CN113708386B - Method, device, equipment and medium for determining stability domain of offshore wind power network - Google Patents
Method, device, equipment and medium for determining stability domain of offshore wind power network Download PDFInfo
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- CN113708386B CN113708386B CN202110986462.5A CN202110986462A CN113708386B CN 113708386 B CN113708386 B CN 113708386B CN 202110986462 A CN202110986462 A CN 202110986462A CN 113708386 B CN113708386 B CN 113708386B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention discloses a method, a device, equipment and a medium for determining a stability domain of an offshore wind power network, wherein the method comprises the following steps: determining a current stable domain boundary point according to the active power of any two offshore wind power plants, determining second active power of the first offshore wind power plant according to the active power and the first active power increment of the first offshore wind power plant, determining second active power of the second offshore wind power plant according to the active power and the second active power increment of the second offshore wind power plant, determining a second stable domain boundary point, traversing all operating parameters in sequence by taking the second stable domain boundary point as an initial value, calculating a plurality of new stable domain boundary points, determining the end of operation if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value, and further determining the stable domain boundary. According to the invention, the parameter space is constructed by the active power of the offshore wind power grid, all the operation parameters are traversed by adopting an incremental calculation mode, the calculated amount is reduced, and the efficiency of constructing the stable domain is improved.
Description
Technical Field
The invention relates to the technical field of research on subsynchronous oscillation stability domains of offshore wind power grid-connected systems, in particular to a method, a device, equipment and a medium for determining an offshore wind power grid stability domain.
Background
In recent years, offshore wind power is developed on a large scale by virtue of the advantages of high wind energy density, high power generation and utilization hours, close distance from a load center and the like. However, the interaction between the wind farm and the power grid can cause subsynchronous oscillation accidents, which reduce the quality of electric energy, destroy the safety of equipment and endanger the reliable operation of the power grid. In order to analyze the subsynchronous oscillation stability of the offshore wind power grid-connected system at different operation points and measure the stability margin of the system, a subsynchronous oscillation stability domain of the system needs to be constructed, and important information is provided for subsynchronous oscillation prevention and control.
The existing stability domain facing subsynchronous oscillation prevention and control is mostly a parameter stability domain, namely, the influence of system structural parameters and controller parameters on the subsynchronous oscillation stability of the system is considered. Because the subsynchronous oscillation stability of the offshore wind power grid-connected system is closely related to the system operation point, the existing parameter stability domain is difficult to provide guidance for the safe and stable operation of the system. In addition, the existing stable domain solving method mostly adopts a point-by-point traversal method, so that the searching times are high, the calculated amount is large, and the efficiency is low. Therefore, a fast solving method of the running stability domain facing to subsynchronous oscillation prevention and control of the offshore wind power grid-connected system is needed to be provided.
In the prior art, no solving method aiming at the subsynchronous oscillation stable domain of the offshore wind power grid-connected system exists, and the existing implementation scheme which is most similar to the method is to solve the small disturbance stable domain of the electric power system by adopting a point-by-point traversal method. The point-by-point method can improve the precision of the obtained boundary points by changing the step length along the ray searching direction, and can set the searching density of the fine searching direction so as to ensure the precision of the obtained stable domain, however, the method has large calculation amount and low speed, and finally has low efficiency.
Disclosure of Invention
The invention aims to provide a method, a device, equipment and a medium for determining a stable domain of an offshore wind power network, so as to solve the problem of low searching efficiency of the stable domain in the prior art.
In order to achieve the above object, the present invention provides a method for determining a stability domain of an offshore wind power network, comprising:
constructing operation parameters of a parameter space according to a plurality of active powers output by a plurality of offshore wind farms;
determining a current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, wherein the current stable domain boundary point comprises the active power of a first offshore wind farm and the active power of a second offshore wind farm;
respectively calculating active power increment of the two selected offshore wind farms, wherein the active power increment comprises a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm;
determining a second active power of the first offshore wind farm according to a summation of the active power of the first offshore wind farm and the first active power increment, and determining a second active power of the second offshore wind farm according to a summation of the active power of the second offshore wind farm and the second active power increment;
determining a second stability domain boundary point according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm;
setting the currently determined second stable domain boundary point as an initial value for further determining a new stable domain boundary point, traversing all the operation parameters in sequence, calculating a plurality of the new stable domain boundary points, and determining that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value;
and determining a stable domain boundary by combining the current stable domain boundary point and a plurality of new stable domain boundary points.
