Auxiliary power supply circuit of energy storage system

Abstract

The invention relates to the technical field of energy storage, in particular to an auxiliary power supply circuit of an energy storage system, which comprises an external auxiliary power supply, a 400V output auxiliary power supply circuit and a direct current loop circuit, the external auxiliary power supply is connected with the L1 line, the L2 line, the L3 line, the N line and the PE line, the external auxiliary power supply is correspondingly connected with the L end and the N end of the AC / DC module through the L1 line and the N line, and the AC / DC module is connected with the direct current loop circuit. Normal power supply of the whole energy storage system is effectively protected, and the system is safer, more reliable, easy to implement, low in cost and capable of saving space.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular to an auxiliary power supply circuit for an energy storage system. Background Art

[0002] With the continuous development of the energy storage system market, the system technical requirements and system stability requirements for energy storage systems are getting higher and higher. When an emergency occurs in the power grid or the grid connection point, the energy storage system needs to respond and start quickly to ensure the normal operation of the fire protection system or energy storage system equipment. UPS is often used for backup power, but UPS has disadvantages such as high cost, large size, and high maintenance cost.

[0003] In view of the above problems, we propose an auxiliary power supply circuit for an energy storage system. Summary of the invention

[0004] The object of the present invention is to provide an auxiliary power supply circuit for an energy storage system to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An auxiliary power supply circuit for an energy storage system, comprising:

[0007] External auxiliary power supply, 400V output auxiliary power supply circuit and DC loop circuit;

[0008] The external auxiliary power supply is connected to the L1 line, the L2 line, the L3 line, the N line, and the PE line. The external auxiliary power supply is connected to the L end and the N end of the AC / DC module through the L1 line and the N line respectively. The AC / DC module is connected to the DC loop circuit.

[0009] Preferably, the external auxiliary power supply is connected to terminals 1, 2 and 3 of the 400V output auxiliary power supply circuit via L1, L2 and L3 lines respectively, and terminal 4 of the 400V output auxiliary power supply circuit is connected to the N line of the external auxiliary power supply.

[0010] Preferably, the output end of the AC / DC module is connected to a diode.

[0011] Preferably, the AC / DC module is connected to a BMS module, an EMS module, a fire protection system, an environmental control system, and a backup module.

[0012] Preferably, the DC loop circuit comprises:

[0013] A DC / DC module, wherein the Vc+ end of the DC / DC module is connected to a diode, a relay KA2 is connected between the AC / DC module and the DC / DC module, and the relay KA2 is connected to an EMU / BMS control unit.

[0014] Preferably, the DC / DC module is connected to a battery.

[0015] Preferably, the Vin+ terminal of the DC / DC module is connected to a fuse FUSE5.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention effectively protects the normal power supply of the entire energy storage system, is safer and more reliable, is simple to implement, has low cost, and saves space.

[0018] The use of the present invention will bring huge economic benefits and market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of auxiliary power supply for the energy storage system of the present invention;

[0020] Figure 2 This is a schematic diagram of the auxiliary power supply commonly used in the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] See also Figure 1-2 , an auxiliary power supply circuit for an energy storage system, comprising:

[0023] External auxiliary power supply, 400V output auxiliary power supply circuit and DC loop circuit;

[0024] The external auxiliary power supply is connected to the L1 line, the L2 line, the L3 line, the N line, and the PE line. The external auxiliary power supply is connected to the L end and the N end of the AC / DC module through the L1 line and the N line respectively. The AC / DC module is connected to the DC loop circuit. The DC loop circuit includes:

[0025] DC / DC module, the Vc+ end of the DC / DC module is connected to a diode, a relay KA2 is connected between the AC / DC module and the DC / DC module, the relay KA2 is connected to an EMU / BMS control unit, the DC / DC module is connected to a battery, and the Vin+ end of the DC / DC module is connected to a fuse FUSE5.

[0026] In the above design, if Figure 2As shown in the figure, in terms of electrical principle, after the conventional mains power is taken and converted into low voltage for power supply, a new circuit is added to take power from the DC battery side. Through the DC / DC module, the high voltage of DC is converted into low voltage for power supply.

[0027] The fuse and diode play a protective role in the system. The fuse is designed in the positive circuit of the DC / DC to prevent the internal short circuit of the module from causing the system short circuit problem when it is damaged, and play a protective role. The role of the diode is to prevent the components from being damaged when the system passes through the mains and DC power, and at the same time distinguish the different voltages of the two circuits.

[0028] The above-mentioned KA (relay) is designed to be controlled by the control unit (EMS / BMS). When the mains power is cut off, the relay remains closed and continues to supply power to the auxiliary power supply. The control unit combines the battery remaining power status feedback from the BMS to control KA (relay) and implement system protection to ensure that the system has enough remaining power to ensure normal operation of the system.

[0029] like Figure 1 As shown, the external auxiliary power supply is connected to terminals 1, 2, and 3 of the 400V output auxiliary power supply circuit via L1, L2, and L3 lines respectively, and terminal 4 of the 400V output auxiliary power supply circuit is connected to the N line of the external auxiliary power supply. The output end of the AC / DC module is connected to a diode, and the AC / DC module is connected to a BMS module, an EMS module, a fire protection system, an environmental control system, and a standby module.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary power supply circuit for an energy storage system, characterized in that: include: External auxiliary power supply, 400V output auxiliary power supply circuit and DC loop circuit; The external auxiliary power supply is connected to the L1 line, the L2 line, the L3 line, the N line, and the PE line. The external auxiliary power supply is connected to the L end and the N end of the AC / DC module through the L1 line and the N line respectively. The AC / DC module is connected to the DC loop circuit.

2. An auxiliary power supply circuit for an energy storage system according to claim 1, characterized in that: The external auxiliary power supply is connected to terminals 1, 2 and 3 of the 400V output auxiliary power supply circuit via L1, L2 and L3 lines respectively, and terminal 4 of the 400V output auxiliary power supply circuit is connected to the N line of the external auxiliary power supply.

3. The auxiliary power supply circuit of an energy storage system according to claim 1, characterized in that: The output end of the AC / DC module is connected to a diode.

4. The auxiliary power supply circuit of an energy storage system according to claim 1, characterized in that: The AC / DC module is connected to the BMS module, the EMS module, the fire protection system, the environmental control system, and the standby module.

5. The auxiliary power supply circuit of an energy storage system according to claim 1, characterized in that: The DC loop circuit comprises: A DC / DC module, wherein the Vc+ end of the DC / DC module is connected to a diode, a relay KA2 is connected between the AC / DC module and the DC / DC module, and the relay KA2 is connected to an EMU / BMS control unit.

6. The auxiliary power supply circuit of an energy storage system according to claim 5, characterized in that: The DC / DC module is connected to a battery.

7. An auxiliary power supply circuit for an energy storage system according to claim 6, characterized in that: The Vin+ end of the DC / DC module is connected to a fuse FUSE5.

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