Energy storage cabinet control system

Abstract

The invention discloses an energy storage cabinet control system which comprises a control box and an interface box, a direct current load switch QF2 and a power switch QF5 are arranged on a panel of the control box, a main positive contactor KM1, a main negative contactor KM2, a battery control unit BCU and a BMS control power supply DY1 are arranged in the control box, and an alternating current isolation switch QF1 is arranged on a back plate of the interface box; the alternating current end of the energy storage converter PCS is connected to power grid side alternating current through an alternating current isolating switch QF1, the direct current end of the energy storage converter PCS is connected with a battery system through a main control circuit, and a direct current load switch QF2 and normally open contacts of a main positive contactor KM1 and a main negative contactor KM2 are arranged on the main control circuit in series; the input end of the BMS control power supply DY1 is connected to a grid-connected cabinet UPS power supply loop through a power switch QF5, and the output end of the BMS control power supply DY1 supplies power to a DC24V power supply terminal ID3; the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and DC24V electric equipment; the battery control unit BCU is connected with coils of the main positive contactor KM1 and the main negative contactor KM2 so as to control on-off of the main control circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an energy storage cabinet control system. Background Art

[0002] Energy storage cabinet is a device that can store electrical energy, usually composed of battery packs, converters, control units, etc. It can store electrical energy and release it for power supply when needed. It is usually used to provide backup power and stabilize grid voltage to achieve valley cutting and peak filling.

[0003] At present, the control part of the energy storage cabinet is deployed in a box. Since the box for installing the control components is set above the battery system, the box is large in size and weight, which is not conducive to installation. In addition, since the battery system is two groups of battery packs arranged vertically in sequence, the control components are concentrated in one box and cannot be set corresponding to the two groups of battery packs to maintain balance. At the same time, the unreasonable deployment of the control components is not conducive to the connection between the control components and the external components of the box, which is not conducive to control operations.

[0004] In addition, when the low-voltage power grid that supplies power to the user side of the energy storage cabinet is powered off, the energy storage cabinet is also powered off, and the host computer cannot obtain the status of the energy storage cabinet through the I / O modules, industrial computers, and switches in the energy storage cabinet that are connected to the host computer. It is very important to use the energy storage cabinet's own battery system to achieve emergency start-up of the energy storage cabinet so that the host computer can obtain the status of the energy storage cabinet in time. Summary of the invention

[0005] The present invention aims at solving the problems and shortcomings of the prior art and provides a novel energy storage cabinet control system.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides an energy storage cabinet control system.

[0008] The energy storage cabinet is provided with a battery system and an energy storage converter PCS. The energy storage cabinet control structure includes a control box and an interface box arranged side by side above the battery system. The energy storage converter PCS is arranged above the control box and the interface box. A DC load switch QF2 and a power switch QF5 are arranged on the control box panel. A main positive contactor KM1, a main negative contactor KM2, a battery control unit BCU and a BMS control power supply DY1 are arranged in the control box. An AC isolation switch QF1 is arranged on the back panel of the interface box.

[0009] The AC end of the energy storage converter PCS is connected to the AC power on the grid side through the AC isolation switch QF1, the DC end of the energy storage converter PCS is connected to the battery system through the main control circuit, and the DC load switch QF2 and the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are arranged in series on the main control circuit;

[0010] The input end of the BMS control power supply DY1 is connected to the power supply circuit of the grid cabinet UPS through the power switch QF5, and the power supply circuit of the grid cabinet UPS is connected to the AC power on the grid side. The output end of the BMS control power supply DY1 supplies power to the DC24V power supply terminal ID3; the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V power-consuming equipment, and the DC24V power-consuming equipment includes an I / O module, an industrial computer and a switch;

[0011] The battery control unit BCU is connected to the coils of the main positive contactor KM1 and the main negative contactor KM2, and controls the power on and off of the main positive contactor KM1 and the main negative contactor KM2 to control the on and off of the main control circuit;

[0012] When the grid-side AC power is supplied, the AC isolating switch QF1, the DC load switch QF2 and the power switch QF5 are all in the closed state; the grid-side AC power is connected to the power supply circuit of the power grid cabinet UPS, and supplies power to the DC24V power supply terminal ID3 through the BMS control power supply DY1, and then supplies power to the battery control unit BCU and the DC24V electrical equipment. The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in the connected state. At this time, the grid-side AC power is connected to the energy storage converter PCS, and the energy storage converter PCS starts to convert AC power into DC power to charge the battery system.

