Power supply system and energy storage system

Abstract

The utility model discloses a power supply system and an energy storage system, the power supply system is used for supplying power to at least one auxiliary electrical device of the energy storage system, in the power supply system, the input end of a first power supply module is connected with an energy storage unit, and the output end of the first power supply module is connected with the input end of a DC / DC conversion module; the output end of the DC / DC conversion module is connected with at least one auxiliary electrical device. Therefore, according to the power supply system, the energy storage unit supplies power to the at least one auxiliary electrical device through the first power supply module and the DC / DC conversion module, the stability and reliability of auxiliary power supply are improved, and meanwhile the application cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, in particular to a power supply system and an energy storage system. Background Art

[0002] Energy storage systems play a vital role in smart grids. With the continuous advancement of battery energy storage technology, energy storage systems are widely used across the power generation, distribution, and user sides of the grid. Energy storage systems include energy storage devices, energy conversion devices, and auxiliary electrical equipment. The auxiliary electrical equipment provides a stable operating environment for the energy storage system and ensures coordinated operation of its components. Therefore, the power supply stability of these auxiliary electrical equipment plays a crucial role in the stable operation of the energy storage system.

[0003] In related technologies, AC mains power or a power conversion system (PCS) connected via an AC / DC (Alternating Current / Direct Current) power conversion unit is used as the power supply, and auxiliary electrical equipment is powered by an auxiliary power supply circuit equipped with a bidirectional conversion switch and an uninterruptible power supply (UPS). However, the use of a UPS in this technical solution increases system costs, and the battery life of the UPS is limited. If the mains power and PCS are in a faulty state for a long time, the battery in the UPS can easily run low, causing it to become unusable. In addition, the bidirectional conversion switch is not very intelligent and has poor applicability. Utility Model Content

[0004] The present invention aims to at least partially address one of the technical problems in the related art. To this end, a first object of the present invention is to provide a power supply system that, through a first power supply module and a DC / DC conversion module, enables an energy storage unit to power at least one auxiliary electrical device, thereby improving the stability and reliability of the auxiliary power supply while reducing application costs.

[0005] The second purpose of the present invention is to provide an energy storage system.

[0006] To achieve the above-mentioned objectives, the first aspect of the present invention proposes a power supply system, which is used to power at least one auxiliary electrical device of an energy storage system; the power supply system includes: a first power supply module, the input end of the first power supply module is connected to the energy storage unit; a DC / DC conversion module, the input end of the DC / DC conversion module is connected to the output end of the first power supply module, and the output end of the DC / DC conversion module is connected to at least one auxiliary electrical device.

[0007] According to the power supply system of the present invention, which is used to power at least one auxiliary electrical device of an energy storage system, the input end of a first power supply module is connected to an energy storage unit, the output end of the first power supply module is connected to the input end of a DC / DC conversion module, and the output end of the DC / DC conversion module is connected to at least one auxiliary electrical device. Thus, the power supply system uses the energy stored in the energy storage unit to power the at least one auxiliary electrical device through the first power supply module and the DC / DC conversion module, thereby improving the stability and reliability of the auxiliary power supply while reducing application costs.

[0008] In addition, the power supply system according to the above embodiment of the present invention may also have the following additional technical features:

[0009] Furthermore, the power supply system also includes: a second power supply module, the input end of the second power supply module is connected to the energy storage inverter, and the output end of the second power supply module is connected to the input end of the DC / DC conversion module; and / or, a third power supply module, the input end of the third power supply module is connected to the AC power grid, and the output end of the third power supply module is connected to the input end of the DC / DC conversion module.

[0010] Specifically, the at least one auxiliary electrical device includes: one or more of a control device, a battery management system, a lighting device, a fire-fighting device, and a heat dissipation device.

[0011] Specifically, the first power supply module includes: a first conversion unit, an input end of the first conversion unit is connected to the energy storage unit, and an output end of the first conversion unit is connected to the input end of the DC / DC conversion module.

[0012] Specifically, the energy storage unit includes multiple energy storage units, and the multiple energy storage units are respectively connected to the input end of the first conversion unit.

[0013] Specifically, the first power supply module further includes: a plurality of first reverse connection prevention units, each of which is connected in series with an energy storage unit.

[0014] Specifically, the first power supply module further includes: a plurality of first switches, each first switch being connected in series with an energy storage unit.

[0015] Specifically, the DC / DC conversion module includes: a DC / DC conversion unit, an input end of the DC / DC conversion unit is connected to an output end of the first power supply module, and an output end of the DC / DC conversion unit is connected to at least one auxiliary electrical device.

[0016] Specifically, the DC / DC conversion unit includes multiple DC / DC conversion units, the input ends of the multiple DC / DC conversion units are respectively connected to the output end of the first power supply module, and the output end of each DC / DC conversion unit is connected to at least one auxiliary electrical device.

[0017] Specifically, the second power supply module includes: a second conversion unit, an input end of the second conversion unit is connected to the energy storage converter, and an output end of the second conversion unit is connected to the input end of the DC / DC conversion module.

