CN110690703A - Fault defense online policy table generation method, online safety and stability emergency control method and system - Google Patents
Fault defense online policy table generation method, online safety and stability emergency control method and system Download PDFInfo
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Abstract
The invention discloses a fault defense online strategy table generation method, an online safety and stability emergency control method and a system suitable for equipment switching. On the premise of not sacrificing decision speed and precision, the invention solves the problem of mismatching of the on-line emergency control strategy to equipment on-off change by generating a plurality of groups of on-line strategies covering the strategy mode and associating the on-off state of the power grid equipment, improves the adaptability and reliability of the on-line emergency control strategy and meets the practical requirement of on-line emergency control.
Description
Technical Field
The invention relates to the technical field of safety and stability control of a power system, in particular to a method for generating a fault defense online policy table adaptive to equipment switching, and a method and a system for online safety and stability emergency control.
Background
After the electric power system safety and stability emergency control device detects that a fault occurs, corresponding control measures are executed through matching of a power grid operation mode and the fault based on the emergency control strategy table, and the safety and stability operation of a power grid after a serious fault is guaranteed. The existing emergency control strategy comprises an offline strategy and an online strategy, the offline emergency control strategy has the risk of being uneconomical and uncontrollable due to excessive control because of the difference between an offline typical mode and an actual operation mode, and the safety of a power grid cannot be ensured, the online emergency control strategy carries out emergency control pre-decision based on the online actual operation mode, so that the adaptability of the control strategy to the operation mode of the power grid is effectively improved, but the online emergency control strategy carries out pre-decision before failure, if the switching state of power grid operation equipment associated with the control strategy mode changes from the decision time to the failure occurrence time, the online emergency control strategy has mismatch risk, particularly under the conditions of current electric power market transaction propulsion and large-scale new energy grid connection, the operation mode of an alternating current-direct current hybrid power grid is complex, and planned equipment and unplanned equipment are more and more frequently switched, the mismatch risk of the online emergency control strategy is increased, an online safe and stable emergency control decision adapting to equipment switching needs to be carried out, and the reliability of online emergency control is improved.
Although the existing method improves the reliability of online emergency control under the condition that the on-off state of the power grid operation equipment associated with the control strategy mode is consistent with the decision time through online addition and advanced decision and the comprehensive optimization decision of the transient static safety and stability problem, when the on-off state of the power grid operation equipment associated with the strategy mode at the fault occurrence time is changed, the online emergency control strategy still has mismatch risk, and the practical requirement of online emergency control is difficult to meet.
Disclosure of Invention
The invention aims to provide a fault defense online strategy table generation method, an online safety and stability emergency control method and a system which are suitable for equipment switching, and the emergency control strategy calculation is carried out by combining the current running state and the expected state of a power grid, so that each associated equipment has a corresponding emergency control strategy in different switching states when a fault occurs, and the reliability of the online emergency control strategy is improved.
The technical scheme adopted by the invention is as follows:
in one aspect, the present invention provides a method for generating a failure defense online policy table, including:
obtaining current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
carrying out power flow calculation on the basis of the acquired information to obtain expected operation state data of the power grid: if the on-off change of the associated equipment exists in the preset future time period, respectively calculating to obtain the expected operation state S of the power grid after the on-off change of the corresponding associated equipmenti(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
respectively aiming at the running state S of the power grid according to a preset actual defense fault determination rule based on the expected fault F0、S1、S2、...、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、...、Fk；
Based on the preset controllable measure set of the expected failure F, generating rules according to preset actual controllable measures, and respectively aiming at the expected failure F of each actual defense0、F1、F2、...、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、...、Ck；
Respectively aiming at the running state of each power grid, calculating an online emergency control strategy C of the expected failure of each actual defense based on the actual controllable measure set0.F、C1.F、C2.F、...、Ck.F；
An online policy table for defending against the fault F at the current time is generated as [ (D)0，F0，C0.F)，(D1，F1，C1.F)，(D2，F2，C2.F)，...，(Dk，Fk，Ck.F)]Wherein D is0、D1、D2、...、DkRespectively correspond to the characteristics S0、S1、S2、...、SkThe state of the associated device.
Optionally, defining: the current time is t0The current grid operating state is recorded as S0For an expected fault F, recording a set of power grid operation equipment which is used for judging the power grid operation mode and is associated with the safety and stability control offline strategy table for defending the fault as A;
according to a scheduling plan, if the equipment in the A is changed in the preset future time period, recording a set formed by the equipment with changed switching in the A as A1, wherein m is the number of the equipment in the A1, and recording switching serial numbers and switching states of the equipment in the A1 according to the time sequence; otherwise, will t0The set of devices in the commissioning state at time a is denoted as a2, and n is the number of devices in a 2.
