CN116505623A - Method, device, equipment and storage medium for distributing discharge power of energy storage power station - Google Patents
Method, device, equipment and storage medium for distributing discharge power of energy storage power station 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application belongs to the technical field of energy storage regulation and control, and discloses a method, a device, equipment and a storage medium for distributing discharge power of an energy storage power station, wherein the method comprises the following steps: step S1, calculating the quasi-discharge power of each cell stack; step S2, calculating a first power difference value of the battery stack, and detecting whether the first power difference value is greater than or equal to 0; step S3, if yes, executing a first correction operation on the cell stack; if not, placing the cell stack into a queue to be distributed; step S4, sequentially executing steps S2-S3 on each cell stack of the energy storage power station; step S5, detecting whether the number of the cell stacks in the queue to be distributed is 0; step S6, if the value is 0, ending; and if not, executing a second correction operation on each cell stack in the queue to be distributed. The method and the device avoid the reduction of the overall dischargeable power of the energy storage power station, and ensure the stability of the dischargeable power of the energy storage power station.
Description
Technical Field
The application relates to the technical field of energy storage regulation and control, in particular to a method, a device, equipment and a storage medium for distributing discharge power of an energy storage power station.
Background
And after being connected in parallel, the plurality of battery clusters are connected with an energy storage converter to form a battery stack, and then the battery stack is connected with a power grid through the voltage of a transformer to a grid connection point. The energy storage power station comprises a plurality of battery stacks, and the power station generally distributes discharge power to each battery stack according to the charge state of each battery stack, namely, the power station has high charge and high discharge power and low charge and low discharge power.
However, the discharging duration is not considered by the distribution method in the prior art, and when the states of charge states of each cell stack are not consistent, the maximum dischargeable power of the energy storage power station may be changed: assuming that two stacks of the same specification are discharged simultaneously, their initial SOCs are soc=100% and soc=30%, respectively. If the discharge power of the former is set to 2 times that of the latter, after a period of time T, the initial soc=30% of the stack is charged, and the initial soc=100% of the stack still has 40% of the charge remaining. If the discharge time is greater than T, the stack with the initial soc=30% of energy depleted can no longer provide discharge power, resulting in a reduction in the overall dischargeable power of the system. Therefore, only when the electric quantity of each battery stack after each discharge is close to each other, the situation of reducing the overall dischargeable power of the system can be fundamentally avoided.
Therefore, in the prior art, the discharge time is not considered when the discharge power is distributed, so that the states of charge SOC after the discharge of each cell stack is ended are different, and the total dischargeable power of the energy storage power station is reduced.
Disclosure of Invention
The application provides a method, a device, equipment and a storage medium for distributing discharge power of an energy storage power station, which can enable the final SOC to be nearly consistent after each cell stack outputs according to the intended discharge power, avoid the reduction of the overall dischargeable power of the energy storage power station and ensure the stability of the dischargeable power of the energy storage power station.
In a first aspect, the present application provides a method for distributing discharge power of an energy storage power station, where the method is applied to an energy storage control device, and the method includes:
step S1, calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration, the charge state of each cell stack of the energy storage power station and the number of the cell stacks;
step S2, obtaining a first power difference value of the battery stack according to the to-be-discharged power and the maximum dischargeable power of the battery stack, and detecting whether the first power difference value is greater than or equal to 0;
step S3, if yes, performing a first correction operation on the to-be-discharged power of the cell stack, and putting a first power difference value corresponding to the cell stack into a difference value set; if not, placing the cell stack into a queue to be distributed;
step S4, sequentially executing steps S2-S3 on each cell stack of the energy storage power station;
step S5, detecting whether the number of the cell stacks in the queue to be distributed is 0;
step S6, if the value is 0, ending; and if the power is not 0, executing a second correction operation on the quasi-discharge power of each cell stack in the queue to be distributed to obtain the corrected quasi-discharge power of each cell stack.
Further, the method further comprises:
step S7, obtaining a second power difference value of the cell stack according to the corrected quasi-discharge power and the maximum dischargeable power of the cell stack, and detecting whether the second power difference value is greater than or equal to 0;
step S8, if yes, a third correction operation is carried out on the corrected quasi-discharge power of the cell stack, and a second power difference value corresponding to the cell stack is put into a difference value set; if not, placing the cell stack into a redistribution queue;
step S9, after each cell stack in the queue to be distributed is sequentially executed with steps S7-S8, detecting whether the number of the cell stacks in the redistribution queue is 0;
step S10, if the value is 0, ending; if not, taking the reassigned queue as a queue to be assigned, taking the corrected quasi-discharge power of each cell stack in the queue to be assigned as the quasi-discharge power of each cell stack, and returning to the step S5 until the number of the cell stacks in the queue to be assigned is 0.
