KR20150080233A - Microgrid capable of Dispersed Generators Plug And Play based on IEC 61850 and Plug And Play Method therefor - Google Patents

Abstract

Disclosed are a microgrid capable of decentralized power supply plug and play based on IEC 61850 and a decentralized power supply plug and play method thereof. The microgrid according to the present invention includes: a distribution line including multiple and various kinds of decentralized power supplies and line impedance; loads dispersed and distributed on the distribution line; and a microgrid energy management system (EMS) engaging in data transmission and reception between each decentralized power supply and each load.

Description

IEC 61850 based distributed power plug-and-play microgrid and its distributed power plug-and-play method [0002]

The present invention relates to a distributed power pluggable microgrid based on IEC 61850 and a distributed power plug-and-play method thereof, and more particularly, to a microgrid plug-and- IEC 61850 based distributed power plug-and-play microgrid and its distributed power plug-and-play method that dynamically sets the IEC 61850 network configuration on-line by sensing state.

The Micro Grid refers to a small power grid consisting of distributed power sources such as multiple renewable energy sources, distribution and distribution, and distributed loads. Most micro-grids include Microgrid EMS (Microgrid Energy Management System), a centralized, integrated control device designed to increase the quality of electricity in the grid and optimize the production and consumption of energy efficiency or minimize costs, Distributed power supplies, load devices, protection devices, and measuring devices in the grid are connected to the microgrid energy management device via a communication network to transmit and receive necessary data.

IEC 61850 International Standard, started as an intelligent substation automation technology, is widely used in the retrofitting of newly installed substations and existing substations by providing a virtual data model and a standardized communication method of substation internal devices. We are expanding our range.

In addition to the spread of Smart Grid, microgrid and IEC 61850 technologies are expanding in the market. Currently, IEC 61850 technology is being applied in the field of distributed power supply. In the future, IEC 61850 based data communication is applied to micro grid. It is expected to be possible.

However, the IEC 61850 technology performs structural design of data communication with offline engineering using original system engineering tool and IED engineering tool, and it is required to perform engineering design again to modify network design once completed. / There is a limit to not being able to provide a dynamic configuration to be removed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide an IEC 61850 network configuration in which a micro grid plug and play manager detects micro- 61850 based distributed power plug and play microgrid and its distributed power plug and play method.

According to an aspect of the present invention, there is provided a micro grid including: a distribution line including a plurality of distributed power sources and line impedances of various types; Load distributed to distribution lines; And a micro grid EMS (Energy Management System) relaying data transmission / reception between each of the distributed power sources and the load and the network, wherein the distributed power source is a MicroGrid Plug & Play (mPnP) device, .

A large number of distributed power sources include a battery energy storage system (BESS), a combined heat & power system (CHP), a fuel cell (FC), a wind turbine (WT) (PV: Photo Voltaics), and a diesel generator (EG: Engine Generator).

Here, the micro grid EMS is connected to the upper monitoring control system or the neighboring micro grid through the network to transmit the configuration information and the monitoring data, and receives management and control commands from the upper monitoring control system.

In addition, microGrid EMS assigns a network IP (Internet Protocol) address when the mPnP device is connected to the network, and registers the mPnP device.

In addition, microgrid EMS receives an ICD (IED Capability Description) file indicating the capability of the mPnP device using the GetFile service of the ACSI (Abstract Communication Service Interface) of IEC 61850 when receiving a connection request to the micro grid from the mPnP device And analyzes the information including the type, capability, and characteristics of the distributed power source, and updates the SSD (System Specification Description) and the SCD (Substation Configuration Description) file storing the entire system configuration.

The microgrid EMS also sends a CID (Configured IED Description) and an IID (Instantiated IED Description) file specifying a specific name and address of the mPnP device and confirms the registration completion message when final setting of the mPnP device is completed, Lt; / RTI >

Also, the micro grid EMS periodically checks the connection status of the mPnP device, deletes the mPnP device when the response of the mPnP device is not longer than the set time due to a network problem or a failure of the mPnP device, Update SSD and SCD.

