CN110571838B - Energy storage battery early peak load reduction control method and device - Google Patents
Energy storage battery early peak load reduction control method and device Download PDFInfo
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Abstract
The invention discloses an energy storage battery early peak load reduction control method, which comprises the steps of obtaining a load characteristic curve of a transformer substation or a regional power grid; setting a discharge power threshold of an energy storage battery according to the rated power of a transformer substation or the highest load of a regional power grid; determining a discharging time interval and electric quantity to be discharged, a charging time interval and electric quantity to be charged of the energy storage battery aiming at the early peak load period by adjusting a discharging power threshold; calculating the charging power at each charging moment to control the energy storage battery to store energy; and calculating the discharge power at each discharge moment to control the energy storage battery to release energy. The invention also discloses a control device for reducing the early peak load of the energy storage battery. The energy storage battery energy storage early-peak load reduction method can calculate the charging and discharging time and power of the energy storage battery in a self-adaptive manner, control the energy storage battery to store energy aiming at the load peak time and release energy aiming at the load valley time, and achieve energy storage early-peak load reduction.
Description
Technical Field
The invention relates to the technical field of energy storage application, in particular to a control method and device for early peak load reduction of an energy storage battery.
Background
The charge-discharge characteristics of the battery energy storage system can realize the space-time translation of energy, which is beneficial to stabilizing the peak-valley difference of the power grid, improving the power supply reliability of the power grid, promoting the consumption of clean energy, optimizing the power resource allocation and greatly improving the flexibility of the power system. The energy storage battery has the characteristics of quick response, accurate control and bidirectional energy flow, and gradually becomes an important element of a smart power grid, an electric power internet of things and the like. For example, configuring an energy storage battery in an electric power system is an effective scheme for realizing peak clipping and valley filling, and by discharging at a peak load and charging at a valley load, the load characteristics of a power grid can be greatly improved and optimized, so that the method has great significance for improving the safety of the power grid, delaying the construction of power transformation and utilization equipment, and the like.
In the existing energy storage peak clipping and valley filling method, most of the energy storage peak clipping and valley filling charge and discharge optimization is carried out by combining a load curve and an operation target according to constraint conditions of an energy storage battery, including battery charge and discharge power constraint, charge state constraint, capacity constraint and the like. The control method solves the problem by a scientific calculation tool or a heuristic intelligent algorithm through fine modeling, and has the disadvantages of simple and convenient calculation and complex operation.
Disclosure of Invention
The embodiment of the invention aims to provide an energy storage battery early-peak load reduction control method and device, which can calculate the charging and discharging time and power of an energy storage battery in a self-adaptive manner, control the energy storage battery to store energy aiming at the load peak time in the early-peak period and release energy aiming at the load valley time, realize energy storage early-peak load reduction, and have the advantages of simple calculation method and convenient operation.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling early peak load reduction of an energy storage battery, including:
acquiring a load characteristic curve of a transformer substation or a regional power grid;
setting a load overload threshold value as a discharge power threshold value of an energy storage battery according to the rated power of a transformer substation or the highest load of a regional power grid;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; wherein the dischargeable electric quantity is determined by the state of charge and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged;
calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; according to the discharge power threshold, calculating the discharge power of each discharge moment in the discharge time interval;
controlling the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; and controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time.
As an improvement of the above scheme, the discharging power threshold is adjusted according to a first preset step length, and a discharging time interval and an electric quantity to be discharged of the energy storage battery at an early peak load period are determined, so that the electric quantity to be discharged is less than or equal to a dischargeable electric quantity of the energy storage battery; and determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged, specifically comprising the following steps:
s11, determining the discharge time interval of the energy storage battery according to the discharge power threshold, and calculating the electric quantity of the energy storage battery needing to be discharged;
s12, judging the relationship between the electric quantity to be discharged and the dischargeable electric quantity of the energy storage battery; if the electric quantity to be discharged is larger than the dischargeable electric quantity of the energy storage battery, increasing the discharge power threshold by a first preset step length, and jumping to the step S11; if the electric quantity needing to be discharged is less than or equal to the dischargeable electric quantity of the energy storage battery, jumping to step S13;
s13, determining a charging time interval of the energy storage battery by taking the discharging power threshold as a charging power threshold of the energy storage battery, and calculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s14, judging the relationship between the chargeable electric quantity and the electric quantity needing to be discharged; if the chargeable electric quantity is smaller than the electric quantity needing discharging, increasing the discharging power threshold value by the first preset step length, and jumping to the step S11; and if the chargeable electric quantity is larger than or equal to the electric quantity to be discharged, determining a final charging power threshold value, a charging time interval and the electric quantity to be charged.
