CN117638997B - DC frequency controller parameter optimization method considering wind speed fluctuation of wind power plant at transmitting end - Google Patents
DC frequency controller parameter optimization method considering wind speed fluctuation of wind power plant at transmitting end Download PDFInfo
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Abstract
The invention relates to a DC frequency controller parameter optimization method considering wind speed fluctuation of a wind power plant at a transmitting end, which comprises the following steps: the maximum disturbance caused by wind speed fluctuation which can be borne by a power grid at a transmitting end is evaluated, and the maximum disturbance is used as the upper limit of a DC frequency controller in a self area; when the power transmission end power grid suffers from wind speed fluctuation, generating power fluctuation for the power transmission end system by combining a wind power plant, and modifying the power regulation upper limit of a direct current frequency controller of the power transmission end system; after the receiving end system issues a direct current regulation command, the transmitting end system regulates the upper power limit based on the direct current frequency controller, and the maximum disturbance caused by self-bearable wind speed fluctuation is defined and fed back to the receiving end system; the receiving end system realizes the balance of supporting the receiving end and stabilizing the frequency thereof under the condition of the wind speed change of the sending end system by coordinating and optimizing the parameters of the direct current frequency controllers of the sending end system and the receiving end system. Under the condition of fluctuation of wind speed of a power grid at a transmitting end, the method optimizes parameters of a direct current frequency controller at a receiving end and ensures safety and stability of the frequency of a system at the transmitting end.
Description
Technical Field
The invention relates to a DC frequency controller parameter optimization method, device, equipment and medium considering wind speed fluctuation of a wind power plant at a transmitting end, and relates to the field of DC power transmission.
Background
In an AC/DC system, the inertia level of the system is reduced due to the large-scale wind power grid connection of the sending end system. The transmitting end power grid can participate in the frequency adjustment of the receiving end power grid through the connected direct current. However, when the frequency modulation is performed by using direct current, the frequency safety of the transmitting end system can be affected by the high-capacity direct current action and the fluctuation of the wind speed of the wind power plant.
The prior art mainly aims at the active control capability of the fan or the direct current frequency control, namely, the control of the fan and the direct current is improved, the frequency modulation potential of different resources is fully utilized, the frequency characteristic of the system is improved to the maximum extent, but the parameter optimization of the direct current frequency controller (FC, frequency control) is not formulated according to the fluctuation of wind speed.
Therefore, it is necessary to reduce the adjustment amount of the dc frequency controller by parameter optimization in this case, so as to ensure the safety and stability of the frequency of the receiving end power grid when the receiving end power grid is frequency-adjusted by dc.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, in order to solve the above problems, the present invention aims to provide a method, an apparatus, a device, and a medium for optimizing parameters of a direct current frequency controller of a transmitting and receiving end under the condition of fluctuation of wind speed of a transmitting end system, so as to ensure the safety of the frequency of the transmitting end system and consider the fluctuation of wind speed of a transmitting end wind farm.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in a first aspect, the invention provides a method for optimizing parameters of a direct current frequency controller in consideration of wind speed fluctuation of a wind farm at a transmitting end, comprising the following steps:
evaluating the maximum disturbance caused by wind speed fluctuation which can be borne by a power grid at a transmitting end, and taking the maximum disturbance as the upper limit of a DC frequency controller in a self area；
When the power grid of the transmitting end suffers from wind speed fluctuation, the upper limit of a direct current frequency controller of the transmitting end system is modified in real time by combining the power fluctuation condition of the wind power plant on the transmitting end system;
when the receiving end system issues a DC adjustment instructionAfter that, the transmitting end system adjusts the upper power limit based on the direct current frequency controller, and the transmitting end system can clearly determine the self-possibilityMaximum disturbance caused by the fluctuation of the wind speed>And feeds it back to the receiving end system;
the receiving end system is based on the maximum disturbanceAnd modifying the lower limit value of the direct current frequency controller of the self-region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the parameters of the direct current frequency controllers of the sending end system and the receiving end system.
Further, the maximum disturbance caused by wind speed fluctuation which can be borne by the power transmission network is as follows:
；
wherein,for maximum disturbance that the sender system can afford, < ->For the send-end system inertia->For maximum frequency change rate allowed, let maximum disturbance be +>A corresponding upper limit value.
