CN114696370A - Primary frequency modulation wind power cluster control system, method and device - Google Patents
Primary frequency modulation wind power cluster control system, method and device Download PDFInfo
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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
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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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Abstract
The invention discloses a primary frequency modulation wind power cluster control system, method and device, wherein the system comprises: the system comprises a wind power plant power control strategy determining module, a fan AGC active power adjusting capacity determining module and a cluster control module which are connected in sequence; the system can determine the wind energy margin of a single fan in an aerodynamic mode, and determine a wind power plant power control strategy based on the wind energy margin; determining an AGC active power regulation capacity value of the fan based on the ultra-short term wind energy margin and the current state of the fan; and performing unified coordination control according to the monitoring data, the reactive compensation data and the AGC active adjusting energy value of the fan so as to realize closed-loop control of the grid-connected point voltage of the wind power plant. The invention can realize a wind-electricity combined control strategy, is based on an electric power transmission center, analyzes and researches the output change characteristics and the regulation characteristics of the external input electric power of a power grid and various energy sources of a new energy station, and finally aims to realize the friendly grid connection of new energy.
Description
Technical Field
The invention relates to the technical field of wind power control, in particular to a primary frequency modulation wind power cluster control system, method and device.
Background
Wind power generation is one of the most mature and commercial development potential power generation modes in the field of renewable energy utilization. Due to the characteristic of abundant wind resources at sea and the urgent need of the application of offshore wind power development engineering all over the world at present, the problem of large-scale power transmission and grid connection of offshore wind power becomes a hot direction for wind power development and research.
At present, offshore wind power cluster control technology is divided into active control technology, reactive control technology and safety and stability control technology according to functions. The active control technology of the offshore wind power comprises the following steps: the method is mainly used for adjusting the offshore wind power output, so that the wind power cluster can operate in a maximum output tracking state and can participate in system peak regulation, frequency modulation and response to a power grid in emergency; the offshore wind power reactive power control technology comprises the following steps: in the aspect of offshore wind power reactive power control, the method is mainly used for reactive power optimization of wind power plants and power distribution networks containing wind power and reactive power overcompensation after fault removal. The offshore wind power safety and stability control technology comprises the following steps: the core of the emergency control type two-way and three-way defense lines of the electric power system is mainly used for cutting load, low-frequency/low-voltage load shedding and out-of-step disconnection of a cutter. The control modes of the three technologies are that the electric power collected by the wind power cluster equipment is detected, targeted electric power compensation or power regulation is carried out on the offshore wind power equipment end through the three modes according to the real-time electric power, and then the electric power is transmitted to the rear-end transmission equipment.
Several techniques commonly used at present have the following technical problems: due to the fact that the offshore environment is complex, the offshore wind power cluster equipment is unstable in power collection and power transmission, power control through the technical modes can only be achieved passively through power regulation and control according to the currently collected power, regulation and control efficiency is low, and the fact that offshore wind power operation and maintenance are limited by environmental conditions is considered, the regulation and control difficulty is high, and the regulation and control cost is high.
Disclosure of Invention
The invention provides a primary frequency modulation wind power cluster control system, a primary frequency modulation wind power cluster control method and a primary frequency modulation wind power cluster control device.
A first aspect of an embodiment of the present invention provides a primary frequency modulation wind power cluster control system, where the system includes:
the system comprises a wind power plant power control strategy determining module, a fan AGC active power adjusting capacity determining module and a cluster control module which are sequentially connected;
the cluster control module is respectively connected with a monitoring device of the fan, a reactive power compensation device and a booster station;
the wind power plant power control strategy determining module is used for determining the wind energy margin of a single fan in an aerodynamic mode and determining a wind power plant power control strategy based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin;
the active adjusting capacity determining module of the fan AGC is used for determining the AGC active adjusting capacity value of the fan based on the ultra-short-term wind energy margin and the current state of the fan;
and the cluster control module is used for acquiring the monitoring data uploaded by the monitoring device, the reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control command issued by the preset scheduling master station, and responding to the AVC voltage control command to perform unified coordination control so as to realize closed-loop control of the voltage of a grid-connected point of the wind power plant.
