CN104682378A - Microgrid system - Google Patents

Abstract

A microgrid system, including a plurality of unit interface devices, the outside of one unit interface device is connected to the power grid, and the outer power interface and outer communication interface of any other unit interface device are respectively connected to the same controlled object, and each unit interface device The inner communication interface of the unit interface device is connected with the inner communication interface of the adjacent unit interface device of the unit interface device through a communication line; the inner power interface of each unit interface device is connected with the inner power interface of the remaining unit interface devices through a power transmission line; The controlled objects include loads and micro-sources; the unit interface device connected to the grid on the outside interacts with the grid for information and power, and the unit interface device connected to the controlled object on the outside performs information and power interactions with the controlled object to realize intelligent control of the controlled object ; Any unit interface device communicates with the adjacent unit interface device of the unit interface device through the communication line. Intelligent control of the microgrid can be realized.

Description

A microgrid system

technical field

The invention relates to the technical field of micro-grids, in particular to a micro-grid system.

Background technique

At present, the microgrid has become a useful supplement to the power grid because of its environmental friendliness and low construction cost. In a microgrid, a large number of micro-sources (such as new energy power supplies and small traditional power supplies) and loads (such as refrigerators, air conditioners, etc.) The degree of importance and the characteristics of power consumption are also very different, and it is difficult to realize the intelligent control of the microgrid.

Contents of the invention

The embodiment of the invention discloses a micro-grid system, which can realize intelligent control of the micro-grid.

The first aspect of the embodiment of the present invention discloses a microgrid system, including:

A plurality of unit interface devices, wherein the outer power interface and the outer communication interface of one of the unit interface devices are respectively connected to the power grid through a power transmission line and a communication line, and the outer power interface and outer communication interface of any other unit interface device Connect with the same controlled object through power transmission lines and communication lines respectively, and connect the inner communication interface of each unit interface device with the inner communication interface of the adjacent unit interface device of the unit interface device through communication lines; The inner power interface of one of the unit interface devices is connected to the inner power interfaces of the remaining unit interface devices through a power transmission line; wherein, the controlled object includes a load and a micro source; wherein, the outer unit interface device connected to the power grid is used for Perform information and power interaction with the power grid, and the unit interface device connected to the controlled object on the outside is used for information and power interaction with the controlled object, so as to realize intelligent control of the controlled object; wherein, any one of the controlled objects The unit interface device communicates with the adjacent unit interface device of the unit interface device through a communication line.

In a first possible implementation manner of the first aspect of the embodiments of the present invention, a protection switch is connected in series on the power transmission line connected to the external power interface of any one of the unit interface devices.

With reference to the first possible implementation of the first aspect of the embodiments of the present invention, in the second possible implementation of the first aspect of the embodiments of the present invention, any one of the unit interface devices has a built-in static switch, a processor and A monitoring unit, wherein one connection end of the static switch is electrically connected to the inner power interface of the unit interface device, the other connection end of the static switch is electrically connected to the outer power interface of the unit interface device, and the static switch The control end of the control terminal is connected to the processor, and the processor is connected to the monitoring unit, and the monitoring unit monitors whether the controlled object connected to the outside of the unit interface device and/or the unit interface device is abnormal, if the unit The controlled object connected to the outside of the interface device and/or the unit interface device is abnormal, output a control command to the processor, and the processor responds to the control command and controls the static switch to disconnect the unit interface device from the The outside of the unit interface device is connected to the electrical connection between the controlled objects.

With reference to the second possible implementation of the first aspect of the embodiment of the present invention, in the third possible implementation of the first aspect of the embodiment of the present invention, the processor collects the controlled The operating parameters of the object, and intelligently control the controlled object connected to the outside of the unit interface device according to the operating parameters.

With reference to the second possible implementation manner of the first aspect of the embodiments of the present invention, in a fourth possible implementation manner of the first aspect of the embodiments of the present invention, the processor is configured to detect that the unit interface When the controlled object connected outside the device has excessive short-circuit power, the static switch is controlled to disconnect the electrical connection between the unit interface device and the controlled object connected outside the unit interface device.

With reference to the second possible implementation manner of the first aspect of the embodiments of the present invention, in the fifth possible implementation manner of the first aspect of the embodiments of the present invention, the processor is configured to detect that the unit interface When the short-circuit power of the device is insufficient to trip the protection switch, the static switch is controlled to disconnect the electrical connection between the unit interface device and the controlled object connected outside the unit interface device.

