CN112398129A - Power grid post-accident risk control aid decision-making method and device and storage medium - Google Patents

Power grid post-accident risk control aid decision-making method and device and storage medium Download PDF

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CN112398129A
CN112398129A CN202011410495.7A CN202011410495A CN112398129A CN 112398129 A CN112398129 A CN 112398129A CN 202011410495 A CN202011410495 A CN 202011410495A CN 112398129 A CN112398129 A CN 112398129A
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power grid
power
fault
load
network
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CN112398129B (en
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俞晓峰
卢远
黄祎
黄志东
冼永生
肖昱杭
黄冕
邬中生
李宇健
曾丁
包小兵
黄炳鹏
何健
吴泽民
叶丽婕
罗日欣
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Guangdong Power Grid Co Ltd
Heyuan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Heyuan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Abstract

The invention discloses a power grid post-accident risk control aid decision method, a device and a storage medium, and the power grid post-accident risk control aid decision method comprises the following steps: after the current monitoring power grid has an accident, carrying out optimal load reduction on the current monitoring power grid; restoring the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method; and determining a transfer strategy of the current monitoring power grid based on a risk minimization target aiming at fault equipment in the current monitoring power grid. The power grid post-accident risk control assistant decision method, the device and the storage medium disclosed by the embodiment of the invention can effectively improve the efficiency of fault recovery of a power grid after a fault and reduce the risk of the power grid.

Description

Power grid post-accident risk control aid decision-making method and device and storage medium
Technical Field
The embodiment of the invention relates to an electric power technology, in particular to a method and a device for auxiliary decision-making of risk control after a power grid accident and a storage medium.
Background
With the rapid development of social life and production, the operation and application of power systems are becoming more and more complex and unstable. Therefore, the accident rate of the power system is relatively increased, and the loss caused by the accident is difficult to estimate. Especially in the application of regional power grids, due to the fact that some devices are updated slowly and protective measures are not in place, the phenomena of heavy load and overload are caused frequently, the safety and stability of power grid operation are reduced, and certain difficulty is brought to maintaining normal power supply of the power grid.
Disclosure of Invention
The invention provides an auxiliary decision-making method, an auxiliary decision-making device and a storage medium for controlling risk after a power grid accident, which can effectively improve the efficiency of fault recovery of a power grid after a fault and reduce the risk of the power grid.
In a first aspect, an embodiment of the present invention provides an auxiliary decision method for risk control after a power grid accident, including:
after the current monitoring power grid has an accident, carrying out optimal load reduction on the current monitoring power grid;
restoring the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method;
and determining a transfer strategy of the current monitoring power grid based on a risk minimization target aiming at fault equipment in the current monitoring power grid.
In a possible implementation manner of the first aspect, performing optimal load reduction on a currently monitored power grid includes:
performing optimal load reduction on the current monitoring power grid by taking the following minimum objective function of total power failure power of the power grid as an optimal load reduction model
Figure BDA0002818846520000021
wherein ,ΔPLiIndicating the amount of active reduction of load, Δ QLiIndicating amount of reactive load reduction, NbRepresenting the number of selected load shedding nodes in the currently monitored power grid.
In a possible implementation manner of the first aspect, the objective function of minimum total blackout power of the power grid has the following target constraints:
node power balancing
Figure BDA0002818846520000022
wherein ,PGiRepresenting active power of the generator, PLiRepresenting the active power of each load;
nodal reactive power balance
Figure BDA0002818846520000023
wherein ,QGiRepresenting reactive power of the generator, QLiRepresenting the reactive power of each load;
active power output constraint of generator
Figure BDA0002818846520000024
wherein ,
Figure BDA0002818846520000025
GiPrespectively representing the upper limit and the lower limit of the active output of the generator;
adjustable reactive power output constraint
Figure BDA0002818846520000026
Wherein,
Figure BDA0002818846520000027
GiQrespectively representing the upper limit and the lower limit of the reactive output of the generator;
line flow constraint
Figure BDA0002818846520000031
Wherein,
Figure BDA0002818846520000032
ijPrespectively representing the upper limit and the lower limit of the active transmission capacity of the transmission line;
node voltage constraint
Figure BDA0002818846520000033
Wherein,
Figure BDA0002818846520000034
iVrespectively representing the upper limit and the lower limit of the voltage amplitude of each node;
load node active load removal constraint
Figure BDA0002818846520000035
Wherein,
Figure BDA0002818846520000036
representing an upper limit of the reduction amount of the active load;
load node reactive load shedding constraint
Figure BDA0002818846520000037
Wherein,
Figure BDA0002818846520000038
upper for indicating reduction of reactive loadAnd (4) limiting.
