CN115799721A - Energy storage system and temperature control method and device thereof - Google Patents
Energy storage system and temperature control method and device thereof Download PDFInfo
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Abstract
The disclosure provides an energy storage system and a temperature control method and device thereof, and relates to the technical field of energy storage. The method comprises the steps of obtaining first energy data of a direct current side of an energy conversion system in a current working cycle; acquiring second energy data of the battery pack in the current working period; determining the actual heating value of the energy storage system in the current working period according to the first energy data and the second energy data; determining the operation parameters of the refrigeration equipment in the next working period according to the actual calorific value of the energy storage system in the current working period, wherein the type of the current working period is the same as that of the next working period; and controlling the refrigeration equipment to operate according to the operating parameters in the next working period so as to cool the energy storage system. The method and the device can realize timely adjustment of the refrigerating capacity of the energy storage system along with the heating amount, optimize the heat exchange rate of the system and reduce the power consumption cost of the system during operation.
Description
Technical Field
The disclosure relates to the technical field of energy storage, and in particular to an energy storage system, an energy storage system temperature control method and an energy storage system temperature control device.
Background
The energy storage system generally includes a battery pack formed by connecting a certain number of single batteries in series or in parallel, and a battery system formed by connecting a plurality of battery packs in series. The battery pack generates certain heat in the charging and discharging process, and if the battery pack cannot be cooled in time, the service life of the battery pack is seriously influenced. Battery temperature control is a key factor in determining the degree of capacity fade and cycle life of an energy storage system battery.
In the related art, an air conditioner is generally used to cool the battery pack. The air conditioner refrigerating capacity is configured by adopting fixed power and is configured with a certain redundancy. However, the above temperature control method cannot flexibly adjust and control the cooling capacity of the air conditioner, and the heat exchange efficiency of the system cannot be maximized, thereby causing energy waste.
It is noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure and therefore may include information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The present disclosure provides an energy storage system and a temperature control method and device thereof, which at least overcome the problems of the prior art that the heat exchange efficiency cannot be maximized and energy is wasted due to the temperature control method of the energy storage system.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to one aspect of the present disclosure, there is provided a method for temperature control of an energy storage system, the energy storage system including an energy conversion system and a battery pack, the method comprising: acquiring first energy data of the direct current side of the energy conversion system in the current working period; acquiring second energy data of the battery pack in the current working period; determining the actual heating value of the energy storage system in the current working period according to the first energy data and the second energy data; determining operation parameters of refrigeration equipment in a next working period according to the actual heat productivity of the energy storage system in the current working period, wherein the type of the current working period is the same as that of the next working period; and controlling the refrigeration equipment to operate according to the operating parameters in the next working period so as to cool the energy storage system.
In the embodiment of the disclosure, by respectively obtaining the first energy data of the direct current side of the energy conversion system and the second energy data of the battery pack, the total energy generated by the system and the total energy actually consumed by the system in the current working period can be respectively obtained, so as to accurately determine the actual heat productivity of the system; the actual heat productivity of the energy storage system in the current working period is obtained, the operation parameters of the refrigeration equipment in the next working period are determined according to the actual heat productivity, the refrigeration equipment is controlled to operate according to the operation parameters in the next working period, the refrigerating capacity of the refrigeration equipment can be timely adjusted along with the heat productivity of the system, the temperature of the energy storage system is reduced, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, energy is saved, and the safety is improved.
In one embodiment of the present disclosure, the dc side of the energy conversion system is connected to an electric energy meter; the acquiring first energy data of the direct current side of the energy conversion system in the current working cycle includes: and acquiring the electric quantity value of the direct current side of the energy conversion system displayed by the electric energy meter as the first energy data.
In the embodiment of the disclosure, the electric energy value of the direct current side of the energy conversion system is acquired through the electric energy meter, and the first energy data is directly, quickly and efficiently obtained, so that accurate basic data is provided for the temperature control method of the energy storage system, and the temperature control precision is improved.
In one embodiment of the present disclosure, the energy storage system includes a battery management system connected to the battery pack; wherein the obtaining second energy data of the battery pack in the current working cycle includes: and acquiring second energy data of the battery pack, which is sent by the battery management system, wherein the second energy data is obtained by calculating the performance parameters of the battery pack monitored by the battery management system.
In the embodiment of the disclosure, the performance parameters of the battery pack are collected through the battery management system, and the second energy data of the battery pack are calculated, so that accurate basic data are provided for the temperature control of the energy storage system, and the temperature control precision is improved.
In one embodiment of the present disclosure, the duty cycle comprises a charging duty cycle or a discharging duty cycle; the actual heating value of the energy storage system in the current working period is determined by the following method: when the energy storage system is in a charging working cycle, the actual heating value of the energy storage system is the difference value of the first energy data and the second energy data; when the energy storage system is in a discharge working period, the actual heating value of the energy storage system is the difference value between the second energy data and the first energy data.