[0018] Specifically, the second power supply module further includes: a second reverse connection prevention unit, and the second reverse connection prevention unit is connected in series with the second conversion unit.

[0019] Specifically, the second power supply module further includes: a second switch, and the second switch is connected in series with the second conversion unit.

[0020] Specifically, the third power supply module includes: a third conversion unit, an input end of the third conversion unit is connected to the AC power grid, and an output end of the third conversion unit is connected to the input end of the DC / DC conversion module.

[0021] Specifically, the third power supply module further includes: a third reverse connection prevention unit, and the third reverse connection prevention unit is connected in series with the third conversion unit.

[0022] Specifically, the third power supply module further includes: a third switch, and the third switch is connected in series with the third conversion unit.

[0023] Furthermore, the power supply system also includes: a first voltage detection module, the first voltage detection module is connected to the first power supply module; a second voltage detection module, the second voltage detection module is connected to the second power supply module; and a third voltage detection module, the third voltage detection module is connected to the third power supply module.

[0024] To achieve the above-mentioned object, a second aspect of the present invention provides an energy storage system, comprising the above-mentioned power supply system.

[0025] The energy storage system according to the embodiment of the present invention is based on the above-mentioned power supply system, which improves the operational stability and reliability of the energy storage system and the entire power supply system, while reducing the application cost of the energy storage system.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A circuit topology diagram for auxiliary power supply in related technology;

[0028] Figure 2 Schematic diagram of the connection of a power supply system according to one embodiment of the present invention;

[0029] Figure 3 is a connection diagram of a power supply system according to another embodiment of the present utility model;

[0030] Figure 4 This is a connection diagram of a power supply system according to a specific embodiment of the present invention;

[0031] Figure 5 A circuit topology diagram of a power supply system according to a specific embodiment of the present invention;

[0032] Figure 6 Schematic diagram of an energy storage system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] The power supply system and energy storage system proposed by the present invention are described below with reference to the accompanying drawings.

[0035] Energy storage systems play a vital role in smart grids. With the continuous development of battery energy storage technology, energy storage systems are widely used on the power grid's generation, distribution, and user sides. Energy storage systems utilize energy storage equipment and photovoltaic power generation systems to form integrated photovoltaic, storage, and charging microgrids, continuously providing clean energy for DC or AC loads. They can provide a continuous and reliable power supply to areas where grid connection is unavailable, enabling multi-energy complementarity and self-generation for self-use. Energy storage systems utilize a combination of battery energy storage systems with photovoltaic, wind, and thermal power generation systems to achieve stable frequency and voltage operation within the system, improving the stability and plannability of grid-connected power generation. Energy storage systems also support grid frequency regulation, peak regulation, and voltage regulation, and improve the reliability of power supply by rapidly responding to active and reactive power commands issued by upper-level systems such as the Automatic Generation Control (AGC) and Automatic Voltage Control (AVC).

[0036] The energy storage system includes energy storage equipment, energy conversion devices, auxiliary electrical equipment, etc. Among them, the energy storage device is the core component of the energy storage system, which is used to store energy in electrical, chemical or physical form. Common energy storage devices include batteries, supercapacitors, compressed air energy storage, fuel cells, etc. The energy conversion device is used to convert and output energy, such as an energy storage inverter. Auxiliary electrical equipment provides a stable operating environment for the energy storage system and ensures that the various components can work in coordination. It mainly includes the Energy Management System (EMS), Battery Management System (BMS), Local Controller (LC), switches, lighting, indicator lights, cooling fans, contactors, monitoring, etc.

[0037] In the related art, AC mains or an energy storage converter connected via an AC / DC power conversion unit is used as a power supply to power auxiliary electrical equipment. A bidirectional conversion switch and an uninterruptible power supply are configured in the power supply circuit for the auxiliary electrical equipment. By controlling the bidirectional conversion switch, the input end of the UPS can be connected to the energy storage converter PCS or AC mains, and the output end of the UPS can be connected to the auxiliary electrical equipment, so that the auxiliary electrical equipment is powered by the energy storage converter PCS or AC mains. Figure 1 shown.

[0038] However, the configuration of a UPS in the above technical solution increases system costs, and the battery life of the UPS is limited. When the AC mains power and the energy storage converter PCS are in a faulty state for a long time, it is easy to cause the battery in the UPS to run out of power, resulting in the UPS being unusable. In addition, the bidirectional conversion switch is not very intelligent and has poor applicability, which reduces its working performance.

[0039] In order to solve the above technical problems, the present application proposes a power supply system, in which the input end of the first power supply module is connected to the energy storage unit, and the energy storage unit provides electrical energy to power at least one auxiliary electrical equipment in the energy storage system through the first power supply module and the DC / DC conversion module, thereby improving the stability and reliability of the auxiliary power supply and reducing the application cost of the power supply system.

[0040] The power supply system of the present application is described in detail below with reference to the accompanying drawings.

