CN112989581A - Frequency dynamic simulation method and device, electronic equipment and storage medium - Google Patents
Frequency dynamic simulation method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The invention provides a frequency dynamic simulation method, a frequency dynamic simulation device, electronic equipment and a storage medium, wherein the method comprises the following steps: acquiring power load node frequency deviation simulation information; inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node; the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid. By constructing a target load simulation model, the frequency deviation simulation information of the power load node is input into the model, and the active power deviation information of the power load node is output, so that the load simulation model suitable for frequency dynamic simulation can be accurately obtained, an important model foundation is provided for power grid frequency dynamic analysis and operation control, and the reliable operation of a power grid is effectively ensured.
Description
Technical Field
The present invention relates to the field of power system analysis, and in particular, to a method and an apparatus for frequency dynamic simulation, an electronic device, and a storage medium.
Background
With the continuous increase of the occupation ratio of new energy such as wind power, photovoltaic and the like in a power system, the frequency safety problem of the system is obvious, and the frequency deviation under power disturbance becomes large. The frequency dynamic process of the accurate simulation system under the power disturbance has important significance for guaranteeing the frequency safety of the system.
The load model has an important influence on the system frequency dynamic process. In the frequency dynamic simulation, the load active power change caused by the frequency change is mainly concerned. The traditional static load model considering the load frequency regulation effect coefficient is too simple and does not consider the load dynamic; dynamic load models such as asynchronous motors are too complex, the key point of active power change caused by frequency change is not caught, and the parameters are numerous, so that the model parameters are not favorably identified based on measured data.
Therefore, how to better perform frequency dynamic simulation of the power system has become a problem to be solved by the industry.
Disclosure of Invention
The invention provides a frequency dynamic simulation method, a frequency dynamic simulation device, electronic equipment and a storage medium, which are used for solving the problem that the frequency dynamic simulation of a power system cannot be well performed in the prior art.
The invention provides a frequency dynamic simulation method, which comprises the following steps:
acquiring power load node frequency deviation simulation information;
inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node;
the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
According to the frequency dynamic simulation method provided by the invention, the target load simulation model specifically comprises the following steps:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
According to the frequency dynamic simulation method provided by the invention, before the step of inputting the power load node frequency deviation simulation information into the target load simulation model, the method further comprises the following steps:
acquiring a dynamic measurement curve of the frequency of a power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve delta f according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid, a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power gridm(ti) Active power deviation curve of power load node
Constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
According to the dynamic frequency simulation method provided by the invention, the step of constructing the minimization optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve specifically comprises the following steps:
the decision variable of the minimization optimization target model is a parameter (K) of a load modelL1,KL2,TL) The optimization target is sigmai(ΔPL s(ti)-ΔPL m(ti))2Minimum;
wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And the simulation output is the active power deviation of the power load node of the input load model.
The invention also provides a frequency dynamic simulation device, comprising:
the acquisition module is used for acquiring power load node frequency deviation simulation information;
the simulation module is used for inputting the power load node frequency deviation simulation information into a target load simulation model to obtain the power load node active power deviation information;
the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
The target load simulation model specifically comprises the following steps:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
The device further comprises: a modeling module;
the modeling module is used for acquiring a dynamic measurement curve of the frequency of the power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve and a power load node active power deviation curve according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid and a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power grid;
constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
The modeling module is further specifically configured to:
the decision variable of the minimization optimization target model is a parameter (K) of a load modelL1,KL2,TL) The optimization target is sigmai(ΔPL s(ti)-ΔPL m(ti))2Minimum;
wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And the simulation output is the active power deviation of the power load node of the input load model.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the frequency dynamic simulation method.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for frequency dynamic simulation as described in any of the above.
