line function, the function expression is shown in formula (1), wherein P in the formula 0 Representing the initial power of the wind farm, P n Representing rated power of a wind power plant, fd representing a frequency dead zone, f representing actual frequency of a power grid, fn representing rated frequency of the power grid, and delta% representing primary frequency modulation slip;
when the frequency variation is detected to exceed the dead zone, an active instruction is calculated through the above formula, the instruction is sent to an energy management platform through MODBUS/TCP communication, the energy management platform responds to the active instruction preferentially, bypasses the AGC active instruction, and the instruction is sent to a single fan for active adjustment.
In one embodiment, as shown in FIG. 3The inertia frequency modulation control method specifically comprises the following steps: when the change rate of the power grid frequency is larger than the dead zone range and the active output of the whole field is larger than 20% P N When inertia frequency modulation is satisfied, the change amount delta P of active power is satisfied with the formula (2), the response time of delta P is not more than 1s, and the allowable deviation is not more than + -2%P N ：
Wherein: ΔP represents the active power variation of the wind farm, T j Representing the inertial time constant of the wind farm, f n Represents the rated frequency of the power grid, f represents the actual frequency of the power grid, and P N Representing the rated power of the wind farm.
When the frequency is disturbed downwards and the wind farm is in a working condition without limiting load, the lifting of the active power of the whole farm cannot be realized through a primary frequency modulation control method, at the moment, the inertia adjustment capability of each fan needs to be obtained, after the active power command of the whole farm is calculated, the functional power is distributed according to the inertia adjustment capability of each fan of the wind farm, the active power command of a single fan is directly sent to the fan through MODBUS/TCP, and when the fan receives the power giving of the fast frequency, the SCADA active power command is bypassed, so that the fast frequency power command of the fan is responded preferentially. When the power control logic does not belong to the working conditions, the full-field active instruction is calculated and then sent to the energy management platform, and the energy management platform distributes power according to the original power control logic, as shown in fig. 4.
As shown in fig. 1, the invention also discloses a primary frequency modulation and inertia frequency modulation control device based on the wind power plant, which is used for executing the primary frequency modulation and inertia frequency modulation control method based on the wind power plant, and comprises a frequency modulation unit, an energy management platform and a dispatching master station, wherein the frequency modulation unit is respectively connected with the energy management platform and the dispatching master station, and the frequency modulation unit is directly communicated with a wind turbine generator. The frequency modulation unit comprises a power grid voltage and current acquisition module, a control module and a data communication module, wherein the power grid voltage and current acquisition module is used for acquiring grid-connected point voltage and current changes to obtain power grid frequency changes; the control module is respectively connected with the energy management platform, the dispatching master station and the wind turbine generator set through the data communication module, and is used for performing primary frequency modulation control or inertia frequency modulation control according to the frequency change of the power grid.
According to the invention, the frequency modulation unit is connected in series between the dispatching master station and the energy management system, meanwhile, the frequency modulation unit can be directly communicated with the wind turbine, the wind turbine can simultaneously receive the instructions of the frequency modulation unit and the energy management platform, and the wind turbine can adaptively respond to the active instructions according to different working conditions, so that primary frequency modulation and inertia frequency modulation of the wind power plant are realized.
The novel frequency modulation unit is connected with the original AGC device in parallel and connected with the energy management platform, and meanwhile, the frequency modulation unit can directly control a single fan, so that accurate inertia frequency modulation is realized on the premise of meeting the requirement of primary frequency modulation. During inertia frequency modulation, self-adaptive control can be performed according to different working conditions, full-field active instructions can be selectively sent to an energy management platform, and a direct control fan can be selected to respond to inertia frequency modulation. The newly added frequency modulation unit is independent of the AGC system, the transformation cost is low, the transformation is simple, only a frequency modulation active instruction channel is needed to be added, the original active control logic of the energy management platform is not influenced, and the influence of frequency modulation power secondary fluctuation can be reduced to the minimum.
The invention can meet the strictest requirements of the power grid, well control the cost, has simple transformation and strong platform adaptability, and can be suitable for the frequency modulation requirements of various power grids in the whole country.
In a specific embodiment, when the frequency modulation unit detects that the frequency variation exceeds the dead zone, the frequency modulation unit calculates a power instruction according to the frequency variation and sends the power instruction to the energy management platform, and the power of a single fan is controlled through the energy management platform;
when the frequency modulation unit detects that the frequency change rate exceeds the dead zone, specific working conditions are judged, and self-adaptive control is carried out according to different working conditions; specifically, when the frequency disturbance is detected and the wind power plant is in an unlimited load working condition, the frequency modulation unit directly sends an active command to a single fan, and the single fan responds to the active command rapidly according to the self regulation capacity after receiving the active command; the control method under other working conditions is the same as the variable frequency modulation method, the variable frequency modulation unit sends the variable frequency modulation method to the energy management platform, and the energy management platform controls a single fan.
The invention also discloses a computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being run by a processor, performs the steps of the wind farm based primary and inertia frequency modulation control method as described above.
