CN108092280B - Control method and device for static reactive power compensation device of fan - Google Patents
Control method and device for static reactive power compensation device of fan Download PDFInfo
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- CN108092280B CN108092280B CN201711448453.0A CN201711448453A CN108092280B CN 108092280 B CN108092280 B CN 108092280B CN 201711448453 A CN201711448453 A CN 201711448453A CN 108092280 B CN108092280 B CN 108092280B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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- 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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a control method and equipment for a static reactive power compensation device of a fan. The method comprises the following steps: judging whether the power factor at the grid-connected point of the fan meets a first preset requirement or not; if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not; if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and switching one or more of the capacitor banks if the duration is greater than or equal to a predetermined threshold. According to the SVC control method and the SVC control equipment for the fan, the voltage at the grid-connected point of the fan can be stabilized, the reactive power can be adjusted, the power factor is improved, the reactive loss and the overall power consumption of the wind power plant during the operation period are reduced, the overall investment and the economic loss are reduced, and the stable and safe operation of a power grid and the fan is ensured.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a control method and equipment of a Static Var Compensation (SVC) device for a fan.
Background
The existing SVC has the following problems: SVC faults are distributed dispersedly and comprise a main control board, a monitoring board, an absorption board, a trigger board, a silicon controlled rectifier, even a capacitor and a reactor; the damage rate of the SVC is relatively high in seasons where power consumption is large (e.g., winter); SVCs have a high damage rate in regions with high temperature and humidity (e.g., certain regions in the south of China); the SVC has poor process quality of each circuit board and nonstandard wiring, so that the working stability of the SVC is poor; the SVC control circuit adopts some chips with older models, so that the technology is laggard; in a current grid-connected operation-enabled SVC, a self-recovery SVC has a high failure rate.
In addition, the conventional SVC reactive compensation mainly researches various optimization designs of the concentrated reactive compensation SVC in the wind power plant, and does not research the influence of the SVC reactive compensation on a single fan.
Disclosure of Invention
In view of one or more of the above problems, the present invention provides a control method and apparatus for a Static Var Compensator (SVC) for a wind turbine, which can stabilize a voltage at a grid-connected point of the wind turbine, adjust a reactive power, improve a power factor, reduce a reactive loss and an overall power consumption of a wind farm during operation, and reduce an overall investment and an economic loss, thereby ensuring stable and safe operation of a grid and the wind turbine. In addition, the damage rate of vulnerable parts such as a capacitor bank and a silicon controlled rectifier of the SVC can be reduced, the service life is prolonged, and the maintenance rate is reduced, so that considerable labor cost and economic burden are saved for an owner.
According to a first aspect of embodiments of the present invention, there is provided a control method of a Static Var Compensation (SVC) for a wind turbine, including: judging whether the power factor at the grid-connected point of the fan meets a first preset requirement or not; if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not; if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and switching one or more of the capacitor banks if the duration is greater than or equal to a predetermined threshold.
According to a second aspect of embodiments of the present invention, there is provided a control apparatus for a static var power compensation device (SVC) of a wind turbine, comprising: a first judgment unit configured to: judging whether the power factor at the grid-connected point of the fan meets a first preset requirement or not; a second determination unit configured to: if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not; a third judgment unit configured to: if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and a switching unit configured to: and switching one or more groups of the capacitor groups if the duration is greater than or equal to a predetermined threshold.
In the control method and the control device for the Static Var Compensator (SVC) of the fan according to the embodiments of the present invention, by performing reactive power regulation using the SVC, not only can the voltage at the grid-connected point of the fan be stabilized, but also the reactive power can be regulated, the power factor is improved, the reactive loss and the overall power consumption of the wind farm during the operation are reduced, the overall investment and the economic loss are reduced, and thus the stable and safe operation of the grid and the fan is ensured. In addition, the switching time interval of the same capacitor bank and different capacitor banks is set, so that the breakage rate of the quick-wear part can be reduced, the service life is prolonged, and the maintenance rate is reduced, thereby saving considerable labor cost and economic burden for an owner.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic flow diagram of a control method for a static reactive power compensation device (SVC) for a wind turbine according to an embodiment of the present invention;
fig. 2 shows a schematic block diagram of a control arrangement for a static reactive power compensation device (SVC) for a wind turbine according to an embodiment of the present invention;
fig. 3 illustrates a block diagram of an exemplary hardware architecture of a computing device capable of implementing at least a portion of the control method and apparatus for a static reactive power compensation device (SVC) for a wind turbine according to embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is not limited to any specific configuration and algorithm set forth below, but covers any modification, replacement or improvement of elements, components and algorithms without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring aspects of the invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a schematic flow diagram of a control method for a static var power compensation (SVC) of a wind turbine according to an embodiment of the present invention. As shown in fig. 1, a control method 100 for a Static Var Compensation (SVC) of a wind turbine may include: s102, judging whether the power factor at the grid-connected point of the fan meets a first preset requirement or not; s104, if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not; s106, if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and S108, if the duration is more than or equal to a preset threshold, switching one or more groups of the capacitor groups.
