CN117220261A - Energy storage system and power supply method - Google Patents
Energy storage system and power supply method Download PDFInfo
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Abstract
The application discloses an energy storage system and a power supply method. The first power conversion module, the second power conversion module and the direct current bus which are positioned on different branches connected in parallel are utilized to achieve the effect of multi-level power supply through the battery cluster, the commercial power and the direct current bus respectively, and the problem that the control unit loses power supply due to the failure of single power supply equipment can be solved when the energy storage system is abnormal. Consider the situation where the control unit loses power due to a disconnection of mains supply, a disconnection of battery cluster power, or a fire action of the energy storage system (i.e., both battery cluster power and mains supply disconnected). And the direct current bus is adopted for power supply, so that the power supply reliability is improved, the manufacturing cost and the maintenance cost of the energy storage system are saved, and the problem of environmental adaptability of the uninterruptible power supply is solved.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to an energy storage system and a power supply method.
Background
The power supply of the energy storage system is a safety guarantee measure, and the reliability, usability and safety of the energy storage system can be guaranteed. For example, the main power supply fails, the system is overloaded, and the like, so that the system can take over in time, and accidents are avoided. Under the condition of sudden power failure, power supply can be started in a short time, and a stable power supply is provided for a control unit in the energy storage system so as to meet the communication operation requirement after the system is powered off. In actual operation, once the power supply unit fails, the control unit loses power, so that the energy storage system is in a black box state, and monitoring, communication and other equipment cannot operate.
In the prior art, a certain power supply device is generally used for supplying power to an energy storage system, such as a battery cluster, an uninterruptible power supply and the like. However, when the electric quantity of the battery cluster is too low, the battery cluster is over-discharged due to the adoption of the battery cluster for power supply, and the service life of the battery cluster is influenced. And the corresponding uninterrupted power supply is configured in each different module of the control unit, so that the occupied space is increased, and the cost is increased. Thus, there is an urgent need for a reliable and low cost method to power control units in energy storage systems.
Disclosure of Invention
Based on the above problems, the present application provides an energy storage system and a power supply method for reliably and at low cost supplying power to a control unit in the energy storage system.
The application discloses an energy storage system, which is used for supplying power to a control unit in the energy storage system, wherein the control unit comprises a first unit, and the energy storage system comprises: the power supply system comprises a first power conversion module, a second power conversion module and a direct current bus;
the access end of the direct current bus, the first power conversion module, the second power conversion module and the first unit are respectively positioned on different branches which are mutually connected in parallel and are connected with the first unit;
the first power conversion module is also connected with a battery cluster;
the second power conversion module is connected to the mains supply.
Optionally, the energy storage system further comprises a first diode; the different branches comprise a first branch, a second branch and a third branch;
the first branch comprises the battery cluster positioned at the input end of the first power conversion module and the first power conversion module;
the second branch comprises a mains supply end positioned at the input end of the second power conversion module, the second power conversion module and the first diode positioned at the output end of the second power conversion module;
the third branch comprises a direct current bus positioned at the access end of the direct current bus and the access end of the direct current bus.
Optionally, the output end of the first power conversion module and the cathode of the first diode are commonly connected with a first node;
the first node is also connected to the direct current bus.
Optionally, the first node is configured to transfer the power provided by the first target branch to the first unit; and the first target branch circuit provides the branch circuit with the largest electric power for the first branch circuit, the second branch circuit and the third branch circuit.
Optionally, the energy storage system further includes: a load switch, a first circuit breaker and a second circuit breaker;
the load switch is positioned on the first branch, one end of the load switch is connected with the battery cluster, and the other end of the load switch is connected with the input end of the first power conversion module;
the first circuit breaker is positioned in the second branch circuit, one end of the first circuit breaker is connected with the mains supply, and the other end of the first circuit breaker is connected with the input end of the second power conversion module;
the second circuit breaker is located the third branch road, the one end of second circuit breaker is connected the access terminal of direct current generating line, the other end is connected the first node.
