CN114069665B - Optimization method, device and system for energy storage to participate in low-frequency safety and stability control of power grid and storage medium - Google Patents
Optimization method, device and system for energy storage to participate in low-frequency safety and stability control of power grid 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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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Abstract
The invention discloses an optimization method, a device, a system and a storage medium for energy storage to participate in low-frequency safety and stability control of a power grid, wherein the method comprises the following steps: acquiring the remaining duration and the current state of energy storage of each energy storage substation in the power grid, wherein the remaining duration and the current state of energy storage are discharged with maximum power, and classifying the energy storage based on the remaining duration and the current state of energy storage; acquiring energy storage power, charging power and discharging power of pre-shortage energy storage of each energy storage substation in a power grid, and calculating the modulation quantity of each type of energy storage based on the energy storage power, the charging power and the discharging power; when modulating energy storage, sequentially calling each type of energy storage according to a preset priority; acquiring the total modulation amount required by the current class energy storage of each energy storage substation in the power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation; the invention can meet the requirements of safe and stable operation of the diversified and lean power grid.
Description
Technical Field
The invention relates to an optimization method, device and system for energy storage to participate in low-frequency safety and stability control of a power grid and a storage medium, and belongs to the technical field of power systems.
Background
The energy storage matched with the new energy unit becomes an important technology for large-scale access of new energy and extra-high voltage direct current construction. Aiming at the increasingly prominent problem of safety and stability of the frequency of the power grid, the quick response characteristic and the power bidirectional regulation capability of electrochemical energy storage are utilized to be incorporated into the control system for safety and stability, and the control system is taken as an important control resource to cope with the problem of low frequency caused by high power shortage.
When the power grid is in high-power shortage, the frequency of the power grid is greatly reduced. Aiming at the situation of direct current blocking, tripping of a large power plant unit and other power shortage, an emergency control method can be adopted to avoid the loss of a large amount of load due to the fact that the frequency of the power grid falls down to trigger a third defensive line action. Energy storage control can be added on the basis of the traditional direct current modulation, pump cutting and load cutting control means, and on the basis of enriching power grid control resources, the control quantity of load cutting resources in high-power shortage is reduced, and economic loss is reduced.
But the energy storage is in different states in the power grid, the supporting capacity of the power grid is greatly different, and even the frequency drop of the power grid is accelerated. When a high-power shortage fault of the power grid occurs, one type of energy storage consumes electric quantity in a short time, the power shortage of the power grid is further increased, and the energy storage needs to be brought into a control range when safety and stability control is considered. Meanwhile, the residual energy of the stored energy is insufficient to support the power grid, and the power grid can be exhausted in a short time when forcibly adjusted, so that the system is under-controlled, and the safety problem is caused.
Therefore, when the energy storage is called to solve the problem of low-frequency stability of the power grid, the current output power of the energy storage cannot be improved, different control means are needed for the energy storage under different states, and the method for participating in frequency safety and stability control of the energy storage is needed to be further optimized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an optimization method, device, system and storage medium for energy storage to participate in low-frequency safety and stability control of a power grid.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
In a first aspect, the invention provides an optimization method for energy storage to participate in low-frequency safety and stability control of a power grid, which comprises the following steps:
Acquiring the remaining duration and the current state of energy storage of each energy storage substation in the power grid, wherein the remaining duration and the current state of energy storage are discharged with maximum power, and classifying the energy storage based on the remaining duration and the current state of energy storage;
Acquiring energy storage power, charging power and discharging power of pre-shortage energy storage of each energy storage substation in a power grid, and calculating the modulation quantity of each type of energy storage based on the energy storage power, the charging power and the discharging power;
when modulating energy storage, sequentially calling each type of energy storage according to a preset priority;
the method comprises the steps of obtaining the total modulation amount required by the current class energy storage of each energy storage substation in a power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation.
Optionally, classifying the stored energy based on the remaining duration and the current state of the stored energy includes:
energy storage of the first type: the remaining duration is more than or equal to a preset time fixed value Tmin;
The second type of energy storage: the remaining duration is less than a preset time fixed value Tmin, and the current state of energy storage is a charging state;
third type of energy storage:
The remaining duration is less than a preset time fixed value Tmin, and the energy storage current state is a standby state; or (b)
The residual duration is less than a preset time fixed value Tmin, the current energy storage state is a discharge state, and the discharge time maintained by the discharge state is more than or equal to a preset time fixed value Tsy;
Fourth type of energy storage:
The remaining duration is less than a preset time constant value Tmin, and the current state of the energy storage is a discharge state, and the discharge time maintained by the discharge state is less than a preset time constant value Tsy.
