CN115085194B - Power system stability control strategy generation method, system, device and storage medium - Google Patents
Power system stability control strategy generation method, system, device and storage medium Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/0012—Contingency detection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention relates to the technical field of power system stabilization and control, and discloses a method, a system, a device and a storage medium for generating a power system stabilization and control strategy. According to the method, the adjustment factors of all lines are set according to the over-cut simulation data of all lines of the power system; determining a unit to be cut according to the monitored operation fault of the power system; if the corresponding operation fault of the unit to be cut belongs to the preset special fault, replacing the original cutting sequence of the unit to be cut with the corresponding special cutting sequence, and calculating the required cutting amount according to the cutting weight coefficient of the unit which is the most front in the special cutting sequence; if the corresponding operation fault of the unit to be cut does not belong to the preset special fault, calculating the required cutting amount according to the adjustment factor of the corresponding weak line of the unit to be cut; and generating a stable control strategy according to the latest cutter cutting sequence and required cutter cutting amount of the unit of the cutter to be cut. The method avoids adjustment of the setting coefficient, is more flexible in the cutting mode, and improves the flexibility and reliability of emergency stable control of the whole power system.
Description
Technical Field
The invention relates to the technical field of power system stabilization and control, in particular to a method, a system, a device and a storage medium for generating a power system stabilization and control strategy.
Background
The safe and stable control of the power system is an economic and effective means for ensuring the stable operation of the power system. When an electric power system encounters a relatively urgent fault, an emergency control measure is usually executed by a stability control device to ensure the stability of the electric power system.
At present, the common emergency control measures include various measures such as a machine set cutting, load cutting, high-voltage direct-current power modulation and the like. When the unit is cut off, the stable control device generally uses preset setting coefficients (cutting coefficients, transfer coefficients and basic values) and functions to generate the required cutting amount of the unit to be cut off, and the cutting machine is completed according to the determined cutting machine sequence.
For different units to be cut, the required cutting amount is usually calculated by the same set of setting coefficients, and the value of the setting coefficients can be taken according to the maximum requirement to leave a margin in consideration of the universality of the setting coefficients, so that an overlarge cutting amount is caused for part of the units to be cut. According to the prior art, if the required cut under a partial operation mode is to be improved, the cut coefficient, the transfer coefficient and the basic value under the mode need to be re-adjusted, for example, a stability control strategy generation method, a system, a computer device and a storage medium (patent publication No. CN 113315124A) provided in the prior art are provided. The first problem is that the three fixed values need to be re-set for each special operation mode, and the setting workload is greatly increased; secondly, the number of fixed values to be set after setting is finished is large, errors are prone to occur in the actual fixed value executing process, and the fixed values cannot be adjusted quickly after being changed.
In addition, the generator tripping is completed according to the determined generator tripping sequence, which is not suitable for individual fault situations, and the power system is easy to suffer from more serious stability problems due to the generator tripping.
In summary, the existing stable control strategy has the defects that the adjustment efficiency of the setting coefficient is low in the process of setting the cutting amount, and the cutting machine sequence setting is not suitable for individual conditions.
Disclosure of Invention
The invention provides a method, a system, a device and a storage medium for generating a stability control strategy of a power system, which solve the technical problems that the adjustment efficiency of a setting coefficient is low in the process of setting the required cutting amount and the sequence setting of a cutting machine is not suitable for individual conditions in the conventional stability control strategy.
The first aspect of the present invention provides a method for generating a stability control strategy of an electric power system, including:
setting an adjusting factor of each line according to the over-cut simulation data of each line of the power system;
monitoring operation faults and operation data of an electric power system in real time, and determining a unit to be cut of the electric power system according to the operation faults;
if the corresponding operation fault of the unit to be cut belongs to a preset special fault, replacing the original cutting sequence of the unit to be cut with a special cutting sequence of a corresponding fault type, determining a cutting weight coefficient of the unit which is most close to the front special cutting sequence, and calculating the required cutting amount of the unit to be cut according to the cutting weight coefficient and corresponding operation data; if the corresponding operation fault of the unit to be cut does not belong to the preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut;
and generating a stability control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required cutting amount.
According to a manner that can be realized in the first aspect of the present invention, the determining a weight coefficient of a generator tripping machine of a most front unit of a special generator tripping sequence, and calculating a required amount of the generator tripping unit to be tripped according to the weight coefficient of the generator tripping machine and corresponding operation data includes:
obtaining a preset cutter importance coefficient and a preset cutter effect coefficient of the most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
calculating the required cutting amount of the unit to be cut according to a first required cutting amount expression and the weight coefficient of the cutting machine and the corresponding operation data; the first tangent-demand expression is as follows:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
for specially cutting machinesThe weight coefficient of the cutting machine of the front machine set is in the order,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
is the maximum switchable power.
