Temperature control device and method of string type energy storage cabinet

Abstract

The invention relates to the technical field of battery energy storage, and discloses a temperature control device and method for a 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 comparison unit and the second comparison unit, and the first comparison unit and the second comparison unit are connected with the total comparison unit. According to the temperature control device of the energy storage cabinet, a current and voltage sampling unit of an energy storage module collects a current value and a voltage value and transmits the current value and the voltage value to a first comparison unit, a temperature sensor collects a temperature value and transmits the temperature value to a second comparison unit, and the comparison units send the operation power and the temperature value of the energy storage module to a total comparison unit; the total comparison unit obtains a control voltage value of the fan according to double judgment conditions of the operation power value and the temperature value so as to control the rotating speed of the fan, the rotating speed of the fan is reduced to the maximum extent on the basis of meeting heat dissipation of the energy storage module, and therefore energy loss is reduced.

Description

Technical Field

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

[0002] The battery energy storage system (BESS) is composed of a large number of battery energy storage modules with high integration. When the system is running, heat accumulation will cause a sharp increase in local temperature, which will directly affect the safety and reliability of the energy storage system application.

[0003] The current energy storage system uses air cooling to dissipate heat. In order to achieve energy saving and consumption reduction, most existing solutions use variable frequency fans to achieve the purpose of energy saving and consumption reduction by adjusting the fan speed.

[0004] For example, the Chinese patent "An auxiliary energy storage module fan speed control circuit and control" with publication number CN113757152A discloses that the pulse signal output by the pulse generating unit is adjusted by collecting the temperature signal T of the radiator, and then a DC voltage signal is generated to perform stepless speed control on the fan. In its technical solution, the temperature signal is only collected by the radiator temperature collection unit, transmitted to the pulse distribution board for calculation, and then the control voltage of the fan speed is output.

[0005] The inventor of the present application has discovered that the above-mentioned patent solution performs fan speed regulation for a single energy storage module. Since the number of fans in the energy storage system cabinet integrated with multiple energy storage modules is too large, heat accumulation is prone to occur after a failure of an individual fan. Moreover, for the IGBT (insulated gate bipolar transistor) modules of the current mainstream manufacturers, the location of the temperature sensor is far away 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 true junction temperature of the IGBT and the diode in the IGBT power module. Therefore, the energy storage system cabinet after the energy storage module is integrated cannot dissipate heat in a timely and reliable manner, which will cause the thermal power to exceed 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] The embodiment of the present invention provides a temperature control device for a string energy storage cabinet, which is used to control the rotation speed of a cooling fan of the energy storage cabinet, and includes: a first comparison unit, a second comparison unit and a total comparison unit;

[0008] The energy storage cabinet is integrated with a plurality of 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 the first comparison units and the 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, the second comparison unit is used to output the temperature value of the corresponding energy storage module to the total comparison unit, and the total comparison unit is used to obtain a control voltage value according to 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 known 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, and a plurality of energy storage modules are integrated in the energy storage cabinet, and each energy storage module includes: A-phase IGBT, B-phase IGBT, C-phase IGBT, temperature sensor, current sampling unit, voltage sampling unit, filter inductor, filter capacitor and AC switch, and each energy storage module is provided with a first comparison unit and a second comparison unit, and the current sampling unit and the voltage sampling unit are both connected to the first comparison unit in the module, and the temperature sensor is connected to the second comparison unit in the module, and all the first comparison units and the 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 value and voltage value of the three phases of the A-phase, B-phase and C-phase IGBT, 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 sends 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 obtains the control voltage value of the fan after control logic operation based on the operating power value and temperature value of each energy storage unit received, and transmits the control voltage value to the fan speed control module to control the fan speed. The total comparison unit can identify the heat accumulation of each energy storage module in advance based on the dual judgment conditions of the operating power value and temperature value of each energy storage unit, and control the fan speed by outputting the control voltage value to dissipate the heat of the energy storage module in the energy storage cabinet, avoiding the lagging action of the heat dissipation fan due to untimely sampling of the temperature sensor, and causing the heat dissipation hysteresis of the energy storage module, ensuring the safe operation of the energy storage system, and minimizing the fan speed on the basis of satisfying the heat dissipation of the energy storage module, 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 opposite thereto is connected to the heat dissipation air duct;

[0018] The air outlet 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] The embodiment of the present invention further provides a temperature control method of 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 total 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 total 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 of all energy storage modules. 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 control 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 value of the operating power P max If it is not equal to zero, the total comparison unit obtains 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, the output control voltage value is 0. If T max ≥T1, then the output control voltage is 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, 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 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, 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 floor space.