Preferably, if the active power of the new stability domain boundary point is greater than or equal to a preset threshold, determining that the operation is finished is specifically:
sequentially traversing all the operation parameters, wherein the active power of the new stable domain boundary point comprises the N active power of the first offshore wind farm and the N active power of the second offshore wind farm;
and if the Nth active power of the first offshore wind farm is greater than or equal to the maximum value of the active power of the first offshore wind farm, determining that the operation is finished.
Preferably, the determining the current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm includes:
judging whether a subsynchronous mode is stable or not according to the active power of the first offshore wind power plant and the active power of the second offshore wind power plant, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the active power of the first offshore wind farm unchanged, reducing the active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the current stable domain;
if the subsynchronous mode is judged to be stable, keeping the second active power of the second offshore wind power plant unchanged, increasing the active power of the first offshore wind power plant by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and determining the boundary point of the current stable domain.
Preferably, the determining a second stability domain boundary point according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm includes:
judging whether a subsynchronous mode is stable or not according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the second active power of the first offshore wind farm unchanged, and reducing the second active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the second stable domain;
if the subsynchronous mode is judged to be stable, the second active power of the second offshore wind power plant is kept unchanged, the second active power of the first offshore wind power plant is increased by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and the boundary point of the second stable domain is determined.
The invention also provides a device for determining the stability domain of the offshore wind power network, which comprises the following steps:
the acquisition module is used for constructing operation parameters of a parameter space according to a plurality of active powers output by a plurality of offshore wind farms;
the first calculation module is used for determining a current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, wherein the current stable domain boundary point comprises the active power of the first offshore wind farm and the active power of the second offshore wind farm;
the second calculation module is used for calculating the active power increment of the two selected offshore wind farms respectively, wherein the active power increment comprises a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm;
a third calculation module, configured to determine a second active power of the first offshore wind farm according to a sum of the active power of the first offshore wind farm and the first active power increment, and determine a second active power of the second offshore wind farm according to a sum of the active power of the second offshore wind farm and the second active power increment;
a fourth calculation module, configured to determine a second stability domain boundary point according to a second active power of the first offshore wind farm and a second active power of the second offshore wind farm;
the operation module is used for setting the currently determined second stable domain boundary point as an initial value for further determining a new stable domain boundary point, traversing all the operation parameters in sequence, calculating a plurality of the new stable domain boundary points, and determining that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value;
the determining module is used for determining a stable domain boundary by combining the current stable domain boundary point and a plurality of new stable domain boundary points.
Preferably, the operation module is further configured to:
sequentially traversing all the operation parameters, wherein the active power of the new stable domain boundary point comprises the N active power of the first offshore wind farm and the N active power of the second offshore wind farm;
and if the Nth active power of the first offshore wind farm is greater than or equal to the maximum value of the active power of the first offshore wind farm, determining that the operation is finished.
Preferably, the first computing module is further configured to:
judging whether a subsynchronous mode is stable or not according to the active power of the first offshore wind power plant and the active power of the second offshore wind power plant, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the active power of the first offshore wind farm unchanged, reducing the active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the current stable domain;
if the subsynchronous mode is judged to be stable, keeping the second active power of the second offshore wind power plant unchanged, increasing the active power of the first offshore wind power plant by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and determining the boundary point of the current stable domain.
Preferably, the fourth computing module is further configured to:
judging whether a subsynchronous mode is stable or not according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the second active power of the first offshore wind farm unchanged, and reducing the second active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the second stable domain;
if the subsynchronous mode is judged to be stable, the second active power of the second offshore wind power plant is kept unchanged, the second active power of the first offshore wind power plant is increased by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and the boundary point of the second stable domain is determined.
The invention also provides a terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the offshore wind grid stability domain determination method of any of the above.
The invention also provides a computer readable storage medium having stored thereon a computer program for execution by a processor to implement a method of determining a stability domain of an offshore wind network as described in any of the above.