[0013] Preferably, the control box is further provided with a relay KA3 and a DC / DC power supply DY2, and a start button AN is further provided on the control box panel; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the normally open contact of the relay KA3 is connected in parallel with the normally open contact of the start button AN and then connected to the output end of the DC / DC power supply DY2 and the DC24V power supply terminal ID3; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; the normally open contact of the start button AN is connected to obtain the state of the start button AN; the normally open contact of the DC load switch QF2 is connected to obtain the state of the DC load switch QF2;

[0014] When the AC power on the grid side is cut off, the DC load switch QF2 is closed, the DC / DC power supply DY2 is connected to the battery system to be powered, and the start button AN is pressed. The DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, controls the relay KA3 coil to be energized, and the normally open contact of the relay KA3 is closed. The DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3. D3 supplies power to the battery control unit BCU and DC24V electrical equipment. At this time, the start button AN can be released; the battery control unit BCU obtains the status of the battery system, confirms that the battery system is in an available state, and then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to power the AC power load.

[0015] Preferably, the output end of the AC isolating switch QF1 is connected to an AC power supply switch QF3, and the AC power supply switch QF3 is arranged on the interface box panel. The AC power supply switch QF3 is connected to the auxiliary power equipment of the energy storage cabinet. When the AC power on the grid side is out of power, the AC power supply switch QF3 is manually disconnected. When the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed. The power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

[0016] Preferably, the battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system status. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is deemed to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is deemed to be in an unusable state.

[0017] Preferably, the battery control unit BCU is connected to a fire sprinkler to obtain a status of the fire sprinkler.

[0018] Preferably, when the normally open contact of the AC power supply switch QF3 is in a closed state, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0019] Preferably, the main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, and the main control input connectors B+ and B-, main control output connectors P+ and P- are arranged on the control box panel, and the main control input connector B+, fuse FU, the DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, the DC load switch QF2, the current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence.

[0020] Preferably, the battery control unit BCU is connected to the current sensor to collect the current value of the main control circuit as the current value of the battery system, and the battery control unit BCU is connected to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system.

[0021] Preferably, it also includes a status indicator light, which includes a fault indicator light HR and an operation indicator light HG. The fault indicator light HR and the operation indicator light HG are arranged on the control box panel. The battery control unit BCU is connected to and controls the fault indicator light HR and the operation indicator light HG to indicate the status of the battery control unit BCU.

[0022] Preferably, the battery control unit BCU is connected to the normally open contact of the intermediate relay KA1, and the coil of the intermediate relay KA1 is controlled by the normally open contact of the AC power supply switch QF3 to be energized or de-energized; it also includes a power indicator light HW, which is controlled by the normally open contact of the relay KA3 and the normally open contact of the intermediate relay KA1 in parallel to be energized or de-energized, that is, the power indicator light HW lights up when the AC power supply switch QF3 is closed or the relay KA3 is energized. Preferably, the battery control unit BCU is connected to the normally open contact of the intermediate relay KA1, and the coil of the intermediate relay KA1 is controlled by the normally open contact of the AC power supply switch QF3 to be energized or de-energized; it also includes a power indicator light HW, which is controlled by the normally open contact of the relay KA3 and the normally open contact of the intermediate relay KA1 in parallel to be energized or de-energized, that is, the power indicator light HW lights up when the AC power supply switch QF3 is closed or the relay KA3 is energized.

