Auxiliary control electrical circuit of container energy storage system

Abstract

The utility model provides an auxiliary control electrical circuit of a container energy storage system. The auxiliary control electrical circuit comprises a UPS, a UPS battery unit, a plurality of secondary loop devices, a BMS, a first switch, a second switch, an AC / DC switching power supply and a short-circuit lead. The positive electrode and the negative electrode of the UPS battery unit are connected with the power supply input end of the BMS through the first switch and the AC / DC switching power supply, the first voltage output end of the BMS is connected with the input control end of the second switch, the input end of the UPS is connected with the output end of the UPS through the output control end of the second switch and the short-circuit wire, the fault feedback end of the UPS is connected with the fault voltage detection end of the BMS, and the fault voltage detection end of the BMS is connected with the power supply input end of the BMS. The output end of the UPS is further connected with a plurality of secondary loop devices, and when the UPS breaks down, the first switch and the second switch are in a closed state.

Description

TECHNICAL FIELD

[0001] The utility model relates to container energy storage system auxiliary control technical field especially relates to a container energy storage system auxiliary control electrical circuit. BACKGROUND

[0002] As an important part of renewable energy development, the installed capacity of container energy storage system has experienced explosive growth.

[0003] The current container energy storage system adopts the following technical scheme: a plurality of single cells are combined into a battery pack (PACK) in series-parallel mode on the primary direct current side circuit, a plurality of PACKs are connected in series to form a battery cluster in a high-voltage box, and a plurality of battery clusters are connected in parallel to form a battery stack in a busbar cabinet.

[0004] The secondary alternating current side circuit adopts air switches, UPS (uninterruptible power supply), lead-acid batteries, etc. to form an auxiliary circuit to supply power to the BMS (Battery Management System) control system, the liquid cooling unit system, the fire fighting system, the environmental control monitoring system, etc. However, once the UPS restarts due to high temperature or other factors, the BMS control system will not work normally, causing the power grid to drop out of the network, the EMS (Energy Management System) to report faults, and frequent customer experience and complaint problems. SUMMARY

[0005] The utility model aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, the first purpose of the utility model is to provide a container energy storage system auxiliary control electrical circuit, mainly to solve the power grid fluctuation caused by the failure of the UPS leading to the BMS not working normally.

[0007] To achieve the above purpose, the utility model provides a container energy storage system auxiliary control electrical circuit in the first aspect, which comprises a UPS, a UPS battery unit, a plurality of secondary circuit devices, a BMS, a first switch, a second switch, an AC / DC switch power supply and a short circuit wire; the positive and negative poles of the UPS battery unit are connected to the power supply input end of the BMS through the first switch and the AC / DC switch power supply; the first voltage output end of the BMS is connected to the input control end of the second switch; the input end of the UPS is connected to the output end of the UPS through the output control end of the second switch and the short circuit wire; the fault feedback end of the UPS is connected to the fault voltage detection end of the BMS; the output end of the UPS is also connected to a plurality of secondary circuit devices; and when the UPS fails, the first switch and the second switch are in the closed state.

[0008] The utility model discloses a container energy storage system auxiliary control electrical circuit, including UPS, UPS battery unit, a plurality of secondary circuit equipment, BMS, first switch, second switch, AC DC switch power supply and short circuit wire, the positive pole of UPS battery unit is connected with the power supply input end of BMS through first switch, AC DC switch power supply, the first voltage output end of BMS is connected with the input control end of second switch, the input end of UPS is connected with the output end of UPS through the output control end of second switch, short circuit wire, the fault feedback end of UPS is connected with the fault voltage detection end of BMS, the output end of UPS is also connected with a plurality of secondary circuit equipment, and when UPS fails, first switch and second switch are in closed state. In this case, when UPS fails, relative to the secondary circuit equipment power failure in prior art that BMS cannot be powered, the electric energy of UPS battery unit in the circuit of the utility model can be output as direct current through first switch, AC DC switch power supply to power BMS, thereby guaranteeing the normal operation of BMS, and second switch is automatically closed when detecting the first voltage of BMS, to make the electric energy of UPS input end directly reach UPS output end through short circuit wire, thereby guaranteeing the normal operation of secondary circuit equipment, and the fluctuation of power grid is avoided, and therefore the utility model solves the fluctuation of power grid caused by the fact that BMS cannot normally work due to UPS failure.