According to a manner that can be realized in the first aspect of the present invention, the calculating a required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut includes:
calculating the required cutting amount of a first round of the unit to be cut according to a second required cutting amount expression; the second cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
the required amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut off the coefficients of the coefficients,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the base value,
in order to achieve the maximum switchable power,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
calculating the second round required cutting amount of the unit to be cut according to the third required cutting expression; the third cut-off demand expression is:
in the formula (I), the compound is shown in the specification,
the second round requires a cut.
According to an implementation manner of the first aspect of the present invention, the generating a stable control strategy of the power system according to the latest generator tripping sequence and the required generator tripping amount of the unit to be generated includes:
judging whether the operation fault belongs to a preset fault of a two-wheel cutter to be required or not for the unit to be cut, which does not belong to the preset special fault and corresponds to the operation fault; if yes, performing a two-round cutting machine according to the first round required cutting amount and the second round required cutting amount; if not, cutting the machine according to the required cutting amount of the first wheel.
According to an implementation manner of the first aspect of the present invention, the generating a stable control strategy of the power system according to the latest generator tripping sequence and the required generator tripping amount of the unit to be generated further includes:
for a machine set to be cut corresponding to the operation fault which does not belong to a preset special fault and does not belong to a preset fault needing two-wheel cutting, obtaining the operation data of the power system after cutting according to the cutting required by a first wheel;
and determining whether the secondary cutting is needed or not according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second wheel when the secondary cutting is needed.
According to a manner that can be realized by the first aspect of the present invention, the setting of the adjustment factor of each line according to the simulation data of the excess cut amount of each line of the power system includes:
for the line with the over-cut amount larger than the preset over-cut amount threshold value, according to
Setting corresponding adjustment factors in the range of (2) so that the larger the over-cut amount is, the smaller the adjustment factor of the corresponding line is;
and setting a corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
A second aspect of the present invention provides a system for generating a stability control strategy of an electric power system, including:
the adjustment factor setting module is used for setting the adjustment factors of all the lines according to the over-cut simulation data of all the lines of the power system;
the system comprises a to-be-cut machine unit determining module, a to-be-cut machine unit determining module and a to-be-cut machine unit determining module, wherein the to-be-cut machine unit determining module is used for monitoring operation faults and operation data of an electric power system in real time and determining the to-be-cut machine unit of the electric power system according to the operation faults;
the system comprises a cutter analysis module, a cutter analysis module and a control module, wherein the cutter analysis module is used for replacing the original cutter sequence of the machine set to be cut with a special cutter sequence of a corresponding fault type when the corresponding operation fault of the machine set to be cut belongs to a preset special fault, determining the cutter weight coefficient of the front-most unit of the special cutter sequence, and calculating the required cutting amount of the machine set to be cut according to the cutter weight coefficient and corresponding operation data; when the corresponding operation fault of the unit to be cut does not belong to a preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut;
and the stability control strategy generating module is used for generating the stability control strategy of the power system according to the latest cutter cutting sequence of the to-be-cut machine set and the required cutting amount.
According to an implementable manner of the second aspect of the invention, the cutter analysis module comprises:
the system comprises a cutter weight coefficient determining unit, a cutter weight coefficient determining unit and a cutter weight coefficient determining unit, wherein the cutter weight coefficient determining unit is used for acquiring a preset cutter importance coefficient and a preset cutter effect coefficient of a most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
the first calculating unit is used for calculating the required cutting amount of the unit to be cut according to the weight coefficient of the cutting machine and the corresponding operation data and a first required cutting expression; the first cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
is specially designed for cuttingThe weight coefficient of the cutting machine of the front machine set is sequenced,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to provide power to the weak line before the fault,
in order to cut off the basis values,
is the maximum switchable power.
According to an implementable manner of the second aspect of the invention, the cutter analysis module comprises:
the second calculation unit is used for calculating the first round required cutting amount of the unit to be cut according to the second required cutting amount expression; the second cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
the amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is closest to the front unit in the sequence of the cutting machine,
in order to cut off the coefficients of the coefficients,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to provide power to the weak line before the fault,
in order to cut off the basis values,
in order to achieve the maximum possible power to be cut,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
the third calculation unit is used for calculating the second round required cutting amount of the unit to be cut according to a third required cutting expression; the third cut-off demand expression is:
in the formula (I), the compound is shown in the specification,
the cut is needed for the second round.
According to an implementable manner of the second aspect of the present invention, the stability control policy generation module includes:
the first stability control strategy generating unit is used for judging whether the operation fault belongs to a preset fault of a two-wheel cutter or not for the unit to be cut corresponding to the operation fault which does not belong to the preset special fault; if yes, performing two-wheel cutting according to the first round of required cutting amount and the second round of required cutting amount; and if not, cutting the machine according to the required cutting amount of the first round.
According to an implementable manner of the second aspect of the present invention, the stability control policy generation module further includes:
the data acquisition unit is used for acquiring the operation data of the power system after the generator unit to be generator is generated according to the required cutting quantity of the first round as the generator unit to be generator corresponding to the operation fault which does not belong to the preset special fault and does not belong to the fault which needs two rounds of generator generators;
and the second stability control strategy generating unit is used for determining whether supplementary cutting is needed according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second round when the supplementary cutting is needed.