[0041] like Figure 2As shown, the power supply system 100 of the present invention is used to power at least one auxiliary electrical device 200 of an energy storage system. The power supply system 100 may include: a first power supply module 10 and a DC / DC converter module 20. The input of the first power supply module 10 is connected to the energy storage unit 300. The input of the DC / DC converter module 20 is connected to the output of the first power supply module 10, and the output of the DC / DC converter module 20 is connected to the at least one auxiliary electrical device 200.

[0042] Specifically, the energy storage unit 300 can be an energy storage battery in the energy storage system. Taking the energy storage unit 300 as an example, during the power supply process, the first power supply module 10 draws power from the energy storage battery and converts the first direct current provided by the energy storage battery into a second direct current. The DC / DC conversion module 20 converts the second direct current output by the first power supply module 10 to a target voltage that matches the power requirements of the auxiliary electrical equipment 200, thereby meeting the power requirements of the auxiliary electrical equipment 200. The at least one auxiliary electrical equipment 200 includes one or more of a control device, a battery management system, lighting equipment, firefighting equipment, and heat dissipation equipment. Circuit connections can be made based on actual conditions.

[0043] This embodiment enables the energy storage unit 300 to power at least one auxiliary electrical device 200 through the first power supply module 10 and the DC / DC conversion module 20. At the same time, compared with related technical solutions, the use of UPS and bidirectional conversion switches is reduced, the stability and reliability of the auxiliary power supply are greatly improved, and the application cost of the power supply system is reduced.

[0044] Combine Figure 3 As shown, in one embodiment of the present application, the power supply system 100 further includes: a second power supply module 30, the input end of the second power supply module 30 is connected to the energy storage converter 400, and the output end of the second power supply module 30 is connected to the input end of the DC / DC conversion module 20; and / or, a third power supply module 40, the input end of the third power supply module 40 is connected to the AC power grid 500, and the output end of the third power supply module 40 is connected to the input end of the DC / DC conversion module 20.

[0045] Specifically, the energy storage converter 400 is the energy conversion device of the energy storage system. The energy storage unit 300 is the energy storage unit of the energy storage system, such as an energy storage battery. The energy storage unit 300 is connected to the DC side of the energy storage converter 400, and the AC side of the energy storage converter 400 is connected to the AC power grid 500.

[0046] In the case where the power supply system 100 includes a first power supply module 10, a DC / DC converter module 20, and a second power supply module 30, the input ends of the first power supply module 10 and the second power supply module 30 are respectively connected to the energy storage unit 300 and the energy storage converter 400. The output ends of the first power supply module 10 and the second power supply module 30 are respectively connected to the input end of the DC / DC converter module 20, and the output end of the DC / DC converter module 20 is connected to at least one auxiliary electrical device 200. During operation, the first power supply module 10 draws power from the energy storage unit 300 and converts the first direct current provided by the energy storage unit 300 into a second direct current. The second power supply module 30 draws power from the AC side of the energy storage converter 400 and converts the first alternating current provided by the energy storage converter 400 into a second direct current. The DC / DC converter module 20 receives the second direct current output by the first power supply module 10 and the second direct current output by the second power supply module 30 and converts it into a target electrical signal to power the auxiliary electrical device 200. In this embodiment, the power supply system 100 can supply power to at least one auxiliary electrical device 200 based on the first direct current provided by the energy storage unit 300 and the first alternating current provided by the energy storage converter 400 .

[0047] When the power supply system 100 includes a first power supply module 10, a DC / DC converter module 20, and a third power supply module 40, the input terminals of the first power supply module 10 and the third power supply module 40 are connected to the energy storage unit 300 and the AC power grid 500, respectively. The output terminals of the first power supply module 10 and the third power supply module 40 are connected to the input terminal of the DC / DC converter module 20, respectively. The output terminal of the DC / DC converter module 20 is connected to at least one auxiliary electrical device 200. During operation, the first power supply module 10 draws power from the energy storage unit 300 and converts the first DC power provided by the energy storage unit 300 into a second DC power. The third power supply module 40 draws power from the AC power grid 500 and converts the second AC power provided by the AC power grid 500 into a second DC power. The DC / DC converter module 20 receives the second DC power output by the first power supply module 10 and the second DC power output by the third power supply module 40 and converts them into target electrical signals to power the auxiliary electrical device 200. In this embodiment, the power supply system 100 can supply power to at least one auxiliary electrical device 200 based on the first direct current provided by the energy storage unit 300 and the second alternating current provided by the alternating current grid 500 .