[0009] In the container energy storage system auxiliary control electrical circuit of the utility model, the battery voltage detection end of the BMS is connected with the UPS battery unit, and the second voltage output end of the BMS is connected with the input control end of the first switch.

[0010] In the container energy storage system auxiliary control electrical circuit of the utility model, the plurality of secondary circuit equipment includes a plurality of AC / DC converters, the output end of the UPS is connected with the power supply input end of the BMS through part of the AC / DC converters, and the output end of the AC DC switch power supply is connected with the power supply input end of the BMS through a diode.

[0011] In the container energy storage system auxiliary control electrical circuit of the utility model, the first switch selects an intermediate relay.

[0012] In the container energy storage system auxiliary control electrical circuit of the utility model, the second switch selects a solid-state relay.

[0013] The auxiliary control electrical circuit of the container energy storage system further includes a third switch and a fourth switch, a battery end of the UPS is connected with the UPS battery unit through an output control end of the third switch and an output control end of the fourth switch, and an input control end of the fourth switch is connected with a third voltage output end of the BMS.

[0014] In the auxiliary control electrical circuit of the container energy storage system, the third switch is an air switch.

[0015] In the auxiliary control electrical circuit of the container energy storage system, the fourth switch is a direct current relay.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0018] Figure 1 FIG. 1 is a structural schematic diagram of an auxiliary control electrical circuit of a container energy storage system according to an embodiment of the present application;

[0019] Figure 2 FIG. 2 is a structural schematic diagram of another auxiliary control electrical circuit of a container energy storage system according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] The exemplary embodiments will be described in detail herein below with reference to the drawings. The following description is merely exemplary in nature and is in no way intended to limit the scope of the present application, application, or application. Rather, the following description is intended only to provide a detailed example of the application, application, or application, as claimed in the appended claims, and is not intended to limit the scope of the application, application, or application, as claimed in the appended claims, in any way.

[0021] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the description of the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0022] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified. It should also be understood that the term "and / or" used in the utility model means and includes any or all possible combinations of one or more associated listed items.

[0023] The embodiments of the utility model are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0024] The utility model will be described in detail below in combination with specific embodiments.

[0025] At present, the secondary AC side loop of the container energy storage system adopts air switch, UPS, lead-acid battery and other ways to form an auxiliary circuit to supply power to the BMS control system, liquid cooling unit system, fire fighting system, environmental monitoring system and other secondary loop equipment; among them, the BMS control system and other secondary loop equipment are connected with the output end of the UPS. Once the UPS restarts and other failure problems occur due to high temperature or other factors, the BMS control system will not work normally, thereby causing the power grid to drop the network, the EMS system to report failure, and the customer experience and complaint problems to be frequent.

[0026] Based on this, the utility model provides a container energy storage system auxiliary control electrical circuit, the main purpose is to solve the power grid fluctuation caused by the BMS unable to work normally due to UPS failure.

[0027] In the embodiment, the container energy storage system auxiliary control electrical circuit includes a UPS, a UPS battery unit, a plurality of secondary circuit devices, a BMS, a first switch, a second switch, an AC / DC switching power supply, and a short-circuit wire.

[0028] The positive and negative poles of the UPS battery unit are connected to the power supply input end of the BMS via the first switch and the AC / DC switching power supply, the first voltage output end of the BMS is connected to the input control end of the second switch, the input end of the UPS is connected to the output end of the UPS via the output control end of the second switch and the short-circuit wire, the fault feedback end of the UPS is connected to the fault voltage detection end of the BMS, and the output end of the UPS is also connected to the plurality of secondary circuit devices. The plurality of secondary circuit devices include a plurality of AC / DC converters, and the output end of the UPS is connected to the power supply input end of the BMS via part of the AC / DC converters.

