CN110707759B - Safety and stability control method for wind power high-proportion power grid - Google Patents
Safety and stability control method for wind power high-proportion power grid Download PDFInfo
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- CN110707759B CN110707759B CN201911082498.XA CN201911082498A CN110707759B CN 110707759 B CN110707759 B CN 110707759B CN 201911082498 A CN201911082498 A CN 201911082498A CN 110707759 B CN110707759 B CN 110707759B
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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
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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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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Abstract
The disclosure relates to a safety and stability control method for a wind power high-proportion power grid, which is applied to a safety and stability control system comprising a plurality of main stations and execution stations supporting information sharing, and comprises the following steps: acquiring designated wind power capacity information and power grid operation condition information reported by an execution station; obtaining fault information according to the power grid operation condition information; obtaining a control command of the wind-cutting capacity according to the fault information and the specified wind power capacity information; and sending a control command of the wind-cutting-required capacitance. Through the embodiment of the disclosure, information sharing of the master station and the execution station can be realized, coordination control efficiency among regional power grids can be improved, and difficulty of channel organization and influence of communication channel abnormity on operation of the stability control system can be reduced.
Description
Technical Field
The disclosure relates to the technical field of power electronics, in particular to a safety and stability control method for a wind power high-proportion power grid.
Background
A conventional large-scale power grid stability control system is generally designed according to a three-layer architecture of a main station, a sub station and an execution station, and information exchange is not carried out between the sub station and other sub stations and between the execution station and other execution stations. Due to the characteristic that wind power of a wind power high-proportion power grid is connected and dispersed, the channel organization of the stability control system is difficult abnormally, and higher requirements are put forward on the reliability of communication transmission; the number of stable control stations of the wind power high-proportion power grid and the complexity of a control strategy are far beyond those of a traditional power grid, if a conventional stable control system configuration scheme is adopted, the substation needs to be forwarded by the main station when controlling wind fields under the jurisdiction of other substations, the execution time of a control command is increased, and the effectiveness of control measures of the stable control system is reduced.
Disclosure of Invention
In view of the above, the present disclosure provides a safety and stability control method for a wind power high-proportion power grid.
According to one aspect of the disclosure, a wind power high-proportion power grid safety and stability control method is provided, which is applied to a safety and stability control system including a plurality of master stations and execution stations supporting information sharing, and the method includes:
acquiring designated wind power capacity information and power grid operation condition information reported by an execution station;
obtaining fault information according to the power grid operation condition information;
obtaining a control command of the wind-cutting capacity according to the fault information and the specified wind power capacity information;
and sending a control command of the wind-cutting-required capacitance.
In a possible implementation manner, the control command of the wind-cutting capacity is obtained according to the fault information and the specified wind power capacity information; the method comprises the following steps:
matching corresponding power gears according to the fault information;
under the condition that the power gear meets the power fixed value, obtaining total required cutting power according to the cutting machine proportionality coefficient;
determining wind power selection and cutting range and selection and cutting sequence information according to the total required cutting power and the cutting machine priority table;
and obtaining a control command of the wind power capacity to be cut according to the wind power selection and cutting range and the selection and cutting sequence information.
In a possible implementation manner, the determining wind power selective cutting range and selective cutting sequence information according to the total required cutting power and the cutting machine priority table includes:
determining a wind power selection cutting range according to the setting value of each execution station in the cutting machine priority table;
determining selection and switching sequence information according to the preset priority of each execution station within the wind power selection and switching range; or determining the selection and switching sequence information according to the weight coefficient of each execution station.
In a possible implementation manner, the acquiring specified wind power capacity information and power grid operating condition information reported by the execution station includes: the master station acquires the designated wind power capacity information and the power grid operation condition information acquired by other subordinate execution stations through at least two paths;
the sending of the control command of the wind-cutting-required capacitance comprises the following steps: the main station sends control commands of the capacity needing to cut wind to other main stations through at least two paths.
In a possible implementation manner, the sending the control command of the wind cut-off capacity includes:
the control command of the wind cutting capacity is not needed to be updated within a first preset time, and the main station withdraws the control command of the wind cutting capacity; and/or the presence of a gas in the gas,
and if the wind-cutting-required capacity is not increased within the second preset time, the main station withdraws the control command of the wind-cutting-required capacity.
