CN110112761B - Energy storage constant volume method, device and equipment suitable for power plant energy storage auxiliary frequency modulation - Google Patents
Energy storage constant volume method, device and equipment suitable for power plant energy storage auxiliary frequency modulation Download PDFInfo
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- CN110112761B CN110112761B CN201910307593.9A CN201910307593A CN110112761B CN 110112761 B CN110112761 B CN 110112761B CN 201910307593 A CN201910307593 A CN 201910307593A CN 110112761 B CN110112761 B CN 110112761B
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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
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Abstract
The invention discloses an energy storage constant volume method, device and equipment suitable for power plant energy storage auxiliary frequency modulation, wherein the method comprises the steps of obtaining power plant equipment parameters and power plant actual operation data; the surplus capacity of the high-voltage station transformer for energy storage access is obtained through calculation; determining the energy storage capacity with optimal economic benefit; when the first standard is met, the final energy storage type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit; and when the second standard is met, if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, enabling the energy storage final type selection capacity to be equal to or less than the energy storage capacity with the optimal economic benefit, and if the energy storage capacity with the optimal economic benefit is greater than the abundant capacity, enabling the energy storage final type selection capacity to be less than the abundant capacity so as to pass electrical safety check. The invention can realize that the high-voltage power station becomes not overloaded during energy storage charging and avoid the phenomenon that active power is reversely transmitted to the high-voltage side of the high-voltage power station during energy storage discharging.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an energy storage constant volume method, device and equipment suitable for power plant energy storage auxiliary frequency modulation.
Background
In the operation of a power system, the problem of random active imbalance in a regional power grid in a short time (second or minute level) is solved, namely the control of the power grid frequency and the power of a tie line is mainly realized through Automatic Generation Control (AGC). The method has the advantages of high requirements on the performance of the frequency modulation power supply, such as high regulation speed, high regulation precision, frequent switching of power regulation direction and the like.
The AGC frequency modulation function of the power grid is mainly provided by conventional power supplies including hydroelectric power units, gas units and thermal power units. Because the power supply systems have response inertia, a series of complex processes are carried out when primary energy is converted into electric energy, and particularly, the AGC frequency modulation performance of a thermal power generating unit has a larger difference from the expected AGC frequency modulation performance of a power grid, and the AGC frequency modulation performance of the thermal power generating unit is represented by the current situations of regulation delay, deviation (overshoot and undershoot), and the like.
For an energy storage system, within a rated power range, the output of specified power can be completed within 1 second with the accuracy of more than 99 percent, and the comprehensive response capability of the energy storage system is particularly suitable for the power conversion requirement within the AGC frequency modulation time scale. According to the research report, the following results are shown: on average, the frequency modulation effect of the energy storage system is 1.4 times that of a hydroelectric generating set, 2.3 times that of a natural gas generating set and more than 20 times that of a coal-fired generating set.
The energy storage auxiliary frequency modulation principle is that the characteristics of quick and accurate response of a battery energy storage system are utilized to assist a generator set to carry out load adjustment in an AGC mode, so that the adjusting performance of the generator set is improved, and meanwhile, disturbance is not brought to self adjustment of the generator set. Therefore, configuring the battery energy storage system to assist AGC joint frequency modulation is a necessary trend for all gensets.
The principle of the access mode of the energy storage system at the power plant side must not affect the normal operation of a unit and a power grid, the normal operation of auxiliary equipment for a plant and the switching flexibility of the plant. At present, most of access schemes for adding an energy storage system to a power plant adopt an external service bus access scheme, namely, an energy storage frequency modulation device is connected to a 6kV service working section of a unit of the power plant by a power cable and is accessed to a service electric system of the power plant.
In the energy storage combined frequency modulation project, a common capacity configuration method of an energy storage system is mainly based on the frequency modulation characteristic of a power grid. Because the frequency modulation instruction of 80% is about 3% of the full capacity of the unit, 3% of the unit capacity is selected as the energy storage power, and the energy storage system can respond to the power grid AGC instruction of about 80%.
