CN116706951B - Substation energy storage capacity configuration method and system based on load characteristics - Google Patents
Substation energy storage capacity configuration method and system based on load characteristics Download PDFInfo
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Abstract
The invention discloses a transformer substation energy storage capacity configuration method based on load characteristics, which comprises the steps of obtaining historical data information of a target transformer substation; selecting a maximum load period and calculating a ratio of the load to greater than 80% of the maximum load; determining an energy storage operation working state of a target transformer substation; setting an objective function and corresponding constraint conditions of energy storage configuration and solving to obtain the energy storage configuration calculation capacity of the maximum load period; and determining the final energy storage configuration capacity of the transformer substation. The invention also discloses a system for realizing the transformer substation energy storage capacity configuration method based on the load characteristic. According to the invention, on the premise of considering the energy storage charging and discharging efficiency, the energy storage capacity configuration scheme is provided based on constraint conditions such as the energy storage charging and discharging electric quantity, the transformer substation load and the energy storage charging and discharging power, so that the configuration of the energy storage capacity of the transformer substation is realized, the balance of electric power and electric quantity in a power supply area can be met, the reliability of the power supply of the transformer substation is improved, and the reliability is high, the accuracy is good, and the method is objective and scientific.
Description
Technical Field
The invention belongs to the field of electrical automation, and particularly relates to a transformer substation energy storage capacity configuration method and system based on load characteristics.
Background
Along with the development of economic technology and the improvement of living standard of people, electric energy becomes an indispensable secondary energy source in the production and living of people, and brings endless convenience to the production and living of people. Therefore, ensuring stable and reliable supply of electric energy becomes one of the most important tasks of the electric power system.
At present, as a large number of new energy power generation systems are integrated into a power grid, the randomness, the volatility and the intermittence of the new energy power generation systems greatly change the load characteristics of the transformer substation in a new energy access area, so that the power system faces a great operation test. Meanwhile, along with the rapid development and application of energy storage technology, the energy storage system can flexibly store and release electric energy, and can carry out load peak clipping and valley filling, frequency modulation adjustment, new energy power generation fluctuation smoothing, demand side response and the like for the power system, so that the power supply reliability of the power system is greatly improved. Accordingly, power systems have begun to be widely used as energy storage devices.
At present, a relatively original configuration scheme is always adopted for the energy storage capacity configuration process of the transformer substation, namely, the energy storage capacity is configured according to a manual experience mode. However, the configuration of the energy storage capacity is performed by adopting a manual experience mode, so that the subjectivity is high, the reliability is poor, and the configuration of the energy storage equipment with larger capacity tends to be performed subjectively, so that the resource idling and waste of the energy storage device are further caused.
Disclosure of Invention
The invention aims to provide a transformer substation energy storage capacity configuration method based on load characteristics, which is high in reliability, good in accuracy and objective and scientific.
The second purpose of the invention is to provide a system for realizing the substation energy storage capacity configuration method based on the load characteristic.
The transformer substation energy storage capacity configuration method based on the load characteristic provided by the invention comprises the following steps:
S1, acquiring historical data information of a target transformer substation;
S2, selecting a maximum load period according to the data information obtained in the step S1, and calculating the ratio of the load of the target transformer substation in the maximum load period to 80% of the maximum load of the target transformer substation;
s3, determining the energy storage operation working state of the target transformer substation according to the ratio obtained in the step S2;
s4, setting an objective function and corresponding constraint conditions of energy storage configuration according to the energy storage operation working state determined in the step S3, and solving to obtain the energy storage configuration calculation capacity of the maximum load period;
S5, determining the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity obtained in the step S4, and completing the energy storage capacity configuration of the transformer substation based on the load characteristic.
