CN114498755A - Primary frequency modulation parameter frequency control method, device and equipment for wind power plant - Google Patents
Primary frequency modulation parameter frequency control method, device and equipment for wind power plant 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
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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
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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
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention relates to a method, a device and equipment for controlling primary frequency modulation parameter frequency of a wind power plant, wherein the method comprises the steps of constructing a simulation model of black start of an island power grid system; after the simulation model is operated, putting the simulation model into the island power grid system according to n-5% of load respectively to obtain n primary frequency modulation parameters meeting constraint conditions; inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring load parameters of the island power grid system in a black start process in real time; and selecting corresponding primary frequency modulation parameters according to the load parameters acquired in real time to control the operation of the island power grid system. The method improves the primary frequency modulation effect of the wind power plant of the island power grid system, is suitable for the situation that the load of the island power grid system is continuously changed during the black start, and enhances the reliability and the stability of the operation of the island power grid system.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a primary frequency modulation parameter frequency control method, device and equipment for a wind power plant.
Background
The cost of access to the land main network from the island grid is high and therefore the island grid is usually operated in isolated grid form. The island wind energy resource is abundant, and the island micro-grid using wind power as a main power supply has the characteristics of small rotational inertia, large influence of load change on the frequency of a power system and the like. In the black start process of the island microgrid, the frequency control of the wind power plant plays a crucial role in stabilizing the frequency of the power system, and the proportional gain coefficient and the integral time constant of the PI link of the primary frequency modulation are set according to the characteristics of the actual alternating current system.
The existing wind power plant primary frequency modulation control method is that according to the frequency of a grid-connected point, the actual active power and reactive power of a wind power plant outlet and the wind speed of each unit, which are collected by a wind power plant control power system, the maximum active power which can be generated by each unit of a wind power plant at the current wind speed is calculated by using a linear interpolation method, and the maximum active power which can be generated by a full wind power plant is calculated; calculating the active power reserve capacity required to be reserved when the wind power plant participates in primary frequency modulation; when the fluctuation of the power grid frequency is monitored, if the fluctuation exceeds a preset frequency dead zone, enabling a primary frequency modulation function, establishing a relation between the frequency and the active power through droop control, and calculating an active power reference value of a wind power plant; and taking the deviation between the reference value and the actual value of the active power of the wind power plant as the input quantity of Automatic Generation Control (AGC), calculating an active power issuing value of the wind power plant through a Proportional Integral (PI) controller, and issuing the active power issuing value to each controllable unit in the wind power plant.
According to the primary frequency modulation control method of the wind power plant, in a large power grid, the capacity of a power system is stable, PI link parameters can be kept unchanged, but the influence on the capacity of the power system along with the input of a load is large in the island black starting process, so that the frequency modulation effect difference of the same group of primary frequency modulation parameters on power systems with different capacities is large, namely the capacity of the power system is continuously changed and the rotational inertia of the power system is changed along with the input of the load in the black starting period of the power grid, and the control parameters of the existing primary frequency modulation control method of the wind power plant cannot be adjusted according to the change of the capacity of the power system, cannot adapt to the change of an alternating current system in the black starting period of the island power grid system, and cannot adapt to the modulation effect of frequency fluctuation caused by the input of the load.