Specifically, in S102, it may be determined whether the power factor at the grid-connected point of the fan satisfies a preset requirement. In some embodiments, the requirement for the power factor at the grid-tie point may be preset by the user according to actual needs. The requirement may for example be a certain threshold range for the power factor at the grid tie point. For example, the requirement for the power factor at the grid-connected point may be set in advance to-0.99 to + 0.99. In some embodiments, a default requirement for the power factor at the grid-connected point may be preset, and in the case where a user does not make a specific setting or change, the default requirement for the power factor at the grid-connected point may be applied. Furthermore, the default requirements for power factor at grid tie-in points can be altered to meet the actual needs of the user.
In some embodiments, in S102, if it is determined that the power factor at the grid-connected point of the wind turbine meets the preset requirement, the SVC does not need to perform any action.
In S102, if it is determined that the power factor at the grid-connected point of the wind turbine does not satisfy the preset requirement, in S104, it is determined whether the reactive power at the grid-connected point satisfies the preset requirement. In some embodiments, the requirement for reactive power at the grid-tie point may be preset by the user according to actual needs. The requirement may for example be a certain threshold range for reactive power at the grid tie point. For example, the requirement for reactive power at the grid-tie point may be preset to-40 kvar to +40kvar, which may be referred to as a reactive dead zone. In some embodiments, a default requirement for reactive power at the grid-connected point may be preset, and in the case that a user does not make a specific setting or change, the default requirement for reactive power at the grid-connected point may be applied. Furthermore, the default requirements for reactive power at the grid tie point can be altered to meet the actual needs of the customer.
In some embodiments, in S104, if it is determined that the reactive power at the grid-connected point of the wind turbine meets the preset requirement, the SVC does not need to perform any action.
In S104, if it is determined that the reactive power at the grid-connected point of the wind turbine does not satisfy the preset requirement, in S106, it is determined whether a duration for which the reactive power at the grid-connected point of the wind turbine does not satisfy the requirement for the reactive power at the grid-connected point is greater than or equal to a predetermined threshold. In some embodiments, the threshold for the duration may be preset by the user according to actual needs. For example, the threshold value of the duration may be set to 2 seconds in advance. In some embodiments, the threshold for the duration may be preset, and in the case where the user has not made a specific setting or change, a default threshold for the duration may be applied. Further, the default threshold for this duration may be altered to meet the actual needs of the user. For example, when the threshold value of the duration is set to 2 seconds in advance, it is necessary to determine whether or not the duration in which the reactive power at the grid-connected point of the wind turbine does not satisfy the requirement for the reactive power at the grid-connected point (i.e., exceeds the reactive dead zone) is 2 seconds or more. By setting the threshold value of the duration, the SVC can be prevented from generating misoperation due to frequent oscillation change of the reactive power.
In some embodiments, in S106, if it is determined that the reactive power at the grid-tied point of the wind turbine does not satisfy the required duration for the reactive power at the grid-tied point is less than the predetermined threshold, the SVC does not need to perform any action.
In S106, if it is determined that the duration of the reactive power at the grid-connected point of the wind turbine does not satisfy the requirement for the reactive power at the grid-connected point is equal to or greater than the predetermined threshold, in S108, one or more of the capacitor banks are switched in or out for reactive compensation based on whether the reactive power is lacking or redundant at the grid-connected point of the wind turbine, thereby satisfying the requirement for the reactive power at the grid-connected point.