With reference to any one of the second to fifth possible implementation manners of the first aspect of the embodiments of the present invention, in a sixth possible implementation manner of the first aspect of the embodiments of the present invention, the processor and the Neighboring unit interface devices of the unit interface devices communicate via communication lines.

With reference to the sixth possible implementation manner of the first aspect of the embodiments of the present invention, in the seventh possible implementation manner of the first aspect of the embodiments of the present invention, the communication line includes a wired communication line or a wireless communication line.

In an eighth possible implementation manner of the first aspect of the embodiments of the present invention, the power transmission line includes a cable or a pole-tower type power transmission line.

In a ninth possible implementation manner of the first aspect of the embodiments of the present invention, any one of the unit interface devices has at least two internal communication interfaces.

In the embodiment of the present invention, among the multiple unit interface devices included in the microgrid system, the outer power interface and the outer communication interface of one unit interface device are respectively connected to the grid through power transmission lines and communication lines, and the outer power interface of any other unit interface device The interface and the outer communication interface are respectively connected to the same controlled object, and the inner communication interface of each unit interface device is connected to the inner communication interface of the adjacent unit interface device of the unit interface device through a communication line, and each unit interface The inner power interface of the device is connected to the inner power interface of the other unit interface devices through the power transmission line, so that the unit interface device connected to the controlled object on the outside can exchange information and power with the controlled object, so as to realize the control of the controlled object. Intelligent control; further, any unit interface device communicates with the adjacent unit interface device of the unit interface device through the communication line, which can realize the coordination of the microgrid.

In the embodiment of the present invention, the microgrid system also has the following advantages:

1) Strong compatibility, more suitable for distributed energy with many types and scattered capacity;

2) The implementation method is simple, and both the micro-source and the load are connected to the network through a standard unit interface device;

3) The expansion method is flexible, only need to add the unit interface device and the necessary connecting lines;

4) The cost is low, and it has a greater cost advantage than the solution realized by advanced measurement and control devices.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic structural diagram of a microgrid system disclosed in FIG. 1 according to an embodiment of the present invention;

2 is a schematic diagram of the interconnection structure of a unit interface device in the microgrid system disclosed in the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a unit interface device in the microgrid system disclosed in the embodiment of the present invention;

Fig. 4 is a schematic structural diagram of another unit interface device in the microgrid system disclosed in the embodiment of the present invention;

Fig. 5 is a schematic structural diagram of another microgrid system disclosed in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The embodiment of the invention discloses a micro-grid system, which can realize intelligent control of the micro-grid. Each will be described in detail below.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a microgrid system disclosed in an embodiment of the present invention. As shown in Figure 1, the microgrid system can include:

Multiple unit interface devices 1, 2, 3, 4, 5;

Wherein, the external power interface and the external communication interface of the unit interface device 1 are respectively connected to the power grid through the power transmission line a and the communication line 11 .

Wherein, the outer power interface and the outer communication interface of the unit interface device 2 are respectively connected to the same controlled object through the power transmission line b and the communication line 12, as shown in Figure 1, the controlled object connected to the outer side of the unit interface device 2 may be micro source.

Wherein, the outer power interface and the outer communication interface of the unit interface device 3 are respectively connected to the same controlled object through the power transmission line c and the communication line 13, as shown in Figure 1, the controlled object connected to the outer side of the unit interface device 3 can also be It is Weiyuan.

Wherein, the outer power interface and the outer communication interface of the unit interface device 4 are respectively connected to the same controlled object through the power transmission line d and the communication line 14. As shown in Figure 1, the controlled object connected to the outer side of the unit interface device 4 can be load L.

Wherein, the outer power interface and the outer communication interface of the unit interface device 5 are respectively connected to the same controlled object through the power transmission line e and the communication line 15, as shown in Figure 1, the controlled object connected to the outer side of the unit interface device 5 can also be is the load L.

Wherein, the inboard communication interface of the unit interface device 1 and the inboard communication interface of the adjacent unit interface device 2 of the unit interface device 1 are connected by a communication line 17; The internal communication interfaces of the unit interface device 3 are connected by a communication line 18 .

Wherein, the inboard communication interface of the unit interface device 2 and the inboard communication interface of the adjacent unit interface device 1 of the unit interface device 2 are connected by a communication line 17; The internal communication interfaces of the unit interface device 4 are connected by a communication line 19 .