According to an implementable manner of the second aspect of the present invention, the adjustment factor setting module includes:
a first adjusting factor setting unit for setting the line with the over-cut amount larger than the preset over-cut amount threshold value according to
Setting corresponding adjustment factors in the range of (2) so that the larger the over-cut amount is, the smaller the adjustment factor of the corresponding line is;
and the second adjusting factor setting unit is used for setting the corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
The third aspect of the present invention provides a power system stability control strategy generating apparatus, including:
a memory to store instructions; the instructions are used for realizing the power system stability control strategy generation method in any one of the realizable modes;
a processor to execute the instructions in the memory.
A fourth aspect of the present invention is a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the method for generating a stability control policy for an electric power system as described in any one of the above-mentioned implementable manners.
According to the technical scheme, the invention has the following advantages:
setting an adjustment factor of each line according to the over-cut simulation data of each line of the power system; determining a unit to be cut according to the monitored operation fault of the power system; if the corresponding operation fault of the unit to be cut belongs to the preset special fault, replacing the original cutting sequence of the unit to be cut with the special cutting sequence of the corresponding fault type, determining the cutting weight coefficient of the unit which is the most front in the special cutting sequence, and calculating the required cutting amount of the unit to be cut according to the cutting weight coefficient and the corresponding operation data; if the corresponding operation fault of the unit to be cut does not belong to the preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut; generating a stability control strategy of the power system according to the latest cutter cutting sequence and required cutting amount of the unit to be cut; according to the method, the adjustment factors related to the over-cutting amount are introduced into the calculation of the required cutting amount, the special cutting machine sequence is additionally arranged for the machine set to be cut corresponding to the special fault, the required cutting amount calculation is carried out according to the weight coefficient of the cutting machine, the adjustment of the setting coefficient is avoided, the cutting machine mode is more flexible, the generated stability control strategy can be applicable to individual special operation modes, and the flexibility and the reliability of the emergency stability control of the whole power system are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a method for generating a stability control strategy of an electrical power system according to an alternative embodiment of the present invention;
fig. 2 is a schematic view of an application scenario of a stability control policy generation method in the prior art according to an optional embodiment of the present invention;
fig. 3 is a schematic block diagram of a power system stability control policy generation system according to an alternative embodiment of the present invention.
Reference numerals:
1-adjustment factor setting module; 2-a determination module of the machine set to be cut; 3-a cutter analysis module; and 4, a stability control strategy generation module.
Detailed Description
The embodiment of the invention provides a method, a system, a device and a storage medium for generating a stability control strategy of a power system, which are used for solving the technical problems that the existing stability control strategy has the defects that the adjustment efficiency of a setting coefficient is low in the process of setting the required cutting amount and the sequence setting of a cutting machine is not suitable for individual conditions.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for generating a stability control strategy of a power system.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for generating a stability control policy of an electrical power system according to an embodiment of the present invention.
The method for generating the stability control strategy of the power system provided by the embodiment of the invention comprises the following steps:
step S1, setting an adjusting factor of each line according to the over-cut simulation data of each line of the power system.
In the prior art, for different units to be cut, the required cutting amount is usually calculated by using the same set of setting coefficients, and the value of the setting coefficients can be taken according to the maximum requirement to leave a margin in consideration of the universality of the setting coefficients, so that an overlarge cutting amount is caused for part of the units to be cut.
The problem of the excessive cutting amount will be specifically described below by taking a specific example as an example.
Referring to fig. 2, fig. 2 is a schematic view illustrating an application scenario of a stability control policy generation method in the prior art according to an alternative embodiment of the present invention.
And scanning the fault of the whole network, and determining that the strategy protection fault is a Nanning-Yulin (Nanyu) double-line trip. In each operating mode, when a south jade double-line trip fault occurs, the stable condition of the power system is as shown in table 1.
Table 1:
as can be seen from table 1, in various operation modes, after a nanyu double-line trip fault occurs, the system generally has the problem of seaport-julong (kailu) line overload, and units in peripheral junzhou and urban defense areas need to be removed.
The control strategies implemented in the prior art are:
(1) The required cut was calculated using the following formula:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
to the coefficient of ablation，
In order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the base value,
is the maximum switchable power.
(2) Coefficient of transfer
The method of determination is as follows: in the jade/jade repair mode, after double south jade lines are tripped out, the sea-time line tide increment is about 50% of the original power of the double south jade lines; in other modes except the long-term overhaul, after the south jade double-line is tripped, the sea-term power flow increment of the south jade double-line is about 40 percent of the original power of the south jade double-line; a certain margin is reserved, and the device is arranged in the mode of repairing when the jade is met or when the jade is met
Coefficient of 0.6, and in other ways, set
The coefficient was 0.45;
(3) Adjusting the starting mode of the unit, cutting off the urban defense unit according to different operation modes, knowing according to the variation of the sea permanent line tide, when the system is fully connected and the urban defense unit is most powerful, the generator cutter has the least influence on the sea permanent line tide, and the corresponding machine cutter at the moment has the least influence on the sea permanent line tide
Maximum valueLarge, considering a certain margin, set
Is 4.5;
(4) Since the marine timeline capacity is about 2630MW, a base value is set in consideration of a certain margin
Is 2500MW.
