CN107342588B - Power grid frequency self-adaptive emergency control method considering power transmission section quota - Google Patents
Power grid frequency self-adaptive emergency control method considering power transmission section quota Download PDFInfo
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Abstract
The invention discloses a power grid frequency self-adaptive emergency control method considering power transmission section quota, and belongs to the technical field of safety and stability control of a power system. The method groups the controllable measures according to unit active control cost and transmission section active sensitivity, takes the minimum control cost as a target, takes the transmission section safety and stability quota constraint into consideration on the premise of keeping the total quantity of offline measures unchanged, calculates the control quantity of each controllable measure group, decomposes the controllable measure group and the control quantity thereof into specific controllable measures and control quantities thereof, and takes the controllable measures and the control quantities thereof as an emergency control online strategy. The method can check the timeliness of the online strategy, the consistency of the state of the pressing plate of the control system and the deviation degree of the total amount of the online measures and the total amount of the offline measures after the fault, select the online strategy and the offline strategy and realize the self-adaptive emergency control of the power grid frequency.
Description
Technical Field
The invention belongs to the technical field of safety and stability control of power systems, and particularly relates to a power grid frequency self-adaptive emergency control method suitable for considering safety and stability limits of a power transmission section.
Background
When the active power loss or the surplus caused by the fault accounts for the load of the power grid or the proportion of the generated power exceeds a certain range, the power grid has frequency safety problems. In order to ensure the frequency safety of the power grid after suffering from high-power impact, emergency power modulation of a direct current system between a transmitting power grid and a receiving power grid is required to be implemented as soon as possible when the high-power impact is detected, and a load or a generator is cut off so as to inhibit the rapid decrease or increase of the power grid frequency, prevent the further evolution of a fault and reduce the safety risk of fault handling.
In the literature, "design and application of a multi-direct-current feed-in receiving-end grid frequency emergency coordination control system" (power system automation, No. 8 in 2017), aiming at the problem of receiving-end grid frequency safety caused by power loss after a direct-current system fault, a grid frequency emergency control method is provided, in which the difference between the total power loss amount of the direct-current system and a set threshold is used as a control total amount, and specific measures (multi-direct-current coordination control, pumped storage switching pump control and fast switching load control) are determined according to priorities. Because the method does not check whether the safer and more stable quota of the power transmission section is caused by the trend distribution change after the implementation of specific measures on line, the safer and more stable quota of the power transmission section can be caused completely after the action of the power grid frequency emergency control system based on the off-line strategy control when the mismatching degree of the actual operation state of the power grid and the off-line research mode is large, particularly the trend difference between power grid partitions is large and the direct current system participates in the frequency emergency control.
Therefore, the invention provides an on-line strategy for calculating the emergency control of the power grid frequency by taking the minimum control cost as a target, considering the safety and stability quota constraint of the power transmission section and on the premise of keeping the total quantity of the emergency control off-line measures of the power grid frequency unchanged. The online strategy timeliness, the control system pressure plate state consistency and the deviation degree of the total online measure and the total offline measure are checked in real time after the fault, the online strategy and the offline strategy are selected, the power grid frequency self-adaptive emergency control considering the safety and stability quota of the power transmission section can be realized, and the method is not only suitable for the frequency emergency control of a receiving-end power grid, but also suitable for the frequency emergency control of a transmitting-end power grid and an independent power grid.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the method for calculating the grid frequency emergency control online strategy can take the minimization of the control cost as the target according to the active control total quantity requirement, and the safety and stability quota constraint of the transmission section into consideration, and can select the online strategy or the offline strategy for real-time control when the expected fault is detected.