In the prior art, domestic energy storage auxiliary frequency modulation projects are all based on a coal-fired unit, and an energy storage constant volume method is also based on the operating characteristics of the coal-fired unit. For more than 30 ten thousand coal-fired units, the service power rate is generally about 3% -6%, so that the variable capacity of the high plant only needs to be calculated, the high plant is ensured not to be overloaded when the energy storage system is charged, but the service load consumption condition when the energy storage system is discharged is not considered. For a gas-steam combined cycle power plant, because the plant power consumption rate is low and is generally below 2%, if 3% of unit capacity is selected as the energy storage power, the phenomenon that active power is sent to the high-voltage side of the plant in a reverse mode may occur during energy storage discharge. In addition, 3% of unit capacity is selected as energy storage power, and for power plants with the same capacity, the selected energy storage power is the same, and the difference of unit performance among the power plants is not considered.
Disclosure of Invention
The embodiment of the invention provides an energy storage constant volume method, device and equipment suitable for energy storage auxiliary frequency modulation of a power plant, so that the phenomenon that a high-voltage plant becomes not overloaded during energy storage charging and active power is transferred to a high-voltage side of the high-voltage plant during energy storage discharging is effectively realized, and the economic benefit is optimal.
In a first aspect, an embodiment of the present invention provides an energy storage constant volume method suitable for energy storage auxiliary frequency modulation in a power plant, which at least includes the following steps:
acquiring power plant equipment parameters and power plant actual operation data;
calculating to obtain the rich capacity of the high-voltage station transformer for energy storage access according to the power plant equipment parameters;
constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
the method comprises the following steps of taking the actual operation condition of the high-voltage station-service transformer as a first standard for electrical safety check, and taking the calculated load of the high-voltage station-service transformer as a second standard for electrical safety check;
when the energy storage auxiliary frequency modulation project meets the first standard, the final energy storage type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit so as to pass the electrical safety check;
when the energy storage auxiliary frequency modulation project meets the second standard, if the energy storage capacity with the optimal economic benefit is smaller than or equal to the abundant capacity, the energy storage final type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit so as to pass the electrical safety check, and if the energy storage capacity with the optimal economic benefit is larger than the abundant capacity, the energy storage final type selection capacity is smaller than the abundant capacity so as to pass the electrical safety check.
With reference to the first aspect, in a first possible implementation manner of the first aspect, when the energy storage auxiliary frequency modulation item meets the first criterion, the energy storage final type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit, so as to pass an electrical safety check, specifically:
when the energy storage auxiliary frequency modulation project meets the first standard, judging whether the energy storage capacity with the optimal economic benefit is less than or equal to the surplus capacity;
if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, taking the energy storage capacity with the optimal economic benefit as the initial energy storage type selection capacity to perform electrical safety check;
when the checking is passed, the final model selection capacity of the stored energy is equal to the energy storage capacity with the optimal economic benefit;
when the check is not passed, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass the electrical safety check, and determining the energy storage capacity when the check is passed as the final model selection capacity of the energy storage;
and if the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final model selection capacity of the energy storage.
With reference to the first aspect, in a second possible implementation manner of the first aspect, when the energy storage auxiliary frequency modulation project meets the second criterion, if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, the energy storage final type selection capacity is equal to or less than the energy storage capacity with the optimal economic benefit to pass through the electrical safety check, and if the energy storage capacity with the optimal economic benefit is greater than the abundant capacity, the energy storage final type selection capacity is less than the abundant capacity to pass through the electrical safety check, specifically:
when the energy storage auxiliary frequency modulation project meets the second standard, judging whether the energy storage capacity with the optimal economic benefit is less than or equal to the surplus capacity;
if the energy storage capacity with the optimal economic benefit is less than or equal to the surplus capacity, taking the energy storage capacity with the optimal economic benefit as energy storage primary model selection capacity to carry out electrical safety check;
when the check is passed, the final energy storage type selection capacity is equal to the energy storage capacity with the optimal economic benefit;
when the check is not passed, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass the electrical safety check, and determining the energy storage capacity when the check is passed as the final model selection capacity of the energy storage;
and if the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the surplus capacity to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final type selection capacity of the energy storage.
