Energy storage system and one-key starting method thereof

Abstract

The application provides a kind of energy storage system and one-key starting method thereof, comprising one-key starting switch, grid-connected switch, energy storage converter, battery system, AC / DC switching power supply, DC / DC switching power supply and EMS controller; the battery system comprises battery interior, high-voltage relay and battery exterior, and the battery interior and the battery exterior are connected to the two ends of the coil of the high-voltage relay respectively; the two ends of the grid-connected switch are connected to the grid side and the AC / DC switching power supply through AC bus respectively; the AC side of the energy storage converter is connected to the AC bus, and the DC side of the energy storage converter is connected to the DC / DC switching power supply through external DC bus; the battery exterior is connected to the external DC bus; the two ends of the one-key starting switch are connected to the internal DC bus connected to the battery interior and the DC / DC switching power supply respectively; the AC / DC switching power supply is connected to the power load and the EMS controller; the EMS controller is connected to the one-key starting switch, the energy storage converter, the high-voltage relay and the grid-connected switch for control. The application can realize fast and safe starting of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage system, in particular to an energy storage system and a one-key starting method thereof. BACKGROUND

[0002] The conventional starting process of the energy storage system is as follows: each auxiliary source of the device is powered on, the high voltage of the energy storage battery unit (main loop relay is closed), the energy storage converter PCS is started, and the energy storage system is set to run according to the EMS management system.

[0003] The existing starting process of the energy storage system is relatively complicated, requires manual intervention, and requires the operator to have a certain understanding of the system, which cannot meet the user's requirement of simplified operation. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an energy storage system and a one-key starting method thereof, to realize one-key starting of the system, so that any authorized personnel can quickly and safely start up the system, and improve the operability of the system.

[0005] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0006] An energy storage system, comprising a one-key starting switch, a grid-connected switch, an energy storage converter, a battery system, an AC / DC switch power supply, a DC / DC switch power supply and an EMS controller;

[0007] The battery system comprises a battery interior, a high-voltage relay and a battery exterior, and the battery interior and the battery exterior are connected to both ends of the coil of the high-voltage relay, respectively;

[0008] Both ends of the grid-connected switch are connected to the grid side and the input end of the AC / DC switch power supply through an AC bus, respectively;

[0009] The AC side of the energy storage converter is connected to the AC bus connected between the grid-connected switch and the input end of the AC / DC switch power supply, and the DC side of the energy storage converter is connected to the input end of the DC / DC switch power supply through an external DC bus;

[0010] The battery exterior is connected to the external DC bus connected between the energy storage converter and the input end of the DC / DC switch power supply;

[0011] Both ends of the one-key starting switch are connected to the battery interior and the input end of the DC / DC switch power supply through an internal DC bus, respectively;

[0012] The output end of the AC / DC switch power supply and the output end of the DC / DC switch power supply are connected to a power load and the EMS controller, respectively;

[0013] The EMS controller is in control connection with the one-key start switch, the energy storage converter, the high-voltage relay and the grid-connected switch.

[0014] To solve the above technical problems, another technical solution provided by the application is:

[0015] A one-key start method of an energy storage system, applied to the energy storage system, comprising the following steps:

[0016] S1, when the system is shut down, the one-key start switch is pressed, the battery inside the battery system outputs electric quantity, the internal DC bus is turned on, the DC / DC switch power supply works and outputs electric quantity, the EMS controller and the power load start to work;

[0017] S2, after the EMS controller is initialized and it is identified that the one-key start switch is in the pressed state, an upper high-voltage instruction is issued to the high-voltage relay of the battery system to control the coil of the high-voltage relay to be attracted, the external DC bus is turned on, and the high-voltage relay feeds back an attraction signal to the EMS controller;

[0018] S3, after the EMS controller receives the attraction signal, the one-key start switch is controlled to be popped up, the electric quantity of the battery system is switched from the battery inside to the battery outside, and the DC / DC switch power supply continues to supply power to the EMS controller and the power load;

[0019] S4, after the system is in the upper high-voltage state, the EMS controller collects and analyzes the voltage amplitude, frequency and phase sequence of the grid side:

[0020] When the voltage of the grid side is normal, the EMS controller controls the grid side grid-connected switch to be closed, the AC bus is turned on, the grid side electric quantity is converted into DC power by the AC / DC switch power supply to supply power to the EMS controller and the power load, the EMS controller sets the energy storage converter to be in the grid-connected mode, and issues a start instruction to the energy storage converter, the energy storage converter starts to run, and charges and discharges the battery system according to different power values issued by the EMS controller in different time periods;

[0021] When the voltage of the grid side is abnormal, the EMS controller controls the grid side grid-connected switch to be opened, the system has no external voltage input, and an independent micro-grid is formed, the EMS controller sets the energy storage converter to be in the off-grid mode, and issues a start instruction to the energy storage converter, the energy storage converter starts to run to establish a micro-grid AC bus power supply.

