Secondary system auxiliary decision method and system based on system protection fault scene

Abstract

The application provides a primary and secondary system auxiliary decision-making method based on a system protection fault scene, comprising the following steps: obtaining a communication channel existing fault from a database, and storing the communication fault and the device fault into a power system protection typical fault scene library; matching and checking the power system protection typical fault scene with a power system expected fault scene, and judging whether the risk of the power system protection typical fault scene is acceptable; if the risk of the power system protection typical fault scene is not acceptable, then reselecting other routing paths through the secondary side system; if a suitable other routing path cannot be selected, then adjusting an emergency control strategy through the secondary side system to find a new feasible strategy; if the new feasible strategy cannot be found, then adjusting an auxiliary decision-making through the primary side system until the risk is acceptable, and the application realizes the effective cooperation between the primary and secondary systems for the auxiliary decision-making and improves the protection capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system protection, and particularly relates to a primary and secondary system auxiliary decision-making method and system based on a system protection fault scene. BACKGROUND

[0002] With the rapid development of the UHV cross-region interconnected power grid and the wide application of a large number of power electronic devices, the safety and stability characteristics of the power grid are becoming more and more complex, and the safe operation risk is increasing. In order to further adapt to the situation of the power grid, in recent years, State Grid Corporation of China has proposed to build a safety comprehensive defense system of the large power grid, that is, the requirement of "system protection". The system protection is an emergency control system based on wide-area information collection, rapid fault diagnosis and isolation, and multi-resource cooperation, and covers many sites and has a complex coupling relationship between device strategies. Meanwhile, due to the limitation of control resources, the cross-configuration between strategies gradually increases, and the influence range of local abnormalities of the system is getting larger. The complexity and hidden dangers significantly increase the operation risk of the power grid.

[0003] When the system protection fails, the decision-making or execution ability of the whole control system is greatly weakened. In order to ensure that the system protection does not lose the defense capability, or to reduce the risk of safe and stable operation of the power grid caused by the failure of the system protection from the perspective of the cooperation between the primary and secondary systems when it is predicted that the defense capability is insufficient, it is a key point of the research. However, the auxiliary decision-making calculation of the cooperation between the primary and secondary systems needs to quickly perceive the degree of overall failure caused by local faults, and quickly give effective decisions from the adjustment space such as the mode switching or topological transformation of the secondary system and the mode change of the primary system, which involves a heterogeneous multi-variable mixed optimization problem, and it is difficult to analyze and solve by using the conventional mathematical method. In the prior art, when the power system protection fails, it is difficult to make auxiliary decisions through effective cooperation between the primary and secondary systems. SUMMARY

[0004] The present application provides a primary and secondary system auxiliary decision-making method and system based on a system protection fault scene, which is used to solve the defect that the defense capability is weakened when the existing power system protection fails, realize the effective cooperation between the primary and secondary systems for auxiliary decision-making, and improve the protection capability.

[0005] The present application provides a primary and secondary system auxiliary decision-making method based on a system protection fault scene, comprising:

[0006] Obtain the fault existing in the communication channel from the database, and store the communication fault and the device fault into a power system protection typical fault scene library;

[0007] Match and verify the power system protection typical fault scene with the power system expected fault scene, and determine whether the risk of the power system protection typical fault scene is acceptable;

[0008] If the risk of the typical fault scene of the power system protection is unacceptable, then other routing paths are selected by re-routing through the secondary side system;

[0009] If no other suitable routing path can be selected, then an emergency control strategy adjustment is made through the secondary side system to find a new feasible strategy;

[0010] If no new feasible strategy can be found, then an auxiliary decision adjustment is made through the primary side system to change the power generation unit output value of the power system until the risk of the typical fault scene of the power system protection is acceptable.