[0048] When the power supply system 100 includes a first power supply module 10, a DC / DC converter module 20, a second power supply module 30, and a third power supply module 40, the input ends of the first power supply module 10, the second power supply module 30, and the third power supply module 40 are respectively connected to the energy storage unit 300, the AC side of the energy storage converter 400, and the AC grid 500. The output ends of the first power supply module 10, the second power supply module 30, and the third power supply module 40 are respectively connected to the input end of the DC / DC converter module 20, and the output end of the DC / DC converter module 20 is connected to at least one auxiliary electrical device 200. During operation, the first power supply module 10 draws power from the energy storage unit 300 and converts the first DC power provided by the energy storage unit 300 into a second DC power. The second power supply module 30 draws power from the AC side of the energy storage converter 400 and converts the first AC power provided by the AC side of the energy storage converter 400 into a second DC power. The third power supply module 40 draws power from the AC grid 500 and converts the second AC power provided by the AC grid 500 into a second DC power. The DC / DC conversion module 20 receives the second DC power output by the first power supply module 10, the second DC power output by the second power supply module 30, and the second DC power output by the third power supply module 40, and converts the received DC power into a target electrical signal to power the auxiliary electrical device 200. In this embodiment, the power supply system 100 can power at least one auxiliary electrical device 200 based on the first DC power provided by the energy storage unit 300, the first AC power provided by the energy storage converter 400, and the second AC power provided by the AC grid 500.

[0049] Furthermore, in the case where the power supply system 100 includes a second power supply module 30 and / or a third power supply module 40 in addition to the first power supply module 10 and the DC / DC conversion module 20, for example, the power supply system 100 includes the first power supply module 10, the DC / DC conversion module 20, the second power supply module 30 and the third power supply module 40. When the power supply system 100 supplies power to the auxiliary electrical equipment 200, the DC / DC conversion module 20 is controlled to operate, and one or more of the first power supply module 10, the second power supply module 30 and the third power supply module 40 are controlled to be in a working state. For example, when the first power supply module 10 is in a working state and the second power supply module 30 and the third power supply module 40 are not in a working state, the auxiliary electrical equipment 200 is powered only based on the first direct current provided by the energy storage unit 300; when the first power supply module 10 and the second power supply module 30 are in a working state and the third power supply module 40 is not in a working state, the auxiliary electrical equipment 200 is powered based on the first direct current provided by the energy storage unit 300 and the first alternating current provided by the energy storage converter 400. The specific working state can be controlled according to actual conditions.

[0050] In addition, the power supply system 100 can also prioritize the first power supply module 10, the second power supply module 30, and the third power supply module 40, and control the operating states of the first power supply module 10, the second power supply module 30, and the third power supply module 40 according to the priorities. For example, the first power supply module 10 has the highest priority, the second power supply module 30 has the second highest priority, and the third power supply module 40 has the lowest priority. In this case, the power supply circuit corresponding to the energy storage unit 300 has the highest priority, followed by the power supply circuit of the energy storage converter 400, and finally the power supply circuit of the AC power grid 500. In other words, the energy storage unit 300 is preferentially used to provide auxiliary power to the auxiliary electrical equipment 200 in the system, thereby improving the utilization rate of the energy storage unit 300.

[0051] In this embodiment, the power supply system 100 constructs an energy storage unit power supply branch through the first power supply module 10, constructs an energy storage converter power supply branch through the second power supply module 30, and constructs an AC mains power supply branch through the third power supply module 40. The energy storage unit 300, the energy storage converter 400 and the AC power grid 500 are used as power sources for the auxiliary electrical equipment 200. Therefore, when the AC power grid 500 and the energy storage converter 400 are in a fault state, the energy storage unit 300 can also ensure the normal operation of the auxiliary power supply, thereby improving the stability and reliability of the auxiliary power supply and reducing the application cost.

[0052] Combine Figure 4 and Figure 5 As shown, in one embodiment of the present application, the first power supply module 10 includes: a first conversion unit 11, the input end of the first conversion unit 11 is connected to the energy storage unit 300, and the output end of the first conversion unit 11 is connected to the input end of the DC / DC conversion module 20.

[0053] That is, the first direct current provided by the energy storage unit 300 is converted into a second direct current by the first conversion unit 11 and output to the DC / DC conversion module 20, so that the DC / DC conversion module 20 supplies power to the auxiliary electrical equipment 200 based on the second direct current output by the first conversion unit 11.

[0054] In one embodiment of the present application, the energy storage unit 300 includes a plurality of energy storage units 300 , and the plurality of energy storage units 300 are respectively connected to the input end of the first conversion unit 11 .

[0055] Specifically, the number of energy storage units 300 is greater than or equal to two, and the specific number can be applied according to actual circumstances. For example, two energy storage units 300 are represented by BAT1 and BAT2, respectively. The first conversion unit 11 is a DC / DC (Direct Current / Direct Current) conversion unit. The input end of the first conversion unit 11 is connected to the output end of BAT1 and the output end of BAT2, respectively, and is used to convert the first DC power provided by BAT1 and BAT2 into a second DC power output.

[0056] This embodiment uses multiple energy storage units 300 as the input power source of the energy storage unit power supply branch. When the output of one of the energy storage units 300 is abnormal, other energy storage units 30 can be used to continue to power the auxiliary electrical equipment 200, thereby improving the auxiliary power supply stability.