In a possible implementation manner of the first aspect, the system further includes:
the system comprises a real-time data acquisition function module, a core service processing function module, a control strategy issuing function module, a real-time state monitoring function module, an abnormal event warning function module and a data archiving and compressing function module.
A second aspect of the embodiments of the present invention provides a primary frequency modulation wind power cluster control method, where the method is applicable to the primary frequency modulation wind power cluster control system described above, and the method includes:
determining a wind energy margin of a single fan in an aerodynamic mode, and determining a wind power plant power control strategy based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin;
determining an AGC active power regulation capacity value of the fan based on the ultra-short term wind energy margin and the current state of the fan;
and collecting monitoring data uploaded by the monitoring device, reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control instruction issued by the preset scheduling master station, responding to the AVC voltage control instruction to carry out unified coordination control, and realizing closed-loop control of the voltage of a wind power plant grid-connected point.
In one possible implementation manner of the second aspect, the determining the wind energy margin of the single wind turbine in the aerodynamic mode includes:
and (3) establishing a microcosmic power meteorological pattern for each fan of the wind power plant by adopting aerodynamic pattern analysis to obtain the accurate wind energy margin of the wind power plant.
In a possible implementation manner of the second aspect, the unified coordination control includes: active-frequency droop characteristic control;
the step of responding the AVC voltage control instruction to carry out unified coordination control comprises the following steps:
the control of the active-frequency droop characteristic is realized in a preset quick frequency response system by imitating the primary frequency modulation function of a conventional power supply unit;
wherein, the primary frequency modulation function includes: the wind power plant realizes a quick frequency response function according to an active-frequency characteristic curve function, and the formula is as follows:
wherein: p0Is the initial value of active power, MW; pNFor boot capacity, MW; f. ofNSystem nominal frequency, Hz; f. ofdSystem frequency dead band, Hz; and delta% is the fast frequency response difference rate of the new energy.
In a possible implementation manner of the second aspect, the implementing the active-frequency droop characteristic control in the system with a preset fast frequency response includes:
and (4) according to the frequency modulation comprehensive frequency value calculated by the real-time frequency, transmitting the frequency modulation comprehensive frequency value to an energy management platform through preset high-speed communication management equipment to regulate and control the output of the electric field and the grid-connected voltage.
In one possible implementation manner of the second aspect, the method further includes:
after the energy management platform is finished, acquiring and judging whether the current frequency value is in a preset dead zone frequency area;
if the current frequency value is not outside the preset dead zone frequency region, repeating the frequency modulation operation;
and if the current frequency value is within the preset dead zone frequency region, setting the current frequency value to be in an open-loop state.
A third aspect of the embodiments of the present invention provides a primary frequency modulation wind power cluster control device, where the device includes:
the system comprises a workstation, a comprehensive intelligent control terminal and the primary frequency modulation wind power cluster control system which are sequentially connected;
the workstation is used for completing the functions of operation, maintenance, data monitoring control and data display of the primary frequency modulation wind power cluster control system;
the comprehensive intelligent control terminal is used for completing communication, data acquisition and information uploading, issuing control instructions to the unit and the reactive compensation equipment, executing a power control function, optimizing strategy calculation and providing strategy services.
Compared with the prior art, the wind power cluster control system, the method, the device, the electronic equipment and the computer readable storage medium with the primary frequency modulation provided by the embodiment of the invention have the beneficial effects that: the invention can realize a wind-electricity combined control strategy, is based on an electric power transmission center, analyzes and researches the output change characteristics and the regulation characteristics of the external input electric power of a power grid and various energy sources of a new energy station, and finally aims to realize the friendly grid connection of new energy.
Drawings
Fig. 1 is a schematic structural diagram of a primary frequency modulation wind power cluster control system according to an embodiment of the present invention;
fig. 2 is a structural diagram of an ac/dc power transmission grid structure according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a primary frequency modulation wind power cluster control method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an active-frequency droop characteristic of the new energy according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a fast frequency response system provided by an embodiment of the present invention;
fig. 6 is a topology diagram of the whole network with frequency modulation function according to an embodiment of the present invention;
FIG. 7 is a diagram of data processing logic provided by one embodiment of the present invention;
fig. 8 is a schematic structural diagram of a primary frequency modulation wind power cluster control device according to an embodiment of the present invention;
fig. 9 is a diagram of a wind power plant AGC \ AVC and primary frequency modulation hardware system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
At present, offshore wind power cluster control technology is divided into active control technology, reactive control technology and safety and stability control technology according to functions.
