KR20100100399A - Electric supply automatic system of wavelength divison multiplexing bases for an electric supply protection cooperative information transfer - Google Patents

Abstract

PURPOSE: An automatic distribution system based on WDM for transferring power distribution protection coordination information applying the power supply network of a close loop mode is provided to individually transmit protective coordination information between terminals. CONSTITUTION: An FRTU(Feeder Remote Terminal Unit)(220) converts a control signal and protection cooperative signal information in a form of RS-232. The FRTU performs a protection coordination algorithm. An optical modem(230) converts the control signal into the first optical signal. A high speed data transmission unit(210) converts the protection coordination signaling information into the second optical signal. The high speed data transmission unit multiplexes the first optical signal and the second optical signal. The high speed data transmission unit transmits the multiplexed optical signal through one optical cable.

Description

Distribution automation system based on WMD for transmission protection cooperative information transmission {ELECTRIC SUPPLY AUTOMATIC SYSTEM OF WAVELENGTH DIVISON MULTIPLEXING BASES FOR AN ELECTRIC SUPPLY PROTECTION COOPERATIVE INFORMATION TRANSFER}

The present invention relates to a WDM-based distribution automation system for transmission protection coordination information transmission that enables the rapid interruption of power outage and uninterrupted recovery of the distribution automation system without establishing an additional optical communication network.

The distribution automation system is a communication device that is required for data request from the main device and the response of data from the remote terminal device. Generally, the distribution automation system is applied between the central device and the terminal device. The data is then communicated with the central unit through a communication match.

There are two methods of communication between the terminal and the central unit of the distribution automation system: a wired modem method using a dedicated line, a frequency sharing system method, and an optical modem method using a main optical fiber network. Occupies.

An optical modem is a device that converts electrical signals and optical signals. It is used for optical communication. It converts the electrical signal output of a computer into light intensity and sends it to an optical cable or converts the intensity of light from an optical cable into an electrical signal. Commonly referred to as typing on a computer.

However, the optical modem method currently used in the distribution automation system has only a data transmission function between the intermediate apparatus and the terminal apparatus, and there is no 1: 1 communication function between the terminal units (FRTUs). In order to transmit the power distribution protection coordination information used, since a direct communication between terminal devices is required, a separate optical communication network must be configured.

In addition, since a transmission line (optical communication network dedicated to protection coordination except for a backbone network composed of rings) is required for this purpose, a disadvantage arises in that facility costs are consumed.

In order to solve the problems of the prior art, the present invention adds wavelength division multiplexing technology to the existing distribution automation system, and logically separates the communication network by using one existing communication network without establishing a separate communication network. And WDM-based distribution automation system for transmission protection coordination information transmission that can apply closed loop power supply network to power system by transmitting protection coordination information between terminal devices in the field independently. It has a purpose.

In order to achieve the above object, the WDM-based distribution automation system for transmission protection coordination information transmission of the present invention is applied to a serial data photoelectric conversion technology and a conventional communication network for high-speed data processing within one cycle (16.7 ms) in a closed loop method. It can combine optical wavelength division multiplexing techniques for adding logical networks.

The present invention relates to a high-speed data transmission unit, comprising a serial data optical conversion module for converting a protective cooperative signal received in the form of a serial signal into an optical signal, the first optical signal and the serial data optical conversion module received from an optical modem It may include a WDM module for multiplexing the second optical signal converted by the.

In the present invention, the serial data photoelectric conversion module may integrate two independent serial data photoelectric conversion modules into one and transmit protection coordination signal information to each FRTU existing on both sides of the serial data photoelectric conversion module.

In addition, the present invention, in the distribution automation system for transmission of the transmission protection coordination information of the closed loop method, receiving the control signal and the protection coordination signal information of the system to convert to RS-232 form, FRTU operating the protection coordination algorithm And an optical modem for receiving the control signal and converting the control signal into a first optical signal, receiving the protection coordination signal information, converting the signal into a second optical signal, and multiplexing the first optical signal and the second optical signal. It may include a high-speed data transmission unit for transmitting to a higher server through one optical cable.

In the present invention, the FRTU may further include two RS-232 communication ports for communicating with the FRTU existing on both sides of the FRTU.

In the present invention, the wavelengths of the first optical signal and the second optical signal may be different from each other.

In the present invention, the wavelength of the first optical signal is 1310nm, the wavelength of the second optical signal may be configured to 1550nm.

The present invention is economical because it does not establish an additional communication network for transmission protection coordination signal transmission, but establishes a distribution protection coordination network in the distribution automation system by using an existing communication network logically.

In addition, the present invention provides a packet by quickly processing information exchange with the remote node involved in the distribution protection coordination operation within one cycle (16.7 ms) required by the protection coordination operation algorithm by the serial data photoelectric conversion device. There is an effect of suppressing time delay due to conversion (communication).

