CN112653163B - Energy storage system power distribution method and energy storage system - Google Patents
Energy storage system power distribution method and energy storage system Download PDFInfo
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- CN112653163B CN112653163B CN202011518859.3A CN202011518859A CN112653163B CN 112653163 B CN112653163 B CN 112653163B CN 202011518859 A CN202011518859 A CN 202011518859A CN 112653163 B CN112653163 B CN 112653163B
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The method is used for responding to a power instruction comprising total power to be distributed, acquiring the residual service life and rated power of each energy storage subsystem in the energy storage system, distributing the total power to be distributed based on the residual service life and rated power of each energy storage subsystem, distributing the total power to be distributed by the energy storage subsystem with larger residual service life in the energy storage system with priority to share the total power to be distributed in full load, and distributing the distributed power of each energy storage subsystem to the corresponding energy storage subsystem. According to the method provided by the application, the residual service life and rated power of the energy storage subsystem are used as the basis for power distribution, so that the energy storage subsystem with large residual service life runs at full load preferentially, and more charge and discharge operations are performed, so that the residual service lives of all the energy storage subsystems in the energy storage system can be kept consistent, the complexity of integrally controlling the energy storage system is reduced, and the overall usability of the energy storage system is improved.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a power distribution method of an energy storage system and the energy storage system.
Background
In recent years, along with the annual reduction of the cost of the energy storage system, the energy storage system is gradually applied on a large scale in the aspects of auxiliary new energy grid connection, frequency modulation, energy movement, micro-grid and the like, and due to the annual reduction of the cost of the energy storage system, some application scenes select to reserve energy storage capacity, namely the energy storage system is divided into a plurality of energy storage subsystems, each energy storage subsystem is put into operation in batches according to the capacity requirement, and the reduction trend of the energy storage cost is combined, so that the initial investment cost of the whole energy storage system is reduced while the excessive investment of funds is avoided.
However, for such energy storage systems, there is an unavoidable difference in the operation time of each energy storage subsystem in the system, and the difference in operation time necessarily causes a difference in service life of the energy storage subsystems, and often, the longer the interval of operation time is, the greater the difference in service life of each energy storage subsystem is, which not only increases the complexity of overall controlling the energy storage system, but also affects the overall usability of the energy storage system.
Disclosure of Invention
The application provides a power distribution method of an energy storage system and the energy storage system, which are used for distributing total power to be distributed based on the residual service life and rated power of each energy storage subsystem in the energy storage system, so that the residual service life of each energy storage subsystem tends to be balanced, and the problems in the prior art are solved.
In order to achieve the above purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present application provides a method for distributing power of an energy storage system, including:
acquiring a power instruction comprising the total power to be distributed;
responding to the power instruction, and acquiring the residual service life and rated power of each energy storage subsystem in the energy storage system;
distributing the total power to be distributed based on the residual service life and rated power of each energy storage subsystem, and preferentially sharing the total power to be distributed by using the energy storage subsystem with larger residual service life in the energy storage systems;
and transmitting the sharing power of each energy storage subsystem to the corresponding energy storage subsystem.
Optionally, the total power to be allocated is allocated based on the remaining life and rated power of each energy storage subsystem, and the energy storage subsystem with the larger remaining life in the energy storage system shares the total power to be allocated with full load preferentially, including:
based on the remaining service life and rated power of each energy storage subsystem, initially distributing the total power to be distributed to obtain initial shared power of each energy storage subsystem;
and adjusting the initial sharing power of the first M energy storage subsystems to corresponding rated power according to the sequence of the residual life from large to small, and obtaining the final sharing power of each energy storage subsystem, wherein M is greater than or equal to 1.
Optionally, the final shared power of any one of the energy storage subsystems in the energy storage system is not greater than the respective rated power.
Optionally, before the initial power sharing of the first M energy storage subsystems is adjusted to the corresponding rated power according to the order from the large to the small of the remaining life, the method further includes:
judging whether the initial shared power of any energy storage subsystem is larger than the rated power of the energy storage subsystem or not;
if any of the initial shared power of the energy storage subsystems is larger than the rated power of the energy storage subsystem, executing the steps of adjusting the initial shared power of the first M energy storage subsystems to the corresponding rated power according to the sequence from the large residual life to the small residual life to obtain the final shared power of each energy storage subsystem;
and if the initial shared power of each energy storage subsystem is smaller than or equal to the rated power of the energy storage subsystem, taking the initial shared power as the final shared power of the corresponding energy storage subsystem.
Optionally, the acquiring the remaining life of each energy storage subsystem in the energy storage system includes:
acquiring the service life and rated service life of each energy storage subsystem in the energy storage system;
and regarding each energy storage subsystem, taking the difference value between the rated service life and the used service life of the energy storage subsystem as the residual service life of the energy storage subsystem.