Wherein, the inboard communication interface of unit interface device 3 and the inboard communication interface of adjacent unit interface device 1 of unit interface device 3 are connected by communication line 18; The internal communication interfaces of the unit interface device 5 are connected by a communication line 21 .

Wherein, the inboard communication interface of unit interface device 4 and the inboard communication interface of adjacent unit interface device 2 of unit interface device 4 are connected by communication line 19; The internal communication interfaces of the unit interface device 5 are connected by a communication line 20 .

Wherein, the inboard communication interface of unit interface device 5 and the inboard communication interface of adjacent unit interface device 3 of unit interface device 5 are connected by communication line 21; The internal communication interfaces of the unit interface device 4 are connected by a communication line 20 .

Wherein, the inner power interface of any unit interface device (such as 1) is connected to the inner power interfaces of other unit interface devices (such as 2-5) through the power transmission line 16 .

Among them, the unit interface device 1 is used for information and power interaction with the grid. For example, the unit interface device 1 can exchange information with the power grid, so that the power grid can know the interface power required by the unit interface device 1 , and then the power grid can input the corresponding interface power for the unit interface device 1 .

Among them, any other unit interface device (such as 2-5) is used for information and power interaction with the controlled object, so as to realize the intelligent control of the controlled object.

Wherein, any unit interface device (such as 4) communicates with the adjacent unit interface devices (such as 2 and 5) of the unit interface device (such as 4) through communication lines.

In one embodiment, in the microgrid system shown in FIG. 1 , a protection switch is connected in series on the transmission line connected to the external power interface of any unit interface device. As shown in Figure 1, a protective switch 6 is connected in series on the power transmission line a connected to the outer power interface of the unit interface device 1; a protective switch 7 is connected in series on the power transmission line b connected to the outer power interface of the unit interface device 2; the unit interface device 3 A protective switch 8 is connected in series on the power transmission line c connected to the outer power interface of the unit interface device 4; a protective switch 9 is connected in series on the power transmission line d connected to the outer power interface of the unit interface device 4; on the power transmission line e connected to the outer power interface of the unit interface device 5 A protection switch 10 is connected in series.

Wherein, the protection switches 6, 7, 8, 9, and 10 may be traditional protection switches, and the protection switches may be configured according to a general setting method.

Wherein, the communication lines 11, 12, 13, 14, 15, 17, 18, 19, 20, 21 include wired communication lines or wireless communication lines. Wired communication lines include RS232, RS485, etc., while wireless communication lines include ZigBee, GPRS and other wireless communication lines.

Wherein, the transmission lines a, b, c, d, e and 16 may be cables or pole-tower type transmission lines.

In the embodiment of the present invention, when the objects connected to the outside of the unit interface device are different, the functions of the unit interface device are different, as follows:

1) Connect the micro-source; control the micro-source operating mode (such as PQ mode, VF mode, etc.), power control (active power control, reactive power control), frequency control (up-frequency, down-frequency), switch control, and other micro-sources Parameter configuration, etc. At the same time, the operating parameters of the micro-source are collected to realize the visibility of the micro-source.

2) Connect the load; control the load switch (according to different time, electricity price, network working conditions), and configure the parameters of the compatible load (power size, power factor, etc.).

3) Connect to the power grid; collect, receive and upload the information of the power grid and the micro-grid, and realize the switching between the "off-grid mode" and "grid-connected mode" of the micro-grid system. Once the system mode is converted, the operating characteristics of the entire system will change. The unit interface device sends information to other unit interfaces to reconfigure and adjust each micro-source and load in the system.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram of an interconnection structure of unit interface devices in a microgrid system disclosed in an embodiment of the present invention. As shown in Figure 2, in the interconnection structure of the unit interface device:

The inner communication interface of any unit interface device is connected to the inner communication interface of the adjacent unit interface device of the unit interface device through a communication line, and the inner power interface of any unit interface device is connected to the inner side of the other unit interface devices through the power transmission line. Power interface connection; among them, the outside of one unit interface device is connected to the power grid, and the outside power interface and outside communication interface of any other unit interface device are respectively connected to the same controlled object, and the unit interface device connected to the outside of the grid communicates with the power grid. Power interaction, the unit interface device connected to the controlled object on the outside performs information and power interaction with the controlled object to realize the intelligent control of the controlled object; any unit interface device and the adjacent unit interface device of the unit interface device through the communication line to communicate.