[0022] The application has the beneficial effects that the application provides an energy storage system and a one-key starting method thereof, a one-key starting switch is arranged on the direct current side of the system, when the system is stopped, the one-key starting switch is pressed to first connect the internal direct current bus, the energy storage battery cell of the battery system is connected in series, the electric quantity in the battery is first output through the DC / DC switching power supply to start the EMS controller and the power load, the EMS controller starts to work to high voltage on the high voltage relay to convert the auxiliary power supply from the inside of the battery to the output of the system direct current bus end, that is, the outside of the battery, to continue to maintain the normal work of the EMS controller and the power load to complete the high voltage process of the system, then the on-off of the grid-side switching of the system is controlled according to the voltage condition of the grid side, and it is selected whether the energy storage converter works in the grid-connected mode or the off-grid mode, and finally the stable operation of the system is realized. The whole process adopts the one-key starting mode to first establish the auxiliary power supply to make each device in the system obtain the working power supply, optimizes the EMS control management strategy, controls the intelligent operation of the subsequent system through the identification and analysis of the current state of the system, realizes that any authorized person can quickly and safely start up the system, and improves the operability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a circuit schematic diagram of an energy storage system of the embodiment of the application.

[0024] Figure 2 It is a system topology diagram of an energy storage system of the embodiment of the application.

[0025] Figure 3 It is a system communication diagram of an energy storage system of the embodiment of the application.

[0026] Figure 4 It is a whole flowchart of a one-key starting method of an energy storage system of the embodiment of the application.

[0027] Figure 5 It is a specific flowchart of a one-key starting method of an energy storage system of the embodiment of the application.

[0028] Label explanation:

[0029] 10, battery system; 11, inside of the battery; 12, outside of the battery; 13, internal direct current bus; 14, external direct current bus; 15, feedback signal pin; 16, pop-up control pin;

[0030] 20, DC / DC switching power supply; 30, AC / DC switching power supply; 31, alternating current bus; 40, EMS controller; 50, BMS controller; 60, power load; 71, photovoltaic inverter; 72, photovoltaic module; 81, fan controller; 82, fan module;

[0031] PCS, energy storage converter; QF1, grid-connected switch; QF2, one-key start switch; K, high-voltage relay; D1, first anti-reverse diode; D2, second anti-reverse diode; D3, third anti-reverse diode; FU, fuse. DETAILED DESCRIPTION

[0032] To make the technical contents of the present application, the purposes and effects achieved more clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0033] Please refer to Figures 1 to 3 An energy storage system, comprising a one-key start switch, a grid-connected switch, an energy storage converter, a battery system, an AC / DC switching power supply, a DC / DC switching power supply and an EMS controller;

[0034] The battery system comprises a battery interior, a high-voltage relay and a battery exterior, and the battery interior and the battery exterior are connected to both ends of the coil of the high-voltage relay, respectively;

[0035] Both ends of the grid-connected switch are connected to the power grid side and the input end of the AC / DC switching power supply through an AC bus, respectively;

[0036] The AC side of the energy storage converter is connected to the AC bus connected between the grid-connected switch and the input end of the AC / DC switching power supply, and the DC side of the energy storage converter is connected to the input end of the DC / DC switching power supply through an external DC bus;

[0037] The battery exterior is connected to the external DC bus connected between the energy storage converter and the input end of the DC / DC switching power supply;

[0038] Both ends of the one-key start switch are connected to the battery interior and the input end of the DC / DC switching power supply through an internal DC bus, respectively;

[0039] The output end of the AC / DC switching power supply and the output end of the DC / DC switching power supply are connected to a power load and the EMS controller, respectively;

[0040] The EMS controller is connected to the one-key start switch, the energy storage converter, the high-voltage relay and the grid-connected switch for control.

[0041] Further, the battery interior is a cell series end;

[0042] The battery exterior is a DC bus end.