[0023] The positive and progressive effects of the present invention are:

[0024] The energy storage cabinet control system provided by the present invention comprises a control box and an interface box which are arranged side by side above the battery system. The components involved in the control are mainly deployed in the control box, and the components that need to be connected to the outside are mainly deployed in the interface box, which is beneficial to the control operation and the connection with the outside; the reasonable split deployment is beneficial to the installation of the control box and the interface box. The BMS control power supply DY1 which supplies power to the DC24V power supply terminal ID3, the input end of the BMS control power supply DY1 is connected to the power supply circuit of the grid-connected cabinet UPS through the power switch QF5, the power supply circuit of the grid-connected cabinet UPS is connected to the grid-side AC power and the UPS power supply, and the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V electrical equipment.

[0025] Furthermore, a DC / DC power supply DY2 connected to the battery system of the energy storage cabinet is provided; the connection and disconnection of the DC / DC power supply DY2 and the DC24V power supply terminal ID3 are controlled by the start button AN and the relay KA3. When the AC power on the grid side is cut off, the start button AN is pressed, and the DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the coil of the control relay KA3 is energized, and the DC / DC power supply DY2 supplies power to the battery control unit BCU and the DC24V The electrical equipment is supplied with stable power; the industrial computer and switch of the energy storage cabinet are powered on and work, and maintain the connection with the host computer; at the same time, the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state, then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage converter PCS, and the energy storage converter PCS starts to convert DC power into AC power to supply power to the AC power load, thereby realizing the emergency start of the energy storage cabinet.

[0026] Furthermore, when the AC power on the grid side is restored, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, and the normally open contact of the relay KA3 opens; the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3 and switches back to power supply by the AC power on the grid side. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a layout diagram of an energy storage cabinet of an energy storage cabinet control system according to an embodiment of the present invention;

[0028] Figure 2 A control box panel layout diagram of an energy storage cabinet control system according to an embodiment of the present invention;

[0029] Figure 3This is a layout diagram of an interface box panel of an energy storage cabinet control system according to an embodiment of the present invention;

[0030] Figure 4 This is a layout diagram of the back panel of the interface box of the energy storage cabinet control system according to an embodiment of the present invention;

[0031] Figure 5 A power supply circuit diagram of an energy storage cabinet control system according to an embodiment of the present invention;

[0032] Figure 6 A control circuit diagram of an energy storage cabinet control system according to an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection of DC24V electrical equipment in the energy storage cabinet according to an embodiment of the present invention;

[0034] Figure 8 The figure is a schematic diagram of the connection of the power indicator light according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 8 This embodiment provides an energy storage cabinet control system.

[0037] The energy storage cabinet is provided with a battery system and an energy storage converter PCS. The energy storage cabinet control structure includes a control box and an interface box arranged side by side above the battery system. The energy storage converter PCS is arranged above the control box and the interface box. A DC load switch QF2 and a power switch QF5 are arranged on the control box panel. The control box is provided with a main positive contactor KM1, a main negative contactor KM2, a battery control unit BCU and a BMS control power supply DY1. An AC isolation switch QF1 is arranged on the back panel of the interface box.

[0038] The AC end of the energy storage converter PCS is connected to the AC power on the grid side through the AC isolation switch QF1, and the DC end of the energy storage converter PCS is connected to the battery system through the main control circuit. The DC load switch QF2 and the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are arranged in series on the main control circuit;

[0039] The input end of the BMS control power supply DY1 is connected to the UPS power supply circuit of the grid cabinet through the power switch QF5. The UPS power supply circuit of the grid cabinet is connected to the AC power on the grid side. The output end of the BMS control power supply DY1 supplies power to the DC24V power supply terminal ID3. The DC24V power supply terminal ID3 supplies power to the battery control unit BCU and DC24V power-consuming equipment. The DC24V power-consuming equipment includes I / O modules, industrial computers and switches.

