CN112769242A - Energy storage system starting method, device, equipment and system - Google Patents
Energy storage system starting method, device, equipment and system Download PDFInfo
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- CN112769242A CN112769242A CN202011625564.6A CN202011625564A CN112769242A CN 112769242 A CN112769242 A CN 112769242A CN 202011625564 A CN202011625564 A CN 202011625564A CN 112769242 A CN112769242 A CN 112769242A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims abstract description 45
- 238000004590 computer program Methods 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a method, a device, equipment and a system for starting an energy storage system, wherein the method comprises the following steps: acquiring a starting instruction of the energy storage system; wherein, energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor; acquiring the battery state of the flow battery according to the starting instruction, and acquiring the voltage of a power grid; when the battery state meets the preset state and the grid voltage meets the grid-connected condition, disconnecting all the alternating current contactor units and the direct current contactor units; controlling a grid-connected contactor to be closed, wherein the grid-connected contactor is connected with an energy storage system and a power grid; controlling the AC contactor unit to be closed and charging the AC bus capacitor; and sequentially controlling a plurality of direct current contactors in the direct current contactor unit to be sucked so as to charge the flow battery, wherein the direct current contactors are connected in parallel. The application can start to gradually increase the current for charging by using a smaller current, and avoids the impact of a large current on the flow battery.
Description
Technical Field
The present disclosure relates to the field of starting technologies, and in particular, to a method, an apparatus, an electronic device, and a system for starting an energy storage system.
Background
After the flow battery is placed for a long time, the SOC (State of Charge) of the battery is very low, and even the actual Charge amount reaches 0. Currently, the conventional requirement of the energy storage converter system is that the battery voltage is not lower than the peak-to-peak value of the alternating current. If the battery is at low voltage, when the system is started, large current impact is easily formed, impact is formed on the battery and an Insulated Gate Bipolar Transistor (IGBT) freewheeling diode, and damage is caused.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide an energy storage system starting method, an energy storage system starting device, electronic equipment and an energy storage system, and the impact of large current on a flow battery when the energy storage system is started can be avoided. The specific scheme is as follows:
the application discloses an energy storage system starting method, which comprises the following steps:
acquiring a starting instruction of the energy storage system; wherein, the energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
acquiring the battery state of the flow battery according to the starting instruction, and acquiring the voltage of a power grid;
when the battery state meets a preset state and the grid voltage meets a grid-connected condition, disconnecting all the alternating current contactor units and the direct current contactor units;
controlling a grid-connected contactor to be closed, wherein the grid-connected contactor is connected with an energy storage system and a power grid;
controlling the AC contactor unit to be closed and charging the AC bus capacitor;
and sequentially controlling the plurality of direct current contactors in the direct current contactor unit to be sucked, and charging the flow battery, wherein the plurality of direct current contactors are connected in parallel.
Preferably, the ac contactor unit includes ac buffer contactor and ac main contactor, control the actuation of ac contactor unit includes:
controlling the AC buffer contactor to be closed to charge the AC bus capacitor;
when the capacity of the alternating current bus capacitor reaches a preset alternating current capacity threshold value, controlling the alternating current main contactor to be closed;
wherein the alternating current buffer contactor and the alternating current main contactor are connected in parallel.
Preferably, it is a plurality of direct current contactor includes direct current main contactor and a plurality of direct current buffering contactor, and is corresponding, control in proper order a plurality of direct current contactor actuation in the direct current contactor unit includes:
sequentially controlling the plurality of direct current buffer contactors to be sucked to charge the flow battery;
when the SOC value of the flow battery reaches a preset SOC threshold value, controlling the direct-current main contactor to be closed; or after the set time, controlling the direct current main contactor to pull in.
Preferably, it is a plurality of direct current contactor includes direct current main contactor and a plurality of direct current buffering contactor, and is corresponding, control in proper order a plurality of direct current contactor actuation in the direct current contactor unit includes:
sequentially controlling the plurality of direct current buffer contactors to be sucked to charge the flow battery;
when the battery side direct current voltage value of the flow battery reaches a preset battery side direct current voltage threshold value, controlling the direct current main contactor to be attracted; or after the set time, controlling the direct current main contactor to pull in.
