CN114825286A - Method and system for quickly cutting off direct-current power distribution network - Google Patents
Method and system for quickly cutting off direct-current power distribution network Download PDFInfo
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- CN114825286A CN114825286A CN202210304616.2A CN202210304616A CN114825286A CN 114825286 A CN114825286 A CN 114825286A CN 202210304616 A CN202210304616 A CN 202210304616A CN 114825286 A CN114825286 A CN 114825286A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a method for quickly cutting off a direct-current power distribution network, which is characterized in that the direct-current power distribution network and an alternating-current power network carry out alternating-current and direct-current conversion through a tide current controller, and a distributed power supply, a high-capacity energy storage battery and a load are connected into a direct-current bus, and the method comprises the following steps: detecting a fault current signal of the direct-current power distribution network based on the power flow controller; controlling a high-capacity energy storage battery to be directly connected with a direct-current power distribution network according to the fault current signal, and turning off a power flow controller; and identifying and cutting off a fault load branch corresponding to the fault current signal, and supplying power to the off-grid operation through a high-capacity energy storage battery to enable the fault current transient characteristic of the fault load branch to meet the action condition of the direct current circuit breaker. The high-capacity energy storage battery is used for supplying power to the off-grid operation, a low-voltage direct-current protection device does not need to be configured, so that the fault current transient characteristic of a direct-current fault position meets the action condition of a direct-current breaker, and the purpose of quickly removing the fault is achieved.
Description
Technical Field
The invention relates to the technical field of power distribution network fault protection, in particular to a method and a system for quickly cutting off a direct-current power distribution network.
Background
With the development of the direct current power supply technology, particularly the development of the power semiconductor technology, the direct current power supply technology and the direct current electric appliance product overcome the original defects and obtain technical and economic advantages again in some fields at the end of the 20 th century. In addition, along with the needs of energy conservation and emission reduction and comprehensive utilization of energy in various countries, the distributed energy system is more and more emphasized due to the characteristics of flexible variable load, lower initial investment, reliable power supply, smaller power transmission loss, suitability for renewable energy application and the like. The popularization of the distributed power supply can greatly promote the development of the direct current power distribution network, and the most fundamental reason is that the distributed power supply is combined with the direct current power distribution network, so that a large number of converter devices can be saved. Therefore, compared with an alternating current power distribution network, the direct current power distribution network has remarkable technical and economic advantages in the aspects of improving power supply radius and capacity, reducing line cost, facilitating distributed power access, improving system efficiency and the like.
When the direct-current power distribution network is in an operating state, if a short-circuit fault occurs at a certain position, the direct-current power distribution network has the characteristics of small direct-current fault damping, large fault current, high rising speed and the like. And harsh requirements are put on the rapidity of protection of the direct current system, the breaking capacity of the direct current breaker and the action time. However, the application of the large-capacity dc circuit breaker is not mature at present because the dc fault current has no zero crossing point to cause arc quenching difficulty. Moreover, because the damping of the direct current system is small, the rising speed of the fault current is fast after the direct current fault occurs, and the fault current generally rises to an overcurrent peak value within a few milliseconds, which puts a high requirement on the action speed of the protection scheme. If the direct current breaker can not act quickly to remove faults, the three-phase short circuit on the alternating current side or the overcurrent of the freewheeling diode can be caused seriously. When the power flow controller monitors fault current, the circuit breaker can be tripped, the alternating current power grid is cut off to supply power to the direct current power distribution network, and then the direct current power distribution network system is started up in a black mode, and impact and damage are caused to the whole direct current power distribution network system.
In order to solve the problems, a low-voltage direct-current bus protection device and a low-voltage line protection device are configured in a direct-current power distribution network system to ensure quick fault removal. The configuration of the low-voltage direct-current protection device can ensure the stable operation of a direct-current power distribution network system to a certain extent, but has the problems of high construction cost, complex communication and the like, and is not beneficial to the popularization and application of the direct-current power distribution network.
Disclosure of Invention
The invention aims to provide a method and a system for rapidly cutting off a direct-current power distribution network.
In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides a method for quickly cutting off a dc power distribution network, where the dc power distribution network and an ac power network perform ac-dc conversion through a tidal current controller, and a distributed power supply, a large-capacity energy storage battery, and a load are connected to a dc bus, including the following steps:
detecting a fault current signal of the direct current power distribution network based on the power flow controller;
according to the fault current signal, controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network, and turning off the power flow controller;
and identifying and cutting off a fault load branch circuit corresponding to the fault current signal, and enabling the fault current transient characteristic of the fault load branch circuit to meet the action condition of the direct current breaker by the power supply and off-grid operation of the high-capacity energy storage battery.