[0057] In one embodiment of the present application, the first power supply module 10 further includes: a plurality of first reverse polarity protection units 12, each of which is connected in series with an energy storage unit 300. The first reverse polarity protection units 12 are used to provide circuit protection for the power supply circuit corresponding to each energy storage unit 300. The first reverse polarity protection units 12 can be arranged according to actual conditions, such as an anti-reverse polarity diode, which is connected in series between the corresponding energy storage unit 300 and the first conversion unit 11 to implement circuit protection based on the unidirectional conduction characteristics of the anti-reverse polarity diode.

[0058] In one embodiment of the present application, the first power supply module 10 further includes: a plurality of first switches, each of which is connected in series with an energy storage unit 300. For example, each first switch is connected in series between a corresponding energy storage unit 300 and an input terminal of the first conversion unit 11, so as to control the on / off of the power supply circuit corresponding to the corresponding energy storage unit 300 by controlling the first switch.

[0059] As a specific embodiment of this application, Figure 4 and Figure 5 As shown, the energy storage unit power supply branch uses two energy storage units 300, namely BAT1 and BAT2, as input power sources, and the first switches are circuit breakers S11 and S12. The input end of circuit breaker S11 is electrically connected to the output ends BAT1+ and BAT1- of BAT1, and the input end of circuit breaker S12 is electrically connected to the output ends BAT2+ and BAT2- of BAT2. The output ends of circuit breakers S11 and S12 are electrically connected to the input end of the first conversion unit 11 through anti-reverse diodes D11 and D12, respectively. The output end of the first conversion unit 11 is connected to the input end of the DC / DC conversion module 20 to supply power to the auxiliary electrical equipment 200 through the DC / DC conversion module 20.

[0060] In one embodiment of the present application, the DC / DC conversion module 20 includes: a DC / DC conversion unit 21, the input end of the DC / DC conversion unit 21 is connected to the output end of the first power supply module 10, and the output end of the DC / DC conversion unit 21 is connected to at least one auxiliary electrical device 200.

[0061] That is, the DC / DC conversion unit 21 converts the received second direct current into a target voltage to power the auxiliary electrical device 200. The input of the DC / DC conversion unit 21 may come from one or more of the energy storage unit 300, the energy storage converter 400, and the AC grid 500.

[0062] Furthermore, the DC / DC converter unit 21 may have one voltage output terminal or multiple voltage output terminals. For example, the DC / DC converter unit 21 may have two voltage output terminals, namely voltage output terminal 1# and voltage output terminal 2#. Depending on the number and voltage level of the auxiliary electrical devices 200, the DC / DC converter unit 21 may selectively connect voltage output terminal 1# and voltage output terminal 2# to the corresponding auxiliary electrical device 200 to power each auxiliary electrical device 200. Thus, the DC / DC converter unit 21 generates one or more target voltages based on the second direct current to meet the different voltage level requirements of the auxiliary electrical devices 200.

[0063] In one embodiment of the present application, the DC / DC conversion unit 21 includes multiple DC / DC conversion units, the input ends of the multiple DC / DC conversion units 21 are respectively connected to the output ends of the first power supply module 10, and the output end of each DC / DC conversion unit 21 is connected to at least one auxiliary electrical device 200.

[0064] Specifically, taking two DC / DC conversion units 21 as an example, the input ends of the two DC / DC conversion units 21 respectively receive the second DC power, one DC / DC conversion unit 21 converts the second DC power into a target voltage V1, and outputs it to the corresponding auxiliary electrical equipment 200 through the 1# voltage output end, and the other DC / DC conversion unit 21 converts the second DC power into a target voltage V2, and outputs it to the corresponding auxiliary electrical equipment 200 through the 2# voltage output end.

[0065] Therefore, in this embodiment, multiple DC / DC conversion units 21 can generate multiple target voltages based on the second direct current to meet different voltage level requirements of the auxiliary electrical equipment 200.

[0066] In one embodiment of the present application, the second power supply module 30 includes: a second conversion unit 31, the input end of the second conversion unit 31 is connected to the energy storage converter 400, and the output end of the second conversion unit 31 is connected to the input end of the DC / DC conversion module 20.

[0067] Specifically, the second conversion unit 31 is an AC / DC power conversion unit, which rectifies the first alternating current provided by the energy storage converter 400 and outputs the rectified second direct current to the DC / DC conversion module 20 to power the auxiliary electrical equipment 200.

[0068] In one embodiment of the present application, the second power supply module 30 further includes: a second reverse connection prevention unit 32 , and the second reverse connection prevention unit 32 is connected in series with the second conversion unit 31 .

[0069] Specifically, the second anti-reverse polarity unit 32 is connected in series between the output end of the second conversion unit 31 and the input end of the DC / DC conversion module 20 to perform circuit protection through the second anti-reverse polarity unit 32. The second anti-reverse polarity unit 32 can be arranged according to actual conditions, such as an anti-reverse polarity diode, and circuit protection is achieved based on the unidirectional conduction characteristics of the anti-reverse polarity diode.

[0070] In one embodiment of the present application, the second power supply module 30 further includes: a second switch, which is connected in series with the second conversion unit 31 .

[0071] Specifically, the input end of the second conversion unit 31 is connected to the energy storage converter 400 via the second switch, so as to control the on / off of the power supply circuit of the energy storage converter by controlling the second switch.