Preferably, it is a plurality of to control in proper order the actuation of direct current buffering contactor includes:
and attracting the direct current buffer contactors one by one according to a preset time interval.
Preferably, it is a plurality of to control in proper order the actuation of direct current buffering contactor includes:
and acquiring a direct current voltage value of a real-time battery side, and attracting the direct current buffer contactors one by one according to the direct current voltage value of the real-time battery side.
Preferably, the dc buffer contactor includes a contactor and a dc buffer resistor, and the contactor is connected in series with the dc buffer resistor and connected to other dc buffer contactors in parallel;
it is a plurality of to control in proper order the actuation of direct current buffer contactor, for redox flow battery charges, include:
controlling the direct current buffer contactors to be sequentially attracted according to the resistance value of the direct current buffer resistor;
and if the battery side voltage of the redox flow battery reaches a preset direct current voltage threshold value within the preset time of actuation of the direct current buffer contactor, disconnecting all the alternating current contactor units and the direct current contactor units.
The application provides an energy storage system starting drive includes:
the starting instruction acquisition module is used for acquiring a starting instruction of the energy storage system; wherein, the energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
the acquisition module is used for acquiring the battery state of the flow battery according to the starting instruction and acquiring the voltage of a power grid;
the contactor disconnecting module is used for disconnecting all the alternating current contactor units and the direct current contactor units when the battery state meets a preset state and the power grid voltage meets a grid-connected condition;
the system comprises a grid-connected contactor pull-in module, a grid-connected contactor pull-in module and a grid-connected contactor control module, wherein the grid-connected contactor is connected with an energy storage system and a power grid;
the AC contactor unit actuation module is used for controlling the actuation of the AC contactor unit and charging the AC bus capacitor;
and the direct current contactor unit actuation module is used for sequentially controlling actuation of a plurality of direct current contactors in the direct current contactor unit, and charging the flow battery, wherein the direct current contactors are connected in parallel.
The application provides an electronic device, including:
a memory for storing a computer program;
a processor for implementing the steps of the energy storage system startup method as described above when executing the computer program.
The application provides an energy storage system start-up system, includes:
the electronic device and the energy storage system as described above;
the energy storage system includes: the flow battery, AC contactor unit, direct current contactor unit, AC bus electric capacity, direct current bus electric capacity, wherein, the direct current contactor unit includes a plurality of direct current contactor, and is a plurality of direct current contactor is parallelly connected.
The application discloses an energy storage system starting method, which comprises the following steps: acquiring a starting instruction of the energy storage system; wherein, the energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor; acquiring the battery state of the flow battery according to the starting instruction, and acquiring the voltage of a power grid; when the battery state meets a preset state and the grid voltage meets a grid-connected condition, disconnecting all the alternating current contactor units and the direct current contactor units; controlling a grid-connected contactor to be closed, wherein the grid-connected contactor is connected with an energy storage system and a power grid; controlling the AC contactor unit to be closed and charging the AC bus capacitor; and sequentially controlling the plurality of direct current contactors in the direct current contactor unit to be sucked, and charging the flow battery, wherein the plurality of direct current contactors are connected in parallel.
Therefore, when the energy storage system is started, the battery state of the flow battery is firstly obtained, and when the battery state meets the preset state, the battery is easy to form large-current impact if the battery is started in a conventional mode, the impact is formed on the battery and the IGBT freewheeling diode, and the damage is caused; when grid voltage also accords with the condition of being incorporated into the power networks at this moment, break off all ac contactor units in the energy storage system and dc contactor unit this moment, avoid having the actuation condition to cause the current impact, will incorporate into the power networks the contactor actuation, connect the commercial power, then closed ac contactor unit realizes that ac bus electric capacity charges, cushions for ac bus electric capacity, then, controls in proper order a plurality of dc contactor actuations in the dc contactor unit, for flow battery charges, realizes earlier with less electric current does flow battery charges, and the impact of heavy current to flow battery when avoiding energy storage system to start.
