Temperature control device and method for battery energy storage cabinet

Abstract

The application relates to the technical field of battery energy storage, and discloses a temperature control device and method for a group string type energy storage cabinet. The temperature control device of the energy storage cabinet comprises a first comparison unit, a second comparison unit and a total comparison unit, a plurality of energy storage modules are integrated in the energy storage cabinet, each energy storage module is provided with the first and second comparison units, and the first and second comparison units are connected with the total comparison unit. The current and voltage sampling units of the energy storage modules collect current values and voltage values, which are transmitted to the first comparison unit; a temperature sensor collects temperature values, which are transmitted to the second comparison unit; the comparison units send the operating power and temperature values of the energy storage modules to the total comparison unit; the total comparison unit obtains the control voltage value of a fan according to the double judgment conditions of the operating power value and the temperature value, so as to control the rotating speed of the fan; the rotating speed of the fan is maximally reduced on the basis of meeting the heat dissipation of the energy storage modules, so that the energy loss is reduced.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of battery energy storage, and more particularly to a temperature control device and method for a string-type energy storage cabinet. Background Art

[0002] A battery energy storage system (BESS) is composed of a large number of highly integrated battery modules. Heat accumulation during system operation can cause localized temperature increases, directly impacting the safety and reliability of energy storage system applications.

[0003] Current energy storage systems use air cooling to dissipate heat. To achieve energy conservation and consumption reduction, most existing solutions use variable frequency fans, which achieve this goal by adjusting the fan speed.

[0004] For example, Chinese patent publication number CN113757152A, "An Auxiliary Energy Storage Module Fan Speed ​​Control Circuit and Control," discloses a method for acquiring a radiator temperature signal T to adjust the pulse signal output by a pulse generation unit, thereby generating a DC voltage signal for stepless fan speed control. In this technical solution, the radiator temperature acquisition unit alone collects the temperature signal, transmits it to a pulse distribution board for calculation, and then outputs a control voltage for the fan speed.

[0005] The inventors of this application have discovered that the aforementioned patent solution regulates fan speed for a single energy storage module. However, due to the large number of fans in the energy storage system cabinet integrated with multiple energy storage modules, heat accumulation is prone to occur after a failure of an individual fan. Furthermore, in the IGBT (insulated gate bipolar transistor) modules currently produced by mainstream manufacturers, the temperature sensor is located far away from the core heating area of ​​the IGBT and anti-parallel diode in the IGBT power module. Therefore, the temperature sensor cannot accurately obtain the true junction temperature of the IGBT and diode in the IGBT power module. As a result, the energy storage system cabinet after the energy storage modules are integrated cannot dissipate heat in a timely and reliable manner, resulting in the thermal power exceeding the heat dissipation power. In severe cases, the IGBT module may even overheat and explode. Summary of the Invention

[0006] The object of the present invention is to provide a temperature control device and method for a string-type energy storage cabinet to solve the problems in the above-mentioned background technology.

[0007] An embodiment of the present invention provides a temperature control device for a string energy storage cabinet, which is used to control the speed of a cooling fan of the energy storage cabinet, including: a first comparison unit, a second comparison unit and a total comparison unit;

[0008] The energy storage cabinet is integrated with multiple energy storage modules, each of which includes: an A-phase IGBT, a B-phase IGBT, a C-phase IGBT, a temperature sensor, a current sampling unit, a voltage sampling unit, a filter inductor, a filter capacitor and an AC switch;

[0009] Each of the energy storage modules is provided with the first comparison unit and the second comparison unit, the current sampling unit and the voltage sampling unit of each of the energy storage modules are connected to the first comparison unit in the module, and the temperature sensor of each of the energy storage modules is connected to the second comparison unit in the module;

[0010] The current sampling unit of each energy storage module is used to collect the current values ​​of the A-phase, B-phase and C-phase IGBTs in the module and transmit the current values ​​to the first comparison unit in the module; the voltage sampling unit of each energy storage module is used to collect the voltage values ​​of the A-phase, B-phase and C-phase IGBTs in the module and transmit the voltage values ​​to the first comparison unit in the module;