As an improvement of the above scheme, if the chargeable electric quantity is greater than or equal to the electric quantity to be discharged, the determining the final charging power threshold, the charging time interval, and the electric quantity to be charged specifically includes:
s21, reducing the charging power threshold by a second preset step length, and recalculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s22, if the chargeable electric quantity is larger than or equal to the electric quantity needing to be discharged, taking the charging power threshold as the discharging power threshold, and jumping to the step S11;
and S23, if the chargeable electric quantity is smaller than the electric quantity to be discharged, increasing the charging power threshold value by the second preset step length, and determining the charging time interval and the electric quantity to be charged of the energy storage battery.
As an improvement of the above scheme, a time period corresponding to a power value higher than the discharge power threshold value in an early peak load period on the load characteristic curve is used as a discharge time interval of the energy storage battery;
and taking a time period corresponding to a power value lower than the charging power threshold value in an early peak load period on the load characteristic curve as a charging time interval of the energy storage battery.
As an improvement of the above, the dischargeable electric quantity satisfies a calculation formula:
QES_d＝CES×(SOC0-SOCmin)×ηd；
wherein Q isES_dTo the dischargeable electric quantity, CESIs the rated capacity, SOC, of the energy storage battery0Is the initial state of charge, SOC, of the energy storage batteryminIs the minimum allowable state of charge, η, of the energy storage celldThe discharge efficiency of the energy storage battery.
As an improvement of the above scheme, the discharge electric quantity satisfies a calculation formula:
wherein Q isdTo said quantity of electricity to be discharged, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the discharging moment in the discharging time interval.
As an improvement of the above scheme, the chargeable electric quantity satisfies a calculation formula:
QES_c＝Qc×ηc×ηd；
wherein Q isES_cIs the chargeable electric quantity, etacIs the charging efficiency, eta, of the energy storage batterydFor the discharge efficiency, Q, of the energy storage cellcThe required charging capacity of the energy storage battery is obtained;
the electric quantity to be charged meets a calculation formula:
wherein, PcIs the charging power threshold, PESAnd P (t) is the rated power of the energy storage battery, P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the charging moment in the charging time interval.
As an improvement of the above scheme, the charging power at each charging time within the charging time interval specifically satisfies a calculation formula:
the discharge power at each discharge moment in the discharge time interval specifically satisfies a calculation formula:
wherein, Pc(t) every charging in a charging time intervalCharging power at electric time, Pd(t) is the discharge power at each discharge moment in the discharge time interval; pcIs the charging power threshold, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve.
As an improvement of the above solution, the method for controlling the early peak load reduction of the energy storage battery further includes the steps of:
calculating the charge state of the energy storage battery at each moment according to the charging power and the discharging power of the energy storage battery;
the state of charge of the energy storage battery at each moment satisfies the formula:
wherein SOC (t) is the state of charge at each time, SOC0Is the initial state of charge value, C, of the energy storage cellESThe rated capacity of the energy storage battery.
The embodiment of the invention also provides a control device for reducing the early peak load of the energy storage battery, which comprises a load acquisition module, an information processing module and a central control module; wherein the content of the first and second substances,
the load acquisition module is used for acquiring a load characteristic curve of a transformer substation or a regional power grid;
the information processing module is used for setting a load overload threshold value as a discharge power threshold value of the energy storage battery according to the rated power of a transformer substation or the highest load of a regional power grid;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; wherein the dischargeable electric quantity is determined by the state of charge and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged;
calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; according to the discharge power threshold, calculating the discharge power of each discharge moment in the discharge time interval;
the central control module is used for controlling the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; and controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time.