The step S2 of selecting a maximum load period according to the data information acquired in the step S1, and calculating a ratio of the load of the target substation in the maximum load period to 80% of the maximum load of the target substation, wherein the method specifically comprises the following steps:
selecting the maximum load period of the target substation: the first maximum load period is 7-8 months, and the second maximum load period is 1 month and 12 months;
taking the set time as an interval, acquiring data points and load data information corresponding to the data points;
The ratio of the load of the target substation to 80% of the maximum load of the target substation is calculated by adopting the following formula in the first maximum load period and the second maximum load period respectively:
Wherein p 1 is a ratio of the load of the target substation to the 80% of the maximum load of the target substation in the first maximum load period; n A1 is the number of data points that the load data of the target transformer substation in the first maximum load period is greater than 80% of the maximum load of the target transformer substation; n total1 is the total number of data points of the target substation in the first maximum load period; p 2 is the ratio of the load of the target substation in the second maximum load period to be greater than 80% of the own maximum load; n A2 is the number of data points that the target substation load data in the second maximum load period is greater than 80% of the target substation maximum load; n total2 is the total number of data points of the target substation within the second maximum load period.
And step S3, determining the energy storage operation working state of the target transformer substation according to the ratio obtained in the step S2, and specifically comprising the following steps:
If the ratio of the load to 80% of the maximum load is greater than or equal to a set value, the energy storage operation working state of the transformer substation is determined to be a first state; the first state applies energy storage to the substation so that the substation load rate is maintained at a set level and the load peak is reduced in a first maximum load period and a second maximum load period;
if the ratio of the load to 80% of the maximum load is smaller than the set value, the energy storage operation working state of the transformer substation is determined to be a second state; the second state is to apply energy storage to the transformer substation, so that the transformer substation reduces the load peak value of the transformer substation in the first maximum load period and the second maximum load period, and the transformer substation is guaranteed not to have heavy load.
The step S4 is to set an objective function and a corresponding constraint condition of the energy storage configuration according to the energy storage operation state determined in the step S3, and solve the energy storage configuration calculation capacity of the maximum load period, and specifically includes the following steps:
respectively judging an energy storage operation working state of a target transformer substation in a first maximum load period and an energy storage operation working state of the target transformer substation in a second maximum load period;
if the energy storage operation working state of the transformer substation is the first state, the method comprises the following steps:
Maintaining the load factor beta as Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-βSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-βSsub,N)
Psub,load(t)≤Ssub,N
Wpeak≤tt·PESS,max
Wherein P ESS (t) is the energy storage power of the power supply area; p sub,load (t) is the network-down load power of the main transformer of the target transformer station; beta is the load rate of the transformer substation in the late peak load period maintained after energy storage is configured; s sub,N is the rated capacity of a main transformer of the target transformer substation; p ESS,max is the energy storage capacity value; w discharge is the discharge electric quantity in the peak load time; Δt is a set period of time; NN 1 is the charging time of the time period; NN 2 is the discharge time of the time period; alpha is energy storage efficiency; w peak is the amount of electricity which is absent in the maximum load period; tt is the full-power charge and discharge time of the energy storage;
if the energy storage operation working state of the transformer substation is the second state, the method comprises the following steps:
Maintaining the load factor beta as Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-δSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-δSsub,N)
Psub,load(t)≤Ssub,N
Wpeak≤tt·PESS,max
Delta is the load rate of the peak load time of the target substation;
And solving to obtain the energy storage configuration calculation capacity of the first maximum load period and the energy storage configuration calculation capacity of the second maximum load period according to the established model.
And step S5, determining the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity obtained in the step S4, and specifically comprising the following steps:
And (3) taking a larger value as the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity of the first maximum load period and the energy storage configuration calculation capacity of the second maximum load period obtained in the step (S4).
The invention also discloses a system for realizing the transformer substation energy storage capacity configuration method based on the load characteristic, which comprises a data acquisition module, a ratio calculation module, an operation state confirmation module, a capacity calculation module and an energy storage configuration module; the data acquisition module, the ratio calculation module, the running state confirmation module, the capacity calculation module and the energy storage configuration module are sequentially connected in series; the data acquisition module is used for acquiring historical data information of the target transformer substation and uploading the data to the ratio calculation module; the ratio calculation module is used for selecting a maximum load period according to the received data, calculating the ratio that the load of the target transformer substation in the maximum load period is greater than 80% of the maximum load of the target transformer substation, and uploading the data to the running state confirmation module; the operation state confirmation module is used for determining the energy storage operation state of the target transformer substation according to the received data and uploading the data to the capacity calculation module; the capacity calculation module is used for setting an objective function and corresponding constraint conditions of energy storage configuration according to the received data, solving the energy storage configuration calculation capacity of the maximum load period, and uploading the data to the energy storage configuration module; the energy storage configuration module is used for determining the final energy storage configuration capacity of the transformer substation according to the received data and completing the energy storage capacity configuration of the transformer substation based on the load characteristics.