This application still provides an energy storage system starting drive, electronic equipment and system simultaneously, all has above-mentioned beneficial effect, and it is no longer repeated here.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for starting an energy storage system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an energy storage system provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of another energy storage system provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a dc contactor unit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an energy storage system according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an energy storage system starting device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
After the flow battery is placed for a long time, the SOC (State of Charge) of the battery is very low, and even the actual Charge amount reaches 0. Currently, the conventional requirement of the energy storage converter system is that the battery voltage is not lower than the peak-to-peak value of the alternating current. If the battery is low-voltage, when the system is started, large current impact is easily formed, impact is formed on the battery and the IGBT freewheeling diode, and damage is caused. Based on the above technical problem, the embodiment provides an energy storage system starting method, which can avoid impact of a large current on a flow battery when the energy storage system is started. Referring to fig. 1, fig. 1 is a flowchart of a method for starting an energy storage system according to an embodiment of the present application, which specifically includes:
s101, acquiring a starting instruction of the energy storage system; wherein, energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
and receiving a transmitted starting instruction, wherein the starting instruction comprises the identification information and the starting time of the energy storage system. For an energy storage system, the energy storage system comprises: the device comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor. The direct current contactor unit comprises a plurality of direct current contactors, and the direct current contactors are connected in parallel.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an energy storage system provided in an embodiment of the present application, in which the dc contactor unit includes three dc contactors, each of which is a dc buffer contactor, in which the dc buffer contactor includes a contactor and a dc buffer resistor, and the contactor is connected in series with the dc buffer resistor. Referring to fig. 3, fig. 3 is a schematic structural diagram of another energy storage system provided in an embodiment of the present application, in which the dc contactor unit includes three dc contactors, two of which are dc buffer contactors and one of which is a dc main contactor, and the dc main contactor includes only a main contactor.
S102, acquiring a battery state of the flow battery according to a starting instruction, and acquiring a power grid voltage;
the network voltage is a standard voltage of the power supply. The battery state can be the SOC value of the flow battery and also can be the direct-current voltage value of the battery side; the corresponding preset state is sequentially higher than the preset SOC threshold value and higher than the preset voltage threshold value.
S103, when the battery state meets a preset state and the grid voltage meets grid-connected conditions, disconnecting all the alternating current contactor units and all the direct current contactor units;
in one implementation, the battery state and the grid voltage of the flow battery are acquired; if the battery state does not accord with the preset state, starting according to a normal starting mode; and if the battery state meets the preset state, judging whether the power grid voltage meets the grid-connected condition, if so, disconnecting all the alternating current contactor units and the direct current contactor units, and if not, sending prompt information to a user so that the user can adjust the power grid voltage to meet the grid-connected condition.
In another implementable embodiment, the battery state and the grid voltage of the flow battery are acquired simultaneously. Judging whether the battery state meets a preset state or not, judging whether the power grid voltage meets a grid-connected condition or not, and disconnecting all the alternating current contactor units and the direct current contactor units if the power grid voltage meets the preset state and the grid-connected condition; if the preset state is met but the grid-connected condition is not met, sending prompt information to a user so that the user can adjust the grid voltage to meet the grid-connected condition; if the preset state is not met and the grid-connected condition is met, starting in a conventional starting mode; and if the preset state is not met and the grid-connected condition is not met, starting in a conventional starting mode.
S104, controlling a grid-connected contactor to pull in, wherein the grid-connected contactor is connected with an energy storage system and a power grid;
and controlling the grid-connected contactor to pull in, and indicating that the power grid voltage is connected.
And S105, controlling the AC contactor unit to be closed, and charging the AC bus capacitor.
After the AC contactor unit is attracted, the charging of the AC bus capacitor is realized.
In an implementation, the ac contactor unit includes a plurality of ac snubber contactors, and the ac snubber contactors include a contactor and a snubber resistor connected in series with the ac snubber resistors and connected in parallel with other ac snubber contactors. The contactors of the alternating current buffer contactor can be controlled to be closed in sequence; the contactor of the alternating current buffer contactor can be controlled to be closed at the same time, and after the contactor of the alternating current buffer contactor is closed, current flows from the alternating current buffer resistor to the alternating current bus capacitor to charge the alternating current bus capacitor.