Further, the performing a first correction operation on the pseudo discharge power of the stack includes:
the quasi-discharge power of the cell stack is corrected downward to the maximum dischargeable power of the cell stack.
Further, the performing a second correction operation on the quasi-discharge power of each cell stack in the queue to be allocated to obtain a corrected quasi-discharge power of each cell stack includes:
adding the first power differences or the second power differences in the difference set to obtain a difference sum;
performing a second correction operation on the quasi-discharge power of each cell stack according to the sum of the number of the cell stacks in the queue to be distributed and the difference value to obtain corrected quasi-discharge power of each cell stack; the difference set is set to the null set.
Further, the performing a second correction operation on the quasi-discharge power of each cell stack according to the sum of the number of cell stacks and the difference value in the to-be-allocated queue to obtain a corrected quasi-discharge power of each cell stack, including:
calculating the ratio of the sum of the differences to the number of the cell stacks in the queue to be distributed; and respectively adding the ratio to the quasi-discharge power of each cell stack in the queue to be distributed to obtain the corrected quasi-discharge power of each cell stack.
Further, the performing a third correction operation on the corrected quasi-discharge power of the cell stack includes:
the corrected quasi-discharge power of the cell stack is corrected downward to the maximum dischargeable power of the cell stack.
Further, the calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration, the charge state of each cell stack of the energy storage power station and the number of the cell stacks includes: deducing according to the total power to be discharged, the duration to be discharged, the number of cell stacks in the energy storage power station, the charge states and the energy of each cell stack to obtain a power distribution strategy formula; and inputting the charge states of the battery stacks into a power distribution strategy formula to obtain the quasi-discharge power of each battery stack.
In a second aspect, the present application provides an energy storage power station discharge power distribution apparatus, the apparatus being applied to an energy storage control device, the apparatus comprising:
the quasi-discharge power calculation module is used for calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration time, the charge states of each cell stack of the energy storage power station and the number of the cell stacks;
the first difference calculation module is used for obtaining a first power difference value of the battery stack according to the to-be-discharged power and the maximum dischargeable power of the battery stack and detecting whether the first power difference value is greater than or equal to 0;
the first correction module is used for executing first correction operation on the to-be-discharged power of the cell stack when the first power difference value is greater than or equal to 0, placing the first power difference value corresponding to the cell stack into a difference value set, and placing the cell stack into a queue to be distributed when the first power difference value is less than 0;
the first traversing module is used for traversing the first difference value calculating module and the first correcting module for each cell stack of the energy storage power station in sequence;
the detection module is used for detecting whether the number of the cell stacks in the queue to be distributed is 0;
and the second correction module is used for ending the power distribution when the number of the battery stacks is 0, and executing a second correction operation on the quasi-discharge power of each battery stack in the queue to be distributed when the number of the battery stacks is not 0, so as to obtain the corrected quasi-discharge power of each battery stack.
Further, the device further comprises:
the second difference calculation module is used for obtaining a second power difference value of the cell stack according to the corrected quasi-discharge power and the maximum dischargeable power of the cell stack and detecting whether the second power difference value is greater than or equal to 0;
the third correction module is used for executing a third correction operation on the corrected quasi-discharge power of the cell stack when the second power difference value is greater than or equal to 0, and placing the second power difference value corresponding to the cell stack into a difference value set; and is further configured to stack the batteries into a redistribution queue when the second power difference is less than 0;
the second traversing module is used for traversing each cell stack in the queue to be distributed in sequence to a second difference value calculating module and a third correcting module and detecting whether the number of the cell stacks in the redistribution queue is 0;
and the resetting module is used for ending the power distribution when the number of the battery stacks is 0, taking the reassigned queue as a queue to be distributed when the number of the battery stacks is not 0, taking the corrected quasi-discharge power of each battery stack in the queue to be distributed as the quasi-discharge power of each battery stack, and returning to the detection module until the number of the battery stacks in the queue to be distributed is 0.
