CN109217298B - Emergency control strategy calculation method for coping with dynamic process successive events - Google Patents
Emergency control strategy calculation method for coping with dynamic process successive events Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
Abstract
The invention discloses an emergency control strategy calculation method for dealing with dynamic process successive events, which comprises the following steps: forming a sequential event sequence information table and carrying out safety and stability evaluation according to the table; analyzing and calculating a safety and stability emergency control strategy of a successive event sequence with the safety and stability margin not meeting the requirement to form an emergency control measure table of the successive event sequence; performing compatibility analysis of the control measures of the sequential event sequence on each control object; carrying out public control strategy calculation and additional control strategy calculation on the successive event sequence, and respectively obtaining a public control strategy and an additional control strategy; and uniformly merging the public control strategy and the additional control strategy in time sequence and stages to form a complete emergency control strategy. The invention can realize that the implementation control measures are started in the process of development of the successive events, and the same requirements and the differentiation requirements of different successive event sequences in the dynamic process after initial large disturbance on the emergency control strategy are comprehensively considered.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an emergency control strategy calculation method for dealing with dynamic process sequential events.
Background
In large interconnected networks, various large disturbances often occur. Grid disturbances are changes in the electrical quantities of the system caused by sudden changes in certain operating conditions during operation of the system. Disturbances in power systems can be divided into small disturbances and large disturbances: small disturbances refer to disturbances caused by normal fluctuation of the load, power and current control, adjustment of the tap of the transformer, irregular fluctuation of the power of the tie line, and the like. Large disturbances refer to disturbances caused by short circuits of system components, circuit breaker switching, and other large power or impedance changes. The power system is a complex nonlinear large system, the influence of small disturbance on the behavior characteristic of the system is generally independent of the magnitude and the occurrence place of the disturbance, and the influence is relatively small, so that the small disturbance is not researched.
When large disturbance occurs, a power system generates large state deviation and oscillation, the disturbance is untimely and presents a certain correlation phenomenon, some large disturbances of a local power grid in one place can be transmitted to other nodes, new large disturbances can be caused to cause the large disturbances of other nodes, the influence range of the disturbances is expanded, and if proper measures are not taken in time to suppress the disturbances, serious large-range power failure accidents can be developed. The large-scale power failure can cause serious economic and social losses, so that the research on the large disturbance phenomenon in the power grid has important theoretical and practical significance.
After a large disturbance (for example, a short-circuit fault occurs in a line), the power grid needs to go through a dynamic process to transit to a new steady-state operation. In the dynamic process, events which change with time may occur due to the change of fault form, the clearing of faults by the relay protection action, the action of the safety automatic device and the like, and are called dynamic process successive events.
After the power grid is disturbed by some serious disturbances, safety and stability emergency control measures need to be taken quickly to maintain the safe and stable operation of the power grid. The timeliness of the control is very important for safety and stability emergency control, generally speaking, emergency control after a power grid is greatly disturbed is faster and better, the starting and implementation time of the emergency control is shortened, the control quantity can be obviously reduced under the condition of realizing the same control effect, and the control cost performance is improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides an emergency control strategy calculation method for dealing with successive events in a dynamic process, which can realize that control measures are started and implemented in the process of development of the successive events, and comprehensively considers the same requirements and the different requirements of different successive event sequences in the dynamic process on the emergency control strategy after initial large disturbance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a method of emergency control strategy calculation for handling dynamic process succession events, the method comprising the steps of:
acquiring basic information, wherein the basic information comprises: initial event information and dynamic process succession event information;
analyzing the time sequence of the occurrence of successive events in the dynamic process after the initial event to form a successive event sequence information table;
performing safety and stability evaluation according to the information table of the successive event sequences to obtain the safety and stability margin of each successive event sequence;
analyzing and calculating a safety and stability emergency control strategy of a successive event sequence with the safety and stability margin not meeting the requirement to form an emergency control measure table of the successive event sequence;
performing successive event sequence control measure compatibility analysis on each control object according to the successive event sequence emergency control measure table;
according to the compatibility analysis result, carrying out public control strategy calculation on the successive event sequence to obtain a public control strategy and public control strategy control time;
considering the influence of a common control strategy, performing additional control strategy calculation on the successive event sequences to obtain an additional control strategy and additional control strategy control time;
and uniformly merging the public control strategy and the additional control strategy of each successive event sequence needing to implement safety and stability control according to time sequence and stages to form a complete emergency control strategy.