Compared with the prior art, the invention has the beneficial effects that:
according to the active power output by a plurality of offshore wind power plants, constructing operation parameters of a parameter space, taking any two of the offshore wind power plants, determining a current stable domain boundary point according to the active power of any two of the offshore wind power plants, wherein the current stable domain boundary point comprises the active power of a first offshore wind power plant and the active power of a second offshore wind power plant, respectively calculating the active power increment of the offshore wind power plant, determining the active power of a new first offshore wind power plant according to the active power of the first offshore wind power plant and the corresponding active power increment, determining the active power of a new second offshore wind power plant according to the active power of the second offshore wind power plant and the corresponding active power increment, determining a new stable domain boundary point according to the active power of the new first offshore wind power plant and the active power of the new second offshore wind power plant, calculating a plurality of new domain boundary points, and determining the stable domain boundary points by combining the new active power of the new first offshore wind power plant with the corresponding active power increment, determining the stable domain boundary point, and the stable domain boundary points when the new first offshore wind power plant is more than or equal to the new active power and the new stable domain boundary points, and the stable domain boundary points are fully found, and the stable domain boundary is fully improved.
And further determining a new stable domain boundary point according to the stability of the subsynchronous mode, and further improving the searching precision and the searching speed.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for determining a stability domain of an offshore wind network according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for determining a stability domain of an offshore wind network according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an offshore wind network stability domain determination device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a computer terminal device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the step numbers used herein are for convenience of description only and are not limiting as to the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, 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" and "comprising" indicate the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for determining a stability domain of an offshore wind power network, including the following steps:
s101: and constructing the operation parameters of the parameter space according to the plurality of active powers output by the plurality of offshore wind farms.
Specifically, because the interaction between the offshore wind farm and the power grid can cause subsynchronous oscillation accidents, a subsynchronous oscillation stable domain of the system needs to be built, active power of a plurality of offshore wind farms is extracted to build a parameter space, and operation parameters in the parameter space are active power of each wind farm.
S102: and determining a current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, wherein the current stable domain boundary point comprises the active power of the first offshore wind farm and the active power of the second offshore wind farm.
Specifically, assuming that the target system comprises two wind power plants, taking the two wind power plants as an illustration of a search process of a subsynchronous oscillation stable domain, setting a value range of an operation parameter according to the actual condition of the target, extracting active power of any two wind power plants, setting an active power interval, and recording the active power interval output by the first offshore wind power plant as [ P 1min ,P 1max ]The active power interval output by the second offshore wind farm is recorded as [ P ] 2min ,P 2max ]. Setting the active power change step length delta P output by each wind power plant, and setting the active power output by the first offshore wind power plant as the minimum value P of the boundary point of the current stable domain 1 I.e. P 1 ＝P 1min Setting the active power output by the second offshore wind farm as the maximum value P of the boundary point of the current stable domain 2 I.e. P 2 ＝P 2min The current stability domain boundary point is (P 1 ,P 2 )。
Determining the current stability domain boundary point (P 1 ,P 2 ) If the stability is determined, the next calculation can be performed, the stability of the boundary point of the current stable domain is determined by judging the stability of the subsynchronous mode, whether the subsynchronous mode is stable or not is judged according to the active power of the first offshore wind power plant and the active power of the second offshore wind power plant, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, the stability is judged, and otherwise, the subsynchronous mode is unstable. If the subsynchronous mode is judged to be unstable, the active power of the first offshore wind farm is kept unchanged, and the active power of the second offshore wind farm is reduced by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and the method specifically comprises the following steps:
judging that the system is at the operation point (P 1 ,P 2 ) Next, stability of subsynchronous pattern, if subsynchronous pattern is stable, (P) 1 ,P 2 ) Namely, the boundary point of the current stable domain is represented by t=1, t represents the determined sequence of the boundary points, and the first boundary point is recorded as P 1 1 ＝P 1 ,P 2 1 ＝P 2 If the subsynchronous mode is unstable, p is maintained 1 Gradually reducing the output active power of the second offshore wind farm by a step delta p without changing until the system subsynchronous mode is unstable to stable, namely the oscillation damping of the subsynchronous mode is greater than or equal to zero, and recording the output active power value p of the second offshore wind farm at the moment 2 ,(p 1 ,p 2 ) I.e. the first stable domain boundary point, when t=1, the first boundary point is recorded as
S103: and respectively calculating the active power increment of the two selected offshore wind farms, wherein the active power increment comprises a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm.