Optionally, the first power conversion module, the second power conversion module, the first diode, the load switch, the first circuit breaker and the second circuit breaker are all located in a battery box in the energy storage system.
Optionally, the first unit includes a battery cluster management unit; the battery cluster management unit is used for controlling the output voltage of the first power conversion module.
Optionally, the control unit includes a second unit, and the energy storage system further includes: a third power conversion module, a second diode, a third circuit breaker, and a fourth circuit breaker;
the third circuit breaker, the third power conversion module and the second diode are connected in series to form a fourth branch; the third circuit breaker is connected with a mains supply;
the access end of the direct current bus and the fourth circuit breaker are connected in series to form a fifth branch;
one end of the fourth circuit breaker is connected with the cathode of the second diode together to form a second node, and the other end of the fourth circuit breaker is connected with the access end of the direct current bus;
the fourth branch and the fifth branch are both connected with the second unit.
Optionally, the second node is configured to transfer the power provided by the second target branch to the second unit; and the second target branch circuit provides the branch circuit with the largest power for the fourth branch circuit and the fifth branch circuit.
Optionally, the third power conversion module, the second diode, the third circuit breaker and the fourth circuit breaker are located in an EMS cabinet.
Optionally, the second unit includes an EMS unit; the EMS unit is used to control or monitor the battery cluster management unit.
Based on the energy storage system, the application also discloses a power supply method which is applied to the energy storage system and comprises the following steps:
controlling the first voltage value output by the first power conversion module to be smaller than the second voltage value output by the second power conversion module;
according to the relative magnitudes of the first voltage value and the second voltage value, a mains supply end corresponding to the second voltage value supplies mains supply to the first unit through the second power conversion module;
when the energy storage system is disconnected with the mains supply end, the battery cluster corresponding to the first voltage value supplies power for the first unit according to the relative magnitude of the first voltage value and a third voltage value output by the access end of the direct current bus;
when the energy storage system is disconnected with the mains supply end and the battery cluster, the first unit is powered by the access end of the direct current bus corresponding to the third voltage value.
Optionally, the control unit includes a second unit, and the energy storage system further includes: a third power conversion module, a second diode, a third circuit breaker, and a fourth circuit breaker; the third circuit breaker, the third power conversion module and the second diode are connected in series to form a fourth branch; the third circuit breaker is connected with a mains supply; the access end of the direct current bus and the fourth circuit breaker are connected in series to form a fifth branch; one end of the fourth circuit breaker is connected with the cathode of the second diode together to form a second node, and the other end of the fourth circuit breaker is connected with the access end of the direct current bus; the fourth branch and the fifth branch are connected with the second unit; the second node is used for transmitting the power provided by the second target branch to the second unit; the second target branch circuit provides the branch circuit with the largest power for the fourth branch circuit and the fifth branch circuit;
the method further comprises the steps of:
and when the energy storage system is disconnected from the mains supply end, the second unit is powered by the access end of the direct current bus according to the third voltage value.
The application discloses an energy storage system and a power supply method. The first power conversion module, the second power conversion module and the direct current bus which are positioned on different branches connected in parallel are utilized to achieve the effect of multi-level power supply through the battery cluster, the commercial power and the direct current bus respectively, and the problem that the control unit loses power supply due to the failure of single power supply equipment can be solved when the energy storage system is abnormal. Consider the situation where the control unit loses power due to a disconnection of mains supply, a disconnection of battery cluster power, or a fire action of the energy storage system (i.e., both battery cluster power and mains supply disconnected). And the direct current bus is adopted for power supply, so that the power supply reliability is improved, the manufacturing cost and the maintenance cost of the energy storage system are saved, and the problem of environmental adaptability of the uninterruptible power supply is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1a is a schematic diagram of an energy storage system according to an embodiment of the present application;
FIG. 1b is a schematic diagram illustrating a detailed structure of an energy storage system according to an embodiment of the present application;
fig. 1c is a schematic power supply diagram of a battery box control unit according to an embodiment of the present application;
fig. 1d is a schematic power supply diagram of another battery box control unit according to an embodiment of the present application;
fig. 1e is a schematic power supply diagram of a battery box control unit according to another embodiment of the present application;
FIG. 2 is a schematic flow chart of a power supply method according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another energy storage system according to an embodiment of the present application.