After control is performed according to the control strategy implemented in the prior art, the over-cut amount situation under each mode can be obtained as shown in table 2.
Table 2:
in each mode, except for the flat permanent single line maintenance, the over-cutting amount is more than 200MW (the required cutting amount is not 0), and the requirement of safety margin is met. For the maintenance of the plain permanent single line, the over-cut amount under the initial coefficient is small, and the safety margin is insufficient, the maintenance of the plain permanent single line is to be carried out
After the cut is increased to 0.5, the over-cut amount can meet the requirement. The inside and outside of the parentheses are the adjusted value and the pre-adjusted value, respectively.
As can be seen from table 2, the average over-cut in each case is already ideal, but still problematic. For example, although the average overcut is small, there are 3 modes of operation with overcut in excess of 1000MW, including one in excess of 2000MW. The reason for this is that the versatility of the setting of the coefficients needs to be considered, i.e. the same set of coefficients needs to cover all cases. In order to meet the requirement, the values of all the coefficients need to be taken according to the maximum requirement to leave a margin, but in an actual mode, the coefficient with such a large value is not necessarily required for a specific mode, and the difference causes a great excessive cut in a partial mode. According to the prior art, if the cut-off quantity in a partial operation mode is to be improved, the mode needs to be re-adjusted
，
And
. The two problems are caused, firstly, three fixed values are required to be set again for each special operation mode, and the setting workload is greatly improved; secondly, the number of fixed values to be set after setting is finished is large, errors are prone to occur in the actual fixed value executing process, and the fixed values cannot be adjusted quickly after being changed.
In order to solve the problems in the prior art, the embodiment provides a concept of the adjustment factor, and calculates the demand of the subsequent to-be-cut machine set based on the adjustment factor.
In one possible implementation, setting the adjustment factor for each of the lines comprises:
for the line with the over-cut amount larger than the preset over-cut amount threshold value, according to
Setting corresponding adjustment factors in the range of (1) to enable the adjustment factors of the corresponding lines to be smaller when the over-cut amount is larger;
and setting a corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
Specifically, for the application scenario in fig. 2, it may be set that when the over-cut amount of each line in table 2 exceeds 400MW, a specific value of the adjustment factor corresponding to each line is set with 1 as a starting point and 0.1 as a step.
As an example, the adjustment factor corresponding to each line may be set as shown in table 3.
Table 3:
and S2, monitoring the operation faults and the operation data of the power system in real time, and determining a unit to be cut of the power system according to the operation faults.
The operation fault is obtained by scanning the operation state of the power system in real time, and the operation data is related operation parameters which are acquired in real time in the operation process of the power system or acquired by processing the acquired data and are used for stably controlling the power system. The operation faults can include a trip fault, a direct current fault, a main transformer fault and the like, that is, the stability control strategy generation method of the embodiment is also suitable for the stability control of the direct current fault and the main transformer fault of the power system, and only the operation faults needing to be monitored by the stability control device are different.
After the operation fault is obtained, it is further determined whether the fault may cause a instability problem of the entire power system, such as line overload, voltage instability, frequency instability, and the like, and only the operation fault that may cause the instability of the power system needs to be handled urgently, that is, a corresponding stability control strategy needs to be adopted to ensure that the power system after the fault still can operate continuously and effectively.
The existing mode can be adopted to determine the to-be-cut machine set of the power system according to the operation fault. For example, the operation faults can be simulated, the fault type causing the instability problem is determined according to the simulation result, the to-be-cut machine set corresponding to each fault type is determined, and a corresponding to-be-cut machine set list corresponding to the fault type is formed, so that when the operation faults are monitored, the to-be-cut machine set can be determined in a mode of inquiring the to-be-cut machine set list. The embodiment of the present invention is not limited thereto.
S3, if the corresponding operation fault of the unit to be cut belongs to a preset special fault, replacing the original cutting sequence of the unit to be cut with a special cutting sequence of a corresponding fault type, determining a cutting weight coefficient of the most front unit of the special cutting sequence, and calculating the required cutting amount of the unit to be cut according to the cutting weight coefficient and corresponding operation data; and if the corresponding operation fault of the unit to be cut does not belong to the preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut.
In an implementation manner, the calculating, according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut, a required cutting amount of the unit to be cut includes:
calculating the first round required cutting amount of the unit to be cut according to the second required cutting expression; the second cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
the amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is closest to the front unit in the sequence of the cutting machine,
in order to cut off the coefficients of the coefficients,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
in order to achieve the maximum switchable power,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
calculating the second round required cutting amount of the unit to be cut according to the third required cutting expression; the third cut-off demand expression is:
in the formula (I), the compound is shown in the specification,
the cut is needed for the second round.