[0043] From the above description, the beneficial effects of the present application are that: by setting a one-key starting switch on the system DC side, when the system is shut down, the one-key starting switch can be pressed to first connect the internal DC bus, and the energy storage battery cell of the battery system is connected in series, that is, the internal battery power is first output through the DC / DC switching power supply to start the EMS controller and the power load, and after the EMS controller starts to work, the high voltage on the high voltage relay is used to convert the auxiliary power supply from the internal battery to the system DC bus end, that is, the external battery output is used to continue to maintain the normal work of the EMS controller and the power load, so as to complete the high voltage process of the system, and then according to the voltage condition of the power grid side, the on-off of the system AC side grid-connected switch is controlled, and it is selected whether the energy storage converter works in grid-connected mode or off-grid mode, and finally the stable operation of the system is realized. The whole process adopts the one-key starting mode to first establish the auxiliary power supply to make the system devices obtain the working power supply, optimizes the EMS control management strategy, controls the intelligent operation of the subsequent system through the identification and analysis of the current state of the system, realizes that any authorized person can quickly and safely start up the system, and improves the operability of the system.

[0044] Further, it further comprises a BMS controller;

[0045] The BMS controller is electrically connected with the output end of the AC / DC switching power supply and the output end of the DC / DC switching power supply, and is connected with the coil of the high voltage relay and the EMS controller.

[0046] From the above description, by adding the BMS controller, the battery system is uniformly managed, so that when the EMS controller controls the system high voltage, the high voltage relay coil can be attracted by the BMS controller, the system high voltage is completed, and the attraction signal is fed back to the EMS controller, and the BMS controller can also analyze the battery state of each battery cell in the battery system in real time, so that the high voltage control is only executed under the condition that the battery system is normal, and the safety of system operation is ensured.

[0047] Further, the one-key starting switch comprises a feedback signal pin and a pop-up control pin;

[0048] The feedback signal pin and the pop-up control pin are connected with the EMS controller.

[0049] From the above description, the feedback signal pin of the one-key starting switch is used to feed back the pressed state to the EMS controller, so that the EMS controller can issue a pop-up instruction to the pop-up control pin to control the disconnection of the one-key starting switch.

[0050] Further, the first anti-reverse diode is connected in series between the external DC bus and the energy storage converter, and the positive terminal of the first anti-reverse diode is connected to the energy storage converter, and the negative terminal of the first anti-reverse diode is connected to the input terminal of the DC / DC switching power supply.

[0051] As can be seen from the above description, the first anti-reverse diode can be used to prevent the battery internal output from flowing back to the external DC bus when the EMS controller has not issued a pop-up command to the one-key start switch to disconnect the battery internal output after high voltage on the system.

[0052] Further, the output terminal of the DC / DC switching power supply and the output terminal of the AC / DC switching power supply are connected in parallel to the input terminal of the EMS controller and the power load through the second anti-reverse diode and the third anti-reverse diode respectively.

[0053] The positive terminal of the second anti-reverse diode is connected to the output terminal of the DC / DC switching power supply, the negative terminal of the second anti-reverse diode is connected to the input terminal of the EMS controller and the power load, the positive terminal of the third anti-reverse diode is connected to the output terminal of the AC / DC switching power supply, and the negative terminal of the third anti-reverse diode is connected to the input terminal of the EMS controller and the power load.

[0054] As can be seen from the above description, the second anti-reverse diode can be used to prevent the grid-side AC power converted and output by the AC / DC switching power supply from flowing back to the DC side of the battery system, and the third anti-reverse diode can be used to prevent the battery system power output by the DC / DC switching power supply from flowing back to the grid-side AC side.

[0055] Further, a fuse is connected in series between the internal DC bus and the one-key start switch.

[0056] As can be seen from the above description, the fuse can be used to effectively protect the battery system when the internal DC bus is short-circuited.

[0057] Further, the photovoltaic system is further included.

[0058] The photovoltaic system includes a photovoltaic inverter and a photovoltaic assembly, and the photovoltaic assembly is connected in parallel to the AC bus through the photovoltaic inverter.

[0059] The photovoltaic inverter is connected to the EMS controller for control.

[0060] As can be seen from the above description, the addition of the photovoltaic system can be used for photovoltaic power generation to improve the overall performance of the energy storage system.

[0061] Further, the fan system is further included.

[0062] The fan system comprises a fan controller and a fan assembly, which is connected in parallel to the AC bus through the fan controller;

[0063] The fan controller is connected to the EMS controller.

