A container energy storage system based on intelligent monitoring

Abstract

The present invention relates to the technical field of battery energy storage, and particularly to a container energy storage system based on intelligent monitoring, including: an energy storage module for storing DC electric energy; a power supply module connected to the energy storage module for converting the DC electric energy into AC electric energy and then delivering it to the power consumption end; a monitoring module connected to the energy storage module for monitoring energy storage operation data; an alarm module connected to the monitoring module for giving an alarm when the energy storage operation data is abnormal; and a control module respectively connected to the energy storage module, the power supply module, the monitoring module and the alarm module for adjusting the charging depth of the battery pack or adjusting the gain intensity of the filter according to the fluctuation amplitude of the output voltage of the battery pack when it is determined that the effectiveness of the container energy storage process does not meet the requirements according to the variance of the output power of the battery pack. The present invention realizes the improvement of the effectiveness of the container energy storage process.

Description

Technical Field

[0001] The present invention relates to the technical field of battery energy storage, and in particular to a container energy storage system based on intelligent monitoring. Background Art

[0002] In the existing technology, with the development of national production and the improvement of people's living standards, there are higher requirements for the demand and amount of electricity. With the increasing prominence of environmental problems, countries around the world have proposed to develop clean energy, such as vigorously developing hydropower, wind power, and solar power generation. Energy storage power stations are another type of equipment that the country has advocated in recent years to effectively store and utilize energy. They play a very important role in supplementing power to the power grid and adjusting the peak and valley of the power grid. At the same time, they can also effectively store electricity generated by solar energy, wind energy, etc., and provide uninterrupted power supply for power outages, field exploration, mining, emergency rescue, and areas with power shortages. As a type of energy storage power station, lithium battery containers have many advantages such as ultra-long life, safe use, no memory effect, small size, light weight, and green environmental protection, so they are used in many places.

[0003] Chinese Patent Publication No.: CN109301942A discloses a battery container intelligent energy storage system and its workflow, including an energy supply device, a first battery group, a second battery group and a monitoring device, wherein the energy supply device, the monitoring device and the first battery group are connected in series in sequence, and the second battery group is connected in parallel with the first battery group, and the monitoring device includes a controller, a first battery management system, a second battery management system, a first relay and a second relay, wherein the first battery management system, the second battery management system, the first relay and the second relay are all electrically connected to the controller, the first battery management system is electrically connected to the first battery group, the second battery management system is electrically connected to the second battery management system, the first relay is connected in series between the first battery group and the energy supply device, and the second relay is connected in series between the second battery group and the energy supply device. It can be seen that the battery container intelligent energy storage system and its workflow have the problem that the output power is reduced and the conversion efficiency is reduced due to the aging of the inverter during long-term use, which leads to a deviation between the charge and discharge amount of the charge and discharge process and the expected amount, thereby reducing the effectiveness of the container energy storage process. Summary of the invention

[0004] To this end, the present invention provides a container energy storage system based on intelligent monitoring, which is used to overcome the problem in the prior art that the inverter ages due to long-term use, resulting in reduced output power and lower conversion efficiency, which in turn leads to a deviation between the charge and discharge amount of the charge and discharge process and the expected amount, thereby reducing the effectiveness of the container energy storage process.

[0005] To achieve the above-mentioned purpose, the present invention provides a container energy storage system based on intelligent monitoring, comprising: an energy storage module for storing DC power, including a battery pack for storing the DC power and a filter connected to the battery pack for filtering out high-frequency switching signals in the battery pack; a power supply module connected to the energy storage module for converting the DC power into AC power and then transmitting it to the power consumption end; a monitoring module connected to the energy storage module for monitoring the energy storage operation data; an alarm module connected to the monitoring module for issuing an alarm when the energy storage operation data is abnormal; and a control module connected to the monitoring module for respectively The energy storage module, the power supply module, the monitoring module and the alarm module are connected to each other, and are used to adjust the charging depth of the battery pack or adjust the gain strength of the filter according to the fluctuation amplitude of the battery pack output voltage when it is determined that the effectiveness of the container energy storage process does not meet the requirements according to the variance of the battery pack's output power, and to adjust the discharge rate of the battery pack in combination with the fluctuation amplitude of the battery pack output voltage and the temperature rise rate of the battery pack; wherein, the abnormality of the energy storage operation data is that the output voltage of the battery pack is greater than the standard output voltage, the temperature of the battery pack is greater than the standard temperature, and the output current of the battery pack is greater than the standard output current.

