CN113497462A - Reactive voltage control method and system for rapidly restraining transient voltage - Google Patents
Reactive voltage control method and system for rapidly restraining transient voltage Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
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- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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Abstract
The invention provides a reactive voltage control method and a system for quickly suppressing transient voltage, wherein the method comprises the following steps: the AVC of the wind power plant calculates the reactive power to be regulated by the wind power plant according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, calculates the voltage value of the main transformer low-voltage side of the reactive power compensation device according to the main transformer voltage parameter of the wind power plant, and generates a voltage instruction and sends the voltage instruction to the reactive power compensation device; the reactive compensation device performs reactive adjustment according to the voltage instruction, performs tracking control on the voltage of a grid connection point, and performs adjustment suppression when transient voltage occurs; the method and the system can ensure that the wind power plant has the tracking and adjusting capability in a steady state, and can also perform quick tracking and adjusting when the system voltage has transient fluctuation, so as to stabilize the voltage of the power grid.
Description
Technical Field
The invention relates to the field of power control, in particular to a reactive voltage control method and system for quickly suppressing transient voltage.
Background
With the gradual depletion of fossil energy and the increasing pressure of environmental protection, people are increasingly keen on the desire for clean and sustainable energy. Wind power is in a priority position in the development of clean energy due to the advantages of mature technology and abundant resources. With the leap-type development of wind power, the contradiction between the explosive growth of the installed scale of the wind power and the safety and stability of the voltage of a power grid is increasingly prominent.
In order to solve the Voltage safety problem of large-scale wind power access, each wind power station is simultaneously provided with a reactive Voltage Control system (AVC) and a dynamic reactive power compensation device (SVG) for improving and coordinating the stability of Voltage. In order to ensure the voltage stability of the grid-connected point of the wind power plant, the AVC system of the wind power plant realizes the voltage stable operation of the grid-connected point by adjusting the reactive power of a reactive power compensation device and a wind power generator set in the station. Wind power plants generally run at the tail end of a power grid, and grid systems are relatively weak, voltage fluctuation amplitude is large, and voltage stability is relatively poor. In addition, the wind power plant AVC system carries out reactive power regulation and control through a periodic instruction, when the voltage of the system fluctuates in an AVC regulation period, the AVC system cannot carry out regulation in time, and reactive regulation and instruction issuing are carried out when the voltage of the system needs to wait for the next control period. The control strategy can realize stable operation of the grid-connected point voltage in a steady state, but the voltage cannot be quickly tracked and adjusted when the system fluctuates.
In summary, a technical scheme is needed to ensure fast regulation and control of a wind power plant in a steady state and realize fast tracking regulation when transient fluctuation occurs in a system voltage.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a reactive voltage control method and a system for quickly suppressing transient voltage, wherein the method and the system issue a required reactive instruction to a wind turbine generator set by AVC of a wind power plant during steady-state control, and simultaneously calculate a voltage instruction (taking the voltage at the low-voltage side of a main transformer as a control target) to be adjusted by a reactive compensation device and issue the voltage instruction to the reactive compensation device, the reactive compensation device quickly realizes reactive power tracking control according to the voltage instruction, then realizes reactive replacement through the reactive power tracking adjustment of the wind turbine generator set, and when the voltage fluctuation occurs in the system, the reactive compensation device can quickly suppress the voltage fluctuation in a constant voltage control mode to play a role in stabilizing the voltage of a power grid. The method not only ensures the quick adjustment control of the wind power plant in a steady state, but also can realize the quick tracking adjustment when the system voltage has transient fluctuation.