With reference to the first possible implementation manner and the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the electrical safety check specifically includes:
checking the design capacity of the high-voltage service transformer, and judging whether the design capacity of the high-voltage service transformer meets a first checking condition;
calculating the actual maximum load of the high-voltage service transformer, and judging whether the actual maximum load of the high-voltage service transformer meets a second check condition;
calculating the actual minimum load of the high-voltage service transformer, and judging whether the actual minimum load of the high-voltage service transformer meets a third checking condition;
calculating the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant, and judging whether the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant meets a fourth checking condition;
and when the first checking condition, the second checking condition, the third checking condition and the fourth checking condition are all satisfied, the electric safety checking is passed.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, a designed maximum load rate of the high-voltage service transformer after the high-voltage service transformer is accessed to the energy storage system is checked according to the initial model selection capacity of the energy storage, and if the designed maximum load rate of the high-voltage service transformer is less than or equal to 100%, the first checking condition is met;
on the basis of the actual operation maximum current value of the high-voltage service transformer, the actual operation maximum load rate of the high-voltage service transformer after the high-voltage service transformer is connected into the energy storage system is calculated according to the initial energy storage model selection capacity, and if the actual operation maximum load rate of the high-voltage service transformer is smaller than or equal to 100%, the second calibration condition is met;
on the basis of the minimum actual operating current value of the high-voltage service transformer, calculating the minimum actual operating load of the high-voltage service transformer after the high-voltage service transformer is connected to the energy storage system according to the initial energy storage type selection capacity, and if the minimum actual operating load of the high-voltage service transformer is greater than or equal to the initial energy storage type selection capacity, meeting the third checking condition;
and checking the maximum possible short-circuit current passing through the low-voltage side bus of the high-voltage station transformer according to the initial energy storage type selection capacity, and if the maximum possible short-circuit current of the low-voltage side bus of the high-voltage station transformer is smaller than the rated short-circuit on-off current of station system equipment, meeting the fourth checking condition.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on a simulation result of the power plant simulation model specifically includes:
according to the successful bid historical operation data of the actual operation data of the power plant, establishing a power plant simulation model based on the detailed rule of the regional frequency modulation auxiliary service of the energy storage auxiliary frequency modulation project;
and predicting the AGC (automatic gain control) regulation performance index of the joint frequency modulation by combining the power plant simulation model and a preset energy storage system model, and determining the energy storage capacity with the optimal economic benefit according to an economic benefit analysis result corresponding to the energy storage capacity.
With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the power plant equipment parameters include a high-voltage station transformer design capacity, a high-voltage side rated current, a low-voltage side rated current, a connection group, an impedance, a voltage transformation ratio, and a rated short-circuit breaking current of station service electric system equipment; the actual operation data of the power plant comprises the historical operation data of winning a bid, the actual operation maximum current value of the high-voltage station transformer and the actual operation minimum current value of the high-voltage station transformer.
In a second aspect, an embodiment of the present invention provides an energy storage constant volume device suitable for auxiliary frequency modulation of energy storage in a power plant, including:
the acquisition module is used for acquiring equipment parameters of the power plant and actual operation data of the power plant;
the first calculation module is used for calculating the abundant capacity of the high-voltage station transformer for energy storage access according to the power plant equipment parameters;
the second calculation module is used for constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
the checking standard determining module is used for taking the actual running condition of the high-voltage station transformer as a first standard of electrical safety checking, and taking the calculated load of the high-voltage station transformer as a second standard of the electrical safety checking;
the first capacity determining module is used for enabling the final type selection capacity of the stored energy to be equal to or smaller than the energy storage capacity with the optimal economic benefit when the energy storage auxiliary frequency modulation project meets the first standard so as to pass the electrical safety check;
and the second capacity determination module is used for enabling the energy storage final type selection capacity to be equal to or smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage auxiliary frequency modulation project meets the second standard and enabling the energy storage final type selection capacity to be smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage capacity with the optimal economic benefit is smaller than the surplus capacity.
In a third aspect, an embodiment of the present invention provides an energy storage capacity fixing device suitable for power plant energy storage auxiliary frequency modulation, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the energy storage capacity fixing device implements the energy storage capacity fixing method described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
1. a power plant simulation model is constructed according to actual operation data of a power plant, energy storage capacity is optimized based on simulation results, differentiation of unit performance among the power plants is fully considered, and accuracy is high.
2. Aiming at different constant volume standards of the energy storage system, different constant volume calculation processes are adopted, and the method is more scientific and reasonable.
3. The method has the advantages that safe operation of the power plant is guaranteed as a first element, the phenomenon that active power is transferred to the high-voltage side of the power plant when the power plant is charged and the power plant is not overloaded when the power plant is discharged is guaranteed, and meanwhile, the economic benefit is optimal.
4. The theoretical performance, the scientificity and the accuracy of the energy storage system constant volume method are improved, and therefore the reasonability of the capacity configuration of the energy storage system is improved.