[0040] The battery control unit BCU is connected to the coils of the main positive contactor KM1 and the main negative contactor KM2, and controls the power on and off of the main positive contactor KM1 and the main negative contactor KM2 to control the on and off of the main control circuit;

[0041] When the grid-side AC power is supplied, the AC isolation switch QF1, the DC load switch QF2 and the power switch QF5 are all in the closed state; the grid-side AC power is connected to the power supply circuit of the power cabinet UPS, and supplies power to the DC24V power supply terminal ID3 through the BMS control power supply DY1, and then supplies power to the battery control unit BCU and the DC24V electrical equipment. The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in the connected state. At this time, the grid-side AC power is connected to the energy storage converter PCS, and the energy storage converter PCS starts to convert AC power into DC power to charge the battery system.

[0042] In some embodiments, a relay KA3 and a DC / DC power supply DY2 are further provided in the control box, and a start button AN is also provided on the control box panel; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the normally open contact of the relay KA3 is connected in parallel with the normally open contact of the start button AN and then connected to the output end of the DC / DC power supply DY2 and the DC24V power supply terminal ID3; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; the normally open contact of the start button AN is connected to obtain the state of the start button AN; the normally open contact of the DC load switch QF2 is connected to obtain the state of the DC load switch QF2;

[0043] When the AC power is cut off on the grid side, the DC load switch QF2 is closed, the DC / DC power supply DY2 is connected to the battery system to be powered, and the start button AN is pressed. The DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the control relay KA3 coil is energized. The normally open contact of the relay KA3 is closed, and the DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU and the DC24V electrical equipment. At this time, the start button AN can be released; the battery control unit BCU obtains the battery system status and confirms that the battery system is in a usable state, then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage converter PCS, and the energy storage converter PCS starts to convert DC power into AC power to supply power to the AC power load.

[0044] When the AC power supply on the grid side just stops, the UPS power supply connected to the UPS power supply circuit of the grid cabinet can supply power to the DC24V power supply terminal ID3 through the BMS control power supply DY1 in a short time. Since the UPS power supply has limited power and short power supply time, during this power supply time, operate the start button AN for emergency start, and power it through the battery system, which can realize non-stop emergency start when the AC power supply on the grid side stops.

[0045] In some embodiments, the output end of the AC isolating switch QF1 is connected to the AC power supply switch QF3, which is arranged on the interface box panel. The AC power supply switch QF3 is connected to the auxiliary power equipment of the energy storage cabinet. When the AC power on the grid side is off, the AC power supply switch QF3 is manually disconnected. When the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed. The power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

[0046] In some embodiments, the battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system status. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is deemed to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is deemed to be in an unusable state.

[0047] In some embodiments, the battery control unit BCU is connected to a fire sprinkler to obtain the status of the fire sprinkler. If the fire sprinkler is in an on state, the battery system is in an unavailable state.

[0048] In some embodiments, when the normally open contact of the AC power supply switch QF3 is in a closed state, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0049] In some embodiments, the main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, and the main control input connectors B+ and B-, main control output connectors P+ and P- are arranged on the control box panel, and the main control input connector B+, fuse FU, DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, DC load switch QF2, current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence.

[0050] In some embodiments, the battery control unit BCU is connected to a current sensor to collect the current value of the main control circuit as the current value of the battery system, and the battery control unit BCU is connected to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system.

[0051] In some embodiments, it also includes a status indicator light, which includes a fault indicator light HR and an operation indicator light HG. The fault indicator light HR and the operation indicator light HG are set on the control box panel. The battery control unit BCU is connected to and controls the fault indicator light HR and the operation indicator light HG to indicate the status of the battery control unit BCU.

[0052] In some embodiments, the battery control unit BCU is connected to the normally open contact of the intermediate relay KA1, and the coil of the intermediate relay KA1 is controlled by the normally open contact of the AC power supply switch QF3 to be energized or de-energized, that is, the battery control unit BCU confirms the open or closed state of the AC power supply switch QF3 by the open or closed state of the normally open contact of the intermediate relay KA1; and also includes a power indicator light HW, which is controlled by the normally open contact of the relay KA3 and the normally open contact of the intermediate relay KA1 in parallel to be energized or de-energized, that is, the power indicator light HW lights up when the AC power supply switch QF3 is closed or the relay KA3 is energized.