[0006] Furthermore, the power supply module includes:

[0007] an electric energy conversion unit, connected to the filter, for converting the direct current electric energy into alternating current electric energy;

[0008] A transmission unit is connected to the power conversion unit and is used to transmit the AC power to the power consumption end.

[0009] Furthermore, the monitoring module includes:

[0010] A voltage sensor, which is arranged at the output end of the battery pack and is used to detect the output voltage of the battery pack;

[0011] A current sensor, which is arranged at the output end of the battery pack and is used to detect the output current of the battery pack;

[0012] The temperature sensor is arranged on the surface of the battery pack to detect the temperature of the surface of the battery pack.

[0013] Furthermore, the energy storage operation data includes the output voltage of the battery pack, the output power of the battery pack and the output current of the battery pack.

[0014] Further, the control module is used to calculate the variance of the output power of the battery pack according to the output voltage and the output current of the battery pack in several monitoring cycles obtained, and to determine that the effectiveness of the container energy storage process does not meet the requirements when the variance of the output power of the battery pack meets the first variance condition or the second variance condition;

[0015] The first variance condition is that the variance of the output power of the battery pack is greater than a preset first variance and less than or equal to a preset second variance; the second variance condition is that the variance of the output power of the battery pack is greater than the preset second variance.

[0016] Furthermore, the control module is used to preliminarily determine that the energy storage performance of the battery pack does not meet the requirements when the variance of the output power of the battery pack only satisfies the first variance condition, and to make a secondary determination on whether the energy storage performance of the battery pack meets the requirements based on the fluctuation amplitude of the output voltage of the battery pack.

[0017] Further, the control module reduces the depth of charge of the battery pack when the variance of the output power of the battery pack only satisfies the second variance condition;

[0018] The reduction range of the charging depth of the battery pack is determined by the difference between the variance of the output power of the battery pack and a preset second variance.

[0019] Furthermore, when the fluctuation amplitude of the output voltage of the battery pack meets the first fluctuation amplitude condition or the second fluctuation amplitude condition, the control module secondarily determines that the energy storage performance of the battery pack does not meet the requirements;

[0020] The control module preliminarily determines that the stability of the battery pack regional environment does not meet the requirements when the fluctuation amplitude of the battery pack output voltage only meets the second fluctuation amplitude condition, and performs a secondary determination on whether the stability of the battery pack regional environment meets the requirements according to the temperature increase rate of the battery pack;

[0021] Among them, the first fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, and the second fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset second fluctuation amplitude.

[0022] Further, the control module increases the gain strength of the filter when the fluctuation amplitude of the output voltage of the battery pack only satisfies the first fluctuation amplitude condition;

[0023] The increase range of the gain strength of the filter is determined by the difference between the fluctuation range of the battery pack output voltage and a preset first fluctuation range.

[0024] Furthermore, the control module secondarily determines that the stability of the battery pack area environment does not meet the requirements when the temperature increase rate of the battery pack is greater than a preset increase rate, and reduces the discharge rate of the battery pack;

[0025] The rate of decrease of the discharge rate of the battery pack is determined by the difference between the temperature increase rate of the battery pack and a preset increase rate.

[0026] Compared with the prior art, the beneficial effect of the present invention lies in that the system of the present invention adjusts the charging depth of the battery pack according to the variance of the output power of the battery pack by setting an energy storage module, a power supply module, a monitoring module, an alarm module and a control module. Due to the aging of the inverter over a long period of time, the output power is reduced and the conversion efficiency is reduced, which leads to a deviation between the charging and discharging amount and the expected amount during the charging and discharging process, thereby causing incomplete charging and discharging. By reducing the charging depth of the battery pack, the probability of energy loss due to reduced inverter efficiency is reduced. By adjusting the gain strength of the filter according to the fluctuation amplitude of the output voltage of the battery pack, since there is a battery management system inside the container energy storage system, The high-frequency switching signal inside the system will generate electromagnetic interference, causing the battery management system to be unable to work properly when managing the battery pack, which in turn causes the battery performance to decline, thereby causing the output voltage fluctuation amplitude to increase. By reducing the gain strength of the filter, the degree of interference to the battery management system due to the high-frequency switching signal is reduced. By adjusting the discharge rate of the battery pack according to the temperature rise rate of the battery pack, the heat dissipation channel inside the battery pack is blocked by dust and other substances, and the heat cannot be effectively dissipated, resulting in an increase in the temperature of the battery pack surface. By reducing the discharge rate of the battery pack, the energy conversion and heat generation inside the battery pack are reduced, thereby improving the effectiveness of the container energy storage process.