Further, the dynamic process succession event information includes: successive event type, location and time of occurrence;
the successive event types include: fault information, relay protection action information, safety automatic device action information and power electronic equipment operation state change information.
Further, the successive event sequence information table includes: the total number of time periods of the sequence of successive events, the time at which each time period event occurred, and event description information for each time period.
Further, the method for acquiring the safety margin comprises the following steps:
for the successive event sequence, forming an expected fault required by safety stability evaluation calculation based on the initial event information and the successive event sequence information table;
and on the premise of not taking emergency control measures in the whole process, based on safety and stability simulation calculation data, adopting power system safety and stability quantitative analysis software to obtain the safety and stability margin of each successive event sequence.
Further, the method for forming the emergency control measure table of the successive event sequence comprises the following steps:
forming expected faults required by safety and stability evaluation calculation for each successive event sequence based on the initial event information and the successive event sequence information table;
and performing control strategy calculation based on the safety and stability simulation calculation data and the candidate control measure information under the condition that the emergency control strategy is implemented by starting at the last event occurrence time of the successive event sequence to form an emergency control measure table of the successive event sequence.
Further, the method for calculating the common control strategy comprises the following steps:
identifying a compatible sequential event sequence set of each control object according to the sequential event sequence compatibility analysis result;
determining the control time of the common control strategy of each successive event sequence in the compatible successive event sequence set;
determining candidate control objects of a common control strategy according to the compatible successive event sequence sets of the control objects;
and analyzing and calculating a control strategy which is acceptable for all the successive event sequences in the successive event sequence set according to the control time of the common control strategy and the candidate control object, and taking the control strategy as the common control strategy of the successive event sequence set.
Further, the method of identifying a compatible set of consecutive event sequences comprises:
and comparing and analyzing the successive event sequence sets compatible with the candidate control objects, screening out the control object with the maximum number of compatible successive event sequences, and judging the corresponding compatible successive event sequence set as the compatible successive event sequence set.
Further, the method for determining the control time of the common control strategy comprises the following steps:
analysis of the time t at which the last identical event occurred within a statistically compatible set of consecutive event sequencesc1And the earliest time t at which a different event occursc2Control time t of a common control strategycomThe value-taking principle is as follows:
tc1<tcom<tc2。
further, the method for determining the candidate control object of the common control strategy comprises the following steps:
successive events consistent from individual control objectsSequence set CRC (k,1), searching each control object k compatible with all the successive event sequences in the corresponding compatible successive event sequence setcControl object kcNamely candidate control objects; wherein k iscThe following conditions are satisfied:
CRC(kc,1)＝CRC(k0,1)；
in the formula, k0 represents the control object with the largest number of compatible sequences of consecutive events.
Further, the method for calculating the additional control strategy comprises the following steps:
and considering the influence of a common control strategy, and performing safety and stability evaluation on the sequential event sequence:
if the safety stability margin of the sequence of the successive events meets the requirement, the additional control strategy does not need to be calculated;
if the safety stability margin of the sequence of successive events does not meet the requirement, an additional control strategy needs to be calculated, and the following steps are carried out:
after the public control strategy is implemented, taking the successive events and the public control strategy action contained in the successive event sequence with the safety stability margin not meeting the requirement as initial conditions;
implementing the candidate control strategy after the last event of the contained successive events;
and removing the control objects contained in the common control strategy from the candidate control object set allowed by the contained successive events, calculating the candidate control object set of the additional control strategy as the successive event sequence, and optimizing the control strategy which meets the requirement of the safety stability margin in the calculated successive event sequence, thereby obtaining the unique additional control strategy.