The basic principle of the invention is that: under the condition that the generator composition and the load level in the power grid do not change greatly, the main factor influencing the change amplitude of the transient frequency of the power grid after the fault is that the active impact quantity brought to the power grid by the fault is not large in relation to the fault type and the place; further, under the condition that the real-time difference of the emergency control of the power grid frequency is not large, in order to reduce the change amplitude of the transient frequency of the power grid after the fault, the total active control quantity is a main parameter and has small composition relation with the measure place and the measure. However, the power flow variation of the power transmission section of the power grid is closely related to the active impact quantity, the type and the place of the fault, the control quantity of the emergency control measure of the frequency of the power grid, the place and the composition of the emergency control measure of the frequency of the power grid, and the real-time operation state of the power grid. Therefore, aiming at different faults, the active control total amount based on the offline strategy can meet the requirement of the safety and stability quota constraint of the transmission section through the optimized combination of different measures according to the real-time running state of the power grid.
Specifically, the invention is realized by adopting the following technical scheme that the method comprises an emergency control online strategy generation flow and an emergency control strategy selection flow after an expected failure occurs, wherein the emergency control online strategy generation flow and the emergency control strategy selection flow are mutually independent circulation flows,
the emergency control online strategy generation process comprises the following steps:
i-1) setting the current time of the power grid operation as t0Will t0The set formed by all expected faults defended by the self-adaptive emergency control system of the power grid frequency at the moment is recorded as F according to t0Generating a set of controllable measures and controllable quantity and unit active control cost indexes thereof and an emergency control offline value strategy of each expected fault in F according to the running state, pressing plate information, power grid actual measurement information, an offline strategy model and a fixed value of a power grid frequency self-adaptive emergency control system at any moment, calculating the offline measure active total quantity of each expected fault in F respectively, recording the set of controllable measures and controllable quantity and unit active control cost indexes thereof as C, and recording the ith expected fault t in F as T0The total active power of the instant off-line measures is recorded as Pc.iEntering the step I-2);
i-2) based on reflection of t0The direct current load flow equation of the running state of the power grid at the moment is used for respectively calculating each controllable measure pair t in the C0Active sensitivity of each scheduling monitoring power transmission section at each moment, and entering the step I-3);
i-3) combining the controllable measures satisfying the constraint condition of the formula (1) in C respectively to makeThe controllable quantity sum and the unit active control cost index average value of each controllable measure in each controllable measure group are respectively used as the controllable quantity and the unit active control cost index of the controllable measure group, and each controllable measure in each controllable measure group is used for t0The average value of the active sensitivity of the same dispatching and monitoring power transmission section at the moment is used as the controllable measure group pair t0The active sensitivity of the power transmission section is monitored by scheduling at any moment, and finally, a set consisting of each controllable measure group, the controllable quantity of each controllable measure group and the active control cost index of each unit is recorded as E, and the step I-4 is carried out;
in the formula, K is t0The number of the transmission sections is scheduled and monitored at any moment,
respectively, controllable measures j in C1、j2The unit active power control cost index of (2),
respectively, controllable measures j in C1、j2For t0active sensitivity of a power transmission section is monitored in the kth scheduling at the moment, and α and β are set parameters;
i-4) aiming at each expected fault in F, obtaining the control quantity of each controllable measure group in E corresponding to the expected fault by solving, scheduling and monitoring the constraint conditions that the transmission section has the active power not greater than the limit and the control total quantity is not less than the active total quantity of the offline measures, taking the minimum control cost as an optimization target in the controllable quantity space of each controllable measure group, decomposing each controllable measure group and the control quantity thereof into specific controllable measures and control quantities thereof, taking the controllable measures and the control quantities thereof as online measures and the control quantities thereof, and generating a power grid operation time t corresponding to the online strategy including the expected fault and the emergency control0、t0Emergency control online strategy including pressure plate information, online measure active total amount and corresponding online measure and control amount information at any momentSlightly deleting information, and returning to the step I-1);
the emergency control strategy selection process after the occurrence of the expected failure comprises the following steps:
II-1) when the expected fault defended by the power grid frequency self-adaptive emergency control system is detected, setting the occurrence time of the expected fault as t1According to t1Generating the expected fault t according to the running state, the pressing plate information, the power grid actual measurement information, the off-line strategy model and the fixed value of the power grid frequency self-adaptive emergency control system at the moment1Entering step II-2) by using the emergency control offline current value strategy at the moment;