[0027] Furthermore, the system of the present invention adjusts the charging depth of the battery pack by setting a preset first variance and a preset second variance. Due to the aging of the inverter due to long-term use, the output power is reduced and the conversion efficiency is reduced, which in turn causes a deviation between the charging and discharging amount and the expected amount during the charging and discharging process, resulting in incomplete charging and discharging. By reducing the charging depth of the battery pack, the probability of energy loss due to reduced inverter efficiency is reduced, thereby further achieving an improvement in the effectiveness of the container energy storage process.

[0028] Furthermore, the system of the present invention adjusts the gain strength of the filter by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude. Since there is a battery management system inside the container energy storage system, the internal high-frequency switching signal will generate electromagnetic interference, causing the battery management system to be unable to work normally when managing the battery pack, thereby causing the battery performance to deteriorate, thereby causing the fluctuation amplitude of the output voltage to increase. By reducing the gain strength of the filter, the degree of interference of the battery management system due to the high-frequency switching signal is reduced, thereby further achieving an improvement in the effectiveness of the container energy storage process.

[0029] Furthermore, the system of the present invention adjusts the discharge rate of the battery pack by setting a preset increase rate. Since the heat dissipation channels inside the battery pack are blocked by dust and other substances, the heat cannot be effectively dissipated, which causes the temperature of the battery pack surface to rise. By reducing the discharge rate of the battery pack, the energy conversion and heat generation inside the battery pack are reduced, thereby further improving the effectiveness of the container energy storage process. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The overall structural block diagram of the container energy storage system based on intelligent monitoring according to an embodiment of the present invention;

[0031] Figure 2 This is a logic flow chart of a container energy storage system based on intelligent monitoring according to an embodiment of the present invention;

[0032] Figure 3 A specific structural block diagram of an energy storage module of a container energy storage system based on intelligent monitoring according to an embodiment of the present invention;

[0033] Figure 4 The present invention is a block diagram of the connection structure of the energy storage module and the control module of the container energy storage system based on intelligent monitoring according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0036] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall structural block diagram of a container energy storage system based on intelligent monitoring, a logic flow chart, a specific structural block diagram of an energy storage module, and a connection structural block diagram of an energy storage module and a control module. A container energy storage system based on intelligent monitoring of the present invention comprises:

[0039] An energy storage module, for storing direct current electric energy, comprising a battery pack for storing the direct current electric energy and a filter connected to the battery pack for filtering out high-frequency switching signals in the battery pack;

[0040] A power supply module, which is connected to the energy storage module and is used to convert the DC power into AC power and then transmit it to the power consumption end;

[0041] A monitoring module, which is connected to the energy storage module and is used to monitor energy storage operation data;

[0042] An alarm module, connected to the monitoring module, for issuing an alarm when abnormalities occur in the energy storage operation data;

[0043] a control module, which is respectively connected to the energy storage module, the power supply module, the monitoring module and the alarm module, and is used to adjust the charging depth of the battery pack or adjust the gain strength of the filter according to the fluctuation amplitude of the output voltage of the battery pack when it is determined that the effectiveness of the container energy storage process does not meet the requirements according to the variance of the output power of the battery pack, and to adjust the discharge rate of the battery pack in combination with the fluctuation amplitude of the output voltage of the battery pack and the temperature rise rate of the battery pack;

[0044] The abnormality of the energy storage operation data is that the output voltage of the battery pack is greater than the standard output voltage, the temperature of the battery pack is greater than the standard temperature, and the output current of the battery pack is greater than the standard output current.