Detailed Description
The energy storage system and the power supply method are suitable for a power supply scene of the energy storage system, and the energy storage system comprises a battery box and an energy management system EMS cabinet. Wherein, the control unit that needs the power supply includes: a battery cluster management system, a battery management system, a fire exhaust system and the like in the battery box, and also comprises an EMS unit and the like in the EMS cabinet. The battery box is also internally provided with a battery cluster which can be used as a power supply. The DC bus refers to a DC power supply in an AC input circuit. The commercial power is industrial frequency alternating current, and is an electric power resource extracted from a power grid.
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 application discloses an energy storage system. Referring specifically to fig. 1, an energy storage system disclosed in this embodiment includes: a first power conversion module 101, a second power conversion module, and a dc bus 103.
Wherein the access end of the dc bus 103, the first power conversion module 101, the second power conversion module 102 and the dc bus are respectively located on different parallel branches, and are all connected with the first unit CU 1 Are connected. The first power conversion module 101 is also connected to a battery cluster RACK. The second power conversion module 102 is connected to the mains AC. The direct current buses are connected in a head-tail annular mode, and therefore power supply reliability is guaranteed. A fuse may also be connected between RACK and the first power conversion module 101 to prevent the current from exceeding a prescribed value.
Fig. 1b is a detailed structural diagram of an energy storage system disclosed in this embodiment, where the energy storage system in this embodiment may be specifically shown in fig. 1 b:
the first branch comprises RACK at the input of the first power conversion module 101, and the first power conversion module 101. The second branch includes an AC supply terminal at the input of the second power conversion module 102, and a first diode D at the output of the second power conversion module 102 1 . The third branch comprises a dc bus 103 and an access terminal of the dc bus 103.
In the energy storage system according to the embodiment, the control unit includes a first unit CU 1 . An output terminal of the first power conversion module 101 and a first diode D 1 Is commonly connected with the first node P 1 First node P 1 A dc bus 103 is also connected. First node P 1 For receiving power from the first or second branch and delivering the received power to the first unit CU 1 To be the first unit CU 1 And (5) supplying power. Specifically, the first node P 1 Transferring the power provided by the first target branch to the first unit CU 1 . First target branchThe circuit provides the largest power among the first circuit, the second circuit and the third circuit.
In the energy storage system according to this embodiment, the energy storage system further includes a load switch QS and a first circuit breaker Q 1 And a second circuit breaker Q 2 . The load switch QS is located in the first branch, one end of the load switch QS is connected to RACK, and the other end of the load switch QS is connected to the input end of the first power conversion module 101. First circuit breaker Q 1 Located in the second branch, the first circuit breaker Q 1 The other end of which is connected to the input of the second power conversion module 101. Second circuit breaker Q 2 Located in the third branch, the second circuit breaker Q 2 One end of the (a) is connected with the access end of the DC bus 103, and the other end is connected with the first node P 1 。
Wherein the second circuit breaker Q 2 Can prevent the influence on the DC bus when the single battery box has short-circuit fault, specifically, the second breaker Q in the fault battery box is opened 2， The fault battery box can be disconnected from the dc bus.
Wherein, the first power conversion module 101, the second power conversion module 102, the first diode D 1 Load switch QS, first circuit breaker Q 1 And a second circuit breaker Q 2 Are all positioned in a battery box in the energy storage system.
In the energy storage system according to the present embodiment, the first unit may include a battery cluster management unit for controlling the output voltage of the first power conversion module 101.