In a possible implementation manner, the obtaining a control command of the wind cutting capacity according to the fault information and the specified wind power capacity information includes:
and setting a corresponding fault strategy code for each fault according to the fault information, and adding the fault strategy code into a message of a control command of the wind-cut capacity.
In a possible implementation manner, the acquiring specified wind power capacity information and power grid operating condition information reported by the execution station includes: the method comprises the following steps that a master station receives a communication message which carries a source address and a destination address and is reported by an execution station under the jurisdiction of the master station, wherein the communication message comprises: and specifying wind power capacity information and power grid operation condition information.
According to another aspect of the present disclosure, there is provided a wind power high proportion power grid safety and stability control system, the system including: the system comprises a plurality of master stations supporting information sharing, wherein each master station is connected with one or more execution stations;
the main station is used for executing the method to obtain a control command of the wind cutting capacity;
the execution station is used for reporting the specified wind power capacity information and the power grid operation condition information to the main station; and receiving the control command of the capacitance needing to cut the wind and executing the cutting machine processing.
In a possible implementation manner, the plurality of master stations supporting information sharing are connected through a ring, so that a ring architecture is obtained.
According to another aspect of the present disclosure, a wind power high proportion electric network safety and stability control device is provided, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the above method.
According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the above-described method.
By adopting the safe and stable control method for the wind power high-proportion power grid, the annular architecture design is adopted, the information sharing of the master station and the execution station is realized, the coordination control efficiency among the power grids in each area can be improved, and the difficulty of channel organization and the influence of communication channel abnormity on the operation of the stable control system can be reduced.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 shows a flow chart of a wind power high proportion grid safety and stability control method according to an embodiment of the present disclosure;
fig. 2 shows a schematic structural diagram of a wind power high-proportion power grid safety and stability control system according to an embodiment of the present disclosure;
fig. 3 illustrates a schematic diagram of an access exception of an execution station channel in the stability control system according to an embodiment of the present disclosure;
FIG. 4 shows a flow chart of a wind power high proportion grid safety and stability control method according to an embodiment of the present disclosure;
FIG. 5 shows a flow chart of a method for controlling safety and stability of a wind power high proportion power grid according to an embodiment of the present disclosure;
fig. 6 shows a block diagram of a wind power high proportion grid safety and stability control device according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
A conventional large-scale power grid stability control system is generally designed according to a three-layer architecture of a main station, a sub-station and an execution station, wherein the main station mainly realizes emergency control related to a large-area interconnection line, the sub-station mainly realizes the stability problem in a regional power grid, the execution station mainly executes control commands such as load shedding, load shedding and the like sent by a superior sub-station, and the sub-station does not exchange information with other sub-stations and the execution station does not exchange information with other execution stations.
However, due to the characteristic that wind power access of a wind power high-proportion power grid is scattered, channel organization of a stability control system is difficult abnormally, and higher requirements are put forward on the reliability of communication transmission; the number of stable control stations and the complexity of a control strategy of the wind power high-proportion power grid are far beyond those of the traditional power grid, coordination control is needed among power grids in each region, and if a conventional stable control system configuration scheme is adopted, a substation needs to transmit through a main station when needing to control the wind field of other substations, so that the execution time of a control command is increased and the effectiveness of control processing of the stable control system is reduced.
Therefore, the embodiment of the disclosure can realize safe and stable control of the wind power high-proportion power grid based on the annular framework, and can realize information sharing through the annular framework, thereby improving coordination control efficiency among the power grids in each region, and reducing difficulty of channel organization and influence of communication channel abnormity on operation of the stable control system.
Fig. 1 shows a flowchart of a method for controlling safety and stability of a wind power high-proportion power grid according to an embodiment of the present disclosure. The method is applied to a safety and stability control system comprising a plurality of main stations supporting information sharing and executive stations, and as shown in fig. 1, the method can comprise the following steps:
step S10, acquiring the designated wind power capacity information and the power grid operation condition information reported by the execution station;
step S20, obtaining fault information according to the power grid operation condition information;
step S30, obtaining a control command of the wind cutting capacity according to the fault information and the specified wind power capacity information;
and step S40, sending the control command of the wind cutting capacity.