Disclosure of Invention
The embodiment of the invention provides a primary frequency modulation parameter frequency control method, a primary frequency modulation parameter frequency control device and primary frequency modulation parameter frequency control equipment for a wind power plant, and aims to solve the technical problems that the existing primary frequency modulation control mode for the wind power plant cannot be adjusted along with the change of the capacity of a power system, and the modulation effect is poor.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a primary frequency modulation parameter frequency control method of a wind power plant is applied to an island power grid system and comprises the following steps:
constructing a simulation model of the black start of the island power grid system;
after the simulation model is operated, respectively putting the simulation model according to n-5% of island power grid system load to obtain n primary frequency modulation parameters meeting constraint conditions;
inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring load parameters of the island power grid system in a black start process in real time;
selecting corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system;
wherein n is a natural number from 1 to 20, and the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
Preferably, the primary frequency modulation parameter frequency control method for the wind power plant comprises the following steps: respectively putting the loads of the island power grid system with n x 5% into the simulation model, if a primary frequency modulation value which does not meet the constraint condition is obtained, adjusting the parameters of a PI (proportional integral) controller in the simulation model by adopting an optimization algorithm for the primary frequency modulation value, and acquiring a new primary frequency modulation value again until the obtained new primary frequency modulation value meets the constraint condition, wherein the new primary frequency modulation value is used as a primary frequency modulation parameter number.
Preferably, the minimum frequency threshold is 49.5Hz and the maximum frequency threshold is 50.5 Hz.
Preferably, the primary frequency modulation parameter frequency control method for the wind power plant comprises the following steps: and constructing a simulation model of the black start of the island power grid system in the simulation model of the power system.
Preferably, the island power grid system comprises M groups of wind turbines, a primary frequency modulation control device, a PI integral ratio controller and a load, the primary frequency modulation control device is connected with the wind turbines of each group, the primary frequency modulation control device is further connected with the PI integral comparison controller, and an output end of the PI integral comparison controller is connected with the load.
The invention also provides a primary frequency modulation parameter frequency control device of the wind power plant, which is applied to an island power grid system and comprises the following components: the system comprises a model building module, a parameter acquisition module, a load acquisition module and a regulation and control module;
the model building module is used for building a simulation model of the black start of the island power grid system;
the parameter acquisition module is used for respectively inputting the simulation model according to n-5% of island power grid system load after the simulation model operates to obtain n primary frequency modulation parameters meeting constraint conditions;
the load acquisition module is used for inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system and acquiring the load parameters of the island power grid system in a black start process in real time;
the regulation and control module is used for selecting corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system;
wherein n is a natural number from 1 to 20, and the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
Preferably, the parameter obtaining module is further configured to adjust the parameter of the PI controller in the simulation model by using an optimization algorithm for the primary frequency modulation value according to the obtained primary frequency modulation value that does not satisfy the constraint condition, and obtain a new primary frequency modulation value again until the obtained new primary frequency modulation value satisfies the constraint condition, and the new primary frequency modulation value is used as the primary frequency modulation parameter.
Preferably, the minimum frequency threshold is 49.5Hz and the maximum frequency threshold is 50.5 Hz.
Preferably, the model building module is used for building a simulation model of the black start of the island power grid system in the simulation model of the power system.
The invention also provides primary frequency modulation parameter frequency control equipment of the wind power plant, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
and the processor is used for executing the primary frequency modulation parameter frequency control method of the wind power plant according to the instruction in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: the primary frequency modulation parameter frequency control method, device and equipment for the wind power plant comprise the following steps: constructing a simulation model of the black start of the island power grid system; after the simulation model is operated, putting the simulation model into the island power grid system according to n-5% of load respectively to obtain n primary frequency modulation parameters meeting constraint conditions; inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring load parameters of the island power grid system in a black starting process in real time; and selecting the corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system. According to the primary frequency modulation parameter frequency control method of the wind power plant, the primary frequency modulation parameters under the loads of n different island power grid systems are obtained by building a simulation model, the load parameters are obtained by the island power grid systems in real time during black start, the corresponding primary frequency modulation parameters are selected according to the load parameters, the primary frequency modulation effect of the wind power plant of the island power grid systems is improved, the primary frequency modulation parameter frequency control method is suitable for the situation that the loads of the island power grid systems are continuously changed during the black start, the reliability and the stability of the operation of the island power grid systems are enhanced, and the technical problems that the existing primary frequency modulation control mode of the wind power plant cannot be adjusted along with the change of the capacity of the power system and the modulation effect is poor are solved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating steps of a primary frequency modulation parameter frequency control method for a wind farm according to an embodiment of the present invention;
fig. 2 is a framework diagram of an island grid system in the primary frequency modulation parameter frequency control method of a wind farm according to the embodiment of the present invention;
fig. 3 is a block diagram of a primary frequency modulation parameter frequency control device of a wind farm according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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.