Optionally, according to the scheduling plan, a plurality of devices which are simultaneously invested or quit are recorded into the corresponding set as a combined device.
Optionally, the preset future period is (t)0，t0+2T+aT]And a time interval, wherein T is the average refreshing time of the online control strategy, and a is a preset parameter which is less than 1 and greater than 0.
Optionally, T is taken (T)0-ΔT，t0) And when the historical data time length is less than the delta T, the T is taken as a design value of the refreshing time interval of the online policy table.
Optionally, for a situation that there is a change in the throw-back of the associated device within a preset future time period, based on S0And (4) carrying out load flow calculation to respectively obtain the expected operation states of the power grid after the devices in the A1 are sequentially put in or withdrawn one by one, and recording as S1、S2、...、Sm，k＝m；
For the situation that the change of the on/off of the associated equipment does not exist in the preset future time period, based on S0And (4) respectively obtaining expected operation states of the power grid after the equipment in the A2 quits through load flow calculation, and recording the expected operation states as S1、S2、...、Sn，k＝n。
Optionally, the preset actual defense fault determination rule is as follows: if at least one device of the fault devices in the fault F is in the exit state in a certain power grid operation state, the expected fault of actual defense is not existed in the corresponding power grid operation state, otherwise, the actual defense expected fault in the corresponding power grid operation state is the fault F. The rule is set in consideration of the influence of human factors on the state of the fault-related equipment, and if the fault-related circuit breaker is manually operated to exit, online defense against the fault F is not required to be considered at the moment.
Optionally, the preset actual controllable measure generation rule is as follows: expected failure F for any actual defenseiCorresponding grid operating state SiLower practically controllable measure CiIncluding presetting a set of controllable measures, removing control measures associated with the de-associated device, and t0Controllable measures other than those that cannot be implemented at the moment.
The method for generating the fault defense online strategy table can solve the problem of mismatch of the online emergency control strategy when the switching state of the power grid operation equipment is changed, wherein the mismatch is related to the strategy mode at the fault occurrence moment and the decision moment, and can effectively improve the adaptability of the online emergency control strategy to the switching state change of the equipment.
In a second aspect, the present invention further provides a device for generating a failure defense online policy table, including:
a data collection module for obtaining the current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
the load flow calculation module is used for carrying out power grid load flow calculation based on the acquired information to obtain power grid expected operation state data: if the on-off change of the associated equipment exists in the preset future time period, respectively calculating to obtain the expected operation state S of the power grid after the on-off change of the corresponding associated equipmenti(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
an actual expected fault determination module, configured to determine, based on the expected fault F and according to a preset actual defense fault determination rule, the power grid operating state S0、S1、S2、...、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、...、Fk；
An actual controllable measure calculation module, configured to generate rules according to preset actual controllable measures based on a preset controllable measure set of the expected failure F, and respectively aim at each actually defended expected failure F0、F1、F2、...、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、...、Ck；
An emergency control strategy calculation module used for calculating an on-line emergency control strategy C of expected faults of each actual defense based on the actual controllable measure set aiming at the operation state of each power grid respectively0.F、C1.F、C2.F、...、Ck.F；
And the online strategy table generating module is used for generating the current timeAn online policy table for defense against failure F is [ (D)0，F0，C0.F)，(D1，F1，C1.F)，(D2，F2，C2.F)，...，(Dk，Fk，Ck.F)]Wherein D is0、D1、D2、...、DkRespectively correspond to the characteristics S0、S1、S2、...、SkThe state of the associated device.
In a third aspect, the present invention provides an online safety and emergency control method for a control station in a safety and emergency control device, based on the method for generating a failure defense online policy table in the first aspect, including:
collecting power grid operation state information, and generating a power grid operation mode and a controllable measure set C related to a safety and stability control offline strategy table;
acquiring online policy table information of each expected fault in real time according to a preset refreshing period, wherein the online policy table is generated according to the fault defense online policy table generation method of the first aspect;
and responding to the expected failure of the power grid, and selecting an online safety and stability emergency control according to an online emergency control strategy table or an offline strategy table according to a preset strategy selection rule.
Optionally, the preset policy selection rule is: judging whether the following three conditions are met simultaneously:
a) the time length from the time corresponding to the online policy table to the expected failure occurrence time is less than the set effective time length of the online policy table;
b) before an expected fault occurs, in a newly generated power grid operation mode associated equipment set related to the offline policy table, the switching-on/off states of all the equipment are completely consistent with the switching-on/off states of the equipment of one online policy group in the online policy table;
c) the control measure set corresponding to the online strategy belongs to a controllable measure set C;
if the three conditions are met simultaneously, selecting an online emergency control strategy table which is acquired at the corresponding moment and corresponds to the corresponding expected failure, and generating a control command according to the online emergency control strategy;
and if any condition is not met, searching an offline strategy generation control command corresponding to the fault from the offline strategy table according to the latest generated power grid operation mode and the controllable measure set C related to the offline strategy table before the fault occurs.