In another implementation, the ac snubber contactor unit includes a plurality of ac snubber contactors and an ac main contactor, the ac snubber contactor includes a contactor and an ac snubber resistor, the contactor and the ac snubber resistor are connected in series and connected in parallel with other ac snubber contactors and the ac main contactor, and the ac main contactor does not include the ac snubber resistor. The contactor of the alternating current buffer contactor can be controlled to be closed in sequence, then the contactor of the alternating current main contactor is controlled to be closed, and further, after the contactor of the alternating current main contactor is closed, the contactor of the alternating current buffer contactor can be disconnected; the contactor of the alternating current buffer contactor can be controlled to be closed simultaneously, then the alternating current main contactor is controlled to be closed, and further, after the contactor of the alternating current main contactor is closed, the contactor of the alternating current buffer contactor can be disconnected.
And S106, sequentially controlling a plurality of direct current contactors in the direct current contactor unit to be attracted to charge the flow battery, wherein the direct current contactors are connected in parallel.
The direct current contactor unit comprises a plurality of direct current contactors which are connected in parallel.
When the flow battery is charged, the flow battery is charged by using a small current, and the current is gradually increased, so that the damage caused by overhigh current is avoided.
Based on the technical scheme, when the energy storage system is started, the battery state of the flow battery is firstly obtained, and when the battery state meets the preset state, the battery state indicates that if the battery is started in a conventional mode, large current impact is easily formed, and the battery and the IGBT freewheeling diode are impacted to cause damage; when grid voltage also accords with the condition of being incorporated into the power networks at this moment, break off all ac contactor units in the energy storage system and dc contactor unit this moment, avoid having the actuation condition to cause the current impact, will incorporate into the power networks the contactor actuation, connect the commercial power, then closed ac contactor unit realizes that ac bus electric capacity charges, cushions for ac bus electric capacity, then, controls in proper order a plurality of dc contactor actuations in the dc contactor unit, for flow battery charges, realizes earlier with less electric current does flow battery charges, and the impact of heavy current to flow battery when avoiding energy storage system to start.
Further, the ac contactor unit includes ac buffer contactor and ac main contactor, and control ac contactor unit actuation includes: controlling the AC buffer contactor to be closed to charge the AC bus capacitor; when the capacity of the alternating current bus capacitor reaches a preset alternating current capacity threshold value, controlling an alternating current main contactor to be closed; the alternating current buffer contactor and the alternating current main contactor are connected in parallel.
The alternating current buffer contactor comprises a contactor and an alternating current buffer resistor, and the alternating current main contactor only comprises the contactor.
Referring to fig. 2, it can be seen that when the capacity of the ac bus capacitor reaches the preset ac capacity threshold, it indicates that the charging of the ac capacitor bus capacitor reaches the preset ac capacity threshold, and the contactor 2 of the ac main contactor is controlled to close. The alternating current buffer contactor is closed firstly, current flows to the alternating current bus capacitor from the alternating current buffer resistor, small current is used for charging the alternating current bus capacitor, then when the capacity of the alternating current bus capacitor reaches a preset alternating current capacity threshold value, the alternating current main contactor is closed, the short circuit and the alternating current buffer resistor of the alternating current buffer contactor are short-circuited, and the current is gradually increased to avoid damage caused by overhigh current.
Further, a plurality of direct current contactor include direct current main contactor and a plurality of direct current buffering contactor, and what correspond controls a plurality of direct current contactor actuation in the direct current contactor unit in proper order, include: sequentially controlling a plurality of direct current buffer contactors to be sucked for charging the flow battery; when the SOC value of the flow battery reaches a preset SOC threshold value, controlling the direct-current main contactor to be closed; or after the set time, controlling the direct current main contactor to pull in.
The number of the direct current buffer contactors is not limited in the embodiment, and a user can set the direct current buffer contactors in a user-defined mode. Referring to fig. 4, fig. 4 is a schematic structural diagram of a dc contactor unit according to an embodiment of the present disclosure.
The direct current buffer contactor comprises a contactor and a direct current buffer resistor, and the contactor is connected with the direct current buffer resistor in series; the dc main contactor includes only contactors.