5. The method improves the applicability of the energy storage system capacity selection method in the energy storage auxiliary frequency modulation project, and is suitable for various power plant types such as coal-fired power plants, gas-steam combined cycle power plants and the like.
6. The method provides scientific and reasonable basis for the constant volume research of the energy storage auxiliary frequency modulation project suitable for the external service bus access scheme.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic flow chart of an energy storage capacity fixing method suitable for power plant energy storage auxiliary frequency modulation in an embodiment of the invention;
FIG. 2 is a flow chart of the energy storage system capacity fixing standard of the energy storage capacity fixing method suitable for the power plant energy storage auxiliary frequency modulation in the embodiment of the invention;
fig. 3 is a flow chart of the energy storage system constant volume standard of the energy storage constant volume method suitable for the power plant energy storage auxiliary frequency modulation in the embodiment of the present invention;
fig. 4 is a flowchart of electrical safety check of the energy storage capacity fixing method suitable for the power plant energy storage auxiliary frequency modulation in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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 first embodiment of the present invention:
referring to fig. 1, a first embodiment of the present invention provides an energy storage capacity fixing method suitable for auxiliary frequency modulation of energy storage in a power plant, which at least includes the following steps:
s1, acquiring equipment parameters of a power plant and actual operation data of the power plant;
the power plant equipment parameters comprise the design capacity of the high-voltage station transformer, the high-voltage side rated current, the low-voltage side rated current, the wiring group, impedance, voltage transformation ratio, the rated short circuit on-off current of station system equipment and the like; the actual operation data of the power plant comprises the historical operation data of winning a bid, the maximum actual operation current value of the high-voltage station transformer, the minimum actual operation current value of the high-voltage station transformer and the like.
S2, calculating to obtain the rich capacity of the high-voltage station transformer for accessing the stored energy according to the power plant equipment parameters; in this embodiment, the rich capacity a that the high-voltage service transformer can be accessed to for storing energy is calculated according to the design capacity and the design load of the high-voltage service transformer.
S3, constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
in this embodiment, a power plant simulation model is constructed according to the bid-winning historical operating data of the actual operating data of the power plant and based on the detailed rule of the frequency modulation auxiliary service of the region where the energy storage auxiliary frequency modulation project is located;
and predicting the AGC (automatic gain control) regulation performance index of the combined frequency modulation by combining the power plant simulation model and a preset energy storage system model, and determining the energy storage capacity B with the optimal economic benefit according to an economic benefit analysis result corresponding to the energy storage capacity.
S4, taking the actual running condition of the high-voltage station transformer as a first standard for electrical safety check, and taking the calculated load of the high-voltage station transformer as a second standard for electrical safety check;
because the actual operation load of the high-rise transformer is smaller than the calculation load, the standard of the constant volume of the energy storage system is divided into two types:
the first method is to meet the actual operation requirement, namely to use the actual operation condition of the high-rise transformer as the standard of electrical safety check;
the second is to meet the theoretical design requirements, i.e., to use the high plant-variable calculation load as the standard for electrical safety check.
S5, when the energy storage auxiliary frequency modulation project meets the first standard, the final energy storage type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit, and the electric safety check is carried out;
in this embodiment, when the energy storage auxiliary frequency modulation project meets the first criterion, it is determined whether the energy storage capacity with the optimal economic benefit is less than or equal to the rich capacity, as shown in fig. 2;
(1) Let n =0,m =0;
(2) If the energy storage capacity with the optimal economic benefit is smaller than or equal to the surplus capacity, taking the energy storage capacity with the optimal economic benefit as energy storage preliminary type selection capacity to check the electrical safety, namely B is smaller than or equal to A, and then carrying out electrical safety check with the energy storage preliminary type selection capacity C = B;
1) When the check is passed, the final energy storage model selection capacity is equal to the energy storage capacity with the optimal economic benefit, and the final energy storage model selection capacity P = B;
2) When the energy storage capacity value of the energy storage capacity with the optimal economic benefit is gradually reduced to pass the electric safety check when the check does not pass, the energy storage capacity value passing the check is determined as the final type selection capacity of the energy storage, namely L is used as a step length, the energy storage capacity value is gradually reduced from B, namely the initial type selection capacity of the energy storage is enabled to be C = B-n × L (n =1,2 \8230; the electric safety check is sequentially carried out until the check passes, and the final type selection capacity of the energy storage is enabled to be P = C = B-n × L;
wherein, the aim of the step is to ensure that the stored energy discharge energy is consumed by the service power because A determined by the surplus capacity of the high-rise plant is checked and calculated and B is less than or equal to C and less than or equal to A.