Interpretation of terms of the present application:
the island power grid has no tie line with a land main grid, operates independently, and has the characteristics of small installed capacity, light load, low rotational inertia and the like, the limit range of frequency deviation is +/-0.2 Hz under the normal operation condition of the power system, and when the capacity of the power system is smaller, the limit range can be widened to +/-0.5 Hz.
The primary frequency modulation refers to an automatic control process that once the frequency of the power grid deviates from a rated value, a control system of a unit in the power grid automatically controls the increase and decrease of the active power of the unit, limits the change of the frequency of the power grid and enables the frequency of the power grid to be stable.
The black start refers to a process that after the whole power system is shut down due to failure, the power system is restarted to recover power supply; generally, according to the characteristics of different time periods in the recovery process, the complex process is divided into a black start stage, a rack recovery stage and a load recovery stage. In the black start process of the island power grid system, the recovered power generation capacity in the power system is small, the frequency deviation of the alternating current system exceeds the limit range of the frequency deviation due to overlarge load input, and the frequency constraint is one of the main factors for limiting the load recovery amount.
The PI proportional-integral controller is a linear controller, which forms a control deviation from a given value and an actual output value, and linearly combines the proportion and the integral of the deviation to form a control quantity to control a controlled object. The proportion regulation function is as follows: the deviation of the system is reflected in proportion, and once the deviation occurs in the power system, the proportion adjustment immediately generates adjustment action to reduce the deviation. The strength of the proportional adjustment effect depends on the proportional gain coefficient kp, the proportional effect is large, the adjustment can be accelerated, and the error can be reduced. Integral adjustment action: the steady state error of the power system is eliminated, and the error-free degree is improved. Because of the error, the integral adjustment is carried out until no difference exists, the integral adjustment is stopped, and the integral adjustment outputs a constant value. The strength of the integration depends on the integration time constant Ti, and the smaller the Ti value, the stronger the integration. Otherwise, if the Ti value is large, the integral action is weak, and the stability of the power system is reduced and the dynamic response is slowed down by adding integral adjustment.
The embodiment of the application provides a primary frequency modulation parameter frequency control method, a primary frequency modulation parameter frequency control device and primary frequency modulation parameter frequency control equipment for a wind power plant, which are applied to an island power grid system and used for solving the technical problems that the existing primary frequency modulation control mode for the wind power plant cannot be adjusted along with the change of the capacity of a power system, and the modulation effect is poor.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a primary frequency modulation parameter frequency control method for a wind farm according to an embodiment of the present invention, and fig. 2 is a framework diagram of a sea island grid system in the primary frequency modulation parameter frequency control method for the wind farm according to the embodiment of the present invention.
As shown in fig. 1 and fig. 2, an embodiment of the present invention provides a primary frequency modulation parameter frequency control method for a wind farm, which is applied to an island power grid system, where the island power grid system includes M groups of wind turbines 10, a primary frequency modulation control device 20, a PI integral ratio controller 30, and a load 40, the primary frequency modulation control device 20 is connected to the wind turbines 10 of each group, the primary frequency modulation control device 20 is further connected to the PI integral comparison controller 30, and an output end of the PI integral comparison controller 30 is connected to the load 40.
As shown in fig. 1, the primary frequency modulation parameter frequency control method for the wind farm includes the following steps:
s1, constructing a simulation model of black start of the island power grid system.
It should be noted that the black-start simulation model of the island power grid system is mainly constructed in the simulation model of the power system, and the simulation model is provided for the subsequent steps.