Compared with the prior art, the method and the device for controlling the early peak load reduction of the energy storage battery, disclosed by the invention, have the advantages that the load characteristic curve of a transformer substation or regional power grid is obtained, and the load heavy-load threshold is set and used as the initial discharge power threshold of the energy storage battery. And determining a charging power threshold, a charging and discharging time interval, charging and discharging power and the required charging and discharging electric quantity of the energy storage battery which meet the conditions by adjusting the discharging power threshold, so as to control the energy storage battery to release the electric quantity in the load peak period aiming at the early peak load and store the electric quantity in the load valley period. The energy storage early peak load reduction is realized by self-adaptively controlling the charging and discharging mode of the energy storage battery aiming at the load early peak, and the calculation method is simple and convenient to operate.
Drawings
Fig. 1 is a schematic flowchart of a control method for reducing an early peak load of an energy storage battery according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of an optimized energy storage battery early peak load reduction control method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a method for determining a discharging time interval and a charging time interval in an early peak load period according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of an original load characteristic curve and a reduced load characteristic curve of a substation or a regional power grid within one day according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the charging and discharging time and the charging and discharging power of the energy storage battery during the early peak load period according to the first embodiment of the invention;
FIG. 6 is a schematic diagram illustrating the change of the state of charge of the energy storage battery after load shedding during the early peak load period according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an early peak load reduction control device for an energy storage battery according to a second 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.
Example one
Fig. 1 is a schematic flow chart of a control method for reducing load of an energy storage battery during an early peak period according to an embodiment of the present invention. The energy storage battery early peak load reduction control method provided by the first embodiment of the invention is executed through steps S1 to S5:
and S1, acquiring a load characteristic curve of the substation or regional power grid.
The load characteristic curve is a graph of the predicted load change along with the change of time. The energy storage battery can be connected with a data interface of a transformer substation or a regional power grid to obtain a load characteristic curve in real time, so that a predicted load curve graph changing along with time is obtained.
And S2, setting a load heavy-load threshold value as the discharge power threshold value of the energy storage battery according to the rated power of the transformer substation or the highest load of the regional power grid.
Specifically, the load overload threshold may be set to 80% of the rated transformer power of the substation, or may be 80% of the highest load in the load characteristic curve of the regional power grid. And setting the load overloading threshold as an initial discharging power threshold of the energy storage battery.
S3, adjusting the discharge power threshold according to a first preset step length, and determining the discharge time interval and the electric quantity to be discharged of the energy storage battery in the early peak load period so as to enable the electric quantity to be discharged to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; the dischargeable electric quantity is determined by the charge state and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged.
Specifically, the dischargeable electric quantity of the energy storage battery is calculated according to the charge state and the battery characteristics of the energy storage battery. And determining the discharge time interval of the energy storage battery according to the initial discharge power threshold value, and calculating the electric quantity of the energy storage battery to be discharged. If the calculation result does not satisfy the condition that the electric quantity required to be discharged is less than or equal to the electric quantity capable of being discharged of the energy storage battery, it is indicated that the electric quantity capable of being discharged of the energy storage battery cannot satisfy the discharge requirement of the energy storage battery in the peak time period, and the discharge requirement of the energy storage battery needs to be further reduced. And increasing the discharge power threshold by the first preset step length, and recalculating the electric quantity required to be discharged until the calculation result meets the condition that the electric quantity required to be discharged is less than or equal to the dischargeable electric quantity of the energy storage battery.
And taking the discharging power threshold value meeting the condition as the charging power threshold value of the energy storage battery, determining the charging time interval of the energy storage battery according to the charging power threshold value, and determining the electric quantity of the energy storage battery to be discharged. According to the preset positive correlation relation between the electric quantity required to be discharged and the electric quantity capable of being discharged of the energy storage battery, calculating the chargeable electric quantity of the energy storage battery, judging whether the chargeable electric quantity of the energy storage battery is larger than or equal to the electric quantity required to be discharged, and if not, indicating that the chargeable electric quantity of the energy storage battery does not meet the discharge requirement in the load peak period, and further reducing the electric quantity required to be discharged of the energy storage battery. Therefore, the discharge power threshold needs to be increased again, and the charge and discharge electric quantity of the energy storage battery needs to be recalculated until the condition that the chargeable electric quantity of the energy storage battery is greater than or equal to the discharge electric quantity is met, so that the control of the charge and discharge electric quantity of the energy storage battery is realized aiming at the load reduction of the energy storage battery in the peak load period.