The active control technology of the offshore wind power comprises the following steps: the method is mainly used for adjusting the offshore wind power output, so that the wind power cluster can operate in a maximum output tracking state and can participate in system peak regulation, frequency modulation and response to a power grid in emergency. In the prior art, researches on wind power control are mostly concentrated on a single station, wherein active power control researches mostly focus on frequency response of a wind turbine generator and design of an AGC (automatic gain control) substation of the single station. The existing wind power plant active power distribution algorithm can be roughly divided into a weighting algorithm and a mathematical planning algorithm. The weighting algorithm comprises average distribution, capacity proportion distribution according to the wind power plant and proportion distribution according to a predicted value, and the algorithm is simple and easy to implement. The mathematical programming algorithm selects corresponding technical indexes as optimization targets and constraint conditions according to different requirements, and establishes an optimization distribution model for optimization scheduling. The active control of the wind power cluster is realized, the key points are the architecture design and the control strategy design of a control system, the design of the control system architecture comprehensively considers the conditions of the existing channel condition, the available equipment resource, the allowable investment sum and the like, the reliability of the system is ensured, and meanwhile, the expandability of the system in a future period of time is also considered. The research of the control strategy design mainly focuses on an active instruction distribution algorithm for each wind power plant of the wind power cluster. Such algorithms generally include weighted algorithms, mathematical programming, and planned queuing, among others. Generally, the active power distribution strategy of the wind power cluster fully considers the differences of installed capacity, actual wind conditions, regulation performance and the like of a wind power plant, reasonably arranges power limiting power on the premise of ensuring system safety, and fully utilizes the wind power receiving capacity of a power grid.
The offshore wind power reactive power control technology comprises the following steps: at present, in the aspect of offshore wind power reactive power control, the reactive power optimization of a wind power plant and a power distribution network containing wind power and the reactive power overcompensation problem after fault removal are mainly focused. In the reactive power optimization of offshore wind power, the main problem is how to influence the fluctuation of the output fan on the reactive power optimization; in the aspect of reactive power control of an offshore wind farm, a constant power factor control mode and a constant voltage control mode can be divided. The constant power factor mode control is widely applied, only the output of the fan is simply kept in a constant power factor state, the mode exerts the reactive potential of the fan such as DFIG to a certain extent, but does not exert the advantage that the reactive power of the fan can be flexibly controlled, the prior art tries to apply different control strategies to the reactive power coordination control of the wind power plant in the constant voltage mode, and reactive power distribution is carried out on each wind power generation set by adopting modes such as neural network control, equal proportion distribution control, simulated annealing algorithm control and the like. Furthermore, it is also conceivable to coordinate the wind turbines and the reactive power compensation devices, and it is common practice to provide dynamic reactive power compensation equipment, such as Static Var Compensators (SVCs) and static synchronous compensators (STATCOM), at the booster stations. The offshore wind farm cluster reactive voltage coordination control system is mainly used for maintaining voltage stability in an area and comprises a control framework and a control strategy. Aiming at the reactive power optimization control of the system, a 3-level voltage control system and a 2 nd level voltage control of a wind power cluster type 3 level are typically adopted, a set value given by the reactive power optimization of the system is received, hierarchical and partition coordination control is realized in the cluster, a reactive power output instruction of each station is given, and each station controls reactive power source equipment to realize feedback control. Regarding the control strategy, the focus is on how to realize the coordination control between the field group and the grid-connected point, how to reasonably distribute the reactive compensation tasks among the single fields, and the like. The control strategy for distributing the reactive compensation tasks among the single fields mainly comprises a mathematical programming algorithm (an improved algorithm based on a genetic algorithm and an interior point algorithm based on a filter set) and a general optimization algorithm based on prediction, and is based on the capacity proportion distribution of a wind power plant, the line load flow distribution and the equal grid loss micro-increment rate distribution algorithm.