[0011] According to the one-two system auxiliary decision method based on the system protection fault scene provided by the application, if the risk of the typical fault scene of the power system protection is unacceptable, then other routing paths are selected by re-routing through the secondary side system, which specifically comprises:

[0012] For the original power system protection structure and control function, under the typical fault scene of the power system protection, available control routing paths are re-selected, and an available control routing path searching model is established.

[0013] According to the one-two system auxiliary decision method based on the system protection fault scene provided by the application, the available control routing path searching model is established, and the specific expression is:

[0014]

[0015]

[0016]

[0017]

[0018] The available control routing path searching model is a 0-1 integer programming, C S is an available master station, C e is an available execution station, N r represents an available intermediate node, indicates whether different services pass through the link mn, and is 1 if they do; the objective function represented by formula (1) is the shortest routing, mn represents a communication link, and k represents a service.

[0019] According to the one-two system auxiliary decision method based on the system protection fault scene provided by the application, if no suitable other routing path can be selected, then an emergency control strategy adjustment is made through the secondary side system to find a new feasible strategy, which specifically comprises:

[0020] When the original strategy cannot be executed by finding a suitable alternative route, other alternative measures are taken to adjust the real-time optimization model expression of the alternative strategy:

[0021]

[0022] f(P G1 ,P G2 ,…;P L1 ,P L2 ,…)≥ε (6)

[0023] x i ,c Gi ,y j ,c Lj =0 or 1(i=1,…n G ;j=1,…n L ) (7)

[0024] The objective function is to minimize the total load shedding amount, formula (6) represents that the system satisfies the transient stability constraint after load shedding, formula (7) represents the serial number of different cuttable units or loads, x i and y j represent load shedding variables, c Gi and c Lj represent the available states of the load shedding execution station, which depend on the current system protection fault scene, and the availability of the execution station is different under different fault scenes.

[0025] According to the one-two system auxiliary decision-making method based on a system protection fault scene provided by the application, if a new feasible strategy cannot be found, the primary system is used for auxiliary decision-making adjustment to change the generator output value of the power system until the risk of the power system protection typical fault scene is acceptable, and specifically includes:

[0026] When no other route alternative strategy can be found, the primary system and the secondary system are combined to adjust the generator output through double-layer optimization;

[0027] The double-layer optimization includes an upper layer objective function and a lower layer objective function, the upper layer objective function calculates the cost loss caused by the preventive control adjustment of the generator output and the cost loss caused by the unreliability of the communication line to the physical system;

[0028] The lower layer objective function calculates the risk value of the power adjustment business transmitted by the communication system.

[0029] According to the one-two system auxiliary decision-making method based on a system protection fault scene provided by the application, the upper layer objective function includes:

[0030] When the power adjustment of the generator is measured by a segment function due to the loss caused by the communication route interruption, the generator output adjustment is not needed to be performed when the line flow and the power angle are within the specified range; if the line flow or the power angle is out of limit, the generator output adjustment operation is needed to be performed.

[0031] The application further provides a secondary system assisted decision system for a system protection fault scene, and the system comprises:

[0032] An extension module is configured to acquire the existing fault of the communication channel from the database and store the existing fault of the communication channel into a power system protection typical fault scene library.

[0033] A judgment module is configured to match and verify the power system protection typical fault scene with the power system expected fault scene, and judge whether the risk of the power system protection typical fault scene is acceptable.

[0034] An adjustment module is configured to judge whether the risk of the power system protection typical fault scene is unacceptable, and if so, reselect other routing paths through the secondary system; if no suitable routing path can be selected, an emergency control strategy is adjusted through the secondary system to find a new feasible strategy; if no new feasible strategy can be found, the primary system is combined for adjustment to assist in decision making, and the power system generator output value is changed until the risk of the power system protection typical fault scene is acceptable.

[0035] The application further provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor implements the secondary system assisted decision method based on the system protection fault scene as described above when executing the program.

[0036] The application further provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executable on the processor to implement the secondary system assisted decision method based on the system protection fault scene as described above.