Fig. 1c is a schematic power supply diagram of a battery box control unit according to an embodiment of the present application, where the power supply scheme is directed at a situation that an energy storage system works normally, and at this time, a load switch QS and a first circuit breaker Q 1 And a second circuit breaker Q 2 Are closed and are therefore not labeled in fig. 1 c. As shown in fig. 1 c:
as can be seen from the above energy storage system, the power of the first branch where the first power conversion module 101 is located is provided by the battery cluster, the power of the second branch where the second power conversion module 102 is located is provided by the mains supply terminal, and the power of the third branch where the dc bus 103 is connected to the terminal is provided by the dc bus 103.
Because the power voltage value of the second branch is greater than the power voltage value of the first branch, the first power conversion module 101 and the first diode D 1 After being connected in parallel to form a combined branch, the output power is the power of the second branch. And because the power voltage value of the second branch is larger than that of the third branch, the power output after the combined branch and the third branch are connected in parallel is the power of the second branch. Finally, the electric power (commercial power) of the second branch is the first unit C 1 And (5) supplying power.
Fig. 1d is a schematic power supply diagram of another battery box control unit according to an embodiment of the present application, where the power supply scheme is directed to a case where the energy storage system is disconnected from the mains supply, and the load switch QS and the first circuit breaker Q are connected to the power supply 1 And a second circuit breaker Q 2 Are closed and are therefore not labeled in fig. 1 d. As shown in fig. 1 d:
the second branch where the second power conversion module 102 is located is disconnected along with the disconnection of the mains supply. First power conversion module 101 and first diode D 1 After being connected in parallel to form a combined branch, the output power is the power of the first branch. Because the power voltage value of the first branch is larger than that of the third branch, the power output after the combined branch and the third branch are connected in parallel is the power of the first branch. Finally, the electric power (battery cluster) of the first branch is used as a first unit C 1 And (5) supplying power.
Fig. 1e is a schematic diagram of a power supply of a battery box control unit according to an embodiment of the present application, where the power supply scheme is for a case when an energy storage system is disconnected from a mains supply and from a battery cluster, and the second circuit breaker Q 2 Closed, and therefore are not labeled in fig. 1 e. As shown in fig. 1 e:
because of the receipt of the fire alarm signal, the load switch QS and the first circuit breaker Q need to be turned off 1 To disconnect the power supply apparatus from the battery cluster and the utility supply terminal and stop the operation of the first power conversion module 101. At this time, the power (DC bus 103) from the third branch is the first unit C 1 And (5) supplying power.
In the energy storage system of the present embodiment, as an implementation scheme, for exampleFig. 1b shows: the control unit further includes a second unit in the EMS cabinet. The energy storage system according to this embodiment further includes: third power conversion module 104, second diode D 2 Third circuit breaker Q 3 And a fourth circuit breaker Q 4 。
Third circuit breaker Q 3 Third power conversion module 104, second diode D 2 The series connection is a fourth branch circuit, and a third circuit breaker Q 3 And accessing the AC. Access terminal of dc bus 103 and fourth circuit breaker Q 4 The fifth branch is connected in series. Fourth circuit breaker Q 4 One end of (D) is connected with a second diode D 2 Is commonly connected with the second node P 2 Fourth circuit breaker Q 4 The other end of which is connected to the access terminal of the dc bus 103.
The fourth branch and the fifth branch are both connected with the second unit CU 2 And (5) connection. Second node P 2 For transferring the power provided by the fourth branch or the fifth branch to the second unit CU 2 . Specifically, the second node P 2 Transferring the power provided by the second target branch to the second unit CU 2 . The second target branch is the branch with the largest power supply in the fourth branch and the fifth branch.
Wherein the third power conversion module, the second diode D 2 Third circuit breaker Q 3 And a fourth circuit breaker Q 4 Is positioned in the EMS cabinet.
In the energy storage system according to the present embodiment, the second unit CU 2 An EMS unit for controlling or monitoring the battery cluster management unit may be included.