Preferably, referring to fig. 2, a flowchart of an optimized energy storage battery early peak load reduction control method according to an embodiment of the present invention is shown. Step S3 may be performed by steps S11 to S14:
s11, determining the discharge time interval of the energy storage battery according to the discharge power threshold, and calculating the electric quantity of the energy storage battery needing to be discharged;
specifically, a time period corresponding to a power value higher than the discharge power threshold value in an early peak load period on the load characteristic curve is used as the discharge time interval of the energy storage battery. Wherein, the early peak load time is 7 in the morning on the load characteristic curve: 00 to 12: load period between 00. For example, referring to fig. 3, a schematic diagram of a method for determining a discharging time interval and a charging time interval in an early peak load period according to a first embodiment of the present invention is shown. Reloading threshold P with load0As initial discharge power threshold value Pd. Determining a discharge power threshold value P on a load characteristic curvedAt the corresponding time point, will be higher than the discharge power threshold PdTime period t corresponding to the power value of1To t2The discharge time interval is determined. And according to said discharge power threshold PdCalculating the discharge electric quantity Q of the energy storage batteryd。
It can be understood that, if the time point of the discharge power threshold on the compliance curve cannot be determined, the time period higher than the time period corresponding to the nearest power value on the load characteristic curve may be used as the discharge time interval of the energy storage battery by determining the power value nearest to the discharge power threshold on the load characteristic curve, without affecting the beneficial effects obtained by the present invention.
Wherein, the electric quantity needing to be discharged meets a calculation formula:
wherein Q isdTo said quantity of electricity to be discharged, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the discharging moment in the discharging time interval.
S12, judging the relationship between the electric quantity to be discharged and the dischargeable electric quantity of the energy storage battery; if the electric quantity to be discharged is larger than the dischargeable electric quantity of the energy storage battery, increasing the discharge power threshold by a first preset step length, and jumping to the step S11; if the electric quantity needing to be discharged is less than or equal to the dischargeable electric quantity of the energy storage battery, jumping to step S13;
specifically, the dischargeable electric quantity satisfies a calculation formula:
QES_d＝CES×(SOC0-SOCmin)×ηd；
wherein Q isES_dTo the dischargeable electric quantity, CESIs the rated capacity, SOC, of the energy storage battery0Is the initial state of charge, SOC, of the energy storage batteryminIs the minimum allowable state of charge, η, of the energy storage celldThe discharge efficiency of the energy storage battery.
When the electricity quantity Q needs to be dischargeddGreater than the dischargeable electric quantity Q of the energy storage batteryES_dAt a first preset step delta1Increasing the discharge power threshold Pd. For example, as shown in FIG. 3, when the initial discharge power threshold P is useddCalculated electric quantity Q required to be dischargeddSatisfy and be greater than but energy storage battery's dischargeable electric quantity QES_dUnder the condition of (1), i.e. Qd>QES_dThen, the initial discharge power threshold value P is setdIncreasing a first preset step delta1Obtaining a discharge power threshold value PdWill be higher than the discharge power threshold Pd'power value of' corresponds to a time period t1To t2' re-determining the discharge time interval, and re-calculating the discharge electric quantity of the corresponding energy storage battery. When Q isd≤QES_dAnd then, the dischargeable electric quantity of the energy storage battery preliminarily meets the discharge requirement of the energy storage battery in the peak time period, and the next operation is carried out.
It is to be understood that the first preset step may be any one specific value determined according to actual situations, and is not limited herein.
S13, determining a charging time interval of the energy storage battery by taking the discharging power threshold as a charging power threshold of the energy storage battery, and calculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
referring to fig. 3, as an example, the discharge power threshold value P calculated to satisfy the condition of step S12d' as charging power threshold PcTaking a time period corresponding to a power value lower than the charging power threshold value in an early peak load period on the load characteristic curve as a charging time interval of the energy storage battery, namely taking t as2To t3The time period is determined as the charging time interval. According to the charging time threshold value PcAnd calculating the electric quantity of the energy storage battery to be charged.