[0072] As a specific embodiment of this application, Figure 4 and Figure 5 As shown, PCS is used to represent the energy storage converter 400, the second switch is a circuit breaker S30, and the second power supply module 30 is composed of the circuit breaker S30, an AC / DC power conversion unit (second conversion unit 31) and an anti-reverse diode D30 (second anti-reverse connection unit 32). The input end of the circuit breaker S30 is electrically connected to the output ends A and B of the PCS, the output end of the circuit breaker S30 is electrically connected to the input end of the AC / DC power conversion unit, and the output end of the AC / DC power conversion unit (second conversion unit 31) is connected to the DC / DC conversion module 20 via the anti-reverse diode D30, so as to supply power to the auxiliary electrical equipment 200 through the DC / DC conversion module 20.

[0073] In one embodiment of the present application, the third power supply module 40 includes: a third conversion unit 41, the input end of the third conversion unit 41 is connected to the AC power grid 500, and the output end of the third conversion unit 41 is connected to the input end of the DC / DC conversion module 20.

[0074] That is, it is configured to rectify the second alternating current into a second direct current and output the second direct current to the power supply terminal 40 to supply power to the auxiliary electrical device 200 .

[0075] Specifically, the third conversion unit 41 is an AC / DC conversion unit, which is used to rectify the second AC power output by the AC power grid 500 and provide the rectified second DC power output to the DC / DC conversion module 20 to power the auxiliary electrical equipment 500 through the DC / DC conversion module 20.

[0076] In one embodiment of the present application, the third power supply module 40 further includes: a third reverse connection protection unit 42 , and the third reverse connection protection unit 42 is connected in series with the third conversion unit 41 .

[0077] Specifically, the third anti-reverse polarity unit 42 is connected in series between the output end of the third conversion unit 41 and the DC / DC conversion module 20 to perform circuit protection through the third anti-reverse polarity unit 42. The specific arrangement can be made according to actual conditions. For example, an anti-reverse polarity diode is used as the third anti-reverse polarity unit 42, and circuit protection is achieved based on the unidirectional conduction characteristics of the anti-reverse polarity diode.

[0078] In one embodiment of the present application, the third power supply module 40 further includes: a third switch, which is connected in series with the third conversion unit 41 .

[0079] Specifically, the input end of the third conversion unit 41 is connected to the AC power 500 through the third switch, so as to control the on and off of the AC power supply circuit by controlling the third switch. Figure 4 and Figure 5 As shown, the third switch is a circuit breaker S40, and the third power supply module 40 includes a circuit breaker S40, an anti-reverse diode D40, and an AC / DC power conversion unit (third conversion unit 41).

[0080] In one embodiment of the present application, the power supply system 100 also includes: a first voltage detection module 50, the first voltage detection module 50 is connected to the first power supply module 10; a second voltage detection module 60, the second voltage detection module 60 is connected to the second power supply module 30; and a third voltage detection module 70, the third voltage detection module 70 is connected to the third power supply module 40.

[0081] Specifically, the operating voltage of the first power supply module 10 is detected by the first voltage detection module 50, the operating voltage of the second power supply module 30 is detected by the second voltage detection module 60, and the operating voltage of the third power supply module 40 is detected by the third voltage detection module 70. The operating voltage can be an input voltage, an output voltage, etc., and is not specifically limited. During operation of the power supply system, the operating status of the first power supply module 10, the second power supply module 30, and the third power supply module 40 can be controlled based on the voltage detection results of the first voltage detection module 50, the second voltage detection module 60, and the third voltage detection module 70, so that at least one of them is in an operating state.

[0082] Taking two energy storage units 300 as an example, the first voltage detection device 50 includes detection probes B and C, the second voltage detection device 60 includes detection probe A, and the third voltage detection device 70 includes detection probe D. The four detection probes are used to detect the voltage of each branch input power supply. That is, detection probe A detects the voltage of output terminals A and B of the energy storage converter 400, detection probe B detects the voltage of output terminals BAT1+ and BAT1- of BAT1, detection probe C detects the voltage of output terminals BAT2+ and BAT2- of BAT2, and detection probe D detects the voltage of output terminals L and N of the AC power grid. This determines whether the voltage of each input power supply is normal. Based on the determination results, the first conversion unit 11, the second conversion unit 31, and the third conversion unit 41 are controlled. For example, when the voltage of output terminals A and B of the energy storage converter is detected to be abnormal, the second conversion unit 31 is controlled to stop outputting, and the first conversion unit 11 and / or the third conversion unit 41 are controlled to start operating, so that the energy storage unit 300 and / or the AC power grid 500 supply power to the auxiliary electrical equipment 200.