In addition, when the energy storage system is operating normally, the third circuit breaker Q 3 And a fourth circuit breaker Q 4 Are all closed. As can be seen from the above energy storage system, the power of the fourth branch where the third power conversion module 104 is located is provided by the utility power, and the fourth circuit breaker Q 4 The power of the fifth branch where it is located is provided by the dc bus 103.
Because the power voltage value of the fourth branch is larger than that of the fifth branch, the power output after the fourth branch and the fifth branch are connected in parallel is the power of the fourth branch. Finally by the power of the fourth branch (cityElectricity) as the second unit C 2 And (5) supplying power.
When the energy storage system is disconnected with the mains supply end, the third circuit breaker Q 3 And a fourth circuit breaker Q 4 Are all closed. At this time, the electric power (DC bus 103) from the fifth branch is the second unit C 2 And (5) supplying power.
The system of the embodiment utilizes the first power conversion module, the second power conversion module and the direct current bus which are positioned on different branches connected in parallel, achieves the effect of multi-level power supply through the battery cluster, the mains supply and the direct current bus respectively, and can solve the problem that the control unit loses power supply due to the failure of single power supply equipment when the energy storage system is abnormal. Consider the situation where the control unit loses power due to a disconnection of mains supply, a disconnection of battery cluster power, or a fire action of the energy storage system (i.e., both battery cluster power and mains supply disconnected). And the direct current bus is adopted for power supply, so that the power supply reliability is improved, the manufacturing cost and the maintenance cost of the energy storage system are saved, and the problem of environmental adaptability of the uninterruptible power supply is solved.
Embodiment one: based on the energy storage system disclosed in the above embodiment, the present embodiment correspondingly discloses a power supply method, which is applied to the energy storage system of the present application. Specifically, referring to fig. 2, the steps of the power supply method disclosed in the embodiment include:
step 201: and controlling the first voltage value output by the first power conversion module to be smaller than the second voltage value output by the second power conversion module.
In the method of this embodiment, in the energy storage system, the battery cluster at the input end of the first power conversion module and the first power conversion module are connected in series to form a first branch. The mains supply end of the input end of the second power conversion module, the second power conversion module and the first diode of the output end of the second power conversion module are connected in series to form a second branch. The direct current bus and the access end of the direct current bus are connected in series to form a third branch. The first branch and the second branch are connected in parallel and are converged into a combined branch.
In the method of the present embodiment, this step serves as an initialization for an energy storage system of the present application. In the system described in this embodiment, the power and the voltage of the first power conversion module may be set by the EMS issuing an instruction to control the battery management controller in the battery box, or may be set by the battery management controller in the battery box issuing an instruction, where the EMS monitors only as data.
As an alternative method, the voltage value of the combining branch is obtained by: the voltage of the first branch where the first power conversion module is located is compared with the voltage of the second branch where the second power conversion module is located, that is, the first voltage value is compared with the second voltage value, and the larger voltage value is selected as the voltage value of the combined branch.
The voltage value of the parallel connection of the combined branch and the third branch is obtained through the following steps: the voltage of the third branch circuit is compared with the voltage of the combined branch circuit, namely the third voltage value is compared with the voltage value of the combined branch circuit, and the larger voltage value is selected as the voltage value output after the combined branch circuit and the third branch circuit are connected in parallel.
Step 202: and according to the relative magnitudes of the first voltage value and the second voltage value, a mains supply end corresponding to the second voltage value supplies mains supply to the first unit through the second power conversion module.
In the method of the present embodiment, as shown in fig. 1 c: the first voltage value is smaller than the second voltage value, so that the voltage value output after the first branch circuit and the second branch circuit are connected is the second voltage value. The second voltage value is larger than the third voltage value, so that the voltage value output after the combined branch and the third branch are connected in parallel is the second voltage value. The first unit is finally powered by the second voltage value (mains).