According to the frequency dynamic simulation method, the frequency dynamic simulation device, the electronic equipment and the storage medium, the target load simulation model is constructed, the model input is the frequency deviation simulation information of the power load node, and the model output is the active power deviation information of the power load node, so that the load simulation model suitable for frequency dynamic simulation can be accurately obtained, an important model basis is provided for power grid frequency dynamic analysis and operation control, and reliable operation of a power grid is effectively guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for 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 some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a frequency dynamic simulation method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a frequency dynamic simulation apparatus according to the present invention;
fig. 3 is a schematic physical structure diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
Fig. 1 is a schematic flow chart of a frequency dynamic simulation method according to an embodiment of the present invention, as shown in fig. 1, including:
step S1, acquiring frequency deviation simulation information of the power load node;
specifically, the power load node frequency deviation simulation information described in the embodiment of the present invention may be set according to a requirement.
And the frequency deviation simulation information is used for fully considering the factors of the active power change caused by the frequency change in the simulation process.
Step S2, inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain the active power deviation information of the power load node;
the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
Specifically, a frequency response model of the load to be analyzed is constructed, the transfer function of the model is shown as the following formula, the input is power load node frequency deviation simulation information delta f, and the output is power load node active power deviation information delta PLThe transfer function is
There are 3 model parameters: kL1、KL2、TL。
The load model comprises the static frequency regulation effect of the load and the power response of the load of the asynchronous motor when the frequency changes, and is simple in structure, less in undetermined parameter and suitable for frequency dynamic simulation.
According to the embodiment of the invention, the target load simulation model is constructed, the frequency deviation simulation information of the power load node is input into the model, and the active power deviation information of the power load node is output, so that the load simulation model suitable for frequency dynamic simulation can be accurately obtained, and an important model foundation is provided for power grid frequency dynamic analysis and operation control, thereby effectively ensuring the reliable operation of a power grid.
Based on any of the above embodiments, the target load simulation model specifically includes:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
Prior to the step of inputting the power load node frequency deviation simulation information into a target load simulation model, the method further comprises:
acquiring a dynamic measurement curve of the frequency of a power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve and a power load node active power deviation curve according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid and a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power grid;
constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
Specifically, a dynamic measurement curve of the frequency of the power load node after power disturbance of the power grid and a dynamic measurement curve of the active power of the power load node are obtained, and initial values before disturbance are subtracted respectively to obtain a frequency deviation curve delta f of the power load nodem(ti) Active power deviation curve of power load node
The dynamic measurement of the active power of a frequency is generally derived from a phasor measurement unit PMU, which obtains a series of discrete time points tiThe measured value of (c). The measurement curve is taken from the sampling point before the disturbance occurs, the data length is generally 30s to 60s, and the whole primary frequency modulation process is included. The initial value before disturbance is the value of the sampling point before the disturbance occurs.
According to the frequency deviation curve delta f of the power load nodem(ti) Active power deviation curve of power load node
Identifying parameters of the load model by constructing a minimized optimization target model and determining the parameters (K) of the load model as decision variablesL1,KL2,TL) With the optimization objective of
Minimum, wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And (3) performing active power deviation simulation output on the power load node of the input load model, and solving the optimization model to obtain an optimal decision variable, namely a parameter of the final load model.
The optimization model may generally include some constraints, such as parameter value ranges. There are many algorithms for solving the optimization model, and the algorithms are not particularly limited, and a particle swarm algorithm can be preferably used.
The calculation process of the minimization algorithm in the embodiment of the invention can be realized by the existing calculation program, and is not the key point of the protection of the invention.
Fig. 2 is a schematic diagram of a frequency dynamic simulation apparatus provided by the present invention, as shown in fig. 2, including: an acquisition module 210 and a simulation module 220; the obtaining module 210 is configured to obtain power load node frequency deviation simulation information; the simulation module 220 is configured to input the power load node frequency deviation simulation information into a target load simulation model to obtain power load node active power deviation information; the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
The target load simulation model specifically comprises the following steps:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
The device further comprises: a modeling module;
the modeling module is used for acquiring a dynamic measurement curve of the frequency of the power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve and a power load node active power deviation curve according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid and a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power grid;
constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
The modeling module is further specifically configured to:
the decision variable of the minimization optimization target model is a parameter (K) of a load modelL1,KL2,TL) The optimization target is sigmai(ΔPL s(ti)-ΔPL m(ti))2Minimum;
wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And simulating and outputting the active power of the power load node of the load model at the time of input.