In a fourth aspect, the present invention further provides an online safety and stability emergency control system based on the online safety and stability emergency control method in the third aspect, including a failure defense online policy table generating device and a safety and stability emergency control device, where the safety and stability emergency control device includes a control station device and an execution station device;
the fault defense online strategy table generating device acquires the power grid running state generated by the energy management system of the control center and the running state information sent by the safety and stability emergency control device in real time, and generates a fault defense online strategy table according to the fault defense online strategy table generating method;
the control station device of the safety and stability emergency control device comprises a data collecting and uploading module, an online policy table acquiring module, a fault judging module and a control command generating module; the data collecting module and the uploading module collect the power grid operation state information, generate a power grid operation mode and a controllable measure set related to the safety and stability control offline strategy table, and upload the power grid operation mode and the controllable measure set to the fault defense online strategy table generating device; the online strategy table acquisition module acquires a fault defense online strategy table from a fault defense online strategy table generation device, the fault judgment module judges whether an expected fault of a power grid occurs in real time, and the control command generation module selects a control command for performing online safe and stable emergency control according to a preset strategy selection rule when responding to the expected fault of the power grid;
the execution station device of the safety and stability emergency control device comprises a data acquisition uploading module and a control command execution module; the data acquisition uploading module acquires the running state information of equipment in the station and uploads the running state information to the control station device; and the control command execution module implements emergency control on the corresponding controllable equipment according to the control command.
Advantageous effects
The invention generates the power grid expected state after the equipment is sequentially switched on and off one by one according to the switching-on and switching-off sequence of the equipment in the scheduling plan defined by the way of the off-line strategy table based on the current state of the power grid through load flow calculation, or generating the expected states of the power grid after the equipment exits one by one in the way of the off-line strategy table in the current state, respectively calculating the online strategies corresponding to the faults in the offline strategy table in the current state and each expected state of the power grid, generating a plurality of groups of online strategies including the switching state and the faults of the equipment in a certain power grid state and the online strategies of the equipment in the power grid state in an offline strategy table mode, searching the online strategy of the fault from the online strategy table according to the matching of the on-off state of the equipment before the fault as an online emergency control strategy, when a fault occurs, each associated device has a corresponding online emergency control strategy in different switching states. Compared with the prior art, the method and the device have the advantages that on the premise of not sacrificing decision speed and accuracy, the problem of mismatching of the online emergency control strategy to the equipment switching change is solved by generating the multiple groups of online strategies covering the switching states of the power grid equipment in a strategy mode, the adaptability and the reliability of the online emergency control strategy are improved, and the practical requirement of the online emergency control is met.
Drawings
Fig. 1 is a schematic flow chart of an embodiment of a method for generating an online policy table according to the present invention.
Detailed Description
The following further description is made in conjunction with the accompanying drawings and the specific embodiments.
Example 1
The embodiment is a method for generating a fault defense online policy table, which includes:
obtaining current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
power grid load flow calculation based on acquired informationAnd obtaining the expected operation state data of the power grid: if the on-off change of the associated equipment exists in the preset future time period, respectively calculating to obtain the expected operation state S of the power grid after the on-off change of the corresponding associated equipmenti(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
respectively aiming at the running state S of the power grid according to a preset actual defense fault determination rule based on the expected fault F0、S1、S2、...、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、...、Fk；
Based on the preset controllable measure set of the expected failure F, generating rules according to preset actual controllable measures, and respectively aiming at the expected failure F of each actual defense0、F1、F2、...、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、...、Ck；
Respectively aiming at the running state of each power grid, calculating an online emergency control strategy C of the expected failure of each actual defense based on the actual controllable measure set0.F、C1.F、C2.F、...、Ck.F；
An online policy table for defending against the fault F at the current time is generated as [ (D)0，F0，C0.F)，(D1，F1，C1.F)，(D2，F2，C2.F)，...，(Dk，Fk，Ck.F)]Wherein D is0、D1、D2、...、DkRespectively correspond to the characteristics S0、S1、S2、...、SkThe state of the associated device.
Examples 1 to 1
Based on embodiment 1, referring to fig. 1, in the method for generating a failure defense online policy table according to this embodiment, the following definitions are defined: the current time ist0The current grid operating state is recorded as S0For an expected fault F, recording a set of power grid operation equipment which is used for judging the power grid operation mode and is associated with the safety and stability control offline strategy table for defending the fault as A;
according to a scheduling plan, if the equipment in the A is changed in the preset future time period, recording a set formed by the equipment with changed switching in the A as A1, wherein m is the number of the equipment in the A1, and recording switching serial numbers and switching states of the equipment in the A1 according to the time sequence; otherwise, will t0The set of devices in the commissioning state at time a is denoted as a2, and n is the number of devices in a 2.