[0083] As a specific embodiment of the present application, the input terminals a and b of detection probe A are electrically connected to the output terminal of circuit breaker S30, and the output terminals c and d are electrically connected to the input terminal of the second conversion unit 31. The input terminals a and b of detection probe B are electrically connected to the output terminal of anti-reverse diode D11, and the output terminals c and d are electrically connected to the input terminal of the first conversion unit 11. The input terminals a and b of detection probe C are electrically connected to the output terminal of anti-reverse diode D12, and the output terminals c and d are electrically connected to the input terminal of the first conversion unit 11. The input terminals a and b of detection probe D are electrically connected to the output terminal of circuit breaker S40, and the output terminals c and d are electrically connected to the input terminal of the third conversion unit 41. The four detection probes are respectively connected to the voltage detection control module so that the voltage detection control module can control the first conversion unit 11, the second conversion unit 31, and the third conversion unit 41 based on the detection results.

[0084] In order to improve the utilization rate of the energy storage system, the energy storage inverter 400 or the energy storage unit 300 can be used as the power supply for the auxiliary electrical equipment 200. When the output of the energy storage inverter 400 and the energy storage unit 300 is abnormal, the AC power grid 500 is used to power the auxiliary electrical equipment 200.

[0085] As a specific embodiment of this application, Figure 5As shown, in the power supply system 100, the first power supply module 10 includes circuit breakers S11 and S12, anti-reverse diodes D11 and D12, and a DC / DC converter unit 1 (first converter unit 11). There are two energy storage units 300, namely BAT1 and BAT2. The input end of circuit breaker S11 is electrically connected to the output ends BAT1+ and BAT1- of BAT1, and the input end of circuit breaker S12 is electrically connected to the output ends BAT2+ and BAT2- of BAT2. Circuit breakers S11 and S12 are electrically connected to the input end of DC / DC converter unit 1 via anti-reverse diodes D11 and D12, respectively. The output end of DC / DC converter unit 1 is connected to the input end of DC / DC converter unit 2 (DC / DC converter module 20). The first direct current output by the energy storage battery is converted into a second direct current by DC / DC converter unit 1, which serves as the input voltage of DC / DC converter unit 2.

[0086] Second power supply module 30 includes a circuit breaker S30, a reverse-bias diode D30, and an AC / DC power conversion unit 1 (second conversion unit 31). The input of circuit breaker S30 is electrically connected to output terminals A and B of the PCS (energy storage converter 400). The output of circuit breaker S30 is electrically connected to the input of AC / DC power conversion unit 1. The output of AC / DC power conversion unit 1 is electrically connected to the input of DC / DC conversion unit 2 (DC / DC conversion module 20) via reverse-bias diode D30. AC / DC power conversion unit 1 converts the first alternating current output by the PCS into a second direct current, which serves as the input voltage for DC / DC conversion unit 2.

[0087] The third power supply module 40 includes a circuit breaker S40, a reverse-bias diode D40, and an AC / DC power conversion unit 2 (third conversion unit 41). The input of the circuit breaker S40 is electrically connected to the L and N terminals of the AC power grid, and the output of the circuit breaker S40 is electrically connected to the input of the AC / DC power conversion unit 2. The output of the AC / DC power conversion unit 2 is connected in parallel with the output of the AC / DC power conversion unit 1 and the output of the DC / DC conversion unit 1 via the reverse-bias diode D40, and is then connected to the input of the DC / DC conversion unit 2. The AC / DC power conversion unit 2 converts the second AC power provided by the AC power grid 500 into a second DC power, which serves as the input voltage for the DC / DC conversion unit 2.

[0088] Detection probes A, B, C, and D respectively detect the voltages of the output terminals A and B of the energy storage converter PCS, the voltages of the output terminals BAT1+ and BAT1-, BAT2+ and BAT2- of BAT1 and BAT2, and the voltages of the output terminals L and N of the AC power grid to determine whether they are normal, thereby controlling the working states of the AC / DC power conversion unit 1, the DC / DC conversion unit 1, and the AC / DC power conversion unit 2. Specifically, first, the DC / DC conversion unit 1 is controlled to operate, and the AC / DC power conversion unit 1 and the AC / DC power conversion unit 2 are not operated. When it is determined based on voltage detection that one of the outputs of BAT1 and BAT2 is abnormal, the other is used as the power supply for the auxiliary electrical equipment 200. When the outputs of both BAT1 and BAT2 are abnormal, the DC / DC conversion unit 1 is controlled to stop output, and the AC / DC power conversion unit 1 is controlled to start operating, and the energy storage inverter is used as the power supply for the auxiliary electrical equipment. When the outputs of both BAT1 and BAT2 are abnormal and the output of the energy storage inverter is also abnormal, the AC / DC power conversion unit 1 is controlled to stop output, and the AC / DC power conversion unit 2 is controlled to operate, so that the AC power grid is used as the power supply for the auxiliary electrical equipment 200.

[0089] Thus, the power supply system 100 of this embodiment uses the energy storage converter 400, the energy storage unit 300, and the AC grid 500 as the power source for the auxiliary electrical equipment 200, thereby improving the stability and reliability of the energy storage system and the entire power supply system. Furthermore, compared with related technical solutions, the system does not use a UPS, thereby reducing the cost of the energy storage system. Furthermore, a voltage detection device detects the voltage at each power supply output terminal to control the operating status of the AC / DC power conversion unit and DC / DC converter unit in the circuit, and prioritizes the power supply circuits, thereby improving the utilization rate of the energy storage device and the stability of the auxiliary power supply.