[0011] The temperature sensor of each energy storage module is used to collect the temperature values ​​of the A-phase, B-phase and C-phase IGBTs in the module and transmit the temperature values ​​to the second comparison unit;

[0012] All first comparison units and second comparison units are respectively connected to the total comparison unit, the first comparison unit is used to output the operating power of the corresponding energy storage module to the total comparison unit, and the second comparison unit is used to output the temperature value of the corresponding energy storage module to the total comparison unit. The total comparison unit is used to obtain a control voltage value based on the received operating power value and temperature value, and transmit the control voltage value to the fan speed regulation module to control the fan speed.

[0013] Based on the above scheme, it can be seen that the temperature control device of the string energy storage cabinet of the present invention is provided with a first comparison unit, a second comparison unit, and a total comparison unit. The energy storage cabinet integrates multiple energy storage modules, each of which includes: an A-phase IGBT, a B-phase IGBT, a C-phase IGBT, a temperature sensor, a current sampling unit, a voltage sampling unit, a filter inductor, a filter capacitor, and an AC switch. Each energy storage module is provided with a first comparison unit and a second comparison unit. The current sampling unit and the voltage sampling unit are both connected to the first comparison unit within the module, and the temperature sensor is connected to the second comparison unit within the module. All first comparison units and second comparison units are respectively connected to the total comparison unit. In the temperature control device of the string energy storage cabinet of the present invention, the current sampling unit and the voltage sampling unit of each energy storage module collect the current and voltage values ​​of the three phases of the A-phase, B-phase, and C-phase IGBTs and transmit them to the corresponding first comparison unit. The temperature sensor collects the temperature value and transmits it to the second comparison unit. The first comparison unit transmits the operating power of each energy storage module to the total comparison unit, and the second comparison unit transmits the temperature value of each energy storage module to the total comparison unit. The total comparison unit receives the operating power and temperature values ​​of each energy storage unit, performs control logic operations, and calculates the fan control voltage value. This control voltage value is then transmitted to the fan speed control module to control the fan speed. Based on the dual judgment criteria of the operating power and temperature values ​​of each energy storage unit, the total comparison unit can pre-identify the heat accumulation of each energy storage module and control the fan speed by outputting a control voltage value to dissipate heat from the energy storage modules within the energy storage cabinet. This prevents delayed operation of the cooling fan due to untimely temperature sensor sampling, which in turn causes delayed heat dissipation of the energy storage modules. This ensures the safe operation of the energy storage system and minimizes fan speed while ensuring heat dissipation of the energy storage modules, thereby reducing energy loss.

[0014] In a feasible solution, the fan is a suction centrifugal fan.

[0015] In a feasible solution, a plurality of the energy storage modules are stacked up and down and arranged in an energy storage cabinet;

[0016] The energy storage cabinet is provided with a directional air inlet and a heat dissipation duct;

[0017] One end of the energy storage module is open to the directional air inlet, and the other end thereof is connected to the heat dissipation duct;

[0018] The air exhaust port of the fan is connected to the heat dissipation duct for absorbing heat.

[0019] In a feasible solution, the temperature sensor is an NTC temperature sensor.

[0020] In a feasible solution, the second comparison unit transmits the maximum temperature values ​​of the A-phase, B-phase, and C-phase IGBTs to the overall comparison unit.

[0021] An embodiment of the present invention further provides a temperature control method for the temperature control device in the above design, comprising the following steps:

[0022] S1 The current sampling unit of each energy storage module collects the current values ​​ia, ib and ic of the A-phase, B-phase and C-phase IGBTs, and the voltage sampling unit collects the three-phase line voltage values ​​uab, ubc and uca of the A-phase, B-phase and C-phase IGBTs, and transmits the collected current values ​​and voltage values ​​to the first comparison unit in the module respectively;

[0023] S2: the first comparison unit of each energy storage module obtains the operating power of each energy storage module and sends the operating power to the overall comparison unit;

[0024] The S3 total comparison unit obtains the operating power P1 to PX of all energy storage modules and takes the maximum operating power P of all energy storage modules. max , the power ratio is calculated as:

[0025] D=P max / P n *100%

[0026] Where D is the power ratio, P max is the maximum operating power of each energy storage module, P n is the rated power of a single energy storage module;

[0027] S4 The temperature sensor of each energy storage module collects the temperatures TA, TB and TC of the A-phase, B-phase and C-phase IGBTs and transmits the temperature values ​​to the second comparison unit in the module;

[0028] S5 The second comparison unit in each energy storage module compares the temperatures of the A-phase, B-phase, and C-phase IGBTs, and sends the maximum temperature value Tntc among the three phases to the overall comparison unit;

[0029] S6 The total comparison unit obtains the temperature values ​​Tntc1 to Tntcx of all energy storage modules and takes the maximum temperature T max ;

[0030] S7 total comparison unit according to the power ratio D and the maximum temperature T max , calculate the fan control voltage value;

[0031] The S8 total comparison unit sends the control voltage value to the fan speed regulation module to control the fan speed.

[0032] In a feasible solution, in step S7, the process of the total comparison unit obtaining the fan control voltage is as follows:

[0033] S71 is the maximum operating power P max If it is not equal to zero, the total comparison unit will obtain the control voltage value of the fan according to the following conditions:

[0034] If D<D1, continue to determine the maximum temperature T max , if T max <T1, then the output control voltage value is 0. If T max ≥T1, then the output control voltage V1;

[0035] If D1≤D<D2, continue to determine the maximum temperature T max , if T max <T1, then the output control voltage value V1, if T1≤T max <T2, then the output control voltage V2, if T max ≥T2, then the output control voltage value is V3;

[0036] If D≥D2, the output control voltage value is V3;

[0037] S72 is the maximum value of the operating power P max If it is equal to zero, the total comparison unit obtains the control voltage value of the fan according to the following conditions:

[0038] If T max <T1, then the output control voltage value is 0. If T max ≥T1, the output control voltage value is V1.

[0039] In one feasible solution, the value of D1 is 20% and the value of D2 is 80%;

[0040] The value of T1 is 40°C, and the value of T2 is 80°C;

[0041] The value of V1 is 2V, the value of V2 is 6V, and the value of V3 is 10V.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. Multiple energy storage modules are integrated in the energy storage cabinet. The heat dissipation ducts of the energy storage cabinet are merged into one, and the fan is set at the end of the heat dissipation duct, reducing the number of fans and the floor space occupied.

[0044] 2. Based on the dual judgment conditions of the operating power value and operating temperature value of each energy storage unit, the total comparison unit can identify the heat accumulation of each energy storage module in advance, avoid the heat dissipation delay of the energy storage module due to untimely sampling of the temperature sensor, ensure the safe operation of the system, and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0046] Figure 1 Schematic diagram of the temperature control principle of the temperature control device of the string-type energy storage cabinet in the first embodiment of the present invention;

[0047] Figure 2 Schematic diagram of the energy storage cabinet in the first embodiment of the present invention;

[0048] Figure 3 Schematic diagram of the logic flow of the temperature control method in the second embodiment of the present invention.

[0049] Numbers in the figure:

[0050] 100. Energy storage cabinet; 101. First comparison unit; 102. Second comparison unit; 103. Temperature sensor; 104. Current sampling unit; 105. Voltage sampling unit; 11. Directional air inlet; 12. Cooling duct; 200. Total comparison unit; 300. Fan. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] In the present invention, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," "fixed," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise expressly specified or limited. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0054] The following specific embodiments are used to describe the technical solution of the present invention in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0055] As described in the background of this application, battery energy storage systems are composed of a large number of battery energy storage modules and are highly integrated. During system operation, heat buildup in the battery energy storage system cabinets can cause localized temperature increases, directly impacting the safety and reliability of energy storage system applications.