Further, the first correction module is used for correcting the quasi-discharge power of the cell stack downwards to the maximum dischargeable power of the cell stack.
Further, the second correction module further includes:
the difference sum calculating unit is used for adding a plurality of first power differences or a plurality of second power differences in the difference set to obtain a difference sum;
the second correction power unit is used for executing a second correction operation on the quasi-discharge power of each cell stack according to the sum of the number of the cell stacks in the queue to be distributed and the difference value to obtain the corrected quasi-discharge power of each cell stack;
and the empty set unit is used for setting the difference value set as an empty set.
Further, the second correction power unit is configured to calculate a ratio of the sum of the differences to the number of stacks in the queue to be allocated, and add the ratio to the pseudo-discharge power of each stack in the queue to be allocated, so as to obtain the corrected pseudo-discharge power of each stack.
Further, the third correction module is used for correcting the corrected quasi-discharge power of the cell stack downwards to the maximum dischargeable power of the cell stack.
Further, the quasi-discharge power calculation module is used for deriving according to the quasi-discharge total power, the quasi-discharge duration, the number of cell stacks in the energy storage power station, the charge states of the cell stacks and the energy to obtain a power distribution strategy formula; and inputting the charge states of the battery stacks into a power distribution strategy formula to obtain the quasi-discharge power of each battery stack.
In a third aspect, the present application provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the steps of any of the energy storage power station discharge power distribution methods described above when the computer program is executed.
In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the energy storage plant discharge power distribution methods described above.
To sum up, compare with prior art, the beneficial effect that this application provided technical scheme brought includes at least:
according to the energy storage power station discharge power distribution method, the quasi-discharge duration time is considered when the quasi-discharge power of the battery stack is calculated; when the calculated quasi-discharge power exceeds the maximum dischargeable power of the corresponding cell stack, namely, the first power difference value is more than or equal to 0, performing first correction operation on the quasi-discharge power of the cell stack, and performing second correction operation on the cell stack with the quasi-discharge power smaller than the maximum dischargeable power; after each cell stack outputs the power according to the power to be discharged, the final SOC is nearly consistent, the situation that the power to be discharged is distributed until the electric quantity of the cell stack is exhausted is avoided, the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
Drawings
Fig. 1 is a flowchart of a method for distributing discharge power of an energy storage power station according to an exemplary embodiment of the present application.
Fig. 2 is a flowchart of a method for distributing discharge power of an energy storage power station according to another exemplary embodiment of the present application.
FIG. 3 is a flowchart of a second corrective action provided in one exemplary embodiment of the present application.
Fig. 4 is a block diagram of a discharge power distribution device of an energy storage power station according to an exemplary embodiment of the present application.
Fig. 5 is a block diagram of a discharge power distribution device of an energy storage power station according to another exemplary embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, an embodiment of the present application provides a method for distributing discharge power of an energy storage power station, where the method is applied to an energy storage control device, and the implementation subject is illustrated by taking the energy storage control device as an example, and the method specifically may include the following steps:
and step S1, calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration, the charge state of each cell stack of the energy storage power station and the number of the cell stacks.
The quasi-discharge power is the discharge power which is distributed to the corresponding battery pile by the energy storage power station and is to be output.
Specifically, the formula for calculating the power to be generated is:
wherein i and k are the numbers of the battery stacks in the sum calculation process, k is not equal to i, N is the number of the battery stacks of the energy storage power station, E is the energy of each battery stack,for the state of charge of the ith stack, < >>For the power to be generated by the ith stack,/->The total output power required to reach for the power grid, namely the total power to be discharged, and T is the duration to be discharged.
And S2, obtaining a first power difference value of the battery stack according to the quasi-discharge power and the maximum dischargeable power of the battery stack, and detecting whether the first power difference value is greater than or equal to 0.
Specifically, the quasi-discharge power minus the maximum dischargeable power yields a first power difference.
Step S3, if yes, performing a first correction operation on the to-be-discharged power of the cell stack, and putting a first power difference value corresponding to the cell stack into a difference value set; if not, the cell stack is put into a queue to be distributed.
And S4, sequentially executing steps S2-S3 on each cell stack of the energy storage power station.
Step S5, detecting whether the number of the cell stacks in the queue to be distributed is 0.
Step S6, if the value is 0, ending; and if the power is not 0, executing a second correction operation on the quasi-discharge power of each cell stack in the queue to be distributed to obtain the corrected quasi-discharge power of each cell stack.