In the embodiment of the disclosure, when the energy storage system is in a charging working cycle, the energy conversion system converts alternating current of a power grid into direct current to supply power to the battery pack, at this time, the first energy data is total input energy generated by the energy storage system, and the second energy data is actual charging energy of the battery pack; when the energy storage system is in a discharge working cycle, the energy conversion system converts the electric energy of the battery pack into alternating current to supply power to an alternating current load, at the moment, the second energy data is the actual discharge energy of the battery pack, and the first energy data is the total output energy of the energy storage system. Under different working periods, the battery pack and the energy conversion system have different functions, so that the actual heat productivity of the energy storage system is determined according to the total input/output energy data of the direct current side of the energy conversion system and the actual charging/discharging energy data of the battery pack under different states, the actual heat productivity of the energy storage system is further ensured to be determined, and the temperature is controlled according to the actual heat productivity.
In an embodiment of the present disclosure, the determining, according to an actual calorific value of the energy storage system in the current working cycle, an operating parameter of a refrigeration device in a next working cycle includes: determining the refrigerating capacity of the refrigerating equipment in the next working period according to the actual heating value of the energy storage system in the current working period; and determining the operation parameters of the refrigeration equipment in the next working period according to the refrigerating capacity of the refrigeration equipment.
In the embodiment of the disclosure, the refrigeration capacity of the refrigeration equipment in the next working cycle is determined through the actual heat productivity of the energy storage system in the current working cycle, and certain redundancy of the refrigeration capacity configuration is ensured, so that the operation parameters of the refrigeration equipment are determined according to the refrigeration capacity, the stable control of the refrigeration equipment is realized, the heat exchange efficiency of the energy storage system is maximized, the power consumption cost of the system is reduced, and the electric energy is saved.
In an embodiment of the present disclosure, the determining the operation parameter of the refrigeration equipment in the next working cycle according to the cooling capacity of the refrigeration equipment includes: determining the refrigeration capacity grade of the refrigeration equipment according to the refrigeration capacity of the refrigeration equipment; and determining the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment based on the preset corresponding relation.
In the embodiment of the disclosure, on one hand, the refrigerating capacity of the refrigerating equipment is divided into different grades, so that the refrigerating equipment is convenient to control, and the reliability of the energy storage system is improved; on the other hand, the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade are determined by searching the preset corresponding relation, and the refrigeration equipment is quickly and timely controlled, so that the stability and the safety of the energy storage system are ensured.
In one embodiment of the present disclosure, the correspondence includes a correspondence table, and the correspondence table is used for representing a correspondence between the refrigeration capacity grade of the refrigeration equipment and the operation parameter of the refrigeration equipment; before searching for the operation parameter of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment based on the preset corresponding relation, the method further comprises the following steps: and constructing a corresponding relation table so as to determine the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment by searching the corresponding relation table.
In the embodiment of the disclosure, the corresponding relation between the grade of the refrigerated quantity of the refrigeration equipment and the operation parameter of the refrigeration equipment is represented by constructing the corresponding relation table, and the operation parameter of the refrigeration equipment is determined by looking up the table.
In one embodiment of the present disclosure, the operating parameters of the refrigeration appliance include at least one of: working power, wind gear, working duration and working frequency.
In the embodiment of the disclosure, the operation parameters of various refrigeration devices are set and adjusted together, so that the refrigeration capacity of the refrigeration devices is flexibly adjusted, and the energy consumption of the energy storage system is reduced.
According to another aspect of the present disclosure, there is also provided an energy storage system temperature control device, including: the acquisition module is used for acquiring first energy data of the direct current side of the energy conversion system in the current working period; the battery pack control system is also used for acquiring second energy data of the battery pack in the current working cycle; the determining module is used for determining the actual heating value of the energy storage system in the current working cycle according to the first energy data and the second energy data; the energy storage system is also used for determining the operation parameters of the refrigeration equipment in the next working cycle according to the actual heating value of the energy storage system in the current working cycle, wherein the type of the current working cycle is the same as that of the next working cycle; and the control module is used for controlling the refrigeration equipment to operate according to the operation parameters in the next working period so as to cool the energy storage system. In the embodiment of the disclosure, by combining the temperature control method of the energy storage system, the refrigerating capacity of the refrigeration equipment can be timely adjusted along with the heating capacity of the system, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, the energy is saved, and the safety is improved.
According to another aspect of the disclosure, an energy storage system is also provided, which includes a refrigeration device and an energy management system, and the energy management system includes the energy storage system temperature control device. In the embodiment of the disclosure, by combining the temperature control device of the energy storage system, the refrigerating capacity of the refrigerating equipment can be timely adjusted along with the heating capacity of the system, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, the energy is saved, and the safety is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 shows a flow chart of a temperature control method for an energy storage system according to an embodiment of the present disclosure;
fig. 2 shows a flowchart of a first energy data determining method of an energy storage system according to an embodiment of the disclosure;
fig. 3 shows a flowchart of a second energy data determination method of an energy storage system according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating another temperature control method for an energy storage system according to an embodiment of the disclosure;
fig. 5 is a flowchart illustrating a method for determining an operating parameter of a refrigeration device according to an embodiment of the present disclosure;
fig. 6 shows a schematic structural diagram of an energy storage system temperature control device provided in an embodiment of the present disclosure;
fig. 7 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present disclosure;
fig. 8 shows a schematic structural diagram of another energy storage system provided in the embodiment of the present disclosure.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terms "first", "second" and "first" are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more unless explicitly stated otherwise.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
In the related art, battery temperature control of an energy storage system is a key factor in determining the degree of battery capacity degradation and cycle life. The battery pack is usually cooled by an air cooling technology, low-temperature air is introduced into the battery pack through an air duct by directly refrigerating through an air conditioner, so that the temperature of the battery pack is controlled, but the temperature control precision and the temperature difference can be controlled to be about 10 ℃.