The offshore wind power safety and stability control technology comprises the following steps: the wind power permeability of part of power grids is continuously improved, and when a system is greatly disturbed, how to complete the emergency coordination control of a conventional generator set, a wind turbine set and a load in a given time becomes a necessary problem. The core of the emergency control type two-way and three-way defense line of the electric power system mainly comprises a cutting machine load cutting, low-frequency/low-voltage load shedding and out-of-step disconnection means. The supporting technology for implementing the cluster coordination control has no prior art, and how to implement the hierarchical control on the wind power cluster from the system level and how to implement the multi-time scale coordination control on the wind power cluster.
Several techniques commonly used at present have the following technical problems: due to the fact that the offshore environment is complex, the offshore wind power cluster equipment is unstable in electric power collection and electric power transmission, power control through the technical modes can only be achieved passively according to the currently collected electric power, the control efficiency is low, the limitation of the offshore wind power operation and maintenance under the environmental condition is considered, the control difficulty is high, and the control cost is high.
In order to solve the above problem, the primary frequency modulation wind power cluster control system provided in the embodiments of the present application will be described and illustrated in detail through the following specific embodiments.
Referring to fig. 1, a schematic structural diagram of a primary frequency modulation wind power cluster control system provided in an embodiment of the present invention is shown.
The system comprises: the system comprises a wind power plant power control strategy determining module, a fan AGC active power adjusting capacity determining module and a cluster control module which are sequentially connected;
the cluster control module is respectively connected with a monitoring device of the fan, a reactive power compensation device and a booster station;
the wind power plant power control strategy determining module is used for determining the wind energy margin of a single fan in an aerodynamic mode and determining a wind power plant power control strategy based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin;
the active adjusting capacity determining module of the fan AGC is used for determining the AGC active adjusting capacity value of the fan based on the ultra-short-term wind energy margin and the current state of the fan;
and the cluster control module is used for acquiring the monitoring data uploaded by the monitoring device, the reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control command issued by the preset scheduling master station, and responding to the AVC voltage control command to perform unified coordination control so as to realize closed-loop control of the voltage of a grid-connected point of the wind power plant.
In one embodiment, through the cooperative work of the modules, various power parameter data of the front-end wind power equipment can be collected in real time, then the power parameter data are transmitted to the power regulation and control main station at the background, the power regulation and control main station analyzes the power parameter data and feeds back corresponding control instructions, and finally regulation and control operation is performed according to the control instructions, so that a fast and efficient regulation and control effect is realized.
Optionally, the cluster control module is configured to implement closed-loop control of the grid-connected point voltage of the wind farm and optimized operation of the power station through unified coordination control of adjusting means such as the reactive compensation device SVC/SVG and the on-load tap changer.
Optionally, the system further comprises:
the system comprises a real-time data acquisition function module, a core service processing function module, a control strategy issuing function module, a real-time state monitoring function module, an abnormal event warning function module and a data archiving and compressing function module.
Referring to fig. 2, a structure diagram of an ac/dc power transmission grid structure provided in an embodiment of the present invention is shown, and a final objective is to achieve friendly grid connection of new energy by analyzing and researching output variation characteristics and regulation characteristics of external input power of a power grid and various energy sources of a new energy station.
In this embodiment, the embodiment of the present invention provides a primary frequency modulation wind power cluster control system, which has the following beneficial effects: the invention can realize a wind-electricity combined control strategy, is based on an electric power transmission center, analyzes and researches the output change characteristics and the regulation characteristics of the external input electric power of a power grid and various energy sources of a new energy station, and finally aims to realize the friendly grid connection of new energy.
Referring to fig. 3, a schematic flow chart of a primary frequency modulation wind power cluster control method provided in an embodiment of the present invention is shown.
The method is suitable for the primary frequency modulation wind power cluster control system according to the embodiment.
As an example, the primary frequency modulation wind power cluster control method may include:
and S11, determining the wind energy margin of a single fan in an aerodynamic mode, and determining a power control strategy of a wind power plant based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin.
As an example, step S11 may include the following sub-steps:
and S111, establishing a micro dynamic meteorological model for each fan of the wind power plant by adopting aerodynamic mode analysis to obtain an accurate wind energy margin of the wind power plant.
And S12, determining an AGC active power regulation capacity value of the fan based on the ultra-short term wind energy margin and the current state of the fan.