[0045] In particular, a preferred embodiment of the filter is a low-pass filter.

[0046] Specifically, the depth of charge of a battery pack refers to the ratio of the amount of charge that has been stored in the battery pack during the charging process to the total amount of charge in the battery pack.

[0047] Specifically, the discharge rate of the battery pack is adjusted by changing the size of the discharge current.

[0048] Specifically, the standard output voltage, standard temperature, and standard output current can all be set accordingly according to the application scenario.

[0049] In implementation, the system of the present invention is provided with an energy storage module, a power supply module, a monitoring module, an alarm module and a control module, and adjusts the charging depth of the battery pack according to the variance of the output power of the battery pack. Due to the aging of the inverter after long-term use, the output power is reduced, the conversion efficiency is reduced, and then there is a deviation between the charging and discharging amount and the expected amount in the charging and discharging process, which leads to incomplete charging and discharging. By reducing the charging depth of the battery pack, the probability of energy loss due to reduced inverter efficiency is reduced. By adjusting the gain strength of the filter according to the fluctuation amplitude of the output voltage of the battery pack, since there is a battery management system inside the container energy storage system, the internal high High-frequency switching signals will generate electromagnetic interference, causing the battery management system to be unable to work properly when managing the battery pack, which in turn causes the battery performance to decline, resulting in an increase in the fluctuation range of the output voltage. By reducing the gain strength of the filter, the degree of interference to the battery management system due to high-frequency switching signals is reduced. By adjusting the discharge rate of the battery pack according to the temperature rise rate of the battery pack, the heat dissipation channel inside the battery pack is blocked by dust and other substances, and the heat cannot be effectively dissipated, resulting in an increase in the temperature of the battery pack surface. By reducing the discharge rate of the battery pack, the energy conversion and heat generation inside the battery pack are reduced, thereby improving the effectiveness of the container energy storage process.

[0050] Specifically, the power supply module includes:

[0051] an electric energy conversion unit, connected to the filter, for converting the direct current electric energy into alternating current electric energy;

[0052] A transmission unit is connected to the power conversion unit and is used to transmit the AC power to the power consumption end.

[0053] Specifically, the electric energy conversion unit is an inverter.

[0054] In particular, a preferred embodiment of the inverter is a voltage source inverter.

[0055] Specifically, the transmission unit is a power transmission line.

[0056] Specifically, the monitoring module includes:

[0057] A voltage sensor, which is arranged at the output end of the battery pack and is used to detect the output voltage of the battery pack;

[0058] A current sensor, which is arranged at the output end of the battery pack and is used to detect the output current of the battery pack;

[0059] The temperature sensor is arranged on the surface of the battery pack to detect the temperature of the surface of the battery pack.

[0060] Specifically, the energy storage operation data includes the output voltage of the battery pack, the output power of the battery pack and the output current of the battery pack.

[0061] Specifically, the control module is used to calculate the variance of the output power of the battery pack according to the output voltage and the output current of the battery pack in several monitoring cycles obtained, and to determine that the effectiveness of the container energy storage process does not meet the requirements when the variance of the output power of the battery pack meets the first variance condition or the second variance condition;

[0062] The first variance condition is that the variance of the output power of the battery pack is greater than a preset first variance and less than or equal to a preset second variance; the second variance condition is that the variance of the output power of the battery pack is greater than the preset second variance.

[0063] It can be understood that the three intervals corresponding to the preset first variance Q1 and the preset second variance Q2 correspond to three situations respectively. The first situation is Q≤Q1, and the effectiveness of the container energy storage process is judged to meet the requirements; the second situation is Q1<Q≤Q2, and there is a battery management system inside the container energy storage system. The internal high-frequency switching signal will generate electromagnetic interference, causing the battery management system to fail to work normally when managing the battery pack, thereby causing battery performance to deteriorate; the third situation is Q>Q2, and the inverter ages after long-term use, resulting in reduced output power and reduced conversion efficiency, which in turn causes a deviation between the charge and discharge amount of the charge and discharge process and the expected amount, resulting in incomplete charging and discharging. In practice, Q1 is generally selected in the range of [2.5KW 2 , 3.5KW 2 ], Q2 is generally selected in the range of [3.5KW 2 , 4.5KW 2 ].