In some embodiments, in S108, if it is determined that the reactive power at the grid-connected point of the wind turbine does not satisfy the required duration for the reactive power at the grid-connected point is greater than or equal to the predetermined threshold, it may be further determined whether the reactive power is absent or redundant at the grid-connected point of the wind turbine, so as to switch in or out one or more of the capacitor banks for reactive power compensation, by: if the reactive power at the grid-connected point of the fan is lower than the lower limit threshold in the requirement for the reactive power at the grid-connected point, putting one or more groups of capacitors into the capacitor bank; and if the reactive power at the grid-connected point of the fan is higher than the upper limit threshold value in the requirement for the reactive power at the grid-connected point, switching out one or more groups in the capacitor bank. A lower threshold in the requirement for reactive power at the grid-connected point for a fan below reactive power at the grid-connected point indicates that reactive power is absent at the grid-connected point for the fan, and an upper threshold in the requirement for reactive power at the grid-connected point for the fan above indicates that reactive power is redundant at the grid-connected point for the fan.
For example, assuming that the requirement for reactive power at the grid-connected point (i.e., the reactive dead zone) is-40 kvar to +40kvar, the lower threshold and the upper threshold of the requirement for reactive power at the grid-connected point are-40 kvar and +40kvar, respectively. If the reactive power at the grid-connected point of the fan is lower than-40 kvar, the reactive power at the grid-connected point of the fan is lack, and therefore one or more groups of the capacitor banks can be input to perform reactive compensation; if the reactive power at the grid-tie point of the wind turbine is higher than +40kvar, this means that the reactive power at the grid-tie point of the wind turbine is redundant, and therefore one or more of the capacitor banks can be switched out.
In some embodiments, in S108, if it is determined that the reactive power at the grid-tie point of the wind turbine does not satisfy the duration of the requirement for the reactive power at the grid-tie point is equal to or greater than the predetermined threshold, one or more of the capacitor banks may be switched in or out further based on: if the reactive power at the grid-connected point of the fan is lower than a lower limit threshold value in the requirement for the reactive power at the grid-connected point, firstly determining the number of unused capacitor banks in the capacitor banks, when the number is more than or equal to 1, continuously calculating the value of the reactive power to be compensated, and selecting one or more groups of capacitor banks with the capacity closer to the value of the reactive power to be compensated from the unused capacitor banks for use to perform reactive power compensation based on the value and the capacity of the unused capacitor banks; if the reactive power at the grid-connected point of the fan is higher than the upper limit threshold value in the requirement for the reactive power at the grid-connected point, the number of the capacitor banks put into use in the capacitor banks is determined firstly, when the number is larger than or equal to 1, the numerical value of the redundant reactive power needs to be calculated continuously, and one or more groups of capacitor banks with the capacity closer to the numerical value of the redundant reactive power are selected from the capacitor banks put into use to be switched out based on the numerical value and the capacity of the capacitor banks put into use.
In some embodiments, the process from the detection of insufficient reactive power or redundancy to the corresponding switching action of the SVC does not need to be very fast (1 second level), and meanwhile, in order to avoid the problems of sudden reduction of service life and the like of capacitor banks, thyristors and other vulnerable parts caused by frequent switching, the time intervals of the switching actions of the same or different capacitor banks can be set so as to reduce the action times and protect the vulnerable parts. For example, an SVC may have the following five capacitor banks: 20kVar, 40kVar, 80kVar and 160 kVar. For example, the switching time interval of different groups of capacitor banks may be set to 20s, the same group of capacitor bank switching time interval may be set to 120s, and the same group of capacitor bank switching time interval may be set to 5s, so that the switching times of each group of capacitor banks are as the same as possible. When the time intervals of the switching actions of the same group and different groups of capacitor banks are set, the principle of average few actions can be adopted, particularly, two groups of 80kVar capacitor banks can be considered independently to avoid the situation that the capacitor banks are thick and thin, and therefore the two groups of capacitor banks can work equally. Through setting up the switching time interval of the same group of and different groups of capacitor banks, can reduce the breakage rate of vulnerable part, increase of service life reduces the maintenance rate to save considerable human cost and economic burden for the owner.
The control strategy involved in the control method described above with respect to S102-S108 may represent an automatic operation control strategy or a main control strategy of the SVC, which is applied to the normal autonomous operation stage of the SVC.