Optionally, the acquiring the service life of each energy storage subsystem in the energy storage system includes:
respectively acquiring preset index data of each energy storage subsystem in the energy storage system;
wherein, the preset index data comprises: rated discharge amount, at least one historical discharge rate, accumulated discharge amount corresponding to each of the historical discharge rates, and relative lifetime corresponding to each of the historical discharge rates;
and respectively calculating the service lives of the energy storage subsystems according to the preset index data of the energy storage subsystems.
Optionally, the calculating the service life of each energy storage subsystem according to the preset index data of each energy storage subsystem includes:
substituting preset index data of each energy storage subsystem into the following formula respectively, and calculating to obtain the corresponding service life of each energy storage subsystem:
wherein l used Has been an energy storage subsystemThe service life is prolonged;
E ci for the historical discharge multiplying power c i Corresponding accumulated discharge amount;
c i the i-th historical discharge multiplying power in the k historical discharge multiplying powers is the i-th historical discharge multiplying power, and k is more than or equal to 1;
L ci for the historical discharge multiplying power c i Corresponding relative lifetimes;
e is the rated discharge capacity of the energy storage subsystem;
l is the rated life of the energy storage subsystem.
Optionally, the process of obtaining the relative lifetime corresponding to any one of the historical discharge rates includes:
calling a preset mapping relation, wherein the preset mapping relation records the corresponding relative service lives of the energy storage subsystem when the energy storage subsystem operates at different discharge multiplying powers;
and determining the relative service life corresponding to the historical discharge multiplying power according to the preset mapping relation.
Optionally, the determining the relative lifetime corresponding to the historical discharge rate according to the preset mapping relationship includes:
judging whether the discharge multiplying power recorded by the preset mapping relation comprises the historical discharge multiplying power or not;
if the discharge multiplying power recorded in the preset mapping relation comprises the historical discharge multiplying power, acquiring the relative service life corresponding to the historical discharge multiplying power recorded in the preset mapping relation;
and if the discharge multiplying power recorded by the preset mapping relation does not comprise the historical discharge multiplying power, carrying out interpolation calculation according to the preset mapping relation to obtain the relative service life corresponding to the historical discharge multiplying power.
Optionally, the initially distributing the total power to be distributed based on the remaining life and rated power of each energy storage subsystem to obtain an initial shared power of each energy storage subsystem, including:
determining the distribution proportion of each energy storage subsystem according to the residual life and rated power of each energy storage subsystem;
and aiming at each energy storage subsystem, taking the product of the distribution proportion corresponding to the energy storage subsystem and the total power to be distributed as the initial shared power of the energy storage subsystem.
Optionally, the determining the distribution ratio of each energy storage subsystem according to the remaining life and rated power of each energy storage subsystem includes:
respectively calculating a first distribution coefficient of each energy storage subsystem according to the residual service life of each energy storage subsystem;
respectively calculating a second distribution coefficient of each energy storage subsystem according to rated power of each energy storage subsystem;
and for each energy storage subsystem, taking the product of the first distribution coefficient and the second distribution coefficient of the energy storage subsystem as the distribution proportion of the energy storage subsystem.
Optionally, the calculating the first distribution coefficient of each energy storage subsystem according to the remaining life of each energy storage subsystem includes:
substituting the remaining service life of each energy storage subsystem into the following formula for each energy storage subsystem to obtain a first distribution coefficient of each energy storage subsystem:
wherein omega j A first distribution coefficient representing a jth energy storage subsystem;
l j representing the remaining lifetime of the jth energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
Optionally, the calculating the second distribution coefficient of each energy storage subsystem according to the rated power of each energy storage subsystem includes:
substituting rated power of each energy storage subsystem into the following formula for each energy storage subsystem to obtain a second distribution coefficient of each energy storage subsystem:
wherein lambda is j A second partition coefficient for the jth energy storage subsystem;
P j rated power for the jth energy storage subsystem;
P i rated power for the ith energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
Optionally, the adjusting the initial shared power of the first M energy storage subsystems to the corresponding rated power according to the order of the remaining life from large to small to obtain the final shared power of each energy storage subsystem includes:
calculating reallocation power according to the initial shared power and rated power of each energy storage subsystem;
and executing the following reassignment operation on each energy storage subsystem according to the sequence of the residual life from large to small until the reassignment power is distributed completely:
if the initial shared power of the energy storage subsystem is greater than or equal to the rated power of the energy storage subsystem, taking the rated power of the energy storage subsystem as the final shared power;
and if the initial shared power of the energy storage subsystem is smaller than the rated power of the energy storage subsystem, taking the rated power of the energy storage subsystem or the sum of the initial shared power and the reassigned power of the energy storage subsystem as the final shared power of the energy storage system.
Optionally, the step of taking the rated power of the energy storage subsystem or the sum of the initial shared power and the reallocated power of the energy storage subsystem as the final shared power of the energy storage system includes:
if the reallocated power is larger than the difference value between the initial shared power of the energy storage subsystem and the rated power of the energy storage subsystem, supplementing the final shared power of the energy storage subsystem to the rated power of the energy storage subsystem based on the reallocated power, and updating the reallocated power;
and if the reassigned power is smaller than or equal to the difference value between the initial sharing power of the energy storage subsystem and the rated power of the energy storage subsystem, taking the sum of the initial sharing power of the energy storage subsystem and the reassigned power as the final sharing power of the energy storage subsystem.