Step 203: when the energy storage system is disconnected with the mains supply end, the battery cluster corresponding to the first voltage value supplies power for the first unit according to the relative magnitude of the first voltage value and a third voltage value output by the access end of the direct current bus.
In the method of this embodiment, the energy storage system is disconnected from the mains supply, and the voltage of the mains supply, i.e. the second voltage value, is 0, as shown in fig. 1 d: the first voltage value is larger than the second voltage value, so that the voltage value output after the first branch circuit and the second branch circuit are connected in parallel is the first voltage value. The first voltage value is larger than the third voltage value, so that the voltage value output after the combined branch and the third branch are connected in parallel is the first voltage value. The first element is finally powered by a first voltage value (battery cluster).
Step 204: when the energy storage system is disconnected with the mains supply end and the battery cluster, the first unit is powered by the access end of the direct current bus corresponding to the third voltage value.
In the method of the present embodiment, when the energy storage system is disconnected from the mains supply terminal and the energy storage system is disconnected from the battery cluster, as shown in fig. 1 e: the voltage of the mains supply end, namely the second voltage value is 0, and the voltage of the battery cluster, namely the first voltage value is 0. And according to the third voltage value, the first unit is powered by the direct current bus.
In the method of this embodiment, as an alternative method, in the energy storage system, the mains supply end of the input end of the third power conversion module, and the second diode of the output end of the third power conversion module are connected in series to form a fourth branch. The direct current bus and the access end of the direct current bus are connected in series to form a fifth branch.
When the energy storage system works normally, because the power voltage value of the fourth branch is larger than that of the fifth branch, the power output after the fourth branch and the fifth branch are connected in parallel is the power of the fourth branch. The second unit is finally powered by the power of the fourth branch (mains). When the energy storage system is disconnected from the mains supply end, the second unit is powered by the power (direct current bus) of the fifth branch.
According to the method, the control unit is powered by the mains supply preferentially through multi-level power supply, and the energy storage system can be automatically switched to use the battery cluster or the direct current bus to supply power to the system when the energy storage system is abnormal. The problem of the control unit losing power due to a failure of a single power supply device can be solved. Consider the situation where a control unit in the energy storage system loses power due to a disconnection of mains supply, a disconnection of the battery cluster power supply, or a fire action of the energy storage system (i.e., both the battery cluster power supply and the mains supply are disconnected).
Fig. 3 is a detailed schematic diagram of another energy storage system according to an embodiment of the present application, which is directed to a case where a plurality of battery boxes are present in the energy storage system. Specifically, please refer to fig. 3:
in the battery box 1, RACK at the input end of the first power conversion module 101 and the first power conversion module 101 are connected in series as a first branch. An AC supply, a second power conversion module 102 and a first diode D at the output of the second power conversion module 102 1 The series connection is a second branch. The dc bus 103 and the dc bus 103 are connected in series to form a third branch. The first branch and the second branch are connected in parallel and are converged into a combined branch. In the battery box 2, the connection relationship of the respective circuit components is the same as that of the circuit box 1.
In the system according to the embodiment, when the battery box fails, the first power conversion module in the remaining normal battery box needs to output enough power to supply power to the failed battery box. Therefore, when the energy storage system is built, the failure rate of the battery box of the energy storage system needs to be estimated, namely, the probability that the first power conversion module cannot normally output power to the first unit of the battery box due to other reasons such as battery cluster failure, power shortage, failure of the first power conversion module and the like of the battery box.
As an achievable solution, the failure rate is P A The total power consumption of the first unit of each battery box is P 1 The auxiliary power of the EMS cabinet is P 2 . Consider when P A The first power conversion modules of the remaining battery boxes after the failure of the battery boxes need to output enough power to supply power for the failed battery boxes, and then the output power P of the single first power conversion module 3 Can be set as follows:
in addition, in order to ensure that the battery clusters can still provide uninterrupted power for all battery boxes for T hours after the discharge is completed, the required residual electric quantity Q can be set when the discharge of a single battery cluster is cut off 1 The method comprises the following steps:
therefore, after a part of battery boxes are failed, the power output by the remaining normal battery boxes is enough to provide power for the failed battery boxes, and the control unit in the energy storage system cannot lose power supply.