[0053] In some embodiments, an I / O module, an industrial computer and a switch are provided in the interface box. The I / O module, the industrial computer and the switch are all DC24V power-consuming devices. The I / O module and the industrial computer are both connected to the switch, and the switch communicates with the host computer. The DC24V power supply terminal ID3 supplies power to the I / O module, the industrial computer and the switch. Cable interfaces KAM and KDM are provided on the interface box panel. The cable interfaces KAM and KDM connect the I / O module and the industrial computer to realize signal input / output and DC24V power supply access.

[0054] In some embodiments, a plurality of network ports are provided on the interface box panel, the network ports are connected to a switch, and the network ports can be connected to external devices such as an energy storage inverter PCS, a battery control unit BCU or a touch screen via a network cable.

[0055] In some embodiments, cable interfaces GAM and GBM are provided on the control box panel, and the cable interfaces GAM and GBM are connected to the battery control unit BCU to realize input / output and communication of control signals.

[0056] In some embodiments, a network port COM is also provided on the control box panel, and the battery control unit BCU is connected to the network port COM and communicates with the switch through the network port COM.

[0057] In summary, the energy storage cabinet control system provided by the present invention includes a control box and an interface box arranged side by side above the battery system. The components involved in the control are mainly deployed in the control box, and the components that need to be connected to the outside are mainly deployed in the interface box, which is conducive to control operation and connection with the outside; reasonable split deployment is conducive to the installation of the control box and the interface box. The BMS control power supply DY1 that supplies power to the DC24V power supply terminal ID3, the input end of the BMS control power supply DY1 power supply is connected to the grid cabinet UPS power supply circuit through the power switch QF5, the grid cabinet UPS power supply circuit is connected to the grid side AC and UPS power supply, and the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and DC24V electrical equipment.

[0058] Furthermore, a DC / DC power supply DY2 connected to the battery system of the energy storage cabinet is provided; the connection and disconnection of the DC / DC power supply DY2 and the DC24V power supply terminal ID3 are controlled by the start button AN and the relay KA3. When the AC power on the grid side is cut off, the start button AN is pressed, and the DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the coil of the control relay KA3 is energized, and the DC / DC power supply DY2 supplies power to the battery control unit BCU and the DC24V The electrical equipment is supplied with stable power; the industrial computer and switch of the energy storage cabinet are powered on and work, and maintain the connection with the host computer; at the same time, the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state, then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage converter PCS, and the energy storage converter PCS starts to convert DC power into AC power to supply power to the AC power load, thereby realizing the emergency start of the energy storage cabinet.

[0059] Furthermore, when the AC power on the grid side is restored, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, and the normally open contact of the relay KA3 opens; the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3 and switches back to power supply by the AC power on the grid side.

[0060] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An energy storage cabinet control system, characterized in that: The energy storage cabinet is provided with a battery system and an energy storage converter PCS. The energy storage cabinet control structure includes a control box and an interface box arranged side by side above the battery system. The energy storage converter PCS is arranged above the control box and the interface box. A DC load switch QF2 and a power switch QF5 are arranged on the control box panel. A main positive contactor KM1, a main negative contactor KM2, a battery control unit BCU and a BMS control power supply DY1 are arranged in the control box. An AC isolation switch QF1 is arranged on the back panel of the interface box. The AC end of the energy storage converter PCS is connected to the AC power on the grid side through the AC isolation switch QF1, the DC end of the energy storage converter PCS is connected to the battery system through the main control circuit, and the DC load switch QF2 and the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are arranged in series on the main control circuit; The input end of the BMS control power supply DY1 is connected to the power supply circuit of the grid cabinet UPS through the power switch QF5, and the power supply circuit of the grid cabinet UPS is connected to the AC power on the grid side. The output end of the BMS control power supply DY1 supplies power to the DC24V power supply terminal ID3; the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V power-consuming equipment, and the DC24V power-consuming equipment includes an I / O module, an industrial computer and a switch; The battery control unit BCU is connected to the coils of the main positive contactor KM1 and the main negative contactor KM2, and controls the power on and off of the main positive contactor KM1 and the main negative contactor KM2 to control the on and off of the main control circuit; When the grid-side AC power is supplied, the AC isolating switch QF1, the DC load switch QF2 and the power switch QF5 are all in the closed state; the grid-side AC power is connected to the power supply circuit of the power grid cabinet UPS, and supplies power to the DC24V power supply terminal ID3 through the BMS control power supply DY1, and then supplies power to the battery control unit BCU and the DC24V electrical equipment. The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in the connected state. At this time, the grid-side AC power is connected to the energy storage converter PCS, and the energy storage converter PCS starts to convert AC power into DC power to charge the battery system.