In a specific implementation process, the second correction operation is to distribute the part of the discharge power which cannot be born by the cell stack performing the first correction operation to the cell stacks in the queue to be distributed.
The method for distributing the discharge power of the energy storage power station provided by the embodiment considers the duration of the quasi-discharge when calculating the quasi-discharge power of the cell stack; when the calculated quasi-discharge power exceeds the maximum dischargeable power of the corresponding cell stack, namely, the first power difference value is more than or equal to 0, performing first correction operation on the quasi-discharge power of the cell stack, and performing second correction operation on the cell stack with the quasi-discharge power smaller than the maximum dischargeable power; after each cell stack outputs the power according to the power to be discharged, the final SOC is nearly consistent, the situation that the power to be discharged is distributed until the electric quantity of the cell stack is exhausted is avoided, the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, referring to fig. 2, the method specifically may further include:
and S7, obtaining a second power difference value of the cell stack according to the corrected quasi-discharge power and the maximum dischargeable power of the cell stack, and detecting whether the second power difference value is greater than or equal to 0.
Specifically, the corrected quasi-discharge power minus the maximum dischargeable power yields a second power difference.
Step S8, if yes, a third correction operation is carried out on the corrected quasi-discharge power of the cell stack, and a second power difference value corresponding to the cell stack is put into a difference value set; if not, stacking the batteries into a reassignment queue.
And S9, after each cell stack in the queue to be distributed is sequentially executed with steps S7-S8, detecting whether the number of the cell stacks in the redistribution queue is 0.
Step S10, if the value is 0, ending; if not, taking the reassigned queue as a queue to be assigned, taking the corrected quasi-discharge power of each cell stack in the queue to be assigned as the quasi-discharge power of each cell stack, and returning to the step S5 until the number of the cell stacks in the queue to be assigned is 0.
According to the method for distributing the discharge power of the energy storage power station, the comparison of the corrected quasi-discharge power and the maximum dischargeable power is carried out again on the cell stack executing the second correction operation, so that the situation that the original quasi-discharge power is smaller than the maximum dischargeable power and the corrected quasi-discharge power is larger than the maximum dischargeable power after the cell stack in the queue to be distributed bears the discharge power more is avoided, the reduction of the overall dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, referring to fig. 2, the performing the first correction operation on the pseudo-discharge power of the cell stack includes:
the quasi-discharge power of the cell stack is corrected downward to the maximum dischargeable power of the cell stack.
When the quasi-discharge power is larger than the maximum dischargeable power, the quasi-discharge power is adjusted down to the maximum dischargeable power of the corresponding cell stack, so that the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
Referring to fig. 3, in some embodiments, the performing the second correction operation on the pseudo-discharge power of each stack in the queue to be allocated to obtain the corrected pseudo-discharge power of each stack may specifically include:
step S61, a plurality of first power differences or a plurality of second power differences in the difference set are added to obtain a difference sum.
Step S62, a second correction operation is carried out on the quasi-discharge power of each cell stack according to the sum of the number of the cell stacks in the queue to be distributed and the difference value, and the corrected quasi-discharge power of each cell stack is obtained.
Step S63, the difference set is set to an empty set.
The above embodiment distributes the sum of the differences obtained by adding the plurality of first power differences or the plurality of second power differences to the stacks in the queue to be distributed on average; because the quasi-discharge power of the cell stacks in the queue to be distributed is smaller than the maximum dischargeable power, more discharge power can be born, so that the output power reduced by the fact that the quasi-discharge power is reduced to the maximum dischargeable power is born by the surplus cell stacks in the queue to be distributed, the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, the performing a second correction operation on the pseudo-discharge power of each stack according to the sum of the number of stacks and the difference value in the queue to be allocated to obtain a corrected pseudo-discharge power of each stack may specifically include:
calculating the ratio of the sum of the differences to the number of the cell stacks in the queue to be distributed; and respectively adding the ratio to the quasi-discharge power of each cell stack in the queue to be distributed to obtain the corrected quasi-discharge power of each cell stack.
The specific calculation formula is as follows:
where j is the stack number,for the corrected quasi-discharge power of the j-th cell stack in the queue to be distributed,for the power to be discharged of the jth stack in the queue to be allocated, < >>Is the sum of differences>Is the number of stacks in the queue to be allocated.