In a possible implementation manner of the first aspect, recovering a power grid fault of a current monitoring power grid after load reduction based on a network reconfiguration method includes:
carrying out fault location on the current monitoring power grid after load reduction and determining load reduction amount;
carrying out network reconstruction on the current monitoring power grid, wherein the reconstructed current monitoring power grid meets the following conditions: and sequentially recovering the electrical load according to the priority of load reduction and supply, wherein the reconstructed power grid structure is closest to the power grid structure before reconstruction, the equipment in the reconstructed power grid is not overloaded, and the switching operation frequency is minimum.
In a possible implementation manner of the first aspect, performing network reconfiguration on a currently monitored power grid includes:
the method comprises the steps that fault recovery is achieved by changing the state of a switch inside a transformer substation, if the fault recovery is achieved, a network reconstruction scheme is determined, and if the fault recovery is not achieved, a fault influence range is obtained, and a fault tree is formed;
if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery, if the fault recovery is carried out, determining a network reconstruction scheme, otherwise, determining the network reconstruction scheme among the power distribution networks;
if the fault tree contains the whole power supply area in the power distribution network or the current power distribution area in the power distribution network does not determine a network reconfiguration scheme, searching a load transfer path between the power distribution networks, if the fault is recovered, determining the network reconfiguration scheme, and otherwise searching the load transfer path for the power supply areas of other power distribution networks to form a remote network reconfiguration scheme.
In a possible implementation manner of the first aspect, determining a transfer strategy of a currently monitored power grid based on a risk minimization target for a faulty device in the currently monitored power grid includes:
obtaining a risk grade for the fault equipment through risk identification;
determining whether degradation is needed according to the risk level;
if degradation is needed, network topology tracking is carried out through the risk existence range, a supply transfer strategy is generated according to the load flow calculation conclusion, and risk identification is carried out again after supply transfer;
and if the degradation is not needed, generating a transfer strategy after the degradation target is reached through iterative calculation.
In a possible implementation manner of the first aspect, after determining a transfer strategy of the currently monitored power grid based on the risk minimization target, the method further includes:
carrying out load flow calculation on the transfer strategy, and determining whether the transfer strategy causes the overload of the key equipment;
if yes, determining that the transfer strategy is unavailable, otherwise, performing N-1 analysis on the transfer strategy, determining whether the key equipment is overloaded after N-1, and if not, outputting the transfer strategy;
if the overload is caused, carrying out load flow calculation after adopting a spare power automatic switching exit scheme according to the overload capacity to determine whether the overload of the key equipment is caused, and if the overload is not caused, outputting a transfer strategy;
and if the overload occurs, outputting the orderly power utilization scheme.
In a second aspect, an embodiment of the present invention provides an auxiliary decision device for risk control after a power grid accident, including:
the load reduction module is used for carrying out optimal load reduction on the current monitoring power grid after the current monitoring power grid is in an accident;
the network reconstruction module is used for recovering the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method;
and the transfer module is used for determining a transfer strategy of the current monitoring power grid based on the risk minimization target aiming at the fault equipment in the current monitoring power grid after the power grid fault is recovered.