Contactor actuation among the direct current buffering contactor is controlled in proper order, and total resistance value in the circuit reduces gradually this moment, and the direct current buffering resistance flow direction flow to the redox flow battery among the direct current buffering contactor is passed through to the electric current to when this electric current charges for the redox flow battery, adopt the undercurrent to charge to the redox flow battery earlier, then along with the contactor closure among the direct current buffering contactor, the increase of current can charge fast, has avoided the damage to the redox flow battery that directly adopts heavy current charging to cause.
When the SOC value of the flow battery reaches a preset SOC threshold value, the direct-current main contactor is controlled to be closed, and the flow battery cannot be damaged by adopting large current charging; or after the set time, controlling the direct current main contactor to pull in, wherein the set time is set by a technician according to the actual condition, and after the set time, controlling the direct current main contactor to pull in does not cause the impact of the large current on the flow battery.
Further, a plurality of direct current contactor include direct current main contactor and a plurality of direct current buffering contactor, and what correspond controls a plurality of direct current contactor actuation in the direct current contactor unit in proper order, include: sequentially controlling a plurality of direct current buffer contactors to be sucked for charging the flow battery; when the direct-current voltage value of the battery side of the flow battery reaches a preset battery side direct-current voltage threshold value, controlling a direct-current main contactor to pull in; or after the set time, controlling the direct current main contactor to pull in.
The direct current buffer contactor comprises a contactor and a direct current buffer resistor, and the contactor is connected with the direct current buffer resistor in series; the dc main contactor includes only contactors. And when the direct current voltage value of the battery side of the flow battery reaches a preset battery side direct current voltage threshold value, or after the set time, controlling the direct current main contactor to pull in. And large current is adopted for charging, so that the impact of the initial large current on the flow battery is avoided, and the damage of the battery is avoided.
Further, control a plurality of direct current buffering contactors actuation in proper order, include: and attracting the plurality of direct current buffer contactors one by one according to a preset time interval.
The pull-in of the direct current buffer contactor is controlled one by one at preset time intervals, so that the gradual increase of current is ensured, and the increase of the current is more stable.
Further, control a plurality of direct current buffering contactors actuation in proper order, include:
and acquiring a direct current voltage value of the real-time battery side, and attracting the plurality of direct current buffer contactors one by one according to the direct current voltage value of the real-time battery side.
The method comprises the steps of setting a plurality of set battery side direct current voltage values, controlling a first direct current buffer contactor to be closed, then controlling a second direct current buffer contactor to be closed when the real-time battery side direct current voltage value reaches the first set battery side direct current voltage value, controlling a third direct current buffer contactor to be closed when the real-time battery side direct current voltage value reaches the second set battery side direct current voltage value, and the like.
Further, the direct current buffer contactor comprises a contactor and a direct current buffer resistor, wherein the contactor and the direct current buffer resistor are connected in series and are connected with other direct current buffer contactors in a parallel connection mode; control a plurality of direct current buffer contactor actuation in proper order, for redox flow battery charging, include: controlling a plurality of direct current buffer contactors to be sequentially attracted according to the resistance value of the direct current buffer resistor; and if the battery side voltage of the redox flow battery reaches a preset direct current voltage threshold value within the preset time of the pull-in of the direct current buffer contactor, disconnecting all the alternating current contactor units and the direct current contactor units.
And current flows to the flow battery through a direct current buffer resistor in the direct current buffer contactor, and the current is used for charging the flow battery. In this embodiment, the direct current buffer contactors are controlled to be sequentially attracted according to the resistance value or the type of the direct current buffer resistor, and when it is detected that the battery side voltage of the flow battery reaches a preset direct current voltage threshold value within a preset time of attraction of a target direct current buffer contactor, all the alternating current contactor units and all the direct current contactor units are disconnected so as to avoid overload burning of the direct current buffer resistor.
Based on any of the above embodiments, this embodiment provides a specific energy storage system starting method, including:
s1, starting the energy storage system, please refer to fig. 5, and fig. 5 is a schematic structural diagram of an energy storage system according to an embodiment of the present disclosure, where the energy storage system is started to supply power to an electronic device implementing the method for starting the energy storage system with an auxiliary voltage of 220V.