For example, in the energy storage system of the present application, there are n battery boxes, when the mains supply loses power, there are x battery boxes that fail themselves or the first power conversion module takes power to obtain the battery cluster with power, and x is the number of battery clusters<nP A When the operation of the first power conversion modules in the x battery boxes is stopped, the remaining n-x battery boxes provide auxiliary power for the n battery boxes, and the output power of each first power conversion module is set to be about (nP 1 +P 2 ) And (n-x). And restarting the operation of the first power conversion modules in the x battery boxes after the fault is recovered. In addition, when x>nP A When the x-nP needs to be disconnected A And a second breaker in the fault battery box so as not to influence the direct current bus.
The system in the embodiment supports the power supply of the control unit by adopting the electric quantity of the whole energy storage system, and solves the problem that the control unit loses power under the conditions of power loss of the electric supply of the single cell box and power loss of the single cell box
In the energy storage system of the present application, if the first power conversion module is bidirectional, when the battery cluster is deficient, the battery cluster can be charged by using the commercial power or the dc bus. The method specifically comprises the following steps:
if the second circuit breaker is opened, and no power is drawn from the dc bus, the first circuit breaker needs to be closed to draw power from the mains. At this time, since the initial power of the second power conversion module is greater than the output power of the first power conversion module, it is necessary to control the charging power of the first power conversion module to be the difference between the initial power of the second power conversion module and the output power of the first power conversion module.
If the first circuit breaker is opened, and power is not taken from the mains supply, the first circuit breaker needs to be closedThe second circuit breaker is used for taking electricity from the direct current bus. At this time, the charging power P of the first power conversion module is controlled C The method comprises the following steps:
P C ≤(n-1)P 3 -nP 1 -P 2 (3)
when the battery clusters are deficient, the system of the embodiment can utilize the bidirectional first power conversion module to take power from the direct current bus or the commercial power so as to supplement power for the battery clusters with the deficient power. And extra power supplementing equipment is not needed, so that the cost is saved, and meanwhile, the on-site power supplementing operation is more convenient.
The embodiments in this specification are described in a progressive manner. 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.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The features described in the embodiments of the present specification may be interchanged or combined to enable those skilled in the art to make or use the application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. An energy storage system for powering a control unit in the energy storage system, the control unit comprising a first unit, the energy storage system comprising: the power supply system comprises a first power conversion module, a second power conversion module and a direct current bus;
the access end of the direct current bus, the first power conversion module, the second power conversion module and the first unit are respectively positioned on different branches which are mutually connected in parallel and are connected with the first unit;
the first power conversion module is also connected with a battery cluster;
the second power conversion module is connected to the mains supply.
2. The energy storage system of claim 1, further comprising a first diode; the different branches comprise a first branch, a second branch and a third branch;
the first branch comprises the battery cluster positioned at the input end of the first power conversion module and the first power conversion module;
the second branch comprises a mains supply end positioned at the input end of the second power conversion module, the second power conversion module and the first diode positioned at the output end of the second power conversion module;
the third branch comprises a direct current bus positioned at the access end of the direct current bus and the access end of the direct current bus.
3. The energy storage system of claim 2, wherein the energy storage system comprises,
the output end of the first power conversion module and the cathode of the first diode are connected with a first node together;
the first node is also connected to the direct current bus.
4. The energy storage system of claim 3, wherein the first node is configured to transfer power provided by a first target leg to the first unit; and the first target branch circuit provides the branch circuit with the largest electric power for the first branch circuit, the second branch circuit and the third branch circuit.