The wind power high-proportion power grid safety and stability control system (stability control system) can be expressed as follows: when the wind power high-proportion power grid is in an emergency state, the power grid is recovered to a control system in a normal operation state by executing various control processes. The stability control system in the embodiment of the present disclosure is designed according to a dual-layer architecture of a master station and an execution station, and may include: the system comprises an execution station and a main station, wherein the execution station can be arranged in a wind power collection substation or a wind power plant, can be used for acquiring power grid information of the wind power grid-connected line or the wind power plant, such as operation condition information, data information, switchable wind power information and the like, and can report the acquired information to the main station. The master station can be arranged in the hub transformer substation or a wind power plant at the same position as the hub transformer substation, and can collect the information reported by each execution station, and control the execution stations to adopt load shedding, cutter cutting and other processing by analyzing and processing the collected information.
The control method in the present disclosure is further explained below by taking an example in which the master station controls the execution station to execute the generator tripping process when the wind power high-proportion power grid fails.
In the embodiment of the present disclosure, the wind power high-proportion power grid safety and stability control system adopts a double-layer architecture of a main station and an execution station, and may include: the system comprises a plurality of master stations supporting information sharing, wherein each master station is connected with one or more execution stations; the main station is used for executing the method in the embodiment to obtain a control command of the wind cutting capacity; the execution station is used for reporting specified wind power capacity information (namely wind cutting capacity information) and power grid operation condition information to the main station; and receiving the control command of the capacitance needing to cut the wind and executing the cutting machine processing. Therefore, the stable control system can improve the coordination control efficiency among the power grids of each region and reduce the difficulty of channel organization and the influence of communication channel abnormity on the operation of the stable control system.
In a possible implementation manner, the plurality of master stations supporting information sharing are connected through a ring, so that a ring architecture is obtained. Illustratively, each master station can adopt 'hand-in-hand' annular connection, so that a plurality of execution stations are connected below each master station in a multi-master-station ring network type architecture design, information sharing of the master stations and the execution stations is realized, and applicability and reliability of the stable control system are improved.
Fig. 2 shows a schematic structural diagram of a wind power high-proportion power grid safety and stability control system according to an embodiment of the present disclosure; as shown in fig. 2, the stability control system includes: the system comprises a first master station A, a second master station B, a third master station C and a fourth master station D, wherein the first master station A, the second master station B, the third master station C and the fourth master station D are sequentially connected in a hand-in-hand ring shape, the first master station A is connected with four executive stations (executive stations A1-A4 in the figure), the second master station B is connected with four executive stations (executive stations B1-B4 in the figure), the third master station C is connected with four executive stations (executive stations C1-C4 in the figure), and the fourth master station D is connected with four executive stations (executive stations D1-D4 in the figure). Each execution station can be arranged in a wind power plant and is used for acquiring information of a wind power supply; it should be noted that, in this embodiment, only four master stations are included in the stability control system, and each master station manages four execution stations respectively, and in actual work, the positions and the numbers of each master station and each execution station may be set as needed, which is not limited herein.
In a possible implementation manner, the acquiring of the specified wind power capacity information and the grid operating condition information reported by the execution station in step S10 may include: the method comprises the following steps that a main station acquires appointed wind power capacity information (wind power capacity information capable of being cut) and power grid operation condition information acquired by execution stations under the jurisdiction of other main stations through at least two paths; the sending of the control command of the wind-cut-off capacity in step S40 may include: the main station sends control commands of the capacity needing to cut wind to other main stations through at least two paths.
For example, in the stability control system in fig. 2, the first master station a, the second master station B, the third master station C, and the fourth master station D may respectively obtain information (such as information of the cutable wind power capacity and information of the operating condition of the power grid) acquired by the execution stations under the jurisdiction of the other three master stations through two paths, so as to implement sharing of the master station information. For example, when the first master station a needs to obtain the switchable wind capacity information of the power source collected by the executive station C1 under the jurisdiction of the third master station C, the third master station C can simultaneously send the information collected by the executive station C1 from the path C- > B- > a and the path C- > D- > a, and any one of the two paths is interrupted, so that the information transmission of the other path is not affected. Meanwhile, the first master station A, the second master station B, the third master station C and the fourth master station D can respectively send control commands (such as control commands for removing subordinate execution stations) needing wind cutting capacity to the other three master stations through two paths. For example, when the first master station a needs to control the executing station C2 under the jurisdiction of the third master station C, the control command may be simultaneously sent to the third master station C through the path a- > B- > C and the path a- > D- > C, and any one of the two paths is interrupted, which does not affect the information transmission of the other path.