And S13, collecting the monitoring data uploaded by the monitoring device, the reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control instruction issued by the preset scheduling master station, responding to the AVC voltage control instruction to carry out unified coordination control, and realizing closed-loop control of the voltage of the wind power plant grid-connected point.
In one embodiment, the unified coordination control includes: active-frequency droop characteristic control;
as an example, step S13 may include the following sub-steps:
s131, imitating the primary frequency modulation function of a conventional power supply unit, and realizing active-frequency droop characteristic control in a preset rapid frequency response system;
wherein, the primary frequency modulation function includes: the wind power plant realizes a quick frequency response function according to an active-frequency characteristic curve function, and the formula is as follows:
wherein: p0Is the initial value of active power, MW; pNFor boot capacity, MW; f. ofNSystem nominal frequency, Hz; f. ofdSystem frequency dead band, Hz; and delta% is the fast frequency response difference rate of the new energy.
Referring to fig. 4, a schematic diagram of an active-frequency droop characteristic of the new energy provided by an embodiment of the present invention is shown.
In one embodiment, the substep S131 may comprise:
s1311, frequency modulation comprehensive frequency values calculated according to the real-time frequency are issued to the energy management platform through the preset high-speed communication management equipment to regulate the output of the electric field and the grid-connected voltage.
In an embodiment, after sub-step S1311, the method may further include:
and S1312, after the energy management platform is finished, acquiring and judging whether the current frequency value is in a preset dead zone frequency area.
And S1313, repeating frequency modulation operation if the current frequency value is not outside the preset dead zone frequency area.
And S1314, if the current frequency value is in the preset dead zone frequency region, setting the current frequency value to be in an open-loop state.
In one embodiment, the rapid frequency response system calculates a frequency modulation comprehensive target value according to an AGC target value forwarded by an AGC system and acquired real-time frequency, and issues an energy management platform to execute the frequency modulation comprehensive target value through a special high-speed communication management device; after the execution is finished, judging the frequency value again, and if the frequency value is still outside the dead zone, continuing to calculate and carrying out frequency modulation again; and if the frequency dead zone is entered, the frequency modulation system is set to be an open loop, and the AGC system is remotely controlled to be closed loop.
The AGC system and the AVC system are divided into a database layer, a strategy and service processing layer, a communication layer and an interface layer, wherein the database layer is responsible for recording and storing real-time data and inquiring historical data; the strategy and service processing layer is used for establishing a control strategy model algorithm, a control processing logic, data processing, statistical analysis and report functions; the communication layer is used for communicating with other systems in the station; the interface layer provides a friendly man-machine interaction function with strong operability.
Specifically, the working process of the fast frequency response system comprises the following steps:
1) deploying a comprehensive intelligent control terminal and a rapid frequency response system, and configuring corresponding network, safety and equipment parameters;
2) a high-speed frequency measurement device is deployed, CT and PT signals of a power station are accessed, parameter information such as frequency, voltage and active power is acquired at high speed and high precision and uploaded to a quick frequency response terminal;
3) receiving an active power adjusting instruction forwarded by AGC in real time, and using the active power adjusting instruction as a calculation basis during frequency modulation;
4) the system is coordinated with an AGC system to realize the matching operation of frequency modulation and AGC regulation;
5) optimizing a communication network structure, and canceling a communication redundancy link to meet the speed requirement of quick frequency response;
6) the interface of the fan energy management platform is optimized, the direct communication between the rapid frequency response system and the fan energy management platform is realized, and the high-speed and high-precision communication of information such as the active power and the state of the unit is realized;
7) the method optimizes the reflection speed and the execution precision of the energy management platform and the fan, and has the following specific requirements: the active power can be adjusted by 10% Pn, wherein Pn is single machine power; the response lag time is not more than 500ms, the response time is not more than 10s, the regulation time is not more than 10s, and the positive and negative errors of the active control precision are not more than 1%; the fan communication interface and the communication response rate both need to meet the scheduling requirement;
8) adjusting rapid frequency response parameters according to the in-station conditions, and improving the calculation and control rate and precision; when frequency modulation is needed, an open-loop AGC system calculates a full-field comprehensive target value according to a latest target instruction and a rapid frequency response demand of AGC, comprehensively analyzes and calculates the full-field active power output capacity, generates an optimal control strategy, issues a regulation and control instruction and realizes a comprehensive frequency modulation target; and after the interval time is over, analyzing the current frequency again, and performing AGC function recovery or frequency modulation operation again.