According to the scheduling plan, a plurality of devices which are simultaneously input or simultaneously output are recorded into a corresponding set as a combined device.
The preset future period is (t)0，t0+2T+aT]And a time interval, wherein T is the average refreshing time of the online control strategy, and a is a preset parameter which is less than 1 and greater than 0. Tdesired (T)0-ΔT，t0) And when the historical data time length is less than the delta T, the T is taken as a design value of the refreshing time interval of the online policy table.
For the situation that the change of the throw-back of the associated equipment exists in the preset future period, based on S0And (4) carrying out load flow calculation to respectively obtain the expected operation states of the power grid after the devices in the A1 are sequentially put in or withdrawn one by one, and recording as S1、S2、...、Sm，k＝m；
For the situation that the change of the on/off of the associated equipment does not exist in the preset future time period, based on S0And (4) respectively obtaining expected operation states of the power grid after the equipment in the A2 quits through load flow calculation, and recording the expected operation states as S1、S2、...、Sn，k＝n。
The preset actual defense fault determination rule is as follows: if at least one device of the fault devices in the fault F is in the exit state in a certain power grid operation state, the expected fault of actual defense is not existed in the corresponding power grid operation state, otherwise, the actual defense expected fault in the corresponding power grid operation state is the fault F. The rule is set in consideration of the influence of human factors on the state of the fault-related equipment, and if the fault-related circuit breaker is manually operated to exit, online defense against the fault F is not required to be considered at the moment.
The preset actual controllable measure generation rule is as follows: expected failure F for any actual defenseiCorresponding grid operating state SiLower practically controllable measure CiIncluding presetting a set of controllable measures, removing control measures associated with the de-associated device, and t0Controllable measures other than those that cannot be implemented at the moment.
Example 2
Based on the same inventive concept as embodiment 1, this embodiment is a device for generating a failure defense online policy table, including:
a data collection module for obtaining the current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
the load flow calculation module is used for carrying out power grid load flow calculation based on the acquired information to obtain power grid expected operation state data: if the on-off change of the associated equipment exists in the preset future time period, respectively calculating to obtain the expected operation state S of the power grid after the on-off change of the corresponding associated equipmenti(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
an actual expected fault determination module, configured to determine, based on the expected fault F and according to a preset actual defense fault determination rule, the power grid operating state S0、S1、S2、...、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、...、Fk；
Actual controllable measure calculation module, usingRespectively aiming at the expected faults F of each actual defense according to the preset actual controllable measure generation rule in the preset controllable measure set based on the expected faults F0、F1、F2、...、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、...、Ck；
An emergency control strategy calculation module used for calculating an on-line emergency control strategy C of expected faults of each actual defense based on the actual controllable measure set aiming at the operation state of each power grid respectively0.F、C1.F、C2.F、...、Ck.F；
And an online policy table generating module for generating an online policy table for defending against the fault F at the current time, which is [ (D)0，F0，C0.F)，(D1，F1，C1.F)，(D2，F2，C2.F)，...，(Dk，Fk，Ck.F)]Wherein D is0、D1、D2、...、DkRespectively correspond to the characteristics S0、S1、S2、...、SkThe state of the associated device.
The specific function of each functional module in the device of the embodiment is realized by referring to embodiment 1 and embodiment 1-1.
Example 3
The present embodiment is an online safety and stability emergency control method based on the method for generating the failure defense online policy table in embodiment 1, which is used for a control station in a safety and stability emergency control device, and includes:
collecting power grid operation state information, and generating a power grid operation mode and a controllable measure set C related to a safety and stability control offline strategy table;
acquiring online policy table information of each expected fault in real time according to a preset refreshing period, wherein the online policy table is generated according to the fault defense online policy table generation method of the first aspect;
and responding to the expected failure of the power grid, and selecting an online safety and stability emergency control according to an online emergency control strategy table or an offline strategy table according to a preset strategy selection rule.
The collected power grid operating state information, the power grid operating mode and the controllable measure set C related to the generated offline policy table are uploaded to an online policy table generating device that executes an online policy table generating method, such as the online policy table generating device shown in embodiment 2.