Further, the inertia of the sending end systemThe specific formula of (2) is:
；
wherein,for the inertia of the synchronous machine at the transmitting end->For the capacity of the sender synchronization machine, < > for>Is the capacity of the transmitting end system.
Further, the power fluctuation conditions generated by the wind power plant to the sending end system are as follows:
；
wherein,power variation for wind speed fluctuations of a wind farm, +.>Corresponding to wind speed before change, ++>Corresponding to the wind speed after change, +.>Is a fixed value.
Further, the power regulation upper limit of the power grid direct current frequency controller at the transmitting end is modified in real time:
；
wherein,the upper limit value of the corrected sending end direct current power adjusting instruction is obtained.
Further, the receiver system is based on the maximum disturbanceThe lower limit value of the direct current frequency controller of the self area is modified as follows:
；
in the method, in the process of the invention,is the lower limit value of the direct current power regulation instruction.
Further, the method comprises the steps of,the calculation formula of (2) is as follows:
；
wherein,direct current regulation instruction issued by the receiving end system, < ->Is the maximum disturbance that the sender system can afford.
In a second aspect, the present invention further provides a parameter optimization device for a dc frequency controller, which considers wind speed fluctuation of a wind farm at a transmitting end, including:
the disturbance evaluation unit is configured to evaluate the maximum disturbance caused by wind speed fluctuation which can be borne by the power grid at the transmitting end, and takes the maximum disturbance as the upper limit of the DC frequency controller in the self area；
The power fluctuation unit is configured to modify the upper limit of the direct current frequency controller of the transmitting end system in real time by combining the power fluctuation condition of the wind power plant to the transmitting end system after the transmitting end power grid suffers from wind speed fluctuation;
a feedback unit configured to send out a DC adjustment command when the receiving end systemThen, the power upper limit of the transmitting end system is regulated based on the direct-current frequency controller, and the self-bearable wind speed fluctuation is clearMaximum disturbance by>And feeds it back to the receiving end system;
a coordination optimization unit configured to be based on the maximum disturbance by the receiving end systemAnd modifying the lower limit value of the direct current frequency controller of the self-region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the parameters of the direct current frequency controllers of the sending end system and the receiving end system.
In a third aspect, the present invention provides an electronic device, including: one or more processors, memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods.
In a fourth aspect, a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a computing device, cause the computing device to perform any of the methods.
The invention adopts the technical proposal and has the following characteristics: according to the invention, firstly, the running characteristics of the units in the wind power plant are considered, the power fluctuation caused by the wind speed fluctuation of the wind power plant at the transmitting end is definitely considered, on the basis, the maximum disturbance bearable by the transmitting end system is estimated by combining the action mechanism of the DC frequency limiting controller, and the interactive coordination control method of the transmitting end system is further formulated, so that the parameters of the DC frequency controller at the transmitting end can be optimized under the condition of the wind speed fluctuation of the transmitting end system, and the frequency safety of the transmitting end system is ensured. In conclusion, the invention can be widely applied to the field of direct current transmission, and is not limited by a specific direct current transmission technology.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like parts are designated with like reference numerals throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a dc frequency controller according to an embodiment of the invention.
FIG. 2 is a control optimization flow chart of an embodiment of the present invention.
Fig. 3 is a wiring diagram of two regional power grids including dc power transmission according to an embodiment of the present invention.
Fig. 4 is a frequency characteristic diagram of a transmitting end system according to an embodiment of the present invention.
Fig. 5 is a frequency characteristic diagram of a receiving end system according to an embodiment of the present invention.