[0029] Specifically, when the UPS is normal, the UPS outputs AC 220V power supply, and the AC 220V power supply output by the UPS supplies power to the BMS, the liquid cooling unit system, the fire control system, the environmental control monitoring system, and the plurality of secondary circuit devices.

[0030] When the UPS fails, the first switch and the second switch are in a closed state. Specifically, when the UPS fails, the BMS receives the feedback fault state DIL signal from the UPS, the electrical energy in the UPS battery unit is converted into direct current (for example, 24V) via the first switch and the AC / DC switching power supply, and is sent to the BMS, at this time, the BMS normally operates, the BMS outputs the DO2H signal (i.e., outputs the first voltage), the second switch is automatically closed when the first voltage is monitored, the electrical energy at the input end of the UPS directly reaches the output end of the UPS via the short-circuit wire, thereby supplying power to the liquid cooling unit system, the fire control system, the environmental control monitoring system, and the plurality of secondary circuit devices.

[0031] In the embodiment, considering the over-discharge problem of the UPS battery unit, the battery voltage detection end of the BMS is connected to the UPS battery unit, and the second voltage output end of the BMS is connected to the input control end of the first switch. When the voltage of the UPS battery unit is less than or equal to the first lower limit of the set voltage, the BMS outputs the DO3H signal (i.e., outputs the second voltage), and the first switch is automatically disconnected when the second voltage is monitored, that is, when the UPS fails and the voltage of the UPS battery unit is less than or equal to the first lower limit of the set voltage, the first switch is in a disconnected state, at this time, the UPS battery unit stops outputting externally, thereby avoiding the over-discharge of the UPS battery unit. It should be noted that when the BMS does not work, the second switch is in a disconnected state.

[0032] In the embodiment, the AC / DC switching power supply is connected to the power input end of the BMS, and the power of the AC / DC switching power supply is prevented from flowing to the AC / DC converter, so that the output end of the AC / DC switching power supply is connected to the power input end of the BMS through a diode.

[0033] In the embodiment, the UPS battery unit can adopt a lead-acid battery.

[0034] In the embodiment, the first switch can select the intermediate relay, and the second switch can select the solid-state relay.

[0035] Taking the first switch selecting the intermediate relay KM3 and the second switch selecting the solid-state relay KM2 and the UPS battery unit adopting a lead-acid battery as an example. Figure 1 A structure diagram of the auxiliary control electrical circuit of the container energy storage system provided by the embodiment of the utility model.

[0036] As shown in Figure 1 The auxiliary control electrical circuit of the container energy storage system includes a UPS, a lead-acid battery, a plurality of air switches, a plurality of secondary circuit devices, a BMS, an intermediate relay KM3, a solid-state relay KM2, an AC / DC switching power supply, and a short-circuit wire.

[0037] The output end of the UPS is connected to the corresponding secondary circuit device through a separate air switch, for example, as shown in Figure 1 The output end of the UPS is connected to the fan and the lighting in the energy storage system cabinet through the air switch QFA1, the output end of the UPS is also connected to the corresponding AC / DC converter through the air switch QFA2 and the air switch QFA3, and then connected to different BMS through the corresponding diode VD2 and diode VD3 (for example, the branch connected by the air switch QFA2 is connected to the 1# to 6# BMS, and the branch connected by the air switch QFA3 is connected to the 7# to 12# BMS), the output end of the UPS is also connected to the fan controller through the air switch QFA4, the output end of the UPS is also connected to the corresponding AC / DC converter through the air switch QFA5, thereby realizing water invasion power supply, the output end of the UPS is also connected to the standby AC or DC through the air switch QFA6, and the output end of the UPS is also connected to the socket through the air switch QFA7 to realize power supply to other electrical equipment.