[0064] Preferably, the first variance Q1 is preset to be 3KW 2 , preset second variance Q2 = 4KW 2 .

[0065] Specifically, the variance of the output power of the battery pack is denoted as Q.

[0066] Specifically, the variance of the output power of the battery pack is the variance of the output power of the battery pack within several monitoring cycles. The calculation method of the variance of the output power of the battery pack is a conventional technical means well known to those skilled in the art, so the calculation process of the variance of the output power of the battery pack will not be repeated here.

[0067] In implementation, the system of the present invention determines the effectiveness of the container energy storage process by setting a preset first variance and a preset second variance, thereby reducing the impact of the decreased energy storage stability of the container energy storage system due to inaccurate determination of the effectiveness of the container energy storage process, and further improving the effectiveness of the container energy storage process.

[0068] Specifically, the control module is used to preliminarily determine that the energy storage performance of the battery pack does not meet the requirements when the variance of the output power of the battery pack only meets the first variance condition, and to make a secondary determination on whether the energy storage performance of the battery pack meets the requirements based on the fluctuation amplitude of the output voltage of the battery pack.

[0069] Specifically, the control module reduces the charging depth of the battery pack when the variance of the output power of the battery pack only satisfies the second variance condition;

[0070] The reduction range of the charging depth of the battery pack is determined by the difference between the variance of the output power of the battery pack and a preset second variance.

[0071] Specifically, the calculation formula for the reduced depth of charge of the battery pack is:

[0072]

[0073] Wherein, V' is the reduced depth of charge of the battery pack, V is the current depth of charge of the battery pack, A is the minimum unit variance for adjusting the depth of charge of the battery pack, and v is the depth of charge of the battery pack when the variance of the output power of the battery pack is the minimum unit variance.

[0074] In practice, the value of A is generally 4KW. 2 ~6KW 2 , preferably, the preferred embodiment of A is 5KW 2 .

[0075] In implementation, the optional range of the value of v is [60%, 80%]. Preferably, when the charging depth of the battery pack is greater than 70%, incomplete charging and discharging may occur. Therefore, the preferred embodiment of v is 70%.

[0076] Specifically, when the value of V' is a decimal, the value of V' is automatically rounded up to an integer.

[0077] For example, a container energy storage system based on intelligent monitoring is used to supply power to a port terminal, where V = 90%, Q = 6KW 2 , calculated

[0078] In implementation, the system of the present invention adjusts the charging depth of the battery pack by setting a preset first variance and a preset second variance. Due to the aging of the inverter due to long-term use, the output power is reduced and the conversion efficiency is reduced, which in turn causes a deviation between the charging and discharging amount and the expected amount during the charging and discharging process, resulting in incomplete charging and discharging. By reducing the charging depth of the battery pack, the probability of energy loss due to reduced inverter efficiency is reduced, and the effectiveness of the container energy storage process is further improved.

[0079] Specifically, when the fluctuation amplitude of the output voltage of the battery pack meets the first fluctuation amplitude condition or the second fluctuation amplitude condition, the control module secondarily determines that the energy storage performance of the battery pack does not meet the requirements;

[0080] The control module preliminarily determines that the stability of the battery pack regional environment does not meet the requirements when the fluctuation amplitude of the battery pack output voltage only meets the second fluctuation amplitude condition, and performs a secondary determination on whether the stability of the battery pack regional environment meets the requirements according to the temperature increase rate of the battery pack;

[0081] Among them, the first fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, and the second fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset second fluctuation amplitude.

[0082] It can be understood that the three intervals corresponding to the preset first fluctuation amplitude P1 and the preset second fluctuation amplitude P2 correspond to three situations respectively. The first situation is P≤P1, and the secondary judgment that the energy storage performance of the battery pack meets the requirements; the second situation is P1<P≤P2, there is a battery management system inside the container energy storage system, and the internal high-frequency switching signal will generate electromagnetic interference, causing the battery management system to fail to work normally when managing the battery pack, thereby causing the battery performance to deteriorate; the third situation is P>P2, the heat dissipation channel inside the battery pack is blocked by dust and other substances, and the heat cannot be effectively dissipated, resulting in an increase in the temperature of the battery pack surface. In practice, the range of P1 is generally [2.5V, 3.5V], and the range of P2 is generally [4.5V, 5.5V].