Specifically, near the last critical point, searching a sub-synchronous oscillation critical stable point as the next stable domain boundary point until all boundary points in all research operation parameter ranges are obtained, judging the size of t, if t=1, executing step S102, and if t >1, calculating a new boundary point, and increasing the active power output by each offshore wind farm.
Assume that the increment of active power of the first wind power plant isΔP 1 Representing an increase in active power of the first offshore wind farm for the new boundary point compared to the previous boundary point.
Assume that the increment of the active power of the second wind power plant isΔP 2 Representing new boundary points and upper two edgesAnd the boundary point is compared with the increment of the active power of the second offshore wind farm.
S104: and determining a second active power of the first offshore wind farm according to the sum of the active power of the first offshore wind farm and the first active power increment, and determining the second active power of the second offshore wind farm according to the sum of the active power of the second offshore wind farm and the second active power increment.
Specifically, according to the active power increment calculated in step S103, the second active power of the first offshore wind farm and the second active power of the second offshore wind farm are determined as follows:
P 1 '＝P 1 +ΔP 1 ,P 2 '＝P 2 +ΔP 2 ；
wherein P is 1 ' represents the second active power, P, of the first offshore wind farm 2 ' represents the second active power of the second offshore wind farm.
S105: and determining a second stability domain boundary point according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm.
Specifically, a second stability domain boundary point (P) is determined based on the second active power of the first offshore wind farm and the second active power of the second offshore wind farm calculated in step S104 1 ',P 2 ') judging the second stable domain boundary point (P) of the system under the running state again 1 ',P 2 ') stability as follows:
judging that the system is at the operation point (P 1 ',P 2 ') stability of subsynchronous mode, if subsynchronous mode is unstable, P is maintained 1 'unchanged,' step-down the output active power of the second offshore wind farm by a step-down Δp until the subsynchronous mode is unstable to stable, noting the P at that time 2 ' value, (P) 1 ',P 2 ') is the next stable domain boundary point, let t=t+1, and the t boundary point is recorded as the tIf the subsynchronous mode is stable, keep P 2 'unchanged,' step-up the output active power of the first offshore wind farm by a step-up Δp until the subsynchronous mode is from stable to unstable, noting the P at that time 1 ' value, (P) 1 ',P 2 ') is the next stability domain boundary point, let t=t+1, and the t boundary point is denoted as +.>
S106: setting the currently determined second stable domain boundary point as an initial value for further determining a new stable domain boundary point, traversing all the operation parameters in sequence, calculating a plurality of the new stable domain boundary points, and determining that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value.
Specifically, all the operation parameters are traversed in sequence, the active power of the new stable domain boundary point comprises the N active power of the first offshore wind farm and the N active power of the second offshore wind farm, and if the N active power of the first offshore wind farm is greater than or equal to the maximum value of the active power of the first offshore wind farm, the operation is determined to be finished.
Judging P 1 ' size, if P 1 '≥P 1max Step S107 is performed, if P 1 '<P 1max Then the calculation of new boundary points continues.
S107: and determining a stable domain boundary by combining the current stable domain boundary point and a plurality of new stable domain boundary points.
Specifically, all boundary points are connected to form a stable domain boundary, and the sub-synchronous oscillation stable domain of the offshore wind power grid-connected system is formed inside the boundary.
Compared with the prior art, the invention fully utilizes the change rule of the slope at the boundary point and the close distance between the adjacent boundary points, and takes the last boundary point plus the power increment as the starting point for searching the next boundary point, thereby greatly reducing the searching times, ensuring the searching precision of the stable domain and improving the searching efficiency of the stable domain.
Referring to fig. 3, another embodiment of the present invention provides an offshore wind power network stability domain determining apparatus, including:
the obtaining module 11 is configured to construct an operation parameter of the parameter space according to a plurality of active powers output by a plurality of offshore wind farms.
The first calculation module 12 is configured to determine a current stability domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, where the current stability domain boundary point includes the active power of the first offshore wind farm and the active power of the second offshore wind farm.