In order to effectively identify information (wind power capacity information which can be switched by an execution station under jurisdiction, power grid operation condition information, control commands and the like) sent among the master stations, when each master station sends the information to other master stations, a master station code + information content mode can be adopted, illustratively, information transmission codes contained in a communication message sent among the master stations are shown in table 1, when the master stations receive the information, the master stations can judge which execution station under the master station needs to be controlled through identifying the master station codes, and can also judge which master station under jurisdiction execution station sends the message through identifying the master station codes.
TABLE 1 information transmission code
Therefore, the stability control system effectively improves the reliability of information sharing and command transmission between the main station and other main stations through multi-path data transmission, and reduces the influence of communication faults on the stability control system.
In a possible implementation manner, in step S10, the obtaining of the specified wind power capacity information and the grid operating condition information reported by the execution station may include: the master station receives a communication message carrying a source address and a destination address, which is reported by an execution station under the jurisdiction of the master station, wherein the communication message may include: and specifying wind power capacity information and power grid operation condition information.
Considering that the scale of a wind power high-proportion power grid stability control system is far beyond that of a conventional power grid, usually one master station is required to be connected and communicated with a plurality of subordinate execution stations and receive information sent by the subordinate execution stations, however, usually, a message sent to the master station by each execution station only contains a target address (master station address) but not a source address (local station address), and the situation cannot be detected when a 'Yuanyang line' and 'channel configuration dislocation' occur. For example: fig. 3 is a schematic diagram illustrating an access exception of an executive station channel in a stability control system according to an embodiment of the present disclosure, as shown in fig. 3, an error occurs in a connection channel between a subordinate executive station a1 and an executive station a2 in a first master station a, wherein an executive station a1 interface Rx error in the first master station a is connected to a Tx in an executive station a2, an executive station a2 interface Rx error in the first master station a is connected to a Tx in an executive station a1, so that channel assignment of the executive station a1 and the executive station a2 is caused, and since there is no address code check, the first master station a cannot detect the occurrence of the connection exception, and may take the data error of the executive station a2 as an executive station a1, and the data error of the executive station a1 as data processing of the executive station a2, thereby directly causing an incorrect action result.
According to the method and the device, through a mechanism of performing source address + destination address double verification on the communication message between the master station and the subordinate executive stations thereof, the communication message sent to the subordinate master station from the executive station exemplarily comprises the source address (the address of the executive station) and the destination address (the address of the master station), so that the master station can be effectively and accurately matched with the executive station, the accuracy of accessing the stable control device into a system is ensured, and the situations of 'Yuanyang line', 'channel configuration dislocation' and the like are avoided.
The step of receiving the communication message reported by the execution station under the jurisdiction of the master station may further include: specifying wind power capacity information and power grid operation condition information; the designated wind power capacity information is the wind power capacity information which can be cut of the execution station, and the power grid operation condition information is the operation state information which represents the wind power grid collected by each execution station. For example, the execution station can monitor the running state information of the wind power collecting wire acquired by the execution station in real time, collect the wind power collecting wire in the running state and upload the collected wind power collecting wire to the master station to which the execution station belongs, and the master station can transmit the received information to other master stations in the stability control system; each master station can estimate the state of the power grid according to the collected operation condition information collected by each execution station, such as: determining fault information; and the real-time switchable capacity of the power grid can be obtained according to the summarized switchable wind power capacity information of each execution station, and then a control strategy is executed.
Therefore, the master station and the subordinate execution stations adopt a source and target address dual anti-error checking mechanism for communication, the access system of the stable control equipment is checked, abnormal conditions such as channel configuration dislocation are avoided, and the accuracy of the access system of the stable control equipment is ensured.