Optionally, calculating the modulation amount of each type of energy storage based on the energy storage power, the charging power and the discharging power includes:
the modulation amount of the first type of energy storage is as follows:
Pes1＝Pmax×K+P′es1
Wherein P max is the maximum discharge power of the energy storage, K is the discharge power conversion coefficient, and P' es1 is the energy storage power of the energy storage before the occurrence of power shortage;
the modulation quantity of the second type of energy storage is as follows:
Pes2＝Pcd2
Wherein P cd2 is the charging power of the stored energy before the occurrence of power shortage;
The third type of energy storage has no modulation quantity;
the modulation quantity of the fourth type of energy storage is as follows:
Pes4＝Pcd4
wherein, P cd4 is the discharge power of the energy storage before the occurrence of power shortage.
Optionally, the modulation amount required by the current energy storage of each energy storage substation is as follows:
Wherein D in is the modulation quantity required by the nth class energy storage of the ith energy storage sub-station, P in is the modulation quantity required by the nth class energy storage of the ith energy storage sub-station, D n is the sum of the modulation quantity required by the nth class energy storage of all the energy storage sub-stations, m is the number of the energy storage sub-stations in the power grid, and n is the number of the current class.
In a second aspect, the present invention provides an optimizing device for energy storage to participate in low-frequency safety and stability control of a power grid, the device comprising:
the energy storage classification module is used for acquiring the remaining duration and the current state of the energy storage of each energy storage substation in the power grid discharged with the maximum power, and classifying the energy storage based on the remaining duration and the current state of the energy storage;
the modulation amount calculating module is used for obtaining the energy storage power, the charging power and the discharging power of the pre-shortage energy storage of each energy storage substation in the power grid and calculating the modulation amount of each type of energy storage based on the energy storage power, the charging power and the discharging power;
The calling module is used for calling each type of energy storage in turn according to a preset priority when modulating the energy storage;
The command issuing module is used for acquiring the total modulation amount required by the current class energy storage of each energy storage substation in the power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation.
In a third aspect, the invention provides an optimization system for energy storage to participate in low-frequency safety and stability control of a power grid, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
the processor is operative according to the instructions to perform the steps of the method according to any one of the preceding claims.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor performs the steps of any of the methods described above.
Compared with the prior art, the invention has the beneficial effects that:
According to the optimization method, the device, the system and the storage medium for the energy storage to participate in the low-frequency safety and stability control of the power grid, the energy storage is classified and prioritized, the modulation quantity is calculated for each type of energy storage, and the modulation quantity required by each type of energy storage of each energy storage substation is obtained based on the prioritization and the modulation quantity of each type of energy storage during final energy storage modulation, so that the operation risk brought by controlling the energy storage is solved.
Drawings
Fig. 1 is a flowchart of an optimization method for energy storage to participate in low-frequency safety and stability control of a power grid provided by an embodiment of the invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Embodiment one:
as shown in fig. 1, the embodiment of the invention provides an optimization method for energy storage to participate in low-frequency safety and stability control of a power grid, which comprises the following steps:
(1) Acquiring the remaining duration and the current state of energy storage of each energy storage substation in the power grid, wherein the remaining duration and the current state of energy storage are discharged with maximum power, and classifying the energy storage based on the remaining duration and the current state of energy storage; the specific classification is as follows:
classifying the stored energy based on the remaining duration and the current state of the stored energy includes:
energy storage of the first type: the remaining duration is more than or equal to a preset time fixed value Tmin;
The second type of energy storage: the remaining duration is less than a preset time fixed value Tmin, and the current state of energy storage is a charging state;
third type of energy storage:
The remaining duration is less than a preset time fixed value Tmin, and the energy storage current state is a standby state; or (b)
The residual duration is less than a preset time fixed value Tmin, the current energy storage state is a discharge state, and the discharge time maintained by the discharge state is more than or equal to a preset time fixed value Tsy;
Fourth type of energy storage:
The remaining duration is less than a preset time constant value Tmin, and the current state of the energy storage is a discharge state, and the discharge time maintained by the discharge state is less than a preset time constant value Tsy.