[0090] In summary, according to the power supply system of the present invention, which is used to power at least one auxiliary electrical device of an energy storage system, the input end of the first power supply module is connected to the energy storage unit, the output end of the first power supply module is connected to the input end of the DC / DC conversion module, and the output end of the DC / DC conversion module is connected to at least one auxiliary electrical device. Thus, the power supply system uses the first power supply module and the DC / DC conversion module to power at least one auxiliary electrical device from the energy stored in the energy storage unit, thereby improving the stability and reliability of the auxiliary power supply while reducing application costs.

[0091] Corresponding to the above embodiment, the present utility model also proposes an energy storage system.

[0092] like Figure 6 As shown, the energy storage system 1000 of the present invention includes the above-mentioned power supply system 100.

[0093] The energy storage system according to the embodiment of the present invention is based on the above-mentioned power supply system, which improves the operational stability and reliability of the energy storage system and the entire power supply system, while reducing the application cost of the energy storage system.

[0094] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0095] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0096] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0097] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power supply system, characterized in that: The power supply system is used to supply power to at least one auxiliary electrical device of the energy storage system; the power supply system includes: a first power supply module, wherein an input end of the first power supply module is connected to the energy storage unit; a DC / DC conversion module, wherein an input end of the DC / DC conversion module is connected to an output end of the first power supply module, and an output end of the DC / DC conversion module is connected to at least one auxiliary electrical device; The DC / DC conversion module includes: a DC / DC conversion unit, wherein the input end of the DC / DC conversion unit is connected to the output end of the first power supply module, and the output end of the DC / DC conversion unit is connected to at least one of the auxiliary electrical devices; The DC / DC conversion units include a plurality of units, the input ends of the plurality of DC / DC conversion units are respectively connected to the output ends of the first power supply module, and the output end of each DC / DC conversion unit is connected to at least one of the auxiliary electrical devices; a first voltage detection module, the first voltage detection module is connected to the first power supply module; a second voltage detection module, the second voltage detection module is connected to the second power supply module; a third voltage detection module, the third voltage detection module is connected to the third power supply module; The first voltage detection module includes two detection probes, the second voltage detection module includes one detection probe, and the third voltage detection module includes one detection probe. The four detection probes are respectively communicatively connected to the voltage detection control module.

2. The power supply system according to claim 1, characterized in that: The power supply system further includes: a second power supply module, wherein the input end of the second power supply module is connected to the energy storage converter, and the output end of the second power supply module is connected to the input end of the DC / DC conversion module; and / or, A third power supply module, wherein the input end of the third power supply module is connected to the AC power grid, and the output end of the third power supply module is connected to the input end of the DC / DC conversion module.

3. The power supply system according to claim 1 or 2, characterized in that: At least one of the auxiliary electrical devices includes one or more of a control device, a battery management system, a lighting device, a fire-fighting device, and a heat dissipation device.

4. The power supply system according to claim 1, wherein: The first power supply module includes: a first conversion unit, an input end of the first conversion unit is connected to the energy storage unit, and an output end of the first conversion unit is connected to the input end of the DC / DC conversion module.

5. The power supply system according to claim 4, characterized in that: The energy storage unit includes a plurality of energy storage units, and the plurality of energy storage units are respectively connected to the input end of the first conversion unit.

6. The power supply system according to claim 5, characterized in that: The first power supply module further includes: a plurality of first reverse connection prevention units, each of which is connected in series with one of the energy storage units.

7. The power supply system according to claim 5, characterized in that: The first power supply module further includes: a plurality of first switches, each of the first switches being connected in series with one of the energy storage units.

8. The power supply system according to claim 2, wherein: The second power supply module includes: a second conversion unit, an input end of the second conversion unit is connected to the energy storage converter, and an output end of the second conversion unit is connected to the input end of the DC / DC conversion module.

9. The power supply system according to claim 8, characterized in that: The second power supply module further includes: a second reverse connection prevention unit, and the second reverse connection prevention unit is connected in series with the second conversion unit.

10. The power supply system according to claim 8, characterized in that: The second power supply module further includes: a second switch, and the second switch is connected in series with the second conversion unit.

11. The power supply system according to claim 2, wherein: The third power supply module includes: a third conversion unit, an input end of the third conversion unit is connected to the AC power grid, and an output end of the third conversion unit is connected to the input end of the DC / DC conversion module.

12. The power supply system according to claim 11, characterized in that: The third power supply module further includes a third reverse connection prevention unit, and the third reverse connection prevention unit is connected in series with the third conversion unit.

13. The power supply system according to claim 11, wherein: The third power supply module further includes: a third switch, and the third switch is connected in series with the third conversion unit.

14. An energy storage system, characterized in that: Comprising a power supply system according to any one of claims 1-13.

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