Among them, the interconnection of the unit interface devices shown in Figure 2 can form a micro-grid system. When the outside of any unit interface device is connected to the grid, the integration of the micro-grid system and the power network can also be realized.

Wherein, the communication line can be a wired communication line or a wireless communication line, and the wired communication line can use RS232, RS485, etc., and the wireless communication line can use Zigbee, GPRS, etc. In specific scenarios involving network security, communication protocols can be specially set.

Among them, the interconnection structure of the unit interface device shown in Figure 2 is used to form a ring network, and the physical connection can be wired or wireless; the unit interface device is controlled in a peer-to-peer manner or in a master-slave manner Controlling, in the case of a single transmission line failure or communication line failure, the visibility of the entire network information can still be ensured.

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of a unit interface device in a microgrid system disclosed in an embodiment of the present invention. As shown in Figure 3, in the unit interface device 25:

The inboard communication interfaces 22 and 23 of the unit interface device 25 can be respectively connected to the inboard communication interfaces of the left and right two adjacent unit interface devices of the unit interface device 25 through communication lines, and the outside communication interface 24 of the unit interface device 25 can be connected to the power grid through communication lines , micro source or load, the inner power interface 26 of the unit interface device 25 can be connected with the inner power interfaces of the remaining unit interface devices through the transmission line, and the outer power interface 27 of the unit interface device 25 can be connected with the grid, Either connection of micro source or load. Among them, when the outside of the unit interface device 25 is connected to the grid, the unit interface device 25 interacts with the grid for information (such as electrical parameters, operating parameters) and power; when the outside of the unit interface device 25 is connected to a micro source or load, the unit interface device 25 and Micro-sources or loads interact with information (such as electrical parameters, operating parameters) and power to realize intelligent control of micro-sources or loads. Wherein, the unit interface device 25 can communicate with the left and right adjacent unit interface devices of the unit interface device 25 through the communication lines through the inner communication interfaces 22 and 23 .

Please refer to FIG. 4 . FIG. 4 is a schematic structural diagram of another unit interface device in the microgrid system disclosed in an embodiment of the present invention. Wherein, compared with the unit interface device 25 shown in Figure 3, the unit interface device 25 shown in Figure 4 is built with:

Static switch 28, processor 29 and monitoring unit 30, wherein, one connection end of static switch 28 is electrically connected with the inside power interface 26 of unit interface device 25, and the other connection end of static switch 28 is connected with the outside power interface of unit interface device 25. The interface 27 is electrically connected, the control end of the static switch 28 is connected to the processor 29, and the processor 29 is connected to the monitoring unit 30, and the monitoring unit 30 monitors whether the controlled object connected to the outside of the unit interface device 25 and/or the unit interface device is abnormal If the controlled object connected to the outside of the unit interface device 25 and/or the unit interface device is abnormal, a control command is output to the processor 29, and the processor 29 responds to the control command and controls the static switch 28 to disconnect the unit interface device 25 from the The outside of the unit interface device 25 is connected to the electrical connection between the controlled objects.

Wherein, the processor 29 can collect the operating parameters of the controlled object connected outside the unit interface device 25, and intelligently control the controlled object connected outside the unit interface device according to the operating parameters.

Wherein, when the monitoring unit 30 detects that the controlled object connected to the outside of the unit interface device 25 has excessive short-circuit power, the processor 29 controls the static switch 28 to disconnect the unit interface device 25 from the outside connection of the unit interface device. The electrical connection between the controlled objects.

Wherein, when the monitoring unit 30 detects that the short-circuit power of the unit interface device 25 is not enough to trip the protection switch, the processor 29 controls the static switch 28 to disconnect the unit interface device 25 from the external connection of the unit interface device 25. Electrical connections between controlled objects.

Wherein, when the outer power interface 27 of the unit interface device 25 shown in Figure 4 and the transmission line between the controlled object have a protection switch in series, the unit interface device 25 shown in Figure 4 can realize the static switch 28 and the protection switch The series connection makes the characteristics of "fast speed" of static switch and "high reliability" of protection switch get a good combination.

In the embodiment of the present invention, the static switch 28 is built in the unit interface device 25, and can break the electrical connection with the micro-source, the load, and the power grid according to the command of the processor 29.