[0037] The application further provides a computer program product, which comprises a computer program, and the computer program is executable on the processor to implement the secondary system assisted decision method based on the system protection fault scene as described above.

[0038] The application provides a primary and secondary system auxiliary decision-making method and system based on a system protection fault scene, which judges the risk of a typical fault scene of a power system protection through a secondary side system, selects other routing paths or emergency control strategy adjustment according to different situations, and adopts a primary system adjustment mode to reduce the risk when the secondary system cannot effectively reduce the system risk, so that the cooperation between the primary side system and the secondary side system decision-making is realized, and the protection capability of the overall power system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 It is a flowchart of the primary and secondary system auxiliary decision-making method based on a system protection fault scene provided by the application;

[0041] Figure 2 It is a power angle characteristic curve diagram of the primary and secondary system auxiliary decision-making method based on a system protection fault scene provided by the application;

[0042] Figure 3 It is a module connection diagram of the primary and secondary system auxiliary decision-making system based on a system protection fault scene provided by the application;

[0043] Figure 4 It is a structural diagram of the electronic device provided by the application.

[0044] Reference signs:

[0045] 310: expansion module; 320: judgment module; 330: adjustment module; 410: processor; 420: communication interface; 430: memory; 440: communication bus. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the application more clear, the technical solutions in the application will be clearly and completely described below in combination with the drawings in the application. Obviously, the described embodiments are some embodiments of the application, not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0047] The primary and secondary system auxiliary decision-making method based on a system protection fault scene provided by the application will be described below in combination with Figures 1-2 the drawings in the application.

[0048] Obtain the communication channel existing fault from the database, and store the communication fault and the device fault into the power system protection typical fault scene library; when it is found that the power system expected fault scene risk caused by the system protection typical fault scene is difficult to accept, take adjustment measures to improve, improve the existing scheme, add the fault of the communication system to the typical fault scene library, and make the risk evaluation more comprehensive;

[0049] Match and check the power system protection typical fault scene and the power system expected fault scene, and judge whether the risk of the power system protection typical fault scene is acceptable;

[0050] If the risk of the power system protection typical fault scene is not acceptable, then reselect other routing paths through the secondary side system;

[0051] If the appropriate other routing path cannot be selected, then adjust the emergency control strategy through the secondary side system to find a new feasible strategy; the above is the adjustment strategy of the secondary side system, and when the adjustment strategy of the secondary side system cannot reduce the risk, the primary side system needs to be combined;

[0052] If a new feasible strategy cannot be found, then adjust the auxiliary decision through the primary side system, change the power generation unit output value of the power system, and until the risk of the power system protection typical fault scene is acceptable.

[0053] The power system usually has two control measures and three lines of defense, including: preventive control and emergency control. The preventive control refers to the control performed to improve the adequacy and safety of the power system in the alert state due to some reasons when the power system is normally operated, including generator output control, section power control, load control, reactive power and voltage control, etc. The emergency control refers to the control performed to prevent the system from entering an emergency state or an extreme emergency state due to disturbance, to prevent the system stability from being destroyed, the operating parameters from being seriously out of the specified range, and the accident from further expanding to cause large-scale power outage.

[0054] The three lines of defense of power system aims to reduce the loss caused by power failure through different control means. Before the power failure occurs, the first line of defense of power grid construction planning and operation planning analyzes the power expected failure and takes preventive control measures to improve the ability of power grid to deal with expected failure. After the power failure occurs, the second line of defense of emergency control measures such as relay protection and safety control system quickly removes the fault, load and generator, etc. to ensure that the system integrity and stability are not lost. If the second line of defense cannot restore the system stability or voltage and frequency, the third line of defense of corrective control system implementation will be implemented to minimize the power outage scale and loss. After the third line of defense of corrective control system implementation, the power system is in the state of disconnection, loss of machine and load, so recovery control measures need to be taken to make the system return to normal full load operation state.