S2, confirming the battery state of the flow battery, for example, the SOC value of the flow battery is lower than a preset SOC threshold value;
s3, detecting whether the grid voltage meets grid-connection conditions; if the grid-connected condition is met, executing S4;
s4, detecting whether all contactors are disconnected, if not, controlling to disconnect all contactors, and if so, executing a step S5;
s5, controlling the grid-connected and off-grid contactor to suck, wherein the grid-connected and off-grid contactor is a system external contactor and is used for connecting a power grid;
s6, controlling the AC buffer contactor to pull in for buffering the AC bus capacitor;
s7, judging that the effective value of the alternating-current bus voltage is higher than 70% of rated grid-connected voltage;
s8, when the requirement of S7 is met, the AC main contactor is closed, and at the moment, the AC buffer contactor can be disconnected;
s9, delaying for 1S after S8, and after the direct current bus is buffered, performing direct current primary buffer suction;
s10, delaying for 2S after S9, and carrying out direct-current secondary buffer pull-in;
and S11, delaying for 2S after S10, closing the direct current main contactor, and disconnecting the direct current first-stage buffer contactor and the direct current second-stage buffer contactor to finish the starting of the energy storage system.
The direct current first-stage and second-stage buffer contactors are in step-by-step pull-in, when a battery is charged, a small current is used for charging, the current is increased step by step, the off-grid contactor is a contactor outside an energy storage system product, one end of the contactor is connected with a power grid, and the other end of the contactor is connected with an alternating current end of the energy storage system. The dc bus and ac bus buffer, which actually charges the capacitor on the bus, is not shown.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an energy storage system starting device provided in an embodiment of the present application, where the energy storage system starting device provided in the embodiment of the present application and the energy storage system starting method provided in the above description are referred to in correspondence, and includes:
a starting instruction obtaining module 501, configured to obtain a starting instruction of the energy storage system; wherein, energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
the obtaining module 502 is configured to obtain a battery state of the flow battery according to the starting instruction, and obtain a power grid voltage;
a contactor disconnecting module 503, configured to disconnect all the ac contactor units and the dc contactor units when the battery state meets a preset state and the grid voltage meets a grid connection condition;
a grid-connected contactor pull-in module 504, configured to control pull-in of a grid-connected contactor, where the grid-connected contactor is connected to the energy storage system and the power grid;
an ac contactor unit actuation module 505 for controlling actuation of the ac contactor unit to charge the ac bus capacitor;
the dc contactor unit pull-in module 506 sequentially controls a plurality of dc contactors in the dc contactor unit to pull in for charging the flow battery, wherein the plurality of dc contactors are connected in parallel.
Preferably, the ac contactor unit includes an ac buffer contactor and an ac main contactor, and the ac contactor unit actuation module 505 includes:
the AC buffer contactor actuation unit is used for controlling the actuation of the AC buffer contactor and charging the AC bus capacitor;
the AC main contactor pull-in unit is used for controlling the AC main contactor to pull in when the capacity of the AC bus capacitor reaches a preset AC capacity threshold value;
the alternating current buffer contactor and the alternating current main contactor are connected in parallel.
Preferably, the plurality of dc contactors include a dc main contactor and a plurality of dc buffer contactors, and the dc contactor unit pull-in module 506 includes:
the direct current buffer contactor actuation unit is used for sequentially controlling actuation of a plurality of direct current buffer contactors to charge the flow battery;
the first direct current main contactor pull-in unit is used for controlling the direct current main contactor to pull in when the SOC value of the redox flow battery reaches a preset SOC threshold value; or after the set time, controlling the direct current main contactor to pull in.
Preferably, the plurality of dc contactors include a dc main contactor and a plurality of dc buffer contactors, and the dc contactor unit pull-in module 506 includes:
the direct current buffer contactor actuation unit is used for sequentially controlling actuation of a plurality of direct current buffer contactors to charge the flow battery;
the second direct current main contactor pull-in unit is used for controlling the direct current main contactor to pull in when the direct current voltage value of the battery side of the flow battery reaches a preset battery side direct current voltage threshold value; or after the set time, controlling the direct current main contactor to pull in.