Referring to fig. 5, a schematic diagram of a fast frequency response system provided by an embodiment of the present invention is shown;
the quick frequency response system calculates a frequency modulation comprehensive target value according to the AGC target value forwarded by the AGC system and the acquired real-time frequency, and issues an energy management platform to execute the frequency modulation comprehensive target value through special high-speed communication management equipment; after the execution is finished, judging the frequency value again, and if the frequency value is still outside the dead zone, continuing to calculate and carrying out frequency modulation again; and if the frequency dead zone is entered, the frequency modulation system is set to be open loop, and the AGC system is remotely controlled to be closed loop.
Referring to fig. 6, a topology diagram of an entire network of a frequency modulation function according to an embodiment of the present invention is shown, where the topology diagram of the entire network of the frequency modulation function is shown in fig. 6.
Referring to fig. 7, a data processing logic diagram provided by an embodiment of the invention is shown.
Wherein the data processing logic flow of the fast frequency response system comprises:
(1) based on real-time data of a fan, real-time data of a booster station, wind power prediction data and data of a reactive power compensation device;
(2) performing command distribution based on a wind speed-theoretical power data model and a control strategy model base;
(3) and (4) stably regulating and controlling the output of the electric field and the grid-connected voltage according to a real-time command issued by scheduling.
In this embodiment, the embodiment of the present invention provides a primary frequency modulation wind power cluster control method, which has the following beneficial effects: the invention can carry out multi-region multi-scene cluster coordination control on the offshore wind power with new energy and conventional energy through an improved AGC control method under the condition that the complexity of an AGC system is increased by the participation of the offshore wind power cluster.
The embodiment of the invention also provides a primary frequency modulation wind power cluster control device, and referring to fig. 8, a schematic structural diagram of the primary frequency modulation wind power cluster control device provided by the embodiment of the invention is shown.
As an example, the primary frequency modulation wind power cluster control device may include:
the system comprises a workstation, a comprehensive intelligent control terminal and a primary frequency modulation wind power cluster control system which are sequentially connected;
the workstation is used for completing the functions of operation, maintenance, data monitoring control and data display of the primary frequency modulation wind power cluster control system;
the comprehensive intelligent control terminal is used for completing communication, data acquisition and information uploading, issuing control instructions to the unit and the reactive compensation equipment, executing a power control function, optimizing strategy calculation and providing strategy services.
Referring to fig. 9, a hardware system diagram of a wind power plant AGC \ AVC and primary frequency modulation provided in an embodiment of the present invention is shown.
Specifically, the primary frequency modulation wind power cluster control device can communicate with a field booster station monitoring system, a wind power plant monitoring system and a reactive power compensation device to obtain real-time operation information, the data communication adopts a network mode or a serial port communication mode, the real-time operation information is uploaded to a main station system through a power scheduling data network, and meanwhile, an active/reactive power control instruction is received from the main station and forwarded to the wind power plant monitoring system, the reactive power compensation device and the like to be remotely adjusted and controlled.
It can be clearly understood by those skilled in the art that, for convenience and brevity, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Further, an embodiment of the present application further provides an electronic device, including: the wind power cluster control method comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein when the processor executes the program, the primary frequency modulation wind power cluster control method is realized.
Further, an embodiment of the present application further provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and the computer-executable instructions are used to enable a computer to execute the primary frequency modulation wind power cluster control method according to the embodiment.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A wind power cluster control system with primary frequency modulation, the system comprising: the system comprises a wind power plant power control strategy determining module, a fan AGC active power adjusting capacity determining module and a cluster control module which are sequentially connected;
the cluster control module is respectively connected with a monitoring device of the fan, a reactive power compensation device and a booster station;
the wind power plant power control strategy determining module is used for determining the wind energy margin of a single fan in an aerodynamic mode and determining a wind power plant power control strategy based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin;
the active adjusting capacity determining module of the fan AGC is used for determining the AGC active adjusting capacity value of the fan based on the ultra-short-term wind energy margin and the current state of the fan;
and the cluster control module is used for acquiring the monitoring data uploaded by the monitoring device, the reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control command issued by the preset scheduling master station, and responding to the AVC voltage control command to perform unified coordination control so as to realize closed-loop control of the voltage of a grid-connected point of the wind power plant.