In a first aspect of the embodiments of the present invention, a reactive voltage control method for fast suppressing a transient voltage is provided, where the method includes:
the AVC of the wind power plant calculates the reactive power to be regulated by the wind power plant according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, calculates the voltage value of the main transformer low-voltage side of the reactive power compensation device according to the main transformer voltage parameter of the wind power plant, and generates a voltage instruction and sends the voltage instruction to the reactive power compensation device;
the reactive power compensation device performs reactive power regulation according to the voltage instruction, performs tracking control on the voltage of a grid connection point, and performs regulation and suppression when transient voltage occurs;
the wind turbine generator system carries out reactive power regulation according to a reactive power instruction issued by the wind power plant AVC, reactive power replacement of the reactive power compensation device is carried out in the reactive power regulation process of the wind turbine generator system, and the reactive power compensation device is kept to have certain reactive power margin.
Further, the method further comprises:
after the AVC of the wind power plant receives the target voltage instruction value, calculating to obtain a reactive voltage sensitivity coefficient of the wind power plant, wherein the calculation formula of the reactive voltage sensitivity coefficient is as follows:
wherein, X1、X2Is a process variable, U1For the last time point of grid-connected point voltage measurement, Q1For the last moment of the grid-connected point reactive power measurement, U2For the current moment of the grid-connected point voltage measurement, Q2And Z is a reactive power measurement value of a grid connection point at the current moment and is a reactive voltage sensitivity coefficient.
Further, the reactive voltage sensitivity coefficient of the wind power plant is calculated periodically and circularly, and the average value of data in four hours is selected as the current reactive voltage sensitivity coefficient.
Further, the wind farm AVC calculates, according to the received target voltage instruction, to obtain the reactive power to be adjusted by the wind farm, generates a reactive power instruction, and issues the reactive power instruction to the wind turbine generator, and includes:
the calculation formula of the reactive power to be regulated by the wind power plant is as follows:
Qref＝(Uafter-Ubefor)×Z；
wherein, UafterTarget voltage command value, U, received for wind farm AVCberefIs the current voltage value, Q, of the wind farmrefAnd transmitting the reactive power to the wind turbine generator set for the calculated reactive power to be adjusted of the wind power plant.
Further, the wind farm AVC calculates a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind farm, generates a voltage command and issues the voltage command to the reactive compensation device, and the method comprises the following steps:
calculating to obtain a voltage instruction value of a main transformer low-voltage side of the reactive compensation device according to the reactive voltage sensitivity coefficient of the wind power plant, and issuing a generated voltage instruction to the reactive compensation device for tracking control of a voltage target instruction; wherein, the calculation formula of the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is as follows:
Uref＝(Uafter×(1-1/Z))/R；
wherein, UafterA target voltage command value received by AVC of the wind power plant, Z is a reactive voltage sensitivity coefficient, R is a voltage transformation ratio of a high-voltage side and a low-voltage side of a main transformer of the wind power plant, and UrefAnd the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is obtained.
Further, the method further comprises:
setting control parameters of a voltage control mode of the reactive power compensation device; adjusting the voltage slope coefficient of the reactive power compensation device according to the current reactive voltage sensitivity coefficient, and setting the voltage slope coefficient of the reactive power compensation device to be 0.1% -1% when the sensitivity coefficient is less than 10; and when the sensitivity coefficient is larger than 10, setting the voltage slope coefficient of the reactive power compensation device to be 1% -10%.
Furthermore, the main transformer low-voltage side of the wind power plant at least comprises two sets of reactive compensation devices; one set of reactive compensation device is set to be in a main transformer low-voltage side constant voltage control mode and used for receiving a voltage instruction issued by the wind power plant AVC, and the other reactive compensation devices are set to be in a reactive control mode and used for receiving a reactive power instruction issued by the wind power plant AVC.