Preferably, the dc buffer contactor pull-in unit includes:
and the first direct current buffer contactor pull-in sub-unit is used for pulling in the plurality of direct current buffer contactors one by one according to a preset time interval.
Preferably, the dc buffer contactor pull-in unit includes:
and the second direct current buffer contactor actuation subunit is used for acquiring the direct current voltage value of the real-time battery side and actuating a plurality of direct current buffer contactors one by one according to the direct current voltage value of the real-time battery side.
Preferably, the direct current buffer contactor comprises a contactor and a direct current buffer resistor, wherein the contactor and the direct current buffer resistor are connected in series and are connected with other direct current buffer contactors in a parallel connection mode;
direct current buffering contactor actuation unit includes:
the third direct current buffer contactor suction sub-unit is used for controlling the plurality of direct current buffer contactors to be sucked in sequence according to the resistance value of the direct current buffer resistor;
and the disconnection subunit is used for disconnecting all the alternating current contactor units and the direct current contactor units if the battery side voltage of the redox flow battery reaches a preset direct current voltage threshold value within the preset time of the pull-in of the direct current buffer contactor.
Since the embodiments of the apparatus portion and the method portion correspond to each other, please refer to the description of the embodiments of the method portion for the embodiments of the apparatus portion, which is not repeated here.
In the following, an electronic device provided by an embodiment of the present application is introduced, and the electronic device described below and the energy storage system starting method described above may be referred to correspondingly.
The present embodiment provides an electronic device, including:
a memory for storing a computer program;
and the processor is used for realizing the steps of the energy storage system starting method when executing the computer program.
Since the embodiment of the electronic device portion corresponds to the embodiment of the energy storage system starting method portion, please refer to the description of the embodiment of the energy storage system starting method portion for the embodiment of the electronic device portion, which is not repeated here.
In the following, an energy storage system starting system provided by an embodiment of the present application is introduced, and the energy storage system starting system described below and the energy storage system starting method described above may be referred to correspondingly.
The present embodiment provides an energy storage system starting system, including:
the electronic device and the energy storage system as described above;
the energy storage system includes: the flow battery, AC contactor unit, direct current contactor unit, AC bus electric capacity, direct current bus electric capacity, wherein, direct current contactor unit includes a plurality of direct current contactor, and a plurality of direct current contactor are parallelly connected.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above detailed description is provided for an energy storage system starting method, an energy storage system starting device, an electronic device, a computer-readable storage medium, and a computer-readable storage system. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. An energy storage system starting method, comprising:
acquiring a starting instruction of the energy storage system; wherein, the energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
acquiring the battery state of the flow battery according to the starting instruction, and acquiring the voltage of a power grid;
when the battery state meets a preset state and the grid voltage meets a grid-connected condition, disconnecting all the alternating current contactor units and the direct current contactor units;
controlling a grid-connected contactor to be closed, wherein the grid-connected contactor is connected with an energy storage system and a power grid;
controlling the AC contactor unit to be closed and charging the AC bus capacitor;
and sequentially controlling the plurality of direct current contactors in the direct current contactor unit to be sucked, and charging the flow battery, wherein the plurality of direct current contactors are connected in parallel.
2. The energy storage system starting method according to claim 1, wherein the ac contactor unit comprises an ac buffer contactor and an ac main contactor, and the controlling the ac contactor unit to be closed comprises:
controlling the AC buffer contactor to be closed to charge the AC bus capacitor;
when the capacity of the alternating current bus capacitor reaches a preset alternating current capacity threshold value, controlling the alternating current main contactor to be closed;
wherein the alternating current buffer contactor and the alternating current main contactor are connected in parallel.
3. The energy storage system starting method according to claim 1, wherein the plurality of dc contactors include a dc main contactor and a plurality of dc buffer contactors, and correspondingly, the sequentially controlling the plurality of dc contactors in the dc contactor unit to be closed includes:
sequentially controlling the plurality of direct current buffer contactors to be sucked to charge the flow battery;
when the SOC value of the flow battery reaches a preset SOC threshold value, controlling the direct-current main contactor to be closed; or after the set time, controlling the direct current main contactor to pull in.