In a possible implementation manner, in step S20, fault information is obtained according to the grid operating condition information. The main station analyzes and judges various faults affecting the operation of the power grid according to the real-time received power grid operation condition information collected by each execution station, and further executes a control strategy after determining specific fault information.
In one possible implementation manner, fig. 4 shows a flowchart of a safety and stability control method for a wind power high-proportion power grid according to an embodiment of the present disclosure. As shown in fig. 4, in step S30, the control command of the wind-cut-required capacity is obtained according to the fault information and the specified wind power capacity information; may include the steps of:
s301, matching corresponding power gears according to the fault information;
step S302, under the condition that the power gear meets a power fixed value, obtaining total required cutting power according to a cutting machine proportion coefficient;
step S303, determining wind power selection and cutting range and selection and cutting sequence information according to the total required cutting power and the cutting machine priority table;
and step S304, obtaining a control command of the wind power capacity to be cut according to the wind power selection and cutting range and the selection and cutting sequence information.
Considering the stability control system of the ring network architecture in the embodiment of the present disclosure, a master station may receive control commands of another same master station through at least two paths, for example, in the stability control system in fig. 2, a third master station C may receive a control command sent by a first master station a through a path a- > B- > C and a path a- > D- > C; this requires confirming whether the control command is the same control command, and if it is the same command, it is allowed to be executed only once. In addition, the same fault is simultaneously judged by two main stations, in this case, the control quantity of the two main stations has a certain difference due to the existence of the acquisition error of the local element, and in order to ensure the safety of the power grid, the measure with the maximum control quantity needs to be executed. For example, a first master station A and a second master station B are respectively arranged at substations at two ends of a line and both have the function of judging overload or trip of a certain line, and when the first master station A and the second master station B judge the overload or trip of the line, both need to control a power supply under the jurisdiction of a third master station C; at this time, the third master station C can only execute the control command with the large control amount in the first master station a and the second master station B, for example, when the control command of the first master station a is received first, the processing of the control command is executed first, and after the control command of the second master station B is received again, if the control amount of the second master station B is larger than the control amount of the first master station a, the required wind cut capacity is recalculated, and the difference is added to the required wind cut capacity; and if the control quantity of the second master station B is less than the control quantity of the first master station A, the control command of the second master station B is not executed.
In order to implement the foregoing function, in a possible implementation manner, the obtaining, in step S30, a control command of a wind-cut-required capacity according to the fault information and the specified wind power capacity information may include: and setting a corresponding fault strategy code for each fault according to the fault information, and adding the fault strategy code into a message of a control command of the wind-cut capacity.
Illustratively, each master station sets 1 unique fault policy code for each type of fault which is determined by each master station (i.e. the fault policy codes corresponding to different faults are different), and adds the fault policy codes into the command message. Therefore, after each master station receives a control command message with the unique fault strategy code sent by other master stations, if the master station code in the command message is detected to be consistent with the code set by the fixed value of the master station (each master station in the system sets 1 unique master station code by the fixed value), counting the wind-cutting capacity information of the subordinate execution stations and forwarding the wind-cutting capacity information to the subordinate execution stations; and if the master station code in the command message is detected to be inconsistent with the code set by the current station constant value, forwarding the command to the next master station of the control command transmission path. Further, counting the wind-cutting capacity information of the execution stations under the jurisdiction: if the received fault code is not executed before, executing, and accumulating the capacity needing to cut wind into the capacity needing to cut wind of the corresponding execution station according to the corresponding relation; if the command is executed before and the command of the same fault code is received subsequently, the wind-cut-off required capacity of each execution station in the command message is detected, if the wind-cut-off required capacity of a certain execution station is newly received and is larger than the wind-cut-off required capacity received before, the wind-cut-off required capacity is recalculated, and the difference is added to the wind-cut-off required capacity of the execution station.
Therefore, the fault elements and the fault types are strictly distinguished through the command message, and repeated execution of the same control command (such as the control command of the same fault of the same main station and the control command of the same fault of different main stations) is avoided.
In a possible implementation manner, the determining the wind power selection and cutting range and the selection and cutting sequence information according to the total required cutting power and the cutting machine priority table in step S303 may include: determining a wind power selection cutting range according to the setting value of each execution station in the cutting machine priority table; determining selection and switching sequence information according to the preset priority of each execution station within the wind power selection and switching range; or determining the selection and switching sequence information according to the weight coefficient of each execution station.