In a second aspect of the embodiments of the present invention, a reactive voltage control system for fast suppressing a transient voltage is provided, the system including: wind power plant AVC, reactive power compensation device and wind turbine generator; wherein the content of the first and second substances,
the wind power plant AVC is used for calculating reactive power to be regulated by the wind power plant according to the received target voltage instruction, generating a reactive power instruction and issuing the reactive power instruction to the wind turbine generator, calculating a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind power plant, and generating a voltage instruction and issuing the voltage instruction to the reactive compensation device;
the reactive power compensation device is used for performing reactive power regulation according to the voltage instruction, performing tracking control on the voltage of a grid connection point, and performing regulation and suppression when transient voltage occurs;
the wind turbine generator is used for carrying out reactive power regulation according to a reactive instruction issued by the wind power station AVC, carrying out reactive power replacement on the reactive power compensation device in the reactive power regulation process of the wind turbine generator, and keeping the reactive power compensation device to have certain reactive power margin.
In a third aspect of embodiments of the present invention, a computer device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the processor implements a reactive voltage control method for fast suppressing a transient voltage.
In a fourth aspect of embodiments of the present invention, a computer-readable storage medium is presented, which stores a computer program that, when executed by a processor, implements a reactive voltage control method for fast suppression of transient voltages.
According to the reactive voltage control method and the system for quickly suppressing the transient voltage, the reactive power to be regulated by the wind power plant is calculated and obtained by the wind power plant AVC according to the received target voltage instruction, the generated reactive power instruction is issued to the wind turbine generator, the voltage value of the main transformer low-voltage side of the reactive compensation device is calculated and obtained according to the main transformer voltage parameter of the wind power plant, and the generated voltage instruction is issued to the reactive compensation device; the reactive power compensation device performs reactive power regulation according to the voltage instruction, performs tracking control on the voltage of a grid connection point, and performs regulation and suppression when transient voltage occurs; the wind turbine generator system carries out reactive power regulation according to a reactive instruction issued by the wind power plant AVC, reactive replacement of a reactive compensation device is carried out in the reactive power regulation process of the wind turbine generator system, a certain reactive margin of the reactive compensation device is kept, when voltage fluctuation occurs in a power grid system, the reactive compensation device can be used for quickly restraining voltage fluctuation in a constant voltage control mode, the effect of stabilizing the power grid voltage is achieved, the problem that response voltage fluctuation cannot be quickly tracked under a conventional wind power plant AVC control strategy is avoided, and the wind power plant has the tracking regulation capability in a steady state and the quick tracking regulation capability in a transient state fluctuation state.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a reactive voltage control method for fast suppressing transient voltage according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a calculation flow of reactive power and voltage values according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a reactive voltage control system for fast transient voltage suppression according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and to practice the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
As will be appreciated by one skilled in the art, embodiments of the present invention may be embodied as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the form of: entirely hardware, entirely software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
According to the embodiment of the invention, a reactive voltage control method and a system for rapidly restraining transient voltage are provided. By using the method and the system, the wind power plant can have the capability of tracking and adjusting in a steady state and the capability of quickly tracking and adjusting the voltage in a transient state, and the problem that the voltage fluctuation can not be quickly tracked and responded under the conventional AVC control strategy of the wind power plant is solved. Meanwhile, a different control parameter setting method can be provided for the problem that reactive voltage sensitivity of systems accessed to different wind power places is different, and adaptability to different systems is stronger. And aiming at the wind power field with a plurality of sets of reactive compensation devices, a differentiated reactive compensation device control mode is provided, and by means of the combination of the constant voltage control mode and the reactive control mode of the reactive compensation devices, the rapid tracking control of the voltage is ensured, and reactive countermodulation and oscillation of a plurality of sets of reactive compensation device equipment in the constant voltage control mode are avoided.
The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments of the invention.
Fig. 1 is a schematic flow chart of a reactive voltage control method for fast suppressing transient voltage according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step S1, the wind farm AVC calculates reactive power to be regulated by the wind farm according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, calculates a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind farm, and generates a voltage instruction and sends the voltage instruction to the reactive compensation device;
step S2, the reactive compensation device carries out reactive adjustment according to the voltage instruction, carries out tracking control on the voltage of the grid-connected point, and carries out adjustment suppression when transient voltage appears;
and step S3, the wind turbine generator performs reactive power regulation according to a reactive power instruction issued by the wind power station AVC, performs reactive power replacement of the reactive power compensation device in the reactive power regulation process of the wind turbine generator, and keeps the reactive power compensation device to have certain reactive power margin.