Generally, an air conditioner adopts a fixed power configuration, and the power configuration of the air conditioner is certain in redundancy considering that after operation is aged, the heat productivity of a battery is increased due to the increase of internal resistance of the battery. However, in the early-stage operation process of the energy storage system, the air conditioner operates according to redundant power, the generated refrigerating capacity is larger than the heating capacity of the energy storage system, the refrigerating capacity cannot be flexibly adjusted and controlled by the air conditioner, the system heat exchange cannot be maximized, and the energy storage system is wasted in electricity utilization cost.
Therefore, an energy storage system temperature control method capable of controlling the air conditioner and saving energy along with the heating value of the system needs to be designed.
Based on the above, the present disclosure provides an energy storage system temperature control method, which can respectively obtain the total energy generated by the system and the total energy actually consumed by the system in the current working period by respectively obtaining the first energy data on the direct current side of the energy conversion system and the second energy data of the battery pack, so as to accurately determine the actual calorific value of the system, and compared with a method of performing temperature control by using a temperature sensor or the like, the method is simple, easy to implement and convenient to operate, greatly shortens the temperature control time of the energy storage system, and improves the temperature control efficiency; the actual heat productivity of the energy storage system in the current working period is obtained, and the operation parameters of the refrigeration equipment in the next working period are determined according to the actual heat productivity so as to control the refrigeration equipment to operate with the operation parameters in the next working period, so that the refrigerating capacity of the refrigeration equipment can be timely adjusted along with the heat productivity of the system, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, energy is saved, and the safety is improved.
It should be noted that the embodiments of the present invention and the technical features of the embodiments may be combined with each other without conflict.
The present exemplary embodiment will be described in detail below with reference to the drawings and examples.
The embodiment of the present disclosure provides a temperature control method for an energy storage system, where the method may be executed by any system with computing processing capability, for example, the temperature control method for an energy storage system according to the embodiment of the present disclosure may be executed by an energy management system, and may also be executed by interaction between the energy management system and a battery management system, as well as between the energy management system and a refrigeration device.
Fig. 1 shows a flowchart of a temperature control method for an energy storage system according to an embodiment of the present disclosure. As shown in fig. 1, a method for controlling temperature of an energy storage system in an embodiment of the present disclosure, where the energy storage system includes an energy conversion system and a battery pack, includes:
s102, first energy data of the direct current side of the energy conversion system in the current working period are obtained.
In one embodiment, the energy storage System comprises an energy Conversion System, a battery pack and a battery management System, wherein the energy Conversion System (PCS) works in a rectification state when the battery pack is in a charging state, rectifies a grid-side alternating-current voltage into a direct-current voltage, and reduces the voltage to obtain a charging voltage of the battery pack so as to supply Power to the battery pack; when the battery pack is in a discharge state, the PCS works in an inversion state, receives voltage input by the battery pack at the direct current side of the PCS, and outputs proper alternating current voltage to supply power for an alternating current load.
The work cycle of the embodiment includes a charging work cycle or a discharging work cycle, and the work cycle can be configured according to actual conditions. The current working cycle may be a charging working cycle, that is, the battery pack in the energy storage system is in a charging state; the current duty cycle may also be a discharge duty cycle, i.e., the battery pack in the energy storage system is in a discharge state.
In an embodiment, the energy management system may directly obtain first energy data at the dc side of the energy conversion system in the current working cycle, and may also obtain related performance parameters at the dc side of the energy conversion system, and calculate the first energy data according to the related performance parameters, for example, the related parameters may be a voltage value, a current value, and the like at the dc side of the energy conversion system, and may calculate the first energy data according to the related parameters. The first energy data may be the total input energy at the dc side of the energy conversion system or the total output energy at the dc side of the energy conversion system.
And S104, acquiring second energy data of the battery pack in the current working period.
In an embodiment, the energy management system may directly obtain first energy data of the battery pack in the current working cycle, or may obtain second energy data of the battery pack through the battery management system, where the second energy data is obtained by calculating related performance parameters of the battery pack, where the related parameters may be, for example, a voltage value, a current value, and the like of the battery pack, and the second energy data may be obtained by calculating according to the related parameters. The second energy data may be an actual charging energy or an actual discharging energy of the battery pack.
And S106, determining the actual heating value according to the first energy data and the second energy data.
Based on the law of conservation of energy, the loss of energy in the transfer process is usually dissipated in the form of heat energy, so the actual heating value of the energy storage system can be determined according to the first energy data and the second energy data.