The generator tripping priority table can be determined according to the actual state of each execution station in the wind power high-proportion power grid, and the generator tripping priority table contains information of all execution stations in the stability control system, for example, taking the stability control system in fig. 2 as an example, as shown in table 2:
TABLE 2 cutter priority table
| Serial number | Name of definite value | Setting range |
| 1 | Executive station A1 priority | 0～16 |
| 2 | Executive station A2 priority | 0～16 |
| 3 | Executive station A3 priority | 0～16 |
| 4 | Executive station A4 priority | 0～16 |
| 5 | Executive station B1 priority | 0～16 |
| 6 | Executive station B2 priority | 0～16 |
| 7 | Executive station B3 priority | 0～16 |
| 8 | Executive station B4 priority | 0～16 |
| 9 | Executive C1 priority | 0～16 |
| 10 | Executive C2 priority | 0～16 |
| 11 | Executive C3 priority | 0～16 |
| 12 | Executive C4 priority | 0～16 |
| 13 | Executive station D1 priority | 0～16 |
| 14 | Executive station D2 priority | 0～16 |
| 15 | Executive station D3 priority | 0～16 |
| 16 | Executive station D4 priority | 0～16 |
Determining a wind power selection and switching range according to setting values (the setting values are also called set values and represent action parameter set values required by a stability control system to complete a preset protection function obtained through setting calculation and tests) of each execution station in the generator tripping priority table, for example, when the setting value of the corresponding priority of the execution station is not 0, the execution station is in the selection and switching range; when the setting value is 0, the execution station is not switchable and is not in a switchable range. And in the selective cutting range, determining selective cutting sequence information according to the cutting machine priority table.
Further, when determining the selection and switching sequence information, the selection and switching sequence information can be divided into two cases through fixed value setting: and under the condition that all the switchable executive station setting values in the switching machine priority table are the same (for example, the setting value of all the switchable executive station setting values is 9), the executive stations in the selected switching range distribute the total required switching wind capacity according to the output weight: the main station collects the switchable wind power capacity information sent by all the execution stations in the switchable range to obtain the total switchable wind power capacity, the weight coefficient of each execution station is calculated according to the switchable wind power capacity information sent by each execution station, and then the distribution of the wind power capacity to be switched is completed according to the weight coefficient. The wind-cutting-required capacitance distribution calculation formula is as follows:
wherein: dPiCalculating the required wind cutting capacity of the ith switchable executive station; piThe wind power capacity which can be cut and sent on the ith execution station in the selected cutting range is selected; psumThe total required wind cutting capacity is; n is the number of executing stations in the selected cutting range.
Under the condition that the setting values of all the executable stations in the switching machine priority table are not identical, all the executable stations in the selected switching range are switched off one by one according to a preset priority sequence: for example, station-fixed values may be set to 1 for the highest priority, priority round-robin, 16 for the lowest priority, and last round-robin. Firstly, wind power execution stations are selected according to the wind power priority sequence from high to low, and wind power capacity information required to be cut is sent, and only wind power capacity (total wind power capacity required to be cut-wind power capacity) required to be cut is sent to an execution station until an over-cut condition occurs after a certain wind power execution station is completely cut.
In a possible implementation manner, the sending the control command of the wind cut-off capacity in step S40 may include: the control command of the wind cutting capacity is not needed to be updated within a first preset time, and the main station withdraws the control command of the wind cutting capacity; and/or if the wind-cutting-required capacity is not increased within a second preset time, the main station withdraws the control command of the wind-cutting-required capacity. The first preset time and the second preset time may be the same or different, and the specific value may be set according to an actual power grid stability control strategy, which is not limited herein.
The control commands between stations in the conventional stability control system all adopt a one-way transmission mode, the transmitted information comprises feature code information, when the feature code is 0x99, the transmitted information is a command message, and when the feature code is 0x55, the transmitted information is a normal message (non-command message), and the specific logic is as follows: 1) when the sending end is stably controlled to be in a starting state, the feature code in the sent message information is set to be 0x99, and when the sending end is in a non-starting state, the feature code in the sent message information is set to be 0x 55; 2) when the receiving end stably controls that the feature code in the received message information is 0x99, the receiving end stably controls the device to start and execute the control command; when the feature code in the received message information is 0x55, if the message information is in the starting state, the whole group is reset and started again after certain delay confirmation.