[0056] The inventors of the present application have discovered that, in current energy storage systems, multiple energy storage modules are combined in a cabinet, which increases the number of fans and results in a non-compact structure. To reduce energy consumption, when controlling the fan speed, only the temperature signal is collected by the heat sink temperature acquisition unit to thereby control the output voltage of the fan speed. However, since the number of fans in the energy storage system cabinet integrated with the multiple energy storage modules is too large, heat accumulation is prone to occur after a failure of an individual fan. Furthermore, the temperature sensor is located far from the core heating area of ​​the IGBT and the reverse-parallel diode in the IGBT power module. Therefore, the temperature sensor cannot accurately obtain the actual junction temperature of the IGBT and the diode in the IGBT power module. As a result, the energy storage system cabinet after the energy storage modules are integrated suffers from the problem of being unable to dissipate heat in a timely and reliable manner.

[0057] In order to solve the above problems, the inventors of this application have proposed the technical solution of this application, and the specific embodiments are as follows:

[0058] Example 1

[0059] Figure 1 Schematic diagram of the temperature control principle of the temperature control device of the string energy storage cabinet in the first embodiment of the present invention. Figure 2 Schematic diagram of the energy storage cabinet in embodiment 1 of the present invention.

[0060] like Figure 1 and Figure 2As shown, the temperature control device of the string energy storage cabinet of this embodiment is used to control the speed of the cooling fan of the energy storage cabinet and minimize the fan speed on the basis of meeting the heat dissipation requirements of the energy storage cabinet, thereby reducing operating energy loss.

[0061] The energy storage cabinet 100 integrates multiple (X) energy storage modules, labeled Energy Storage Module 1, Energy Storage Module 2, and so on. Each energy storage module includes: Phase A IGBT, Phase B IGBT, Phase C IGBT, temperature sensor 103, current sampling unit 104, voltage sampling unit 105, filter inductor L, filter capacitor C, and AC switch QF. The current sampling unit 104 of the energy storage module is used to collect the current values ​​of the Phase A IGBT, Phase B IGBT, and Phase C IGBT, while the voltage sampling unit 105 is used to collect the voltage values ​​of the Phase A IGBT, Phase B IGBT, and Phase C IGBT. The filter inductor L and filter capacitor C are installed in the current and voltage collection circuits. The temperature sensor 103 is used to collect the temperature values ​​of the Phase A IGBT, Phase B IGBT, and Phase C IGBT. This is the traditional hardware configuration of the energy storage module.

[0062] The temperature control device includes a first comparison unit 101 , a second comparison unit 102 and a total comparison unit 200 .

[0063] Each energy storage module is equipped with a first comparison unit 101 and a second comparison unit 102. These first and second comparison units 101, 102 are built into each energy storage module and serve as built-in computing units. The current sampling unit 104 and voltage sampling unit 105 of each energy storage module are connected to the first comparison unit 101 within the corresponding module, and the temperature sensor 103 within each energy storage module is connected to the second comparison unit 102 within the corresponding module.

[0064] The total comparison unit 200 is integrated in the energy storage cabinet 100 and is a built-in computing unit of the energy storage cabinet 100. The first comparison unit 101 and the second comparison unit 102 in each energy storage module are respectively connected to the total comparison unit 200, and the total comparison unit 200 is connected to the fan speed control module.

[0065] In this embodiment, the current sampling unit of each energy storage module collects the current values ​​of the A-phase, B-phase, and C-phase IGBTs of the corresponding energy storage module. These collected current values ​​are filtered and transmitted to the first comparison unit within the corresponding module. The voltage sampling unit collects the voltage values ​​of the A-phase, B-phase, and C-phase IGBTs of the corresponding energy storage module. These collected voltage values ​​are also filtered and transmitted to the first comparison unit within the corresponding module. The first comparison unit of each energy storage module calculates the operating power of each energy storage module and transmits the operating power of each energy storage module to the master comparison unit.

[0066] The temperature sensor of each energy storage module collects the temperature values ​​of the A-phase, B-phase, and C-phase IGBTs of the corresponding energy storage module. The collected temperature values ​​are filtered and transmitted to the second comparison unit in the corresponding module. The second comparison unit transmits the temperature value of each energy storage module to the overall comparison unit.