II-2) if the detected expected fault belongs to the expected fault in the F and the power grid operation time and t corresponding to the emergency control online strategy information of the expected fault1If the time length between the two steps is less than or equal to the set effective time length threshold of the emergency control online strategy, the step II-3) is carried out, otherwise, the expected fault t is carried out1Taking the emergency control offline current value strategy at the moment as a self-adaptive emergency control strategy, and entering a step II-4);
II-3) calculating the expected failure t1The active total amount of the offline measure in the strategy of emergently controlling the offline current value is recorded as
If t1The pressing plate information of the power grid frequency self-adaptive emergency control system at the moment is consistent with the pressing plate information of the power grid running moment corresponding to the emergency control online strategy information and meets the constraint condition represented by the formula (2), all online measures and control quantity in the emergency control online strategy information of the expected fault are taken as a self-adaptive emergency control strategy, and the step II-4 is carried out, otherwise, the expected fault t is carried out1Taking the emergency control offline current value strategy at the moment as a self-adaptive emergency control strategy, and entering a step II-4);
in the formula, Pc.on.fThe active total amount of online measures in the online policy information is urgently controlled for the expected failure,mu is a set parameter;
II-4) implementing emergency control on the power grid according to the adaptive emergency control strategy, and returning to the step II-1).
The above technical solution is further characterized in that, in step I-4) of the emergency control online policy generation process, for each expected failure in F, the following steps are performed:
i-4-1) solving an optimization function represented by a formula (3) to obtain the control quantity of each controllable measure group in E corresponding to the ith expected fault in F;
in the formula, J3For the number of controllable action groups in E,
is j in E3The unit active control cost index of each controllable measure group,
to the j-th in E corresponding to the i-th expected failure in F3The amount of control of the individual controllable action groups,
is j in E3Controllable quantity of individual controllable measures, Pk.i.0Based on the reflection t0Active power of a k-th dispatching monitoring power transmission section after the ith expected fault in F obtained by calculation of a direct current power flow equation of the power grid operation state at the moment,
is j in E3A controllable measure group pair t0Active sensitivity P of power transmission section is monitored by the kth scheduling at the momentk.i.maxIs t0The limitation of the kth dispatching monitoring power transmission section corresponding to the ith expected fault in the F at the moment, wherein gamma is a set parameter;
i-4-2) aiming at each controllable measure group in E, respectively and sequentially selecting controllable measures in the corresponding controllable measure combination according to the sequence that the unit active control cost index of the controllable measure is from small to large until the sum of the controllable quantities of all the selected controllable measures is more than or equal to the online control quantity of the controllable measures, directly taking the controllable quantity of the selected controllable measure as the control quantity, updating the control quantity of the controllable measure group to the difference value of the sum of the controllable quantity of the controllable measure group and the controllable quantity of the selected 1 st to 2 nd controllable measure when the controllable measure which can be continuously controlled in the controllable quantity range is selected finally, and then taking the selected controllable measure and the control quantity thereof as the online measure and the control quantity thereof;
i-4-3) controlling the power grid operation time t corresponding to the ith expected failure and the emergency control online strategy0，t0Time of day clamp information, Pc.on.i[ (in-line measures-1, P)c.on.i，1) (on-line measures-2, P)c.on.i.2)，...，
]As the emergency control online policy information of the ith expected failure, where niThe total number of online measures for the ith expected failure,
j of the ith expected failure4Control quantity of individual on-line measures, Pc.on.iThe total active power is equal to
By adopting the technical scheme, the invention achieves the following technical effects:
the combination optimization of the controllable measures is carried out on the premise of keeping the total quantity of the offline measures basically unchanged, so that the requirement of safe and emergency control of the frequency of the power grid is met; considering the safety and stability quota constraint of the power transmission section, carrying out combined optimization of controllable measures, and ensuring that emergency control adopted for ensuring the frequency safety of the power grid does not lead to the situation that the safety and stability quota of the power transmission section is increased due to the trend distribution change and evolves into a new power grid safety risk; and the combined optimization of controllable measures is carried out by taking the minimum control cost as a target, so that the cost of safe and emergency control of the power grid frequency is reduced. And the online strategy and the offline strategy are selected by checking the timeliness of the online strategy, the consistency of the state of a pressing plate of the control system and the deviation degree of the total amount of the online measures and the total amount of the offline measures after the fault, so that the organic unification of the accuracy and the reliability of the safe and emergency control of the power grid frequency is realized.