And S2, after the simulation model is operated, putting the simulation model into the island power grid system according to n-5% of load respectively to obtain n primary frequency modulation parameters meeting constraint conditions. Wherein n is a natural number of 1 to 20.
It should be noted that, the simulation model is started, that is, the wind power field in the island power grid system of the simulation model is operated in a grid-connected mode, and the wind power field is respectively put into the simulation model according to 5%, 10%, 15% >. 9.. 95%, 100% of the load of the island power grid system to obtain the primary frequency modulation parameter PI corresponding to the load of the island power grid system and meeting the constraint condition5％、PI10％、PI15％、PI20％、…、PI95％、PI100％For island grid systemsIn the actual operation process, the load parameters of the island power grid system continuously change along with the network, and the primary frequency modulation parameters corresponding to the load parameters are selected to regulate and control the island power grid system, so that the operation reliability and stability of the island power grid system are enhanced.
In the embodiment of the present invention, the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
It should be noted that the minimum frequency threshold and the maximum frequency threshold may be set according to requirements, and in this embodiment, the minimum frequency threshold may be selected to be 49.5Hz, and the maximum frequency threshold may be selected to be 50.5 Hz. The primary frequency modulation parameter refers to a proportional parameter and an integral parameter for regulating and controlling PI integral proportional control.
And S3, inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring the load parameters of the island power grid system in the black start process in real time.
It should be noted that, in step S3, the primary frequency modulation parameters obtained in step S2 under different percentages of sea island power grid system loads are input into the primary frequency modulation control device of the sea island power grid system, and the load parameters of the sea island power grid system during the black start process are obtained in real time, so that the primary frequency modulation parameters corresponding to the load parameters are selected according to the load parameters obtained in real time during the black start process of the sea island power grid system during the black start process.
And S4, selecting corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system.
It should be noted that, in step S4, the primary frequency modulation parameters obtained in step S2 at different island grid system load levels are placed in the primary frequency modulation control device, the load parameters of the island grid system are obtained in real time according to the black start process, the primary frequency modulation parameters are switched according to the load parameters by inputting the corresponding primary frequency modulation parameters according to the load parameters, the primary frequency modulation parameters are adapted to the change of the system load of the island grid system during the black start process, the insufficient modulation effect of frequency fluctuation caused by the load input is avoided, and the load input is followed by the primary frequency modulation parametersThe frequency of the power grid system is over-adjusted, so that the frequency is unstable. In this embodiment, the n primary frequency modulation parameters are obtained corresponding to different load levels of the island power grid system, and the primary frequency modulation parameter corresponding to the n primary frequency modulation parameters is selected by obtaining the load level of the island power grid system in real time (for example, if the load parameter is 20% of the load of the island power grid system, then the primary frequency modulation parameter selects PI20％) The method is suitable for the situation that the load of the island power grid system is changed continuously during the black start, and the primary frequency modulation parameters under different load levels are adjusted, so that the frequency stability of the island power grid system is guaranteed, and the reliability and the stability of the operation of the island power grid system are enhanced.
The invention provides a primary frequency modulation parameter frequency control method for a wind power plant, which comprises the following steps: constructing a simulation model of the black start of the island power grid system; after the simulation model is operated, putting the simulation model into the island power grid system according to n-5% of load respectively to obtain n primary frequency modulation parameters meeting constraint conditions; inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring load parameters of the island power grid system in a black start process in real time; and selecting the corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system. According to the primary frequency modulation parameter frequency control method of the wind power plant, the primary frequency modulation parameters under the loads of n different island power grid systems are obtained by building a simulation model, the load parameters are obtained by the island power grid systems in real time during black start, the corresponding primary frequency modulation parameters are selected according to the load parameters, the primary frequency modulation effect of the wind power plant of the island power grid systems is improved, the primary frequency modulation parameter frequency control method is suitable for the situation that the loads of the island power grid systems are continuously changed during the black start, the reliability and the stability of the operation of the island power grid systems are enhanced, and the technical problems that the existing primary frequency modulation control mode of the wind power plant cannot be adjusted along with the change of the capacity of the power system and the modulation effect is poor are solved.