[0038] As shown in Figure 1As shown, the positive and negative poles of the lead-acid battery are connected with the power input end of the BMS through the intermediate relay KM3 and the AC / DC switching power supply, wherein the positive pole of the lead-acid battery is connected with the contact 12 of the intermediate relay KM3, the negative pole is connected with the contact 9 of the intermediate relay KM3, the contact 12 of the intermediate relay KM3 is communicated with the contact 4 thereof, the contact 9 of the intermediate relay KM3 is communicated with the contact 1 thereof, the contacts 4 and 1 of the intermediate relay KM3 are respectively connected with the input end of the AC / DC switching power supply, and the output end of the AC / DC switching power supply is connected with the power input end of the BMS through the diode VD1. The first voltage output end of the BMS is connected with the input control end (i.e. the coil 3 end and the coil 4 end) of the solid-state relay KM2, the input end of the UPS is connected with the output control end (i.e. the controlled 1 end and the controlled 2 end) of the solid-state relay KM2 and the output end of the UPS through the short-circuit wire, and the fault feedback end of the UPS is connected with the fault voltage detection end of the BMS.

[0039] As shown, Figure 1 When the UPS is normal, the UPS outputs the AC 220V power supply (including the power supply live wire AC 220V-L and the power supply zero line AC 220V-N), and the AC 220V power supply output by the UPS supplies power to the corresponding secondary circuit equipment through the corresponding air switch, realizing the cabinet cooling, lighting, fan control, water invasion power supply, BMS power supply, etc.

[0040] When the UPS fails, the BMS receives the feedback fault state DIL signal from the UPS (i.e. the BMS detects the fault voltage V4-), and the electrical energy in the lead-acid battery is converted into direct current (for example, 24V) through the intermediate relay KM3 and the AC / DC switching power supply, and then is sent to the BMS through the diode VD1, at this time the BMS normally operates, the BMS outputs the DO2H signal (i.e. outputs the first voltage V2-), and the solid-state relay KM2 automatically closes when detecting the first voltage V2-, and the electrical energy at the input end of the UPS directly reaches the output end of the UPS through the short-circuit wire, thereby supplying power to each secondary circuit equipment.

[0041] When the UPS fails, the lead-acid battery is in a discharging state, and when the voltage of the lead-acid battery is lower than the lower limit of the first set voltage, the BMS outputs the DO3H signal (i.e. outputs the second voltage V3-), and the contacts 5 and 8 of the intermediate relay KM3 are respectively closed when detecting the second voltage V3-, at this time the passage between the contact 9 and the contact 1 of the intermediate relay KM3 is disconnected, and the passage between the contact 12 and the contact 4 of the intermediate relay KM3 is disconnected, i.e. the intermediate relay KM3 is automatically disconnected, and the output of the lead-acid battery to the outside is stopped, thereby avoiding over-discharge of the lead-acid battery.

[0042] In the embodiment, the container energy storage system auxiliary control electrical circuit further comprises a third switch and a fourth switch in consideration of the case that the UPS is normal but the UPS input end has no alternating current, the battery end of the UPS is connected with the UPS battery unit through the output control end of the third switch and the fourth switch, and the input control end of the fourth switch is connected with the third voltage output end of the BMS.

[0043] Specifically, when the UPS is normal but the UPS input end has no alternating current, the electric energy of the UPS battery unit is converted into direct current (for example, 24V) through the first switch and the AC / DC switching power supply and is sent to the BMS, at this time, the BMS normally operates, the BMS outputs a DO1H signal (that is, outputs the third voltage), and the fourth switch is automatically closed when the third voltage is monitored, at this time, the UPS battery unit is in a discharging state and supplies power to each secondary circuit device through the fourth switch, the third switch and the UPS; at this time, the UPS battery unit is in the discharging state, when the BMS detects that the voltage of the UPS battery unit is greater than the lower limit of the first set voltage and less than or equal to the lower limit of the second set voltage, the fourth switch is disconnected, the UPS battery unit no longer supplies power to the UPS rear-end load through the UPS, and it is ensured that the UPS battery unit has sufficient electric quantity to supply the BMS, so that the temperature thermal runaway state of the battery pack can be detected at any time; when the BMS detects that the voltage of the UPS battery unit is less than or equal to the lower limit of the first set voltage, the first switch is disconnected, and the UPS battery unit stops outputting to the outside, so that overdischarge of the lead-acid battery is ensured.