2. The energy storage cabinet control system according to claim 1, characterized in that: The control box is also provided with a relay KA3 and a DC / DC power supply DY2, and a start button AN is also provided on the control box panel; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the normally open contact of the relay KA3 is connected in parallel with the normally open contact of the start button AN and then connected to the output end of the DC / DC power supply DY2 and the DC24V power supply terminal ID3; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; the normally open contact of the start button AN is connected to obtain the state of the start button AN; the normally open contact of the DC load switch QF2 is connected to obtain the state of the DC load switch QF2; When the AC power on the grid side is cut off, the DC load switch QF2 is closed, the DC / DC power supply DY2 is connected to the battery system to be powered, and the start button AN is pressed. The DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, controls the relay KA3 coil to be energized, and the normally open contact of the relay KA3 is closed. The DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3. D3 supplies power to the battery control unit BCU and DC24V electrical equipment. At this time, the start button AN can be released; the battery control unit BCU obtains the status of the battery system, confirms that the battery system is in an available state, and then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to power the AC power load.

3. The energy storage cabinet control system according to claim 2, characterized in that: The output end of the AC isolating switch QF1 is connected to an AC power supply switch QF3, which is arranged on the interface box panel. The AC power supply switch QF3 is connected to the auxiliary power equipment of the energy storage cabinet. When the AC power on the grid side is cut off, the AC power supply switch QF3 is manually disconnected. When the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed. The power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

4. The energy storage cabinet control system according to claim 2, characterized in that: The battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system status. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is considered to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is considered to be in an unusable state.

5. The energy storage cabinet control system according to claim 2, characterized in that: The battery control unit BCU is connected to a fire sprinkler device to obtain a status of the fire sprinkler device.

6. The energy storage cabinet control system according to any one of claims 3, 4 or 5, characterized in that: When the normally open contact of the AC power supply switch QF3 is in a closed state, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

7. The energy storage cabinet control system according to claim 4, characterized in that: The main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, and the main control input connectors B+ and B-, main control output connectors P+ and P- are arranged on the control box panel, and the main control input connector B+, fuse FU, the DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, the DC load switch QF2, the current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence.

8. The energy storage cabinet control system according to claim 7, characterized in that: The battery control unit BCU is connected to the current sensor to collect the current value of the main control circuit as the current value of the battery system, and the battery control unit BCU is connected to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system.

9. The energy storage cabinet control system according to claim 1, characterized in that: It also includes status indicator lights, which include a fault indicator light HR and an operation indicator light HG. The fault indicator light HR and the operation indicator light HG are arranged on the control box panel. The battery control unit BCU is connected to and controls the fault indicator light HR and the operation indicator light HG to indicate the status of the battery control unit BCU.

10. The energy storage cabinet control system according to claim 3, characterized in that: The battery control unit BCU is connected to the normally open contact of the intermediate relay KA1, and the coil of the intermediate relay KA1 is controlled by the normally open contact of the AC power supply switch QF3 to be energized or de-energized; it also includes a power indicator light HW, and the power indicator light HW is controlled in parallel by the normally open contact of the relay KA3 and the normally open contact of the intermediate relay KA1 to be energized or de-energized, that is, the power indicator light HW lights up when the AC power supply switch QF3 is closed or the relay KA3 is energized.

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