[0083] Preferably, the first fluctuation amplitude P1 is preset to be 3V, and the second fluctuation amplitude P2 is preset to be 5V.

[0084] Specifically, the fluctuation amplitude of the battery pack output voltage is denoted as P.

[0085] Specifically, the calculation formula for the fluctuation range of the battery pack output voltage is:

[0086] P=K1-K2

[0087] Wherein, P is the fluctuation amplitude of the output voltage of the battery pack, K1 is the maximum output voltage of the battery pack within a number of operating cycles, and K2 is the minimum output voltage of the battery pack within a number of operating cycles.

[0088] In implementation, the system of the present invention performs a secondary determination on the energy storage performance of the battery pack by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude, thereby reducing the impact of the reduced effectiveness of the container energy storage process due to inaccurate secondary determination of the energy storage performance of the battery pack, and further improving the effectiveness of the container energy storage process.

[0089] Specifically, the control module increases the gain strength of the filter when the fluctuation amplitude of the output voltage of the battery pack only satisfies the first fluctuation amplitude condition;

[0090] The increase range of the gain strength of the filter is determined by the difference between the fluctuation range of the battery pack output voltage and a preset first fluctuation range.

[0091] Specifically, the calculation formula for the gain strength of the increased filter is:

[0092]

[0093] Among them, H' is the gain strength of the increased filter, H is the current gain strength of the filter, B is the minimum unit fluctuation amplitude for adjusting the gain strength of the filter, and h is the gain strength of the filter when the fluctuation amplitude of the battery pack output voltage is the minimum unit fluctuation amplitude.

[0094] In practice, the value of B is generally 5.5V to 6.5V. Preferably, the preferred embodiment of B is 6V.

[0095] In implementation, the optional range of h is [3dB, 7dB]. Preferably, when the gain strength of the filter is less than 4dB, it may cause degradation of battery performance. Therefore, the preferred embodiment of h is 4dB.

[0096] For example, a container energy storage system based on intelligent monitoring is used to supply power to a port terminal, where H = 3dB, P = 6V, and the calculation result is

[0097] In implementation, the system of the present invention adjusts the gain strength of the filter by setting a preset first fluctuation amplitude and a preset second fluctuation amplitude. Since there is a battery management system inside the container energy storage system, the internal high-frequency switching signal will generate electromagnetic interference, causing the battery management system to be unable to work normally when managing the battery pack, thereby causing the battery performance to deteriorate, thereby causing the fluctuation amplitude of the output voltage to increase. By reducing the gain strength of the filter, the degree of interference of the battery management system due to the high-frequency switching signal is reduced, thereby further achieving an improvement in the effectiveness of the container energy storage process.

[0098] Specifically, when the temperature increase rate of the battery pack is greater than a preset increase rate, the control module secondarily determines that the stability of the battery pack area environment does not meet the requirements, and reduces the discharge rate of the battery pack.

[0099] It can be understood that the two intervals corresponding to the preset increase rate Y0 correspond to two situations. The first situation is Y≤Y0, and the stability of the battery pack area environment meets the requirements; the second situation is Y>Y0, the heat dissipation channel inside the battery pack is blocked by dust and other substances, and the heat cannot be effectively dissipated, resulting in an increase in the temperature of the battery pack surface. In practice, Y0 is generally selected in the range of [1.5℃ / h, 2.5℃ / h].

[0100] Preferably, the preset rising rate Y0=2°C / h.

[0101] Specifically, the temperature increase rate of the battery pack is recorded as Y.

[0102] Specifically, the temperature rise rate of the battery pack is calculated as:

[0103]

[0104] Wherein, Y is the temperature rise rate of the battery pack, S1 is the temperature of the battery pack at the end of a single cycle, S2 is the temperature of the battery pack at the beginning of a single cycle, and T is the duration of a single cycle.