The preset policy selection rule is as follows: judging whether the following three conditions are met simultaneously:
a) the time length from the time corresponding to the online policy table to the expected failure occurrence time is less than the set effective time length of the online policy table;
b) before an expected fault occurs, in a newly generated power grid operation mode associated equipment set related to the offline policy table, the switching-on/off states of all the equipment are completely consistent with the switching-on/off states of the equipment of one online policy group in the online policy table;
c) the control measure set corresponding to the online strategy belongs to a controllable measure set C;
if the three conditions are met simultaneously, selecting an online emergency control strategy table which is acquired at the corresponding moment and corresponds to the corresponding expected failure, and generating a control command according to the online emergency control strategy;
and if any condition is not met, searching an offline strategy generation control command corresponding to the fault from the offline strategy table according to the latest generated power grid operation mode and the controllable measure set C related to the offline strategy table before the fault occurs.
Example 4
The embodiment is an online safety and stability emergency control system based on the online safety and stability emergency control method in embodiment 1, and the online safety and stability emergency control system includes a failure defense online policy table generating device and a safety and stability emergency control device, where the safety and stability emergency control device includes a control station device and an execution station device; the failure prevention online policy table generating device may be the device of embodiment 2, and the control station device of the safety and stability emergency control device executes the control method of embodiment 3.
The fault defense online strategy table generating device acquires the power grid running state generated by the energy management system of the control center and the running state information sent by the safety and stability emergency control device in real time, and generates a fault defense online strategy table according to the fault defense online strategy table generating method;
the control station device of the safety and stability emergency control device comprises a data collecting and uploading module, an online policy table acquiring module, a fault judging module and a control command generating module; the data collecting module and the uploading module collect the power grid operation state information, generate a power grid operation mode and a controllable measure set related to the safety and stability control offline strategy table, and upload the power grid operation mode and the controllable measure set to the fault defense online strategy table generating device; the online strategy table acquisition module acquires a fault defense online strategy table from a fault defense online strategy table generation device, the fault judgment module judges whether an expected fault of a power grid occurs in real time, and the control command generation module selects a control command for performing online safe and stable emergency control according to a preset strategy selection rule when responding to the expected fault of the power grid;
the execution station device of the safety and stability emergency control device comprises a data acquisition uploading module and a control command execution module; the data acquisition uploading module acquires the running state information of equipment in the station and uploads the running state information to the control station device; and the control command execution module implements emergency control on the corresponding controllable equipment according to the control command.
Example 4-1
Based on embodiment 4, the inventive concept of this embodiment is: the method comprises the steps of firstly obtaining the current state of a power grid from an energy management system of a regulation and control center, obtaining power grid equipment and actual controllable measures related to each defense fault control strategy mode of an offline strategy table from running state information sent by a safety and stability emergency control device, and adopting a parallel processing mode for each defense fault. Acquiring a strategy mode from a scheduling plan system for each defense fault to associate the switching sequence and the switching state of the power grid equipment, and generating power grid forecast states after the equipment is switched on and off one by one in an off-line strategy table mode according to the switching sequence of the equipment in the scheduling plan or generating power grid forecast states after the equipment is switched off one by one in an off-line strategy table mode in the current state based on the current state of the power grid through load flow calculation; then, based on the power grid expected state after the associated power grid equipment is switched back, identifying the effectiveness of the defense fault in each power grid expected state, and generating a controllable measure set of the defense fault in each power grid expected state by combining with the running state information sent by the safety and stability emergency control device; on the basis, further calculating the online strategies for defending faults in the offline strategy table under the current state and each expected state of the power grid, and generating a plurality of groups of online strategies including the switching state, the faults and the online strategies under the power grid state of the equipment defined in the offline strategy table mode; and finally, searching the corresponding online strategy of the fault from the online strategy table according to the matching of the on-off state of the equipment before the fault after the fault occurs, and taking the online strategy as the strategy for executing the online emergency control.
The principle of the online safety and stability emergency control system is specifically explained below, and the system for realizing online safety and stability emergency control comprises an online strategy table generation device installed in a regulation center and a safety and stability emergency control device installed in a plant station.
The online strategy table generating process of the online strategy table generating device comprises the following steps:
s1: let the current time be t0Will t0The running state of the power grid is recorded as S0Setting the average time length of the online strategy refreshing as T, recording a set of power grid operation equipment associated with the power grid operation mode judgment in a safety and stability control device offline strategy table for defending a certain expected fault F as A, and if the set is in (T)0，t0+2T+aT]Recording a set formed by corresponding equipment with changed throwing and withdrawing in A as A1, wherein m is the number of the equipment in A1, recording throwing and withdrawing serial numbers and throwing and withdrawing states of the equipment in A1 according to time sequence in step S2, otherwise, recording t0The set of devices in the commissioning state at time a is denoted as a2, n is the number of devices in a2, and the process proceeds to step S3, where a is a set parameter smaller than 1 and larger than 0, and usually takes a value of 0.5.
Wherein T is (T)0-ΔT，t0) The average value of the online policy table refresh time interval within the period, Δ T, is typically set to 24 hours, and when the historical data duration is less than Δ T, T is taken as the design value of the online policy table refresh time interval (may be taken to be 5 minutes).