[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 briefly introduces 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 creative labor.

[0046] Figure 1 This is a 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 an energy storage cabinet in Embodiment 1 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, heat dissipation duct; 200, total comparison unit; 300, fan. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are 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, and do not indicate or imply 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 a limitation on the present invention.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] The technical solution of the present invention is described in detail with specific embodiments below. 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, the battery energy storage system is composed of a large number of battery energy storage modules with high integration. When the system is running, the heat accumulation in the battery energy storage system cabinet will cause a sharp increase in local regional temperature, which directly affects the safety and reliability of the energy storage system application.

[0056] The inventors of the present application have discovered that, in the current energy storage system, a plurality of energy storage modules are combined in a cabinet, which increases the number of fans and causes a non-compact structure. In order to reduce energy consumption, when controlling the fan speed, only the temperature signal is collected by the heat sink temperature collection unit to control the output voltage of the fan speed. Since the number of fans in the energy storage system cabinet integrated with the plurality of energy storage modules is too large, heat accumulation is prone to occur after a failure of an individual fan. Moreover, the position of the temperature sensor is far away 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 true junction temperature of the IGBT and the diode in the IGBT power module. Therefore, the energy storage system cabinet after the energy storage module is integrated has the problem of not being able to dissipate heat in a timely and reliable manner.

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

[0058] Embodiment 1

[0059] 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, Figure 2 Schematic diagram of the energy storage cabinet in the first embodiment 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 on the basis of meeting the heat dissipation requirements of the energy storage cabinet, minimize the fan speed, thereby reducing operating energy loss.

[0061] The energy storage cabinet 100 integrates multiple (X) energy storage modules, and the X energy storage modules are respectively marked as: energy storage module 1, energy storage module 2, and up to energy storage module X. Each energy storage module includes: A-phase IGBT, B-phase IGBT, C-phase 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 value of A-phase IGBT, B-phase IGBT, and C-phase IGBT, the voltage sampling unit 105 is used to collect the voltage value of A-phase IGBT, B-phase IGBT, and C-phase IGBT, and the filter inductor L and filter capacitor C are set on the current and voltage collection circuit; the temperature sensor 103 is used to collect the temperature value of A-phase IGBT, B-phase IGBT, and C-phase IGBT. This is the traditional hardware configuration of the current 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 provided with a first comparison unit 101 and a second comparison unit 102, which are built into each energy storage module and are built-in computing units for each energy storage module. The current sampling unit 104 and the voltage sampling unit 105 of each energy storage module are connected to the first comparison unit 101 in the corresponding module, and the temperature sensor 103 in each energy storage module is connected to the second comparison unit 102 in 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, and the collected current values ​​are transmitted to the first comparison unit in the corresponding module after filtering; the voltage sampling unit collects the voltage values ​​of the A-phase, B-phase and C-phase IGBTs of the corresponding energy storage module, and the collected voltage values ​​are also transmitted to the first comparison unit in the corresponding module after filtering. The first comparison unit of each energy storage module obtains the operating power of each energy storage module through calculation, and the first comparison unit sends the operating power of each energy storage module to the total 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, and transmits the collected temperature values ​​to the second comparison unit in the corresponding module after filtering. The second comparison unit transmits the temperature value of each energy storage module to the total comparison unit.