Based on the control method, the reactive power compensation device can quickly track and control the voltage fluctuation, immediately adjust and inhibit when transient voltage appears, and does not need to wait for a control period; when the wind turbine generator system carries out reactive power regulation, reactive power replacement can be carried out on the reactive power compensation device, and the reactive power device is guaranteed to always keep sufficient reactive power margin so as to deal with voltage fluctuation appearing next time.
In order to explain the above-mentioned reactive voltage control method for rapidly suppressing transient voltage more clearly, each step is described in detail below.
And step S1, the wind farm AVC calculates the reactive power to be regulated by the wind farm according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, calculates the voltage value of the main transformer low-voltage side of the reactive compensation device according to the main transformer parameter of the wind farm, and generates a voltage instruction and sends the voltage instruction to the reactive compensation device.
Referring to fig. 2, the specific calculation process of the reactive power and voltage values is as follows:
step S101, after the wind farm AVC receives a target voltage instruction value, calculating to obtain a reactive voltage sensitive coefficient of the wind farm, wherein the calculation formula of the reactive voltage sensitive coefficient is as follows:
wherein, X1、X2Is a process variable, U1For the last time point of grid-connected point voltage measurement, Q1For the last moment of the grid-connected point reactive power measurement, U2For the current moment of the grid-connected point voltage measurement, Q2And Z is a reactive power measurement value of a grid connection point at the current moment and is a reactive voltage sensitivity coefficient.
In this embodiment, the reactive voltage sensitivity coefficient of the wind farm is calculated periodically and cyclically, and the average value of data in four hours is selected as the current reactive voltage sensitivity coefficient, so that large fluctuation of numerical calculation caused by sudden fluctuation of the system is avoided, and the accuracy of the numerical value is ensured.
Step S102, the wind farm AVC calculates the reactive power to be regulated by the wind farm according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, wherein,
the calculation formula of the reactive power to be regulated by the wind power plant is as follows:
Qref＝(Uafter-Ubefor)×Z；
wherein, UafterTarget voltage command value, U, received for wind farm AVCberefIs the current voltage value, Q, of the wind farmrefAnd transmitting the reactive power to the wind turbine generator set for the calculated reactive power to be adjusted of the wind power plant.
Step S103, calculating to obtain a voltage instruction value of a main transformer low-voltage side of the reactive compensation device according to the reactive voltage sensitivity coefficient of the wind power plant, and issuing a generated voltage instruction to the reactive compensation device for tracking control of a voltage target instruction; wherein, the calculation formula of the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is as follows:
Uref＝(Uafter×(1-1/Z))/R；
wherein, UafterA target voltage instruction value received by AVC of the wind power plant, Z is a reactive voltage sensitive systemThe number R is the voltage transformation ratio of the high-voltage side and the low-voltage side of a main transformer of the wind power plant, UrefAnd the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is obtained.
Step S2, the reactive compensation device carries out reactive adjustment according to the voltage instruction, carries out tracking control on the voltage of the grid-connected point, and carries out adjustment suppression when transient voltage appears;
and step S3, the wind turbine generator performs reactive power regulation according to a reactive power instruction issued by the wind power station AVC, performs reactive power replacement of the reactive power compensation device in the reactive power regulation process of the wind turbine generator, and keeps the reactive power compensation device to have certain reactive power margin.