It should be noted that the actual heating value of the energy storage system is determined by the total energy provided by the energy storage system and the energy consumed by the energy storage system. When the energy storage system is in a charging working cycle, the total energy provided by the energy storage system is the total input energy of the direct current side of the energy conversion system, and the energy consumed by the energy storage system is the actual charging energy of the battery pack; when the energy storage system is in a discharge working period, the total energy provided by the energy storage system is the actual discharge energy of the battery pack, and the energy consumed by the energy storage system is the total output energy of the energy conversion system.
And S108, determining the operation parameters of the refrigeration equipment in the next working period according to the actual heat productivity of the energy storage system in the current working period, wherein the type of the current working period is the same as that of the next working period.
In one embodiment, the next duty cycle corresponds to the current duty cycle, and the current duty cycle and the next duty cycle are the same type of duty cycle, or are adjacent duty cycles with the same type, that is, the current duty cycle and the next duty cycle are the same type, are the same charging duty cycle, or are the same discharging duty cycle. When the current working cycle is a charging working cycle, the next working cycle is the next charging working cycle of the current working cycle; when the current working period is the discharging working period, the next working period is the next discharging working period of the current working period.
The refrigeration equipment may include air conditioners, fans, and the like capable of cooling the energy storage system or the battery pack within the energy storage system.
It should be noted that the operation parameters of the refrigeration equipment include, but are not limited to, the operating power, the wind gear, the operating duration, the operating frequency, and the like of the refrigeration equipment, and are adjusted together by setting the operation parameters of various refrigeration equipment, so that the refrigeration capacity of the refrigeration equipment is flexibly adjusted, and the energy consumption of the energy storage system is reduced.
And S110, controlling the refrigeration equipment to operate according to the operation parameters in the next working period so as to cool the energy storage system.
In one embodiment, the Energy storage System further includes an Energy Management System (EMS), the Energy Management System determines an operation parameter of the refrigeration equipment in the next working cycle according to the actual heat productivity of the Energy storage System in the current working cycle, the Energy Management System interacts with the refrigeration equipment, the Energy Management System sends communication information carrying the operation parameter of the refrigeration equipment in the next working cycle to the refrigeration equipment, the refrigeration equipment operates according to the received operation parameter, and meanwhile, the refrigeration equipment can also transmit signals such as current state information to the Energy Management System, so that the refrigeration capacity of the refrigeration equipment is timely adjusted along with the heat productivity of the System.
In the embodiment of the disclosure, by respectively obtaining the first energy data of the direct current side of the energy conversion system and the second energy data of the battery pack, the total energy generated by the system and the total energy actually consumed by the system in the current working period can be respectively obtained, so as to accurately determine the actual heat productivity of the system; the actual heat productivity of the energy storage system in the current working period is obtained, and the operation parameters of the refrigeration equipment in the next working period are determined according to the actual heat productivity so as to control the refrigeration equipment to operate according to the operation parameters in the next working period, so that the refrigerating capacity of the refrigeration equipment can be timely adjusted along with the heat productivity of the system, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, energy is saved, and the safety is improved.
In one embodiment, the actual heat generation of the energy storage system during the current duty cycle is determined by: when the energy storage system is in a charging working cycle, the actual heating value of the energy storage system is the difference value of the first energy data and the second energy data; when the energy storage system is in the discharge working cycle, the actual calorific value of the energy storage system is the difference between the second energy data and the first energy data, that is:
charging calorific value = total input energy at the direct current side of the energy conversion system-actual charging energy of the battery pack;
discharge heating value = actual discharge energy of the battery pack-to-energy conversion system dc side total output energy.
According to the temperature control method of the energy storage system, when the energy storage system is in a charging working cycle, the energy conversion system converts alternating current of a power grid into direct current to supply power to the battery pack, at the moment, first energy data are total input energy generated by the energy storage system, and second energy data are actual charging energy of the battery pack; when the energy storage system is in a discharge working cycle, the energy conversion system converts the electric energy of the battery pack into alternating current to supply power to an alternating current load, at the moment, the second energy data is the actual discharge energy of the battery pack, and the first energy data is the total output energy of the energy storage system. Under different working periods, the battery pack and the energy conversion system have different functions, so that the actual heat productivity of the energy storage system is determined according to the total input/output energy data of the direct current side of the energy conversion system and the actual charging/discharging energy data of the battery pack under different states, the actual heat productivity of the energy storage system is further ensured to be determined, and the temperature is controlled according to the actual heat productivity.
In other embodiments, the temperature rise value of the energy storage system can be determined by collecting the minimum temperature value and the maximum temperature value of the energy storage system in the current working period, and the actual heating value of the energy storage system in the current working period is determined according to the temperature rise value of the energy storage system.
Fig. 2 shows a flowchart of a first energy data determination method of an energy storage system according to an embodiment of the present disclosure. On the basis of the embodiment of fig. 1, S102 is further refined to S1022, so as to directly obtain the electric quantity value on the dc side of the energy conversion system through the electric energy meter. As shown in FIG. 1, in one embodiment, the method includes S1022, S104-S110. Specifically, the direct current side of the energy conversion system is connected with an electric energy meter, and the method comprises the following steps:
and S1022, acquiring the electric quantity value of the direct current side of the energy conversion system displayed by the electric energy meter as first energy data.