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

[0068] It is not difficult to find from the above content that the temperature control device of the string energy storage cabinet of this embodiment, by setting the first comparison unit, the second comparison unit and the total comparison unit, the energy storage cabinet integrates multiple energy storage modules, each energy storage module includes: A-phase IGBT, B-phase IGBT, C-phase IGBT, temperature sensor, current sampling unit, voltage sampling unit, filter inductor, filter capacitor and AC switch, and 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 connected to the first comparison unit in the module, the temperature sensor is connected to the second comparison unit in the module, and all the first comparison units and the second comparison units are respectively connected to the total comparison unit. In the temperature control device of 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 value and voltage value of the A-phase, B-phase and C-phase IGBT, 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 sends 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 obtains the control voltage value of the fan after control logic operation based on the operating power value and temperature value of each energy storage unit received, and transmits the control voltage value to the fan speed control module to control the fan speed. The total comparison unit can identify the heat accumulation of each energy storage module in advance based on the dual judgment conditions of the operating power value and temperature value of each energy storage unit, and control the fan speed by outputting the control voltage value to dissipate the heat of the energy storage module in the energy storage cabinet, avoiding the lagging action of the heat dissipation fan due to untimely sampling of the temperature sensor, and causing the heat dissipation hysteresis of the energy storage module, ensuring the safe operation of the energy storage system, and minimizing the fan speed on the basis of satisfying the heat dissipation of the energy storage module, 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, a plurality of 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 at the air inlet end face of each energy storage module, and a heat dissipation duct 12 is provided at the air outlet end face of the energy storage module, and the air outlet end face of the energy storage module is connected to the heat dissipation duct 12.

[0072] The centrifugal fan 300 is arranged at the end of the heat dissipation duct 12, and the air outlet of the centrifugal fan is connected to the heat dissipation duct 12. The centrifugal fan can evenly absorb the heat of each energy storage module when running. In this embodiment, only one fan is required, and only the speed of one fan needs to be controlled to achieve effective heat dissipation of all energy storage modules in the entire energy storage cabinet, with a compact structure and small space occupation.

[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 of the three-phase IGBTs of the energy storage module to the overall comparison unit 200 .

[0076] Embodiment 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 then 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 of the three phases as the operating temperature of the energy storage module to the total comparison unit 200. That is, Tntc1 = max[T1-A, T1-B, T1-C], Tntc2 = max[T2-A, T2-B, T2-C], 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 determine the maximum temperature T max , if T max <T1(40℃), 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%), 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 (10 volts).

[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, then 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 via an intermediate medium.

[0097] Moreover, the first feature being “above”, “above”, and “above” the second feature 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. The first feature being “below”, “below”, and “below” the second feature 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, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned 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 device for a string energy storage cabinet, used to control the speed of a cooling fan of the energy storage cabinet, characterized in that: include: a first comparison unit, a second comparison unit and a total comparison unit; The energy storage cabinet is integrated with a plurality of 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; 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; 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; All the first comparison units and the 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, the second comparison unit is used to output the temperature value of the corresponding energy storage module to the total comparison unit, and the total comparison unit is used to obtain a control voltage value according to 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.

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

3. The temperature control device for a string energy storage cabinet according to claim 2, characterized in that: 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 opposite thereto is connected to the heat dissipation air duct; The air outlet of the fan is connected to the heat dissipation duct for absorbing heat.

4. The temperature control device for a string energy storage cabinet according to claim 1, characterized in that: The temperature sensor is an NTC temperature sensor.

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

6. A temperature control method based on the temperature control device according to claim 1, characterized in that: The following steps are involved: 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 total comparison unit; 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: 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 total 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 of all energy storage modules. max ; S7 total comparison unit according to the power ratio D and the maximum temperature T max , calculate the fan control voltage value; The S8 total comparison unit sends the control voltage value to the fan speed control module to control the fan speed.

7. The temperature control method of the temperature control device according to claim 6, characterized in that: In step S7, the process of the total comparison unit obtaining the fan control voltage is as follows: S71 is the maximum value of the operating power P max If it is not equal to zero, the total comparison unit obtains 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, the output control voltage value is 0. If T max ≥T1, then the output control voltage is 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, the output control voltage value is V3; If D≥D2, the output control voltage value is V3; S72 is the maximum value of the operating power P max 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, the output control voltage value is 0. If T max ≥T1, the output control voltage value is V1.

8. The temperature control method of the temperature control device according to claim 7, 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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