In this embodiment, the method further includes:
setting control parameters of a voltage control mode of the reactive power compensation device; specifically, when the reactive power compensation device and the wind turbine generator set perform reactive voltage regulation, the regulation speed of the reactive power compensation device in a constant voltage mode is higher than that of the reactive power regulation speed of the wind turbine generator set, and in order to ensure the stability of the reactive power regulation of the reactive power compensation device and the wind turbine generator set, the voltage slope coefficient of the reactive power compensation device is regulated according to the current reactive voltage sensitivity coefficient; when the sensitivity coefficient is less than 10, setting the voltage slope coefficient of the reactive power compensation device to be 0.1% -1%; and when the sensitivity coefficient is larger than 10, setting the voltage slope coefficient of the reactive power compensation device to be 1% -10%.
In the present embodiment, referring to fig. 3, a schematic diagram of a reactive voltage control system for fast suppressing transient voltage according to an embodiment of the present invention is shown. The low-voltage side of a main transformer of the wind power plant at least comprises two sets of reactive compensation devices; one set of reactive compensation device is set to be in a main transformer low-voltage side constant voltage control mode and used for receiving a voltage instruction issued by the wind power plant AVC, and the other reactive compensation devices are set to be in a reactive control mode and used for receiving a reactive power instruction issued by the wind power plant AVC.
In the existing technical scheme, a wind power plant AVC control system issues a reactive power instruction to a wind turbine generator and a reactive power compensation device, so that tracking control of grid-connected point voltage can be realized in a steady state, but tracking control cannot be quickly realized when system voltage fluctuates, therefore, compared with the prior art, the reactive voltage control method for quickly suppressing transient voltage provided by the invention has at least the following advantages:
1. the wind power plant has the capability of tracking and adjusting in a steady state and the capability of quickly tracking and adjusting the voltage in a transient state, and the problem that the voltage fluctuation cannot be quickly tracked and responded under the conventional wind power plant AVC control strategy is solved.
2. Aiming at the problem that reactive voltage sensitivity of access systems of different wind power places is different, a different control parameter setting method is provided, and adaptability to different systems is stronger.
3. Aiming at a wind power plant with a plurality of sets of reactive compensation devices, a differentiated reactive compensation device control mode is provided, and by means of a mode of combining a constant voltage control mode and a reactive control mode of the reactive compensation devices, the rapid tracking control of voltage is guaranteed, and reactive back-harmonic oscillation of a plurality of sets of reactive compensation device equipment in the constant voltage control mode is avoided.
It should be noted that although the operations of the method of the present invention have been described in the above embodiments and the accompanying drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the operations shown must be performed, to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
Having described the method of an exemplary embodiment of the present invention, the reactive voltage control system for fast suppression of transient voltages of an exemplary embodiment of the present invention is next described with reference to fig. 3.
The implementation of the reactive voltage control system for rapidly suppressing the transient voltage can be referred to the implementation of the above method, and repeated details are not repeated. The term "module" or "unit" used hereinafter may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Based on the same inventive concept, the present invention further provides a reactive voltage control system for fast suppressing transient voltage, as shown in fig. 3, the system includes: wind power plant AVC, reactive power compensation device and wind turbine generator; wherein the content of the first and second substances,
the wind power plant AVC is used for calculating reactive power to be regulated by the wind power plant according to the received target voltage instruction, generating a reactive power instruction and issuing the reactive power instruction to the wind turbine generator, calculating a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind power plant, and generating a voltage instruction and issuing the voltage instruction to the reactive compensation device;
the reactive power compensation device is used for performing reactive power regulation according to the voltage instruction, performing tracking control on the voltage of a grid connection point, and performing regulation and suppression when transient voltage occurs;
the wind turbine generator is used for carrying out reactive power regulation according to a reactive instruction issued by the wind power station AVC, carrying out reactive power replacement on the reactive power compensation device in the reactive power regulation process of the wind turbine generator, and keeping the reactive power compensation device to have certain reactive power margin.
The low-voltage side of a main transformer of the wind power plant at least comprises two sets of reactive compensation devices; one set of reactive compensation device is set to be in a main transformer low-voltage side constant voltage control mode and used for receiving a voltage instruction issued by the wind power plant AVC, and the other reactive compensation devices are set to be in a reactive control mode and used for receiving a reactive power instruction issued by the wind power plant AVC.