In some embodiments, before S102, that is, before the SVC automatic operation control strategy, the control method 100 may further include: when the grid-connected point of the fan has no fault, the switching test is carried out on the capacitor bank of the SVC, and the manual operation control strategy of the SVC can be expressed. The SVC manual operation control strategy is mainly applied to the manual debugging stage of the SVC. In some embodiments, before the SVC operates autonomously, it may be manually tested whether all capacitor banks of the SVC can be accurately switched on command. In some embodiments, when there is no fault at the grid-connected point of the wind turbine, a switching test may be performed on the capacitor bank of the SVC one by one to check whether the control program is correct, whether the driver is accurately enabled, and whether the capacitor bank is damaged. In some embodiments, after the manual test confirms that there is no problem in each aspect, i.e. after the manual test is passed, the operation mode knob of the SVC can be switched to the "automatic" operation direction, and the SVC can initiate the automatic operation control strategy.
In some embodiments, before the manual operation of the control strategy of the SVC, i.e. before the manual test, the control method may further include: judging whether the grid-connected point has a fault, and when the grid-connected point has the fault: the SVC is stopped emergently or stopped in a delayed way; and restoring the operation of the SVC after the failure is cleared. In some embodiments, before manual testing, it may be determined whether a fault (e.g., voltage imbalance, current imbalance, abnormal temperature of the SVC cabinet, over-current, over-voltage, etc.) is present at the outlet of the wind turbine. When the fan outlet is determined to be fault-free, the manual operation control stage can be entered or the automatic operation control stage can be directly entered. If the fan outlet fails, whether emergency shutdown is needed or not can be judged, and if the emergency shutdown is needed, the operation of the SVC needs to be manually recovered after the failure is eliminated (for example, the temperature is reduced to the allowable temperature range); if the emergency shutdown is not needed, the SVC can also be stopped in a delayed mode, and after the fault is eliminated, the SVC can automatically recover to operate. In some embodiments, as described above, before entering the manual/automatic operation control phase, it may first be determined whether there is a fault at the fan outlet, and the manual/automatic operation control phase is entered if it is determined that there is no fault, which may represent the overall operation control strategy of the SVC.
In some embodiments, after the SVC controller receives the signal to start the operation of the fan, the SVC side may start the operation, and then may determine whether there is a fault at the fan outlet and enter the manual/automatic operation control phase if it is determined that there is no fault, as described above. In some embodiments, the SVC controller may determine whether the fan has been started to operate through a high-low level state of the board pin, determine whether the fan is connected to the grid and the SVC has a fault only in the fan start state, and enter a manual/automatic operation control stage in a case where there is no fault or the fault has been eliminated.
According to the control method of the Static Var Compensator (SVC) for the fan, the SVC is used for carrying out reactive power regulation, so that the voltage at a grid-connected point of the fan can be stabilized, the reactive power can be regulated, the power factor is improved, the reactive loss and the overall power consumption of a wind power plant during the operation are reduced, the overall investment and the economic loss are reduced, and the stable and safe operation of a power grid and the fan is ensured. In addition, the switching time interval of the same capacitor bank and different capacitor banks is set, so that the breakage rate of the quick-wear part can be reduced, the service life is prolonged, and the maintenance rate is reduced, thereby saving considerable labor cost and economic burden for an owner.
Fig. 2 shows a schematic block diagram of a control device for a static reactive power compensation arrangement (SVC) for a wind turbine according to an embodiment of the present invention. As shown in fig. 2, the control apparatus 200 for a Static Var Compensation (SVC) of a wind turbine may include: a first determination unit 202, a second determination unit 204, a third determination unit 206, and a switching unit 208.
The first determination unit 202 may be configured to determine whether the power factor at the grid-connected point of the wind turbine satisfies a first predetermined requirement. In some embodiments, reference may be made to the content described above with respect to S102 in the control method 100 of fig. 1 for the operation performed by the first determining unit 202, which is not described herein again.
The second determination unit 204 may be configured to determine whether the reactive power at the grid-tie point meets a second predetermined requirement if the power factor does not meet the first predetermined requirement. In some embodiments, reference may be made to the content of S104 in the control method 100 in fig. 1 above for the operation performed by the second determination unit 204, which is not described herein again.
The third judging unit 206 may be configured to: and if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power not meeting the second preset requirement is greater than or equal to a preset threshold value. In some embodiments, the content of S106 in the control method 100 in fig. 1 above may be referred to for the operation performed by the third determining unit 206, and is not described here again.
The switching unit 208 may be configured to switch one or more of the capacitor banks if the duration is greater than or equal to a predetermined threshold. In some embodiments, reference may be made to the content of S108 in the control method 100 in fig. 1 above regarding the operation performed by the switching unit 208, which is not described herein again.