Compared with the prior art, the method and the device have the advantages that the cutting mode is changed into the splitting and wheel cutting mode, and the expressions of the first round required cutting amount and the second round required cutting amount are set according to the adjusting factor.
In order to verify the effect of the required cutting amount setting mode in the embodiment of the present invention, the application scenario in fig. 2 is taken as an example, and based on the adjustment factor in table 3, the required cutting amount of the unit to be cut is determined by using the expression of the required cutting amount in the first round in the embodiment. The operating modes after the stability control strategy in this embodiment is implemented are simulated, and the over-cut amount conditions in each mode can be obtained as shown in table 4.
Table 4:
it can be seen from table 4 that the adjusted average overcut decreased from "424" to "265" by about 38%. It can be seen that the average cut after adjustment is significantly reduced compared to the prior art.
In practice, there is a problem that the selection of the similar cutting unit is not appropriate, except for the case where the amount of the over-cut is excessively large. In a stability control strategy in the prior art, a cutter cutting sequence is determined in advance and can not be changed, flexibility is lacked, and the condition that the cutter cutting sequence needs to be changed cannot be covered. The generator tripping is completed according to the determined generator tripping sequence, which is not suitable for individual fault situations, and the power system is easy to suffer from more serious stability problems due to the generator tripping.
This is illustrated below by way of an example. For the application scenario shown in fig. 2, nuclear power is not as flexible as conventional energy adjustment such as thermal power, and the capacity of a nuclear power single machine is large, if the nuclear power single machine is cut off, the system impact is larger, so the original generator tripping sequence is set to cut off the urban defense port unit first, and then to cut off the light slope nuclear power unit. However, after 4 nuclear power units are added to the light slope nuclear power unit, overload problems exist when single-line maintenance is carried out on light sea (light slope-harbor) and double-line tripping is carried out on light south (light slope-nanning).
According to the prior art, if the urban defense unit is cut off first after a fault occurs and then the light slope unit is cut off subsequently, the cut-off amount is required to exceed the total output of the urban defense power plant in the fixed value setting, so that the light slope nuclear power unit can be cut off. For urban defense power plants capable of emitting 2400MW in total, the set fixed value is required to generate the cutting amount of 2400MW or more under the condition of maximum output so as to cut the light slope nuclear power. In fact, the overload problem is caused by the fact that the residual single-return light sea line after the fault cannot convey the output of all the bare-slope nuclear power units, so that the removal of the unit of the urban defense power plant does not help to solve the overload problem (as can be seen in fig. 2, the urban defense power plant is below and is not related to the output power of the bare-slope nuclear power units), but the removal of the unit of the urban defense power plant may cause the loss of the power supply, and the system may suffer from a more serious stability problem. Besides, the similar phenomenon also exists in the optical south line maintenance optical sea double line tripping.
In order to solve the above-mentioned deficiencies, in this embodiment, by classifying the situation as a special fault type, when it is detected that the two special maintenance states exist and a corresponding fault occurs, a special tripping sequence is executed to avoid a more serious stability problem of the system.
In an implementation manner, the determining a tripping weight coefficient of a most front unit of a special tripping sequence, and calculating a required tripping amount of the unit to be tripped according to the tripping weight coefficient and corresponding operation data includes:
obtaining a preset cutter importance coefficient and a preset cutter effect coefficient of the most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
calculating the required cutting amount of the unit to be cut according to a first required cutting expression according to the weight coefficient of the cutting machine and the corresponding operation data; the first cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
is the maximum switchable power.
And sequencing the generator tripping sequence of each unit based on the generator tripping weight coefficient. For the application scenario in fig. 2, the importance of the generator tripping and the effect coefficient of the generator tripping of the bare slope nuclear power unit can be set to be larger than the corresponding coefficients of the urban defense unit. Therefore, in the cutting sequence, the bare slope nuclear power unit can be used as a first cutting object. In the process of setting the fixed value, setting is carried out on the basis of the fixed value, and unnecessary cutting machines are avoided.
Because the value of the weight coefficient of the generator tripping is the product of the preset generator tripping importance coefficient and the preset generator tripping effect coefficient, the expression of the weight coefficient of the generator tripping can be set as follows:
in the formula (I), the compound is shown in the specification,
indicating machine set
In that
The weight coefficient of the cutting machine in the state,
as a unit
In that
The effect coefficient of the cutting machine in the state,
as a unit
The cutter importance coefficient of, wherein
，
If =1, it means that the state is normal,
the time of =2 indicates the first maintenance state,
and if =3, it means that the maintenance is in the second maintenance state.