It can be understood that, if the time point of the charging power threshold on the compliance characteristic curve cannot be determined, the time period corresponding to the power value that is closest to the charging power threshold on the load characteristic curve may be determined to be a time period that is lower than the time period corresponding to the closest power value, and the time period is not used as the charging time interval of the energy storage battery, which does not affect the beneficial effects obtained by the present invention.
The electric quantity of the energy storage battery to be charged meets a calculation formula:
wherein, PcIs the charging power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the charging moment in the charging time interval.
The chargeable electric quantity meets the calculation formula:
QES_c＝Qc×ηc×ηd；
wherein Q isES _cIs the chargeable electric quantity, etacIs the charging efficiency, eta, of the energy storage batterydFor the discharge efficiency, Q, of the energy storage cellcThe required charging capacity of the energy storage battery is obtained;
s14, judging the relationship between the chargeable electric quantity and the electric quantity needing to be discharged; if the chargeable electric quantity is smaller than the electric quantity needing discharging, increasing the discharging power threshold value by the first preset step length, and jumping to the step S11; and if the chargeable electric quantity is larger than or equal to the electric quantity to be discharged, determining a final charging power threshold value, a charging time interval and the electric quantity to be charged.
When the chargeable electric quantity QES_cLess than the discharge electric quantity QdWhen is, i.e. QES_c<QdWhen the energy storage battery is charged, the rechargeable electric quantity of the energy storage battery does not meet the discharge requirement in the load peak period, and the electric quantity required to be discharged of the energy storage battery needs to be further reduced. Increasing the initial discharge power threshold by a first preset step delta1Then, a new discharge power threshold is obtained, and the calculation in step S11 is performed again. When the chargeable electric quantity QES_cIs more than or equal to the electric quantity Q to be dischargeddWhen is, i.e. QES_c>QdWhen the charging power threshold value, the charging time interval and the electric quantity to be charged are obtained by calculation, the charging power threshold value, the charging time interval and the electric quantity to be charged are directly used as control parameters of the energy storage battery to carry out peak load reduction operation.
Preferably, according to step 14, when the resulting Q is calculatedES_c>QdWhen the discharge time is short, the rechargeable electric quantity of the energy storage battery meets the discharge requirement in the peak load period. But to prevent the chargeable capacity Q of the energy storage cellES_cFar greater than the discharge electric quantity QdResulting in the required charging capacity Q of the energy storage batterycIf the charging power threshold is too large, the charging power threshold and the charging amount of the energy storage battery may be confirmed again through steps S21 to S23.
S21, reducing the charging power threshold by a second preset step length, and recalculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s22, if the chargeable electric quantity is larger than or equal to the electric quantity needing to be discharged, taking the charging power threshold as the discharging power threshold, and jumping to the step S11;
and S23, if the chargeable electric quantity is smaller than the electric quantity to be discharged, increasing the charging power threshold value by the second preset step length, and determining the charging time interval and the electric quantity to be charged of the energy storage battery.
Subtracting the second preset step size delta from the charging power threshold calculated and determined in step S142And recalculating the charging required capacity and the chargeable capacity of the energy storage battery according to the obtained new charging power threshold. If the chargeable electric quantity still meets the requirement of being more than or equal to the electric quantity needing to be discharged at the moment, the original electric quantity Q needing to be charged of the energy storage battery is verifiedcToo large. The charging power threshold is used as the discharging power threshold, and the process goes to step S11 to re-determine the discharging time interval, the discharging power amount, and the like. If the chargeable electric quantity is smaller than the electric quantity to be discharged, the original electric quantity Q to be charged of the energy storage battery is showncJust meeting the charging requirement, the charging power threshold is increased again by the second preset step length delta2And determining the final charging time interval and the electric quantity to be charged of the energy storage battery.
It is to be understood that the second preset step may be any one specific value determined according to actual situations, and is not limited herein.
S4, calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; and calculating the discharge power of each discharge moment in the discharge time interval according to the discharge power threshold.
Specifically, the charging power at each charging time in the charging time interval specifically satisfies a calculation formula:
the discharge power at each discharge moment in the discharge time interval specifically satisfies a calculation formula:
wherein, PcIs the charging power threshold, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve.