Optionally, the calculating the redistribution power according to the initial sharing power and the rated power of each energy storage subsystem includes:
calculating the difference value between the initial shared power of the target energy storage subsystem and the rated power of the target energy storage subsystem;
the target energy storage subsystem is an energy storage subsystem with initial shared power larger than rated power of the target energy storage subsystem;
and taking the sum of the differences as the reassigned power.
In a second aspect, the present application provides an energy storage system comprising: a plurality of energy storage subsystems and an EMS controller, wherein,
each energy storage subsystem is respectively connected with the EMS controller in a communication way;
the EMS controller performs the energy storage system power distribution method according to any of the first aspects of the present application.
According to the power distribution method of the energy storage system, the power instruction comprising the total power to be distributed is responded, the residual service life and rated power of each energy storage subsystem in the energy storage system are obtained, the total power to be distributed is distributed based on the residual service life and rated power of each energy storage subsystem, the energy storage subsystem with the larger residual service life in the energy storage system shares the total power to be distributed with full load preferentially, and the shared power of each energy storage subsystem can be distributed to the corresponding energy storage subsystem after distribution. According to the method provided by the application, the residual service life and rated power of the energy storage subsystem are used as the basis for power distribution, so that the energy storage subsystem with large residual service life runs at full load preferentially, and more charge and discharge operations are performed, so that the residual service lives of all the energy storage subsystems in the energy storage system can be kept consistent, the complexity of integrally controlling the energy storage system is reduced, and the overall usability of the energy storage system is improved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for power distribution of an energy storage system according to an embodiment of the present application;
FIG. 2 is a flow chart of another method for power distribution of an energy storage system according to an embodiment of the present application;
fig. 3 is a flowchart of another power distribution method of an energy storage system according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The power distribution method of the energy storage system is applied to the energy storage system and is used for controlling the power specifically shared by all the energy storage subsystems included in the energy storage system. Specifically, the power distribution method of the energy storage system provided by the following embodiments of the present application can be applied to an EMS controller of the energy storage system. Of course, the method can also be applied to other controllers in the energy storage system, which can control the sharing power of each energy storage subsystem, and in some cases, the method can also be applied to a server on the network side.
Referring to fig. 1, fig. 1 is a flowchart of a power distribution method of an energy storage system according to an embodiment of the present application, where the power distribution method provided in the embodiment may include:
s100, acquiring a power instruction comprising the total power to be distributed.
In practical application, the specific working process of the energy storage system is controlled, and the energy management system adjusts the working mode of the energy storage system according to the running condition of the power grid and the power consumption requirement of the load, namely, adjusts the energy storage system to be in a charging mode or in a discharging mode. Therefore, the power to be distributed in the embodiments of the present application and the embodiments described in the following may be output power corresponding to the energy storage system, or input power corresponding to the energy storage system, where the energy management system may send a power instruction to the energy storage system, where the power instruction includes the total power to be distributed specifically to each energy storage subsystem.
S110, responding to the power instruction, and acquiring the residual service life and rated power of each energy storage subsystem in the energy storage system.
The service life of the energy storage system is mainly characterized by the charge and discharge times of the energy storage system, and in the application, the rated service life of the energy storage system can be understood as follows: under the conditions of standard temperature and 1C/1C charge and discharge, the capacity of the energy storage system is attenuated from 100% to 80% of equivalent charge and discharge times. The remaining life of the energy storage system refers to the number of remaining effective charge and discharge times associated with the use of the energy storage system.
It should be noted that the energy storage system often includes a plurality of energy storage subsystems, according to the time when the energy storage subsystem is connected to the energy storage system, the energy storage system in the energy storage system can be roughly divided into two main types, one is that the energy storage subsystem is directly connected to the current energy storage system after being built, and for the energy storage subsystem, the rated service life of the energy storage subsystem can be obtained through the specification of the energy storage subsystem; secondly, the energy storage subsystem is operated for a period of time after the construction is finished, and then the current energy storage system is accessed, namely, the energy storage subsystem belongs to a secondary energy storage subsystem for the current energy storage system, and the service life of the energy storage subsystem under the standard working condition is inevitably different from the rated life of the energy storage subsystem when leaving a factory. Therefore, it should be emphasized that, for the second type of energy storage subsystem, the rated service life refers to the service life of the energy storage subsystem under the standard working condition when the second type of energy storage subsystem is connected to the current energy storage system, and of course, the rated service life of the second type of energy storage subsystem cannot be obtained by searching the specification, and can be obtained by adopting a conversion method in the prior art. In the following, the definition of the rated lifetime of the energy storage system is according to the description herein, and will not be described in detail.