(3) If the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final type selection capacity of the energy storage, namely if B > A, and taking L as a step length, starting from B, gradually reducing the energy storage capacity value, namely when the initial type selection capacity of the energy storage is C = B-m × L (m =0,1,2 \ 8230), sequentially carrying out electrical safety check until the check passes, and then sequentially carrying out the final type selection capacity of the energy storage P = C = B-m × L;
wherein the purpose lies in: under the condition of ensuring the actual operation, the high-rise station becomes not overloaded when the energy storage is charged, and meanwhile, the energy storage and discharge energy is ensured to be consumed by the station service.
And S6, when the energy storage auxiliary frequency modulation project meets the second standard, if the energy storage capacity with the optimal economic benefit is smaller than or equal to the surplus capacity, the final energy storage type selection capacity is made to be equal to or smaller than the energy storage capacity with the optimal economic benefit to pass through electrical safety check, and if the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, the final energy storage type selection capacity is made to be smaller than the surplus capacity to pass through electrical safety check.
In this embodiment, when the energy storage auxiliary frequency modulation project meets the second criterion, it is determined whether the energy storage capacity with the optimal economic benefit is less than or equal to the rich capacity, as shown in fig. 3;
(1) Let n =0,m =0;
(2) If the energy storage capacity with the optimal economic benefit is smaller than or equal to the surplus capacity, taking the energy storage capacity with the optimal economic benefit as an energy storage preliminary type selection capacity to perform electrical safety check, namely B is smaller than or equal to A, and performing electrical safety check with energy storage preliminary type selection capacity C = B;
1) When the checking is passed, the final energy storage type selection capacity is equal to the energy storage capacity with the optimal economic benefit, and the final energy storage type selection capacity P = B;
2) When the check is not passed, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass the electrical safety check, and determining the energy storage capacity when the check is passed as the final model selection capacity of the energy storage; namely, taking L as a step length, starting from B, gradually reducing the energy storage capacity value, namely, enabling the energy storage initial type selection capacity C = B-n × L (n =1,2 \8230; and sequentially checking the electrical safety until the checking is passed, and finally enabling the energy storage type selection capacity P = C = B-n × L;
wherein, the aim of the step is to ensure that the stored energy discharge energy is consumed by the service power because A determined by the surplus capacity of the high-rise plant is checked and calculated and B is less than or equal to C and less than or equal to A.
(3) If the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the surplus capacity to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final type selection capacity of the energy storage, namely if B > A, and taking L as a step length, and gradually reducing the energy storage capacity value from A, namely when the initial type selection capacity of the energy storage is C = A-m multiplied by L (m =0,1,2 \ 8230), sequentially carrying out electrical safety check until the check passes, and then sequentially carrying out the final type selection capacity of the energy storage P = C = A-m multiplied by L;
the method comprises the following steps of obtaining a storage capacity of a high-rise factory, and calculating the surplus capacity of the high-rise factory, wherein the storage capacity is determined by A, and C is more than or equal to A and less than B.
In the embodiment, the energy storage constant volume method can ensure that a high-voltage plant becomes not overloaded during energy storage charging and active power is not transferred to the high-voltage side of the high-voltage plant during energy storage discharging, and simultaneously, the optimal economic benefit is achieved.
In this embodiment, the electrical safety check is divided into four sub-modules for checking, and with reference to fig. 4, when the first check condition, the second check condition, the third check condition, and the fourth check condition are all satisfied, the electrical safety check is passed, specifically:
1. checking the design capacity of the high-voltage service transformer, and judging whether the design capacity of the high-voltage service transformer meets a first checking condition;
and checking the designed maximum load rate X of the high-voltage service transformer after the high-voltage service transformer is accessed to the energy storage system according to the initial energy storage type selection capacity C, and if the designed maximum load rate X of the high-voltage service transformer is less than or equal to 100% and X is less than or equal to 100%, meeting the first checking condition.
2. Calculating the actual maximum load of the high-voltage service transformer, and judging whether the actual maximum load of the high-voltage service transformer meets a second check condition;
and on the basis of the actual operation maximum current value of the high-voltage service transformer, calculating the actual operation maximum load rate Y of the high-voltage service transformer after the high-voltage service transformer is accessed to the energy storage system according to the initial energy storage type selection capacity C, and if the actual operation maximum load rate Y of the high-voltage service transformer is less than or equal to 100 percent and Y is less than or equal to 100 percent, satisfying the second check condition.