Drawings
Fig. 1 is a flow chart of an emergency control online policy generation flow in the method of the present invention.
Fig. 2 is a flow chart of an emergency control strategy selection process after an expected failure occurs in the method of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
Step 1 in fig. 1: setting the current time of the power grid operation as t0Will t0The set formed by all expected faults defended by the self-adaptive emergency control system of the power grid frequency at the moment is recorded as F according to t0Generating a set of controllable measures and controllable quantity and unit active control cost indexes thereof and an emergency control offline value strategy of each expected fault in F according to the running state, pressing plate information, power grid actual measurement information, an offline strategy model and a fixed value of a power grid frequency self-adaptive emergency control system at any moment, calculating the offline measure active total quantity of each expected fault in F respectively, recording the set of controllable measures and controllable quantity and unit active control cost indexes thereof as C, and recording the ith expected fault t in F as T0The total active power of the instant off-line measures is recorded as Pc.iEntering the step 2;
the pressing plate information comprises information such as equipment switching on and off, load level and whether measures are controllable;
step 2 in fig. 1: based on reflection t0The direct current load flow equation of the running state of the power grid at the moment is used for respectively calculating each controllable measure pair t in the C0Active sensitivity of the power transmission section is monitored in each scheduling at each moment, and the step 3 is carried out;
step 3 in fig. 1: respectively combining the controllable measures meeting the constraint condition of the formula (1) in the step C to form a controllable measure group, respectively taking the sum of the controllable quantities of the controllable measures in each controllable measure group and the average value of the unit active control cost index as the controllable quantity and the unit active control cost index of the controllable measure group, and respectively taking the controllable measures in each controllable measure group to t0The average value of the active sensitivity of the same dispatching and monitoring power transmission section at the moment is used as the controllable measure group pair t0The active sensitivity of the power transmission section is monitored by scheduling at any moment, and finally, a set consisting of each controllable measure group, the controllable quantity of each controllable measure group and the active control cost index of each unit is recorded as E, and the step 4 is carried out;
in the formula, K is t0The number of the transmission sections is scheduled and monitored at any moment,
respectively, controllable measures j in C1、j2The unit active power control cost index of (2),
respectively, controllable measures j in C1、j2For t0monitoring the active sensitivity of a power transmission section by the kth scheduling at the moment, α and β are set parameters, alpha is usually set to be 0.1, and β is usually set to be 0.1;
step 4 in fig. 1: aiming at each expected fault in F, solving, scheduling and monitoring constraint conditions that the transmission section active power is not greater than the limit and the control total amount is not less than the active total amount of the offline measures, obtaining the control amount of each controllable measure group in E corresponding to the expected fault by using an equation with the minimum control cost as an optimization target in the controllable amount space of each controllable measure group, decomposing each controllable measure group and the control amount thereof into specific controllable measures and control amounts thereof, using the specific controllable measures and the control amounts thereof as the online measures and the control amounts thereof, and generating an online strategy comprising the expected fault and the emergency controlSlightly corresponding to the power grid operation time t0、t0The information of the emergency control online strategy including the information of the pressing plate, the total active power of the online measures and the corresponding information of the online measures and the control quantity returns to the step 1;
in step 4 of the emergency control online policy generation flow, for each expected failure in F, the following steps are performed:
4-1) solving the optimization function represented by the formula (3) to obtain the control quantity of each controllable measure group in E corresponding to the ith expected fault in F;
in the formula, J3For the number of controllable action groups in E,
is j in E3The unit active control cost index of each controllable measure group,
to the j-th in E corresponding to the i-th expected failure in F3The amount of control of the individual controllable action groups,
is j in E3Controllable quantity of individual controllable measures, Pk.i.0Based on the reflection t0Active power of a k-th dispatching monitoring power transmission section after the ith expected fault in F obtained by calculation of a direct current power flow equation of the power grid operation state at the moment,