According to an aspect of the present invention, there is provided a distributed power plug and play method including: a distribution line including a plurality of distributed power sources of various types and a line impedance; a load distributed and distributed in a distribution line; And a micro grid EMS for relaying data transmission / reception between the load and the network, the micro grid EMS distributed power plug and play method in a micro grid, wherein when a connection is requested by a new mPnP device, Requesting an ICD file using the GetFile service of ACSI of 61850; Analyzing information on at least one of the types, capabilities, and characteristics of the distributed power source by analyzing the received ICD file in response to the ICD file requesting step; Updating the changes to the SSD and SCD files based on the information analyzed by the analysis step; And transmitting the CID and the IID file specifying the specific name and address of the mPnP device, and confirming the registration completion message of the mPnP device to end the plug and play process.

The above-described distributed power plug-and-play method includes: periodically checking the connection status of the mPnP device; Deleting the mPnP device when the response of the mPnP device is not present for a predetermined period of time due to a problem in the network or a failure of the mPnP device; And updating the system configuration database files SSD and SCD.

According to the present invention, by configuring the micro grid by applying the IEC 61850 based distributed power interface and the plug-and-play network structure, the micro grid structure can be automatically formed without changing the network configuration by user input. Distributed power supplies are connected to the power grid and network of the microgrid and automatically registered as a member of the microgrid and can be operated.

In addition, it is possible to easily implement a large-scale micro grid in which a plurality of distributed power sources applying a standardized data model developed in a small-scale micro grid composed of a fixed distributed power source and a control device are freely connected to or separated from the micro grid do.

In addition, the plug-and-play technology contributes to the dissemination of residential distributed power sources and the expansion of the related market by providing a base on which the most advanced power technology can be easily used to actual consumers of renewable energy distributed power sources.

FIG. 1 is a schematic diagram of a microgrid constructed of a distributed power source based on IEC 61850 according to an embodiment of the present invention.
2 is a view schematically showing an internal configuration of a micro grid EMS.
3 is a flowchart illustrating a process of registering a new mPnP device by the mPnP manager shown in FIG.
FIG. 4 is a flowchart illustrating a process of the mPnP manager shown in FIG. 2 to delete an mPnP device that has no response.
FIG. 5 is a flowchart showing a process of registering the mPnP device with the smart grid EMS.
FIG. 6 is a conceptual diagram showing an embodiment in which the mPnP device of the distributed power source according to the present invention, the mPnP manager of the micro grid EMS, and the network manager implement the plug and play function of the distributed power source based on IEC 61850.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention. Here, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

FIG. 1 is a schematic view of a microgrid including a distributed power source capable of IEC 61850 interface according to the present invention and a micro grid EMS.

1, a micro-grid according to the present invention the distribution line (120 identify the different types of the plurality of distributed power (110 to 115) and a line impedance _{(X L1 ~ X L5, (} 121 ~ 125)) consisting of A load 130 to 135 dispersedly distributed on a distribution line, a micro grid energy management system (EMS) 100, a network manager 102, a network communication line 150, a gateway 151, An STS (Static Switch, 116) for controlling the connection between the grid and the power system, and a transformer 126.

1, the distributed power sources 110 to 115 include an energy storage system (BESS) 110, a combined heat and power system (CHP) 111, a fuel cell (FC) 112, a wind turbine (WT) 113, a photovoltaic generator (PV) 114, and an engine generator (EG) 115. However, no. Also, in the configuration diagram of Fig. 1, the distribution line is a single distribution line, but it can be applied to a distribution network of a ring type or a mesh type though it is a plurality of distribution lines.