In a possible implementation manner of the second aspect, the network reconfiguration module is specifically configured to implement fault recovery by changing a state of an internal switch of the substation, determine a network reconfiguration scheme if the fault recovery is performed, and otherwise acquire a fault influence range to form a fault tree; if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery, if the fault recovery is carried out, determining a network reconstruction scheme, and if the fault recovery is not carried out, determining the network reconstruction scheme among the power distribution networks; if the fault tree contains the whole power supply area in the power distribution network or the current power distribution area in the power distribution network does not determine a network reconfiguration scheme, searching a load transfer path between the power distribution networks, if the fault is recovered, determining the network reconfiguration scheme, and otherwise searching the load transfer path for the power supply areas of other power distribution networks to form a remote network reconfiguration scheme.
In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a power grid post-accident risk control aid decision method according to any one of the implementations of the first aspect.
According to the power grid post-accident risk control assistant decision-making method, device and storage medium provided by the embodiment of the invention, after an accident occurs to a current monitoring power grid, optimal load reduction is carried out on the current monitoring power grid, then the power grid fault is recovered on the current monitoring power grid after load reduction based on a network reconstruction method, finally, a transfer strategy of the current monitoring power grid based on a risk minimization target is determined for fault equipment in the current monitoring power grid, and as network topology tracking is carried out on a risk existence range according to a risk identification result, all possible transfer schemes are found out, an assistant decision-making scheme is provided for scheduling optimization, the efficiency of fault recovery on the power grid after the fault can be effectively improved, and the risk of the power grid is reduced.
Drawings
Fig. 1 is a flowchart of an auxiliary decision method for risk control after a power grid accident according to an embodiment of the present invention;
fig. 2 is a network reconfiguration flowchart in the post-accident risk control assistant decision method for a power grid according to the embodiment of the present invention;
fig. 3 is a flow chart of a transfer strategy in the post-accident risk control assistant decision method for a power grid according to the embodiment of the present invention;
fig. 4 is a transfer decision flow chart in the post-accident risk control assistant decision method for a power grid according to the embodiment of the present invention;
fig. 5 is a schematic structural diagram of an auxiliary decision-making device for risk control after a power grid accident, according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a post-accident risk control assistant decision method for a power grid according to an embodiment of the present invention, and as shown in fig. 1, the post-accident risk control assistant decision method for a power grid according to the embodiment includes:
and S101, after the current monitoring power grid has an accident, carrying out optimal load reduction on the current monitoring power grid.
The method for controlling the risk after the power grid accident to assist the decision-making is used for carrying out risk identification on the power grid in which the accident occurs, so that the power grid can carry out network topology tracking on a risk existence range according to a risk identification result, find out all possible transfer schemes, and provide an assist decision-making scheme for scheduling optimization.
After the power grid has an accident, various parameters in the power grid change, so that the accident of the power grid can be known through monitoring parameters of multiple power grids. However, an accident of the power grid is generally caused by a fault of a device or a line, and then the load that the power grid in the accident can bear is also reduced, so that if the power grid in the accident still bears the original load, the other devices in the power grid may be overloaded or overloaded, and thus a greater risk may occur to the power grid. Therefore, in this embodiment, the power grid is monitored first, that is, various parameters in the power grid are monitored, and when one or more parameters in the power grid represent a power grid accident, it is determined that the currently monitored power grid has the accident. And if the current monitoring power grid has an accident, firstly carrying out optimal load reduction on the current monitoring power grid. The optimal load reduction is to reduce the load of the power grid in accidents and avoid the condition that the power grid is overloaded or overloaded due to high load.
The optimal load reduction is to adopt load loss operation, and calculate the power failure power in a risk state on the basis of optimal generator set output arrangement and power flow distribution of a power grid. By means of load reduction measures, the operational risk of the power grid can be reduced with minimal load expenditure.