In summary, the emergency control strategy calculation method for dealing with dynamic process successive events provided by the present invention closely combines the characteristics of occurrence and development of successive events after a power grid is greatly disturbed, analyzes various successive event sequences that may occur after the power grid is greatly disturbed, performs compatibility analysis of control measures on the successive event sequences that need to adopt safety and stability control measures, divides the control strategies into a common control strategy and an additional control strategy for the successive event sequences with control measure compatibility, starts to implement the common control strategy after the last common event of the compatible successive event sequence occurs, takes account of the influence of the common control strategy after all events of each successive event sequence themselves occur, and starts to implement the additional control strategy according to needs, and the method of the present invention can implement the implementation of control measures in the process of development of successive events, the method fully considers the characteristics of the occurrence and development processes of the successive events in the dynamic process after the power grid is greatly disturbed, gives overall consideration to the same requirements and the differentiation requirements of different successive event sequences in the dynamic process after the initial large disturbance on the emergency control strategy, can provide support for accelerating the emergency control speed, can avoid over-control, and avoids the problem that the control measures in different successive event sequences conflict with each other. The method can provide a solution of key problems for improving the emergency control benefits of dynamic process successive events after the power grid is greatly disturbed.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention;
fig. 2 is a schematic diagram of a sequence of successive events according to an embodiment of the present invention.
Detailed Description
Aiming at the actual situation that different successive event sequences are possible to occur after the same initial large disturbance, the method for calculating the emergency control strategy for the successive events in the dynamic process analyzes the compatibility and the repulsion of control measures for the successive event sequences needing to take safe and stable control measures; for successive sequences of events having control measure repulsion, avoiding the use of the same control measure; for the sequential event sequence with control measure compatibility, dividing the control strategy into a public control strategy and an additional control strategy; starting to implement a common control strategy after a common event occurs; and after all events of each successive event sequence occur, considering the influence of the common control strategy, and starting to implement the additional control strategy. By using the method, the implementation control measures can be started in the process of development of the successive events, the same requirements and the differentiation requirements of different successive event sequences in the dynamic process after initial large disturbance on the emergency control strategy are considered comprehensively, and a solution of a key problem can be provided for improving the emergency control benefit of the dynamic process successive events after the large disturbance on the power grid.
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As a preferred embodiment of the present invention, fig. 1 shows a flow chart thereof, which specifically includes the following steps:
step 1 depicted in fig. 1 is to acquire basic information, where the basic information includes initial event information, dynamic process successive event information after the power grid is disturbed, safety and stability simulation analysis calculation data, and candidate emergency control measure information;
the dynamic process is the phase that is experienced from the grid after an initial large disturbance to the grid transition to a new steady state.
The dynamic process successive events refer to discrete events that the running state of the power grid changes in the dynamic process after the power grid is subjected to large disturbance (such as fault), and the safety and stability control device can monitor that the event types are as follows: (1) faults, including new faults and fault morphology changes, and disappearance of faults; (2) the method comprises the following steps of power grid topological structure change, main transformer shutdown, generator set shutdown and load removal caused by actions of a relay protection and safety automatic device (without safety and stability emergency control); (3) the power electronic equipment operating state changes significantly, for example, dc blocking.
The successive event information comprises event type, position and occurrence time, and the initial large disturbance occurrence time is used as the starting time of the timing of other successive events. At the same time, if multiple events occur, they all need to be listed.
Step 2 depicted in fig. 1 is a sequential event sequence analysis, forming a sequential event sequence information table.
Based on the initial event, the time sequence of the occurrence of the successive events in the dynamic process after the initial event is analyzed by combining the operation condition, the subsequent fault form and the evolution condition thereof, the relay protection and the configuration of the safety automatic device and the action condition thereof, and a successive event sequence information table is formed, wherein the successive event sequence information table comprises event information and occurrence time information.
For a certain initial event, the subsequent fault form and the evolution thereof can have multiple forms, and the actions of relay protection, a safety automatic device and primary equipment can have multiple conditions such as correct action, misoperation, rejection and the like, and can have multiple successive event sequences, and the multiple successive event sequences are analyzed one by one to form a corresponding successive event sequence information table.