The values of the cutter importance coefficient and the cutter effect coefficient can be set according to actual conditions. For example, for the application scenario shown in fig. 2, the generator tripping importance coefficient of the urban harbor defense power plant unit may be set to be greater than the generator tripping importance coefficient of the light slope unit. For the unit of preventing the power plant from the urban harbor, the method can be set
Namely, the generator tripping effect coefficients of the urban harbor power plant unit under the three states are the same. For a light slope unit, can be arranged
，
And is and
and the generator tripping effect coefficient of the smooth slope unit in the overhauling state is larger than the generator tripping effect coefficient in the normal state.
The value of the effect coefficient of the generator tripping machine when the generator set is in the normal state can be set to be smaller than the value of the generator set in the maintenance state, namely, the effect coefficient of the generator tripping machine is set
And is and
. In which can be arranged
。
The value of the important coefficient of the cutting machine can be set according to the importance of the unit in the whole system. For example, for the application scenario shown in fig. 2, the generator tripping importance coefficient of the urban harbor defense power plant unit may be set to be greater than the generator tripping importance coefficient of the light slope unit.
And S4, generating a stable control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required cutting amount.
In an implementation manner, the generating a stable control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required generator tripping amount includes:
judging whether the operation fault belongs to a preset fault of a two-wheel cutter to be required or not for the unit to be cut, which does not belong to the preset special fault and corresponds to the operation fault; if yes, performing a two-round cutting machine according to the first round required cutting amount and the second round required cutting amount; if not, cutting the machine according to the required cutting amount of the first wheel.
As an implementation mode, the preset two-wheel cutter failure is a three-phase failure. Therefore, when a three-phase fault occurs, the two-wheel cutter is in full motion, when no fault occurs, the two-wheel cutter is not in motion, and when other types of faults occur, only one-wheel cutter is performed.
In an implementation manner, the generating a stable control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required generator tripping amount further includes:
for a machine set to be cut corresponding to the operation fault which does not belong to a preset special fault and does not belong to a preset fault needing two-wheel cutting machine, obtaining operation data of the power system after cutting according to the cutting quantity needed by the first wheel;
and determining whether the secondary cutting is needed or not according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second wheel when the secondary cutting is needed.
The method includes the steps of obtaining operation data, determining whether to perform additional cutting according to the obtained operation data, and determining whether to perform additional cutting according to the voltage recovery condition. Specifically, when the voltage is recovered, the supplementary cutting is not performed, and when the voltage is not recovered, the cutting machine is performed according to the required cutting amount of the second round.
In consideration of the severity of the recovery stabilization time required by the conventional stabilization guide, the time constant values of two cutting machines can be set to be the same, and the voltage constant values can be set according to the past experience. For the scene with loose requirements on the voltage recovery time, the two-wheel cutting machine can be set to have the same voltage fixed value and different time fixed values so as to carry out complementary cutting under the condition of insufficient cutting and recover the system voltage.
Compared with the prior art, the generator tripping sequence and the corresponding generator tripping amount are variable, so that the adaptability of the power grid state change needing to adjust the generator tripping sequence is enhanced.
The invention also provides a system for generating the stability control strategy of the power system.
Referring to fig. 3, fig. 3 is a schematic block diagram illustrating a stability control strategy generation system of an electric power system according to an embodiment of the present invention.
The embodiment of the invention provides a system for generating a stability control strategy of a power system, which comprises:
the adjusting factor setting module 1 is used for setting the adjusting factor of each line according to the over-cut simulation data of each line of the power system;
the system comprises a to-be-cut machine set determining module 2, a to-be-cut machine set determining module and a to-be-cut machine set determining module, wherein the to-be-cut machine set determining module is used for monitoring the operation fault and the operation data of the power system in real time and determining the to-be-cut machine set of the power system according to the operation fault;
the generator tripping analysis module 3 is used for replacing the original generator tripping sequence of the generator set to be switched with a special generator tripping sequence of a corresponding fault type when the corresponding operation fault of the generator set to be switched belongs to a preset special fault, determining a generator tripping weight coefficient of the most front generator set of the special generator tripping sequence, and calculating the required generator tripping amount of the generator set to be switched according to the generator tripping weight coefficient and corresponding operation data; when the corresponding operation fault of the unit to be cut does not belong to a preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut;
and the stability control strategy generating module 4 is used for generating the stability control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required cutting amount.
In one implementation, the cutting machine analysis module 3 includes:
the cutter weight coefficient determining unit is used for acquiring a preset cutter importance coefficient and a preset cutter effect coefficient of the most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
the first calculation unit is used for calculating the required cutting amount of the unit to be cut according to a first required cutting amount expression according to the weight coefficient of the cutting machine and the corresponding operation data; the first cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is closest to the front unit in the sequence of the cutting machine,
in order to cut off the coefficients of the coefficients,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
is the maximum switchable power.
In one implementation, the cutting machine analysis module 3 includes:
the second calculation unit is used for calculating the first round required cutting amount of the unit to be cut according to the second required cutting amount expression; the second cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
the amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut the coefficient of the slice,
for tidal currentThe coefficient of the shift is changed,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
in order to achieve the maximum switchable power,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
the third calculation unit is used for calculating the second round cutting quantity of the unit to be cut according to a third cutting quantity demand expression; the third cut-off demand expression is:
in the formula (I), the compound is shown in the specification,
the cut is needed for the second round.