The embodiment evenly distributes the output power reduced by the reduction of the maximum dischargeable power of the quasi-discharge power to the cell stacks with surplus cells in the queue to be distributed, thereby avoiding the reduction of the whole dischargeable power of the energy storage power station and ensuring the stability of the dischargeable power of the energy storage power station.
In some embodiments, performing the third correction operation on the corrected pseudo-discharge power of the cell stack may include:
the corrected quasi-discharge power of the cell stack is corrected downward to the maximum dischargeable power of the cell stack.
After the second correction operation is executed, the cell stack with the to-be-discharged power exceeding the maximum dischargeable power is corrected, so that the discharge power of the cell stack is changed into the maximum dischargeable power, the cell stack which is exhausted and still does not reach the power index after the second correction operation is finished is avoided, the reduction of the overall dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, calculating the quasi-discharge power of each stack according to the quasi-discharge total power, the quasi-discharge duration, the state of charge of each stack of the energy storage power station and the number of stacks may include: deducing according to the total power to be discharged, the duration to be discharged, the number of cell stacks in the energy storage power station, the charge states and the energy of each cell stack to obtain a power distribution strategy formula; and inputting the charge states of the battery stacks into a power distribution strategy formula to obtain the quasi-discharge power of each battery stack.
．．．
Wherein, the liquid crystal display device comprises a liquid crystal display device,，/>the power to be discharged allocated to each stack is N, the number of stacks,/-for each stack>Total output power required for the network, i.e. total power to be discharged, +.>，/>E is the energy of each stack for the state of charge of each stack, +.>The method is characterized in that the equal charge state of each cell stack is required to be reached after the discharge is finished, T is the duration of the quasi-discharge, i is the number of the cell stack, and the obtained power distribution strategy formula is as follows:
according to the embodiment, the quasi-discharge duration is added to the process of calculating the quasi-discharge power of the cell stacks, so that the final SOC (state of charge) of each cell stack is nearly consistent after the cell stacks are output according to the quasi-discharge power, the situation that the cell stacks do not reach the distributed quasi-discharge power until the electric quantity is exhausted is avoided, the reduction of the overall dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
Referring to fig. 4, another embodiment of the present application provides a discharge power distribution device of an energy storage power station, where the device is applied to an energy storage control device, and the device may specifically include:
the quasi-discharge power calculation module 101 is configured to calculate quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration, the state of charge of each cell stack of the energy storage power station, and the number of cell stacks.
The first difference calculating module 102 is configured to obtain a first power difference of the stack according to the to-be-discharged power and the maximum dischargeable power of the stack, and detect whether the first power difference is greater than or equal to 0.
The first correction module 103 is configured to perform a first correction operation on the to-be-discharged power of the cell stack when the first power difference is greater than or equal to 0, and place the first power difference corresponding to the cell stack into the difference set, and also be used to place the cell stack into the queue to be allocated when the first power difference is less than 0.
The first traversing module 104 is configured to sequentially traverse the first difference calculating module and the first correcting module for each cell stack of the energy storage power station.
A detecting module 105, configured to detect whether the number of stacks in the queue to be allocated is 0.
The second correction module 106 is configured to end power distribution when the number of stacks is 0, and further configured to perform a second correction operation on the pseudo-discharge power of each stack in the queue to be distributed when the number of stacks is not 0, so as to obtain corrected pseudo-discharge power of each stack.
The above embodiment provides a discharge power distribution device of an energy storage power station, wherein the quasi-discharge power calculation module 101 considers the quasi-discharge duration time when calculating the quasi-discharge power of the battery stack; when the calculated quasi-discharge power exceeds the maximum dischargeable power of the corresponding cell stack, namely, the first power difference value is more than or equal to 0, performing a first correction operation on the quasi-discharge power of the cell stack by the first correction module 103, and performing a second correction operation on the cell stack with the quasi-discharge power smaller than the maximum dischargeable power by the second correction module 106; after each cell stack outputs the power according to the power to be discharged, the final SOC is nearly consistent, the situation that the power to be discharged is distributed until the electric quantity of the cell stack is exhausted is avoided, the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
Referring to fig. 5, in some embodiments, the apparatus may further include:
the second difference calculating module 107 is configured to obtain a second power difference of the stack according to the corrected quasi-discharge power and the maximum dischargeable power of the stack, and detect whether the second power difference is greater than or equal to 0.