Fig. 6 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For ease of description, spatially relative terms, such as "inner," "outer," "lower," "upper," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
Aiming at the frequency safety problem of the transmitting end power grid under the condition that the wind speed of the wind power plant of the transmitting end power grid fluctuates and the transmitting end power grid participates in the frequency modulation of the receiving end power grid through direct current. The invention provides a DC frequency controller parameter optimization method, a device, equipment and a medium considering wind speed fluctuation of a wind power plant at a transmitting end, comprising the following steps: evaluating the maximum disturbance caused by wind speed fluctuation which can be borne by a power grid at a transmitting end, and taking the maximum disturbance as the upper limit of a DC frequency controller in a self areaThe method comprises the steps of carrying out a first treatment on the surface of the When the power grid of the transmitting end suffers from wind speed fluctuation, the upper limit of a direct current frequency controller of the transmitting end system is modified in real time by combining the power fluctuation condition of the wind power plant on the transmitting end system; when the receiving end system issues a DC adjustment instruction +.>After that, the transmitting end system adjusts the upper power limit based on the direct current frequency controller, and determines the maximum disturbance caused by self-bearable wind speed fluctuation +.>And feeds it back to the receiving end system; the receiving end system is based on the maximum disturbanceAnd modifying the lower limit value of the direct current frequency controller of the self-region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the parameters of the direct current frequency controllers of the sending end system and the receiving end system. Therefore, the invention can optimize the parameters of the direct current frequency controller of the transmitting and receiving end under the condition of fluctuation of the wind speed of the power grid of the transmitting end, and ensure the safety and stability of the frequency of the system of the transmitting end.
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, power fluctuation caused by wind speed fluctuation of a power grid in a power transmission area is clarified by considering the running characteristics of units in the wind power plant. The physical characteristics of a wind turbine to capture wind energy and convert mechanical energy into electrical power can generally be described by equation (1).
；
In the method, in the process of the invention,for the mechanical power of the fan, < > for>For air density->For the radius of the fan blade>For the wind speed of the wind,for the wind energy utilization coefficient of the fan, < > for>For tip speed ratio->Is the pitch angle of the fan.
The dynamic process of the fan rotor shafting can be represented by a formula (2):
；
in the method, in the process of the invention,and->Mechanical power and electromagnetic power of the fan respectively, < ->Is inertial time constant, +.>Is the generator speed.
The wind energy utilization efficiency of the wind turbine is usually optimal when the wind turbine is in a maximum power tracking working state, and the captured wind energy power can be expressed by the following formula:
；
wherein,for maximum wind energy utilization efficiency, the speed ratio of the wind energy generator to the optimal blade tip speed ratio is +.>In correspondence with the fact that,is a fixed value.
When the wind speed of the wind power plant changes, the power fluctuation generated by the wind power plant on the transmitting end system is shown as an equation (4). At this time, the synchronous machine of the sending end system not only needs to maintain the direct current regulation power of the receiving end system, but also resists the disturbance caused by the fluctuation of the wind speed in the area.
；
Wherein,power variation for wind speed fluctuations of a wind farm, +.>Corresponding to wind speed before change, ++>Corresponding to the changed wind speed.
Considering power fluctuation caused by wind speed fluctuation, and evaluating the maximum disturbance bearable by a transmitting end system by combining the action mechanism of a direct current frequency controller, wherein the adjusting instruction of the direct current frequency controller is as follows:
；
in the method, in the process of the invention,for systematic frequency deviation, +.>Is a low-pass filter time constant, +.>The gain factor is the proportional gain factor of the DC frequency controller; />Is the inertia time constant of the DC frequency controller, < +.> ，/>Upper and lower limit values for the power regulation command of the DC frequency controller, < >>Is a direct current active power adjustment instruction.
When the AC system has frequency deviation due to active unbalance, the DC frequency control can be based onAnd generating a direct current active power adjustment instruction, superposing the direct current active power adjustment instruction into an active power reference value, realizing the change of direct current power, completing the preset target of direct current control, and finally relieving the power imbalance in the system. And taking the transmission power from the power transmission network to the power receiving network as the positive direction, inputting the direct current power regulation and the wind speed change as disturbance to the power transmission system, and combining the frequency change rate safety constraint of the power transmission system, wherein the maximum disturbance caused by the wind speed fluctuation can be borne by the area, as shown in equations (6) - (8).
；
Wherein,for maximum disturbance that the sender system can afford, < ->For the send-end system inertia->For maximum frequency change rate allowed, let maximum disturbance be +>A corresponding upper limit value.
；
Wherein,for the inertia of the synchronous machine at the transmitting end->For the capacity of the sender synchronization machine, < > for>Is the capacity of the transmitting end system.