Each of the distributed power sources 110 to 115 and the STS 116 is an mPnP (microgrid plug & play) device having an IEC 61850 interface and is connected to a micro grid EMS 100, the network manager 102, and the like. The network communication line 150 may be replaced with the distribution line 120 in the case of a network using communication using a power line carrier (PLC) method. The micro grid EMS 100 is connected to the upper monitoring control system or the neighboring micro grid through the gateway 151 to transmit the configuration information and the monitoring data of the micro grid and receive the management control command of the upper monitoring control system.

2 is a block diagram schematically showing the internal structure of the micro grid EMS 100. As shown in FIG.

2, the microgrid EMS 100 is connected to the network communication line 150 through the communication interface block 101 and includes an IEC 61850 interface block 103 (hereinafter referred to as " IEC 61850 interface block " An IEC 61850 database 104 for storing the entire system configuration such as a microgrid power network configuration, a network configuration, and a transmission / reception data model in the form of an SSD and an SCD file, an XML parser block 105 for analyzing a received SCL file, An mPnP manager block 106 that plays a core role of the EMS and an EMS block 109 that performs basic functions of the EMS such as new power generation prediction, load prediction, failure analysis / safety analysis, operation planning, and energy optimization, A Supervisory Control And Data Acquisition (SCADA) block 107 for collecting and controlling lower data, a Human Machine Interface (HMI) Block 108 and the like. The network manager 102 shown in FIG. 1, which is responsible for the DHCP server or the DHCP helper role and management of the network as a whole, may be separately installed, and may be configured as a block in the micro grid EMS 100 .

3 is a flowchart illustrating a process of registering a new mPnP device by the mPnP manager shown in FIG. At this time, if the mPnP device is connected to the network prior to the mPnP registration process of FIG. 3, the network IP address allocation process should be performed. This is based on Dynamic Host Configuration Protocol (DHCP), a technology based on the existing IP computer network. When mPnP, a DHCP client, sends a DHCP server discovery packet to a UDP broadcast, the DHCP server or DHCP helper Called DORA, which is constituted by a DHCP (DHCP) server's DHCP acknowledgment in response to a DHCP client's DHCP request (Request).

Referring to FIG. 3, when a UDP (User Datagram Protocol) broadcast packet for mPnP manager discovery is detected and a connection is requested by a new mPnP device (step 300), the micro grid EMS 100 transmits An ICD (IED Capability Description) file is requested using the GetFile service of the Abstract Communication Service Interface (ACSI) (step 301).

If the ICD file is received in response to the ICD file request step 301, the microgrid EMS 100 analyzes the received ICD file and interprets information about at least one of the type, capabilities, and characteristics of the distributed power source 302).

At this time, the micro grid EMS 100 updates the changes in SSD (System Specification Description) and SCD (Substation Configuration Description) files (step 303) based on the information analyzed by the analysis step (step 302) The CID (Configured IED Description) and the IID (Instantiated IED Description) file specifying the specific name and address of the mPnP device are transmitted (step 304), and the registration completion message of the mPnP device is checked to end the plug and play process (step 305).

FIG. 4 is a flowchart illustrating a process of the mPnP manager shown in FIG. 2 to delete an mPnP device that has no response.

Referring to FIG. 4, the micro grid EMS 100 periodically checks the connection status of the mPnP device (step 310) and determines whether there is a response of the corresponding mPnP device due to a network problem or a failure of the mPnP device 311). If there is no response for a preset time, the corresponding mPnP device is deleted (step 312), and the system configuration database files SSD and SCD are updated (step 313).

FIG. 5 is a flowchart showing a process of registering the mPnP device with the smart grid EMS. FIG. 5 illustrates a process of registering in the micro grid EMS in the mPnP device according to an embodiment of the present invention.

After the IP address assignment and the network setting are completed by the DHCP protocol, the mPnP device transmits an UDP broadcast packet to retrieve the mPnP manager (step 320). After detecting the response of the mPnP manager (step 321) and registering the mPnP manager (step 322), the ICP file is transmitted according to the request of the mPnP manager (step 323). After that, the mPnP manager obtains and updates the final configuration file of the distributed power supply device to be determined and transmitted (step 324), and transmits the registration completion signal after completing its own setting (step 325) .