Further, a plurality of devices scheduled to be simultaneously invested or simultaneously exited according to the schedule plan are treated as one combined device in the same manner as a single device.
S2: according to the throwing and returning serial numbers and throwing and returning states of the equipment in A1, based on S0Generating expected operation states of the power grid after the devices in the A1 are sequentially put in or withdrawn one by one through load flow calculation, and recording the expected operation states as S1、S2、...、SmThe process proceeds to step S4.
S3: based on S0Generating expected operation states of the power grid after the devices in the A2 respectively quit through load flow calculation, and recording the expected operation states as S1、S2、...、Sn。
S4: if m is greater than 0, let k equal m, otherwise let k equal n.
S5: based on F, for S respectively0、S1、S2、...、SkGenerating an expected failure of the safety and stability control device in the corresponding power grid running state, and recording the expected failure as F0、F1、F2、...、Fk。
If at least one device in the F is in an exit state in a certain power grid operation state, the expected failure of actual defense in the power grid operation state is considered, otherwise, the expected failure of actual defense in the power grid operation state is considered to be F.
S6: f-based preset controllable measure set, considering t0The running states of the safety and stability control device at all times are respectively corresponding to S0、S1、S2、...、SkLower corresponding to F0、F1、F2、...、FkGenerating a measure set C of the safety and stability control device which is actually controllable in the corresponding power grid running state and respectively marked as C0、C1、C2、...、Ck。
Specifically, for a certain power grid operation state, the control measures related to quitting equipment in the preset controllable measures are firstly removed, and then the control measures are removed according to t0And eliminating the control measures which cannot be controlled by the safety and stability control device at any moment in the running state to generate an actually controllable measure set in the running state of the power grid.
S7: respectively for S0、S1、S2、...、SkAccordingly at C0、C1、C2、...、CkCalculating corresponding F in represented decision space0、F1、F2、...、FkEmergency control on-line strategy of (1), denoted as C0.F、C1.F、C2.F、...、Ck.F。
S8: will [ (D)0，F0，C0.F)，(D1，F1，C1.F)，(D2，F2，C2.F)，...，(Dk，Fk，Ck.F)]As an online policy table of the defense F of the safety and stability control device, and t0As the corresponding time of the online policy table, wherein D0、D1、D2、...、DkRespectively represent S0、S1、S2、...、SkCorresponding to the on/off state of each device in A.
If there is no predicted failure of actual defense in a certain power grid operating state in S6-S8, it is not necessary to generate a corresponding actual controllable measure set, and it is also not necessary to perform corresponding emergency control online policy calculation, and to generate related information in an online policy table.
The online strategy table generating device comprises a data collecting module, an online strategy table calculating module and an online strategy table generating module;
a data collection module: t generated by energy management system of convergence control center0The running state information sent by the safety and stability emergency control device and the running state information of the power grid are sent at all times;
an online policy table calculation module: for calculating t0The method comprises the steps of generating an online strategy table including an equipment on-off state, an expected fault and an online strategy according to the structure of the online strategy table, and taking the online strategy corresponding to the equipment on-off state and the expected fault as a group of online strategies in the online strategy table;
an online policy table generation module: and immediately issuing the corresponding online policy table to a safety and stability emergency control device for defending the expected faults in the online policy table after the online policy table is generated by the online policy table calculation module.
The online policy table generating device may be the online policy table generating device of embodiment 2, and the online policy table calculating module may be a combination of the power flow calculating module, the actual expected failure determining module, the actual controllable measure calculating module, and the emergency control policy calculating module in embodiment 2.
The safety and stability emergency control device comprises a control station device and an execution station device:
1) the control station device comprises a data collection module, namely an uploading module, an online policy table receiving module, a fault judgment module, a control command generation module and a control command sending module;
data collection and module: the system comprises a control station device, a safety and stability control device, a control station device, a control strategy table and a control strategy table, wherein the control station device is used for acquiring the running state of the equipment of the station, collecting information from other control station devices and execution station devices, and generating a power grid running mode and a controllable measure set C related to the safety and stability control device offline strategy table; the generated data and the running state of the device are sent to an online strategy table generating device;
an online policy table acquisition module: the online policy table is used for acquiring the online policy table and recording the corresponding time of the online policy table;
a fault judgment module: the system is used for judging whether a defensive fault F occurs or not according to the information obtained by the data acquisition and collection module;
a control command generation module: the fault judging module is used for immediately carrying out the following processing after judging that the power grid has a defensive fault F:
if the online strategy table simultaneously meets the following three conditions a) to C), taking the online strategy as a control command, otherwise, searching an offline strategy corresponding to the F from the offline strategy table as the control command according to a power grid operation mode and C which are newly generated by the data acquisition and collection module before the F occurs and are related to the offline strategy table of the safety and stability control device;
a) the time length from the moment corresponding to the online policy table to the occurrence moment of F is less than the set effective time length of the online policy table (preferably 10 minutes);
b) the equipment switching state of all equipment in the A in the power grid operation mode which is newly generated by the data acquisition and collection module before the occurrence of the F and is related to the safety and stability control device off-line strategy table is completely consistent with the equipment switching state of one on-line strategy group in the on-line strategy table;
c) and C, the control measure set corresponding to the searched online strategy belongs to C.