；
Wherein,maximum wind speed fluctuation of wind farm which can be borne by the terminal sending system, < > for>The direct current regulation command is issued by the receiving end system.
In the case of the transmitter system participating in frequency modulation by DC, it is considered that if the wind speed fluctuation in equation (4) exceedsThen the end-of-line grid will be at risk of new energy coming off-grid. In order to avoid the phenomenon of frequency instability of the transmitting end system, the upper limit value of the power regulation instruction of the direct current frequency controller of the transmitting end system can be optimized through coordination of the transmitting end system and the receiving end system.
Embodiment one: based on the above principle, as shown in fig. 2, the method for optimizing parameters of the dc frequency controller in consideration of wind speed fluctuation of the wind farm at the transmitting end provided in this embodiment includes:
s1, based on equation (6) and equation (7) combined with inertia of a power transmission end system, evaluating maximum disturbance caused by wind speed fluctuation which can be borne by a power transmission end power grid, and taking the maximum disturbance as the upper limit of power regulation of a DC frequency controller in a self area。
S2, after wind speed fluctuates, based on the equation (4) and the power fluctuation condition of the wind power plant on the power transmission end system, the power regulation upper limit of the power transmission end power grid direct current frequency controller is modified in real time, and the power regulation upper limit is shown as an equation (9):
；
wherein,the upper limit value of the corrected sending end direct current power adjusting instruction is obtained.
S3, after the upper limit of the direct current frequency controller in the self area is determined, when the receiving end system issues a direct current regulating instructionAfter that, the transmitting end system can be combined with equation (8) to determine the maximum disturbance caused by self-sustainable wind speed fluctuation>And feeds it back to the receiving end system.
S4, combining feedback by the receiving end systemThe lower limit value of the power adjustment of the direct current frequency controller in the self area is modified as shown in an equation (10), namely, the direct current controller parameters of the sending end system and the receiving end system are coordinated and optimized, so that the frequency change of the receiving end system is not influenced by the change of the wind speed of the sending end, the influence of the wind speed fluctuation of the sending end wind farm is considered, and more direct current power support requirements are met for the sending end system under the condition that the frequency change of the receiving end system is large.
。
The effectiveness and the correctness of the direct current frequency controller parameter optimization method considering wind speed fluctuation of the wind power plant at the transmitting end are described by a specific embodiment.
As shown in fig. 3, two-region wiring diagram verification with direct current transmission is performed, and the following several examples are set for comparison. The power transmission system is composed of a 900MW synchronous generator and a 1000MW wind farm, and the power grid of the receiving end is composed of two 900MW synchronous generators. The initial wind speed of the wind power plant of the end-feeding system is 8.5m/s. Setting the load sudden increase disturbance with the disturbance magnitude of 200MW at the moment of 1s of the receiving end system, and starting the frequency controllers at the two sides of the direct current receiving end.
Fig. 4 shows the frequency characteristics of the system of the transmitting end system under different working conditions, the transmitting end power grid does not participate in the frequency modulation of the receiving end power grid, and the frequency of the transmitting end system does not change greatly because the two systems are separated by direct current transmission, when the transmitting end system participates in the frequency adjustment of the receiving end system, the frequency of the transmitting end system is reduced, the frequency of the transmitting end system is further reduced due to the reduction of wind speed, and the frequency characteristics of the system are deteriorated. By adopting the method, the frequency change rate can be limited in a safe range. Fig. 5 shows the frequency variation characteristic of the receiving end system, the frequency of the receiving end system can be effectively improved by the direct current participation frequency modulation of the sending end, and the frequency variation of the receiving end system can not be influenced by the variation of the wind speed of the sending end, but the upper limit of the direct current regulating power which can be born by the sending end system can be influenced, so that the parameters of the direct current frequency controller of the sending end are necessary to be coordinated and optimized.