According to the method and the system for configuring the energy storage capacity of the transformer substation based on the load characteristics of the transformer substation in the peak load period, the energy storage configuration strategy is divided into two scenes of maintaining the stability of the load rate of the transformer substation in the peak load period and peak load shifting of the load curve of the transformer substation, and the energy storage capacity configuration scheme is innovatively provided based on constraint conditions such as the energy storage charge and discharge capacity, the load of the transformer substation and the energy storage charge and discharge power on the premise of considering the energy storage charge and discharge efficiency, so that the configuration of the energy storage capacity of the transformer substation is realized, the balance of the electric power and the electric quantity in a power supply area can be met, the reliability of power supply of the transformer substation is improved, and the method and the system are high in reliability, good in accuracy and objective and scientific.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a load and a new energy curve of a power supply area of a transformer substation according to an embodiment of the method.
Fig. 3 is a schematic diagram of a transformer substation load curve after new energy treatment.
FIG. 4 is a schematic diagram of functional modules of the system of the present invention.
Detailed Description
A schematic process flow diagram of the method of the present invention is shown in fig. 1: the transformer substation energy storage capacity configuration method based on the load characteristic provided by the invention comprises the following steps:
S1, acquiring historical data information of a target transformer substation;
S2, selecting a maximum load period according to the data information obtained in the step S1, and calculating the ratio of the load of the target transformer substation in the maximum load period to 80% of the maximum load of the target transformer substation; the method specifically comprises the following steps:
selecting the maximum load period of the target substation: the first maximum load period is 7-8 months, and the second maximum load period is 1 month and 12 months;
taking the set time as an interval, acquiring data points and load data information corresponding to the data points;
The ratio of the target substation load to more than 80% of the own maximum load is calculated by the following formula in the first maximum load period and the second maximum load period respectively:
Wherein p 1 is a ratio of the target substation load to 80% of the own maximum load in the first maximum load period; n A1 is the number of data points that the load data of the target transformer substation in the first maximum load period is greater than 80% of the maximum load of the target transformer substation; n total1 is the total number of data points of the target substation in the first maximum load period; p 2 is the ratio of the target substation load to greater than 80% of the own maximum load during the second maximum load period; n A2 is the number of data points that the target substation load data in the second maximum load period is greater than 80% of the target substation maximum load; n total2 is the total number of data points of the target substation in the second maximum load period;
s3, determining the energy storage operation working state of the target transformer substation according to the ratio obtained in the step S2; the method specifically comprises the following steps:
If the ratio of the load to the maximum load is greater than or equal to a set value (preferably 0.5), the energy storage operation working state of the transformer substation is determined to be a first state; the first state applies energy storage to the transformer substation, so that the transformer substation load rate is maintained at a set stable level and the load peak value is reduced in a first maximum load period and a second maximum load period;
If the ratio of the load to the maximum load is greater than 80% of the self maximum load and is smaller than a set value (preferably 0.5), the energy storage operation working state of the transformer substation is determined to be a second state; the second state is to apply energy storage to the transformer substation, so that the transformer substation reduces the load peak value of the transformer substation in the first maximum load period and the second maximum load period, and the transformer substation is ensured not to have heavy load;
S4, setting an objective function and corresponding constraint conditions of energy storage configuration according to the energy storage operation working state determined in the step S3, and solving to obtain the energy storage configuration calculation capacity of the maximum load period; the method specifically comprises the following steps:
respectively judging an energy storage operation working state of a target transformer substation in a first maximum load period and an energy storage operation working state of the target transformer substation in a second maximum load period;
if the energy storage operation working state of the transformer substation is the first state, the method comprises the following steps:
Maintaining the load factor beta as Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-βSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-βSsub,N)
Psub,load(t)≤Ssub,N
Wpeak≤tt·PESS,max
Wherein P ESS (t) is the energy storage power of the power supply area; p sub,load (t) is the network-down load power of the main transformer of the target transformer station; beta is the load rate of the transformer substation in the late peak load period maintained after energy storage is configured; s sub,N is the rated capacity of a main transformer of the target transformer substation; p ESS,max is the energy storage capacity value; w discharge is the discharge electric quantity in the peak load time; Δt is a set period of time; NN 1 is the charging time of the time period; NN 2 is the discharge time of the time period; alpha is energy storage efficiency; w peak is the amount of electricity which is absent in the maximum load period; tt is the full-power charge and discharge time of the energy storage;