The preset time fixed value Tmin is obtained by setting the maximum power discharge time fixed value Tmin of energy storage according to power grid dispatching operation experience, corresponding to power grid accident handling time and keeping a certain margin according to the daily accident handling time after large disturbance;
The preset time constant Tsy is a constant value of sustainable discharge time of the energy storage currently being discharged, and is obtained according to the time when the system frequency is not further deteriorated if the power of the energy storage drops to zero in a short time during the fluctuation of the power grid frequency so as to bring additional power shortage;
(2) Acquiring energy storage power, charging power and discharging power of pre-shortage energy storage of each energy storage substation in a power grid, and calculating the modulation quantity of each type of energy storage based on the energy storage power, the charging power and the discharging power;
the first type of energy storage can require the energy storage to be converted into maximum power amplification from a charging state, a standby state or a discharging state, and the modulation quantity is as follows:
Pes1＝Pmax×K+P′es1
Wherein P max is the maximum discharge power of the energy storage, K is the discharge power conversion coefficient, and P' es1 is the energy storage power of the energy storage before the occurrence of power shortage; if the pre-power-shortage energy storage is in a discharging state, P 'es1 is negative, and if the pre-power-shortage energy storage is in a charging state, P' es1 is positive.
The second type of energy storage can be required to be converted into a standby state from a charging state, which is equivalent to load shedding, and the modulation quantity is as follows:
Pes2＝Pcd2
Wherein P cd2 is the charging power of the stored energy before the occurrence of power shortage;
The third type of energy storage has no modulation quantity and cannot be called.
The fourth type of energy storage has the following modulation amounts:
Pes4＝Pcd4
wherein, P cd4 is the discharge power of the energy storage before the occurrence of power shortage.
(3) When modulating energy storage, sequentially calling each type of energy storage according to a preset priority;
After the first type of energy storage is called, the support can be provided for a certain time, but when the electric quantity is always exhausted; after the second type of energy storage is called, the energy storage can be always standby without charging, and the supporting effect can be always maintained. Therefore, after direct current locking, the system protection calls the second type of energy storage preferentially when the modulated energy storage is needed, and calls the first type of energy storage when the second type of energy storage is not enough, and when the adjustable total amount of the first type of energy storage and the second type of energy storage does not meet the total control requirement of the power grid, other control measures are taken to meet the control requirement of the power grid.
(4) The method comprises the steps of obtaining the total modulation amount required by the current class energy storage of each energy storage substation in a power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation.
The modulation quantity required by the current class energy storage of each energy storage substation is as follows:
Wherein D in is the modulation quantity required by the nth class energy storage of the ith energy storage sub-station, P in is the modulation quantity required by the nth class energy storage of the ith energy storage sub-station, D n is the sum of the modulation quantity required by the nth class energy storage of all the energy storage sub-stations, m is the number of the energy storage sub-stations in the power grid, and n is the number of the current class.
Embodiment two:
the embodiment of the invention provides an optimization device for energy storage to participate in low-frequency safe and stable control of a power grid, which comprises the following components:
the energy storage classification module is used for acquiring the remaining duration and the current state of the energy storage of each energy storage substation in the power grid discharged with the maximum power, and classifying the energy storage based on the remaining duration and the current state of the energy storage;
the modulation amount calculating module is used for obtaining the energy storage power, the charging power and the discharging power of the pre-shortage energy storage of each energy storage substation in the power grid and calculating the modulation amount of each type of energy storage based on the energy storage power, the charging power and the discharging power;
The calling module is used for calling each type of energy storage in turn according to a preset priority when modulating the energy storage;
The command issuing module is used for acquiring the total modulation amount required by the current class energy storage of each energy storage substation in the power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation.
Embodiment III:
the embodiment of the invention provides an optimization system for energy storage to participate in low-frequency safe and stable control of a power grid, which comprises a processor and a storage medium;
the storage medium is used for storing instructions;
The processor is operative according to instructions to perform steps according to any one of the methods described above.
Embodiment four:
An embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of any of the methods described above.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (6)
1. An optimization method for energy storage to participate in low-frequency safety and stability control of a power grid is characterized by comprising the following steps:
Acquiring the remaining duration and the current state of energy storage of each energy storage substation in the power grid, wherein the remaining duration and the current state of energy storage are discharged with maximum power, and classifying the energy storage based on the remaining duration and the current state of energy storage;
Acquiring energy storage power, charging power and discharging power of pre-shortage energy storage of each energy storage substation in a power grid, and calculating the modulation quantity of each type of energy storage based on the energy storage power, the charging power and the discharging power;
when modulating energy storage, sequentially calling each type of energy storage according to a preset priority;
Acquiring the total modulation amount required by the current class energy storage of each energy storage substation in the power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation;
The modulation quantity required by the current energy storage of each energy storage substation is as follows:
；
Wherein, Modulation quantity required for nth class energy storage of ith energy storage substation,/>For the nth class energy storage modulation quantity of the ith energy storage substation,/>And the sum of the modulation amounts required by the nth class energy storage of all the energy storage substations is m, the number of the energy storage substations in the power grid is m, and n is the number of the current class.