The rated power of the energy storage subsystem can be directly obtained through the specification of the system when leaving the factory, and the rated power is not unfolded.
Based on the foregoing, an alternative procedure for obtaining the remaining life of each energy storage subsystem within an energy storage system is described below:
firstly, respectively acquiring preset index data of each energy storage subsystem in the energy storage system. In this embodiment, the selection of the preset index data of the energy storage subsystem is prepared for calculating the service life of the energy storage subsystem, and specifically may include a rated discharge amount, at least one historical discharge rate, an accumulated discharge amount corresponding to each historical discharge rate, and a relative service life corresponding to each historical discharge rate.
It should be noted that, in combination with the above definition of the rated life, for the energy storage system in the prior art, the service life is directly related to the discharge rate in a specific operation process, different discharge rates correspond to different service lives, and for convenience of description, the service life corresponding to the operation of the energy storage system with different discharge rates is defined as the relative life in this embodiment. It is conceivable that when the relative lifetime of the energy storage system at the standard temperature, 1C/1C, i.e. the rated lifetime of the energy storage system, that is, in the embodiment of the present application, if the relative lifetimes corresponding to different historic discharge rates of any energy storage subsystem are combined into a set, the rated lifetime of the energy storage system may be included in the set of relative lifetimes.
Optionally, in order to facilitate determining the relative lives of the energy storage subsystems corresponding to different historical discharge rates, the embodiment of the application provides a preset mapping relation, wherein the preset mapping relation records the relative lives of the energy storage subsystems corresponding to different discharge rates. The establishment of the preset mapping relation can be completed based on the specification provided by the energy storage subsystem provider, of course, more historical discharge multiplying power and corresponding relative service life can be obtained by adopting a test or calculation means based on the specification, so that the preset mapping relation comprising more corresponding relations is established, and the execution efficiency of the method provided by the embodiment is improved.
It is conceivable that, since a discrete historical discharge rate is often described in the preset map, there is a possibility that the current historical discharge rate to be calculated is not recorded in the preset map, and thus, different processes are required in connection with this case.
Based on the above, the process of determining the relative lifetime corresponding to any one of the historical discharge magnifications may be further developed as:
after a preset mapping relation is called, judging whether the discharge multiplying power recorded in the preset mapping relation comprises the historical discharge multiplying power, and if the discharge multiplying power recorded in the preset mapping relation comprises the historical discharge multiplying power, directly acquiring the relative service life corresponding to the historical discharge multiplying power recorded in the preset mapping relation; in contrast, if the discharge rate recorded by the preset mapping relation does not include the historical discharge rate, interpolation calculation is needed according to the preset mapping relation, so that the relative service life corresponding to the historical discharge rate is obtained.
It should be noted that, for a specific implementation method of interpolation calculation, the implementation may be implemented with reference to the prior art, which is not limited by the present application. In addition, the preset index data, such as the rated discharge amount and the historical discharge amount, which are not developed in the present embodiment, may be obtained by referring to the prior art, and will not be described in detail herein.
After the preset index data are obtained, the service lives of the energy storage subsystems can be calculated according to the preset index data corresponding to the energy storage subsystems.
Specifically, for each energy storage subsystem, substituting preset index data of the energy storage subsystem into the following formula to calculate the service life corresponding to the energy storage subsystem:
wherein l used Is the service life of the energy storage subsystem;
E ci for the historical discharge multiplying power c i Corresponding accumulated discharge amount;
c i the i-th historical discharge multiplying power in the k historical discharge multiplying powers is the i-th historical discharge multiplying power, and k is more than or equal to 1;
L ci for the historical discharge multiplying power c i Corresponding relative lifetimes;
e is the rated discharge capacity of the energy storage subsystem;
l is the rated life of the energy storage subsystem.
Through the steps, the service life and the rated service life of each energy storage subsystem in the energy storage system are determined, and then the difference value between the rated service life and the service life of each energy storage subsystem can be used as the residual service life of the energy storage subsystem.
In particular, the set of used lifetimes for each energy storage subsystem may be represented as [ l ] used_1 ,l used_2 ,…,l used_n ]Rated life of each energy storage subsystem is [ L ] 1 ,L 2 ,…,L n ]The remaining lifetime of each energy storage subsystem may be calculated as follows:
l j ＝L j -l used_j
where j=1, 2, … n, n is the number of energy storage subsystems within the energy storage system;
L j is the rated life of the jth energy storage subsystem.
l j Remaining life for the jth energy storage subsystem;
finally, the set of remaining life of each energy storage subsystem is [ l ] 1 ,l 2 ,…,l n ]. As can be seen from the above calculation, the calculated service life and remaining life of the respective energy storage subsystem correspond to the service life and remaining life at the rated discharge rateAnd (5) a life.
And S120, distributing the total power to be distributed based on the residual service life and rated power of each energy storage subsystem, and preferentially sharing the total power to be distributed by full load of the energy storage subsystem with the larger residual service life in the energy storage system.