[0064] As can be seen from the above description, the addition of the fan system can be used for wind power generation and improve the overall performance of the energy storage system.

[0065] Please refer to Figures 4 to 5 A one-key starting method of an energy storage system, applied to the energy storage system, comprising the following steps:

[0066] S1, when the system is shut down, a one-key starting switch is pressed, the battery inside the battery system outputs power, the internal DC bus is turned on, the DC / DC switching power supply works and outputs power, the EMS controller and the power load start to work;

[0067] S2, the EMS controller completes initialization and identifies that the one-key starting switch is in a pressed state, sends a high-voltage command to the high-voltage relay of the battery system, controls the coil of the high-voltage relay to be attracted, the external DC bus is turned on, and the high-voltage relay feeds back an attraction signal to the EMS controller;

[0068] S3, after the EMS controller receives the attraction signal, the one-key starting switch is controlled to be popped open, the power of the battery system is switched from the battery inside to the battery outside, and the DC / DC switching power supply continues to supply power to the EMS controller and the power load;

[0069] S4, after the system is powered up, the EMS controller collects and analyzes the voltage amplitude, frequency and phase sequence of the power grid side:

[0070] When the voltage of the power grid side is normal, the EMS controller controls the grid-side grid-connected switch to be closed, the AC bus is turned on, the power of the power grid side is converted into DC power by the AC / DC switching power supply to supply power to the EMS controller and the power load, the EMS controller sets the energy storage converter to be in a grid-connected mode, sends a start command to the energy storage converter, the energy storage converter starts to run, and charges and discharges the battery system according to different power values sent by the EMS controller in different time periods;

[0071] When the grid-side voltage is abnormal, the EMS controller controls the grid-side grid-connected switch to be turned off, the system has no external voltage input, an independent micro-grid is formed, meanwhile, the EMS controller sets the energy storage converter to be in off-grid mode, and issues a start-up instruction to the energy storage converter, the energy storage converter starts to run, and the micro-grid AC bus power supply is established.

[0072] From the above description, the beneficial effects of the present application are that: based on the same technical concept, a one-key start method of an energy storage system is provided, which is applied to the above-mentioned energy storage system, by setting a one-key start switch on the DC side of the system, when the system is shut down, the one-key start switch can be pressed to first connect the internal DC bus, the energy storage battery cells of the battery system are connected in series, the internal power of the battery is first output through the DC / DC switching power supply to start the EMS controller and the power load, after the EMS controller starts to work, the high voltage on the high voltage relay is controlled to convert the auxiliary power supply from the internal battery to the external DC bus of the system, that is, the internal battery, to continue to maintain the normal work of the EMS controller and the power load, so as to complete the high voltage process of the system, then the on-off of the grid-connected switch on the AC side of the system is controlled according to the voltage of the grid side, and it is selected whether the energy storage converter works in grid-connected mode or off-grid mode, and finally the stable operation of the system is realized. The whole process adopts the one-key start mode to first establish the auxiliary power supply to make each device in the system obtain working power, optimizes the EMS control management strategy, analyzes the current state of the system, thereby controls the intelligent operation of the subsequent system, realizes that any authorized person can quickly and safely start up the system, and improves the operability of the system.

[0073] The energy storage system and the one-key start method thereof of the present application are applied to the scene of quickly, portably and safely starting the energy storage system under the condition of shutdown, which will be described below in combination with specific embodiments.

[0074] Please refer to Figure 1 , the first embodiment of the present application is:

[0075] An energy storage system, as shown in Figure 1 , includes a one-key start switch QF2, a grid-connected switch QF1, an energy storage converter PCS, a battery system 10, an AC / DC switching power supply 30, a DC / DC switching power supply 20 and an EMS controller 40.