is j in E3A controllable measure group pair t0Active sensitivity P of power transmission section is monitored by the kth scheduling at the momentk.i.maxIs t0The limitation of the kth dispatching monitoring power transmission section corresponding to the ith expected fault in the F at the moment is set as a set parameter, and gamma is usually set to be 0.03;
4-2) aiming at each controllable measure group in E, sequentially selecting controllable measures in the corresponding controllable measure combination according to the sequence of the unit active control cost index of the controllable measure from small to large until the sum of the controllable quantities of all the selected controllable measures is more than or equal to the online control quantity of the controllable measures, directly taking the controllable quantity of the selected controllable measure as the control quantity, updating the control quantity of the controllable measure group to the difference value of the sum of the controllable quantity of the selected 1 st to 2 nd controllable measure when the controllable measure which can be continuously controlled in the controllable quantity range is selected finally, and then taking the selected controllable measure and the control quantity thereof as the online measure and the control quantity thereof;
4-3) the power grid operation time t corresponding to the ith expected failure and emergency control online strategy0，t0Time of day clamp information, Pc.on.i[ (in-line measures-1, P)c.on.i.1) (on-line measures-2, P)c.on.i.2)，...，
]As the emergency control online policy information of the ith expected failure, where niThe total number of online measures for the ith expected failure,
j of the ith expected failure4Control quantity of individual on-line measures, Pc.on.iThe total active power is equal to
Step 1 in fig. 2: when an expected fault defended by the power grid frequency self-adaptive emergency control system is detected, the occurrence moment of the expected fault is set as t1According to t1Generating the expected fault t by the running state, the pressing plate information and the power grid actual measurement information of the power grid frequency self-adaptive emergency control system at the moment, the offline strategy model and the fixed value1Emergency control of time is offlineValue strategy, enter step 2;
step 2 in fig. 2: if the detected expected faults belong to the expected faults in the F and the power grid operation time and t corresponding to the emergency control online strategy information of the expected faults1If the time length between the two steps is less than or equal to the set effective time length threshold (usually set to be 2 minutes) of the emergency control online strategy, the step 3 is entered, otherwise, the expected failure t is carried out1Taking the emergency control offline current value strategy as a self-adaptive emergency control strategy, and entering the step 4;
step 3 in fig. 2: calculating the expected failure t1The active total amount of the offline measure in the strategy of emergently controlling the offline current value is recorded as
If t1And (4) if the pressing plate information of the power grid frequency self-adaptive emergency control system at the moment is consistent with the pressing plate information of the power grid operation moment corresponding to the emergency control online strategy information and meets the constraint condition represented by the formula (2), taking all online measures and control quantity thereof in the emergency control online strategy information of the expected fault as a self-adaptive emergency control strategy, and entering the step 4, otherwise, taking the expected fault t as the self-adaptive emergency control strategy1Taking the emergency control offline current value strategy as a self-adaptive emergency control strategy, and entering the step 4;
in the formula, Pc.on.fMu is a set parameter, and is usually set to be 0.05, for the active total amount of the online measures in the expected failure emergency control online strategy information;
step 4 in fig. 2: and (4) implementing emergency control on the power grid according to the self-adaptive emergency control strategy, and returning to the step 1.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (2)
1. A power grid frequency self-adaptive emergency control method considering power transmission section quota is characterized by comprising an emergency control on-line strategy generation process and an emergency control strategy selection process after expected failure occurrence, wherein the emergency control on-line strategy generation process and the emergency control strategy selection process are mutually independent circulation processes,
the emergency control online strategy generation process comprises the following steps:
i-1) setting the current time of the power grid operation as t0Will t0The set formed by all expected faults defended by the self-adaptive emergency control system of the power grid frequency at the moment is recorded as F according to t0Generating a set of controllable measures, controllable quantity of the controllable measures, unit active control cost indexes and an emergency control offline value strategy of each expected fault in the F according to the running state, pressing plate information, power grid actual measurement information, an offline strategy model and a fixed value of a power grid frequency self-adaptive emergency control system at any moment, respectively calculating the active total quantity of each expected fault offline measure in the F, recording the set of the controllable measures, the controllable quantity of the controllable measures and the unit active control cost indexes as C, and recording the ith expected fault t in the F as T0The total active power of the instant off-line measures is recorded as Pc.iEntering the step I-2);