The successive event sequence information tables ie (i), Et (j,1) and Et (j,2) respectively correspond to the total number of periods of the i-th successive event sequence, the time at which the j-th period event occurs, and the corresponding event description information thereof. The initial disturbance information is not contained in the successive event sequence information table; et (j,1) and Et (j,2) correspond to information of the 1 st successive event sequence when j is 1, …, IE (1), Et (j,1) and Et (j,2) correspond to information of the 2 nd successive event sequence when j is 1+ IE (1), …, IE (2) + IE (1), and so on; if multiple events occur at time Et (j,1) for a certain period j, Et (j,2) should contain multiple event information that occurred at that time.
Each of the successive events should be an event that the security control device can collect information and can identify.
When the time interval of the successive events is divided and the occurrence time of the events is determined, if the two time intervals are so small that the safety control device cannot distinguish, the two time intervals are combined into one time. Successive event period division principle: the real-time control device may identify an event.
Step 3 depicted in fig. 1 is a successive event safety margin evaluation, resulting in a safety margin for each successive sequence of events.
And forming expected faults required by safety stability evaluation calculation for each successive event sequence based on the initial event information and the successive event sequence information tables IE (i), Et (j,1) and Et (j,2), and performing electromechanical transient time domain simulation and safety stability quantitative evaluation by adopting power system safety stability quantitative analysis software based on safety stability simulation calculation data on the premise of not taking emergency control measures in the whole process to obtain a safety stability margin gamma (i) of each successive event sequence.
Step 4 depicted in fig. 1 is to analytically calculate a safety and stability emergency control strategy for a sequence of consecutive events i of the safety and stability margin γ (i) < 0.
Forming an expected fault required by safety and stability evaluation calculation based on the initial event information and the successive event sequence information tables IE (i), Et (j,1) and Et (j, 2); and (3) starting and implementing an emergency control process at the occurrence time Et (j,1) of the last event of the successive event sequence i as a condition, based on safety and stability simulation calculation data and candidate control measure information, performing electromechanical transient time domain simulation and control strategy optimization calculation by adopting commercial power system safety and stability quantitative analysis and optimization control decision software to form a successive event sequence emergency control measure table CE (i, k) corresponding to the control quantities of the ith successive event sequence and the kth control object.
It should be noted that: when the emergency control strategy is calculated, the time of implementing emergency control measures such as a switch-off machine, a load-shedding machine and the like is not taken as the time of implementing the emergency control measures such as the switch-off machine, the load-shedding machine and the like at the occurrence time Et (j,1) of the last event, but is taken as the effective time of the measures such as the switch-off machine, the load-shedding machine and the like after the device processing and.
Taking the 1 st successive event as an example, j is IE (1), and the time when the emergency control flow is started is Et (IE (1),1), and then, according to the specific conditions of the safety control device/system itself, the configuration, the communication and the like, the effective time of measures such as the switching off machine, the load cutting and the like can be taken by adding an appropriate delay.
Step 5 depicted in FIG. 1 is to perform a sequential event sequence control measure compatibility and mutual exclusivity analysis.
Performing a sequential event sequence emergency control measure compatibility analysis on each control object based on the sequential event sequence emergency control measure table CE (i, k) obtained in the step 4), identifying sequential event sequence sets CRC (k,1) compatible with each control object, and identifying sequential event sequence sets CRC (k,2) repellent with each control object.
Further, identifying a consistent sequence of consecutive events for each control objectThe method of column set CRC (k,1) is: if for successive event sequences i1And i2All need to control the kth control object, and the control directions are the same, then for the control object k, the successive event sequence i1And i2Are compatible. For example, for a sequence of successive events i1And i2If the emergency power reduction needs to be performed on the direct current k, then the direct current k is subjected to a sequential event sequence i1And i2Are compatible.
Further, the method of identifying the successive event sequence sets CRC (k,2) that each control object repels is: if for successive event sequences i1And i2All need to control the kth control object, but the control direction is opposite, and for the control object k, the sequential event sequence i1And i2Are repulsive. For example, for a sequence of successive events i1For a sequence of successive events i, requiring an emergency power down for DC k2If an emergency power up is required for DC k, then for DC k, a sequence of successive events i1And i2Are repulsive.