[0076] The battery system 10 includes a battery internal part 11, a high-voltage relay K and a battery external part 12, and the battery internal part 11 and the battery external part 12 are connected to both ends of the coil of the high-voltage relay K, in this embodiment, the battery internal part 11 is a cell series end, and the battery external part 12 is a DC bus end; both ends of the grid-connected switch QF1 are connected to the grid side and the input end of the AC / DC switch power supply 30 through the AC bus 31; the AC side of the energy storage converter PCS is connected to the AC bus 31 connected between the input end of the grid-connected switch QF1 and the input end of the AC / DC switch power supply 30, and the DC side of the energy storage converter PCS is connected to the input end of the DC / DC switch power supply 20 through the external DC bus 14; the battery external part 12 is connected to the external DC bus 14 connected between the input end of the energy storage converter PCS and the input end of the DC / DC switch power supply 20; both ends of the one-key start switch QF2 are connected to the battery internal part 11 and the input end of the DC / DC switch power supply 20 through the internal DC bus 13, wherein, in this embodiment, the one-key start switch QF2 includes a feedback signal pin 15 and a pop-up control pin 16, and the feedback signal pin 15 and the pop-up control pin 16 are connected to the EMS controller 40; the output end of the AC / DC switch power supply 30 and the output end of the DC / DC switch power supply 20 are connected to the power load 60 and the EMS controller 40; the EMS controller 40 is connected to the one-key start switch QF2, the energy storage converter PCS, the high-voltage relay K and the grid-connected switch QF1.

[0077] That is, in this embodiment, by setting a one-key start switch QF2 on the DC side of the system, when the system is shut down, the one-key start switch QF2 can be pressed to first connect the internal DC bus 13, and the energy of the energy storage battery cell series end of the battery system 10, that is, the battery internal part 11, is output through the DC / DC switch power supply 20 to start the EMS controller 40 and the power load 60, and after the EMS controller 40 is started, the high voltage on the high-voltage relay K is used to convert the auxiliary power supply from the battery internal part 11 to the system DC bus end, that is, the battery external part 12, to continue to maintain the normal work of the EMS controller 40 and the power load 60, so as to complete the high-voltage process of the system, and then the on-off of the grid-connected switch QF1 on the AC side of the system is controlled according to the voltage of the grid side, and it is selected whether the energy storage converter PCS works in the grid-connected mode or the off-grid mode, and finally the stable operation of the system is realized. The whole process adopts the one-key start mode to first establish the auxiliary power supply to make each device in the system obtain the working power supply, optimizes the EMS control management strategy, analyzes the current state of the system, thereby controls the intelligent operation of the subsequent system, realizes that any authorized person can quickly and safely start up the system, and improves the operability of the system.

[0078] Wherein, after the one-key starting switch QF2 is pressed, the feedback signal pin 15 of the one-key starting switch QF2 will feed back the pressed state to the EMS controller 40, so that the EMS controller 40 will issue a coil closing instruction to the high-voltage relay K according to the pressed state of the feedback signal pin 15, so that the high-voltage relay K coil is closed, the system high voltage is successful, and then the EMS controller 40 will issue a pop-up instruction to the pop-up control pin 16 of the one-key starting switch QF2 according to the coil closing state fed back by the high-voltage relay K, to control the one-key starting switch QF2 to be disconnected, so as to avoid the EMS controller 40 and the electrical load 60 to take power from the battery inside 11 all the time, that is, the battery inside 11 is equivalent to replace the UPS to meet the black start of the system, and the battery inside 11 serves as the power support in the system initialization and black start process; when the EMS controller 40 starts to work, the battery system 10 high voltage is controlled, the battery inside 11 is switched to the battery outside 12, the power taken from the battery inside 11 is cut off, and the situation of the power grid side can be combined to select whether to take power from the outside or the energy storage battery; when the power is taken from the outside, the high-voltage relay K coil can also be controlled to be disconnected, that is, the battery system 10 high voltage is avoided, so as to avoid the battery system 10 to be on standby for a long time to cause the battery to feed power; in addition, when multiple electric cabinets are used in parallel, the unbalance between the electric cabinets caused by taking power from the inside of one electric cabinet for a long time can also be avoided.

[0079] In addition, as shown in Figure 1 In the embodiment, a BMS controller 50 is further included; the BMS controller 50 is electrically connected with the output end of the AC / DC switching power supply 30 and the output end of the DC / DC switching power supply 20, and is in control connection with the coil of the high-voltage relay K and the EMS controller 40.

[0080] That is, the BMS controller 50 is added to uniformly manage the battery system 10; when the EMS controller 40 controls the system high voltage, the BMS controller 50 can first issue a high-voltage control instruction to the BMS controller 50 to control the high-voltage relay K coil to be attracted, complete the system high voltage, and feed back the attraction signal to the EMS controller 40; at the same time, the BMS controller 50 can also analyze the battery state of each battery cell in the battery system 10 in real time, and only when the battery system 10 is normal, the high-voltage control is performed, so as to ensure the safety of the system operation.