In the stable control system of the ring network architecture, the master station and the master station can send commands to each other at the same time, the master station can be a sending end and a receiving end at the same time, and if the communication mechanism of the conventional stable control system is still adopted, the master station sending the control commands to each other is always in a starting state, and the normal operation of the master station is influenced finally. For this reason, for the master station apparatus that has the control command to send each other, the following communication mechanism is adopted: when the master station is used as a stable control device of a sending end, when a control command initiated by the master station per se is sent, if no new control command exists within a certain time or the control quantity does not increase within a certain time, the control command is actively withdrawn.
Therefore, by sending commands to the master stations, a sending end time-limited retraction mode is adopted, namely, who sends the commands is responsible for time-limited retraction, and the situation that double sets of abnormal locking are caused because the master stations cannot retract after starting is avoided;
exemplarily, fig. 5 shows a flowchart of a safety and stability control method for a wind power high-proportion power grid according to an embodiment of the present disclosure, as shown in fig. 5, a master station may collect all switchable wind power information collected by a control system, match a policy fixed value of a current operation mode according to a preset policy table (including a power fixed value, a generator-cutting ratio coefficient, and a generator-cutting priority table), and perform policy search to determine fault information after determining that various faults affecting the operation of the power grid occur; the method comprises the steps of customizing and matching relevant power gears according to preset power in a fault type and a strategy table, calculating total required switching power according to preset switching machine proportion coefficients if the corresponding power gears are met, finding a corresponding switching machine priority table to determine a wind power switching range and a switching sequence, further performing wind power switching until the total required switching power is met, generating a control command of the capacity required to be switched, sending the control command of the capacity required to be switched to a corresponding execution station by a main station (transmitting the control commands of execution stations under the jurisdiction of other main stations through the corresponding main station), receiving and executing the control command of the capacity required to be switched by the main station by the execution station, and performing the switching according to wind power collecting line priority levels preset locally by the execution station, namely selecting and switching wind power from high to low according to wind power priority order sequencing until the power is over-switched.
It should be noted that, although the wind power high proportion power grid safety and stability control method is described above by taking the above embodiment as an example, those skilled in the art can understand that the disclosure should not be limited thereto. In fact, the user can flexibly set each implementation mode according to personal preference and/or actual application scene, as long as the technical scheme of the disclosure is met.
Thus, by adopting the 'hand-in-hand' annular architecture design, the wind power high-proportion power grid safety and stability control method of the embodiment of the disclosure realizes information sharing of the master station and the execution station, can improve coordination control efficiency among power grids in each area, and can reduce difficulty of channel organization and influence of communication channel abnormity on operation of a stability control system; the reliability of information transmission between the main station and other main stations is improved by utilizing multi-path data transmission and multi-check of information between the stations; by strictly distinguishing fault elements and fault types, the repeated execution of the same control command is avoided; the master stations send commands to each other, and a time-limited retraction mode of the sending end is adopted, so that the situation that double sets of abnormal locking is caused because the master stations cannot retract after being started is effectively avoided; and the accuracy of accessing the stable control equipment to the system is ensured by using a dual anti-error checking mechanism of the source and the target addresses of the communication between stations.
Fig. 6 shows a block diagram of a wind power high proportion grid safety and stability control device 1900 according to an embodiment of the present disclosure. For example, the apparatus 1900 may be provided as a server. Referring to FIG. 6, the device 1900 includes a processing component 1922 further including one or more processors and memory resources, represented by memory 1932, for storing instructions, e.g., applications, executable by the processing component 1922. The application programs stored in memory 1932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 1922 is configured to execute instructions to perform the above-described method.
The device 1900 may also include a power component 1926 configured to perform power management of the device 1900, a wired or wireless network interface 1950 configured to connect the device 1900 to a network, and an input/output (I/O) interface 1958. The device 1900 may operate based on an operating system stored in memory 1932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.
In an exemplary embodiment, a non-transitory computer readable storage medium, such as the memory 1932, is also provided that includes computer program instructions executable by the processing component 1922 of the apparatus 1900 to perform the above-described methods.