A third correction module 108, configured to perform a third correction operation on the corrected pseudo-discharge power of the cell stack when the second power difference is greater than or equal to 0, and put the second power difference corresponding to the cell stack into the difference set; and is further configured to stack the cells into a reassignment queue when the second power difference is less than 0.
A second traversing module 109, configured to sequentially traverse the second difference calculating module and the third correcting module for each stack in the queue to be allocated, and detect whether the number of stacks in the reallocation queue is 0.
The reset module 110 is configured to end power distribution when the number of stacks is 0, and is further configured to use the redistribution queue as a queue to be distributed when the number of stacks is not 0, use the corrected pseudo-discharge power of each stack in the queue to be distributed as the pseudo-discharge power of each stack, and return to the detection module until the number of stacks in the queue to be distributed is 0.
In the device for distributing the discharge power of the energy storage power station provided in the foregoing embodiment, the second difference calculating module 107 compares the corrected quasi-discharge power with the maximum dischargeable power again for the stack performing the second correction operation, so that the situation that the original quasi-discharge power is smaller than the maximum dischargeable power and the corrected quasi-discharge power is larger than the maximum dischargeable power after the stack in the queue to be distributed bears the discharge power more is avoided, thereby avoiding the reduction of the overall dischargeable power of the energy storage power station and ensuring the stability of the dischargeable power of the energy storage power station.
In some embodiments, the first correction module 103 is configured to correct the quasi-discharge power of the cell stack downward to the maximum dischargeable power of the cell stack.
When the quasi-discharge power is larger than the maximum dischargeable power, the quasi-discharge power is adjusted down to the maximum dischargeable power of the corresponding cell stack, so that the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, the second correction module 106 may further include:
and the difference sum calculating unit is used for adding the plurality of first power differences or the plurality of second power differences in the difference set to obtain a difference sum.
And the second correction power unit is used for executing a second correction operation on the quasi-discharge power of each cell stack according to the sum of the number of the cell stacks in the queue to be distributed and the difference value to obtain the corrected quasi-discharge power of each cell stack.
And the empty set unit is used for setting the difference value set as an empty set.
In the above embodiment, the second correction power unit is used for evenly distributing the difference sum of the first power differences or the second power differences to the stacks in the queue to be distributed; because the quasi-discharge power of the cell stacks in the queue to be distributed is smaller than the maximum dischargeable power, more discharge power can be born, so that the output power reduced by the fact that the quasi-discharge power is reduced to the maximum dischargeable power is born by the surplus cell stacks in the queue to be distributed, the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, the second correction power unit is configured to calculate a ratio of the sum of the differences to the number of stacks in the queue to be allocated, and add the ratio to the pseudo-discharge power of each stack in the queue to be allocated, to obtain the corrected pseudo-discharge power of each stack.
According to the embodiment, the output power reduced by the maximum dischargeable power which is adjusted downwards by the power to be discharged is averagely distributed to the cell stacks with surplus cells in the queue to be distributed through the second correction power unit, so that the reduction of the whole dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
In some embodiments, the third correction module 108 is configured to correct the corrected pseudo-discharge power of the stack downward to the maximum dischargeable power of the stack.
In the above embodiment, after the second correction operation is performed, the third correction module 108 corrects the cell stack whose to-be-discharged power exceeds the maximum dischargeable power, so that the discharge power of the cell stack is changed to the maximum dischargeable power, and the cell stack whose power index is not reached yet due to the electric quantity exhaustion after the second correction operation is completed is avoided, thereby avoiding the reduction of the overall dischargeable power of the energy storage power station and ensuring the stability of the dischargeable power of the energy storage power station.
In some embodiments, the quasi-discharge power calculation module 101 is configured to derive a power distribution strategy formula according to the total quasi-discharge power, the quasi-discharge duration, the number of stacks in the energy storage power station, the state of charge of each stack, and the energy; and inputting the charge states of the battery stacks into a power distribution strategy formula to obtain the quasi-discharge power of each battery stack.
In the above embodiment, the quasi-discharge duration is added to the process of calculating the quasi-discharge power of the battery stacks through the quasi-discharge power calculation module 101, so that after each battery stack outputs according to the quasi-discharge power, the final SOC is nearly uniform, the situation that the battery stacks do not reach the allocated quasi-discharge power until the electric quantity is exhausted is avoided, the reduction of the overall dischargeable power of the energy storage power station is avoided, and the stability of the dischargeable power of the energy storage power station is ensured.