The second calculating module 13 is configured to calculate active power increments of the two selected offshore wind farms, where the active power increments include a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm.
A third calculation module 14, configured to determine a second active power of the first offshore wind farm according to a sum of the active power of the first offshore wind farm and the first active power increment, and determine a second active power of the second offshore wind farm according to a sum of the active power of the second offshore wind farm and the second active power increment.
A fourth calculation module 15, configured to determine a second stability domain boundary point according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm.
The operation module 16 is configured to set the second stable domain boundary point that is currently determined as an initial value for further determining a new stable domain boundary point, sequentially traverse all the operation parameters, calculate a plurality of the new stable domain boundary points, and determine that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold.
A determining module 17, configured to combine the current stability domain boundary point with a plurality of the new stability domain boundary points to determine a stability domain boundary.
The specific limitation of the offshore wind power network stability domain determining device can be referred to as limitation of the offshore wind power network stability domain determining method, and is not described herein. The above-mentioned each module in the marine wind power network stability domain determining device may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Referring to fig. 4, an embodiment of the present invention provides a terminal device, including:
one or more processors;
a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the offshore wind grid stability domain determination method as described above.
The processor is used for controlling the whole operation of the computer terminal equipment so as to complete all or part of the steps of the method for determining the stability domain of the offshore wind power network. The memory is used to store various types of data to support operation at the computer terminal device, which may include, for example, instructions for any application or method operating on the computer terminal device, as well as application-related data. The Memory may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk or optical disk.
In an exemplary embodiment, the computer terminal device may be implemented by one or more application specific integrated circuits (Application Specific, ntegrated Circuit, abbreviated AS 1C), digital signal processors (Digital Signal Processor, abbreviated AS DSP), digital signal processing devices (Digital Signal Processing Device, abbreviated AS DSPD), programmable logic devices (Programmable Logic Device, abbreviated AS PLD), field programmable gate arrays (Field Programmable Gate Array, abbreviated AS FPGA), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-described method for determining a stability domain of a offshore wind network, and achieving technical effects consistent with the above-described method.
In another exemplary embodiment, a computer readable storage medium is also provided, comprising program instructions which, when executed by a processor, implement the steps of the offshore wind network stability domain determination method in any of the embodiments described above. For example, the computer readable storage medium may be the above memory including program instructions executable by a processor of the computer terminal device to perform the above method for determining a stability domain of an offshore wind network, and achieve technical effects consistent with the above method.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. The method for determining the stability domain of the offshore wind power network is characterized by comprising the following steps of:
constructing operation parameters of a parameter space according to a plurality of active powers output by a plurality of offshore wind farms;
determining a current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, wherein the current stable domain boundary point comprises the active power of a first offshore wind farm and the active power of a second offshore wind farm;
respectively calculating active power increment of the two selected offshore wind farms, wherein the active power increment comprises a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm;
determining a second active power of the first offshore wind farm according to a summation of the active power of the first offshore wind farm and the first active power increment, and determining a second active power of the second offshore wind farm according to a summation of the active power of the second offshore wind farm and the second active power increment;
determining a second stability domain boundary point according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm;
setting the currently determined second stable domain boundary point as an initial value for further determining a new stable domain boundary point, traversing all the operation parameters in sequence, calculating a plurality of the new stable domain boundary points, and determining that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value;
and determining a stable domain boundary by combining the current stable domain boundary point and a plurality of new stable domain boundary points.
2. The method for determining the stability domain of the offshore wind power network according to claim 1, wherein if the active power of the new stability domain boundary point is greater than or equal to a preset threshold, determining that the operation is finished is specifically:
sequentially traversing all the operation parameters, wherein the active power of the new stable domain boundary point comprises the N active power of the first offshore wind farm and the N active power of the second offshore wind farm;
and if the Nth active power of the first offshore wind farm is greater than or equal to the maximum value of the active power of the first offshore wind farm, determining that the operation is finished.
3. The method for determining the stability domain of the offshore wind farm according to claim 2, wherein the determining the boundary point of the current stability domain according to the active power of any two of the offshore wind farms comprises:
judging whether a subsynchronous mode is stable or not according to the active power of the first offshore wind power plant and the active power of the second offshore wind power plant, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the active power of the first offshore wind farm unchanged, reducing the active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the current stable domain;
if the subsynchronous mode is judged to be stable, keeping the second active power of the second offshore wind power plant unchanged, increasing the active power of the first offshore wind power plant by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and determining the boundary point of the current stable domain.