According to the power distribution method provided by the embodiment of the application, when the total power to be distributed is distributed, the distribution process is realized based on the rated power and the residual service life of the energy storage subsystem, the distribution result can ensure that the energy storage subsystem with the large residual service life in the energy storage system shares more power and bears more charge and discharge operations, and correspondingly, the energy storage subsystem with the small residual service life preferentially shares the total power to be distributed by underload, namely bears relatively less charge and discharge operations, so that balance of the residual service life is realized.
S130, distributing the sharing power of each energy storage subsystem to the corresponding energy storage subsystem.
After the final sharing power of each energy storage subsystem is obtained, the final sharing power corresponding to each energy storage subsystem can be issued to the corresponding energy storage subsystem.
In summary, the method provided by the application uses the residual service life and rated power of the energy storage subsystem as the basis of power distribution, so that the energy storage subsystem with large residual service life runs preferentially at full load to perform more charge and discharge operations, and the energy storage subsystem with small residual service life shares the total power to be distributed preferentially at underload, namely bears relatively less charge and discharge operations, so that the residual service lives of all the energy storage subsystems in the energy storage system can be balanced, the complexity of integrally controlling the energy storage system is reduced on the premise of not influencing the response of external power instructions, and the overall usability of the energy storage system is improved.
Optionally, referring to fig. 2, fig. 2 is another power distribution method of an energy storage system according to an embodiment of the present application, and based on the embodiment shown in fig. 1, a more specific power distribution method is provided in this embodiment, and a flow of the method includes:
s200, acquiring a power instruction comprising the total power to be distributed.
Alternatively, S200 may be implemented with reference to S100 in the embodiment shown in fig. 1, which is not described herein.
S210, responding to the power instruction, and acquiring the residual service life and rated power of each energy storage subsystem in the energy storage system.
Alternatively, S210 may be implemented with reference to S110 in the embodiment shown in fig. 1, which is not described herein.
S220, based on the remaining service life and rated power of each energy storage subsystem, the total power to be distributed is initially distributed, and initial sharing power of each energy storage subsystem is obtained.
Optionally, in the process of performing the foregoing initial allocation, the allocation proportion of each energy storage subsystem is determined respectively according to the remaining life and the rated power of each energy storage subsystem.
Specifically, according to the remaining service life of each energy storage subsystem, a first distribution coefficient of each energy storage subsystem is calculated respectively. Substituting the remaining service life of each energy storage subsystem into the following formula aiming at each energy storage subsystem to obtain a first distribution coefficient of each energy storage subsystem:
wherein omega j A first distribution coefficient representing a jth energy storage subsystem;
l j representing the remaining lifetime of the jth energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
According to the rated power of each energy storage subsystem, respectively calculating a second distribution coefficient of each energy storage subsystem, and substituting the rated power of each energy storage subsystem into the following formula for each energy storage subsystem to obtain the second distribution coefficient of each energy storage subsystem:
wherein lambda is j A second partition coefficient for the jth energy storage subsystem;
P j rated power for the jth energy storage subsystem;
P i rated power for the ith energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
Finally, for each energy storage subsystem, the product of the first distribution coefficient and the second distribution coefficient of the energy storage subsystem is used as the distribution proportion of the energy storage subsystem.
After the distribution proportion of each energy storage subsystem is obtained, the distribution proportion corresponding to the energy storage subsystem is multiplied by the total power to be distributed, and the obtained product is the initial shared power of the energy storage subsystem.
And S230, re-distributing the initial shared power of the first M energy storage subsystems according to the sequence from the large to the small of the residual life, and adjusting the initial shared power of the first M energy storage subsystems to the corresponding rated power to obtain the final shared power of each energy storage subsystem.
It is conceivable that, in order to ensure the normal operation of each energy storage system, the final shared power of any energy storage subsystem in the energy storage system is not greater than the respective rated power, and the sum of the final shared powers of the energy storage subsystems is the total power to be distributed, that is, it should be ensured that the total power to be distributed is distributed. Of course, M is 1 or more.
Based on the principle, the process of carrying out secondary distribution on the initial shared power of each energy storage subsystem comprises the following steps:
first, a reallocated power is calculated based on the initial shared power and the rated power of each energy storage subsystem. Specifically, the difference value between the initial shared power of the target energy storage subsystem and the rated power of the target energy storage subsystem is calculated, and the sum of the obtained difference values is further calculated, so that the reallocated power is obtained. The target energy storage subsystem is an energy storage subsystem with initial shared power larger than rated power of the target energy storage subsystem.
Assuming that after initial allocation, the initial shared power of each energy storage subsystem is denoted as [ p ] 1 ,p 2 ,…,p n ]The initial sharing power of each energy storage subsystem is compared with the rated power [ P ] corresponding to each energy storage subsystem 1 ,P 2 ,…,P n ]Proceeding withIn comparison, the initial power sharing greater than the rated power of the energy storage subsystem is not responsive, and the power that cannot be responded is the redistributed power described in this embodiment, denoted as P', and then there are:
wherein i represents an ith energy storage subsystem;
n represents the total number of energy storage subsystems in the energy storage system.