6 is a conceptual diagram showing an embodiment in which the mPnP device of the distributed power supply according to the present invention, the mPnP manager of the micro grid EMS 100, and the network manager 102 implement the Plug and Play function of the IEC 61850 based distributed power source , For example, when the energy storage device 600 is newly connected to the microgrid. That is, when the energy storage device 600 is newly connected to the micro grid, if the energy storage device 600 broadcasts its device information in order to request an address, the micro grid EMS 100 and the network manager 600, The new energy storage device 600 is registered through device registration and address allocation process by the controller 102 to perform plug and play of the distributed power.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. You will understand.

Claims (9)

A distribution line including a plurality of distributed power sources and line impedances of various types;
A load dispersedly distributed in the distribution line; And
And a micro grid EMS (Energy Management System) relaying data transmission / reception between each of the distributed power sources and the load and the network,
Wherein the distributed power source is an mPnP (Microgrid Plug & Play) device, and is registered or deleted in the microgrid EMS. The method according to claim 1,
Wherein the plurality of distributed power sources include:
Combined Heat & Power (CHP), Fuel Cell (FC), Wind Turbine (WT), Photovoltaic (PV) , And a diesel generator (EG: Engine Generator). The method according to claim 1,
In the micro grid EMS,
Wherein the micro grid is connected to the upper monitoring control system or the neighboring micro grid through the network to transmit the configuration information and the monitoring data, and receives the management and control command from the upper monitoring control system. The method according to claim 1,
In the micro grid EMS,
wherein when the mPnP device is connected to a network, a network IP address is assigned, and the mPnP device is registered.
5. The method of claim 4,
In the micro grid EMS,
Upon receipt of the access request for the micro grid from the mPnP device, an ICD (IED Capability Description) file indicating the capability of the mPnP device is received using the GetFile service of the Abstract Communication Service Interface (ACSI) of IEC 61850, (SSD) and a Substation Configuration Description (SCD) file that stores the overall system configuration by analyzing information including the type, capability, and characteristics of the distributed power source. 6. The method of claim 5,
In the micro grid EMS,
A CID (Configured IED Description) and an IID (Instantiated IED Description) file specifying a specific name and address of the mPnP device are transmitted, and when the final setting of the mPnP device is completed, the registration completion message is confirmed to end the flag and play process The micro grid. The method according to claim 1,
In the micro grid EMS,
Periodically checking the connection status of the mPnP device, deleting the mPnP device when the response of the mPnP device is not present for a predetermined time due to a problem of the network or the mPnP device, updating the system configuration database files SSD and SCD Wherein the microgrid is a microgrid. And a micro grid EMS for relaying data transmission / reception between each of the distributed power sources and the load and a network, the distribution grid including a plurality of distributed power sources of various kinds and a distribution line including line impedance, A method of dispersed power plug-and-play by a microgrid EMS in a microgrid,
Requesting an ICD file using a GetFile service of ACSI of IEC 61850 when a connection is requested by a new mPnP device;
Analyzing information on at least one of the type, capability, and characteristics of the distributed power source by analyzing the received ICD file in response to the ICD file requesting step;
Updating the changes in the SSD and SCD files based on the information analyzed by the analyzing step; And
Transmitting a CID and an IID file specifying a specific name and address of the mPnP device, checking a registration completion message of the mPnP device, and ending the plug and play process
And a power supply for supplying power to the power supply. 9. The method of claim 8,
Periodically checking the connection status of the mPnP device;
Deleting the mPnP device when a response of the mPnP device is not present for a predetermined time or longer due to a problem in the network or a failure of the mPnP device; And
Steps to update the system configuration database files SSD and SCD
Lt; RTI ID = 0.0 > 1, < / RTI >

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