i-2) based on reflection of t0Respectively calculating the controllable measure pairs t in the C according to the direct current load flow equation of the running state of the power grid at the moment0Active sensitivity of each scheduling monitoring power transmission section at each moment, and entering the step I-3);
i-3) respectively combining the controllable measures meeting the constraint condition of the formula (1) in the step C to form a controllable measure group, respectively taking the sum of the controllable quantities of the controllable measures in each controllable measure group and the average value of the unit active control cost indexes as the controllable quantities and the unit active control cost indexes of the controllable measure group, and respectively taking the controllable measures in each controllable measure group to t0The average value of the active sensitivity of the same dispatching and monitoring power transmission section at the moment is used as the controllable measure group pair t0The active sensitivity of the transmission section is monitored by the scheduling at any moment, and finally, the active sensitivity is controlled by each controllable measure groupThe set of the controllable quantity and the unit active control cost index is marked as E, and the step I-4) is carried out;
in the formula, K is t0The number of the transmission sections is scheduled and monitored at any moment,
respectively, controllable measures j in C1、j2The unit active power control cost index of (2),
respectively, controllable measures j in C1、j2For t0active sensitivity of a power transmission section is monitored in the kth scheduling at the moment, and α and β are set parameters;
i-4) aiming at each expected fault in the F, obtaining the control quantity of each controllable measure group in the E corresponding to the expected fault by solving, scheduling and monitoring the constraint conditions that the transmission section has the active power not greater than the limit and the control total quantity is not less than the active total quantity of the offline measures in the controllable quantity space of each controllable measure group by taking the minimum control cost as an optimization target, decomposing each controllable measure group and the control quantity thereof into specific controllable measures and control quantities thereof to serve as online measures and the control quantities thereof, and generating the power grid operation time t corresponding to the online strategy including the expected fault and the emergency control0、t0The emergency control online strategy information including the information of the pressure plate, the active total amount of the online measures and the corresponding information of the online measures and the control amount at the moment is returned to the step I-1);
the emergency control strategy selection process after the occurrence of the expected failure comprises the following steps:
II-1) when the expected fault defended by the power grid frequency self-adaptive emergency control system is detected, setting the occurrence time of the expected fault as t1According to t1Running state, pressing plate information and power grid actual measurement of power grid frequency self-adaptive emergency control system at any momentGenerating the expected failure t by using the information and the off-line strategy model and the fixed value1Entering step II-2) by using the emergency control offline current value strategy at the moment;
II-2) if the detected expected fault belongs to the expected fault in the F and the power grid operation time and t corresponding to the emergency control online strategy information of the expected fault1If the time length between the two steps is less than or equal to the set effective time length threshold of the emergency control online strategy, the step II-3) is carried out, otherwise, the expected fault t is carried out1Taking the emergency control offline current value strategy at the moment as a self-adaptive emergency control strategy, and entering a step II-4);
II-3) calculating the expected failure t1The active total amount of the offline measure in the strategy of emergently controlling the offline current value is recorded as
If t1The pressing plate information of the power grid frequency self-adaptive emergency control system at the moment is consistent with the pressing plate information of the power grid running moment corresponding to the emergency control online strategy information and meets the constraint condition represented by the formula (2), all online measures and control quantity in the emergency control online strategy information of the expected fault are taken as a self-adaptive emergency control strategy, and the step II-4 is carried out, otherwise, the expected fault t is carried out1Taking the emergency control offline current value strategy at the moment as a self-adaptive emergency control strategy, and entering a step II-4);
in the formula, Pc.on.fMu is a set parameter for the active total quantity of the online measures in the online strategy information of the expected failure emergency control;
II-4) implementing emergency control on the power grid according to the adaptive emergency control strategy, and returning to the step II-1).