A control command sending module: the control command generating module is used for generating a control command according to the received control command;
the execution station device comprises a data acquisition uploading module and a control command execution module;
data acquisition and uploading module: the system is used for acquiring the running state of the controllable equipment of the station and sending the acquired information and the running state of the device to the control station device;
a control command execution module: the system is used for receiving the control command sent by the control station and implementing emergency control on the controllable equipment according to the control command.
In summary, the invention performs load flow calculation on the associated equipment defined in the offline policy table mode based on the current operation state of the power grid in combination with the scheduling plan information, generates the expected power grid state after the associated equipment is switched back, and performs emergency control policy calculation for preventing faults aiming at the expected power grid state, so that each associated equipment has a corresponding online emergency control policy in different switching states when faults occur, and the adaptability and reliability of the online emergency control policy can be effectively improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for generating a fault defense online policy table is characterized by comprising the following steps:
obtaining current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
carrying out power flow calculation on the basis of the acquired information to obtain expected operation state data of the power grid: if the on-off change of the associated equipment exists in the preset future time period, respectively calculating to obtain the expected operation state S of the power grid after the on-off change of the corresponding associated equipmenti(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
respectively aiming at the running state S of the power grid according to a preset actual defense fault determination rule based on the expected fault F0、S1、S2、…、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、…、Fk；
Based on the preset controllable measure set of the expected failure F, generating rules according to preset actual controllable measures, and respectively aiming at the expected failure F of each actual defense0、F1、F2、…、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、…、Ck；
Calculating the online emergency control of the expected faults of each actual defense respectively aiming at the running state of each power grid and based on the actual controllable measure setStrategy C0，F、C1，F、C2，F、…、Ck.F；
An online policy table for defending against the fault F at the current time is generated as [ (D)0,F0，C0.F),(D1,F1，C1.F),(D2,F2，C2.F),…,(Dk,Fk，Ck.F)]Wherein D is0、D1、D2、…、DkRespectively correspond to the characteristics S0、S1、S2、…、SkThe state of the associated device.
2. The method of claim 1, wherein: the current time is t0The current grid operating state is recorded as S0For an expected fault F, recording a set of power grid operation equipment which is used for judging the power grid operation mode and is associated with the safety and stability control offline strategy table for defending the fault as A;
according to a scheduling plan, if the equipment in the A is changed in the preset future time period, recording a set formed by the equipment with changed switching in the A as A1, wherein m is the number of the equipment in the A1, and recording switching serial numbers and switching states of the equipment in the A1 according to the time sequence; otherwise, will t0The set of devices in the commissioning state at time a is denoted as a2, and n is the number of devices in a 2.
3. A method according to claim 1 or 2, characterized by entering a plurality of devices simultaneously invested or simultaneously withdrawn as a combined device into the respective set according to the scheduling plan;
the preset future period of time is (t)0，t0+2T+aT]And a time interval, wherein T is the average refreshing time of the online control strategy, and a is a preset parameter which is less than 1 and greater than 0.
4. The method of claim 2, wherein the change in the relative device fallback over the predetermined future time period is based on S0And (4) carrying out load flow calculation to respectively obtain the expected operation states of the power grid after the devices in the A1 are sequentially put in or withdrawn one by one, and recording as S1、S2、…、Sm，k＝m；
For the situation that the change of the on/off of the associated equipment does not exist in the preset future time period, based on S0And (4) respectively obtaining expected operation states of the power grid after the equipment in the A2 quits through load flow calculation, and recording the expected operation states as S1、S2、…、Sn，k＝n。
5. The method according to claim 1 or 2, wherein the preset actual defense failure determination rule is: if at least one device of the fault devices in the fault F is in the exit state in a certain power grid operation state, the expected fault of actual defense is not existed in the corresponding power grid operation state, otherwise, the actual defense expected fault in the corresponding power grid operation state is the fault F.
6. A method according to claim 1 or 2, characterized in that the preset actual controllable measure generation rule is: expected failure F for any actual defenseiCorresponding grid operating state SiLower practically controllable measure CiIncluding presetting a set of controllable measures, removing control measures associated with the de-associated device, and t0Controllable measures other than those that cannot be implemented at the moment.