In the embodiment of the present invention, when a protective switch is connected in series on the transmission line between the outer power interface 27 of the unit interface device 25 shown in FIG. The protection switch can be manually controlled to open.

When the microgrid and the grid are in the grid-connected mode, if the monitoring unit 30 detects that an abnormality occurs in the grid, causing the grid to have a large short-circuit power, the protection switch will perform overcurrent protection.

When the microgrid and the grid are in the off-grid mode, if the monitoring unit 30 detects an abnormality in the microgrid, the short-circuit capacity of the microgrid is insufficient to trip the protection switch, and the static switch can be used between the unit interface module and the controlled object. electrical connection between.

In the embodiment of the present invention, for relatively complex asymmetrical faults, etc., the unit interface device can analyze and judge the electrical parameters to locate the fault, and issue an order to make the static switch cut out the fault.

In the embodiment of the present invention, multiple unit interface devices can realize topology reconstruction of micro-sources and loads in the micro-grid through information processing, and energy and information will be recombined to meet diversified power supply requirements.

Please refer to FIG. 5 . FIG. 5 is a schematic structural diagram of another microgrid system disclosed in an embodiment of the present invention. In the micro-grid system shown in Figure 5, the interconnection structure of the unit interface device shown in Figure 2 can be used to realize the interconnection of the power grid, micro-sources, and loads, wherein the micro-sources include bidirectional inverters, grid-connected inverters Appliances and loads L include refrigerators, washing machines, air conditioners, and lighting. In the microgrid system shown in FIG. 5 , the connection relationship between the unit interface device and the controlled object, and the connection relationship between the unit interface devices have been introduced in the previous embodiments, and will not be repeated here. In the micro-grid system shown in Figure 5, the unit interface device can exchange information and power with micro-sources and loads to realize the control of micro-sources and loads, and can also exchange information and power with the grid. details as follows:

1. Load control:

1) Refrigerator, the unit interface device can interact with the refrigerator for information and power, and control the 24-hour uninterrupted operation of the refrigerator;

2) The washing machine, the unit interface device can exchange information and power with the washing machine, and control the washing machine to run during the low peak time of power consumption, so as to reduce the consumption of electricity;

3) Air conditioner, the unit interface device can exchange information and power with the air conditioner, and control the air conditioner to operate under operating parameters (such as power, start-up time, operating temperature, wind speed, and operating time);

4) Lighting, the meta-interface device can exchange information and power with lighting, and control the operation under operating parameters (such as power, start-up time, lighting brightness, etc.).

2. Micro source control:

1) Bi-directional inverter, the unit interface device can exchange information and power with the bi-directional inverter. When the inverter is in the on-grid and off-grid mode, when it is running in the VF mode, it controls the voltage and frequency of the bidirectional inverter.

2) For the grid-connected inverter, the unit interface device can exchange information and power with the grid-connected inverter. When the grid-connected inverter continues to operate in PQ mode, it can control the operating parameters of the grid-connected inverter.

3. Grid interaction:

The unit interface device can collect the node information of the power grid in real time, exchange the information of the power grid and the microgrid, and make predictions at the same time. When the power grid or microgrid is abnormal, it can respond in time, for example, it can notify the adjacent unit interface device through the communication line.

In the embodiment of the present invention, among the multiple unit interface devices included in the microgrid system, the outer power interface and the outer communication interface of one unit interface device are respectively connected to the grid through power transmission lines and communication lines, and the outer power interface of any other unit interface device The interface and the outer communication interface are respectively connected to the same controlled object, and the inner communication interface of each unit interface device is connected to the inner communication interface of the adjacent unit interface device of the unit interface device through a communication line, and each unit interface The inner power interface of the device is connected to the inner power interface of other unit interface devices through the power transmission line, so that the unit interface device connected to the controlled object on the outside can communicate with the controlled object (for example, the controlled object can notify its operating parameter value Unit interface device, the unit interface device configures the controlled object with the required operating parameter value) and power interaction (for example, the controlled object can inform the unit interface device of the power it needs, and the unit interface device configures the controlled object the required power) to achieve intelligent control of the controlled object; further, any unit interface device communicates with the adjacent unit interface device of the unit interface device through a communication line, which can realize the coordination of the microgrid .

In the embodiment of the present invention, the microgrid system also has the following advantages:

1) Strong compatibility, more suitable for distributed energy with many types and scattered capacity;

2) The implementation method is simple, and both the micro-source and the load are connected to the network through a standard unit interface device;

3) The expansion method is flexible, only need to add the unit interface device and the necessary connecting lines;

4) The cost is low, and it has a greater cost advantage than the solution realized by advanced measurement and control devices.