It should be noted that although in the above detailed description several modules of the reactive voltage control system for fast suppression of transient voltages are mentioned, this division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the modules described above may be embodied in one module according to embodiments of the invention. Conversely, the features and functions of one module described above may be further divided into embodiments by a plurality of modules.
Based on the aforementioned inventive concept, as shown in fig. 4, the present invention further provides a computer device 400, which includes a memory 410, a processor 420, and a computer program 430 stored on the memory 410 and executable on the processor 420, wherein the processor 420 executes the computer program 430 to implement the aforementioned reactive voltage control method for fast suppressing transient voltage.
Based on the foregoing inventive concept, the present invention proposes a computer-readable storage medium storing a computer program which, when executed by a processor, implements the aforementioned reactive voltage control method of rapidly suppressing a transient voltage.
According to the reactive voltage control method and the system for quickly suppressing the transient voltage, the reactive power to be regulated by the wind power plant is calculated and obtained by the wind power plant AVC according to the received target voltage instruction, the generated reactive power instruction is issued to the wind turbine generator, the voltage value of the main transformer low-voltage side of the reactive compensation device is calculated and obtained according to the main transformer voltage parameter of the wind power plant, and the generated voltage instruction is issued to the reactive compensation device; the reactive power compensation device performs reactive power regulation according to the voltage instruction, performs tracking control on the voltage of a grid connection point, and performs regulation and suppression when transient voltage occurs; the wind turbine generator system carries out reactive power regulation according to a reactive instruction issued by the wind power plant AVC, reactive replacement of a reactive compensation device is carried out in the reactive power regulation process of the wind turbine generator system, a certain reactive margin of the reactive compensation device is kept, when voltage fluctuation occurs in a power grid system, the reactive compensation device can be used for quickly restraining voltage fluctuation in a constant voltage control mode, the effect of stabilizing the power grid voltage is achieved, the problem that response voltage fluctuation cannot be quickly tracked under a conventional wind power plant AVC control strategy is avoided, and the wind power plant has the tracking regulation capability in a steady state and the quick tracking regulation capability in a transient state fluctuation state.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A reactive voltage control method for fast suppressing transient voltage, the method comprising:
the AVC of the wind power plant calculates the reactive power to be regulated by the wind power plant according to the received target voltage instruction, generates a reactive power instruction and sends the reactive power instruction to the wind turbine generator, calculates the voltage value of the main transformer low-voltage side of the reactive power compensation device according to the main transformer voltage parameter of the wind power plant, and generates a voltage instruction and sends the voltage instruction to the reactive power compensation device;
the reactive power compensation device performs reactive power regulation according to the voltage instruction, performs tracking control on the voltage of a grid connection point, and performs regulation and suppression when transient voltage occurs;
the wind turbine generator system carries out reactive power regulation according to a reactive power instruction issued by the wind power plant AVC, reactive power replacement of the reactive power compensation device is carried out in the reactive power regulation process of the wind turbine generator system, and the reactive power compensation device is kept to have certain reactive power margin.
2. The method of claim 1, further comprising:
after the AVC of the wind power plant receives the target voltage instruction value, calculating to obtain a reactive voltage sensitivity coefficient of the wind power plant, wherein the calculation formula of the reactive voltage sensitivity coefficient is as follows:
wherein, X1、X2Is a process variable, U1For the last time point of grid-connected point voltage measurement, Q1For last moment grid-connected point reactive power measurementMagnitude, U2For the current moment of the grid-connected point voltage measurement, Q2And Z is a reactive power measurement value of a grid connection point at the current moment and is a reactive voltage sensitivity coefficient.
3. The method according to claim 2, characterized in that the reactive voltage sensitivity coefficient of the wind farm is calculated periodically and cyclically, and the average value of the data in four hours is selected as the current reactive voltage sensitivity coefficient.