In an implementation manner, the stability control strategy generating module 4 includes:
the first stability control strategy generating unit is used for judging whether the operation fault belongs to a preset fault of a two-wheel cutter or not for the unit to be cut corresponding to the operation fault which does not belong to the preset special fault; if yes, performing two-wheel cutting according to the first round of required cutting amount and the second round of required cutting amount; if not, cutting the machine according to the required cutting amount of the first wheel.
In an implementation manner, the stability control strategy generating module 4 further includes:
the data acquisition unit is used for acquiring the operation data of the power system after the machine cutting is carried out according to the cutting quantity required by the first round for the machine set to be cut corresponding to the operation fault which does not belong to the preset special fault and does not belong to the preset fault requiring two-wheel machine cutting;
and the second stability control strategy generating unit is used for determining whether supplementary cutting is needed according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second round when the supplementary cutting is needed.
In one implementation, the adjustment factor setting module 1 includes:
a first adjusting factor setting unit for setting the line with the over-cut amount larger than the preset over-cut amount threshold value according to
Setting corresponding adjustment factors in the range of (1) to enable the adjustment factors of the corresponding lines to be smaller when the over-cut amount is larger;
and the second adjusting factor setting unit is used for setting the corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
The invention also provides a power system stability control strategy generation device, which comprises:
a memory to store instructions; the instructions are used for realizing the power system stability control strategy generation method according to any one of the above embodiments;
a processor to execute the instructions in the memory.
The present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for generating a stability control policy of an electric power system according to any one of the above embodiments is implemented.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, apparatuses and modules described above may refer to the corresponding processes in the foregoing method embodiments, and the specific beneficial effects of the systems, apparatuses and modules described above may refer to the corresponding beneficial effects in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one position, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for generating a stability control strategy of an electric power system is characterized by comprising the following steps:
setting an adjusting factor of each line according to the over-cut simulation data of each line of the power system;
monitoring operation faults and operation data of an electric power system in real time, and determining a unit to be cut of the electric power system according to the operation faults;
if the corresponding operation fault of the unit to be cut belongs to a preset special fault, replacing the original cutting sequence of the unit to be cut with a special cutting sequence of a corresponding fault type, determining a cutting weight coefficient of the unit which is most close to the front special cutting sequence, and calculating the required cutting amount of the unit to be cut according to the cutting weight coefficient and corresponding operation data; if the corresponding operation fault of the unit to be cut does not belong to the preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut;
generating a stability control strategy of the power system according to the latest generator tripping sequence of the generator set to be generator tripped and the required cutting amount;
the method for determining the weight coefficient of the generator tripping machine of the most front unit of the special generator tripping sequence and calculating the required cutting amount of the generator set to be tripped according to the weight coefficient of the generator tripping machine and the corresponding operation data comprises the following steps:
acquiring a preset cutter importance coefficient and a preset cutter effect coefficient of a most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
calculating the required cutting amount of the unit to be cut according to a first required cutting expression according to the weight coefficient of the cutting machine and the corresponding operation data; the first cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
in order to obtain the final amount of the cutting machine,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the basis values,
maximum switchable power;
the calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut comprises the following steps:
calculating the first round required cutting amount of the unit to be cut according to the second required cutting expression; the second cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
the amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to be able to power the weak line before failure,
in order to cut off the base value,
in order to achieve the maximum switchable power,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
calculating the second round required cutting amount of the unit to be cut according to the third required cutting expression; the third cut-off requirement expression is as follows:
in the formula (I), the compound is shown in the specification,
the cut is needed for the second round.
2. The method for generating the stability control strategy of the electric power system according to claim 1, wherein the generating the stability control strategy of the electric power system according to the latest generator tripping sequence of the generator tripping set to be triggered and the required generator tripping amount comprises:
judging whether the operation fault belongs to a preset fault of a two-wheel cutter to be required or not for the unit to be cut, which does not belong to the preset special fault and corresponds to the operation fault; if yes, performing a two-round cutting machine according to the first round required cutting amount and the second round required cutting amount; if not, cutting the machine according to the required cutting amount of the first wheel.
3. The method for generating the stability control strategy of the electric power system according to claim 2, wherein the generating the stability control strategy of the electric power system according to the latest generator tripping sequence of the generator unit to be generated and the required generator tripping amount further comprises:
for a machine set to be cut corresponding to the operation fault which does not belong to a preset special fault and does not belong to a preset fault needing two-wheel cutting machine, obtaining operation data of the power system after cutting according to the cutting quantity needed by the first wheel;
and determining whether the secondary cutting is needed or not according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second round when the secondary cutting is needed.