3. Checking the actual minimum load of the high-voltage service transformer, and judging whether the actual minimum load of the high-voltage service transformer meets a third checking condition;
and on the basis of the minimum actual operation current value of the high-voltage plant transformer, calculating the minimum actual operation load Z of the high-voltage plant transformer after the high-voltage plant transformer is accessed to the energy storage system according to the initial energy storage type selection capacity C, and if the minimum actual operation load Z of the high-voltage plant transformer is greater than or equal to the initial energy storage type selection capacity C and C is less than or equal to Z, satisfying the third checking condition.
4. Calculating the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant, and judging whether the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant meets a fourth checking condition;
and checking the maximum possible short-circuit current I passing through the low-voltage side bus of the high-voltage station transformer according to the energy storage initial selection capacity C, and if the maximum possible short-circuit current I of the low-voltage side bus of the high-voltage station transformer is smaller than the rated short-circuit on-off current Ie of the station system equipment, and I < Ie, meeting the fourth checking condition.
Compared with the prior art, the first embodiment of the invention has the following beneficial effects:
1. a power plant simulation model is constructed according to actual operation data of a power plant, energy storage capacity is optimized based on simulation results, differentiation of unit performance among the power plants is fully considered, and accuracy is high.
2. Aiming at different energy storage system constant volume standards, different constant volume calculation processes are adopted, and the method is more scientific and reasonable.
3. The method has the advantages that safe operation of the power plant is guaranteed as a first element, the phenomenon that active power is transferred to the high-voltage side of the power plant when the power plant is charged and the power plant is not overloaded when the power plant is discharged is guaranteed, and meanwhile, the economic benefit is optimal.
4. The theoretical performance, the scientificity and the accuracy of the energy storage system constant volume method are improved, and therefore the reasonability of the energy storage system capacity configuration is improved.
5. The applicability of the energy storage system capacity selection method in the energy storage auxiliary frequency modulation project is improved, and the method is suitable for various power plant types such as coal-fired power plants, gas-steam combined cycle power plants and the like.
6. The method provides scientific and reasonable basis for the constant volume research of the energy storage auxiliary frequency modulation project suitable for the external service bus access scheme.
Second embodiment of the invention:
a second embodiment of the present invention provides an energy storage constant volume device suitable for energy storage auxiliary frequency modulation in a power plant, including:
the acquisition module is used for acquiring power plant equipment parameters and power plant actual operation data;
the first calculation module is used for calculating the abundant capacity of the high-voltage station transformer for energy storage access according to the power plant equipment parameters;
the second calculation module is used for constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
the checking standard determining module is used for taking the actual running condition of the high-voltage station transformer as a first standard of electrical safety checking, and taking the calculated load of the high-voltage station transformer as a second standard of the electrical safety checking;
the first capacity determining module is used for enabling the final energy storage type selection capacity to be equal to or smaller than the energy storage capacity with the optimal economic benefit when the auxiliary energy storage frequency modulation project meets the first standard so as to pass the electrical safety check;
and the second capacity determination module is used for enabling the energy storage final type selection capacity to be equal to or smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage auxiliary frequency modulation project meets the second standard and enabling the energy storage final type selection capacity to be smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage capacity with the optimal economic benefit is smaller than the surplus capacity.
The third embodiment of the present invention:
the third embodiment of the invention also provides an energy storage capacity fixing device, which comprises a processor, a memory and a computer program, such as an object fixing program, stored in the memory and configured to be executed by the processor. The processor, when executing the computer program, implements the steps of the energy storage and volume fixing method, such as step S1 shown in fig. 1. Alternatively, the processor implements the functions of the modules/units in the above device embodiments when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units, stored in the memory and executed by the processor, to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used for describing the execution process of the computer program in the energy storage capacity device.