Step 6 depicted in fig. 1 is a successive event control strategy optimization calculation.
The control strategy calculation of the successive event sequence is divided into two stages of common control strategy calculation and additional control strategy calculation. The common control strategy is a control strategy suitable for two or more successive event sequences, and comprises control time, a control object and a control quantity. The additional control strategy is a control strategy which needs to be added on a certain successive event sequence on the basis of a common control strategy. The complete emergency control strategy for a sequence of successive events is: the common control strategy is superimposed with its additional control strategy.
6-1) the calculation of the public control strategy is refined into the following steps:
6-1-1) identifying compatible sets of consecutive event sequences
Identifying compatible successive event sequence sets based on the successive event sequence compatibility analysis result obtained in step 5), i.e. the successive event sequence sets CRC (k,1) compatible with each control object.
The method for identifying compatible sets of consecutive event sequences is: and (3) comparing and analyzing the compatible successive event sequence sets CRC (k,1) of the candidate control objects, screening out the control object k0 with the maximum number of compatible successive event sequences, and judging the corresponding compatible successive event sequence set CRC (k0,1) as the compatible successive event sequence set. If there are a plurality of compatible successive event sequence sets satisfying the condition, the compatible successive event sequence set and its control object k0 are determined on the basis of the safety margin weighting and the absolute value minimum.
6-1-2) analyzing and determining control timing of common control strategy
The timing of the common control strategy for each successive event sequence in the compatible successive event sequence set CRC (k0,1) is determined by analyzing the time t at which the last identical event occurs within the statistically compatible successive event sequence set CRC (k0,1)c1And the earliest time t at which a different event occursc2Time t of starting common control strategy controlcomThe value-taking principle is as follows:
tc1<tcom<tc2
t is t under the premise of meeting the above conditions for better control effectcomThe smaller the better.
For example, as shown in the schematic diagram of the sequence of successive events in fig. 2, 3 sequences of events L1, L2, and L3, where event a is an initial large disturbance event, L1 is composed of events a and B, L2 is composed of events A, B and C, L3 is composed of events A, B and D, and the occurrence time of each event is tA、tB、tCAnd tD(ii) a L2 and L3 are compatibility events, repelling L1. t is tc1＝tc，tc2＝tD，tcomThe value-taking principle is as follows:
tc<tcom<tD
6-1-3) analyzing and determining common control strategy candidate control objects
Searching each control object k compatible with all the successive event sequences in the successive event sequence set CRC (k0,1) based on the successive event sequence set CRC (k,1) compatible with each control object obtained in the step 5)c，kcIs enough to satisfyThe following conditions:
CRC(kc,1)＝CRC(k0,1)
for example, the common control strategy candidate control objects for the 3 event sequences L1, L2, and L3, L2, and L3 shown in fig. 2 are control objects that are effective for both L2 and L3 in the control measure.
6-1-4) common control strategy optimization calculation
T determined in 6-1-2)comAs the starting time of the control strategy, based on the candidate control object k obtained in the step 6-1-3)cThe control strategy that is acceptable for all the successive event sequences in the successive event sequence set CRC (k0,1) is analytically calculated as a common control strategy for the successive event sequence set CRC (k0, 1). The calculation method is as follows:
(1) and (3) selecting a sequence of successive events: in the compatible successive event sequence set CRC (k0,1), the successive event sequence k is selected which does not meet the requirement of the safety margin and is closest to the requirement (for example, less than 0 and closest to 0)m，
(2) For successive event sequences kmWith tcomImplementing starting time for control measures, the candidate control measures are 6-1-3), the determined candidate control objects are taken as constraint conditions, the safety stability margin meeting requirements (the safety stability margin is more than 0), and the calculation control strategy is optimized, so that a common control strategy C is obtainedcom。
It should be noted that: when calculating the emergency control strategy, t is notcomThe implementation time of emergency control measures such as switching off and switching on load is added with the device processing and communication delay, and the implementation time of measures such as switching off and switching on load can be taken as the effective time of the measures such as switching off and switching on load.