[0044] Taking the case that the first switch selects the intermediate relay KM3, the second switch selects the solid-state relay KM2, the UPS battery unit adopts the lead-acid battery, the third switch selects the air switch QFC0, and the fourth switch selects the direct-current relay KM1 as an example. Figure 2 A structure diagram of another container energy storage system auxiliary control electrical circuit provided by the embodiment of the utility model.

[0045] As shown in Figure 2 The container energy storage system auxiliary control electrical circuit further comprises an air switch QFC0 and a direct-current relay KM1, the battery end of the UPS is connected with the positive and negative poles of the lead-acid battery through the output control end (that is, the controlled 1 end and the 2 end) of the air switch QFC0 and the direct-current relay KM1, and the input control end (that is, the coil 3 end and the 4 end) of the direct-current relay KM1 is connected with the third voltage output end of the BMS.

[0046] As shown in Figure 2As shown, when the UPS is normal but the UPS input end has no alternating current, the electric energy of the lead-acid battery is converted into direct current (for example, 24V) through the intermediate relay KM3 and the AC / DC switching power supply, and is sent to the BMS through the diode VD1, at this time the BMS normally operates, the BMS outputs the DO1H signal (that is, outputs the third voltage V1-), and the direct current relay KM1 is automatically closed when the third voltage V1- is monitored, at this time the lead-acid battery is in a discharging state and supplies power to each secondary circuit device through the direct current relay KM1, the air switch QFC0 and the UPS; at this time, since the lead-acid battery is in a discharging state, when the BMS detects that the voltage of the lead-acid battery is greater than the lower limit of the first set voltage and less than or equal to the lower limit of the second set voltage, the direct current relay KM1 is disconnected, the UPS battery unit no longer supplies power to the UPS rear-end load through the UPS, ensuring that the UPS battery unit has sufficient power to supply the BMS, thereby ensuring that the temperature thermal runaway state of the battery pack can be detected at any time; when the BMS detects that the voltage of the lead-acid battery is less than or equal to the lower limit of the first set voltage, the intermediate relay KM3 is automatically disconnected, and the output of the lead-acid battery to the outside is stopped, thereby avoiding over-discharge of the lead-acid battery.

[0047] The power supply of the auxiliary control electrical circuit of the container energy storage system generally adopts ATS switching switch double-branch power supply. Specifically, the UPS input end is further connected with 2-branch power supply through a socket and an ATS transfer switch, one branch is connected with a primary direct current side loop of the container energy storage system, and one branch is connected with commercial power, wherein the direct current side loop is connected with the first input end of the ATS transfer switch through an air switch QFA0, and the primary commercial power is directly connected with the second input end of the ATS transfer switch. As shown in Figure 2 The output end of the ATS transfer switch is N11JII. The UPS input end has alternating current when the commercial power or the direct current side loop is normal.

[0048] Based on the auxiliary control electrical circuit of the container energy storage system, Figure 2 The electric energy flow of the auxiliary control electrical circuit of the container energy storage system is as follows:

[0049] 1) When the UPS is normal and the UPS input end has alternating current, if the voltage of the lead-acid battery is less than or equal to the set voltage upper limit, the intermediate relay KM3 is in a disconnected state, the solid-state relay KM2 is in a disconnected state, and the direct current relay KM1 is in a closed state; if the voltage of the lead-acid battery is greater than the set voltage upper limit, the intermediate relay KM3 is in a disconnected state, the solid-state relay KM2 is in a disconnected state, and the direct current relay KM1 is in a disconnected state;

[0050] Specifically, when the UPS is normal and the UPS input end has AC power, the intermediate relay KM3 is in an open state, and the solid-state relay KM2 is in a default state (i.e., an open state). When the UPS is in a normal state and the front end (e.g., the UPS input end) detects AC voltage AC220V, a circuit inside the UPS functions to output AC220V power to the cabinet lighting, BMS and other secondary circuit devices. At this time, the BMS is in normal operation. If the voltage of the lead-acid battery is less than or equal to the set upper voltage limit, the DC relay KM1 is in a closed state. At this time, one output of the UPS is output to the air switch QFC0, the DC relay KM1 and the lead-acid battery. At this time, the BMS controls the contacts 3 and 4 at both ends of the relay coil of KM1, and the normally open contacts 1 and 2 of KM1 are connected. At this time, the lead-acid battery is in a charging state. When the BMS detects that the voltage of the lead-acid battery is too high (e.g., greater than the set upper voltage limit), KM1 is opened, so that the lead-acid battery is not overcharged.