It should be noted that the foregoing S104 to S110 are the same as the specific implementation manners of S104 to S110 in the foregoing embodiments, and are not described again here.
The electric energy meter and the energy management system carry out information interaction, and the energy management system can read the electric quantity value of the direct current side of the energy conversion system displayed by the electric energy meter. The electric energy meter and the energy management system may interact in various ways, including wired or wireless ways, for example, the wireless way may include bluetooth, WIFI, and the like, and the disclosure is not limited specifically.
In the embodiment of the disclosure, the electric energy value of the direct current side of the energy conversion system is acquired through the electric energy meter, and the first energy data is directly, quickly and efficiently obtained, so that accurate basic data is provided for the temperature control method of the energy storage system, and the temperature control precision is improved.
In other embodiments, an electrical signal, such as a voltage value, a current value, etc., on the dc side of the energy conversion system may also be collected, and the first energy data may be calculated from the electrical signal on the dc side of the energy conversion system.
Fig. 3 shows a flowchart of a second energy data determination method of an energy storage system according to an embodiment of the present disclosure. On the basis of the embodiment of fig. 1, S104 is further refined to S1042 to determine the second energy data. As shown in FIG. 3, in one embodiment, the method includes S102, 1042, S106-S110. Specifically, the energy storage system comprises a battery management system connected with a battery pack, and the method comprises the following steps:
s1042, obtaining second energy data of the battery pack sent by the battery management system, wherein the second energy data is obtained by calculating performance parameters of the battery pack monitored by the battery management system.
It should be noted that the implementation manners of S102 and S106 to S110 are the same as the specific implementation manners of the foregoing embodiments, and are not described herein again.
In one embodiment, the battery management system interacts with the energy management system, and the battery management system monitors performance parameters of each battery pack, such as charging voltage, charging current, discharging voltage, discharging current, temperature, and the like of the battery pack, calculates second energy data of the battery pack in the current working cycle according to the performance parameters of each battery pack, and uploads the second energy data of the battery pack to the energy management system.
In another embodiment, the energy management system may further read, through communication, the performance parameter of the battery pack monitored by the battery management system, and calculate the second energy data of the battery pack according to the performance parameter of the battery pack.
It should be noted that the sampling frequency or sampling period of the battery management system for monitoring the performance parameters of the battery pack depends on the actual situation, for example, the sampling frequency or sampling period is acquired once every minute.
In the embodiment of the disclosure, the performance parameters of the battery pack are collected through the battery management system, and the second energy data of the battery pack are calculated, so that accurate basic data are provided for the temperature control of the energy storage system, and the temperature control precision is improved.
Fig. 4 shows a flowchart of another temperature control method for an energy storage system according to an embodiment of the present disclosure. On the basis of the embodiment of fig. 1, S108 is further refined into S1082 to S1084, so as to determine the cooling capacity of the refrigeration equipment in the next working cycle according to the actual heating value of the stored energy in the current working cycle, and further determine the operation parameters of the refrigeration equipment. As shown in fig. 4, in one embodiment, the temperature control method of the energy storage system provided by the present disclosure includes S102 to S106, S1082 to S1084, and S110. Specifically, the method comprises the following steps:
s1082, determining the refrigerating capacity of the refrigerating equipment in the next working cycle according to the actual heating value of the energy storage system in the current working cycle;
s1084, determining the operation parameters of the refrigeration equipment in the next working period according to the refrigerating capacity of the refrigeration equipment.
It should be noted that the implementation manners of S102 to S106 and S110 are the same as the specific implementation manners of the foregoing embodiments, and are not described herein again.
In one embodiment, the actual heating value Q of the energy storage system in the current working cycle can be determined T Directly as in the next working cycleRefrigerating capacity Q of a refrigerating device T+1 I.e. Q T+1 ＝Q T And T is the current working period of the energy storage system.
In one embodiment, the actual heat generation amount Q of the energy storage system in the current working cycle can also be used T Determining the refrigerating capacity Q of the refrigerating equipment in the next working period according to the correlation coefficient alpha T+1 I.e. Q T+1 ＝α×Q T Wherein α > 1. It should be noted that the correlation coefficient α may be determined according to factors such as the aging degree of the battery pack and the like, the ambient temperature, and the like, so as to configure a certain redundancy for the refrigeration equipment, thereby ensuring the refrigeration effect.
The correlation coefficient alpha can be preset by a user and can also be automatically adjusted according to the use condition of the energy storage system.