[0055] With the development of information technology, not only the definition of three lines of defense exists in power system, but also the corresponding concept exists in information system. The first line of defense of communication information: refers to the measures such as strengthening the planning of communication information network and optimizing the business path to realize the preventive control function of communication information before the failure occurs. The second line of defense of communication information: refers to the emergency control strategies such as network self-healing protection, backup channel fast switching and ring network switching to realize the function of rapid recovery of business path when the communication information failure such as business interruption occurs. The third line of defense of communication information: refers to the corrective control means such as automatic rerouting and emergency communication to ensure the temporary smoothness of business when the short-term failure of interrupted business cannot be solved. Similar to power system, after the implementation of the third line of defense of communication information, the communication information system is in the state of partial information loss and non-optimal performance index, so recovery control measures need to be taken to return to the optimal normal communication state.

[0056] System protection realizes the protection of specific failure of power system under specific operation mode, and the original system protection scheme is the optimal execution strategy of current operation mode verified by simulation, including various measures of cutting machine and load. There are many reasons for the failure of system protection, and the corresponding secondary system adjustment has two ways, which can be realized by communication routing adjustment or power system emergency control strategy adjustment. However, only secondary system adjustment may not effectively realize system stability, so primary system needs to assist in decision-making when necessary.

[0057] In power system, there is an important constraint, i.e. transient stability constraint. In order to ensure that the power system does not occur transient instability after failure, the P-δ curve is used to analyze the transient stability of power system. Figure 2It can be known that the power angle difference of any two units in the power system is generally required to be limited within a certain margin range below 180 degrees, and the power angle difference meeting certain constraints is taken as the transient stability constraint. In engineering, the limit of section power flow is used to ensure the transient stability of the power system, and as long as the section power flow does not exceed the limit value, the transient instability will not occur, and the limit power is called the transient stability limit. The following briefly introduces the method for obtaining the limit.

[0058] The specific implementation steps of the section power flow limit include:

[0059] Determine the energy center and the load center of the existing power system;

[0060] Find the power transmission section between the energy center and the load center, determine that when the section power is within a certain limit value P, the short-circuit fault of a certain line in the section will not cause transient power angle instability, and the power limit value is P, as long as the section power flow is limited below the limit value; if it is an emergency control, the maximum section power reduction measure ΔP that can be taken is considered, and at this time the section operation power limit of the system can be improved to P+ΔP.

[0061] When the risk of the typical fault scene of the power system protection is unacceptable, the other routing paths are re-routed through the secondary system, which specifically includes:

[0062] For the original power system protection structure and control function, under the typical fault scene of the power system protection, the available control routing paths are re-routed, and an available control routing path searching model is established.

[0063] The available control routing path searching model is established, and the specific expression is:

[0064]

[0065]

[0066]

[0067]

[0068] The available control routing path searching model is a 0-1 integer programming, C S is an available master station, C e is an available execution station, N r represents an available intermediate node, indicates whether different services pass through the link mn, and is 1 if they pass through; the objective function route shortest represented by formula 1, mn represents the communication link, k represents the service, and formulas 5, 6 and 7 represent that the in-degree and out-degree of the node are equal.

[0069] The best route is selected by switching other routing paths to reduce the risk.

[0070] If a suitable other routing path cannot be selected, an emergency control strategy adjustment is performed through the secondary side system to find a new feasible strategy, which specifically includes:

[0071] When the original strategy cannot be executed by finding a suitable alternative route, other alternative measures are taken for adjustment, and the real-time optimization model expression of the alternative strategy is:

[0072]

[0073] f(P G1 ,P G2 ,…;P L1 ,P L2 ,…)≥ε (6)

[0074] x i ,c Gi ,y j ,c Lj =0 or 1(i=1,…n G ;j=1,…n L ) (7)

[0075] The objective function is to minimize the total amount of machine and load shedding, formula 6 represents that the system satisfies the transient stability constraint after machine and load shedding, formula 7 represents the serial number of different machine groups or loads that can be cut, x i and y j represent machine and load shedding variables, c Gi and c Lj represent the available state of the machine and load shedding execution station, which depends on the current system protection fault scenario, and the availability of the execution station is different under different fault scenarios.