2. The grid frequency adaptive emergency control method considering the transmission section quota as claimed in claim 1, wherein in step I-4) of the emergency control online strategy generation process, for each expected fault in F, the following steps are respectively performed:
i-4-1) obtaining the control quantity of each controllable measure group in the E corresponding to the ith expected fault in the F by solving an optimization function represented by a formula (3);
in the formula, J3For the number of groups of controllable measures in said E,
is j in the E3The unit active control cost index of each controllable measure group,
is the j-th in E corresponding to the i-th expected failure in F3The amount of control of the individual controllable action groups,
is j in the E3Controllable quantity of individual controllable measures, Pk.i.0Based on the reflection t0Active power of a k-th dispatching monitoring power transmission section after the ith expected fault in the F is calculated by a direct current power flow equation of the power grid operation state at the moment,
is j in the E3A controllable measure group pair t0Active sensitivity P of power transmission section is monitored by the kth scheduling at the momentk.i.maxIs t0The limit of the kth dispatching monitoring power transmission section corresponding to the ith expected fault in the F at the moment, wherein gamma is a set parameter;
i-4-2) aiming at each controllable measure group in the E, respectively and sequentially selecting controllable measures in the corresponding controllable measure combination according to the sequence that the unit active control cost index of the controllable measure is from small to large until the sum of the controllable quantities of all the selected controllable measures is more than or equal to the online control quantity of the controllable measures, directly taking the controllable quantity of the selected controllable measure as the control quantity, updating the control quantity of the controllable measure group to the difference value of the sum of the controllable quantity of the controllable measure group and the controllable quantity of the selected 1 st to 2 nd controllable measure when the controllable measure which can be continuously controlled in the controllable quantity range is selected finally, and then taking the selected controllable measure and the control quantity thereof as the online measure and the control quantity thereof;
i-4-3) is
Emergency control presence policy information as the ith expected failure, where niThe total number of online measures for the ith expected failure,
j of the ith expected failure4Control quantity of individual on-line measures, Pc.on.iThe total active power is equal to
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| CN110350513B (en) * | 2019-05-31 | 2023-05-16 | 国网辽宁省电力有限公司 | Online strategy fixed value checking method for safety and stability control system |
| CN110556828B (en) * | 2019-09-25 | 2022-08-30 | 国电南瑞科技股份有限公司 | Online safety and stability emergency control method and system adaptive to equipment power flow change |
| CN112436542B (en) * | 2020-04-02 | 2023-01-20 | 贵州电网有限责任公司 | Steady-state safety emergency control online pre-decision method considering stability control strategy |
| CN111478338B (en) * | 2020-04-24 | 2021-09-28 | 国电南瑞科技股份有限公司 | New energy low-voltage reactive current coefficient optimization method and system and storage medium |
| CN112186747B (en) * | 2020-09-22 | 2022-07-01 | 国电南瑞南京控制系统有限公司 | Section active control method and device for dealing with functional defects of power grid stability control system |
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| CN106059065A (en) * | 2016-05-15 | 2016-10-26 | 国电南瑞科技股份有限公司 | Safety and stability adaptive emergency control decision method based on in-value control measures |
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