Further, the controlling the high-capacity energy storage battery to be directly connected with the dc power distribution network and turning off the power flow controller includes:
sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal, and closing the direct-connected breaker;
sending a switching-off signal to an inter-connection breaker of the power flow controller breaker and the high-capacity energy storage battery, and disconnecting the power flow controller breaker and the inter-connection breaker;
the high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
Further, after the load branch corresponding to the fault is identified and cut, the method further includes:
receiving a feedback signal of the disconnection state of the direct current breaker of the load branch circuit;
closing an inter-connection breaker of the power flow controller and the high-capacity energy storage battery;
and disconnecting the direct-connected breaker of the high-capacity energy storage battery.
Further, the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct current distribution network system.
Accordingly, a second aspect of the embodiments of the present invention provides a system for quickly removing a dc power distribution network, where the dc power distribution network and an ac power network perform ac/dc conversion through a tidal current controller, and a distributed power source, a large-capacity energy storage battery, and a load are connected to a dc bus, including:
the fault detection module is used for detecting a fault current signal of the direct current distribution network based on the power flow controller;
the fault control module is used for controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network according to the fault current signal and switching off the power flow controller;
the fault control module is also used for identifying and cutting off a fault load branch circuit corresponding to the fault current signal, and the fault current transient characteristic of the fault load branch circuit meets the action condition of the direct current circuit breaker through the off-grid operation of the high-capacity energy storage battery.
Further, the fault control module includes:
the first control unit is used for sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal and closing the direct-connected breaker;
the second control unit is used for sending a brake-separating signal to an inter-connection breaker of the power flow controller breaker and the high-capacity energy storage battery and disconnecting the power flow controller breaker and the inter-connection breaker;
the high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
Further, the quick cutting system of direct current distribution network still includes: a fault recovery module, comprising:
the signal receiving unit is used for receiving a feedback signal of the disconnection state of the direct current breaker of the load branch circuit;
a third control unit for closing an indirect circuit breaker of the power flow controller and the high-capacity energy storage battery;
a fourth control unit for disconnecting a direct connection breaker of the high capacity energy storage battery.
Furthermore, the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct current power distribution network system.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor, the instructions being executable by the one processor to cause the at least one processor to perform any of the above dc power distribution network fast cut-off methods.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement any of the above-mentioned methods for fast cutting off a dc power distribution network.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the high-capacity energy storage battery is used for supplying power to the off-grid operation, a low-voltage direct-current protection device does not need to be configured, so that the fault current transient characteristic of a direct-current fault position meets the action condition of a direct-current breaker, and the purpose of quickly removing the fault is achieved.
Drawings
Fig. 1 is a structural diagram of a dc distribution network system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for rapidly cutting off a dc power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an off-grid operating state of a dc distribution network according to an embodiment of the present invention;
fig. 4 is a schematic diagram of the system after the fault of the dc distribution network is removed according to the embodiment of the present invention;
fig. 5 is a block diagram of a dc distribution network rapid removal system provided in an embodiment of the present invention;
FIG. 6 is a block diagram of a fault control module provided by an embodiment of the present invention;
fig. 7 is a block diagram of a fault recovery module according to an embodiment of the present invention.
Reference numerals:
1. the device comprises a fault detection module 2, a fault control module 21, a first control unit 22, a second control unit 3, a fault recovery module 31, a signal receiving unit 32, a third control unit 33 and a fourth control unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1, 2, 3, and 4, a first aspect of an embodiment of the present invention provides a method for quickly cutting off a dc power distribution network, where the dc power distribution network and an ac power network perform ac-dc conversion through a tidal current controller, and a distributed power source, a large-capacity energy storage battery, and a load are connected to a dc bus, including the following steps:
and S100, detecting a fault current signal of the direct current distribution network based on the power flow controller.
And S200, controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network according to the fault current signal, and turning off the power flow controller.
And step S300, identifying and cutting off a fault load branch corresponding to the fault current signal, and enabling the fault current transient characteristics of the fault load branch to meet the action conditions of the direct current breaker by supplying power to the off-grid operation through a high-capacity energy storage battery.
Further, step S200, controlling the high-capacity energy storage battery to be directly connected to the dc power distribution network and turning off the power flow controller includes:
and step S210, sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal, and closing the direct-connected breaker.
And step S220, a brake separating signal is sent to the inter-connection breaker of the power flow controller breaker and the high-capacity energy storage battery, and the power flow controller breaker and the inter-connection breaker are disconnected.
The high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
Further, after the load branch corresponding to the fault is identified and removed in step S300, the method further includes:
and step S410, receiving a feedback signal of the disconnection state of the direct current breaker of the load branch circuit.
And step S420, closing the inter-connection breaker of the power flow controller and the large-capacity energy storage battery.
And step S430, disconnecting the direct-connected breaker of the high-capacity energy storage battery.