The first constraint condition represents energy storage power under the condition that the load factor of the transformer substation is beta in the late peak load period, and meanwhile, the transformer substation is ensured not to be reloaded after the energy storage power is increased; the second constraint condition represents the charge-discharge power constraint of the stored energy; the third constraint condition indicates that the maximum value of the charge and discharge of the energy storage is greater than or equal to the maximum value of the power difference between the load power of the transformer substation and the load level to be maintained in the late peak load period, so that the power balance constraint can be ensured; the fourth constraint condition represents the discharge capacity in the late peak load period; the fifth constraint condition indicates that the chargeable amount of the energy storage configuration is greater than or equal to the electric quantity requirement of the system at the moment of peak load; the sixth constraint condition indicates that the maximum off-grid load power of the transformer substation is smaller than or equal to the capacity of the main transformer of the transformer substation under the normal operation condition, namely the overload condition of the transformer substation does not occur; the seventh constraint condition indicates that the full-power charge and discharge time of the energy storage considers tt hours (according to the existing electrochemical energy storage running condition, tt can take a value of 2 or 4 or other), and the electric quantity is limited in the peak load period;
if the energy storage operation working state of the transformer substation is the second state, the method comprises the following steps:
Maintaining the load factor beta as Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-δSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-δSsub,N)
Psub,load(t)≤Ssub,N
Wpeak≤tt·PESS,max
Delta is the load rate of the peak load time of the target substation;
The first constraint condition represents energy storage power under the condition that the load factor of the transformer substation is delta in the late peak load period, and meanwhile, the transformer substation is ensured not to be reloaded after the energy storage power is increased; the second constraint condition represents the charge-discharge power constraint of the stored energy; the third constraint condition indicates that the maximum power of the energy storage charge and discharge is larger than or equal to the maximum value of peak load period peak regulation power required when no heavy load occurs in the transformer substation, so that when the maximum load rate occurs in the transformer substation, the condition that no heavy load occurs in the transformer substation can be ensured through energy storage configuration; the fourth constraint condition represents the electric quantity released by the energy storage when the peak clipping and valley filling are carried out on the transformer substation load through the configuration of the energy storage; the fifth constraint condition indicates that the chargeable amount of the energy storage configuration is greater than or equal to the electric quantity requirement of the system at the moment of peak load; the sixth constraint condition indicates that the maximum off-grid load power of the transformer substation is smaller than or equal to the capacity of the main transformer of the transformer substation under the normal operation condition, namely the overload condition of the transformer substation does not occur; the seventh constraint condition indicates that the full-power charge and discharge time of the energy storage considers tt hours (according to the existing electrochemical energy storage running condition, tt can take a value of 2 or 4 or other), and the electric quantity is limited in the peak load period;
According to the established model, solving to obtain the first maximum load period energy storage configuration calculation capacity and the second maximum load period energy storage configuration calculation capacity;
s5, determining the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity obtained in the step S4, and completing the energy storage capacity configuration of the transformer substation based on the load characteristic; the method specifically comprises the following steps:
And (3) taking a larger value as the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity of the first maximum load period and the energy storage configuration calculation capacity of the second maximum load period obtained in the step (S4).
The method of the invention is further illustrated by the following set of examples:
Taking a certain power grid substation as an example, analyzing the energy storage capacity configuration of the substation according to actual operation data of the substation. Firstly, the operation data of the transformer substation on the day when the maximum load appears in summer and winter are selected, so that the maximum load of the transformer substation on the day and the transformer substation load rate can be obtained. And then, analyzing the operation data of 7-8 months and 12-1 month, and judging the load characteristic type of the transformer substation when the maximum load appears in summer and winter. The selected transformer station has 2 main transformers, and the rated capacity of a single transformer is 180MVA, so the total rated capacity of the transformer station is 360MVA, and the load of the transformer station is 288MW when the transformer station is heavy-loaded (namely, the load rate is 80%).