From the above calculation process, it can be seen that the redistribution power referred to in the present application can be understood as the sum of powers that the respective energy storage subsystem cannot respond to after the first distribution.
Secondly, according to the sequence of the residual service life from big to small, the following reassignment operation is executed for each energy storage subsystem until the reassignment of the power is finished:
and comparing the initial sharing power of the energy storage subsystem with the self rated power, and if the initial sharing power of the energy storage subsystem is greater than or equal to the self rated power, taking the rated power of the energy storage subsystem as the final sharing power, so that the energy storage subsystem can operate at full load preferentially through the operation.
If the initial shared power of the energy storage subsystem is smaller than the rated power of the energy storage subsystem, the rated power of the energy storage subsystem or the sum of the initial shared power and the reassigned power of the energy storage subsystem is used as the final shared power of the energy storage system.
For the case that the initial sharing power of the energy storage subsystem is smaller than the rated power of the energy storage subsystem, different processing modes are needed to be adopted in combination with the specific case of reallocating power. Specifically, if the reallocated power is greater than the difference between the initial shared power of the energy storage subsystem and the rated power of the energy storage subsystem, the final shared power of the energy storage subsystem is complemented to the rated power of the energy storage subsystem based on the reallocated power, and meanwhile, the reallocated power is updated, namely, the power divided into the energy storage subsystem is subtracted; correspondingly, if the reassigned power is smaller than or equal to the difference value between the initial sharing power of the energy storage subsystem and the rated power of the energy storage subsystem, taking the sum of the initial sharing power and the reassigned power of the energy storage subsystem as the final sharing power of the energy storage subsystem. It is conceivable that after the sum of the initial shared power and the reallocated power of the energy storage subsystem is used as the final shared power of the energy storage subsystem, the reallocated power is already allocated, and each energy storage subsystem before the energy storage subsystem operates at full load.
Following the previous example, after sorting the energy storage subsystems from large to small based on the remaining lifetime, then judging the initial shared power p of each energy storage subsystem one by one i If the power is larger than or equal to the rated power of the energy storage subsystem, the rated power of the energy storage subsystem is used as the final sharing power, the next energy storage subsystem is continuously judged, if the initial sharing power is smaller than the rated power of the energy storage subsystem, the reassigned power is not zero, if the reassigned power P' is larger than the power to be complemented, the final sharing power of the energy storage subsystem is adjusted to the rated power, and the remaining reassigned power is continuously distributed to the next energy storage subsystem until the distribution is finished.
S240, the final sharing power of each energy storage subsystem is issued to the corresponding energy storage subsystem.
After determining the final sharing power of each energy storage subsystem through the steps, the final sharing power can be issued to the corresponding energy storage subsystem.
In summary, based on the embodiment shown in fig. 1, the embodiment provides a more specific power distribution method, and the secondary distribution is used to realize that the energy storage subsystem with a large residual life runs preferably at full load, so as to perform more charge and discharge operations, and the energy storage subsystem with a small residual life preferably shares the total power to be distributed with underload, namely bears relatively less charge and discharge operations, so that the residual life of each energy storage subsystem in the energy storage system can be balanced, and on the premise of not influencing the response of external power instructions, the complexity of integrally controlling the energy storage system is reduced, and the overall usability of the energy storage system is improved.
As can be seen from the foregoing steps, when the initial allocation of the total power to be allocated is performed, the allocation process is implemented based on the rated power and the remaining life of the energy storage subsystem, so that it can be basically ensured that the energy storage subsystem with a large remaining life in the energy storage system shares more power, especially in the case that the total power to be allocated is not particularly large, after the initial allocation, there is a possibility that no power is reallocated, for this case, it is obvious that no subsequent execution process is required, and in order to improve the efficiency of power allocation, the embodiment of the present application provides another power allocation method of the energy storage system, referring to fig. 3, and on the basis of the embodiment shown in fig. 2, the power allocation method provided in this embodiment further includes, before S230:
s300, judging whether the initial shared power of any energy storage subsystem is larger than the rated power of the energy storage subsystem, and if so, executing S230; if not, S310 is performed.
If there is any energy storage subsystem with an initial power share greater than its rated power, that is, it indicates that there is indeed a reallocated power that needs to be allocated again, in this case, S230 is continued; in contrast, if the initial shared power of each energy storage subsystem is less than or equal to the rated power of the energy storage subsystem, which means that each energy storage subsystem operates with the shared power less than or equal to the rated power of the energy storage subsystem, S310 is executed.
And S310, taking each initial shared power as the final shared power of the corresponding energy storage subsystem.
If no power is redistributed, the initial shared power of each energy storage subsystem is used as the final shared power, and the step S240 is continued.
In summary, the power distribution method provided by the embodiment of the present application judges whether the redistributed power exists, so that the execution process of the distribution method can be simplified to a certain extent, and the efficiency of power distribution is improved.