Further, the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct-current power distribution network system. Preferably, the capacity of the large-capacity energy storage battery is 2 times of the load of the direct current power distribution network system.
Under normal conditions, the direct-current power distribution network is connected with the alternating-current power grid through the power flow controller and operates in a grid-connected mode, and power exchange is carried out between the direct-current power distribution network and the alternating-current power grid; when the direct-current power distribution network is detected to have a short-circuit fault, the power flow controller sends fault information to the monitoring system, the monitoring system sends an opening and closing instruction, the grid-connected state is switched to the off-grid state, and the energy storage battery supplies power to the direct-current power distribution network system. The off-grid operating state diagram is shown in fig. 3.
When a direct-current short-circuit fault occurs In the direct-current distribution network system, the fault current can reach a peak value within 5-10ms, 40ms approaches to 1.5In, and the peak current can reach 15 In. The short-circuit protection range of the direct-current circuit breaker is 5-10 In, the time is 100ms, and therefore the fault cannot be timely removed. As a result, the power flow controller detects a fault current to trip the circuit breaker, and cuts off the power supply from the ac power grid to the dc power distribution grid, causing a black start of the dc power distribution grid system, and causing impact and damage to the entire dc power distribution grid system. Meanwhile, great difficulty is brought to fault location and removal.
The method aims at the problems that the direct current fault damping is small, the fault current is large, the fault current rising speed is high, the breaking capacity and the action time of a direct current breaker cannot be met, the fault cannot be removed rapidly and the like in a grid-connected state. The off-grid operation of the high-capacity energy storage system is selected, so that the transient characteristic of the direct current fault current can meet the action condition of the direct current breaker, and the rapid removal of the fault is ensured.
And when the direct current fault is removed, the monitoring system sends a switching-on/off command and switches from the off-grid state to the on-grid state. The operation diagram of the system after fault removal is shown in figure 4.
In a specific implementation manner of the embodiment of the present invention, the steps are as follows:
1) the power flow controller finds a fault by monitoring fault current and sends the fault to a monitoring system;
2) the monitoring system sends a remote close command to close circuit breaker B2.
3) The monitoring system sends a remote control opening command to open the circuit breakers B1 and B4.
The breaker B2 is a direct-connection breaker of a high-capacity energy storage battery, the breaker B1 is a power flow controller breaker, and the breaker B4 is an indirect breaker of the high-capacity energy storage battery.
The off-grid operating state diagram is shown in fig. 3.
In an off-grid state, the dc breaker B5 recognizes the fault and opens;
1) the monitoring system receives feedback of the disconnection state of the direct current breaker B5;
2) the monitoring system sends a remote control closing command to close the circuit breakers B1 and B4;
3) the monitoring system sends a remote control opening command to open the breaker B2;
4) and after the fault is removed, the monitoring system restores the grid-connected state from the off-grid state through switching-on and switching-off operation. As shown in fig. 4.
The breaker B5 is a dc breaker in a fault load branch.
Accordingly, referring to fig. 5, a second aspect of the embodiments of the present invention provides a system for quickly cutting off a dc power distribution network, where the dc power distribution network and an ac power network perform ac-dc conversion through a tidal current controller, and a distributed power source, a large-capacity energy storage battery, and a load are connected to a dc bus, including:
and the fault detection module 1 is used for detecting a fault current signal of the direct current distribution network based on the power flow controller.
And the fault control module 2 is used for controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network according to the fault current signal and switching off the power flow controller.
The fault control module 2 is also used for identifying and cutting off a fault load branch circuit corresponding to the fault current signal, and the fault load branch circuit is powered by a high-capacity energy storage battery to run off the grid, so that the fault current transient characteristic of the fault load branch circuit meets the action condition of the direct current circuit breaker.
Further, referring to fig. 6, the fault control module 2 includes:
the first control unit 21 is used for sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal and closing the direct-connected breaker;
the second control unit 22 is used for sending a brake-separating signal to the inter-connection circuit breaker of the power flow controller circuit breaker and the high-capacity energy storage battery and disconnecting the power flow controller circuit breaker and the inter-connection circuit breaker;
the high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
Further, referring to fig. 7, the dc distribution network fast cutting system further includes: a failure recovery module 3, comprising:
a signal receiving unit 31 for receiving a dc breaker open state feedback signal of the load branch;
a third control unit 32 for closing an indirect circuit breaker of the power flow controller and the large-capacity energy storage battery;
a fourth control unit 33 for disconnecting a direct-connected breaker of the high capacity energy storage battery.
Further, the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct-current power distribution network system.
Accordingly, a third aspect of an embodiment of the present invention provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by a processor, and the instructions are executed by the processor to cause at least one processor to execute any one of the above methods for fast cutting off a dc distribution network.
Accordingly, a fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which computer instructions are stored, and the computer instructions, when executed by a processor, implement any of the above-mentioned methods for fast cutting off a dc power distribution network.