It should be noted that the operation parameters of the refrigeration equipment include, but are not limited to, the operating power, the air damper, the operating time, the operating frequency, etc. of the refrigeration equipment, the higher the operating power of the refrigeration equipment is, the higher the refrigeration capacity is, the higher the air damper of the refrigeration equipment is, the higher the refrigeration capacity is, the longer the operating time of the refrigeration equipment is, the higher the refrigeration capacity is, the higher the operating frequency of the refrigeration equipment is, the higher the refrigeration capacity is, that is, the refrigeration capacity of the refrigeration equipment is in a direct proportional relationship with the operation parameters of the refrigeration equipment, and the operation parameters of various refrigeration equipment are set and adjusted together, so that the refrigeration capacity of the refrigeration equipment is flexibly adjusted, and the energy consumption of the energy storage system is reduced.
In the actual use process of the refrigeration equipment, parameters such as a wind gear, working time, working frequency and the like of the refrigeration equipment can be fixed, and only the working power of the refrigeration equipment is adjusted; a plurality of operating parameters may also be adjusted simultaneously to precisely adjust the cooling capacity of the refrigeration equipment, which is not specifically limited in this disclosure.
According to the temperature control method for the energy storage system, the refrigerating capacity of the refrigerating equipment in the next working cycle is determined through the actual heat productivity of the energy storage system in the current working cycle, and certain redundancy of the refrigerating capacity configuration is guaranteed, so that the operation parameters of the refrigerating equipment are determined according to the refrigerating capacity, the stable control of the refrigerating equipment is realized, the heat exchange efficiency of the energy storage system is maximized, the power consumption cost of the system is reduced, and the electric energy is saved.
Fig. 5 shows a flowchart of an operation parameter determination method of a refrigeration apparatus according to an embodiment of the present disclosure. On the basis of the above embodiment, the above S1084 is further refined into S502 to S504, so as to search the matched operation parameters of the refrigeration equipment according to the refrigeration capacity level of the refrigeration equipment. As shown in fig. 5, in an embodiment, the step S1084 of determining the operation parameters of the refrigeration device in the next operation cycle according to the cooling capacity of the refrigeration device includes:
s502, determining the refrigerating capacity grade of the refrigerating equipment according to the refrigerating capacity of the refrigerating equipment;
s504, based on the preset corresponding relation, searching for the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment.
In the actual use process, the refrigerating capacity of the refrigerating equipment does not need to be adjusted to a certain accurate value, different refrigerating capacity grades can be divided according to the refrigerating capacity of the refrigerating equipment, the refrigerating capacity of the refrigerating equipment is determined according to the actual heat dissipation capacity, and then the refrigerating capacity grade is matched.
For example, the refrigerating capacity of the refrigeration equipment is divided into four refrigerating capacity grades, namely a first-stage refrigerating capacity, a second-stage refrigerating capacity, a third-stage refrigerating capacity and a fourth-stage refrigerating capacity, each refrigerating capacity grade corresponds to different refrigerating capacity intervals, and generally, the higher the refrigerating capacity grade is, the larger the corresponding refrigerating capacity is.
The preset correspondence may be pre-configured in the energy management system, and the preset correspondence is used to represent a correspondence between a refrigeration level of the refrigeration equipment and an operating parameter of the refrigeration equipment.
In one embodiment, the correspondence includes a correspondence table, the correspondence table is used for representing a correspondence between the refrigeration capacity grade of the refrigeration equipment and the operation parameter of the refrigeration equipment, the correspondence table is pre-configured in the energy management system, when the refrigeration capacity of the refrigeration equipment in the next working cycle is determined according to the actual heat dissipation capacity of the energy storage system in the current working cycle, the refrigeration capacity of the refrigeration equipment is divided into the corresponding refrigeration capacity grades, and the operation parameter of the refrigeration equipment corresponding to the refrigeration capacity grades can be matched by searching the correspondence table.
It should be noted that, in the actual use process, the correspondence table needs to be constructed in advance, so as to determine the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment by searching the correspondence table, and determine the operation parameters of the refrigeration equipment by table lookup, which is simple and efficient.
In the embodiment of the disclosure, on one hand, the refrigerating capacity of the refrigerating equipment is divided into different grades, so that the refrigerating equipment is convenient to control, and the reliability of the energy storage system is improved; on the other hand, the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade are determined by searching the preset corresponding relation table, and the refrigeration equipment is quickly and timely controlled, so that the stability and the safety of the energy storage system are ensured.
The corresponding relationship between the refrigeration capacity grade of the refrigeration equipment and the operation parameter of the refrigeration equipment can be represented by adopting a corresponding relationship table, and the representation can also be carried out by adopting a grade parameter corresponding curve, a graph and other forms, and the disclosure is not particularly limited.
Based on the same inventive concept, the embodiment of the present disclosure further provides a temperature control device of an energy storage system, as described in the following embodiments. Because the principle of solving the problem of the embodiment of the apparatus is similar to that of the embodiment of the method, reference may be made to the implementation of the embodiment of the apparatus, and repeated descriptions are omitted.
Fig. 6 shows a schematic structural diagram of an energy storage system temperature control device provided in an embodiment of the present disclosure. As shown in fig. 6, an energy storage system temperature control apparatus 600 provided by an embodiment of the present disclosure includes an obtaining module 601, a determining module 602, and a control module 603.