4. The method according to claim 2, wherein the wind farm AVC calculates the reactive power to be regulated by the wind farm according to the received target voltage command, generates a reactive power command and sends the reactive power command to the wind turbine generator, and comprises the following steps:
the calculation formula of the reactive power to be regulated by the wind power plant is as follows:
Qref＝(Uafter-Ubefor)×Z；
wherein, UafterTarget voltage command value, U, received for wind farm AVCberefIs the current voltage value, Q, of the wind farmrefAnd transmitting the reactive power to the wind turbine generator set for the calculated reactive power to be adjusted of the wind power plant.
5. The method according to claim 2, wherein the wind farm AVC calculates a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind farm, generates a voltage command and sends the voltage command to the reactive compensation device, and comprises the following steps:
calculating to obtain a voltage instruction value of a main transformer low-voltage side of the reactive compensation device according to the reactive voltage sensitivity coefficient of the wind power plant, and issuing a generated voltage instruction to the reactive compensation device for tracking control of a voltage target instruction; wherein, the calculation formula of the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is as follows:
Uref＝(Uafter×(1-1/Z))/R；
wherein, UafterA target voltage command value received for wind farm AVC, Z beingReactive voltage sensitivity coefficient, R is the voltage transformation ratio of the high-voltage side and the low-voltage side of a main transformer of a wind power plant, UrefAnd the voltage instruction value of the main transformer low-voltage side of the reactive power compensation device is obtained.
6. The method of claim 5, further comprising:
setting control parameters of a voltage control mode of the reactive power compensation device; adjusting the voltage slope coefficient of the reactive power compensation device according to the current reactive voltage sensitivity coefficient, and setting the voltage slope coefficient of the reactive power compensation device to be 0.1% -1% when the sensitivity coefficient is less than 10; and when the sensitivity coefficient is larger than 10, setting the voltage slope coefficient of the reactive power compensation device to be 1% -10%.
7. The method according to claim 1, characterized in that the main transformer low-voltage side of the wind farm comprises at least two sets of reactive compensation devices; one set of reactive compensation device is set to be in a main transformer low-voltage side constant voltage control mode and used for receiving a voltage instruction issued by the wind power plant AVC, and the other reactive compensation devices are set to be in a reactive control mode and used for receiving a reactive power instruction issued by the wind power plant AVC.
8. A reactive voltage control system for fast suppression of transient voltages, the system comprising: wind power plant AVC, reactive power compensation device and wind turbine generator; wherein the content of the first and second substances,
the wind power plant AVC is used for calculating reactive power to be regulated by the wind power plant according to the received target voltage instruction, generating a reactive power instruction and issuing the reactive power instruction to the wind turbine generator, calculating a voltage value of a main transformer low-voltage side of the reactive compensation device according to a main transformer parameter of the wind power plant, and generating a voltage instruction and issuing the voltage instruction to the reactive compensation device;
the reactive power compensation device is used for performing reactive power regulation according to the voltage instruction, performing tracking control on the voltage of a grid connection point, and performing regulation and suppression when transient voltage occurs;
the wind turbine generator is used for carrying out reactive power regulation according to a reactive instruction issued by the wind power station AVC, carrying out reactive power replacement on the reactive power compensation device in the reactive power regulation process of the wind turbine generator, and keeping the reactive power compensation device to have certain reactive power margin.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the method of any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116632860A (en) * | 2023-07-24 | 2023-08-22 | 国能日新科技股份有限公司 | Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116632860A (en) * | 2023-07-24 | 2023-08-22 | 国能日新科技股份有限公司 | Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station |
| CN116632860B (en) * | 2023-07-24 | 2023-10-10 | 国能日新科技股份有限公司 | Reactive replacement method, reactive replacement device, reactive replacement equipment and reactive replacement medium for new energy station |
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