[0076] By selecting and switching other routing paths and emergency control strategy adjustment, a new feasible strategy is found, both of which are secondary side system adjustment methods. In general, the secondary side system can reduce system risk and meet safety requirements. When the secondary side system cannot reduce risk, it needs to be combined with the primary side system for auxiliary decision-making.

[0077] If a new feasible strategy cannot be found, auxiliary decision-making adjustment is performed through the primary side system to change the generator output value of the power system until the risk of the power system protection typical fault scenario is acceptable, which specifically includes:

[0078] When no other route alternative strategy can be found, the primary side system needs to be combined with the secondary side system to adjust the generator output through double-layer optimization;

[0079] The double-layer optimization includes an upper-layer objective function and a lower-layer objective function, the upper-layer objective function calculates cost loss caused by preventive control adjustment of generator output and cost loss caused to the physical system due to unreliability of communication lines; upper-layer constraints are respectively power flow constraints under normal operation condition, power flow constraints under line fault condition, generator power constraints, power angle and line power flow constraints under normal condition and power angle and line power flow constraints under line fault condition.

[0080] In the upper-layer objective function, in the optimization process,

[0081]

[0082]

[0083]

[0084]

[0085]

[0086]

[0087]

[0088]

[0089] wherein i represents the i-th bus, k represents bus serial number of the controllable generator, represents power output of the k-th generator after preventive control, represents power output of the k-th generator before preventive control, Li represents load amount on the bus i, (M-1)×(M-1) represents admittance matrix of the system, j represents fault of the j-th transmission line, represents admittance matrix of the system when the fault f j occurs, and respectively represent system bus power angle after preventive control and after fault occurs, and respectively represent line power flow after preventive control and after fault occurs, and respectively represent maximum and minimum output power of the generator, maximum and minimum power angle and maximum and minimum line power flow constraints.

[0090] In formula (8), the meaning of is as follows: when the loss caused by power adjustment of the k-th generator due to communication route interruption, the loss can be measured by a piecewise function:

[0091]

[0092]

[0093]

[0094] Here The power output of the generator which transmits the adjustment strategy of the fault link is unchanged, and it is also equal to the result before preventive control. The rest of the generator power output is adjusted normally. When the line flow and power angle are within the specified range, no further generator power output adjustment is needed, although some generators are not adjusted according to the preventive strategy, the system is still stable. If the line flow or power angle exceeds the limit, the power output adjustment operation needs to be performed again. This process is represented as a linear programming function, the constraints are that the power angle and line flow after adjustment meet the constraints, and the objective function is to minimize the generator adjustment cost.

[0095] The lower-level objective function calculates the risk value of the communication system transmitting power adjustment services. The constraints are the flow constraints for the control center, relay nodes and target nodes in the information network, and the same communication link cannot transmit the same communication service.

[0096] In the lower-level objective function, the optimization process

[0097]

[0098] s.t. source:

[0099]

[0100] Relay node:

[0101]

[0102] Terminal:

[0103]

[0104] Any link cannot bidirectionally transmit the same service:

[0105]

[0106] D mn , R mn and respectively represent the delay, reliability index of the mn communication link and whether the control of the kth generator is transmitted through the mn communication link. If it is transmitted, then otherwise, it is

[0107] The application provides a primary and secondary system auxiliary decision-making method based on a system protection fault scene, which judges the risk of a power system protection typical fault scene through a secondary side system, selects other routing paths or emergency control strategy adjustment according to different situations, and adopts a primary system adjustment mode to reduce the risk when the secondary system cannot effectively reduce the system risk, so that the cooperation between the primary side system and the secondary side system decision-making is realized, and the protection capability of the overall power system is improved.