[0051] 2) When the UPS is normal but the UPS input end has no AC power, if the voltage of the lead-acid battery is greater than the second set lower voltage limit (the second set lower voltage limit is greater than the first set lower voltage limit), the intermediate relay KM3 is in a closed state, the solid-state relay KM2 is in an open state, and the DC relay KM1 is in a closed state. If the voltage of the UPS battery unit is greater than the first set lower voltage limit and less than or equal to the second set lower voltage limit, the intermediate relay KM3 is in a closed state, the solid-state relay KM2 is in an open state, and the DC relay KM1 is in an open state. If the voltage of the UPS battery unit is less than or equal to the first set lower voltage limit, the intermediate relay KM3 is in an open state, the solid-state relay KM2 is in an open state, and the DC relay KM1 is in an open state.

[0052] Specifically, when the UPS is in a normal state but the front end cannot detect AC voltage AC220V, the power of the lead-acid battery is input to the switching power supply through the common end 9 (i.e., contact 9) and the 12 (i.e., contact 12) of the intermediate relay KM3, the normally closed end 1 (i.e., contact 1) and the 4 (i.e., contact 4). The power of the lead-acid battery is output to the BMS by the switching power supply AC / DC. The BMS closes the coil 3 (i.e., contact 3 of KM1) and the 4 (i.e., contact 4 of KM1) of the DC relay KM1, and the normally open contacts 1 (i.e., contact 1 of KM1) and 2 (i.e., contact 2 of KM1) are connected. At this time, the lead-acid battery is in a discharging state and supplies power to the secondary circuit devices through the UPS. When the BMS detects that the voltage of the lead-acid battery is low (e.g., greater than the first set lower voltage limit and less than or equal to the second set lower voltage limit), the DC relay KM1 is opened, and the lead-acid battery no longer supplies power to the UPS rear-end load through the UPS, so that the lead-acid battery has sufficient power to supply the BMS, thereby ensuring that the temperature runaway state of the battery pack can be detected at any time.

[0053] 3) When the UPS fails and the UPS input has AC power, if the voltage of the lead-acid battery is greater than the lower limit of the first set voltage, the intermediate relay KM3 is in a closed state, the solid-state relay KM2 is in a closed state, and the DC relay KM1 is in an open state; if the voltage of the lead-acid battery is less than or equal to the lower limit of the first set voltage, the intermediate relay KM3 is in an open state, the solid-state relay KM2 is in an open state, and the DC relay KM1 is in an open state.

[0054] Specifically, when the UPS is in a failure state, the failure state DIL signal is fed back to the BMS, and when the front-end detects AC voltage AC220V, the lead-acid battery outputs to the switching power supply AC / DC through the 1st and 4th pins of the intermediate relay KM3, and outputs DC24V power to the BMS under the action of the circuit of the switching power supply, at this time, the BMS outputs the DO2H signal to the coil contact of the solid-state relay KM2, and the KM2 relay is closed, so that the UPS rear-end load is normally powered; when the UPS is in a failure state and the lead-acid battery is in a discharge state, when it is detected that the voltage across the lead-acid battery is low (for example, the voltage of the lead-acid battery is less than or equal to the lower limit of the first set voltage), the intermediate relay KM3 is closed, and the lead-acid battery stops outputting externally, thereby avoiding over-discharge of the lead-acid battery.