S5, controlling the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; and controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time.
Further, the energy storage battery early peak load reduction control method further comprises the following steps:
calculating the charge state of the energy storage battery at each moment according to the charging power and the discharging power of the energy storage battery;
the state of charge of the energy storage battery at each moment satisfies the formula:
wherein SOC (t) is the state of charge at each time, SOC0Is the energy storage batteryInitial state of charge value of, CESThe rated capacity of the energy storage battery.
For example, taking an energy storage battery participating in the peak early peak load reduction of a power grid in a certain area as an example, the relevant parameters of the state of charge and the battery characteristics of the energy storage battery are shown in table 1 below.
According to the relevant parameter values in the table 1, the charging and discharging time intervals of the energy storage battery aiming at the early peak load time period and the charging and discharging power corresponding to each charging and discharging moment are calculated, and the energy storage battery is controlled to carry out corresponding charging and discharging operations, so that the reduction operation of the early peak load is realized. Referring to fig. 4 and 5, fig. 4 is a schematic diagram of an original load characteristic curve and a reduced load characteristic curve of a power grid of a certain substation or a certain area in one day; fig. 5 is a schematic diagram of charge and discharge times and charge and discharge powers of an energy storage battery during an early peak load period. As can be seen from fig. 4, during the early peak load period of the energy storage battery, the peak load of the predicted load characteristic curve is effectively reduced by the discharging operation of the energy storage battery, and the energy of the energy storage battery is supplemented by the charging operation of the energy storage battery. By the early peak load reduction method, the predicted load early peak characteristic curve is changed into a smooth load curve, the load characteristic of the power grid is optimized, and the method has great significance for improving the safety of the power grid.
Fig. 6 is a schematic diagram of the change of the state of charge of the energy storage battery after load shedding during the early peak load period according to the first embodiment of the present invention. In the above example, the state of charge of the energy storage battery at each instant of early peak load is calculated based on the initial state of charge of the energy storage battery and the associated battery characteristics. Therefore, the state of charge value of the energy storage battery is within the limited range of the energy storage battery, the early peak load reduction control method of the energy storage battery meets the operating characteristics and the technical characteristics of the energy storage battery, and the early peak load reduction mode aiming at a transformer substation or a regional power grid can be reasonably optimized.
It can be understood that the above-mentioned scenarios and values are only examples, and in practical applications, load characteristic curves of power grids in different substations and regions may be obtained, and the early peak load reduction mode of the local energy storage battery is controlled according to the state of charge of the energy storage battery in different regions and related parameters of battery characteristics, without affecting the beneficial effects obtained by the present invention.
The method for controlling early peak load reduction of the energy storage battery provided by the embodiment of the invention is used for acquiring a load characteristic curve of a power grid of a transformer substation or a region, and setting a load heavy-load threshold as an initial discharge power threshold of the energy storage battery. And determining a charging power threshold, a charging and discharging time interval, charging and discharging power and the required charging and discharging electric quantity of the energy storage battery which meet the conditions by adjusting the discharging power threshold, so as to control the energy storage battery to release the electric quantity in the load peak period aiming at the early peak load and store the electric quantity in the load valley period. The energy storage early peak load reduction is realized by self-adaptively controlling the charging and discharging mode of the energy storage battery aiming at the load early peak, and the calculation method is simple and convenient to operate.
Example two
Fig. 7 is a schematic structural diagram of an energy storage battery early peak load reduction control device 20 according to a second embodiment of the present invention. Comprises a load acquisition module 21, an information processing module 22 and a central control module 23; wherein the content of the first and second substances,
the load obtaining module 21 is configured to obtain a load characteristic curve of a substation or a regional power grid;
the information processing module 22 is configured to set a load overload threshold as a discharge power threshold of the energy storage battery according to the rated power of the transformer of the substation or the highest load of the regional power grid;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; wherein the dischargeable electric quantity is determined by the state of charge and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged;
calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; according to the discharge power threshold, calculating the discharge power of each discharge moment in the discharge time interval;
the central control module 23 is configured to control the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; and controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time.
The working process of the energy storage battery early peak load reduction control device 20 is the same as the method of the energy storage battery load early peak load reduction control device provided in the first embodiment, and is not described herein again.