In one embodiment, the current monitoring power grid can be optimally load-reduced by taking the minimum target function of the total outage power of the power grid as an optimal load reduction model
Figure BDA0002818846520000071
Wherein, Δ PLiIndicating the amount of active reduction of load, Δ QLiIndicating amount of reactive load reduction, NbRepresenting the number of selected load shedding nodes in the currently monitored power grid.
Further, the minimum objective function f (x) of the total blackout power of the power grid has the following target constraint conditions: 1) node power balancing
Figure BDA0002818846520000081
Wherein, PGiRepresenting active power of the generator, PLiRepresenting the active power of each load; 2) nodal reactive power balance
Figure BDA0002818846520000082
Wherein Q isGiRepresenting reactive power of the generator, QLiRepresenting the reactive power of each load; 3) active power output constraint of generator
Figure BDA0002818846520000083
Wherein,
Figure BDA0002818846520000084
GiPrespectively representing the upper limit and the lower limit of the active output of the generator;
4) adjustable reactive power output constraint
Figure BDA0002818846520000085
Wherein,
Figure BDA0002818846520000086
GiQrespectively representing the upper limit and the lower limit of the reactive output of the generator;
5) line flow constraint
Figure BDA0002818846520000087
Wherein,
Figure BDA0002818846520000088
ijPrespectively representing the upper limit and the lower limit of the active transmission capacity of the transmission line;
6) node voltage constraint
Figure BDA0002818846520000089
Wherein,
Figure BDA00028188465200000810
iVrespectively representing the upper limit and the lower limit of the voltage amplitude of each node;
7) load node active load removal constraint
Figure BDA00028188465200000811
Wherein,
Figure BDA00028188465200000812
representing an upper limit of the reduction amount of the active load;
8) load node reactive load shedding constraint
Figure BDA0002818846520000091
Wherein,
Figure BDA0002818846520000092
represents the upper limit of the reactive load reduction amount.
Through the 8 target constraint conditions, the optimal solution of the minimum target function of the total power failure power of the power grid can be obtained, and therefore the optimal load reduction scheme of the currently monitored power grid is determined.
And S102, restoring the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method.
After load reduction is performed on the current monitoring power grid, a scheme for reconstructing the power grid to recover the power grid fault can be determined. Network reconstruction is to adjust the network structure, and the adjustment of the network structure is an important means for optimizing the operation of the power grid and reducing the operation risk of the power grid. Network reconfiguration refers to under normal operating conditions: switching operation is carried out according to the network operation condition to adjust the network structure, so that on one hand, the load is balanced, the overload is eliminated, and the quality of the power supply voltage is improved; on the other hand, the network loss is reduced, and the economical efficiency of the system is improved. In a grid fault condition: through network reconstruction, the system can isolate faults when faults occur, reduce the power failure range and quickly recover power supply after the faults occur.
Specifically, the restoring of the grid fault of the current monitoring grid after load reduction based on a network reconstruction method comprises the following steps: and carrying out fault location on the current monitoring power grid after load reduction, determining load reduction and supply, and then carrying out network reconstruction on the current monitoring power grid. The reconstructed current monitoring power grid meets the following conditions: and sequentially recovering the electrical load according to the priority of load reduction and supply, wherein the reconstructed power grid structure is closest to the power grid structure before reconstruction, the equipment in the reconstructed power grid is not overloaded, and the switching operation frequency is minimum.
That is, the network reconfiguration scheme should satisfy the following conditions: 1) the power-loss load is recovered as much as possible, and the important load is recovered with priority for power supply by considering different grades of the load; 2) the number of switching operations should be minimized in consideration of the influence of the switching operation on the life of the switch and the time required for performing the switching operation; 3) the reconstructed system structure should be as close as possible to the structure before reconstruction, and the radiation network structure should be maintained; 4) all devices in the grid cannot be overloaded. The network reconstruction scheme meeting the condition requirements is a multi-objective and multi-constraint decision problem and a multi-stage combination optimization problem, and finally a series of switch action combinations are obtained.