Optionally, the present application further provides an energy storage system, including: a plurality of energy storage subsystems and an EMS controller, wherein,
each energy storage subsystem is respectively connected with the EMS controller in a communication way;
the EMS controller performs the energy storage system power allocation method provided in any of the above embodiments.
In the application, each embodiment is described in a progressive manner, and each embodiment is mainly used for illustrating the difference from other embodiments, and the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The above description is only of the preferred embodiment of the present application, and is not intended to limit the present application in any way. While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present application or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present application. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application still fall within the scope of the technical solution of the present application.
Claims (15)
1. A method for power distribution in an energy storage system, comprising:
acquiring a power instruction comprising the total power to be distributed;
responding to the power instruction, and acquiring the residual service life and rated power of each energy storage subsystem in the energy storage system;
based on the remaining service life and rated power of each energy storage subsystem, initially distributing the total power to be distributed to obtain initial shared power of each energy storage subsystem;
according to the sequence of the remaining life from large to small, the initial sharing power of the first M energy storage subsystems is adjusted to be corresponding rated power, and the final sharing power of each energy storage subsystem is obtained, wherein M is greater than or equal to 1;
issuing the sharing power of each energy storage subsystem to the corresponding energy storage subsystem;
the method comprises the steps of adjusting initial sharing power of the first M energy storage subsystems to corresponding rated power according to the sequence of the remaining life from large to small, and further comprises the following steps before final sharing power of each energy storage subsystem is obtained:
judging whether the initial shared power of any energy storage subsystem is larger than the rated power of the energy storage subsystem or not;
if any of the initial shared power of the energy storage subsystems is larger than the rated power of the energy storage subsystem, executing the steps of adjusting the initial shared power of the first M energy storage subsystems to the corresponding rated power according to the sequence from the large residual life to the small residual life to obtain the final shared power of each energy storage subsystem;
and if the initial shared power of each energy storage subsystem is smaller than or equal to the rated power of the energy storage subsystem, taking the initial shared power as the final shared power of the corresponding energy storage subsystem.
2. The energy storage system power distribution method of claim 1, wherein the final shared power of any of the energy storage subsystems within the energy storage system is no greater than the respective rated power.
3. The method of claim 1, wherein the obtaining remaining life of each energy storage subsystem in the energy storage system comprises:
acquiring the service life and rated service life of each energy storage subsystem in the energy storage system;
and regarding each energy storage subsystem, taking the difference value between the rated service life and the used service life of the energy storage subsystem as the residual service life of the energy storage subsystem.
4. The method of claim 3, wherein the obtaining the service life of each energy storage subsystem in the energy storage system comprises:
respectively acquiring preset index data of each energy storage subsystem in the energy storage system;
wherein, the preset index data comprises: rated discharge amount, at least one historical discharge rate, accumulated discharge amount corresponding to each of the historical discharge rates, and relative lifetime corresponding to each of the historical discharge rates;
and respectively calculating the service lives of the energy storage subsystems according to the preset index data of the energy storage subsystems.
5. The method of claim 4, wherein the calculating the service life of each energy storage subsystem according to the preset index data of each energy storage subsystem comprises:
substituting preset index data of each energy storage subsystem into the following formula respectively, and calculating to obtain the corresponding service life of each energy storage subsystem:
wherein l used Is the service life of the energy storage subsystem;
E ci for the historical discharge multiplying power c i Corresponding accumulated discharge amount;
c i the i-th historical discharge multiplying power in the k historical discharge multiplying powers is the i-th historical discharge multiplying power, and k is more than or equal to 1;
L ci for the historical discharge multiplying power c i Corresponding relative lifetimes;
e is the rated discharge capacity of the energy storage subsystem;
l is the rated life of the energy storage subsystem.
6. The method of claim 4, wherein the step of obtaining a relative lifetime corresponding to any of the historical discharge rates comprises:
calling a preset mapping relation, wherein the preset mapping relation records the corresponding relative service lives of the energy storage subsystem when the energy storage subsystem operates at different discharge multiplying powers;
and determining the relative service life corresponding to the historical discharge multiplying power according to the preset mapping relation.
7. The method of claim 6, wherein determining the relative lifetime corresponding to the historical discharge rate according to the preset mapping relationship comprises:
judging whether the discharge multiplying power recorded by the preset mapping relation comprises the historical discharge multiplying power or not;
if the discharge multiplying power recorded in the preset mapping relation comprises the historical discharge multiplying power, acquiring the relative service life corresponding to the historical discharge multiplying power recorded in the preset mapping relation;
and if the discharge multiplying power recorded by the preset mapping relation does not comprise the historical discharge multiplying power, carrying out interpolation calculation according to the preset mapping relation to obtain the relative service life corresponding to the historical discharge multiplying power.