In some embodiments, the control device 200 for a Static Var Compensation (SVC) of a wind turbine may further comprise a test unit, which may be configured to: and when the grid-connected point of the fan has no fault, performing switching test on the capacitor bank of the SVC. In some embodiments, reference may be made to the relevant contents described above with respect to the manual operation control strategy of the SVC in the control method 100 of fig. 1 with respect to the operation performed by the test unit, which is not described herein again.
In some embodiments, the control apparatus 200 for a Static Var Compensation (SVC) of a wind turbine may further include: a fourth judgment unit configured to: judging whether a grid-connected point has a fault or not; and a fault handling unit configured to: when a fault occurs at a grid-connected point: the SVC is stopped emergently or stopped in a delayed way; and restoring the operation of the SVC after the failure is cleared. In some embodiments, reference may be made to the relevant contents described above for the overall operation control strategy of the SVC in the control method 100 of fig. 1 regarding the operations performed by these units, and details are not described here.
In the control equipment for the Static Var Compensator (SVC) of the fan according to the embodiment of the present invention, by performing reactive power regulation using the SVC, not only can the voltage at the grid-connected point of the fan be stabilized, but also the reactive power can be regulated, the power factor can be improved, the reactive loss and the overall power consumption of the wind farm during the operation can be reduced, the overall investment and the economic loss can be reduced, and thus the stable and safe operation of the grid and the fan can be ensured. In addition, the switching time interval of the same capacitor bank and different capacitor banks is set, so that the breakage rate of the quick-wear part can be reduced, the service life is prolonged, and the maintenance rate is reduced, thereby saving considerable labor cost and economic burden for an owner.
The operation effect of the technical scheme of the invention is described by taking two fans which are transformed and upgraded on a certain new energy wind power plant site in south China (namely, the fans which use the control method and the equipment for the Static Var Compensator (SVC) of the fans according to the embodiment of the invention) as an example. Aiming at the two fans which are transformed and upgraded, the operation effect is tested under the conditions that the wind speed is high and the fans are in a high-power state and the wind speed is low and the fans are in a low-power state respectively. The operation result shows that the capacitor bank of the SVC is normally switched automatically, which shows that the controller is stably operated, and the inrush current is less than 1.5 times of rated current, which ensures that the whole operation process of the SVC is not damaged by the impact of large current. Since the new energy wind power plant originally has no centralized reactive power compensation device, the requirement that owners hope to perform reactive power compensation on the fan is met by using the control method and the control equipment of the Static Var Compensation (SVC) device for the fan according to the embodiment of the invention. Furthermore, the power factor is met within a range of ± 0.99, which ensures that no penalty like fines are encountered when the grid looks at reactive power requirements.
The control method 100 for a static reactive power compensation device (SVC) of a wind turbine and at least a part of the control apparatus 200 for a static reactive power compensation device SVC of a wind turbine described in connection with fig. 1 to 2 may be implemented by a computing apparatus. Fig. 3 shows a block diagram of an exemplary hardware architecture of a computing device capable of implementing at least part of the control method and device for a static reactive power compensation arrangement SVC for a wind turbine according to an embodiment of the present invention. As shown in fig. 3, computing device 300 may include an input device 301, an input interface 302, a central processor 303, a memory 304, an output interface 305, and an output device 306. The input interface 302, the central processor 303, the memory 304, and the output interface 305 are connected to each other via a bus 310, and the input device 301 and the output device 306 are connected to the bus 310 via the input interface 302 and the output interface 305, respectively, and further connected to other components of the computing device 300. Specifically, the input device 301 receives input information from the outside and transmits the input information to the central processor 303 through the input interface 302; central processor 303 processes the input information based on computer-executable instructions stored in memory 304 to generate output information, stores the output information temporarily or permanently in memory 304, and then transmits the output information to output device 306 through output interface 305; the output device 306 outputs the output information to the outside of the computing device 300.
That is, the control apparatus 200 for a Static Var Compensation (SVC) of a wind turbine shown in fig. 2 may also be implemented to include a memory storing computer-executable instructions; and a processor which, when executing computer executable instructions, may implement the control method 100 for a Static Var Compensation (SVC) of a wind turbine described in connection with fig. 1.