Fig. 2 is a network reconfiguration flowchart in the post-accident risk control aid decision method for the power grid, which is provided in the embodiment of the present invention, and as shown in fig. 2, the network reconfiguration method provided in the embodiment includes:
step S201, fault location is carried out on the current monitoring power grid after load reduction, and load reduction amount is determined.
Step S202, fault recovery is realized by changing the state of the switch inside the substation, and if the fault is recovered, the network reconstruction scheme is determined, that is, step S207 is executed to select the optimal network reconstruction scheme. If the fault is not recovered, the fault influence range is obtained, and a fault tree is formed, that is, step S203 is executed.
Step S203, determining whether the fault tree only includes the current power distribution area in the power distribution network, if yes, performing step S204, otherwise, performing step S205.
And step S204, if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery. If the fault is recovered, determining a network reconfiguration scheme, namely executing step S207, otherwise executing step S205 to determine the network reconfiguration scheme among distribution networks;
step S205, if the fault tree includes the entire power supply area in the power distribution network or the network reconfiguration scheme is not determined in the current power distribution area in the power distribution network, a load transfer path is searched between the power distribution networks, and if the fault is recovered, the network reconfiguration scheme is determined, that is, step S207 is executed. Otherwise, step S206 is executed.
Step S206, seeking a load transfer path to the power supply area of the other power distribution network to form a remote network reconfiguration scheme, that is, executing step S207.
Step S103, determining a transfer strategy of the current monitoring power grid based on the risk minimization target aiming at the fault equipment in the current monitoring power grid.
In step S102, after the network reconfiguration scheme of the current monitoring network is determined, the fault device in the current monitoring grid is also determined, and then for the fault device in the current monitoring grid, a transfer strategy of the current monitoring grid based on the risk minimization target may also be determined. And the power grid risk needs to be considered for the power grid transfer strategy proposed for the current monitoring power grid, and the optimal transfer strategy with minimized risk is determined. In the transfer, other equipment or lines are used for replacing fault equipment in the power grid, so that the normal power supply of the power grid is recovered. After a transfer strategy of the current monitoring power grid based on the risk minimization target is determined, an auxiliary decision scheme can be provided for scheduling optimization after the power grid has an accident, so that a power grid scheduler can determine a specific scheme for processing the power grid after the fault according to the auxiliary decision scheme, the efficiency of fault recovery of the power grid after the fault can be effectively improved, and the risk of the power grid is reduced.
Fig. 3 is a flow chart of a transfer strategy in the post-accident risk control assistant decision method for a power grid, which is provided by the embodiment of the present invention, and as shown in fig. 3, the transfer strategy provided by the embodiment includes:
and S301, identifying the risk of the fault equipment to obtain a risk level.
Step S302, determining whether degradation is needed according to the risk level. If necessary, go to step S303, otherwise go to step S304.
And step S303, if degradation is needed, network topology tracking is carried out through the risk existence range, a supply transfer strategy is generated according to the load flow calculation conclusion, and risk identification is carried out again after supply transfer.
And step S304, if the degradation is not needed, generating a transfer strategy after the degradation target is reached through iterative calculation.
Further, after determining a transfer strategy of the current monitoring power grid based on the risk minimization target, the determined transfer strategy can be further judged, and whether the transfer strategy is generated or not is determined, so that an optimal transfer mode is found. Fig. 4 is a transfer decision flowchart in the post-accident risk control assistant decision method for a power grid, according to an embodiment of the present invention, as shown in fig. 4, the transfer decision provided in this embodiment includes:
and step S401, carrying out load flow calculation on the transfer strategy.
Step S402, determining whether the transfer strategy causes the overload of the key equipment. And if the overload exists, determining that the transfer strategy is not available. If not, step S403 is executed.
And step S403, carrying out N-1 analysis on the transfer strategy.
And step S404, determining whether the overload of the key equipment is caused after N-1. And if the overload is not generated, outputting a transfer strategy. If the overload is detected, step S405 is executed.
