Micro-grid energy storage control device

Abstract

The utility model discloses a micro-grid energy storage control device, which is characterized in that an AC input end of an AC-DC module P1 is connected to a commercial power input end JP4, a DC output end voltage of the AC-DC module P1 is loaded to a preset power supply end, a DC side power-on switch 2QF is connected between a battery wiring end and a DC input end of a DC-DC module P2, and the DC side power-on switch 2QF is connected with the commercial power input end JP4. The voltage of the direct current output end of the DC-DC module P2 is loaded to the power supply end, a normally open contact of the positive contactor KM1 is connected in series to a positive line between the battery terminal and the load terminal, and a normally open contact of the negative contactor KM2 is connected in series to a negative line between the battery terminal and the load terminal. The negative electrode line of the battery terminal is connected in series with a shunt CD1, and the detection end of the control module U1 is connected to the detection signal output end of the shunt CD1. According to the utility model, normal monitoring operation of the battery system can be maintained when the commercial power is cut off, thereby ensuring reliable starting of the battery system.

Description

Technical Field

[0001] The utility model relates to a power supply starting device for an energy storage system, in particular to a microgrid energy storage control device. Background Art

[0002] With the continuous development of the smart grid, the scale of the power system is getting larger and larger. The large-scale introduction of distributed power sources makes the operating conditions of the power grid more and more complex. Coupled with problems such as weak grid structure, device refusal to operate, natural disasters, and cyber attacks, the safe and stable operation of the power grid faces huge challenges. Therefore, the operation mode of the microgrid energy storage system has received more and more attention.

[0003] During the operation of the battery, the function of the battery management system BMS plays a very important role: it is the core component for protection and management, not only to ensure the safe and reliable use of the battery, but also to give full play to the battery's capacity and extend its service life. When working, it realizes overvoltage, undervoltage, overcurrent, over-high temperature and over-low temperature protection of the power battery system through functions such as voltage, current and temperature detection, as well as functions such as relay control, SOC estimation, charge and discharge management, equalization control, fault alarm and handling, and communication with other controllers.

[0004] In practical applications, the BMS is generally powered by converting the mains power to 24V through the ACDC module in the high-voltage box. However, when the mains power fails or loses power, the BMS will be in a paralyzed state. Currently, the conventional method is to use a UPS backup power supply for power backup. However, there are certain problems with using a UPS to provide power backup, that is, the UPS will automatically consume power to the power failure state when not used for a long time, resulting in the inability to start the UPS. Especially for microgrid power stations located in remote wild areas such as plateaus and mountaintops, if the UPS is not used for a long time, it will lead to phenomena such as inability to start. Moreover, it is very difficult to find a power source to charge the UPS in the wild environment. Eventually, the BMS monitoring will completely fail, and the control devices in the high-voltage box cannot be closed, resulting in the inability to start the battery system. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a microgrid energy storage control device with a dual-loop power supply system, which can keep the battery system monitoring running normally when the mains power is cut off, avoid the failure of BMS monitoring, and enable the battery system to start normally, aiming at the deficiencies of the existing technology.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions.

[0007] A microgrid energy storage control device, which includes a mains input terminal JP4, an AC-DC module P1, a DC-DC module P2, a DC-side power-on switch 2QF, a battery connection terminal, a positive contactor KM1, a negative contactor KM2, a load connection terminal, and a control module U1. The mains input terminal JP4 is used to connect to the mains power. The AC input terminal of the AC-DC module P1 is connected to the mains input terminal JP4. The DC output voltage of the AC-DC module P1 is loaded on a preset power supply terminal. The battery connection terminal is used to connect to a battery. The DC-side power-on switch 2QF is connected between the battery connection terminal and the DC input terminal of the DC-DC module P2. The DC output voltage of the DC-DC module P2 is loaded on the power supply terminal. The normally open contact of the positive contactor KM1 is connected in series on the positive line between the battery connection terminal and the load connection terminal. The normally open contact of the negative contactor KM2 is connected in series on the negative line between the battery connection terminal and the load connection terminal. A shunt CD1 is connected in series on the negative line of the battery connection terminal. The detection end of the control module U1 is connected to the detection signal output end of the shunt CD1.