In the energy storage battery early peak load reduction control device provided by the second embodiment of the invention, the load acquisition module acquires a load characteristic curve of a transformer substation or a regional power grid. The information processing module sets a load heavy-load threshold as an initial discharge power threshold of the energy storage battery; and determining a charging power threshold, a charging and discharging time interval, charging and discharging power and the required charging and discharging electric quantity of the energy storage battery which meet the conditions by adjusting the discharging power threshold. And the central control module controls the energy storage battery to release the electric quantity at the early peak period of the load and store the electric quantity at the low valley period of the load. The early peak load reduction is realized by self-adaptively controlling the charging and discharging mode of the energy storage battery aiming at the early peak of the load, and the calculation method is simple and convenient to operate.
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 battery early peak load reduction control method is characterized by comprising the following steps:
acquiring a load characteristic curve of a transformer substation or a regional power grid;
setting a load overload threshold value as a discharge power threshold value of an energy storage battery according to the rated power of a transformer substation or the highest load of a regional power grid;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; wherein the dischargeable electric quantity is determined by the state of charge and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged;
calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; according to the discharge power threshold, calculating the discharge power of each discharge moment in the discharge time interval;
controlling the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time;
the chargeable electric quantity meets the calculation formula:
QES_c＝Qc×ηc×ηd；
wherein Q isES_cIs the chargeable electric quantity, etacIs the charging efficiency, eta, of the energy storage batterydFor the discharge efficiency, Q, of the energy storage cellcBeing said energy storage batteryThe electric quantity needs to be charged;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; and determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged, specifically comprising the following steps:
s11, determining the discharge time interval of the energy storage battery in the early peak load period according to the discharge power threshold, and calculating the electric quantity of the energy storage battery to be discharged;
s12, judging the relationship between the electric quantity to be discharged and the dischargeable electric quantity of the energy storage battery; if the electric quantity to be discharged is larger than the dischargeable electric quantity of the energy storage battery, increasing the discharge power threshold by a first preset step length, and jumping to the step S11; if the electric quantity needing to be discharged is less than or equal to the dischargeable electric quantity of the energy storage battery, jumping to step S13;
s13, determining a charging time interval of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold of the energy storage battery, and calculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s14, judging the relationship between the chargeable electric quantity and the electric quantity needing to be discharged; if the chargeable electric quantity is smaller than the electric quantity needing discharging, increasing the discharging power threshold value by the first preset step length, and jumping to the step S11; and if the chargeable electric quantity is larger than or equal to the electric quantity to be discharged, determining a final charging power threshold value, a charging time interval and the electric quantity to be charged.
2. The method as claimed in claim 1, wherein the determining the final charging power threshold, the charging time interval and the amount of energy to be charged if the amount of chargeable power is greater than or equal to the amount of energy to be discharged specifically comprises:
s21, reducing the charging power threshold by a second preset step length, and recalculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s22, if the chargeable electric quantity is larger than or equal to the electric quantity needing to be discharged, taking the charging power threshold as the discharging power threshold, and jumping to the step S11;
and S23, if the chargeable electric quantity is smaller than the electric quantity to be discharged, increasing the charging power threshold value by the second preset step length, and determining the charging time interval and the electric quantity to be charged of the energy storage battery.
3. The method as claimed in claim 1, wherein the time period corresponding to the power value higher than the discharge power threshold value in the early peak load period on the load characteristic curve is used as the discharge time interval of the energy storage battery;
and taking a time period corresponding to a power value lower than the charging power threshold value in an early peak load period on the load characteristic curve as a charging time interval of the energy storage battery.
4. The method according to any one of claims 1 to 3, wherein the dischargeable electric quantity satisfies a calculation formula:
QES_d＝CES×(SOC0-SOCmin)×ηd；
wherein Q isES_dTo the dischargeable electric quantity, CESIs the rated capacity, SOC, of the energy storage battery0Is the initial state of charge, SOC, of the energy storage batteryminIs the minimum allowable state of charge, η, of the energy storage celldThe discharge efficiency of the energy storage battery.
5. The method as claimed in claim 4, wherein the discharge demand electric quantity satisfies a calculation formula:
wherein Q isdTo said quantity of electricity to be discharged, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the discharging moment in the discharging time interval.