The energy storage constant volume equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer and an intelligent tablet. The energy storage capacity fixing device can comprise, but is not limited to, a processor and a memory. It will be understood by those skilled in the art that the above components are merely examples of the running simulation device, and do not constitute a limitation to the running simulation device, and may include more or less components than the above components, or combine some components, or different components, for example, the energy storage capacity device may further include an input/output device, a network access device, a bus, and the like.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general processor can be a microprocessor or the processor can be any conventional processor and the like, the processor is a control center for running the simulation device, and various interfaces and lines are utilized to connect various parts of the whole energy storage capacity fixing device.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the operation simulation apparatus by executing or executing the computer programs and/or modules stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The module/unit integrated with the energy storage and capacity metering device can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U.S. disk, removable hard disk, magnetic diskette, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signal, telecommunications signal, and software distribution medium, etc. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. 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, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An energy storage constant volume method suitable for auxiliary frequency modulation of power plant energy storage is characterized by at least comprising the following steps:
acquiring power plant equipment parameters and power plant actual operation data;
calculating to obtain the rich capacity of the high-voltage station transformer for energy storage access according to the power plant equipment parameters;
constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
the method comprises the following steps of taking the actual operation condition of the high-voltage station-service transformer as a first standard for electrical safety check, and taking the calculated load of the high-voltage station-service transformer as a second standard for electrical safety check;
when the energy storage auxiliary frequency modulation project meets the first standard, the final energy storage type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit so as to pass the electrical safety check;
when the energy storage auxiliary frequency modulation project meets the second standard, if the energy storage capacity with the optimal economic benefit is smaller than or equal to the abundant capacity, the energy storage final type selection capacity is equal to or smaller than the energy storage capacity with the optimal economic benefit so as to pass the electrical safety check, and if the energy storage capacity with the optimal economic benefit is larger than the abundant capacity, the energy storage final type selection capacity is smaller than the abundant capacity so as to pass the electrical safety check.
2. An energy storage capacity fixing method suitable for an energy storage auxiliary frequency modulation of a power plant as claimed in claim 1, wherein when the energy storage auxiliary frequency modulation project meets the first standard, the final energy storage selection capacity is equal to or less than the energy storage capacity with the optimal economic benefit so as to pass the electrical safety check, specifically:
when the energy storage auxiliary frequency modulation project meets the first standard, judging whether the energy storage capacity with the optimal economic benefit is less than or equal to the surplus capacity;
if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, taking the energy storage capacity with the optimal economic benefit as the initial energy storage type selection capacity to perform electrical safety check;
when the checking is passed, the final model selection capacity of the stored energy is equal to the energy storage capacity with the optimal economic benefit;
when the check is not passed, the energy storage capacity value of the energy storage capacity with the optimal economic benefit is gradually reduced to pass the electrical safety check, and the energy storage capacity when the check is passed is determined as the final model selection capacity of the energy storage;
and if the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final model selection capacity of the energy storage.
3. An energy storage capacity fixing method suitable for an energy storage auxiliary frequency modulation of a power plant as claimed in claim 1, wherein when the energy storage auxiliary frequency modulation project meets the second standard, if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, the energy storage final type selection capacity is equal to or less than the energy storage capacity with the optimal economic benefit so as to pass through electrical safety check, and if the energy storage capacity with the optimal economic benefit is greater than the abundant capacity, the energy storage final type selection capacity is less than the abundant capacity so as to pass through electrical safety check, specifically:
when the energy storage auxiliary frequency modulation project meets the second standard, judging whether the energy storage capacity with the optimal economic benefit is less than or equal to the surplus capacity;
if the energy storage capacity with the optimal economic benefit is less than or equal to the abundant capacity, taking the energy storage capacity with the optimal economic benefit as the initial energy storage type selection capacity to perform electrical safety check;
when the checking is passed, the final model selection capacity of the stored energy is equal to the energy storage capacity with the optimal economic benefit;
when the check is not passed, gradually reducing the energy storage capacity value of the energy storage capacity with the optimal economic benefit to pass the electrical safety check, and determining the energy storage capacity when the check is passed as the final model selection capacity of the energy storage;
and if the energy storage capacity with the optimal economic benefit is larger than the surplus capacity, gradually reducing the energy storage capacity value of the surplus capacity to pass through electrical safety check, and determining the energy storage capacity when the energy storage capacity passes through as the final type selection capacity of the energy storage.
4. An energy storage constant volume method suitable for auxiliary frequency modulation of energy storage of a power plant as claimed in claim 2 or 3, wherein the electrical safety check is specifically:
checking the design capacity of the high-voltage service transformer, and judging whether the design capacity of the high-voltage service transformer meets a first checking condition;
checking the actual maximum load of the high-voltage service transformer, and judging whether the actual maximum load of the high-voltage service transformer meets a second checking condition;
calculating the actual minimum load of the high-voltage service transformer, and judging whether the actual minimum load of the high-voltage service transformer meets a third checking condition;
calculating the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant, and judging whether the short-circuit current of the energy storage system after the energy storage system is connected to the existing system of the power plant meets a fourth checking condition;
and when the first checking condition, the second checking condition, the third checking condition and the fourth checking condition are all satisfied, the electric safety checking is passed.