[0008] Preferably, the power supply terminal of the control module U1 is connected to the power supply terminal.

[0009] Preferably, it includes an AC-side power-on switch 1QF, and the AC-side power-on switch 1QF is connected in series between the AC input terminal of the AC-DC module P1 and the mains input terminal JP4.

[0010] Preferably, the control terminals of the AC-side power-on switch 1QF and the DC-side power-on switch 2QF are respectively connected to the control module U1.

[0011] Preferably, the coils of the positive contactor KM1 and the negative contactor KM2 are controlled to be powered on and off by the control module U1.

[0012] Preferably, a diode D1 is provided on the line between the DC output terminal of the AC-DC module P1 and the power supply terminal. The anode of the diode D1 is connected to the DC output terminal of the AC-DC module P1, and the cathode of the diode D1 is connected to the power supply terminal.

[0013] Preferably, a diode D2 is provided on the line between the DC output terminal of the DC-DC module P2 and the power supply terminal. The anode of the diode D2 is connected to the DC output terminal of the DC-DC module P2, and the cathode of the diode D2 is connected to the power supply terminal.

[0014] Preferably, a fuse FU1 is connected in series on the positive line of the battery connection terminal.

[0015] Preferably, it includes a first indicator light HG and a second indicator light HR. The first indicator light HG is connected in parallel to the power supply terminal, and the second indicator light HR is connected between the negative electrode of the power supply terminal and the control terminal of the control module U1.

[0016] Preferably, it includes a box body. A panel is provided on the front side of the box body. The mains input terminal JP4, the load connection terminal, the battery connection terminal, the first indicator light HG, and the second indicator light HR are all arranged on the panel. The AC-DC module P1, the DC-DC module P2, the positive contactor KM1, the negative contactor KM2, and the control module U1 are all arranged inside the box body.

[0017] In the microgrid energy storage control device disclosed by the present utility model, the mains input terminal JP4 is used to connect to the mains power supply, the battery connection terminal is used to connect to the battery, and the power supply terminal is used to supply power to the system loop. In the normal working state, the battery system accesses the mains power supply through the mains input terminal JP4, and the external mains power supply is converted to 24V for power supply through the AC-DC module P1 inside the high-voltage box. Once the mains power supply is cut off, power is directly taken from the battery connected to the battery connection terminal, and is converted to 24V by the DC-DC module P2 inside the high-voltage box to supply power to the system loop. The battery system is monitored by the battery management module BMS throughout the process. Once the voltage is too low, a threshold alarm will be issued in a timely manner, and corresponding action processing will be carried out, and there will be no power feeding phenomenon. Compared with the prior art, by setting a dual-loop power supply system inside the high-voltage box, the present utility model can keep the battery system monitoring running normally when the mains power supply is cut off, effectively solving problems such as the failure of BMS monitoring and the inability to close the corresponding control devices, thereby ensuring the reliable startup of the battery system and better meeting the application requirements. Description of the Drawings

[0018] Figure 1 is the circuit schematic diagram of the microgrid energy storage control device of the present utility model;

[0019] Figure 2 is the three-dimensional view of the box body. Detailed Embodiment

[0020] The present utility model will be described in more detail below in conjunction with the drawings and embodiments.

[0021] The present utility model discloses a microgrid energy storage control device. Please refer to Figure 1, which includes a mains power input terminal JP4, an AC-DC module P1, a DC-DC module P2, a DC-side power-on switch 2QF, battery terminals (BAT+, BAT-), a positive contactor KM1, a negative contactor KM2, load terminals (PCS+, PCS-), and a control module U1. The mains power input terminal JP4 is used to connect to the mains power. The AC input terminal of the AC-DC module P1 is connected to the mains power input terminal JP4. The DC output voltage of the AC-DC module P1 is loaded onto a preset power supply terminal (DC24V+, DC24V-). The battery terminals (BAT+, BAT-) are used to connect to a battery. The DC-side power-on switch 2QF is connected between the battery terminals (BAT+, BAT-) and the DC input terminal of the DC-DC module P2. The DC output voltage of the DC-DC module P2 is loaded onto the power supply terminal (DC24V+, DC24V-). The normally open contact of the positive contactor KM1 is connected in series on the positive line between the battery terminals (BAT+, BAT-) and the load terminals (PCS+, PCS-). The normally open contact of the negative contactor KM2 is connected in series on the negative line between the battery terminals (BAT+, BAT-) and the load terminals (PCS+, PCS-). A shunt CD1 is connected in series on the negative line of the battery terminals (BAT+, BAT-). The detection terminal of the control module U1 is connected to the detection signal output terminal of the shunt CD1.