The invention further discloses a computer device comprising a memory and a processor, the memory having stored thereon a computer program which, when executed by the processor, performs the steps of a wind farm based primary and inertia frequency modulation control method as described above.
The present invention may be implemented by implementing all or part of the procedures in the methods of the embodiments described above, or by instructing the relevant hardware by a computer program, which may be stored in a computer readable storage medium, and which when executed by a processor, may implement the steps of the embodiments of the methods described above. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, executable files or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. The memory may be used to store computer programs and/or modules, and the processor performs various functions by executing or executing the computer programs and/or modules stored in the memory, and invoking data stored in the memory. The memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid state storage device, etc.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (6)
1. A primary frequency modulation and inertia frequency modulation control method based on a wind power plant is characterized by comprising the following steps:
1) Acquiring the voltage and current changes of the grid connection point to obtain the frequency change of the power grid;
2) When the amount of change in frequency is detected to exceed the dead zone, primary frequency modulation control is performed: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform;
when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions;
in the step 2), the specific process of executing the primary frequency modulation control method is as follows:
when the frequency variation is detected to exceed the dead zone, calculating an active instruction according to the formula (1), sending the instruction to an energy management platform through MODBUS/TCP communication, enabling the energy management platform to respond to the active instruction preferentially, bypassing the AGC active instruction, and sending the instruction to a single fan for active adjustment;
wherein the method comprises the steps of(1)
In the middle ofRepresenting wind farm initial power, +.>Representing wind farm rated power, +.>Indicates the frequency dead zone +.>Representing the actual frequency of the grid>Indicating the rated frequency of the power grid, < >>Representing a primary frequency modulation difference rate;
in the step 2), in inertia frequency modulation control, when the change rate of the frequency exceeds a dead zone, judging whether the frequency is disturbed downwards and the wind power plant is in a working condition without load limitation, if so, directly sending an active command to a single fan, and responding in place according to the self regulating capability after the single fan is connected to the active command; otherwise, calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled through the energy management platform;
if the frequency is disturbed downwards and the wind farm is in the working condition of no load limitation, the specific control process is as follows: when the frequency disturbance is detected and the wind farm is in a working condition without limiting load, specifically, the inertia adjustment capability of each fan is obtained, after the active command of the whole farm is calculated, the functional power is distributed according to the inertia adjustment capability of each fan of the wind farm, the active command of a single fan is directly sent to the fan through MODBUS/TCP, when the fan receives the power of the fast frequency, the SCADA active command is bypassed, and the fast frequency power command of the fan is responded preferentially;
in inertia frequency modulation control, under other working conditions, an active command is calculated through a formula (2), the command is sent to an energy management platform through MODBUS/TCP communication, the energy management platform responds to the active command preferentially, bypasses AGC active command, sends the command to a single fan for active adjustment,
（2）
wherein:representing the active power variation of the wind power plant, +.>Representing the inertial time constant of a wind farm,/->Indicating the rated frequency of the power grid, < >>Representing the actual frequency of the grid>Representing the rated power of the wind farm.
2. The primary frequency modulation and inertia frequency modulation control device based on the wind power plant is used for executing the primary frequency modulation and inertia frequency modulation control method based on the wind power plant according to claim 1 and is characterized by comprising a frequency modulation unit, an energy management platform and a dispatching master station, wherein the frequency modulation unit is respectively connected with the energy management platform and the dispatching master station, and the frequency modulation unit is directly communicated with a wind turbine generator.
3. The primary frequency modulation and inertia frequency modulation control device based on the wind farm according to claim 2, wherein the frequency modulation unit comprises a power grid voltage and current acquisition module, a control module and a data communication module, wherein the power grid voltage and current acquisition module is used for acquiring grid-connected point voltage and current changes to obtain power grid frequency changes; the control module is respectively connected with the energy management platform, the dispatching master station and the wind turbine generator set through the data communication module, and is used for performing primary frequency modulation control or inertia frequency modulation control according to the power grid frequency change.
4. A wind farm based primary and inertia frequency modulation control system for performing the steps of the wind farm based primary and inertia frequency modulation control method of claim 1, comprising:
the first module is used for acquiring the voltage and current changes of the grid-connected point to obtain the frequency changes of the power grid;
a second module for performing primary frequency modulation control when the detected change amount of the frequency exceeds the dead zone: calculating a power instruction according to the change of the frequency, and sending the power instruction to an energy management platform, wherein the power of a single fan is controlled by the energy management platform; when the rate of change of the frequency is detected to exceed the dead zone, inertia frequency modulation control is performed: judging specific working conditions, and performing self-adaptive control according to different working conditions.
5. A computer readable storage medium, on which a computer program is stored which, when being executed by a processor, performs the steps of a wind farm based primary and inertia frequency modulation control method according to claim 1.
6. A computer device comprising a memory and a processor, the memory having stored thereon a computer program, characterized in that the computer program, when being executed by the processor, performs the steps of the wind farm based primary and inertia frequency modulation control method according to claim 1.
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| CN115208067B (en) * | 2022-09-15 | 2022-11-22 | 西安德纳检验检测有限公司 | New energy station inertia response detection method, device and system |
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