[0081] Please refer to Figures 1 to 3 The second embodiment of the present application is:

[0082] A kind of energy storage system, based on the above embodiment one, in the embodiment, as shown in Figure 1

[0083] ​A first reverse protection diode D1 is connected in series on the external DC bus 14 between the energy storage converter PCS and the input terminal of the DC / DC switching power supply 20. The positive terminal of the first reverse protection diode D1 is connected to the energy storage converter PCS, and the negative terminal of the first reverse protection diode D1 is connected to the input terminal of the DC / DC switching power supply 20. The output terminals of the DC / DC switching power supply 20 and the AC / DC switching power supply 30 are respectively connected in parallel to the input terminals of the electrical load 60 and the EMS controller 40 through the second reverse protection diode D2 and the third reverse protection diode D3.

[0084] The positive terminal of the second anti-reverse diode D2 is connected to the output terminal of the DC / DC switching power supply 20, and the negative terminal of the second anti-reverse diode D2 is connected to the input terminal of the electrical load 60 and the EMS controller 40. The third anti-reverse diode...

[0085] The positive terminal of diode D3 is connected to the output terminal of AC / DC switching power supply 30, and the negative terminal of the third anti-reverse diode D3 is connected to the input terminal of electrical load 60 and EMS controller 40.

[0086] In this embodiment, the first anti-reverse diode D1 can be used to prevent the charge output from the battery 5 parts 11 from flowing back into the external DC bus 14 before the EMS controller 40 sends a pop-out command to the one-button start switch QF2 to disconnect the output of the battery internal 11 after the system is under high voltage; the second anti-reverse diode D2 can be used to prevent parallel...

[0087] The AC power from the grid side is converted to DC power by the AC / DC switching power supply 30 and flows back to the DC side of the battery system 10; the third anti-reverse diode D3 can be used to prevent the power of the grid-connected battery system 10 from flowing back to the AC side of the grid after being output by the DC / DC switching power supply 20.

[0088] For example, Figure 1 As shown, a fuse FU is connected in series on the internal DC bus 0 between the battery 11 and the one-button start switch QF2. This fuse can effectively protect the battery system 10 when a short circuit occurs on the internal DC bus 13, thereby further improving the stability and safe operation of the system.

[0089] In addition, such as Figures 2 to 3 As shown, this embodiment also includes a photovoltaic system and a wind turbine system. The photovoltaic system includes a photovoltaic inverter 71 and photovoltaic modules 72, and the photovoltaic modules 72 are connected to the photovoltaic inverter 71 and...

[0090] The system is connected to the AC bus 31; the wind turbine system includes a wind turbine controller 81 and a wind turbine assembly 825, which is connected in parallel to the AC bus 31 through the wind turbine controller 81; at the same time, both the photovoltaic inverter 71 and the wind turbine controller 81 are connected to the EMS controller 40 for control.

[0091] That is, increase the photovoltaic system and the fan system, which can be used for photovoltaic power generation and wind power generation, further improve the overall performance of the energy storage system, and in the case of sufficient sunlight or wind, self-start operation to generate electricity to power the energy storage system 60 and charge the battery system 10. It can also be controlled by the EMS controller 40 to start.

[0092] Please refer to Figures 4 to 5 , the third embodiment of the present application is:

[0093] A one-key starting method of an energy storage system, applied to the energy storage system in the third embodiment, as shown in Figure 4 , comprising the steps of:

[0094] S1, when the system is shut down, press the one-key starting switch, the battery inside the battery system outputs electricity, the internal DC bus is turned on, the DC / DC switching power supply works and outputs electricity, the EMS controller and the power load start to work.

[0095] S2, the EMS controller initializes and identifies that the one-key starting switch is in the pressed state, sends a high voltage command to the high voltage relay of the battery system, controls the coil of the high voltage relay to attract, the external DC bus is turned on, and the high voltage relay feedback attraction signal to the EMS controller.

[0096] S3, after the EMS controller receives the attraction signal, control the one-key starting switch to pop up, the battery power of the battery system is switched from the inside to the outside, and continues to be supplied to the EMS controller and the power load through the DC / DC switching power supply.

[0097] S4, after the system is high voltage, the EMS controller collects and analyzes the voltage amplitude, frequency and phase sequence of the power grid side:

[0098] When the voltage of the power grid side is normal (the amplitude and frequency are within the working range, and the phase sequence is correct), the EMS controller controls the grid-side grid-connected switch to close, the AC bus is turned on, the grid-side electricity is converted to DC through the AC / DC switching power supply to supply power to the EMS controller and the power load, and at the same time, the EMS controller sets the energy storage converter to the grid-connected mode and sends the start command to the energy storage converter. The energy storage converter starts to run, and charges and discharges the battery system according to different power values sent by the EMS controller at different time periods.