[0022] In the above device, the mains power input terminal JP4 is used to connect to the mains power, the battery terminals (BAT+, BAT-) are used to connect to a battery, and the power supply terminal (DC24V+, DC24V-) is used to supply power to the system loop. In the normal working state, the battery system accesses the mains power through the mains power input terminal JP4, and the external mains power is converted to 24V by the AC-DC module P1 inside the high-voltage box for power supply. Once the mains power fails, power is directly taken from the battery connected to the battery terminals (BAT+, BAT-), and is converted to 24V by the DC-DC module P2 inside the high-voltage box to supply power to the system loop. The battery system is monitored throughout by a battery management module BMS (i.e., the control module U1). Once the voltage is too low, a threshold alarm will be issued in a timely manner, and corresponding action processing will be carried out, and there will be no power feeding phenomenon. Compared with the prior art, the present utility model can keep the battery system monitoring running normally when the mains power fails by setting a dual-loop power supply system inside the high-voltage box, effectively solving problems such as the failure of BMS monitoring and the inability to close the corresponding control devices, thereby ensuring the reliable startup of the battery system and better meeting the application requirements.

[0023] In this embodiment, the control module U1 is also powered by 24V direct current. Specifically, the power supply terminal of the control module U1 is connected to the power supply terminal (DC24V+, DC24V-).

[0024] Further, this embodiment includes an AC-side power-on switch 1QF, and the AC-side power-on switch 1QF is connected in series between the AC input terminal of the AC-DC module P1 and the mains input terminal JP4. In the above circuit, the control terminals of the AC-side power-on switch 1QF and the DC-side power-on switch 2QF are respectively connected to the control module U1, that is, the control module U1 is used to control the on-off states of the AC-side power-on switch 1QF and the DC-side power-on switch 2QF. Similarly, the coils of the positive contactor KM1 and the negative contactor KM2 are both controlled by the control module U1 for power-on and power-off.

[0025] As a preferred method, a diode D1 is provided on the line between the DC output terminal of the AC-DC module P1 and the power supply terminal (DC24V+, DC24V-). The anode of the diode D1 is connected to the DC output terminal of the AC-DC module P1, and the cathode of the diode D1 is connected to the power supply terminal (DC24V+, DC24V-). Correspondingly, a diode D2 is provided on the line between the DC output terminal of the DC-DC module P2 and the power supply terminal (DC24V+, DC24V-). The anode of the diode D2 is connected to the DC output terminal of the DC-DC module P2, and the cathode of the diode D2 is connected to the power supply terminal (DC24V+, DC24V-).

[0026] In the above circuit, after confirming that the DC wiring and communication wiring of the battery pack are correct before the BMS test, while closing the switches of the AC-DC module P1 and the DC-DC module P2, then closing the DC-side power-on switch 2QF, using Figure 1 the unidirectional conductivity of the diodes D1, D2, and D3 in it, that is, the forward characteristic that the current can only flow in from the positive electrode and flow out from the negative electrode. Connect the positive electrode of the diode to the high-potential end and the negative electrode to the low-potential end, and the diode will conduct. At the same time, the selected AC-DC module P1 will raise the level. During normal power-on, the output potential of the AC-DC module P1 is high, and the AC-DC module P1 acts on the power supply circuit. Only when the mains power is cut off, it will be converted to the DC-DC module P2 to work and supply power to the power supply circuit.

[0027] In order to play an insurance role, in this embodiment, a fuse FU1 is connected in series on the positive line of the battery wiring terminal (BAT+, BAT-).

[0028] In practical applications, it is preferably to adopt the method of light alarm. Please refer to Figure 1, this embodiment includes a first indicator light HG and a second indicator light HR. The first indicator light HG is connected in parallel to the power supply terminals (DC24V+, DC24V-), and the second indicator light HR is connected between the negative pole of the power supply terminals (DC24V+, DC24V-) and the control terminal of the control module U1.