And step S405, adopting a spare power automatic switching exit scheme according to the overload amount.
And step S406, performing load flow calculation to determine whether the critical equipment is overloaded. And if the overload is not generated, outputting a transfer strategy. If the overload is detected, step S407 is executed.
And step S407, outputting the orderly power utilization scheme. The method comprises the steps of outputting, arranging the priority points or compiling and executing the orderly power utilization scheme and the load needing to be limited.
In summary, the transfer strategy and the transfer judgment can be summarized as follows: and aiming at fault equipment, obtaining a risk grade through N-1 risk identification, then determining whether the risk is reduced, if the risk grade needs to be reduced, carrying out network topology tracking through a risk existence range, generating a power transfer strategy (finding a power transfer line and a power transfer site) according to a load flow calculation conclusion, carrying out risk identification again after power transfer to calculate the risk grade, if the grade is not reduced to an expected target, carrying out power transfer calculation again, and finding out an optimal power transfer mode through repeated iterative calculation optimization.
According to the power grid post-accident risk control assistant decision-making method provided by the embodiment, after an accident occurs to a current monitoring power grid, optimal load reduction is performed on the current monitoring power grid, then the power grid fault is recovered on the current monitoring power grid after load reduction based on a network reconstruction method, finally a transfer strategy of the current monitoring power grid based on a risk minimization target is determined for fault equipment in the current monitoring power grid, and as network topology tracking is performed on a risk existence range according to a risk identification result, all possible transfer schemes are found out, an assistant decision-making scheme is provided for scheduling optimization, the efficiency of fault recovery on the power grid after the fault can be effectively improved, and the risk of the power grid is reduced.
The following describes the risk control aid decision method after the power grid accident, which is provided by the embodiment of the invention, by taking a power grid specific accident as an example. Taking the case of a station a main transformer operating in a certain manner as an example, suppose that after a station a #1 main transformer fails, the station a #2 main transformer is disconnected, which may cause a 110kV station loss of voltage supplied by the station a at a 220kV station, resulting in a secondary event, and the risk identification interface is as shown in table 1:
TABLE 1
Figure BDA0002818846520000131
Through the power grid post-accident risk control assistant decision method provided by the embodiment of the invention, all possible transfer schemes can be provided, and the transfer schemes are verified according to the transfer verification method shown in fig. 4. First, a transfer method 1 is generated, and the transfer method 1 is shown in table 2. And performing load flow calculation on the transfer mode 1 shown in the table 2, analyzing whether the overload of the key equipment is caused, if so, indicating that the transfer mode is not feasible, and if not, performing N-1 analysis on the transfer mode.
TABLE 2
Figure BDA0002818846520000132
Figure BDA0002818846520000141
And (3) after N-1 analysis is carried out on the transfer mode 1 shown in the table 2, determining that the G station is overloaded, adopting different spare power automatic switching exit schemes according to the two schemes, and carrying out load flow calculation. The transfer mode adjustment scheme is shown in table 3.
TABLE 3
Figure BDA0002818846520000142
Figure BDA0002818846520000151
As can be seen from table 3, after the backup automatic switching exit scheme is adopted, the load flow calculation still causes the overload of the critical equipment, and then the switching mode adjustment scheme as shown in table 4 is executed. The final orderly power utilization scheme will be finally output according to table 4.
TABLE 4
Figure BDA0002818846520000152
Fig. 5 is a schematic structural diagram of the post-accident risk control assistant decision device for a power grid according to an embodiment of the present invention, and as shown in fig. 5, the post-accident risk control assistant decision device for a power grid according to the present embodiment includes:
and the load reduction module 51 is configured to perform optimal load reduction on the currently monitored power grid after an accident occurs to the currently monitored power grid.
And the network reconfiguration module 52 is configured to recover the power grid fault of the currently monitored power grid after load reduction based on a network reconfiguration method.
And the transfer module 53 is configured to determine, for the fault device in the currently monitored power grid after the power grid fault is recovered, a transfer strategy of the currently monitored power grid based on the risk minimization target.