[0099] When the voltage of the power grid side is abnormal (the amplitude or frequency is out of the working range, or the phase sequence is wrong), the EMS controller controls the grid-side grid-connected switch to open, the system has no external voltage input, and forms an independent micro-grid, at the same time, the EMS controller sets the energy storage converter to the off-grid mode and sends the start command to the energy storage converter. The energy storage converter starts to run to establish the micro-grid AC bus power supply.

[0100] That is, in the embodiment, based on the same technical concept, a one-key starting method of the energy storage system is provided by cooperating with the above-mentioned energy storage system, a one-key starting switch is arranged on the DC side of the system, when the system is stopped, the one-key starting switch is pressed to first connect the internal DC bus, the energy storage battery cells of the battery system are connected in series, the internal power of the battery is first output through the DC / DC switching power supply to start the EMS controller and the power load, the EMS controller starts to work on the high voltage of the high voltage relay to convert the auxiliary power supply from the internal battery to the system DC bus end, that is, the external output of the battery to continue to maintain the normal work of the EMS controller and the power load, to complete the high voltage process of the system, then according to the voltage condition of the power grid side, the on-off of the grid-connected switch of the system AC side is controlled, and it is selected whether the energy storage converter works in the grid-connected mode or the off-grid mode, and finally the stable operation of the system is realized. The whole process adopts the one-key starting mode to first establish the auxiliary power supply to make each device in the system obtain the working power supply, optimizes the EMS control management strategy, controls the intelligent operation of the subsequent system through the identification and analysis of the current state of the system, realizes that any authorized person can quickly and safely start up the system, and improves the operability of the system.

[0101] The one-key starting process of the energy storage system is specifically as shown in the following table. Figure 5

[0102] Meanwhile, in the embodiment, step S2 is specifically:

[0103] The EMS controller is initialized and recognizes that the one-key starting switch is in the pressed state, then issues a high voltage instruction to the BMS controller;

[0104] The BMS controller receives the high voltage instruction, analyzes the battery state of the battery system, controls the coil of the high voltage relay to be attracted when the battery state of the battery system is normal, completes the high voltage of the system, the external DC bus is turned on, and the attraction signal of the high voltage relay is fed back to the EMS controller.

[0105] In addition, in the embodiment, after step S4, the following step is further included:

[0106] S5, the photovoltaic system and the fan system are self-started to run, and the power generation is supplied to the power load through the AC bus and charges the battery system.

[0107] In summary, the energy storage system and the one-key starting method thereof provided by the application have the following beneficial effects:

[0108] 1. Only one one-key starting switch is needed to realize the fast and safe starting of the system, and the cumbersome system starting operation steps are saved;

[0109] ​2. The starting mode is simple, and professional personnel is not needed to start operation on site, the user can operate by himself, and the cost of professional personnel going to the site is saved;

[0110] 3. One-key starting + direct current power taking, which makes the off-grid black start of the energy storage system more simple and reliable.

[0111] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent transformation, direct or indirect application in the related technical field by using the content of the specification and drawings of the present application is also included in the patent protection range of the present application.