According to actual operation data analysis, the maximum load of the transformer substation in the typical load day of the transformer substation is 299.3MW at 7-11 points at night in the peak load period of 7-8 months in summer. The data point ratio of the peak load time load of 7-8 months which is greater than 80 percent (239.4 MW) of the maximum load is 0.73 and is greater than 0.5. Therefore, the load characteristic of the transformer substation belongs to a first state, namely the overall load rate of the transformer substation off-grid load is larger in the peak load period, and the transformer substation load rate in the peak load period is required to be maintained at a relatively stable level by configuring energy storage.
The curve of the substation under a typical load day in winter is shown in fig. 2. In fig. 2, under the condition of not considering configuration energy storage, the load curve of the transformer substation can be obtained through the difference value between the load curve of the power supply area of the transformer substation and the new energy output curve, as shown in fig. 2;
through calculation and analysis, the maximum load of the transformer substation is 299.3MW, the load value of 80% of the transformer substation is 239.4MW, and the load rate is 66.5%. Thus:
According to an actual load curve, the energy storage charging is utilized to play a role in filling the valley of the load characteristic of the transformer substation in a valley load period, and the full-power charging and discharging time of the energy storage is taken to be 4 hours. The method is characterized in that the load rate beta of the rated maximum load of the transformer substation is taken as constraint, the chargeable electric quantity in the valley load period is 320MWh, the energy storage charging and discharging efficiency is 80%, the electric quantity required in the peak load period is 160MWh, and the energy storage maximum discharging power required in the peak load period is 36MW.
Considering the constraint condition W peak≤t·PESS,max between the discharge electric quantity and full-power charge and discharge, the energy storage capacity of the transformer substation is at least configured to be P ESS,summer =40 MW in summer, so that the purpose of stabilizing the load characteristic of the transformer substation can be achieved, meanwhile, the electric power and electric quantity balance constraint of a peak load period can be also achieved, and the transformer substation is free from heavy load.
According to actual operation data analysis, 7 to 11 points at night in a peak load period of 12 to 1 month in winter, the maximum load of the transformer substation in a typical load day is 321.27MW, and a short-time overload condition exists. The data point duty ratio of the peak load time period of 12-1 month, in which the load is greater than 80 percent of the maximum load (257 MW) is about 0.45 and less than 0.5, so that the load characteristic of the transformer substation belongs to a second state, namely, the load rate is greater only in a short time period when the transformer substation is off-grid and the peak load time period is again, the peak load regulation effect is achieved by configuring energy storage, and the transformer substation is free from heavy load. After the new energy output of the power supply area of the transformer substation is considered, a load characteristic curve of the transformer substation under a typical load day in winter is shown in fig. 3;
therefore, after energy storage is configured, the condition that the load of the transformer substation does not have heavy load in the peak load period needs to be met, namely the load does not exceed 288MW. From the analysis, it is known that:
δ≤80％
Considering a certain load fluctuation, the value of δ is δ=75%. According to an actual load curve, the energy storage is utilized to charge in a valley load period, then the energy storage is discharged in a peak load period to play a role in peak clipping on the load characteristic of the transformer substation, and the full-power charging and discharging time of the energy storage is 4 hours. And the chargeable amount in the valley load period is 1228MWh, and the electric quantity required by discharging in the peak load period is 99.4MWh by taking the load rate delta of the rated maximum load of the transformer substation as a constraint. Considering that the energy storage charging and discharging efficiency is 80%, the charging electric quantity is 124.3MWh, and the maximum energy storage discharging power required by the peak load period is 52MW.
Considering the constraint condition between the discharge electric quantity and full-power charge and discharge, the transformer substation is configured with the energy storage of P ESS,winter =52 MW in winter, so that the condition that the transformer substation does not have heavy load in the peak load period can be met, and meanwhile, the power and electric quantity balance constraint in the peak load period can also be met.