[0029] Combined with Figure 1 and Figure 2 As shown, this embodiment includes a box body 1. A panel 2 is provided on the front side of the box body 1. The mains input terminal JP4, the load connection terminals (PCS+, PCS-), the battery connection terminals (BAT+, BAT-), the first indicator light HG, and the second indicator light HR are all provided on the panel 2. The AC-DC module P1, the DC-DC module P2, the positive contactor KM1, the negative contactor KM2, and the control module U1 are all provided inside the box body 1.

[0030] In practical applications, for the convenience of handling, two handles 3 are further provided on the box body 1. Specifically, the two handles 3 are both provided on the panel 2.

[0031] The above are only preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, or improvements made within the technical scope of the present invention shall be included within the scope protected by the present invention.

Claims

1. A microgrid energy storage control device, characterized in that: The utility model comprises a mains input terminal JP4, an AC-DC module P1, a DC-DC module P2, a DC side power-on switch 2QF, a battery terminal, a positive contactor KM1, a negative contactor KM2, a load terminal and a control module U1, wherein the mains input terminal JP4 is used to connect to the mains, the AC input terminal of the AC-DC module P1 is connected to the mains input terminal JP4, the DC output terminal voltage of the AC-DC module P1 is loaded on a preset power supply terminal, the battery terminal is used to connect to a battery, and the DC side power-on switch 2QF is connected to the battery terminal. The DC input terminal of the DC-DC module P2 is connected to the DC output terminal of the DC-DC module P2, the DC output terminal voltage of the DC-DC module P2 is loaded on the power supply terminal, the normally open contact of the positive contactor KM1 is connected in series to the positive line between the battery terminal and the load terminal, the normally open contact of the negative contactor KM2 is connected in series to the negative line between the battery terminal and the load terminal, the negative line of the battery terminal is connected in series with a shunt CD1, and the detection end of the control module U1 is connected to the detection signal output end of the shunt CD1.

2. The microgrid energy storage control device according to claim 1, characterized in that: The power supply end of the control module U1 is connected to the power supply end.

3. The microgrid energy storage control device according to claim 1, characterized in that: An AC side power-on switch 1QF is included, and the AC side power-on switch 1QF is connected in series between the AC input terminal of the AC-DC module P1 and the mains input terminal JP4.

4. The microgrid energy storage control device according to claim 3, characterized in that: Control ends of the AC side power-on switch 1QF and the DC side power-on switch 2QF are respectively connected to the control module U1 .

5. The microgrid energy storage control device according to claim 1, characterized in that: The coil of the positive contactor KM1 and the coil of the negative contactor KM2 are both powered on and off by the control module U1.

6. The microgrid energy storage control device according to claim 1, characterized in that: A diode D1 is provided on the line between the DC output end of the AC-DC module P1 and the power end, the anode of the diode D1 is connected to the DC output end of the AC-DC module P1, and the cathode of the diode D1 is connected to the power end.

7. The microgrid energy storage control device according to claim 1, characterized in that: A diode D2 is provided on the line between the DC output end of the DC-DC module P2 and the power supply end, the anode of the diode D2 is connected to the DC output end of the DC-DC module P2, and the cathode of the diode D2 is connected to the power supply end.

8. The microgrid energy storage control device according to claim 1, characterized in that: A fuse FU1 is connected in series to the positive line of the battery terminal.

9. The microgrid energy storage control device according to claim 1, characterized in that: It includes a first indicator light HG and a second indicator light HR. The first indicator light HG is connected in parallel to the power supply end, and the second indicator light HR is connected between the negative pole of the power supply end and the control end of the control module U1.

10. The microgrid energy storage control device according to claim 9, characterized in that: The invention comprises a box (1), wherein a panel (2) is arranged on the front side of the box (1), the mains input terminal JP4, the load terminal, the battery terminal, the first indicator light HG and the second indicator light HR are all arranged on the panel (2), and the AC-DC module P1, the DC-DC module P2, the positive contactor KM1, the negative contactor KM2 and the control module U1 are all arranged in the box (1).

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