If the power grid evolution process is complex after the initial disturbance occurs, more sequential event sequences are formed, and a plurality of branches are provided, and the plurality of branches are respectively subjected to public control strategy calculation; in each branch, the evolution can be divided into a plurality of stages, the number of successive event sequences of each stage is changed, and the stages are divided according to the change condition of the successive event sequences to carry out common control strategy calculation. Therefore, different branch and different stage compatibility successive event sequences have differences, corresponding common control strategies are provided, and a plurality of common control strategies are possible for a certain successive event sequence.
6-2) additional control strategy calculation
If the safety margin of a certain successive sequence of events cannot meet the requirements by means of the common control strategy alone, the calculation of the additional control strategy is carried out.
Respectively calculating an additional control strategy for each successive event sequence needing to be subjected to additional control strategy calculation under the condition of considering the implementation of the common control strategy, wherein the calculation method of the additional control strategy comprises the following steps:
6-2-1) and considering the influence of a public control strategy, and carrying out safety and stability evaluation on the sequential event sequence. Safety margin y if successive event sequences nnIf the value is more than or equal to 0, the additional control strategy does not need to be calculated; safety margin y if successive event sequences nn<0, then needing to calculate an additional control strategy and executing 6-2-2);
6-2-2) calculating the required additional control strategy for the successive event sequence n with the safety stability margin less than 0 after the public control strategy is implemented. Taking the successive events and common control strategy actions contained by the same as initial conditions; after the last event of the successive event, implementing a candidate control strategy, i.e. the safety control device judges t after the last event of the successive eventnpriStarting to implement the additional control strategy; for the candidate control object set allowed by the successive event, the control object contained in the common control strategy is removed, the candidate control object set of the additional control strategy is calculated as the successive event sequence, and the safety margin of the optimized calculation successive event sequence n meets the requirement (for example, gammanNot less than 0) to obtain unique additional control strategy C thereofpri。
It should be noted that: when calculating the emergency control strategy, t is notnpriThe implementation time of emergency control measures such as switching off and switching on load is added with the device processing and communication delay, and the implementation time of measures such as switching off and switching on load can be taken as the effective time of the measures such as switching off and switching on load.
Step 7 depicted in fig. 1 is a control strategy that forms a sequence of successive events.
For each successive sequence of events n for which safety and stability control needs to be implemented, the action time t will be includedcomAnd control strategy CcomAnd includes an action time tnpriAnd control strategy CpriAnd (4) performing superposition to form a complete control strategy, thereby obtaining emergency control measures to be implemented at each stage of the successive event sequence.
It should be noted that each successive event sequence may have a common control strategy with multiple phases, and the merging is performed in time sequence and in phases to avoid omission.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of emergency control strategy computation for handling dynamic process succession events, the method comprising the steps of:
acquiring basic information, wherein the basic information comprises: initial event information and dynamic process succession event information;
analyzing the time sequence of the occurrence of successive events in the dynamic process after the initial event to form a successive event sequence information table;
performing safety and stability evaluation according to the information table of the successive event sequences to obtain the safety and stability margin of each successive event sequence;
analyzing and calculating a safety and stability emergency control strategy of a successive event sequence with the safety and stability margin not meeting the requirement to form an emergency control measure table of the successive event sequence;
performing successive event sequence control measure compatibility analysis on each control object according to the successive event sequence emergency control measure table;
according to the compatibility analysis result, carrying out public control strategy calculation on the successive event sequence to obtain a public control strategy and public control strategy control time;
considering the influence of a common control strategy, performing additional control strategy calculation on the successive event sequences to obtain an additional control strategy and additional control strategy control time;
and uniformly merging the public control strategy and the additional control strategy of each successive event sequence needing to implement safety and stability control according to time sequence and stages to form a complete emergency control strategy.