[0108] Reference Figure 3 The application further discloses a primary and secondary system auxiliary decision-making system based on a system protection fault scene, which comprises an expansion module 310, a judgment module 320 and an adjustment module 330.

[0109] The expansion module 310 is used for obtaining the existing faults of the communication channel from a database and storing the existing faults of the communication channel into a power system protection typical fault scene library; when the expansion module finds that the risk of the power system expected fault scene caused by the typical fault scene of the system protection is unacceptable, adjustment measures are taken for improvement, and the existing scheme is improved; the typical fault scene herein considers the faults of the communication system, so that the risk evaluation is more comprehensive.

[0110] The judgment module 320 is used for matching and checking the power system protection typical fault scene with the power system expected fault scene, and judging whether the risk of the power system protection typical fault scene is acceptable.

[0111] If the risk of the power system protection typical fault scene is unacceptable, the judgment module is used to select other routing paths through the secondary side system.

[0112] If a suitable other routing path cannot be selected, the judgment module is used to adjust the emergency control strategy through the secondary side system to find a new feasible strategy; and the adjustment of the secondary side system is completed.

[0113] For the original power system protection structure and control function, under the power system protection typical fault scene, a control routing path is selected again, a control routing path finding model is established, and when the original strategy cannot be executed by finding a suitable alternative routing path, other alternative measures are taken for adjustment.

[0114] The adjustment module 330 is used for judging whether the risk of the power system protection typical fault scene is unacceptable, and if so, selecting other routing paths through the secondary side system; if a suitable other routing path cannot be selected, adjusting the emergency control strategy through the secondary side system to find a new feasible strategy; and if the new feasible strategy cannot be found, adjusting the auxiliary decision-making through the primary side system to change the power system generator output value until the risk of the power system protection typical fault scene is acceptable.

[0115] If a new feasible strategy cannot be found, the primary system is combined with the adjustment to make auxiliary decision, the power system generator output value is changed, the primary system and the secondary system are combined and adjusted through the adjustment module to reduce the risk.

[0116] Specifically, it comprises:

[0117] When other alternative strategies cannot be found, the primary system and the secondary system are combined to perform double-layer optimization.

[0118] The double-layer optimization comprises an upper layer target function and a lower layer target function, the upper layer target function calculates the cost loss caused by the preventive control adjustment of the generator output and the cost loss caused by the unreliability of the communication line to the physical system.

[0119] The upper layer target function comprises:

[0120] When the loss caused by the power adjustment of the generator due to the interruption of the communication route is measured by a piecewise function, the generator output adjustment is not required to be performed when the line flow and the power angle are within the specified range; if the line flow overflows or the power angle overruns, the generator output adjustment operation needs to be performed.

[0121] The lower layer target function calculates the risk value of the communication system transmitting the power adjustment service.

[0122] The one-two system auxiliary decision system based on the system protection fault scene provided by the application judges the risk of the power system protection typical fault scene through the secondary system, selects other routing paths or emergency control strategies according to different situations, and adjusts the risk when the secondary system cannot effectively reduce the system risk, so as to realize the cooperation between the primary system and the secondary system decision, and improve the protection ability of the overall power system.

[0123] Figure 4 An example of an electronic device entity structure schematic diagram is shown in Figure 4 As shown, the electronic device can include a processor 410, a communication interface 420, a memory 430 and a communication bus 440, wherein the processor 410, the communication interface 420 and the memory 430 complete mutual communication through the communication bus 440. The processor 410 can call the logical instructions in the memory 430 to execute the one-two system auxiliary decision method based on the system protection fault scene, which comprises: obtaining the communication channel existing fault from the database, and storing the communication fault and the device fault into the power system protection typical fault scene library.