7. A device for generating a failure protection online policy table, comprising:
a data collection module for obtaining the current power grid operation state information S0And in a preset future period, the off-line strategy table corresponding to any expected fault F is used for judging the operation mode of the associated equipment and the switching state information in the dispatching plan;
the load flow calculation module is used for carrying out power grid load flow calculation based on the acquired information to obtain power grid expected operation state data: if the on-off change of the associated equipment exists in the preset future time period, the phases are respectively calculatedExpected operation state S of power grid after change of on/off of each associated devicei(ii) a Otherwise, respectively calculating to obtain the expected operation state S of the power grid after the associated equipment in the current operation state exitsiI is an integer from 1 to k, and k is the number of the expected operation states of the power grid;
an actual expected fault determination module, configured to determine, based on the expected fault F and according to a preset actual defense fault determination rule, the power grid operating state S0、S1、S2、…、SkGenerating a corresponding predicted fault F of the actual defense of the network in the operating state0、F1、F2、…、Fk；
An actual controllable measure calculation module, configured to generate rules according to preset actual controllable measures based on a preset controllable measure set of the expected failure F, and respectively aim at each actually defended expected failure F0、F1、F2、…、FkGenerating actual controllable measures C under the corresponding power grid operation state0、C1、C2、…、Ck；
An emergency control strategy calculation module used for calculating an on-line emergency control strategy C of expected faults of each actual defense based on the actual controllable measure set aiming at the operation state of each power grid respectively0.F、C1.F、C2.F、…、Ck.F；
And an online policy table generating module for generating an online policy table for defending against the fault F at the current time, which is [ (D)0,F0，C0.F),(D1,F1，C1.F),(D2,F2，C2.F),…,(Dk,Fk，Ck.F)]Wherein D is0、D1、D2、…、DkRespectively correspond to the characteristics S0、S1、S2、…、SkThe state of the associated device.
8. An online safety and stability emergency control method based on the fail-safe online policy table generating method of any one of claims 1 to 6, comprising:
collecting power grid operation state information, and generating a power grid operation mode and a controllable measure set C related to a safety and stability control offline strategy table;
acquiring online strategy table information of each expected fault in real time according to a preset refreshing period, wherein the online strategy table is generated according to the fault defense online strategy table generation method;
and responding to the expected failure of the power grid, and selecting an online safety and stability emergency control according to an online emergency control strategy table or an offline strategy table according to a preset strategy selection rule.
9. The method of claim 8, wherein the predetermined policy selection rule is: judging whether the following three conditions are met simultaneously:
a) the time length from the time corresponding to the online policy table to the expected failure occurrence time is less than the set effective time length of the online policy table;
b) before an expected fault occurs, in a newly generated power grid operation mode associated equipment set related to the offline policy table, the switching-on/off states of all the equipment are completely consistent with the switching-on/off states of the equipment of one online policy group in the online policy table;
c) the control measure set corresponding to the online strategy belongs to a controllable measure set C;
if the three conditions are met simultaneously, selecting an online emergency control strategy table which is acquired at the corresponding moment and corresponds to the corresponding expected failure, and generating a control command according to the online emergency control strategy;
and if any condition is not met, searching an offline strategy generation control command corresponding to the fault from the offline strategy table according to the latest generated power grid operation mode and the controllable measure set C related to the offline strategy table before the fault occurs.
10. An online safety and stability emergency control system based on the online safety and stability emergency control method according to claim 8 or 9, comprising a failure defense online policy table generating device and a safety and stability emergency control device, wherein the safety and stability emergency control device comprises a control station device and an execution station device;
the fault defense online strategy table generating device acquires the power grid running state generated by the energy management system of the control center and the running state information sent by the safety and stability emergency control device in real time, and generates a fault defense online strategy table according to the fault defense online strategy table generating method;
the control station device of the safety and stability emergency control device comprises a data collecting and uploading module, an online policy table acquiring module, a fault judging module and a control command generating module; the data collecting module and the uploading module collect the power grid operation state information, generate a power grid operation mode and a controllable measure set related to the safety and stability control offline strategy table, and upload the power grid operation mode and the controllable measure set to the fault defense online strategy table generating device; the online strategy table acquisition module acquires a fault defense online strategy table from a fault defense online strategy table generation device, the fault judgment module judges whether an expected fault of a power grid occurs in real time, and the control command generation module selects a control command for performing online safe and stable emergency control according to a preset strategy selection rule when responding to the expected fault of the power grid;
the execution station device of the safety and stability emergency control device comprises a data acquisition uploading module and a control command execution module; the data acquisition uploading module acquires the running state information of equipment in the station and uploads the running state information to the control station device; and the control command execution module implements emergency control on the corresponding controllable equipment according to the control command.
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