The specific limitation of the discharging power distribution device of an energy storage power station provided in this embodiment can be referred to the above embodiments of the discharging power distribution method of an energy storage power station, and will not be described herein. Each module in the discharging power distribution device of the energy storage power station can be fully or partially realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Embodiments of the present application provide a computer device that may include a processor, memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, causes the processor to perform the steps of a method for distributing discharge power of an energy storage power station according to any of the embodiments described above.
The working process, working details and technical effects of the computer device provided in this embodiment may be referred to the above embodiments of a discharge power distribution method of an energy storage power station, which are not described herein.
An embodiment of the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a discharge power distribution method of an energy storage power station as in any of the embodiments above. The computer readable storage medium refers to a carrier for storing data, and may include, but is not limited to, a floppy disk, an optical disk, a hard disk, a flash Memory, and/or a Memory Stick (Memory Stick), etc., where the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The working process, working details and technical effects of the computer readable storage medium provided in this embodiment can be referred to the above embodiments of a discharge power distribution method of an energy storage power station, which are not described herein.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), memory bus dynamic RAM (RDRAM), and the like.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (16)
1. A method for distributing discharge power of an energy storage power station, the method comprising:
step S1, calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration, the charge state of each cell stack of the energy storage power station and the number of the cell stacks;
step S2, obtaining a first power difference value of the cell stack according to the quasi-discharge power and the maximum dischargeable power of the cell stack, and detecting whether the first power difference value is greater than or equal to 0;
step S3, if yes, performing a first correction operation on the to-be-discharged power of the cell stack, and putting the first power difference value corresponding to the cell stack into a difference value set; if not, placing the cell stack into a queue to be distributed;
step S4, sequentially executing steps S2-S3 on each cell stack of the energy storage power station;
step S5, detecting whether the number of the cell stacks in the queue to be distributed is 0;
step S6, if the value is 0, ending; and if the power is not 0, performing a second correction operation on the quasi-discharge power of each cell stack in the queue to be distributed to obtain corrected quasi-discharge power of each cell stack.
2. The method according to claim 1, wherein the method further comprises:
step S7, obtaining a second power difference value of the cell stack according to the corrected quasi-discharge power and the maximum dischargeable power of the cell stack, and detecting whether the second power difference value is greater than or equal to 0;
step S8, if yes, a third correction operation is carried out on the corrected quasi-discharge power of the cell stack, and the second power difference value corresponding to the cell stack is put into the difference value set; if not, stacking the batteries into a reassignment queue;
step S9, after steps S7-S8 are sequentially executed on each cell stack in the queue to be distributed, detecting whether the number of the cell stacks in the redistribution queue is 0;
step S10, if the value is 0, ending; and if not, taking the reassigned queue as the queue to be assigned, taking the corrected quasi-discharge power of each cell stack in the queue to be assigned as the quasi-discharge power of each cell stack, and returning to the step S5 until the number of the cell stacks in the queue to be assigned is 0.
3. The method of claim 1, wherein the performing a first corrective action on the quasi-discharge power of the stack comprises:
and correcting the quasi-discharge power of the cell stack downwards to be the maximum dischargeable power of the cell stack.
4. The method of claim 2, wherein performing a second correction operation on the pseudo-discharge power of each of the stacks in the queue to be allocated to obtain corrected pseudo-discharge power of each of the stacks comprises:
adding the plurality of first power differences or the plurality of second power differences in the difference set to obtain a difference sum;
performing the second correction operation on the quasi-discharge power of each cell stack according to the sum of the number of the cell stacks in the queue to be distributed and the difference value to obtain the corrected quasi-discharge power of each cell stack;
and setting the difference value set as an empty set.
5. The method of claim 4, wherein said performing said second correction operation on said pseudo-discharge power of each of said stacks based on a sum of said difference and a number of said stacks in said queue to be allocated to obtain said corrected pseudo-discharge power of each of said stacks comprises:
calculating the ratio of the sum of the differences to the number of the cell stacks in the queue to be distributed;
and adding the ratio to the quasi-discharge power of each cell stack in the queue to be distributed to obtain the corrected quasi-discharge power of each cell stack.
6. The method of claim 2, wherein the performing a third correction operation on the corrected pseudo discharge power of the cell stack comprises:
and correcting the corrected quasi-discharge power of the cell stack downwards to the maximum dischargeable power of the cell stack.