According to the embodiment of the invention, the target load simulation model is constructed, the frequency deviation simulation information of the power load node is input into the model, and the active power deviation information of the power load node is output, so that the load simulation model suitable for frequency dynamic simulation can be accurately obtained, and an important model foundation is provided for power grid frequency dynamic analysis and operation control, thereby effectively ensuring the reliable operation of a power grid.
Fig. 3 is a schematic physical structure diagram of an electronic device provided in the present invention, and as shown in fig. 3, the electronic device may include: a processor (processor)310, a communication Interface (communication Interface)320, a memory (memory)330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. The processor 310 may call logic instructions in the memory 330 to perform a frequency dynamic simulation method comprising: acquiring power load node frequency deviation simulation information; inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node; the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. 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.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the frequency dynamics simulation method provided by the above methods, the method comprising: acquiring power load node frequency deviation simulation information; inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node; the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the frequency dynamic simulation method provided by the above embodiments, the method including: acquiring power load node frequency deviation simulation information; inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node; the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
The above-described embodiments of the apparatus are merely illustrative, and 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 method for dynamic frequency simulation, comprising:
acquiring power load node frequency deviation simulation information;
inputting the frequency deviation simulation information of the power load node into a target load simulation model to obtain active power deviation information of the power load node;
the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
2. The frequency dynamic simulation method according to claim 1, wherein the target load simulation model is specifically:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
3. The frequency dynamics simulation method of claim 2, wherein prior to the step of inputting the power load node frequency deviation simulation information into a target load simulation model, the method further comprises:
acquiring a dynamic measurement curve of the frequency of a power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve delta f according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid, a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power gridm(ti) And the active power of the power load node is biasedDifference curve
Constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
4. The dynamic frequency simulation method according to claim 3, wherein the step of constructing a minimization optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve specifically comprises:
the decision variable of the minimization optimization target model is a parameter (K) of a load modelL1,KL2,TL) The optimization target is sigmai(ΔPL s(ti)-ΔPL m(ti))2Minimum;
wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And the simulation output is the active power deviation of the power load node of the input load model.
5. A frequency dynamics simulation apparatus, comprising:
the acquisition module is used for acquiring power load node frequency deviation simulation information;
the simulation module is used for inputting the power load node frequency deviation simulation information into a target load simulation model to obtain the power load node active power deviation information;
the target load simulation model is constructed according to a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance occurs to a power grid.
6. The frequency dynamics simulation apparatus of claim 5, wherein the target load simulation model is specifically:
wherein, KL1,KL2And TLAre parameters of a target load simulation model, delta f is power load node frequency deviation simulation information, delta PLAnd the active power deviation information of the power load node is obtained.
7. The frequency dynamics simulation apparatus of claim 6, further comprising: a modeling module;
the modeling module is used for acquiring a dynamic measurement curve of the frequency of the power load node and a dynamic measurement curve of the active power of the power load node after power disturbance of a power grid;
obtaining a power load node frequency deviation curve and a power load node active power deviation curve according to a power load node frequency initial value and a power load node active power initial value before power disturbance of a power grid and a power load node frequency dynamic measurement curve and a power load node active power dynamic measurement curve after power disturbance of the power grid;
constructing a minimum optimization target model according to the power load node frequency deviation curve and the power load node active power deviation curve;
and solving the minimized and optimized target model to obtain the parameters of the target load simulation model.
8. The frequency dynamics simulation apparatus of claim 7, wherein the modeling module is further configured to:
the decision variable of the minimization optimization target model is a parameter (K) of a load modelL1,KL2,TL) The optimization target is sigmai(ΔPL s(ti)-ΔPL m(ti))2Minimum;
wherein Δ PL s(ti) To obtain a power load node frequency deviation curve delta fm(ti) And the simulation output is the active power deviation of the power load node of the input load model.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the frequency dynamics simulation method according to any one of claims 1 to 4 when executing the program.
10. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the frequency dynamics simulation method according to any one of claims 1 to 4.
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Application publication date: 20210618 |