4. The method for generating the stability control strategy of the power system according to claim 1, wherein the setting of the adjustment factor of each line according to the simulation data of the over-cut amount of each line of the power system comprises:
for the line with the over-cut amount larger than the preset over-cut amount threshold value, according to
Setting corresponding adjustment factors in the range of (1) to enable the adjustment factors of the corresponding lines to be smaller when the over-cut amount is larger;
and setting a corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
5. A power system stability control strategy generation system is characterized by comprising:
the adjustment factor setting module is used for setting the adjustment factors of all the lines according to the over-cut simulation data of all the lines of the power system;
the system comprises a to-be-cut machine unit determining module, a to-be-cut machine unit determining module and a to-be-cut machine unit determining module, wherein the to-be-cut machine unit determining module is used for monitoring operation faults and operation data of an electric power system in real time and determining the to-be-cut machine unit of the electric power system according to the operation faults;
the system comprises a cutter analysis module, a cutter analysis module and a control module, wherein the cutter analysis module is used for replacing the original cutter sequence of the machine set to be cut with a special cutter sequence of a corresponding fault type when the corresponding operation fault of the machine set to be cut belongs to a preset special fault, determining the cutter weight coefficient of the front-most unit of the special cutter sequence, and calculating the required cutting amount of the machine set to be cut according to the cutter weight coefficient and corresponding operation data; when the corresponding operation fault of the unit to be cut does not belong to a preset special fault, calculating the required cutting amount of the unit to be cut according to the adjustment factor and the corresponding operation data of the corresponding weak line of the unit to be cut;
the stable control strategy generating module is used for generating a stable control strategy of the power system according to the latest cutter cutting sequence of the unit to be cut and the required cutting amount;
the cutter analysis module comprises:
the cutter weight coefficient determining unit is used for acquiring a preset cutter importance coefficient and a preset cutter effect coefficient of the most front unit of the special cutter sequence, and taking the product of the preset cutter importance coefficient and the preset cutter effect coefficient as a corresponding cutter weight coefficient;
the first calculating unit is used for calculating the required cutting amount of the unit to be cut according to the weight coefficient of the cutting machine and the corresponding operation data and a first required cutting expression; the first cut-to-demand expression is:
in the formula (I), the compound is shown in the specification,
in order to obtain the final cutting amount,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut off the coefficients of the coefficients,
for transferring the currentThe coefficients of which are such that,
for the power of the line to be protected before the fault,
in order to provide power to the weak line before the fault,
in order to cut off the base value,
maximum switchable power;
the cutter analysis module comprises:
the second calculation unit is used for calculating the first round required cutting amount of the unit to be cut according to the second required cutting amount expression; the second cut-off demand expression is as follows:
in the formula (I), the compound is shown in the specification,
the amount of cutting is needed for the first round,
in order to calculate the amount of the computer cutting,
in order to determine the weight coefficient of the cutting machine which is the most front unit in the cutting machine sequence,
in order to cut the coefficient of the slice,
in order to obtain the power flow transfer coefficient,
for the power of the line to be protected before the fault,
in order to provide power to the weak line before the fault,
in order to cut off the basis values,
in order to achieve the maximum possible power to be cut,
the adjustment factor is the adjustment factor of the unit of the machine to be cut;
the third calculation unit is used for calculating the second round required cutting amount of the unit to be cut according to a third required cutting expression; the third cut-off demand expression is:
in the formula (I), the compound is shown in the specification,
the second round requires a cut.
6. The power system stability control strategy generation system according to claim 5, wherein the stability control strategy generation module comprises:
the first stability control strategy generating unit is used for judging whether the operation fault belongs to a preset fault of a two-wheel cutting machine or not for the unit to be cut corresponding to the operation fault which does not belong to the preset special fault; if yes, performing a two-round cutting machine according to the first round required cutting amount and the second round required cutting amount; if not, cutting the machine according to the required cutting amount of the first wheel.
7. The power system stability control strategy generating system according to claim 6, wherein the stability control strategy generating module further comprises:
the data acquisition unit is used for acquiring the operation data of the power system after the machine cutting is carried out according to the cutting quantity required by the first round for the machine set to be cut corresponding to the operation fault which does not belong to the preset special fault and does not belong to the preset fault requiring two-wheel machine cutting;
and the second stability control strategy generating unit is used for determining whether supplementary cutting is needed according to the acquired operation data, and cutting the machine according to the cutting amount needed by the second round when the supplementary cutting is needed.
8. The system according to claim 5, wherein the adjustment factor setting module includes:
a first adjustment factor setting unit for setting the line with over-cut larger than the preset over-cut threshold value according to
Setting corresponding adjustment factors in the range of (2) so that the larger the over-cut amount is, the smaller the adjustment factor of the corresponding line is;
and the second adjusting factor setting unit is used for setting the corresponding adjusting factor to be 1 for the line with the over-cut amount not greater than the preset over-cut amount threshold value.
9. An electric power system stability control strategy generation device is characterized by comprising:
a memory to store instructions; the instructions are used for realizing the power system stability control strategy generation method according to any one of claims 1-4;
a processor to execute the instructions in the memory.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the power system stability control policy generation method according to any one of claims 1 to 4.
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