[0124] The typical fault scene of the power system protection is matched and verified with the expected fault scene of the power system, to determine whether the risk of the typical fault scene of the power system protection is acceptable;

[0125] If the risk of the typical fault scene of the power system protection is unacceptable, other routing paths are selected through the secondary system by re-routing;

[0126] If no other suitable routing path can be selected, a new feasible strategy is searched for through the emergency control strategy adjustment of the secondary system;

[0127] If no new feasible strategy can be found, the output value of the power system generator is changed through the auxiliary decision adjustment of the primary system until the risk of the typical fault scene of the power system protection is acceptable.

[0128] In addition, the logic instructions in the memory 430 described above can be implemented in the form of a software function unit and sold or used as an independent product, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0129] On the other hand, the present application also provides a computer program product, which comprises a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and the computer program is executed by a processor, so that the computer can execute the one-two system auxiliary decision method based on the system protection fault scene provided by the above-mentioned methods, the method comprises: obtaining the existing fault of the communication channel from the database, and storing the communication fault and the device fault in the power system protection typical fault scene library;

[0130] The typical fault scene of the power system protection is matched and verified with the expected fault scene of the power system, to determine whether the risk of the typical fault scene of the power system protection is acceptable;

[0131] If the risk of the typical fault scene of the power system protection is unacceptable, other routing paths are selected through the secondary system by re-routing;

[0132] If no other suitable routing path can be selected, an emergency control strategy adjustment is made through the secondary side system to find a new viable strategy.

[0133] If no new viable strategy can be found, an auxiliary decision adjustment is made through the primary side system to change the power system generator output value until the risk of the power system protection typical fault scenario is acceptable.

[0134] In another aspect, the present application also provides a non-transitory computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the one-two system auxiliary decision method based on the system protection fault scenario provided by the above method, the method comprising: obtaining a communication channel fault from a database, and storing the communication fault and the device fault in a power system protection typical fault scenario library;

[0135] The power system protection typical fault scenario is matched and verified with the power system expected fault scenario to determine whether the risk of the power system protection typical fault scenario is acceptable.

[0136] If the risk of the power system protection typical fault scenario is not acceptable, other routing paths are selected through the secondary side system by re-routing.

[0137] If no other suitable routing path can be selected, an emergency control strategy adjustment is made through the secondary side system to find a new viable strategy.

[0138] If no new viable strategy can be found, an auxiliary decision adjustment is made through the primary side system to change the power system generator output value until the risk of the power system protection typical fault scenario is acceptable.

[0139] The device embodiments described above are only illustrative, wherein the units illustrated as separate components can or can not be physically separated, and the components illustrated as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the present embodiment scheme according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0140] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0141] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A primary and secondary system aided decision method based on system protection fault scenarios, characterized in that, The system comprises: Obtaining the existing communication channel faults from the database and storing the communication faults and device faults into the power system protection typical fault scenario library; Matching and checking the power system protection typical fault scenario with the power system expected fault scenario to determine whether the risk of the power system protection typical fault scenario is acceptable; If the risk of the power system protection typical fault scenario is unacceptable, reselecting other routing paths through the secondary side system; If no other suitable routing path can be selected, adjusting the emergency control strategy through the secondary side system to find a new feasible strategy; If no new feasible strategy can be found, adjusting the auxiliary decision through the primary side system to change the power output value of the power system generator until the risk of the power system protection typical fault scenario is acceptable; If no new feasible strategy can be found, adjusting the auxiliary decision through the primary side system to change the power output value of the power system generator until the risk of the power system protection typical fault scenario is acceptable, which specifically comprises: When no other routing alternative strategy can be found, the power output of the generator needs to be adjusted through the combination of the primary side system and the secondary side system for double-layer optimization; The double-layer optimization comprises an upper layer target function and a lower layer target function, and the upper layer target function calculates the cost loss caused by the preventive control adjustment of the generator output and the cost loss caused by the unreliability of the communication line to the physical system; The lower layer target function calculates the risk value of the communication system for transmitting power adjustment services; The upper layer target function comprises: The loss of the power adjustment of the generator caused by the interruption of the communication routing is measured by a piecewise function, and when the line flow and power angle are within the specified range, the generator output adjustment is not needed to be performed; if the line flow oversteps or the power angle oversteps, the generator output adjustment operation needs to be performed.