[0067] The total comparison unit obtains the control voltage value of the fan 300 after control logic operation based on the operating power value and temperature value of each energy storage unit received. The total comparison unit transmits the control voltage value to the fan speed regulation module to control the fan speed.

[0068] From the foregoing, it is readily apparent that the temperature control device for the string energy storage cabinet of this embodiment incorporates a first comparison unit, a second comparison unit, and a master comparison unit. Multiple energy storage modules are integrated within the energy storage cabinet, each comprising: an A-phase IGBT, a B-phase IGBT, a C-phase IGBT, a temperature sensor, a current sampling unit, a voltage sampling unit, a filter inductor, a filter capacitor, and an AC switch. Each energy storage module is provided with a first comparison unit and a second comparison unit. Both the current sampling unit and the voltage sampling unit are connected to the first comparison unit within the module, while the temperature sensor is connected to the second comparison unit within the module. All first and second comparison units are respectively connected to the master comparison unit. In the temperature control device for the string energy storage cabinet of this embodiment, the current sampling unit and the voltage sampling unit of each energy storage module collect the current and voltage values ​​of the A-phase, B-phase, and C-phase IGBTs and transmit them to the corresponding first comparison unit. The temperature sensor collects the temperature value and transmits it to the second comparison unit. The first comparison unit transmits the operating power of each energy storage module to the master comparison unit, while the second comparison unit transmits the temperature value of each energy storage module to the master comparison unit. The total comparison unit receives the operating power and temperature values ​​of each energy storage unit, performs control logic operations, and calculates the fan control voltage value. This control voltage value is then transmitted to the fan speed control module to control the fan speed. Based on the dual judgment criteria of the operating power and temperature values ​​of each energy storage unit, the total comparison unit can pre-identify the heat accumulation of each energy storage module and control the fan speed by outputting a control voltage value to dissipate heat from the energy storage modules within the energy storage cabinet. This prevents delayed operation of the cooling fan due to untimely temperature sensor sampling, which in turn causes delayed heat dissipation of the energy storage modules. This ensures the safe operation of the energy storage system and minimizes fan speed while ensuring heat dissipation of the energy storage modules, thereby reducing energy loss.

[0069] Optionally, in the temperature control device of the string energy storage cabinet in this embodiment, the fan 300 is a suction centrifugal fan.

[0070] Furthermore, in the temperature control device of the string-type energy storage cabinet in this embodiment, multiple energy storage modules are stacked up and down in the energy storage cabinet 100 and arranged along the cabinet depth direction of the energy storage cabinet 100.

[0071] The energy storage cabinet 100 is provided with a directional air inlet 11 on the air inlet end face of each energy storage module, and a heat dissipation duct 12 on the air outlet end face of the energy storage module. The air outlet end face of the energy storage module is connected to the heat dissipation duct 12.

[0072] A centrifugal fan 300 is positioned at the end of the cooling duct 12, with its exhaust port connected to the duct. During operation, the centrifugal fan evenly draws heat away from each energy storage module. In this embodiment, only one fan is required, and its speed can be controlled to effectively dissipate heat from all energy storage modules in the entire energy storage cabinet. This results in a compact structure and minimal space consumption.

[0073] Optionally, in the temperature control device of the string energy storage cabinet in this embodiment, the temperature sensor 103 adopts an NTC temperature sensor, which has the advantages of high sensitivity, fast response speed, good consistency and interchangeability.

[0074] Optionally, in the temperature control device of the string energy storage cabinet in this embodiment, the temperature sensor 103 of each energy storage module collects the temperature values ​​of the A-phase, B-phase and C-phase IGBTs of the corresponding energy storage module, and the collected temperature values ​​are transmitted to the second comparison unit 102 of the corresponding module after filtering.

[0075] After comparing the temperature values ​​of the three-phase IGBTs, the second comparison unit 102 transmits the maximum temperature value among the three-phase IGBTs of the energy storage module to the overall comparison unit 200 .

[0076] Example 2

[0077] Figure 3 Schematic diagram of the logic flow of the temperature control method in the second embodiment of the present invention.