2. An optimization method for energy storage participation in low frequency safety and stability control of a power grid according to claim 1, wherein the classification of energy storage based on remaining duration and current state of energy storage comprises:
energy storage of the first type: the remaining duration is more than or equal to a preset time fixed value Tmin;
The second type of energy storage: the remaining duration is less than a preset time fixed value Tmin, and the current state of energy storage is a charging state;
third type of energy storage:
The remaining duration is less than a preset time fixed value Tmin, and the energy storage current state is a standby state; or (b)
The residual duration is less than a preset time fixed value Tmin, the current energy storage state is a discharge state, and the discharge time maintained by the discharge state is more than or equal to a preset time fixed value Tsy;
Fourth type of energy storage:
The remaining duration is less than a preset time constant value Tmin, and the current state of the energy storage is a discharge state, and the discharge time maintained by the discharge state is less than a preset time constant value Tsy.
3. The optimization method for energy storage to participate in low-frequency safe and stable control of a power grid according to claim 2, wherein the calculating the modulation amount of each type of energy storage based on the energy storage power, the charging power and the discharging power comprises:
the modulation amount of the first type of energy storage is as follows:
；
Wherein, Maximum discharge power of stored energy,/>Is a discharge power conversion coefficient,/>Energy storage power for storing energy before power shortage occurs;
the modulation quantity of the second type of energy storage is as follows:
；
Wherein, Charging power for storing energy before power shortage occurs;
The third type of energy storage has no modulation quantity;
the modulation quantity of the fourth type of energy storage is as follows:
；
Wherein, The discharge power of the energy storage before the power shortage occurs.
4. An optimizing device for energy storage to participate in low-frequency safety and stability control of a power grid, which is characterized by comprising:
the energy storage classification module is used for acquiring the remaining duration and the current state of the energy storage of each energy storage substation in the power grid discharged with the maximum power, and classifying the energy storage based on the remaining duration and the current state of the energy storage;
the modulation amount calculating module is used for obtaining the energy storage power, the charging power and the discharging power of the pre-shortage energy storage of each energy storage substation in the power grid and calculating the modulation amount of each type of energy storage based on the energy storage power, the charging power and the discharging power;
The calling module is used for calling each type of energy storage in turn according to a preset priority when modulating the energy storage;
The command issuing module is used for acquiring the total modulation amount required by the current class energy storage of each energy storage substation in the power grid, calculating the modulation amount required by the current class energy storage of each energy storage substation according to the modulation amount of the current class energy storage of each energy storage substation, and issuing the modulation amount to each energy storage substation;
The modulation quantity required by the current energy storage of each energy storage substation is as follows:
；
Wherein, Modulation quantity required for nth class energy storage of ith energy storage substation,/>For the nth class energy storage modulation quantity of the ith energy storage substation,/>And the sum of the modulation amounts required by the nth class energy storage of all the energy storage substations is m, the number of the energy storage substations in the power grid is m, and n is the number of the current class.
5. An optimization system for energy storage to participate in low-frequency safety and stability control of a power grid is characterized by comprising a processor and a storage medium;
the storage medium is used for storing instructions;
the processor being operative according to the instructions to perform the steps of the method according to any one of claims 1-3.
6. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-3.
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| CA3121883A1 (en) * | 2018-07-31 | 2020-02-06 | Gree Electric Appliances, Inc. Of Zhuhai | Direct-current power distribution method, device and system |
| CN112310970A (en) * | 2020-09-29 | 2021-02-02 | 国网电力科学研究院有限公司 | Active coordination stability control method, device and system for power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA3121883A1 (en) * | 2018-07-31 | 2020-02-06 | Gree Electric Appliances, Inc. Of Zhuhai | Direct-current power distribution method, device and system |
| CN112310970A (en) * | 2020-09-29 | 2021-02-02 | 国网电力科学研究院有限公司 | Active coordination stability control method, device and system for power grid |
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