8. The method for power distribution of an energy storage system according to claim 1, wherein said initially distributing the total power to be distributed based on the remaining lifetime and rated power of each energy storage subsystem to obtain an initial shared power of each energy storage subsystem, comprises:
determining the distribution proportion of each energy storage subsystem according to the residual life and rated power of each energy storage subsystem;
and aiming at each energy storage subsystem, taking the product of the distribution proportion corresponding to the energy storage subsystem and the total power to be distributed as the initial shared power of the energy storage subsystem.
9. The method of claim 8, wherein determining the distribution ratio of each energy storage subsystem according to the remaining lifetime and rated power of each energy storage subsystem comprises:
respectively calculating a first distribution coefficient of each energy storage subsystem according to the residual service life of each energy storage subsystem;
respectively calculating a second distribution coefficient of each energy storage subsystem according to rated power of each energy storage subsystem;
and for each energy storage subsystem, taking the product of the first distribution coefficient and the second distribution coefficient of the energy storage subsystem as the distribution proportion of the energy storage subsystem.
10. The method of claim 9, wherein calculating the first distribution coefficient of each energy storage subsystem according to the remaining lifetime of each energy storage subsystem comprises:
substituting the remaining service life of each energy storage subsystem into the following formula for each energy storage subsystem to obtain a first distribution coefficient of each energy storage subsystem:
wherein omega j A first distribution coefficient representing a jth energy storage subsystem;
l j representing the remaining lifetime of the jth energy storage subsystem;
l i representing the remaining lifetime of the ith energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
11. The method of claim 9, wherein calculating the second distribution coefficient of each energy storage subsystem according to the rated power of each energy storage subsystem comprises:
substituting rated power of each energy storage subsystem into the following formula for each energy storage subsystem to obtain a second distribution coefficient of each energy storage subsystem:
wherein lambda is j A second partition coefficient for the jth energy storage subsystem;
P j rated power for the jth energy storage subsystem;
P i rated power for the ith energy storage subsystem;
n is the total number of energy storage subsystems in the energy storage system.
12. The method for distributing power to an energy storage system according to claim 1, wherein said adjusting initial power shares of the first M energy storage subsystems to corresponding rated powers in order of a remaining lifetime from a larger lifetime to a smaller lifetime to obtain final power shares of the energy storage subsystems includes:
calculating reallocation power according to the initial shared power and rated power of each energy storage subsystem;
and executing the following reassignment operation on each energy storage subsystem according to the sequence of the residual life from large to small until the reassignment power is distributed completely:
if the initial shared power of the energy storage subsystem is greater than or equal to the rated power of the energy storage subsystem, taking the rated power of the energy storage subsystem as the final shared power;
and if the initial shared power of the energy storage subsystem is smaller than the rated power of the energy storage subsystem, taking the rated power of the energy storage subsystem or the sum of the initial shared power and the reassigned power of the energy storage subsystem as the final shared power of the energy storage system.
13. The method of claim 12, wherein said summing the rated power of the energy storage subsystem or the initial shared power of the energy storage subsystem and the reallocated power as the final shared power of the energy storage system comprises:
if the reallocated power is larger than the difference value between the initial shared power of the energy storage subsystem and the rated power of the energy storage subsystem, supplementing the final shared power of the energy storage subsystem to the rated power of the energy storage subsystem based on the reallocated power, and updating the reallocated power;
and if the reassigned power is smaller than or equal to the difference value between the initial sharing power of the energy storage subsystem and the rated power of the energy storage subsystem, taking the sum of the initial sharing power of the energy storage subsystem and the reassigned power as the final sharing power of the energy storage subsystem.
14. The energy storage system power distribution method of claim 12, wherein said calculating the redistributed power based on the initial shared power and the rated power of each of said energy storage subsystems comprises:
calculating the difference value between the initial shared power of the target energy storage subsystem and the rated power of the target energy storage subsystem;
the target energy storage subsystem is an energy storage subsystem with initial shared power larger than rated power of the target energy storage subsystem;
and taking the sum of the differences as the reassigned power.
15. An energy storage system, comprising: a plurality of energy storage subsystems and an EMS controller, wherein,
each energy storage subsystem is respectively connected with the EMS controller in a communication way;
the EMS controller performs the energy storage system power distribution method of any of claims 1 to 14.
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| CN110061565A (en) * | 2019-04-01 | 2019-07-26 | 国网新源张家口风光储示范电站有限公司 | A kind of energy storage charge/discharge capacity control system and method based on wind-driven generator |
| CN110311396A (en) * | 2019-07-30 | 2019-10-08 | 太原理工大学 | A kind of alternating current-direct current mixing micro-capacitance sensor hybrid energy-storing capacity configuration optimizing method |
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| CN109687485A (en) * | 2018-11-20 | 2019-04-26 | 厦门科华恒盛股份有限公司 | Power distribution method, system and the terminal device of energy-storage system |
| CN110061565A (en) * | 2019-04-01 | 2019-07-26 | 国网新源张家口风光储示范电站有限公司 | A kind of energy storage charge/discharge capacity control system and method based on wind-driven generator |
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