2. An emergency control strategy calculation method to handle dynamic process succession events according to claim 1, characterized in that the dynamic process succession event information comprises: successive event type, location and time of occurrence;
the successive event types include: fault information, relay protection action information, safety automatic device action information and power electronic equipment operation state change information.
3. The method of claim 1, wherein the sequence of events information table comprises: the total number of time periods of the sequence of successive events, the time at which each time period event occurred, and event description information for each time period.
4. An emergency control strategy calculation method to cope with dynamic process succession events according to claim 1, characterized in that the safety margin acquisition method comprises:
for the successive event sequence, forming an expected fault required by safety stability evaluation calculation based on the initial event information and the successive event sequence information table;
and on the premise of not taking emergency control measures in the whole process, based on safety and stability simulation calculation data, adopting power system safety and stability quantitative analysis software to obtain the safety and stability margin of each successive event sequence.
5. The method of claim 1, wherein the step of forming a table of successive event sequence emergency control measures comprises:
forming expected faults required by safety and stability evaluation calculation for each successive event sequence based on the initial event information and the successive event sequence information table;
and performing control strategy calculation based on the safety and stability simulation calculation data and the candidate control measure information under the condition that the emergency control strategy is implemented by starting at the last event occurrence time of the successive event sequence to form an emergency control measure table of the successive event sequence.
6. An emergency control strategy calculation method to cope with dynamic process succession events according to claim 1, characterized in that the method of common control strategy calculation comprises the steps of:
identifying a compatible sequential event sequence set of each control object according to the sequential event sequence compatibility analysis result;
determining the control time of the common control strategy of each successive event sequence in the compatible successive event sequence set;
determining candidate control objects of a common control strategy according to the compatible successive event sequence sets of the control objects;
and analyzing and calculating a control strategy which is acceptable for all the successive event sequences in the successive event sequence set according to the control time of the common control strategy and the candidate control object, and taking the control strategy as the common control strategy of the successive event sequence set.
7. An emergency control strategy computation method of handling dynamic process succession events according to claim 6, characterized in that the method of identifying a compatible set of succession event sequences comprises:
and comparing and analyzing the successive event sequence sets compatible with the candidate control objects, screening out the control object with the maximum number of compatible successive event sequences, and judging the corresponding compatible successive event sequence set as the compatible successive event sequence set.
8. An emergency control strategy calculation method to cope with dynamic process succession events according to claim 6, characterized in that the method of determining the control time of a common control strategy comprises:
analysis of the time t at which the last identical event occurred within a statistically compatible set of consecutive event sequencesc1And the earliest time t at which a different event occursc2Control time t of a common control strategycomThe value-taking principle is as follows:
tc1<tcom<tc2。
9. the emergency control strategy calculation method of coping with dynamic process succession events according to claim 6, wherein the method of determining the candidate control objects of the common control strategy comprises:
according to the successive event sequence set CRC (k,1) compatible with each control object, searching each control object k compatible with all the successive event sequences in the corresponding compatible successive event sequence setcControl object kcNamely candidate control objects; wherein k iscThe following conditions are satisfied:
CRC(kc,1)＝CRC(k0,1)；
in the formula, k0 represents the control object with the largest number of compatible sequences of consecutive events.
10. The method of claim 1 for emergency control strategy calculation for handling dynamic process succession events, wherein the method of appending control strategy calculations comprises:
and considering the influence of a common control strategy, and performing safety and stability evaluation on the sequential event sequence:
if the safety stability margin of the sequence of the successive events meets the requirement, the additional control strategy does not need to be calculated;
if the safety stability margin of the sequence of successive events does not meet the requirement, an additional control strategy needs to be calculated, and the following steps are carried out:
after the public control strategy is implemented, taking the successive events and the public control strategy action contained in the successive event sequence with the safety stability margin not meeting the requirement as initial conditions;
implementing the candidate control strategy after the last event of the contained successive events;
and removing the control objects contained in the common control strategy from the candidate control object set allowed by the contained successive events, calculating the candidate control object set of the additional control strategy as the successive event sequence, and optimizing the control strategy which meets the requirement of the safety stability margin in the calculated successive event sequence, thereby obtaining the unique additional control strategy.
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