2. The method of claim 1, wherein the system protection fault scenario based secondary system aided decision making method is characterized by, If the risk of the power system protection typical fault scenario is unacceptable, reselecting other routing paths through the secondary side system, which specifically comprises: For the original power system protection structure and control function, reselecting the available control routing paths under the power system protection typical fault scenario and establishing an available control routing path finding model.

3. The primary and secondary system aided decision method based on system protection fault scenarios according to claim 2, characterized in that, The specific expression of the available control routing path finding model is: The available control routing path finding model is a 0-1 integer programming, C S is an available master station, e is an available executive station, N r represents an available intermediate node, represents whether different services pass through the mn link, and is 1 if they do; the objective function represented by formula (1) routes the shortest, mn represents a communication link, and k represents a service.

4. The primary and secondary system aided decision method based on system protection fault scenarios according to claim 1, characterized in that, If no suitable other routing path can be selected, adjusting the emergency control strategy through the secondary side system to find a new feasible strategy, which specifically comprises: When the original strategy cannot be executed by finding a suitable alternative routing, other alternative measures are taken for adjustment, and the real-time optimization model expression of the alternative strategy is: f(P G1 ,P G2 ,…); P L1 ,P L2 ,…) ≥ ε (6) x i , c Gi , y j ,c Lj =0 or 1 (i=1,…n G ; j=1,…n L ) (7) The objective function is to minimize the total amount of generators and loads to be cut, formula (6) represents that the system meets the transient stability constraints after cutting generators and loads, formula (7) represents the sequence number of different cuttable generators or loads, x i and y j represent the cutting generator and load variables, c Gi and c Lj represent the available states of the cutting generator and load execution stations, which depend on the current system protection fault scenario, and the availability of the execution stations is different under different fault scenarios.

5. A primary and secondary system aided decision system based on system protection fault scenarios, characterized in that, The system comprises: An extension module for obtaining the existing communication channel faults from the database and storing the existing communication channel faults into the power system protection typical fault scenario library; A judgment module for matching and checking the power system protection typical fault scenario with the power system expected fault scenario to determine whether the risk of the power system protection typical fault scenario is acceptable; The adjusting module is configured to, if the risk of the typical fault scene of the power system protection is unacceptable, reselect other routing paths through the secondary system; if no suitable other routing path can be selected, perform emergency control strategy adjustment through the secondary system to find a new feasible strategy; if no new feasible strategy can be found, combine with the primary system to perform auxiliary decision making, change the power output value of the power system generator, and until the risk of the typical fault scene of the power system protection is acceptable. If no new feasible strategy can be found, the primary system is used to perform auxiliary decision making adjustment, and the power output value of the power system generator is changed until the risk of the typical fault scene of the power system protection is acceptable, which specifically includes: When no other routing alternative strategy can be found, the primary system and the secondary system need to be combined to perform double-layer optimization adjustment of the generator output. The double-layer optimization includes an upper-layer target function and a lower-layer target function, the upper-layer target function calculates the cost loss caused by the preventive control adjustment of the generator output and the cost loss caused by the unreliability of the communication line to the physical system. The lower-layer target function calculates the risk value of the communication system in transmitting the power adjustment service. The upper-layer target function includes: When the loss of the power adjustment of the generator caused by the interruption of the communication routing is measured by a piecewise function, if the line flow and the power angle are within the specified range, the generator output adjustment does not need to be performed; if the line flow or the power angle is out of limit, the generator output adjustment needs to be performed.

6. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the one-two system auxiliary decision making method based on the system protection fault scene according to any one of claims 1 to 4.

7. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the one-two system auxiliary decision making method based on the system protection fault scene according to any one of claims 1 to 4.

8. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the one-two system auxiliary decision making method based on the system protection fault scene according to any one of claims 1 to 4.

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