Embodiment two: the first embodiment provides a method for optimizing parameters of a dc frequency controller in consideration of wind speed fluctuation of a wind farm at a transmitting end, and correspondingly, the embodiment provides a device for optimizing parameters of a dc frequency controller in consideration of wind speed fluctuation of a wind farm at a transmitting end. The device provided by the embodiment can implement the direct current frequency controller parameter optimization method considering wind speed fluctuation of the wind power plant at the transmitting end, and the device can be realized in a mode of software, hardware or combination of software and hardware. For convenience of description, the present embodiment is described while being functionally divided into various units. Of course, the functions of the units may be implemented in the same piece or pieces of software and/or hardware. For example, the apparatus may comprise integrated or separate functional modules or functional units to perform the corresponding steps in the methods of the first embodiment. Because the device of the embodiment is basically similar to the method embodiment, the description process of the embodiment is simpler, and the relevant points can be seen from the part of the description of the first embodiment.
In a second aspect, the invention provides a parameter optimization device for a direct current frequency controller considering wind speed fluctuation of a wind farm at a transmitting end, comprising:
the disturbance evaluation unit is configured to evaluate the maximum disturbance caused by wind speed fluctuation which can be borne by the power grid at the transmitting end, and takes the maximum disturbance as the power regulation upper limit of the DC frequency controller in the self area；
The power fluctuation unit is configured to modify the power regulation upper limit of the direct current frequency controller of the transmitting end system in real time by combining the power fluctuation condition of the wind power plant to the transmitting end system after the transmitting end power grid suffers from wind speed fluctuation;
a feedback unit configured to send out a DC adjustment command when the receiving end systemThen, the transmitting end system determines the maximum disturbance caused by self-bearable wind speed fluctuation based on the power regulation upper limit of the direct current frequency controller>And feeds it back to the receiving end system;
a coordination optimization unit configured to be based on the maximum disturbance by the receiving end systemAnd modifying the power regulation lower limit value of the direct current frequency controller in the self region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the direct current frequency controller parameters of the sending end system and the receiving end system.
Embodiment III: the present embodiment provides an electronic device corresponding to the method for optimizing parameters of a dc frequency controller that takes into account wind speed fluctuation of a wind farm at a transmitting end provided in the first embodiment, where the electronic device may be an electronic device for a client, for example, a mobile phone, a notebook computer, a tablet computer, a desktop computer, etc., so as to execute the method in the first embodiment.
As shown in fig. 6, the electronic device includes a processor, a memory, a communication interface, and a bus, where the processor, the memory, and the communication interface are connected by the bus to complete communication with each other. The bus may be an industry standard architecture (ISA, industry Standard Architecture) bus, a peripheral component interconnect (PCI, peripheral Component) bus, or an extended industry standard architecture (EISA, extended Industry Standard Component) bus, among others. The memory stores a computer program that can be executed on the processor, and when the processor executes the computer program, the processor executes the method of the first embodiment, so that the principle and technical effects are similar to those of the first embodiment, and are not described herein again. Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the architectures associated with the present application and does not constitute a limitation of the computing devices to which the present application may be applied, and that a particular computing device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In a preferred embodiment, the logic instructions in the memory described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an optical disk, or other various media capable of storing program codes.
In a preferred embodiment, the processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or other general purpose processor, which is not limited herein.
Embodiment four: the present embodiment provides a computer program product, which may be a computer program stored on a computer readable storage medium, where the computer program includes program instructions, and when the program instructions are executed by a computer, the computer is capable of executing the method provided in the above embodiment, and its implementation principles and technical effects are similar to those of the embodiment and are not repeated herein.
In a preferred embodiment, the computer-readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device, such as, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the foregoing. The computer-readable storage medium stores computer program instructions that cause a computer to perform the method provided by the first embodiment described above.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In the description of the present specification, reference to the terms "one preferred embodiment," "further," "specifically," "in the present embodiment," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A DC frequency controller parameter optimization method considering wind speed fluctuation of a wind power plant at a transmitting end is characterized by comprising the following steps:
the maximum disturbance caused by wind speed fluctuation which can be borne by a power grid at a transmitting end is estimated, and the maximum disturbance is used as the upper limit of power regulation of a DC frequency controller in a self areaThe method comprises the following steps of:
；
wherein,for maximum disturbance that the sender system can afford, < ->For the send-end system inertia->For maximum frequency change rate allowed, let maximum disturbance be +>A corresponding upper limit value;
when the power transmission end power grid suffers from wind speed fluctuation, combining the power fluctuation condition of the wind power plant to the power transmission end system, and real-time modifying the power regulation upper limit of the direct current frequency controller of the power transmission end system, wherein the real-time modifying the power regulation upper limit of the direct current frequency controller of the power transmission end power grid:
；
wherein,for the upper limit value of the corrected supply-side DC power regulation command, < >>Power variation generated for wind speed fluctuation of a wind farm;
when the receiving end system issues a DC adjustment instructionThen, the transmitting end system determines the maximum disturbance caused by self-bearable wind speed fluctuation based on the power regulation upper limit of the direct current frequency controller>And feeds it back to the receiving end system;
the receiving end system is based on the maximum disturbanceModifying the power regulation lower limit value of the direct current frequency controller of the self region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the direct current frequency controller parameters of the sending end system and the receiving end system, wherein the receiving end system is based on the maximum disturbance ∈>The power regulation lower limit value of the direct current frequency controller in the self area is modified as follows:
；
in the method, in the process of the invention,the power regulation lower limit is regulated for the direct current power.