5. The energy storage system of claim 3, further comprising: a load switch, a first circuit breaker and a second circuit breaker;
the load switch is positioned on the first branch, one end of the load switch is connected with the battery cluster, and the other end of the load switch is connected with the input end of the first power conversion module;
the first circuit breaker is positioned in the second branch circuit, one end of the first circuit breaker is connected with the mains supply, and the other end of the first circuit breaker is connected with the input end of the second power conversion module;
the second circuit breaker is located the third branch road, the one end of second circuit breaker is connected the access terminal of direct current generating line, the other end is connected the first node.
6. The energy storage system of any of claims 2-5, wherein the first power conversion module, the second power conversion module, the first diode, the load switch, the first circuit breaker, and the second circuit breaker are all located within a battery box in the energy storage system.
7. The energy storage system of claim 1, wherein the first unit comprises a battery cluster management unit; the battery cluster management unit is used for controlling the output voltage of the first power conversion module.
8. The energy storage system of claim 1, wherein the control unit comprises a second unit, the energy storage system further comprising: a third power conversion module, a second diode, a third circuit breaker, and a fourth circuit breaker;
the third circuit breaker, the third power conversion module and the second diode are connected in series to form a fourth branch; the third circuit breaker is connected with a mains supply;
the access end of the direct current bus and the fourth circuit breaker are connected in series to form a fifth branch;
one end of the fourth circuit breaker is connected with the cathode of the second diode together to form a second node, and the other end of the fourth circuit breaker is connected with the access end of the direct current bus;
the fourth branch and the fifth branch are both connected with the second unit.
9. The energy storage system of claim 8, wherein the second node is configured to transfer power provided by a second target leg to the second unit; and the second target branch circuit provides the branch circuit with the largest power for the fourth branch circuit and the fifth branch circuit.
10. The energy storage system of any of claims 8 and 9, wherein the third power conversion module, the second diode, a third circuit breaker, and a fourth circuit breaker are located within an EMS cabinet.
11. The energy storage system of claim 7, wherein the second unit comprises an EMS unit; the EMS unit is used to control or monitor the battery cluster management unit.
12. A power supply method applied to the energy storage system of any one of claims 1 to 7, the power supply method comprising:
controlling the first voltage value output by the first power conversion module to be smaller than the second voltage value output by the second power conversion module;
according to the relative magnitudes of the first voltage value and the second voltage value, a mains supply end corresponding to the second voltage value supplies mains supply to the first unit through the second power conversion module;
when the energy storage system is disconnected with the mains supply end, the battery cluster corresponding to the first voltage value supplies power for the first unit according to the relative magnitude of the first voltage value and a third voltage value output by the access end of the direct current bus;
when the energy storage system is disconnected with the mains supply end and the battery cluster, the first unit is powered by the access end of the direct current bus corresponding to the third voltage value.
13. The method of claim 12, wherein the control unit comprises a second unit, the energy storage system further comprising: a third power conversion module, a second diode, a third circuit breaker, and a fourth circuit breaker; the third circuit breaker, the third power conversion module and the second diode are connected in series to form a fourth branch; the third circuit breaker is connected with a mains supply; the access end of the direct current bus and the fourth circuit breaker are connected in series to form a fifth branch; one end of the fourth circuit breaker is connected with the cathode of the second diode together to form a second node, and the other end of the fourth circuit breaker is connected with the access end of the direct current bus; the fourth branch and the fifth branch are connected with the second unit; the second node is used for transmitting the power provided by the second target branch to the second unit; the second target branch circuit provides the branch circuit with the largest power for the fourth branch circuit and the fifth branch circuit;
the method further comprises the steps of:
and when the energy storage system is disconnected from the mains supply end, the second unit is powered by the access end of the direct current bus according to the third voltage value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311162718.6A CN117220261A (en) | 2023-09-08 | 2023-09-08 | Energy storage system and power supply method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311162718.6A CN117220261A (en) | 2023-09-08 | 2023-09-08 | Energy storage system and power supply method |
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| CN202311162718.6A Pending CN117220261A (en) | 2023-09-08 | 2023-09-08 | Energy storage system and power supply method |
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