[0105] In implementation, the system of the present invention performs a secondary judgment on the stability of the battery pack area environment by setting a preset increase rate, thereby reducing the impact of the reduced effectiveness of the container energy storage process due to inaccurate secondary judgment on the stability of the battery pack area environment, and further improving the effectiveness of the container energy storage process.

[0106] Specifically, the rate of decrease of the discharge rate of the battery pack is determined by a difference between a temperature increase rate of the battery pack and a preset increase rate.

[0107] Specifically, the calculation formula for the reduced discharge rate of the battery pack is:

[0108]

[0109] Wherein, L' is the reduced discharge rate of the battery pack, L is the current discharge rate of the battery pack, C is the minimum unit increase rate for adjusting the discharge rate of the battery pack, and l is the discharge rate of the battery pack when the temperature increase rate of the battery pack is the minimum unit increase rate.

[0110] In practice, the value of C is generally 2.5°C / h to 3.5°C / h. Preferably, the preferred embodiment of C is 3°C / h.

[0111] In implementation, the optional value range of l is [4KW, 6KW]. Preferably, when the discharge rate of the battery pack is greater than 5KW, it may cause the temperature of the battery pack to rise. Therefore, the preferred embodiment of l is 5KW.

[0112] Specifically, when the value of L' is a decimal, the value of L' is automatically rounded up to an integer.

[0113] For example, a container energy storage system based on intelligent monitoring is used to supply power to a port terminal, where L = 6KW, Y = 4℃ / h, and the calculation is

[0114] In practice, the system of the present invention adjusts the discharge rate of the battery pack by setting a preset increase rate. Since the heat dissipation channels inside the battery pack are blocked by dust and other substances, the heat cannot be effectively dissipated, which causes the temperature of the battery pack surface to rise. By reducing the discharge rate of the battery pack, the energy conversion and heat generation inside the battery pack are reduced, thereby further improving the effectiveness of the container energy storage process.

[0115] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A container energy storage system based on intelligent monitoring, characterized in that: include: An energy storage module, for storing direct current electric energy, comprising a battery pack for storing the direct current electric energy and a filter connected to the battery pack for filtering out high-frequency switching signals in the battery pack; A power supply module, which is connected to the energy storage module and is used to convert the DC power into AC power and then transmit it to the power consumption end; A monitoring module, which is connected to the energy storage module and is used to monitor energy storage operation data; An alarm module, connected to the monitoring module, for issuing an alarm when abnormalities occur in the energy storage operation data; a control module, which is respectively connected to the energy storage module, the power supply module, the monitoring module and the alarm module, and is used to adjust the charging depth of the battery pack or adjust the gain strength of the filter according to the fluctuation amplitude of the output voltage of the battery pack when it is determined that the effectiveness of the container energy storage process does not meet the requirements according to the variance of the output power of the battery pack, and to adjust the discharge rate of the battery pack in combination with the fluctuation amplitude of the output voltage of the battery pack and the temperature rise rate of the battery pack; The abnormality of the energy storage operation data is that the output voltage of the battery pack is greater than the standard output voltage, the temperature of the battery pack is greater than the standard temperature, and the output current of the battery pack is greater than the standard output current; The calculation formula for the reduced depth of charge of the battery pack is: Wherein, V' is the depth of charge of the battery pack after reduction, V is the current depth of charge of the battery pack, A is the minimum unit variance for adjusting the depth of charge of the battery pack, and v is the depth of charge of the battery pack when the variance of the output power of the battery pack is the minimum unit variance; The variance of the output power of the battery pack is recorded as Q, and the preset second variance Q2 = 4KW 2 ; The value of A is 4KW 2 ~6KW 2 ; The value of v is [60%, 80%]; The calculation formula of the gain strength of the increased filter is: Wherein, H' is the gain strength of the increased filter, H is the current gain strength of the filter, B is the minimum unit fluctuation amplitude for adjusting the gain strength of the filter, and h is the gain strength of the filter when the fluctuation amplitude of the battery pack output voltage is the minimum unit fluctuation amplitude; The fluctuation range of the battery pack output voltage is recorded as P, and the preset first fluctuation range P1=3V; The value of B is 5.5V~6.5V; The value of h is [3dB, 7dB]; The calculation formula for the reduced discharge rate of the battery pack is: Wherein, L' is the discharge rate of the battery pack after reduction, L is the current discharge rate of the battery pack, C is the minimum unit increase rate for adjusting the discharge rate of the battery pack, and l is the discharge rate of the battery pack when the temperature increase rate of the battery pack is the minimum unit increase rate; The temperature rise rate of the battery pack is recorded as Y, and the preset rise rate Y0=2°C / h; The value of C is 2.5℃ / h~3.5℃ / h; The value of l is [4KW, 6KW].