Wherein: an obtaining module 601, configured to obtain first energy data at a direct current side of an energy conversion system in a current working cycle; the battery pack control system is also used for acquiring second energy data of the battery pack in the current working cycle; the determining module 602 is configured to determine an actual heating value of the energy storage system in the current working cycle according to the first energy data and the second energy data; the system is also used for determining the operation parameters of the refrigeration equipment in the next working cycle according to the actual heat productivity of the energy storage system in the current working cycle, wherein the type of the current working cycle is the same as that of the next working cycle; and the control module 603 is configured to control the refrigeration equipment to operate according to the operation parameters in a next working cycle, so as to cool the energy storage system.
In an embodiment, the direct current side of the energy conversion system is connected to an electric energy meter, and the obtaining module 601 is specifically configured to obtain an electric quantity value of the direct current side of the energy conversion system displayed by the electric energy meter as the first energy data.
In an embodiment, the energy storage system includes a battery management system connected to the battery pack, and the obtaining module 601 is specifically configured to obtain second energy data of the battery pack sent by the battery management system, where the second energy data is obtained by calculating a performance parameter of the battery pack monitored by the battery management system.
It should be noted that the working cycle includes a charging working cycle or a discharging working cycle, and the determining module 602 is configured to determine an actual heating value of the energy storage system in the current working cycle, where when the energy storage system is in the charging working cycle, the actual heating value of the energy storage system is a difference between the first energy data and the second energy data; when the energy storage system is in the discharge working period, the actual heating value of the energy storage system is the difference value between the second energy data and the first energy data.
In one embodiment, the determining module 602 is specifically configured to determine the cooling capacity of the refrigeration device in the next working cycle according to the actual heating value of the energy storage system in the current working cycle; and determining the operation parameters of the refrigeration equipment in the next working period according to the refrigerating capacity of the refrigeration equipment.
In one embodiment, the determining module 602 is further configured to determine a cooling capacity level of the refrigeration device according to the cooling capacity of the refrigeration device; and searching the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment based on the preset corresponding relation.
In one embodiment, the correspondence includes a correspondence table, and the correspondence table is used for representing the correspondence between the refrigeration capacity grade of the refrigeration equipment and the operation parameter of the refrigeration equipment; the device also comprises a construction module which is not shown in the attached figure and is used for constructing a corresponding relation table so as to determine the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment by searching the corresponding relation table.
It should be noted that the operation parameters of the refrigeration equipment include at least one of the following: working power, gear, working duration and working frequency.
The temperature control device of the energy storage system provided by the embodiment of the disclosure is combined with the temperature control method of the energy storage system, so that the refrigerating capacity of the refrigerating equipment can be timely adjusted along with the heating capacity of the system, the heat exchange rate of the system is optimized, the power consumption cost of the system during operation is reduced, the energy is saved, and the safety is improved.
Fig. 7 shows a schematic structural diagram of an energy storage system provided in an embodiment of the present disclosure. As shown in fig. 7, in an embodiment, the present disclosure further provides an energy storage system 700, which includes a refrigeration device 702 and an energy management system 701, where the energy management system 701 includes the energy storage system temperature control device, and the energy storage system temperature control device is combined to enable the cooling capacity of the refrigeration device 702 to be adjusted timely along with the heating value of the system, so as to optimize the heat exchange rate of the system, reduce the power consumption cost of the system during operation, save energy, and improve safety.
Fig. 8 shows a schematic structural diagram of another energy storage system provided in the embodiment of the present disclosure. As shown in fig. 8, an energy storage system 700 provided in the embodiment of the present disclosure includes an energy management system 701, a refrigeration device 702, an energy conversion system 703, an electric energy meter 704, a battery pack 705, and a battery management system 706.
The energy conversion system 703 is connected to the battery pack 705 through a cut-off device 707, and the cut-off device 707 is used to control the opening or closing of the circuit.
An electric energy meter 704 is arranged on a line between the energy conversion system 703 and the cut-off device 707, the electric energy meter 704 interacts with the energy management system 701, and the electric energy meter 704 is configured to measure an electric energy value on the dc side of the energy conversion system 703 and send the electric energy value on the dc side of the energy conversion system 703 to the energy management system 701, where the electric energy value is used as first energy data of the energy storage system in the current working cycle.
Battery pack 705 is connected to battery management system 706, battery management system 706 is configured to monitor a performance parameter of battery pack 705, and send the performance parameter of battery pack 705 to energy management system 701, and energy management system 701 calculates second energy data of battery pack 705 in the current working cycle according to the performance parameter of battery pack 705.
The energy management system 701 is configured to calculate an actual heat dissipation amount of the energy storage system in a current working cycle according to the first energy data and the second energy data, and further determine an operation parameter of the refrigeration device 702 in a next working cycle.
The energy management system 701 interacts with the refrigeration equipment 702 and sends the operating parameters of the refrigeration equipment 702 in the next duty cycle to the refrigeration equipment 702 to control the refrigeration equipment 702 to operate with the received operating parameters.