In the embodiment of the present invention, the integration of information flow and energy flow can be realized by connecting static switches and protection switches in series and connecting communication lines and transmission lines in parallel in the microgrid system.

In the embodiment of the present invention, as a new micro-grid system architecture of the micro-grid system, energy and information are fused in a new way. The interaction and fusion of information and energy can be achieved in other small power supply systems. promote.

Similarly, through the functional reorganization and integration of each controlled object, the microgrid system can bring a new development path, easier to use, lower cost, more professional products, and more user-friendly.

The microgrid system disclosed in the embodiment of the present invention has been introduced in detail above. The principles and implementation modes of the present invention have been explained by using specific examples in this paper. The description of the above embodiments is only used to help understand the present invention; at the same time, for the technical field Those of ordinary skill in the art will have changes in the specific implementation and scope of application according to the idea of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. a micro-grid system, is characterized in that, comprising:

Multiple unit unit interface device, wherein, the outboard power interface of a described unit unit interface device is connected with electrical network respectively by transmission line, communication line with outside communication interface, described in all the other any one, the outboard power interface of unit unit interface device is connected with same controlled device respectively by transmission line, communication line with outside communication interface, and is connected by communication line between the inner side communication interface of unit unit interface device described in each with the inner side communication interface of the adjacent cells interface arrangement of this unit unit interface device; The inboard power interface of unit unit interface device described in each is connected with the inboard power interface of unit unit interface device described in all the other by transmission line; Wherein, described controlled device comprises load and Wei Yuan; Wherein, the unit unit interface device that outside connects electrical network be used for carrying out information with described electrical network and power mutual, it is mutual that the unit unit interface device that outside connects controlled device is used for carrying out with described controlled device information and power, to realize the Based Intelligent Control to described controlled device; Wherein, unit unit interface device described in any one is communicated by communication line with the adjacent cells interface arrangement of this unit unit interface device.

2. micro-grid system according to claim 1, is characterized in that, the transmission line of the outboard power interface connection of unit unit interface device described in any one is in series with protection switch.

3. micro-grid system according to claim 2, it is characterized in that, described in any one, unit unit interface device is built-in with static switch, processor and monitoring means, wherein, a link of described static switch is electrically connected with the inboard power interface of this unit unit interface device, another link of described static switch is electrically connected with the outboard power interface of this unit unit interface device, the control end of described static switch is connected with described processor, described processor is connected with described monitoring means, extremely whether the controlled device that the outside that described monitoring means monitors this unit unit interface device connects and/or this unit unit interface device, if the controlled device that the outside of this unit unit interface device connects and/or this unit unit interface device are extremely, export control command to described processor, described processor responds described control command, control described static switch with the electrical connection between the controlled device disconnecting this unit unit interface device and be connected with the outside of this unit unit interface device.

4. micro-grid system according to claim 3, it is characterized in that, the operational factor of the controlled device that the outside that described processor gathers this unit unit interface device connects, and according to described operational factor, Based Intelligent Control is carried out to the controlled device that the outside of this unit unit interface device connects.

5. micro-grid system according to claim 3, it is characterized in that, described processor is used for, when described monitoring means detects that the controlled device that the outside of this unit unit interface device connects has excessive short-circuit power, controlling described static switch with the electrical connection between the controlled device disconnecting this unit unit interface device and be connected with the outside of this unit unit interface device.

6. micro-grid system according to claim 3; it is characterized in that; described processor is used for when being not enough to when described monitoring means detects the short-circuit power of this unit unit interface device described protection switch is tripped, and controls described static switch with the electrical connection between the controlled device disconnecting this unit unit interface device and be connected with the outside of this unit unit interface device.

7., according to the micro-grid system of claim 3 ~ 6 described in any one, it is characterized in that, described processor is communicated by communication line with the adjacent cells interface arrangement of this unit unit interface device.

8. micro-grid system according to claim 7, is characterized in that, described communication line comprises wire communication line or wireless communication line.

9. micro-grid system according to claim 1, is characterized in that, described transmission line comprises cable or pole-and-tower type power transmission line.

10. micro-grid system according to claim 1, is characterized in that, the inner side communication interface of unit unit interface device described in any one is at least two.