Claims

1. A one-key starting method for an energy storage system, characterized in that, The energy storage system comprises a key start switch, a grid-connected switch, an energy storage converter, a battery system, an AC / DC switch power supply, a DC / DC switch power supply and an EMS controller; The battery system comprises a battery interior, a high-voltage relay and a battery exterior, and the battery interior and the battery exterior are connected to both ends of the coil of the high-voltage relay respectively; Both ends of the grid-connected switch are connected to the grid side and the input end of the AC / DC switch power supply through an AC bus respectively; The AC side of the energy storage converter is connected to the AC bus connected between the grid-connected switch and the input end of the AC / DC switch power supply, and the DC side of the energy storage converter is connected to the input end of the DC / DC switch power supply through an external DC bus; The battery exterior is connected to the external DC bus connected between the energy storage converter and the input end of the DC / DC switch power supply; Both ends of the key start switch are connected to the battery interior and the input end of the DC / DC switch power supply through an internal DC bus respectively; The output end of the AC / DC switch power supply and the output end of the DC / DC switch power supply are connected to a power consumption load and the EMS controller; The EMS controller is in control connection with the key start switch, the energy storage converter, the high-voltage relay and the grid-connected switch; The key start method comprises the following steps: S1, when the system is shut down, the key start switch is pressed, the battery interior of the battery system outputs electric quantity, the internal DC bus is turned on, the DC / DC switch power supply works and outputs electric quantity, and the EMS controller and the power consumption load start to work; S2, after the EMS controller is initialized and identifies that the key start switch is in the pressed state, the EMS controller sends a high-voltage command to the high-voltage relay of the battery system to control the coil of the high-voltage relay to be attracted, the external DC bus is turned on, and the high-voltage relay feeds back an attraction signal to the EMS controller; S3, after the EMS controller receives the attraction signal, the key start switch is controlled to be popped open, the electric quantity of the battery system is switched from the battery interior to the battery exterior to output, and the DC / DC switch power supply continues to supply power to the EMS controller and the power consumption load; S4, after the system is powered up, the EMS controller collects and analyzes the voltage amplitude, frequency and phase sequence of the grid side: When the voltage of the grid side is normal, the grid-connected switch of the EMS controller is controlled to be closed, the AC bus is turned on, the electric quantity of the grid side is converted by the AC / DC switch power supply to output DC to supply power to the EMS controller and the power consumption load, the EMS controller sets the energy storage converter to be in the grid-connected mode, sends a start command to the energy storage converter, the energy storage converter starts to run, and charges and discharges the battery system according to different power values sent by the EMS controller in different time periods. When the grid-side voltage is abnormal, the EMS controller controls the grid-side grid-connected switch to be turned off, the system has no external voltage input, an independent micro-grid is formed, the EMS controller sets the energy storage converter to an off-grid mode, and a start-up instruction is issued to the energy storage converter, the energy storage converter starts to operate, and a micro-grid AC bus power supply is established.

2. A one key start method for an energy storage system as claimed in claim 1, wherein, The battery inside the energy storage system is a cell series terminal; The battery outside the battery is a DC bus terminal.

3. A one key start method for an energy storage system as claimed in claim 1, wherein, The energy storage system further comprises a BMS controller; The BMS controller is electrically connected to the output end of the AC / DC switching power supply and the output end of the DC / DC switching power supply, and is connected to the coil of the high-voltage relay and the EMS controller.

4. A one key start method for an energy storage system as claimed in claim 1, wherein, The one-key start switch of the energy storage system comprises a feedback signal pin and a pop-up control pin; The feedback signal pin and the pop-up control pin are connected to the EMS controller.

5. A one key start method for an energy storage system as claimed in claim 1, wherein, The first anti-reverse diode is further connected in series on the external DC bus between the energy storage converter and the input end of the DC / DC switching power supply, the positive terminal of the first anti-reverse diode is connected to the energy storage converter, and the negative terminal of the first anti-reverse diode is connected to the input end of the DC / DC switching power supply.

6. A one key start method for an energy storage system as claimed in claim 1, wherein, The output end of the DC / DC switching power supply and the output end of the AC / DC switching power supply are connected in parallel to the power load and the input end of the EMS controller through the second anti-reverse diode and the third anti-reverse diode respectively; The positive terminal of the second anti-reverse diode is connected to the output end of the DC / DC switching power supply, the negative terminal of the second anti-reverse diode is connected to the power load and the input end of the EMS controller, the positive terminal of the third anti-reverse diode is connected to the output end of the AC / DC switching power supply, and the negative terminal of the third anti-reverse diode is connected to the power load and the input end of the EMS controller.

7. A one key start method for an energy storage system as claimed in claim 1, wherein, A fuse is further connected in series on the internal DC bus between the battery inside the energy storage system and the one-key start switch.

8. A one key start method of an energy storage system as claimed in claim 1, wherein, The energy storage system further comprises a photovoltaic system; The photovoltaic system comprises a photovoltaic inverter and a photovoltaic assembly, the photovoltaic assembly is connected in parallel to the AC bus through the photovoltaic inverter, and the photovoltaic inverter is connected to the EMS controller. The energy storage system further comprises a fan system; 9. A one key start method for an energy storage system as claimed in claim 1, wherein, The fan system comprises a fan controller and a fan assembly, the fan assembly is connected in parallel to the AC bus through the fan controller, and the fan controller is connected to the EMS controller. The fan controller is connected to the EMS controller. ​

Images