It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions or change the order between the steps after comprehending the spirit of the present invention.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the above-described device may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electrical, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the elements of the embodiments may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A control method for a Static Var Compensator (SVC) for a wind turbine, comprising:
judging whether the power factor of the fan at the grid-connected point meets a first preset requirement or not, wherein the first preset requirement comprises a grid-connected point power factor threshold range;
if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not, wherein the second preset requirement comprises a grid-connected point reactive power threshold range;
if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and
and switching one or more groups of the capacitor groups if the duration is greater than or equal to the preset threshold.
2. The method of claim 1, wherein prior to determining whether the power factor at the grid tie point of the wind turbine meets a first predetermined requirement, the method further comprises:
and when the grid-connected point of the fan has no fault, performing switching test on the capacitor bank of the SVC.
3. The method of claim 2, wherein prior to performing a switching test on the capacitor bank of the SVC, the method further comprises:
judging whether the grid-connected point has a fault or not; and
when the grid-connected point has a fault:
the SVC is stopped emergently or stopped in a delayed way; and
and restoring the operation of the SVC after the fault is eliminated.
4. The control method of claim 1, wherein one or more of the switched capacitor banks comprises:
if the reactive power is below a lower threshold in the second predetermined requirement, dropping one or more of the capacitor banks; and
switching out one or more of the capacitor banks if the reactive power is above an upper threshold in the second predetermined requirement.
5. The control method of claim 1, wherein one or more of the switched capacitor banks comprises:
if the reactive power is below a lower threshold in the second predetermined requirement:
determining a first number of unused ones of the capacitor banks;
when the first number is more than or equal to 1, calculating a first numerical value of the reactive power to be compensated; and
investing one or more of the unused capacitor banks based on the first value and the capacity of the unused capacitor banks;
if the reactive power is higher than an upper threshold in the second predetermined requirement:
determining a second number of capacitor banks to be placed in service among the capacitor banks;
when the second number is larger than or equal to 1, calculating a second value of redundant reactive power; and
one or more of the capacitors in use are switched out based on the second value and the capacity of the capacitors in use.
6. A control apparatus for a static var power compensation (SVC) of a wind turbine, comprising:
a first judgment unit configured to: judging whether the power factor of the fan at the grid-connected point meets a first preset requirement or not, wherein the first preset requirement comprises a grid-connected point power factor threshold range;
a second determination unit configured to: if the power factor does not meet the first preset requirement, judging whether the reactive power at the grid-connected point meets a second preset requirement or not, wherein the second preset requirement comprises a grid-connected point reactive power threshold range;
a third judgment unit configured to: if the reactive power does not meet the second preset requirement, judging whether the duration time of the reactive power which does not meet the second preset requirement is greater than or equal to a preset threshold value; and
a switching unit configured to: and switching one or more groups of the capacitor groups if the duration is greater than or equal to the preset threshold.
7. The apparatus of claim 6, further comprising:
a test unit configured to: and when the grid-connected point of the fan has no fault, performing switching test on the capacitor bank of the SVC.
8. The apparatus of claim 7, further comprising:
a fourth judgment unit configured to: judging whether the grid-connected point has a fault or not; and
a fault handling unit configured to: when the grid-connected point has a fault:
the SVC is stopped emergently or stopped in a delayed way; and
and restoring the operation of the SVC after the fault is eliminated.
9. The apparatus of claim 6, wherein the switching unit is further configured to:
if the reactive power is below a lower threshold in the second predetermined requirement, dropping one or more of the capacitor banks; and
switching out one or more of the capacitor banks if the reactive power is above an upper threshold in the second predetermined requirement.
10. The apparatus of claim 6, wherein the switching unit is further configured to:
if the reactive power is below a lower threshold in the second predetermined requirement:
determining a first number of unused ones of the capacitor banks;
when the first number is more than or equal to 1, calculating a first numerical value of the reactive power to be compensated; and
investing one or more of the unused capacitor banks based on the first value and the capacity of the unused capacitor banks;
if the reactive power is higher than an upper threshold in the second predetermined requirement:
determining a second number of capacitor banks to be placed in service among the capacitor banks;
when the second number is larger than or equal to 1, calculating a second value of redundant reactive power; and
one or more of the capacitors in use are switched out based on the second value and the capacity of the capacitors in use.
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| CN112491062B (en) * | 2020-12-08 | 2021-11-02 | 埃特罗斯(天津)电气科技有限公司 | Reactive power compensation method and reactive compensation intelligent monitoring system |
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