The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A safety and stability control method for a wind power high-proportion power grid is characterized by being applied to a safety and stability control system comprising a plurality of main stations and execution stations supporting information sharing, and the method comprises the following steps:
acquiring designated wind power capacity information and power grid operation condition information reported by an execution station;
obtaining fault information according to the power grid operation condition information;
obtaining a control command of the wind-cutting capacity according to the fault information and the specified wind power capacity information;
sending a control command of the wind cutting capacity;
obtaining a control command of the wind cutting capacity required according to the fault information and the specified wind power capacity information; the method comprises the following steps:
matching corresponding power gears according to the fault information;
under the condition that the power gear meets the power fixed value, obtaining total required cutting power according to the cutting machine proportionality coefficient;
determining wind power selection and cutting range and selection and cutting sequence information according to the total required cutting power and the cutting machine priority table;
and obtaining a control command of the wind power capacity to be cut according to the wind power selection and cutting range and the selection and cutting sequence information.
2. The method of claim 1, wherein the determining wind power selective switching range and selective switching sequence information according to the total required switching power and the switching machine priority table comprises:
determining a wind power selection cutting range according to the setting value of each execution station in the cutting machine priority table;
determining selection and switching sequence information according to the preset priority of each execution station within the wind power selection and switching range; or determining the selection and switching sequence information according to the weight coefficient of each execution station.
3. The method of claim 1, wherein the obtaining of the designated wind power capacity information and the grid operating condition information reported by the execution station comprises: the master station acquires the designated wind power capacity information and the power grid operation condition information acquired by other subordinate execution stations through at least two paths;
the sending of the control command of the wind-cutting-required capacitance comprises the following steps: the main station sends control commands of the capacity needing to cut wind to other main stations through at least two paths.
4. The method of claim 1, wherein said sending control commands for said wind cut-off capacity comprises:
the control command of the wind cutting capacity is not needed to be updated within a first preset time, and the main station withdraws the control command of the wind cutting capacity; and/or the presence of a gas in the gas,
and if the wind-cutting-required capacity is not increased within the second preset time, the main station withdraws the control command of the wind-cutting-required capacity.
5. The method according to claim 1, wherein the obtaining of the control command of the wind-cut-required capacity according to the fault information and the specified wind power capacity information comprises:
and setting a corresponding fault strategy code for each fault according to the fault information, and adding the fault strategy code into a message of a control command of the wind-cut capacity.
6. The method of claim 1, wherein the obtaining of the designated wind power capacity information and the grid operating condition information reported by the execution station comprises: the method comprises the following steps that a master station receives a communication message which carries a source address and a destination address and is reported by an execution station under the jurisdiction of the master station, wherein the communication message comprises: and specifying wind power capacity information and power grid operation condition information.
7. The utility model provides a wind-powered electricity generation high proportion electric wire netting safety and stability control system which characterized in that, the system includes: the system comprises a plurality of master stations supporting information sharing, wherein each master station is connected with one or more execution stations;
the master station is used for executing the method of any one of claims 1 to 6 and obtaining a control command of the wind cutting capacity;
the execution station is used for reporting the specified wind power capacity information and the power grid operation condition information to the main station; and receiving the control command of the capacitance needing to cut the wind and executing the cutting machine processing.
8. The system of claim 7, wherein the plurality of primary stations supporting information sharing are connected in a ring to obtain a ring architecture.
9. The utility model provides a wind-powered electricity generation high proportion electric wire netting safety and stability controlling means which characterized in that includes:
a processor;
a memory for storing processor-executable instructions;
wherein the processor implements the method of any one of claims 1-6 by invoking the executable instructions.
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| CN108767856A (en) * | 2018-06-27 | 2018-11-06 | 广东电网有限责任公司 | A kind of general stabilized control system and its control method |
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| CN108767856A (en) * | 2018-06-27 | 2018-11-06 | 广东电网有限责任公司 | A kind of general stabilized control system and its control method |
| CN109802388A (en) * | 2019-03-12 | 2019-05-24 | 国家电网公司东北分部 | The accurate fast prosecutor method of power grid based on virtual substation technology |
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