The post-accident risk control assistant decision-making device for the power grid is used for realizing the technical scheme of the post-accident risk control assistant decision-making method for the power grid shown in fig. 1, and the implementation principle and the technical effect are similar, and are not described herein again.
Further, on the basis of the embodiment shown in fig. 5, the network reconfiguration module 52 is specifically configured to implement fault recovery by changing a state of an internal switch of the substation, determine a network reconfiguration scheme if the fault recovery is performed, and otherwise, obtain a fault influence range to form a fault tree; if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery, if the fault recovery is carried out, determining a network reconstruction scheme, and if the fault recovery is not carried out, determining the network reconstruction scheme among the power distribution networks; if the fault tree contains the whole power supply area in the power distribution network or the current power distribution area in the power distribution network does not determine a network reconfiguration scheme, searching a load transfer path between the power distribution networks, if the fault is recovered, determining the network reconfiguration scheme, and otherwise searching the load transfer path for the power supply areas of other power distribution networks to form a remote network reconfiguration scheme.
The present invention also provides a storage medium containing computer executable instructions for performing a post grid accident risk control aid decision method when executed by a computer processor, the method comprising: after the current monitoring power grid has an accident, carrying out optimal load reduction on the current monitoring power grid; restoring the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method; and determining a transfer strategy of the current monitoring power grid based on a risk minimization target aiming at fault equipment in the current monitoring power grid.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A power grid post-accident risk control aid decision method is characterized by comprising the following steps:
after the current monitoring power grid has an accident, carrying out optimal load reduction on the current monitoring power grid;
restoring the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method;
and determining a transfer strategy of the current monitoring power grid based on a risk minimization target aiming at the fault equipment in the current monitoring power grid.
2. The method of claim 1, wherein the optimally load shedding the currently monitored power grid comprises:
performing optimal load reduction on the current monitoring power grid by taking the following minimum objective function of total power failure power of the power grid as an optimal load reduction model
Figure FDA0002818846510000011
Wherein, Δ PLiIndicating the amount of active reduction of load, Δ QLiIndicating amount of reactive load reduction, NbRepresenting the number of selected load shedding nodes in the currently monitored power grid.
3. The method of claim 2, wherein the grid total outage power minimum objective function has the following target constraints:
node power balancing
Figure FDA0002818846510000012
Wherein, PGiRepresenting active power of the generator, PLiRepresenting the active power of each load;
nodal reactive power balance
Figure FDA0002818846510000013
Wherein Q isGiRepresenting reactive power of the generator, QLiRepresenting the reactive power of each load;
active power output constraint of generator
Figure FDA0002818846510000021
Wherein,
Figure FDA0002818846510000022
GiPrespectively representing the upper limit and the lower limit of the active output of the generator;
adjustable reactive power output constraint
Figure FDA0002818846510000023
Wherein,
Figure FDA0002818846510000024
GiQrespectively representing the upper limit and the lower limit of the reactive output of the generator;
line flow constraint
Figure FDA0002818846510000025
Wherein,
Figure FDA0002818846510000026
ijPrespectively representing the upper limit and the lower limit of the active transmission capacity of the transmission line;
node voltage constraint
Figure FDA0002818846510000027
Wherein,
Figure FDA0002818846510000028
iVrespectively representing the upper limit and the lower limit of the voltage amplitude of each node;
load node active load removal constraint
Figure FDA0002818846510000029
Wherein,
Figure FDA00028188465100000210
representing an upper limit of the reduction amount of the active load;
load node reactive load shedding constraint
Figure FDA00028188465100000211
Wherein,
Figure FDA00028188465100000212
represents the upper limit of the reactive load reduction amount.