2. The container energy storage system based on intelligent monitoring according to claim 1 is characterized in that: The power supply module comprises: an electric energy conversion unit, connected to the filter, for converting the direct current electric energy into alternating current electric energy; A transmission unit is connected to the power conversion unit and is used to transmit the AC power to the power consumption end.

3. The container energy storage system based on intelligent monitoring according to claim 1 is characterized in that: The monitoring module comprises: A voltage sensor, which is arranged at the output end of the battery pack and is used to detect the output voltage of the battery pack; A current sensor, which is arranged at the output end of the battery pack and is used to detect the output current of the battery pack; The temperature sensor is arranged on the surface of the battery pack to detect the temperature of the surface of the battery pack.

4. The container energy storage system based on intelligent monitoring according to claim 1 is characterized in that: The energy storage operation data includes the output voltage of the battery pack, the output power of the battery pack and the output current of the battery pack.

5. The container energy storage system based on intelligent monitoring according to claim 1 is characterized in that: The control module is used to calculate the variance of the output power of the battery pack according to the output voltage and the output current of the battery pack in several monitoring cycles obtained, and to determine that the effectiveness of the container energy storage process does not meet the requirements when the variance of the output power of the battery pack meets the first variance condition or the second variance condition; The first variance condition is that the variance of the output power of the battery pack is greater than a preset first variance and less than or equal to a preset second variance; the second variance condition is that the variance of the output power of the battery pack is greater than the preset second variance.

6. The container energy storage system based on intelligent monitoring according to claim 5 is characterized in that: The control module preliminarily determines that the energy storage performance of the battery pack does not meet the requirements when the variance of the output power of the battery pack only meets the first variance condition, and performs a secondary determination on whether the energy storage performance of the battery pack meets the requirements according to the fluctuation amplitude of the output voltage of the battery pack.

7. The container energy storage system based on intelligent monitoring according to claim 6 is characterized in that: The control module reduces the depth of charge of the battery pack when the variance of the output power of the battery pack only satisfies the second variance condition; The reduction range of the charging depth of the battery pack is determined by the difference between the variance of the output power of the battery pack and a preset second variance.

8. The container energy storage system based on intelligent monitoring according to claim 7 is characterized in that: The control module secondarily determines that the energy storage performance of the battery pack does not meet the requirements when the fluctuation amplitude of the output voltage of the battery pack meets the first fluctuation amplitude condition or the second fluctuation amplitude condition; The control module preliminarily determines that the stability of the battery pack regional environment does not meet the requirements when the fluctuation amplitude of the battery pack output voltage only meets the second fluctuation amplitude condition, and performs a secondary determination on whether the stability of the battery pack regional environment meets the requirements according to the temperature increase rate of the battery pack; Among them, the first fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset first fluctuation amplitude and less than or equal to the preset second fluctuation amplitude, and the second fluctuation amplitude condition is that the fluctuation amplitude of the battery pack output voltage is greater than the preset second fluctuation amplitude.

9. The container energy storage system based on intelligent monitoring according to claim 8 is characterized in that: The control module increases the gain strength of the filter when the fluctuation amplitude of the output voltage of the battery pack only satisfies the first fluctuation amplitude condition; The increase range of the gain strength of the filter is determined by the difference between the fluctuation range of the battery pack output voltage and a preset first fluctuation range.

10. The container energy storage system based on intelligent monitoring according to claim 9 is characterized in that: The control module secondarily determines that the stability of the battery pack area environment does not meet the requirements when the temperature increase rate of the battery pack is greater than the preset increase rate, and reduces the discharge rate of the battery pack; The rate of decrease of the discharge rate of the battery pack is determined by the difference between the temperature increase rate of the battery pack and a preset increase rate.

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