4. The energy storage system starting method according to claim 1, wherein the plurality of dc contactors include a dc main contactor and a plurality of dc buffer contactors, and correspondingly, the sequentially controlling the plurality of dc contactors in the dc contactor unit to be closed includes:
sequentially controlling the plurality of direct current buffer contactors to be sucked to charge the flow battery;
when the battery side direct current voltage value of the flow battery reaches a preset battery side direct current voltage threshold value, controlling the direct current main contactor to be attracted; or after the set time, controlling the direct current main contactor to pull in.
5. The energy storage system starting method according to claim 3 or 4, wherein the sequentially controlling the plurality of direct current buffer contactors to be closed comprises:
and attracting the direct current buffer contactors one by one according to a preset time interval.
6. The energy storage system starting method according to claim 3 or 4, wherein the sequentially controlling the plurality of direct current buffer contactors to be closed comprises:
and acquiring a direct current voltage value of a real-time battery side, and attracting the direct current buffer contactors one by one according to the direct current voltage value of the real-time battery side.
7. The energy storage system starting method according to claim 3 or 4, wherein the direct current buffer contactor comprises a contactor and a direct current buffer resistor, and the contactor and the direct current buffer resistor are connected in series and are connected with other direct current buffer contactors in parallel;
it is a plurality of to control in proper order the actuation of direct current buffer contactor, for redox flow battery charges, include:
controlling the direct current buffer contactors to be sequentially attracted according to the resistance value of the direct current buffer resistor;
and if the battery side voltage of the redox flow battery reaches a preset direct current voltage threshold value within the preset time of actuation of the direct current buffer contactor, disconnecting all the alternating current contactor units and the direct current contactor units.
8. An energy storage system starting device, comprising:
the starting instruction acquisition module is used for acquiring a starting instruction of the energy storage system; wherein, the energy storage system includes: the system comprises a flow battery, an alternating current contactor unit, a direct current contactor unit, an alternating current bus capacitor and a direct current bus capacitor;
the acquisition module is used for acquiring the battery state of the flow battery according to the starting instruction and acquiring the voltage of a power grid;
the contactor disconnecting module is used for disconnecting all the alternating current contactor units and the direct current contactor units when the battery state meets a preset state and the power grid voltage meets a grid-connected condition;
the system comprises a grid-connected contactor pull-in module, a grid-connected contactor pull-in module and a grid-connected contactor control module, wherein the grid-connected contactor is connected with an energy storage system and a power grid;
the AC contactor unit actuation module is used for controlling the actuation of the AC contactor unit and charging the AC bus capacitor;
and the direct current contactor unit actuation module is used for sequentially controlling actuation of a plurality of direct current contactors in the direct current contactor unit, and charging the flow battery, wherein the direct current contactors are connected in parallel.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the energy storage system startup method according to any one of claims 1 to 7 when executing the computer program.
10. An energy storage system starting system, comprising:
the electronic device and the energy storage system of claim 9;
the energy storage system includes: the flow battery, AC contactor unit, direct current contactor unit, AC bus electric capacity, direct current bus electric capacity, wherein, the direct current contactor unit includes a plurality of direct current contactor, and is a plurality of direct current contactor is parallelly connected.
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| CN202011625564.6A CN112769242B (en) | 2020-12-30 | 2020-12-30 | Energy storage system starting method, device, equipment and system |
| PCT/CN2021/140332 WO2022143324A1 (en) | 2020-12-30 | 2021-12-22 | Method and apparatus for starting energy storage system, and electronic device and system |
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| CN202011625564.6A CN112769242B (en) | 2020-12-30 | 2020-12-30 | Energy storage system starting method, device, equipment and system |
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| CN114156999A (en) * | 2021-10-29 | 2022-03-08 | 科华数据股份有限公司 | Battery charging and discharging circuit slow starting method and device and battery charging and discharging system |
| WO2022143324A1 (en) * | 2020-12-30 | 2022-07-07 | 漳州科华技术有限责任公司 | Method and apparatus for starting energy storage system, and electronic device and system |
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| WO2022143324A1 (en) | 2022-07-07 |
| CN112769242B (en) | 2022-12-06 |
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