[0078] like Figure 3 As shown, the control method of the temperature control device in this embodiment based on the above embodiment includes the following steps:

[0079] S1 The current sampling unit 104 of each energy storage module collects the current values ​​ia, ib and ic of the A-phase, B-phase and C-phase IGBTs, and the voltage sampling unit 105 of each energy storage module collects the voltage values ​​uab, ubc and uca of the A-phase, B-phase and C-phase IGBTs, and transmits the collected current values ​​and voltage values ​​to the first comparison unit 101 in the corresponding module respectively.

[0080] S2 The first comparison unit 101 of each energy storage module obtains the operating power of each energy storage module after calculation, which is marked as P1, P2, and so on to PX. Then, the first comparison unit 101 of each energy storage module sends the operating power of the energy storage module to the total comparison unit 200.

[0081] S3 The total comparison unit 200 obtains the operating powers P1 to PX of all energy storage modules, and then takes the maximum value P of the operating powers of all energy storage modules. max , that is, P max =max[P1, P2, ..., PX], and calculate the power ratio:

[0082] D=P max / P n *100%

[0083] Where D is the power ratio, P max is the maximum operating power of each energy storage module, P n is the rated power of a single energy storage module (the rated power of all energy storage modules is the same).

[0084] S4: The temperature sensor 103 of each energy storage module collects the temperatures TA, TB and TC of the A-phase, B-phase and C-phase IGBTs, and transmits the temperature values ​​to the second comparison unit 102 of the corresponding energy storage module after filtering.

[0085] S5: The second comparison unit 102 of each energy storage module compares the temperature values ​​of the A-phase, B-phase, and C-phase IGBTs and sends the maximum temperature value Tntc among the three phases as the operating temperature of the energy storage module to the overall comparison unit 200. That is, Tntc1 = max[T1-A, T1-B, T1-C], Tntc2 = max[T2-A, T2-B, T2-C], and so on until TntcX = max[TX-A, TX-B, TX-C].

[0086] S6 The total comparison unit 200 obtains the temperature values ​​Tntc1 to TntcX of all energy storage modules and takes the maximum temperature T max , that is, T max =max[Tntc1, Tntc2,...,TntcX].

[0087] S7 The total comparison unit 200 calculates the power ratio D and the maximum temperature T according to the obtained power ratio D and the maximum temperature T max , and the control voltage value of the fan is obtained after logical operation.

[0088] S8: The total comparison unit 200 sends the control voltage value to the fan speed regulation module, thereby controlling the fan speed.

[0089] Furthermore, in the control method of the temperature control device in this embodiment, in step S7, the total comparison unit 200 obtains the calculation and judgment process of the fan control voltage as follows:

[0090] S71 If the maximum operating power of each energy storage module is not equal to zero (P max≠0), that is, the energy storage module is in operation, then the total comparison unit 200 calculates the control voltage value of the fan according to the following conditions:

[0091] If D<D1(20%), continue to judge the maximum temperature T max , if T max <T1(40℃), then the output control voltage value is 0. If T max ≥T1(40℃), the output control voltage is V1(2V).

[0092] If D1(20%)≤D<D2(80%), then continue to determine the maximum temperature T max , if T max <T1(40℃), then the output control voltage value is V1(2V); if T1(40℃)≤T max <T2(80℃), then the output control voltage is V2(6V); T max ≥T2(80℃), the output control voltage value is V3(10V).

[0093] If D≥D2 (80%), the output control voltage value is V3 (10V).

[0094] S72 If the maximum operating power of each energy storage module is equal to zero (P max =0), that is, the energy storage module is in a non-operating state, the total comparison unit 200 obtains the control voltage value of the fan according to the following conditions:

[0095] If T max <T1(40℃), the output control voltage value is 0; if T max ≥T1(40℃), output control voltage value V1(2V).

[0096] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium.