The system can adjust the refrigerating capacity of the refrigerating equipment in due time along with the heating amount of the system, optimize the heat exchange rate of the system, reduce the power consumption cost of the system in operation, save energy and improve safety.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. A method for controlling temperature of an energy storage system, wherein the energy storage system comprises an energy conversion system and a battery pack, the method comprising:
acquiring first energy data of the direct current side of the energy conversion system in the current working period;
acquiring second energy data of the battery pack in the current working period;
determining the actual heating value of the energy storage system in the current working period according to the first energy data and the second energy data;
determining operation parameters of refrigeration equipment in a next working period according to the actual heat productivity of the energy storage system in the current working period, wherein the type of the current working period is the same as that of the next working period;
and controlling the refrigeration equipment to operate according to the operating parameters in the next working period so as to cool the energy storage system.
2. The energy storage system temperature control method according to claim 1, wherein the direct current side of the energy conversion system is connected with an electric energy meter;
the acquiring first energy data of the direct current side of the energy conversion system in the current working cycle includes:
and acquiring the electric quantity value of the direct current side of the energy conversion system displayed by the electric energy meter as the first energy data.
3. The method of claim 1, wherein the energy storage system comprises a battery management system coupled to the battery pack;
wherein the obtaining second energy data of the battery pack in the current working cycle includes:
and acquiring second energy data of the battery pack, which is sent by the battery management system, wherein the second energy data is obtained by calculating the performance parameters of the battery pack monitored by the battery management system.
4. The method of claim 1, wherein the duty cycle comprises a charging duty cycle or a discharging duty cycle;
the actual heating value of the energy storage system in the current working period is determined by the following method:
when the energy storage system is in a charging working cycle, the actual heating value of the energy storage system is the difference value of the first energy data and the second energy data;
when the energy storage system is in a discharge working period, the actual heating value of the energy storage system is the difference value between the second energy data and the first energy data.
5. The method for controlling the temperature of the energy storage system according to claim 1, wherein the determining the operation parameters of the refrigeration equipment in the next working cycle according to the actual heating value of the energy storage system in the current working cycle comprises:
determining the refrigerating capacity of the refrigerating equipment in the next working period according to the actual heating value of the energy storage system in the current working period;
and determining the operation parameters of the refrigeration equipment in the next working period according to the refrigerating capacity of the refrigeration equipment.
6. The method for controlling temperature of an energy storage system according to claim 5, wherein the determining the operation parameter of the refrigeration equipment in the next working cycle according to the cooling capacity of the refrigeration equipment comprises:
determining the refrigeration capacity grade of the refrigeration equipment according to the refrigeration capacity of the refrigeration equipment;
and determining the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment based on the preset corresponding relation.
7. The temperature control method of the energy storage system according to claim 6, wherein the correspondence comprises a correspondence table, and the correspondence table is used for representing the correspondence between the refrigeration capacity grade of the refrigeration equipment and the operation parameter of the refrigeration equipment;
before searching for the operation parameter of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment based on the preset corresponding relation, the method further comprises the following steps:
and constructing a corresponding relation table so as to determine the operation parameters of the refrigeration equipment matched with the refrigeration capacity grade of the refrigeration equipment by searching the corresponding relation table.
8. The energy storage system temperature control method according to any one of claims 1-7, wherein the operating parameter of the refrigeration equipment comprises at least one of: working power, wind gear, working duration and working frequency.
9. An energy storage system temperature control device, comprising:
the acquisition module is used for acquiring the actual heat productivity of the energy storage system in the current working cycle;
the determining module is used for determining the operation parameters of the refrigeration equipment in the next working period according to the actual heat productivity of the energy storage system in the current working period;
and the control module is used for controlling the refrigeration equipment to operate according to the operation parameters in the next working period so as to cool the energy storage system.
10. An energy storage system, comprising: refrigeration equipment and an energy management system comprising the energy storage system temperature control device of claim 9.
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| CN202211634338.3A CN115799721A (en) | 2022-12-19 | 2022-12-19 | Energy storage system and temperature control method and device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116937631A (en) * | 2023-09-18 | 2023-10-24 | 众至诚信息技术股份有限公司 | Electric energy storage management system based on data processing |
| CN117458048A (en) * | 2023-09-04 | 2024-01-26 | 东莞市深合电气有限公司 | Refrigerating capacity control method of liquid cooling unit, liquid cooling unit and energy storage system |
-
2022
- 2022-12-19 CN CN202211634338.3A patent/CN115799721A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117458048A (en) * | 2023-09-04 | 2024-01-26 | 东莞市深合电气有限公司 | Refrigerating capacity control method of liquid cooling unit, liquid cooling unit and energy storage system |
| CN117458048B (en) * | 2023-09-04 | 2024-05-24 | 东莞市深合电气有限公司 | Refrigerating capacity control method of liquid cooling unit, liquid cooling unit and energy storage system |
| CN116937631A (en) * | 2023-09-18 | 2023-10-24 | 众至诚信息技术股份有限公司 | Electric energy storage management system based on data processing |
| CN116937631B (en) * | 2023-09-18 | 2023-11-21 | 众至诚信息技术股份有限公司 | Electric energy storage management system based on data processing |
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