The embodiment of the invention aims to protect a method and a system for quickly cutting off a direct-current power distribution network, and has the following effects:
the high-capacity energy storage battery is used for supplying power to the off-grid operation, a low-voltage direct-current protection device does not need to be configured, so that the fault current transient characteristic of a direct-current fault position meets the action condition of a direct-current breaker, and the purpose of quickly removing the fault is achieved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method for quickly cutting off a direct-current power distribution network is characterized in that the direct-current power distribution network and an alternating-current power distribution network are subjected to alternating-current and direct-current conversion through a tide current controller, a distributed power supply, a high-capacity energy storage battery and a load are connected to a direct-current bus, and the method comprises the following steps:
detecting a fault current signal of the direct current distribution network based on the power flow controller;
according to the fault current signal, controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network, and turning off the power flow controller;
and identifying and cutting off a fault load branch circuit corresponding to the fault current signal, and enabling the fault current transient characteristic of the fault load branch circuit to meet the action condition of the direct current breaker by the power supply and off-grid operation of the high-capacity energy storage battery.
2. The method for rapidly cutting off the direct current distribution network according to claim 1, wherein the controlling the high-capacity energy storage battery to be directly connected with the direct current distribution network and turning off the power flow controller comprises:
sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal, and closing the direct-connected breaker;
sending a brake-separating signal to an inter-connection breaker of the power flow controller breaker and the high-capacity energy storage battery, and disconnecting the inter-connection breaker at night;
the high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
3. The method for rapidly cutting off the direct current distribution network according to claim 2, wherein after the load branch corresponding to the fault is identified and cut off, the method further comprises the following steps:
receiving a feedback signal of the disconnection state of the direct current breaker of the load branch circuit;
closing an inter-connection breaker of the power flow controller and the high-capacity energy storage battery;
and disconnecting the direct-connected breaker of the high-capacity energy storage battery.
4. The method for rapidly cutting off the direct current distribution network according to any one of claims 1 to 3,
and the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct current power distribution network system.
5. The utility model provides a quick excision system of direct current distribution network, its characterized in that, direct current distribution network carries out alternating current-direct current conversion through the tide current controller with the alternating current net, and distributed generator, large capacity energy storage battery and load access direct current generating line include:
the fault detection module is used for detecting a fault current signal of the direct current distribution network based on the power flow controller;
the fault control module is used for controlling the high-capacity energy storage battery to be directly connected with the direct-current power distribution network according to the fault current signal and switching off the power flow controller;
the fault control module is also used for identifying and cutting off a fault load branch circuit corresponding to the fault current signal, and the fault current transient characteristic of the fault load branch circuit meets the action condition of the direct current circuit breaker through the off-grid operation of the high-capacity energy storage battery.
6. The system of claim 5, wherein the fault control module comprises:
the first control unit is used for sending a remote control closing signal to a direct-connected breaker of the high-capacity energy storage battery according to the fault current signal and closing the direct-connected breaker;
the second control unit is used for sending a brake-separating signal to an inter-connection breaker of the power flow controller breaker and the high-capacity energy storage battery and disconnecting the power flow controller breaker and the inter-connection breaker;
the high-capacity energy storage battery is directly connected with the direct-current power distribution network through the direct-connection circuit breaker, and is also connected with the direct-current power distribution network through the DC/DC conversion module and the indirect circuit breaker.
7. The system of claim 5, further comprising: a fault recovery module, comprising:
the signal receiving unit is used for receiving a feedback signal of the disconnection state of the direct current breaker of the load branch circuit;
a third control unit for closing an indirect circuit breaker of the power flow controller and the high-capacity energy storage battery;
a fourth control unit for disconnecting a direct connection breaker of the high capacity energy storage battery.
8. The system for rapidly cutting off a direct current distribution network according to any one of claims 5 to 7,
and the capacity of the high-capacity energy storage battery is a preset multiple of the load of the direct current power distribution network system.
9. An electronic device, comprising: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the method of fast cutting off a dc power distribution network according to any one of claims 1 to 4.
10. A computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the method for fast cutting off a dc distribution network according to any one of claims 1 to 4.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116960885A (en) * | 2023-09-20 | 2023-10-27 | 广东电网有限责任公司中山供电局 | Automatic cutting and isolating method, device and equipment for switch of electrochemical energy storage station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116960885A (en) * | 2023-09-20 | 2023-10-27 | 广东电网有限责任公司中山供电局 | Automatic cutting and isolating method, device and equipment for switch of electrochemical energy storage station |
| CN116960885B (en) * | 2023-09-20 | 2024-01-23 | 广东电网有限责任公司中山供电局 | Automatic cutting and isolating method, device and equipment for switch of electrochemical energy storage station |
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