4. A method of determining a stability domain of an offshore wind farm according to claim 3, wherein the determining a second stability domain boundary point from the second active power of the first offshore wind farm and the second active power of the second offshore wind farm comprises:
judging whether a subsynchronous mode is stable or not according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the second active power of the first offshore wind farm unchanged, and reducing the second active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the second stable domain;
if the subsynchronous mode is judged to be stable, the second active power of the second offshore wind power plant is kept unchanged, the second active power of the first offshore wind power plant is increased by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and the boundary point of the second stable domain is determined.
5. An offshore wind power network stability domain determination device, comprising:
the acquisition module is used for constructing operation parameters of a parameter space according to a plurality of active powers output by a plurality of offshore wind farms;
the first calculation module is used for determining a current stable domain boundary point according to the active power of any two offshore wind farms in each offshore wind farm, wherein the current stable domain boundary point comprises the active power of the first offshore wind farm and the active power of the second offshore wind farm;
the second calculation module is used for calculating the active power increment of the two selected offshore wind farms respectively, wherein the active power increment comprises a first active power increment corresponding to the first offshore wind farm and a second active power increment corresponding to the second offshore wind farm;
a third calculation module, configured to determine a second active power of the first offshore wind farm according to a sum of the active power of the first offshore wind farm and the first active power increment, and determine a second active power of the second offshore wind farm according to a sum of the active power of the second offshore wind farm and the second active power increment;
a fourth calculation module, configured to determine a second stability domain boundary point according to a second active power of the first offshore wind farm and a second active power of the second offshore wind farm;
the operation module is used for setting the currently determined second stable domain boundary point as an initial value for further determining a new stable domain boundary point, traversing all the operation parameters in sequence, calculating a plurality of the new stable domain boundary points, and determining that the operation is finished if the active power of the new stable domain boundary point is greater than or equal to a preset threshold value;
the determining module is used for determining a stable domain boundary by combining the current stable domain boundary point and a plurality of new stable domain boundary points.
6. The offshore wind grid stability domain determination device of claim 5, wherein the operational module is further configured to:
sequentially traversing all the operation parameters, wherein the active power of the new stable domain boundary point comprises the N active power of the first offshore wind farm and the N active power of the second offshore wind farm;
and if the Nth active power of the first offshore wind farm is greater than or equal to the maximum value of the active power of the first offshore wind farm, determining that the operation is finished.
7. The offshore wind grid stability domain determination device of claim 6, wherein the first computing module is further configured to:
judging whether a subsynchronous mode is stable or not according to the active power of the first offshore wind power plant and the active power of the second offshore wind power plant, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the active power of the first offshore wind farm unchanged, reducing the active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the current stable domain;
if the subsynchronous mode is judged to be stable, keeping the second active power of the second offshore wind power plant unchanged, increasing the active power of the first offshore wind power plant by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and determining the boundary point of the current stable domain.
8. The offshore wind grid stability domain determination device of claim 7, wherein the fourth computing module is further configured to:
judging whether a subsynchronous mode is stable or not according to the second active power of the first offshore wind farm and the second active power of the second offshore wind farm, if the oscillation damping of the subsynchronous mode is greater than or equal to zero, judging that the subsynchronous mode is stable, otherwise, judging that the subsynchronous mode is unstable;
if the subsynchronous mode is unstable, keeping the second active power of the first offshore wind farm unchanged, and reducing the second active power of the second offshore wind farm by a preset active power step length until the oscillation damping of the subsynchronous mode is greater than or equal to zero, and determining the boundary point of the second stable domain;
if the subsynchronous mode is judged to be stable, the second active power of the second offshore wind power plant is kept unchanged, the second active power of the first offshore wind power plant is increased by a preset active power step length until the oscillation damping of the subsynchronous mode is smaller than zero, and the boundary point of the second stable domain is determined.
9. A computer terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the offshore wind grid stability domain determination method of any of claims 1-4.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements a method of determining a stability domain of an offshore wind network according to any of claims 1 to 4.
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