6. The method as claimed in claim 5, wherein the amount of electricity to be charged satisfies the following formula:
wherein, PcIs the charging power threshold, PESAnd P (t) is the rated power of the energy storage battery, P (t) is the load value corresponding to each moment on the load characteristic curve, and t is the charging moment in the charging time interval.
7. The method as claimed in claim 6, wherein the charging power at each charging time in the charging time interval specifically satisfies the following formula:
the discharge power at each discharge moment in the discharge time interval specifically satisfies a calculation formula:
wherein, Pc(t) is chargingCharging power, P, at each charging moment in a time intervald(t) is the discharge power at each discharge moment in the discharge time interval; pcIs the charging power threshold, PdIs the discharge power threshold, PESAnd P (t) is the load value corresponding to each moment on the load characteristic curve.
8. The method of claim 7, wherein the method further comprises the steps of:
calculating the charge state of the energy storage battery at each moment according to the charging power and the discharging power of the energy storage battery;
the state of charge of the energy storage battery at each moment satisfies the formula:
wherein SOC (t) is the state of charge at each time, SOC0Is the initial state of charge value, C, of the energy storage cellESThe rated capacity of the energy storage battery.
9. The control device for reducing the load of the energy storage battery in the early peak period is characterized by comprising a load acquisition module, an information processing module and a central control module; wherein the content of the first and second substances,
the load acquisition module is used for acquiring a load characteristic curve of a transformer substation or a regional power grid;
the information processing module is used for setting a load overload threshold value as a discharge power threshold value of the energy storage battery according to the rated power of a transformer substation or the highest load of a regional power grid;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged; wherein the dischargeable electric quantity is determined by the state of charge and the battery characteristics of the energy storage battery, and the chargeable electric quantity is positively correlated with the electric quantity to be charged;
calculating the charging power of each charging moment in the charging time interval according to the charging power threshold; according to the discharge power threshold, calculating the discharge power of each discharge moment in the discharge time interval;
the central control module is used for controlling the energy storage battery to store energy at the corresponding charging time according to the charging power at each charging time; controlling the energy storage battery to release energy at the corresponding discharge time according to the discharge power at each discharge time;
the chargeable electric quantity meets the calculation formula:
QES_c＝Qc×ηc×ηd；
wherein Q isES_cIs the chargeable electric quantity, etacIs the charging efficiency, eta, of the energy storage batterydFor the discharge efficiency, Q, of the energy storage cellcThe required charging capacity of the energy storage battery is obtained;
adjusting the discharge power threshold according to a first preset step length, and determining a discharge time interval and discharge-required electric quantity of the energy storage battery in an early peak load period so as to enable the discharge-required electric quantity to be smaller than or equal to the dischargeable electric quantity of the energy storage battery; and determining a charging time interval and an electric quantity to be charged of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold so as to enable the chargeable electric quantity of the energy storage battery to be larger than or equal to the electric quantity to be discharged, specifically comprising the following steps:
s11, determining the discharge time interval of the energy storage battery in the early peak load period according to the discharge power threshold, and calculating the electric quantity of the energy storage battery to be discharged;
s12, judging the relationship between the electric quantity to be discharged and the dischargeable electric quantity of the energy storage battery; if the electric quantity to be discharged is larger than the dischargeable electric quantity of the energy storage battery, increasing the discharge power threshold by a first preset step length, and jumping to the step S11; if the electric quantity needing to be discharged is less than or equal to the dischargeable electric quantity of the energy storage battery, jumping to step S13;
s13, determining a charging time interval of the energy storage battery in an early peak load period by taking the discharging power threshold as a charging power threshold of the energy storage battery, and calculating the electric quantity to be charged and the chargeable electric quantity of the energy storage battery;
s14, judging the relationship between the chargeable electric quantity and the electric quantity needing to be discharged; if the chargeable electric quantity is smaller than the electric quantity needing discharging, increasing the discharging power threshold value by the first preset step length, and jumping to the step S11; and if the chargeable electric quantity is larger than or equal to the electric quantity to be discharged, determining a final charging power threshold value, a charging time interval and the electric quantity to be charged.
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