Therefore, the energy storage capacity configured by integrating the load characteristics of the transformer substation in summer and winter can be known, and when the transformer substation is configured with the power of P ESS,N =52 MW for energy storage and the maximum power charge-discharge time is 4 hours, the transformer substation can realize the effect that the load characteristic curve of the transformer substation is stabilized in summer and the load characteristic curve of the transformer substation is subjected to peak clipping in winter. If the power supply area of the transformer substation is configured with a certain amount of energy storage due to new energy access, the energy storage capacity does not need to be increased in the future planning if the requirement of the transformer substation on the energy storage capacity can be met. If the energy storage capacity in the power supply area of the transformer substation cannot meet the requirement, the capacity of the energy storage configuration is increased in the power supply area in priority in the follow-up planning.
FIG. 4 is a schematic diagram of functional modules of the system of the present invention: the system for realizing the transformer substation energy storage capacity configuration method based on the load characteristic comprises a data acquisition module, a ratio calculation module, an operation state confirmation module, a capacity calculation module and an energy storage configuration module; the data acquisition module, the ratio calculation module, the running state confirmation module, the capacity calculation module and the energy storage configuration module are sequentially connected in series; the data acquisition module is used for acquiring historical data information of the target transformer substation and uploading the data to the ratio calculation module; the ratio calculation module is used for selecting a maximum load period according to the received data, calculating the ratio that the load of the target transformer substation in the maximum load period is greater than 80% of the maximum load of the target transformer substation, and uploading the data to the running state confirmation module; the operation state confirmation module is used for determining the energy storage operation state of the target transformer substation according to the received data and uploading the data to the capacity calculation module; the capacity calculation module is used for setting an objective function and corresponding constraint conditions of energy storage configuration according to the received data, solving the energy storage configuration calculation capacity of the maximum load period, and uploading the data to the energy storage configuration module; the energy storage configuration module is used for determining the final energy storage configuration capacity of the transformer substation according to the received data and completing the energy storage capacity configuration of the transformer substation based on the load characteristics.
Claims (5)
1. A transformer substation energy storage capacity configuration method based on load characteristics comprises the following steps:
S1, acquiring historical data information of a target transformer substation;
S2, selecting a maximum load period according to the data information obtained in the step S1, and calculating the ratio of the load of the target transformer substation in the maximum load period to 80% of the maximum load of the target transformer substation;
s3, determining the energy storage operation working state of the target transformer substation according to the ratio obtained in the step S2;
S4, setting an objective function and corresponding constraint conditions of energy storage configuration according to the energy storage operation working state determined in the step S3, and solving to obtain the energy storage configuration calculation capacity of the maximum load period; the method specifically comprises the following steps:
respectively judging an energy storage operation working state of a target transformer substation in a first maximum load period and an energy storage operation working state of the target transformer substation in a second maximum load period;
if the energy storage operation working state of the transformer substation is the first state, the method comprises the following steps:
maintaining load factor Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-βSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-βSsub,N)
Psub,load(t)≤Ssub,N
Wpeak≤tt·PESS,max
Wherein P ESS (t) is the energy storage power of the power supply area; p sub,load (t) is the network-down load power of the main transformer of the target transformer station; beta is the load rate of the transformer substation in the late peak load period maintained after energy storage is configured; s sub,N is the rated capacity of a main transformer of the target transformer substation; p ESS,max is the energy storage capacity value; w discharge is the discharge electric quantity in the peak load time; Δt is a set period of time; NN 1 is the charging time of the time period; NN 2 is the discharge time of the time period; alpha is energy storage efficiency; w peak is the amount of electricity which is absent in the maximum load period; tt is the full-power charge and discharge time of the energy storage;
if the energy storage operation working state of the transformer substation is the second state, the method comprises the following steps:
Maintaining the load factor beta as Wherein beta 1 is the load factor level to be maintained calculated from 80% of the maximum load of the substation, and/>P sub,load,max is the maximum load value of the target substation, and S sub,N is the rated capacity of the main transformer of the target substation;
constraints that the energy storage configuration needs to satisfy include:
PESS(t)＝Psub,load(t)-δSsub,N
-PESS,max≤PESS(t)≤PESS,max
PESS,max≥max(Psub,load(t)-δSsub,N)
Delta is the load rate of the peak load time of the target substation;
According to the established model, solving to obtain the first maximum load period energy storage configuration calculation capacity and the second maximum load period energy storage configuration calculation capacity;
S5, determining the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity obtained in the step S4, and completing the energy storage capacity configuration of the transformer substation based on the load characteristic.