5. The method of claim 4, wherein the energy storage volume fixing method is applied to the auxiliary frequency modulation of the power plant energy storage,
calculating the designed maximum load rate of the high-voltage service transformer after the high-voltage service transformer is accessed to the energy storage system according to the initial energy storage type selection capacity, and if the designed maximum load rate of the high-voltage service transformer is less than or equal to 100%, meeting the first checking condition;
on the basis of the actual operation maximum current value of the high-voltage service transformer, calculating the actual operation maximum load rate of the high-voltage service transformer after the high-voltage service transformer is connected to the energy storage system according to the initial energy storage type selection capacity, and if the actual operation maximum load rate of the high-voltage service transformer is smaller than or equal to 100%, meeting the second checking condition;
on the basis of the minimum actual operating current value of the high-voltage service transformer, calculating the minimum actual operating load of the high-voltage service transformer after the high-voltage service transformer is connected to the energy storage system according to the initial energy storage type selection capacity, and if the minimum actual operating load of the high-voltage service transformer is greater than or equal to the initial energy storage type selection capacity, meeting the third checking condition;
and checking the maximum possible short-circuit current passing through the low-voltage side bus of the high-voltage station transformer according to the energy storage initial selection type capacity, and if the maximum possible short-circuit current of the low-voltage side bus of the high-voltage station transformer is smaller than the rated short-circuit on-off current of the station system equipment, meeting the fourth checking condition.
6. An energy storage capacity fixing method suitable for auxiliary frequency modulation of power plant energy storage according to claim 1, wherein the building of a power plant simulation model according to the actual operation data of the power plant and the determination of the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model specifically comprise:
according to the historical bid winning operation data of the actual operation data of the power plant, establishing a power plant simulation model based on the detailed rule of the regional frequency modulation auxiliary service of the energy storage auxiliary frequency modulation project;
and predicting the AGC (automatic gain control) regulation performance index of the joint frequency modulation by combining the power plant simulation model and a preset energy storage system model, and determining the energy storage capacity with the optimal economic benefit according to an economic benefit analysis result corresponding to the energy storage capacity.
7. An energy storage capacity fixing method suitable for the auxiliary frequency modulation of the energy storage of the power plant as claimed in claim 1, wherein the power plant equipment parameters comprise the design capacity of the high-voltage service transformer, the rated current of the high-voltage side, the rated current of the low-voltage side, the wiring group, the impedance, the voltage transformation ratio, and the rated short circuit break current of the service power system equipment; the actual operation data of the power plant comprises the historical operation data of winning a bid, the actual operation maximum current value of the high-voltage station transformer and the actual operation minimum current value of the high-voltage station transformer.
8. The utility model provides an energy storage constant volume device suitable for power plant's energy storage auxiliary frequency modulation which characterized in that includes:
the acquisition module is used for acquiring equipment parameters of the power plant and actual operation data of the power plant;
the first calculation module is used for calculating the abundant capacity of the high-voltage station transformer for energy storage access according to the power plant equipment parameters;
the second calculation module is used for constructing a power plant simulation model according to the actual operation data of the power plant and determining the energy storage capacity with the optimal economic benefit based on the simulation result of the power plant simulation model;
the checking standard determining module is used for taking the actual running condition of the high-voltage station transformer as a first standard of electrical safety checking, and taking the calculated load of the high-voltage station transformer as a second standard of the electrical safety checking;
the first capacity determining module is used for enabling the final type selection capacity of the stored energy to be equal to or smaller than the energy storage capacity with the optimal economic benefit when the energy storage auxiliary frequency modulation project meets the first standard so as to pass the electrical safety check;
and the second capacity determining module is used for enabling the energy storage final type selection capacity to be equal to or smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage auxiliary frequency modulation project meets the second standard and enabling the energy storage final type selection capacity to be smaller than the energy storage capacity with the optimal economic benefit to pass the electrical safety check if the energy storage capacity with the optimal economic benefit is smaller than the abundant capacity.
9. An energy storage capacity device suitable for auxiliary frequency modulation of power plant energy storage, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the energy storage capacity method according to any one of claims 1 to 7.
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