7. The method of claim 1, wherein calculating the quasi-discharge power for each stack of the energy storage plant based on the total quasi-discharge power, the quasi-discharge duration, the state of charge of each stack, and the number of stacks comprises:
deducing according to the total power to be discharged, the duration to be discharged, the number of the battery stacks in the energy storage power station, the state of charge of each battery stack and the energy to obtain a power distribution strategy formula; and inputting the charge states of the battery stacks into the power distribution strategy formula to obtain the quasi-discharge power of the battery stacks.
8. An energy storage power station discharge power distribution device, characterized by being applied to energy storage control equipment, the device comprising:
the quasi-discharge power calculation module is used for calculating the quasi-discharge power of each cell stack according to the quasi-discharge total power, the quasi-discharge duration time, the charge states of the cell stacks of the energy storage power station and the number of the cell stacks;
the first difference calculation module is used for obtaining a first power difference value of the battery stack according to the to-be-discharged power and the maximum dischargeable power of the battery stack and detecting whether the first power difference value is greater than or equal to 0;
the first correction module is used for executing a first correction operation on the to-be-discharged power of the cell stack when the first power difference value is greater than or equal to 0, placing the first power difference value corresponding to the cell stack into a difference value set, and placing the cell stack into a queue to be distributed when the first power difference value is less than 0;
the first traversing module is used for traversing the first difference value calculating module and the first correcting module for each battery stack of the energy storage power station in sequence;
the detection module is used for detecting whether the number of the cell stacks in the queue to be distributed is 0;
and the second correction module is used for ending power distribution when the number of the battery stacks is 0, and executing a second correction operation on the quasi-discharge power of each battery stack in the queue to be distributed when the number of the battery stacks is not 0, so as to obtain the corrected quasi-discharge power of each battery stack.
9. The apparatus of claim 8, wherein the apparatus further comprises:
a second difference calculation module, configured to obtain a second power difference of the cell stack according to the corrected quasi-discharge power and the maximum dischargeable power of the cell stack, and detect whether the second power difference is greater than or equal to 0;
the third correction module is used for executing a third correction operation on the corrected quasi-discharge power of the cell stack when the second power difference value is greater than or equal to 0, and placing the second power difference value corresponding to the cell stack into the difference value set; and when the second power difference is less than 0, placing the cell stack into a redistribution queue;
a second traversing module, configured to sequentially traverse, for each of the stacks in the queue to be allocated, the second difference calculating module and the third correcting module, and detect whether the number of stacks in the reallocation queue is 0;
and the reset module is used for ending power distribution when the number of the battery stacks is 0, taking the reassigned queue as the queue to be distributed when the number of the battery stacks is not 0, taking the corrected quasi-discharge power of each battery stack in the queue to be distributed as the quasi-discharge power of each battery stack, and returning to the detection module until the number of the battery stacks in the queue to be distributed is 0.
10. The apparatus of claim 8, wherein the first correction module is configured to correct the quasi-discharge power of the stack downward to a maximum dischargeable power of the stack.
11. The apparatus of claim 9, wherein the second correction module further comprises:
a difference sum calculating unit, configured to add the plurality of first power differences or the plurality of second power differences in the difference set to obtain a difference sum;
a second correction power unit, configured to perform the second correction operation on the pseudo-discharge power of each of the stacks according to the sum of the number of stacks in the queue to be allocated and the difference value, so as to obtain the corrected pseudo-discharge power of each of the stacks;
and the empty set unit is used for setting the difference set as an empty set.
12. The apparatus of claim 11, wherein the second correction power unit is configured to calculate a ratio of the sum of the differences to the number of stacks in the queue to be allocated, and to add the ratio to the pseudo-discharge power of each stack in the queue to be allocated to obtain the corrected pseudo-discharge power of each stack.
13. The apparatus of claim 9, wherein the third correction module is configured to correct the corrected pseudo-discharge power of the stack downward to a maximum dischargeable power of the stack.
14. The apparatus of claim 8, wherein the quasi-discharge power calculation module is configured to derive a power distribution strategy formula from the total quasi-discharge power, the quasi-discharge duration, the number of stacks in the energy storage power station, the state of charge of each stack, and energy; and inputting the charge state of each cell stack into the power distribution strategy formula to obtain the quasi-discharge power of each cell stack.
15. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 7 when the computer program is executed.
16. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.
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