[0055] The auxiliary control electrical circuit of the container energy storage system provided by the embodiment of the utility model, including UPS, UPS battery unit, multiple secondary circuit equipment, BMS, first switch, second switch, AC / DC switching power supply and short circuit wire, the positive and negative poles of the UPS battery unit are connected with the power supply input end of the BMS through the first switch and the AC / DC switching power supply, the first voltage output end of the BMS is connected with the input control end of the second switch, the input end of the UPS is connected with the output end of the UPS through the output control end of the second switch and the short circuit wire, the failure feedback end of the UPS is connected with the failure voltage detection end of the BMS, and the output end of the UPS is also connected with the multiple secondary circuit equipment, and the first switch and the second switch are in a closed state when the UPS fails. In this case, when the UPS fails, the power of the UPS battery unit in the circuit of the utility model can be output as direct current through the first switch and the AC / DC switching power supply to supply power to the BMS, so as to ensure the normal operation of the BMS, and the second switch is automatically closed when the first voltage of the BMS is detected, so that the power of the UPS input end directly reaches the UPS output end through the short circuit wire, thereby ensuring the normal operation of the secondary circuit equipment, and the fluctuation of the power grid is avoided, so that the utility model solves the fluctuation of the power grid caused by the failure of the BMS.

[0056] The utility model mainly increases direct current relay KM1, solid state relay KM2, intermediate relay KM3 and switching power supply, solves the problem that UPS stops normal work because of UPS failure, BMS cannot work normally, PCS (energy storage converter) stops in turn, causes power grid to drop network, intermediate relay KM3 which increases further solves the lead acid battery overdischarge damage caused by the lead acid battery UPS failure problem.

[0057] It should be understood that the components, connections and relationships of the components, and the functions of the components shown in the utility model are merely examples, and are not intended to limit the implementation of the utility model described and / or claimed in the utility model. The steps can be reordered, added or deleted using the various forms of processes shown above. For example, the steps described in the utility model can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions disclosed in the utility model can be achieved, and the utility model is not limited herein.

[0058] The above specific embodiments do not constitute a limitation on the scope of protection of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. An auxiliary control electrical circuit for a containerized energy storage system, characterized in that, The system includes a UPS, a UPS battery unit, multiple secondary circuit devices, a BMS, a first switch, a second switch, an AC / DC switching power supply, and a short-circuit wire. The positive and negative terminals of the UPS battery unit are connected to the power input terminal of the BMS via the first switch and the AC / DC switching power supply. The first voltage output terminal of the BMS is connected to the input control terminal of the second switch. The input terminal of the UPS is connected to the output terminal of the UPS via the output control terminal of the second switch and the short-circuit wire. The fault feedback terminal of the UPS is connected to the fault voltage detection terminal of the BMS. The output terminal of the UPS is also connected to multiple secondary circuit devices. In the event of a UPS failure, the first and second switches are in a closed state.

2. The auxiliary control electrical circuit of the container energy storage system according to claim 1, characterized in that, The battery voltage detection terminal of the BMS is connected to the UPS battery unit, and the second voltage output terminal of the BMS is connected to the input control terminal of the first switch.

3. The auxiliary control electrical circuit of the container energy storage system according to claim 1, characterized in that, The secondary circuit devices include multiple AC / DC converters. The output of the UPS is connected to the power input of the BMS via some of the AC / DC converters. The output of the AC / DC switching power supply is connected to the power input of the BMS via a diode.

4. The auxiliary control electrical circuit of the container energy storage system according to claim 1, characterized in that, The first switch selects an intermediate relay.

5. The auxiliary control electrical circuit of the container energy storage system according to claim 1, characterized in that, The second switch is a solid-state relay.

6. The auxiliary control electrical circuit of the container energy storage system according to claim 1 or 2, characterized in that, It also includes a third switch and a fourth switch. The battery terminal of the UPS is connected to the UPS battery unit via the output control terminals of the third switch and the fourth switch. The input control terminal of the fourth switch is connected to the third voltage output terminal of the BMS.

7. The auxiliary control electrical circuit of the container energy storage system according to claim 6, characterized in that, The third switch is selected as an air switch.

8. The auxiliary control electrical circuit of the container energy storage system according to claim 6, characterized in that, The fourth switch selects a DC relay.

Images