2. The primary frequency modulated wind power cluster control system of claim 1, further comprising:
the system comprises a real-time data acquisition function module, a core service processing function module, a control strategy issuing function module, a real-time state monitoring function module, an abnormal event warning function module and a data archiving and compressing function module.
3. A primary frequency-modulated wind power cluster control method, which is applied to the primary frequency-modulated wind power cluster control system according to any one of claims 1-2, and comprises the following steps:
determining a wind energy margin of a single fan in an aerodynamic mode, and determining a wind power plant power control strategy based on the wind energy margin, wherein the wind energy margin comprises an ultra-short-term wind energy margin;
determining an AGC active power regulation capacity value of the fan based on the ultra-short term wind energy margin and the current state of the fan;
and collecting monitoring data uploaded by the monitoring device, reactive compensation data uploaded by the reactive compensation device and the AGC active adjusting capacity value, uploading the monitoring data, the reactive compensation data and the AGC active adjusting capacity value to a preset scheduling master station, receiving an AVC voltage control instruction issued by the preset scheduling master station, responding to the AVC voltage control instruction to carry out unified coordination control, and realizing closed-loop control of the voltage of a wind power plant grid-connected point.
4. The primary frequency modulation wind power cluster control method according to claim 3, wherein the determining the wind energy margin of a single fan in an aerodynamic mode comprises:
and (3) establishing a microcosmic power meteorological pattern for each fan of the wind power plant by adopting aerodynamic pattern analysis to obtain the accurate wind energy margin of the wind power plant.
5. The primary frequency modulation wind power cluster control method according to claim 3, wherein the unified coordination control comprises: active-frequency droop characteristic control;
the step of responding the AVC voltage control instruction to carry out unified coordination control comprises the following steps:
the control of the active-frequency droop characteristic is realized in a preset quick frequency response system by imitating the primary frequency modulation function of a conventional power supply unit;
wherein, the primary frequency modulation function includes: the wind power plant realizes a quick frequency response function according to an active-frequency characteristic curve function, and the formula is as follows:
wherein: p0Is the initial value of active power, MW; pNFor boot capacity, MW; f. ofNSystem nominal frequency, Hz; f. ofdSystem frequency dead band, Hz; and delta% is the fast frequency response difference rate of the new energy.
6. The primary frequency modulation wind power cluster control method according to claim 5, wherein the active-frequency droop characteristic control is realized in a preset fast frequency response system, and the method comprises the following steps:
and (4) according to the frequency modulation comprehensive frequency value calculated by the real-time frequency, transmitting the frequency modulation comprehensive frequency value to an energy management platform through preset high-speed communication management equipment to regulate and control the output of the electric field and the grid-connected voltage.
7. The primary frequency modulated wind power cluster control method of claim 6, further comprising:
after the energy management platform is finished, acquiring and judging whether a current frequency value is in a preset dead zone frequency area;
if the current frequency value is not outside the preset dead zone frequency region, repeating the frequency modulation operation;
and if the current frequency value is within the preset dead zone frequency region, setting the current frequency value to be in an open-loop state.
8. The utility model provides a wind-powered electricity generation cluster controlling means of primary control, its characterized in that, the device includes: the wind power cluster control system comprises a workstation, an integrated intelligent control terminal and the primary frequency modulation wind power cluster control system according to any one of claims 1-2 which are connected in sequence;
the workstation is used for completing the functions of operation, maintenance, data monitoring control and data display of the primary frequency modulation wind power cluster control system;
the comprehensive intelligent control terminal is used for completing communication, data acquisition and information uploading, issuing control instructions to the unit and the reactive compensation equipment, executing a power control function, optimizing strategy calculation and providing strategy services.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, characterized in that the processor implements the primary frequency modulation wind power cluster control method according to any one of claims 3 to 7 when executing the program.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the primary frequency modulation wind power cluster control method according to any one of claims 3 to 7.
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