2. The method for configuring energy storage capacity of a transformer substation based on load characteristics according to claim 1, wherein the data information obtained in step S1 in step S2 is used for selecting a maximum load period and calculating a ratio of the load of the target transformer substation in the maximum load period to 80% of the maximum load of the target transformer substation, and specifically comprises the following steps:
selecting the maximum load period of the target substation: the first maximum load period is 7-8 months, and the second maximum load period is 1 month and 12 months;
taking the set time as an interval, acquiring data points and load data information corresponding to the data points;
The ratio of the load of the target substation to 80% of the maximum load of the target substation is calculated by adopting the following formula in the first maximum load period and the second maximum load period respectively:
Wherein p 1 is a ratio of the load of the target substation to the 80% of the maximum load of the target substation in the first maximum load period; n A1 is the number of data points that the load data of the target transformer substation in the first maximum load period is greater than 80% of the maximum load of the target transformer substation; n total1 is the total number of data points of the target substation in the first maximum load period; p 2 is the ratio of the load of the target substation in the second maximum load period to be greater than 80% of the own maximum load; n A2 is the number of data points that the target substation load data in the second maximum load period is greater than 80% of the target substation maximum load; n total2 is the total number of data points of the target substation within the second maximum load period.
3. The method for configuring the energy storage capacity of the transformer substation based on the load characteristics according to claim 2, wherein the determining the energy storage operation state of the target transformer substation according to the ratio obtained in step S2 in step S3 specifically comprises the following steps:
If the ratio of the load to 80% of the maximum load is greater than or equal to a set value, the energy storage operation working state of the transformer substation is determined to be a first state; the first state applies energy storage to the substation so that the substation load rate is maintained at a set level and the load peak is reduced in a first maximum load period and a second maximum load period;
if the ratio of the load to 80% of the maximum load is smaller than the set value, the energy storage operation working state of the transformer substation is determined to be a second state; the second state is to apply energy storage to the transformer substation, so that the transformer substation reduces the load peak value of the transformer substation in the first maximum load period and the second maximum load period, and the transformer substation is guaranteed not to have heavy load.
4. The method for configuring energy storage capacity of a transformer substation based on load characteristics according to claim 3, wherein the calculating capacity of the energy storage configuration obtained in step S4 in step S5 determines a final energy storage configuration capacity of the transformer substation, and specifically comprises the following steps:
And (3) taking a larger value as the final energy storage configuration capacity of the transformer substation according to the energy storage configuration calculation capacity of the first maximum load period and the energy storage configuration calculation capacity of the second maximum load period obtained in the step (S4).
5. A system for implementing the method for configuring the energy storage capacity of the transformer substation based on the load characteristics according to any one of claims 1 to 4, which is characterized by comprising a data acquisition module, a ratio calculation module, an operation state confirmation module, a capacity calculation module and an energy storage configuration module; the data acquisition module, the ratio calculation module, the running state confirmation module, the capacity calculation module and the energy storage configuration module are sequentially connected in series; the data acquisition module is used for acquiring historical data information of the target transformer substation and uploading the data to the ratio calculation module; the ratio calculation module is used for selecting a maximum load period according to the received data, calculating the ratio that the load of the target transformer substation in the maximum load period is greater than 80% of the maximum load of the target transformer substation, and uploading the data to the running state confirmation module; the operation state confirmation module is used for determining the energy storage operation state of the target transformer substation according to the received data and uploading the data to the capacity calculation module; the capacity calculation module is used for setting an objective function and corresponding constraint conditions of energy storage configuration according to the received data, solving the energy storage configuration calculation capacity of the maximum load period, and uploading the data to the energy storage configuration module; the energy storage configuration module is used for determining the final energy storage configuration capacity of the transformer substation according to the received data and completing the energy storage capacity configuration of the transformer substation based on the load characteristics.
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