4. The method according to any one of claims 1 to 3, wherein the recovering of the grid fault of the current monitoring grid after load reduction based on a network reconstruction method comprises:
carrying out fault location on the current monitoring power grid after load reduction and determining load reduction amount;
carrying out network reconstruction on the current monitoring power grid, wherein the reconstructed current monitoring power grid meets the following conditions: and sequentially recovering the electrical load according to the priority of load reduction and supply, wherein the reconstructed power grid structure is closest to the power grid structure before reconstruction, the equipment in the reconstructed power grid is not overloaded, and the switching operation frequency is minimum.
5. The method of claim 4, wherein the network reconfiguring the currently monitored power grid comprises:
the method comprises the steps that fault recovery is achieved by changing the state of a switch inside a transformer substation, if the fault recovery is achieved, a network reconstruction scheme is determined, and if the fault recovery is not achieved, a fault influence range is obtained, and a fault tree is formed;
if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery, if the fault recovery is carried out, determining a network reconstruction scheme, otherwise, determining the network reconstruction scheme among the power distribution networks;
if the fault tree contains the whole power supply area in the power distribution network or the current power distribution area in the power distribution network does not determine a network reconfiguration scheme, searching a load transfer path between the power distribution networks, if the fault is recovered, determining the network reconfiguration scheme, and otherwise searching the load transfer path for the power supply areas of other power distribution networks to form a remote network reconfiguration scheme.
6. The method according to any one of claims 1 to 3, wherein the determining, for the fault device in the currently monitored power grid, a transfer strategy of the currently monitored power grid based on a risk minimization target comprises:
obtaining a risk grade for the fault equipment through risk identification;
determining whether degradation is required according to the risk level;
if degradation is needed, network topology tracking is carried out through the risk existence range, a supply transfer strategy is generated according to the load flow calculation conclusion, and risk identification is carried out again after supply transfer;
and if the degradation is not needed, generating a transfer strategy after the degradation target is reached through iterative calculation.
7. The method of claim 6, wherein after determining a transfer strategy for the currently monitored power grid based on a risk minimization objective, further comprising:
carrying out load flow calculation on the transfer strategy, and determining whether the transfer strategy causes key equipment overload;
if yes, determining that the supply transfer strategy is unavailable, otherwise, performing N-1 analysis on the supply transfer strategy, determining whether the overload of the key equipment is caused after N-1, and if not, outputting the supply transfer strategy;
if the overload is caused, carrying out load flow calculation after adopting a spare power automatic switching exit scheme according to the overload capacity to determine whether the overload of the key equipment is caused, and if the overload is not caused, outputting the switching strategy;
and if the overload occurs, outputting the orderly power utilization scheme.
8. A risk control aid decision-making device after a power grid accident is characterized by comprising:
the load reduction module is used for carrying out optimal load reduction on the current monitoring power grid after the current monitoring power grid is in an accident;
the network reconstruction module is used for recovering the power grid fault of the current monitoring power grid after load reduction based on a network reconstruction method;
and the transfer module is used for determining a transfer strategy of the current monitoring power grid based on the risk minimization target aiming at the fault equipment in the current monitoring power grid after the power grid fault is recovered.
9. The device according to claim 8, wherein the network reconfiguration module is specifically configured to implement fault recovery by changing a state of an internal switch of the substation, determine a network reconfiguration scheme if the fault recovery is performed, and otherwise obtain a fault influence range to form a fault tree; if the fault tree only contains the current power distribution area in the power distribution network, searching for an investable tie line in the current power distribution area to realize fault recovery, if the fault recovery is carried out, determining a network reconstruction scheme, and if the fault recovery is not carried out, determining the network reconstruction scheme among the power distribution networks; if the fault tree contains the whole power supply area in the power distribution network or the current power distribution area in the power distribution network does not determine a network reconfiguration scheme, searching a load transfer path between the power distribution networks, if the fault is recovered, determining the network reconfiguration scheme, and otherwise searching the load transfer path for the power supply areas of other power distribution networks to form a remote network reconfiguration scheme.
10. A computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements a post-grid accident risk control aid decision method according to any one of claims 1 to 8.
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