In an embodiment of the invention, the method for controlling the frequency of the primary frequency modulation parameter of the wind power plant comprises the following steps: respectively putting the loads of the island power grid system into the simulation model according to n-5%, if a primary frequency modulation value which does not meet the constraint condition is obtained, adjusting the parameters of a PI (proportional integral) controller in the simulation model by adopting an optimization algorithm for the primary frequency modulation value, and acquiring a new primary frequency modulation value again until the obtained new primary frequency modulation value meets the constraint condition, wherein the new primary frequency modulation value is used as a primary frequency modulation parameter.
It should be noted that the optimization algorithm may be a particle swarm algorithm, a genetic algorithm, or the like, which is not described herein.
In the embodiment of the invention, in the process of acquiring the primary frequency modulation parameter meeting the constraint condition from the simulation model, the primary frequency modulation value obtained by putting the load of the island power grid system into the simulation model does not meet the constraint condition, if the primary frequency modulation value obtained by putting the load of the island power grid system into the simulation model does not meet the constraint condition, the parameter of the PI controller of the island power grid system in the simulation model needs to be adjusted by adopting an optimization algorithm until the adjusted primary frequency modulation value meets the constraint condition, and the primary frequency modulation value meeting the constraint condition is taken as the primary frequency modulation parameter, so that the primary frequency modulation parameter is taken as the optimal primary frequency modulation parameter of the wind farm at the corresponding load level of the island power grid system.
Example two:
fig. 3 is a block diagram of a primary frequency modulation parameter frequency control device of a wind farm according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention further provides a primary frequency modulation parameter frequency control device for a wind farm, which is applied to an island grid system, and includes: the system comprises a model construction module 101, a parameter acquisition module 102, a load acquisition module 103 and a regulation and control module 104;
the model building module 101 is used for building a simulation model of the black start of the island power grid system;
the parameter acquisition module 102 is used for respectively inputting the simulation models according to n × 5% of island power grid system loads after the simulation models are operated to obtain n primary frequency modulation parameters meeting constraint conditions;
the load acquisition module 103 is used for inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system and acquiring the load parameters of the island power grid system in the black start process in real time;
the regulation and control module 104 is used for selecting a corresponding primary frequency modulation parameter from the primary frequency modulation control device according to the load parameter acquired in real time to control the operation of the island power grid system;
wherein n is a natural number from 1 to 20, and the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
In this embodiment of the present invention, the parameter obtaining module 102 is further configured to, according to the obtained primary frequency modulation value that does not satisfy the constraint condition, adjust the parameter of the PI controller in the simulation model by using an optimization algorithm for the primary frequency modulation value, and obtain a new primary frequency modulation value again until the obtained new primary frequency modulation value satisfies the constraint condition, where the new primary frequency modulation value is used as the primary frequency modulation parameter.
In an embodiment of the invention, the minimum frequency threshold is 49.5Hz and the maximum frequency threshold is 50.5 Hz.
In the embodiment of the present invention, the model building module 101 is configured to build a simulation model of black start of the island power grid system in the simulation model of the power system.
It should be noted that the modules in the second embodiment correspond to the steps in the first embodiment, and the contents of the steps in the first embodiment are described in detail in the first embodiment, and the contents of the modules in the second embodiment are not described in detail in this second embodiment.