[0097] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0098] In the description of this specification, reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A temperature control method for a string energy storage cabinet, based on a temperature control device for the energy storage cabinet, for controlling the speed of a cooling fan of the energy storage cabinet, wherein the temperature control device comprises: a first comparison unit, a second comparison unit, and a total comparison unit; The energy storage cabinet is integrated with multiple energy storage modules, each of which includes: an A-phase IGBT, a B-phase IGBT, a C-phase IGBT, a temperature sensor, a current sampling unit, a voltage sampling unit, a filter inductor, a filter capacitor and an AC switch; Each of the energy storage modules is provided with the first comparison unit and the second comparison unit, the current sampling unit and the voltage sampling unit of each of the energy storage modules are connected to the first comparison unit in the module, and the temperature sensor of each of the energy storage modules is connected to the second comparison unit in the module; A plurality of the energy storage modules are stacked up and down and arranged in the energy storage cabinet; The energy storage cabinet is provided with a directional air inlet and a heat dissipation duct; One end of the energy storage module is open to the directional air inlet, and the other end thereof is connected to the heat dissipation duct; The air outlet of the fan is connected to the heat dissipation duct for extracting heat; All the first comparison units and the second comparison units are respectively connected to the overall comparison unit; It is characterized in that the temperature control method comprises the following steps: S1 The current sampling unit of each energy storage module collects the current values ​​ia, ib and ic of the A-phase, B-phase and C-phase IGBTs, and the voltage sampling unit collects the three-phase line voltage values ​​uab, ubc and uca of the A-phase, B-phase and C-phase IGBTs, and transmits the collected current values ​​and voltage values ​​to the first comparison unit in the module respectively; S2: the first comparison unit of each energy storage module obtains the operating power of each energy storage module and sends the operating power to the overall comparison unit; S3 The total comparison unit obtains the operating power P1 to PX of all energy storage modules and takes the maximum operating power P of all energy storage modules. max , the power ratio is calculated as: D=P max / P n *100% Where D is the power ratio, P max is the maximum operating power of each energy storage module, P n is the rated power of a single energy storage module; S4 The temperature sensor of each energy storage module collects the temperatures TA, TB and TC of the A-phase, B-phase and C-phase IGBTs and transmits the temperature values ​​to the second comparison unit in the module; S5: The second comparison unit in each energy storage module compares the temperature values ​​of the A-phase, B-phase, and C-phase IGBTs, and sends the maximum temperature value Tntc among the three phases to the overall comparison unit; S6 The total comparison unit obtains the temperature values ​​Tntc1 to Tntcx of all energy storage modules and takes the maximum temperature T max ; S7 total comparison unit according to the power ratio D and the maximum temperature T max , calculate the fan control voltage value, including: S71 is the maximum operating power P max If it is not equal to zero, the total comparison unit will obtain the control voltage value of the fan according to the following conditions: If D<D1, continue to determine the maximum temperature T max , if T max <T1, then the output control voltage value is 0. If T max ≥T1, then the output control voltage V1; If D1≤D<D2, continue to determine the maximum temperature T max , if T max <T1, then the output control voltage value V1, if T1≤T max <T2, then the output control voltage V2, if T max ≥T2, then the output control voltage value is V3; If D≥D2, the output control voltage value is V3; S72 is the maximum operating power P max If it is equal to zero, the total comparison unit obtains the control voltage value of the fan according to the following conditions: If T max <T1, then the output control voltage value is 0. If T max ≥T1, then the output control voltage value is V1; The S8 total comparison unit sends the control voltage value to the fan speed control module to control the fan speed.

2. The temperature control method of a string energy storage cabinet according to claim 1, characterized in that: The fan is a suction type centrifugal fan.

3. The temperature control method of a string energy storage cabinet according to claim 1, characterized in that: The temperature sensor is an NTC temperature sensor.

4. The temperature control method for a string energy storage cabinet according to claim 1, characterized in that: The second comparison unit transmits the maximum temperature values ​​of the A-phase, B-phase, and C-phase IGBTs to the overall comparison unit.

5. The temperature control method of a string energy storage cabinet according to claim 1, characterized in that: The value of D1 is 20%, and the value of D2 is 80%; The value of T1 is 40°C, and the value of T2 is 80°C; The value of V1 is 2V, the value of V2 is 6V, and the value of V3 is 10V.

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