2. The wind farm with consider delivery end according to claim 1The DC frequency controller parameter optimization method of wind speed fluctuation is characterized in that the inertia of a transmitting end systemThe specific formula of (2) is:
；
wherein,for the inertia of the synchronous machine at the transmitting end->For the capacity of the sender synchronization machine, < > for>Is the capacity of the transmitting end system.
3. The method for optimizing parameters of a direct current frequency controller considering wind speed fluctuation of a wind power plant at a transmitting end according to claim 1, wherein the power fluctuation condition of the wind power plant to the wind power plant at the transmitting end is:
；
wherein,power variation for wind speed fluctuations of a wind farm, +.>Corresponding to wind speed before change, ++>Corresponding to the wind speed after change, +.>Is a fixed value.
4. The method for optimizing parameters of a direct current frequency controller taking into consideration wind speed fluctuation of a wind farm at a transmitting end according to claim 1, wherein,the calculation formula of (2) is as follows:
；
wherein,direct current regulation instruction issued by the receiving end system, < ->Is the maximum disturbance that the sender system can afford.
5. The utility model provides a take into account direct current frequency controller parameter optimization device of sending end wind farm wind speed fluctuation which characterized in that includes:
the disturbance evaluation unit is configured to evaluate the maximum disturbance caused by wind speed fluctuation which can be borne by the power grid at the transmitting end, and takes the maximum disturbance as the power regulation upper limit of the DC frequency controller in the self areaThe method comprises the following steps of:
；
wherein,for maximum disturbance that the sender system can afford, < ->For the send-end system inertia->For maximum frequency change rate allowed, let maximum disturbance be +>A corresponding upper limit value;
the power fluctuation unit is configured to modify the power regulation upper limit of the direct current frequency controller of the transmitting end system in real time in combination with the power fluctuation condition of the wind power plant on the transmitting end system after the transmitting end power grid suffers from wind speed fluctuation, wherein the power regulation upper limit of the direct current frequency controller of the transmitting end power grid is modified in real time:
；
wherein,for the upper limit value of the corrected supply-side DC power regulation command, < >>Power variation generated for wind speed fluctuation of a wind farm;
a feedback unit configured to send out a DC adjustment command when the receiving end systemThen, the transmitting end system determines the maximum disturbance caused by self-bearable wind speed fluctuation based on the power regulation upper limit of the direct current frequency controller>And feeds it back to the receiving end system;
a coordination optimization unit configured to be based on the maximum disturbance by the receiving end systemModifying the power regulation lower limit value of the direct current frequency controller of the self region, namely realizing the balance of supporting the receiving end and stabilizing the self frequency under the condition of changing the wind speed of the sending end system by coordinating and optimizing the direct current frequency controller parameters of the sending end system and the receiving end system, wherein the receiving end system is based on the maximum disturbance ∈>The power regulation lower limit value of the direct current frequency controller in the self area is modified as follows:
；
in the method, in the process of the invention,the power regulation lower limit is regulated for the direct current power.
6. An electronic device, comprising: one or more processors, memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising instructions for performing any of the methods of claims 1-4.
7. A computer readable storage medium storing one or more programs, wherein the one or more programs comprise instructions, which when executed by a computing device, cause the computing device to perform any of the methods of claims 1-4.
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