Example three:
the embodiment of the invention provides primary frequency modulation parameter frequency control equipment for a wind power plant, which comprises a processor and a memory, wherein the processor is used for processing primary frequency modulation parameters;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the primary frequency modulation parameter frequency control method of the wind power plant according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above-mentioned embodiment of the method for controlling the frequency of the primary frequency modulation parameter of the wind farm according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A primary frequency modulation parameter frequency control method of a wind power plant is applied to an island power grid system and is characterized by comprising the following steps:
constructing a simulation model of the black start of the island power grid system;
after the simulation model is operated, respectively putting the simulation model according to n-5% of island power grid system load to obtain n primary frequency modulation parameters meeting constraint conditions;
inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system, and acquiring load parameters of the island power grid system in a black start process in real time;
selecting corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system;
wherein n is a natural number from 1 to 20, and the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
2. The primary frequency modulation parameter frequency control method of a wind farm according to claim 1, comprising: respectively putting the loads of the island power grid system with n x 5% into the simulation model, if a primary frequency modulation value which does not meet the constraint condition is obtained, adjusting the parameters of a PI (proportional integral) controller in the simulation model by adopting an optimization algorithm for the primary frequency modulation value, and acquiring a new primary frequency modulation value again until the obtained new primary frequency modulation value meets the constraint condition, wherein the new primary frequency modulation value is used as a primary frequency modulation parameter.
3. The method for primary frequency modulation parameter frequency control of a wind farm according to claim 1, characterized in that the minimum frequency threshold is 49.5Hz and the maximum frequency threshold is 50.5 Hz.
4. The primary frequency modulation parameter frequency control method of a wind farm according to claim 1, characterized by comprising: and constructing a simulation model of the black start of the island power grid system in the simulation model of the power system.
5. The primary frequency modulation parameter frequency control method of the wind power plant according to claim 1, wherein the island grid system comprises M groups of wind power generation sets, a primary frequency modulation control device, a PI integral ratio controller and a load, the primary frequency modulation control device is connected with the wind power generation sets of each group, the primary frequency modulation control device is further connected with the PI integral comparison controller, and an output end of the PI integral comparison controller is connected with the load.
6. A primary frequency modulation parameter frequency control device of a wind power plant is applied to an island power grid system and is characterized by comprising the following components: the system comprises a model building module, a parameter acquisition module, a load acquisition module and a regulation and control module;
the model building module is used for building a simulation model of the black start of the island power grid system;
the parameter acquisition module is used for respectively inputting the simulation model according to n-5% of island power grid system load after the simulation model operates to obtain n primary frequency modulation parameters meeting constraint conditions;
the load acquisition module is used for inputting the n primary frequency modulation parameters into a primary frequency modulation control device of the island power grid system and acquiring the load parameters of the island power grid system in a black start process in real time;
the regulation and control module is used for selecting corresponding primary frequency modulation parameters in the primary frequency modulation control device according to the load parameters acquired in real time to control the operation of the island power grid system;
wherein n is a natural number from 1 to 20, and the constraint condition is that the frequency of the primary frequency modulation parameter is greater than a minimum frequency threshold and less than a maximum frequency threshold.
7. The primary frequency modulation parameter frequency control device of the wind farm according to claim 6, wherein the parameter obtaining module is further configured to adjust the parameter of the PI controller in the simulation model by using an optimization algorithm for the primary frequency modulation value according to the obtained primary frequency modulation value not meeting the constraint condition, and obtain a new primary frequency modulation value again until the obtained new primary frequency modulation value meets the constraint condition, and the new primary frequency modulation value is used as the primary frequency modulation parameter.
8. Primary frequency modulation parameter frequency control of a wind farm according to claim 6, characterized in that the minimum frequency threshold is 49.5Hz and the maximum frequency threshold is 50.5 Hz.
9. The primary frequency modulation parameter frequency control device of a wind farm according to claim 6, wherein the model building module is configured to build a simulation model of black start of an island grid system in a simulation model of a power system.
10. The primary frequency modulation parameter frequency control equipment of the wind power plant is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the method for primary frequency modulation parameter frequency control of a wind farm according to any one of claims 1 to 5 according to instructions in the program code.
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| CN116338365B (en) * | 2023-05-26 | 2023-09-01 | 南方电网数字电网研究院有限公司 | Grid-connected performance testing method suitable for direct current offshore wind turbine generator |
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