In addition, the present invention quickly exchanges the blackout information for the power failure section during power supply and other failures by exchanging the blackout information and the accident information by 1: 1 communication between the terminal equipment (FRTU) without time delay. Therefore, there is an effect that can use an uninterruptible power supply.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

1 is a view showing a power cut algorithm of the underground closed loop method according to an embodiment of the present invention, the power cut algorithm of the underground closed loop method achieves uninterrupted protection cooperation by the agent 1: 1 communication algorithm for each circuit In addition, the upper master communication port and the local 1: 1 communication port are separately provided to secure reliability of protection cooperation by reducing communication time.

Referring to FIG. 1, when the forward direction F is detected, a trip signal is transmitted to the associated high speed data transmission unit, and when the trip circuit receives the trip signal from the associated high speed data transmission unit, if the associated circuit is the reverse direction R, blocking ( Blocking), if forward (F), the trip signal is transmitted.

In case of a fault, the fault current of the RMU's interconnection circuit at both ends of the fault point is obtained by using the impedance divider to use the pure fault current without the load current regardless of the fault type (1 line ground, line short, and 3 phase short). The fault location can be displayed.

2A and 2B illustrate a WDM-based distribution automation system according to an embodiment of the present invention, and FIG. 2A illustrates a WDM-based distribution automation system including a high-speed data transmission unit for transmission protection coordination information transmission. FIG. 2B is a diagram illustrating a closed loop system implementation by connecting a plurality of distribution automation systems of FIG. 2A.

Existing optical modem communication network does not have 1: 1 communication function between FRTUs and needed an independent communication network for communication processing within 1 cycle (167ms). A distribution automation system was implemented by connecting a high-speed data transmission unit capable of transmitting high-speed protection coordination information based on WDM, which can be used in a distribution network of a network.

Referring to FIG. 2A, the distribution automation system 200 includes a high speed data transmission unit 210, a FRTU 220, and an optical modem 230.

The high speed data transmission unit 210 is configured to be detachably attached to the distribution automation system by integrating two serial converters in hardware, and different from the serial data optical conversion module 212 that converts the received serial signal into an optical signal. WDM module 214 for multiplexing the signal.

Since the serial data optical conversion module 212 transmits and receives a protection coordination signal with forward and reverse FRTUs based on the associated FRTU 220, that is, serial data, which is protection coordination data received by two RS-232 ports, Since two serial converters are required because they need to receive serial data), in the present invention, two serial converters are integrated in hardware to be manufactured on one printed circuit board (PCB) to form a serial data optical conversion module.

The serial data optical conversion module 212 converts the protection coordination signal received from the FRTU 220 into an optical signal and transmits the optical signal to the WDM module 214.

The WDM module 214 is a device that combines wavelengths to transmit a plurality of wavelengths to a single optical core, and more specifically, a first optical signal propagated over an existing optical cable in which the optical modem 230 exists to communicate with an upper server. And the serial data optical conversion module 212 combines the second optical signal to transmit a new wavelength in order to transmit the protection coordination signal of the FRTU in the forward and reverse directions.

In this case, the first optical signal and the second optical signal have different wavelengths, but are not limited to the present invention, but the first optical signal has a wavelength of 1310 nm and the second optical signal has a wavelength of 1550 nm.

The WDM module 214 transmits an optical wavelength signal of '1310 nm + 1550 nm', which is a new wavelength generated by combining the first optical signal and the second optical signal, through an existing optical cable.

The FRTU 220 transmits state information data such as switchgear and transformer installed on the distribution line to the upper server in the form of RS-232 (serial data) for power supply at the site of the distribution automation system, or occurs from the upper server. Receive and perform a signal.

In addition, for protection coordination operation, the communication information port (RS-232) connected to the host server through the optical modem is always transmitted and received. In addition to the two) may further include two communication ports (RS-232).

The two communication ports receive the protection coordination signal from the FRTU in the forward and reverse directions and transmit the protection coordination signal to the serial data optical conversion module. Accordingly, the WDM module 214 is wavelength-coupled with one optical cable existing without establishing a separate communication network. It is possible to construct an economical close loop type distribution automation system because it transmits distribution protection coordination information at high speed by using logically.

The optical modem 230 is connected to an optical network consisting of an existing optical cable, and is connected to the FRTU 220 in an RS-232 manner to transmit control signals and measurement data to an upper server (main unit), and received from an upper server. The control signal is transmitted to the FRTU 220. In more detail, the optical modem 230 converts a control signal of the RS-232 type from the RFTU into a first optical signal and transmits the first optical signal to the WDM module 214.

According to the present invention, since the control signal transmitted through the optical modem and the forward and reverse protection coordination signals of the FRTU are multiplexed and output through one optical cable, a separate cable for fast protection coordination is not required and thus an economical closed loop The distribution automation system of the method can be constructed.

Referring to FIG. 2B, the power distribution automation system of FIG. 2A is connected to hardware-integrate each serial data photoelectric conversion module that manages each signal linked in one board, and multiplexes signals through a WDM module. By demultiplexing, multiple high speed data transfer units can all be connected via a single fiber cable.

In addition, by transmitting the distribution protection coordination signal in the optical cable, the data transmission time within 2ms that satisfies the minimum operating time of 16.7ms of the communication network is possible. Detailed demo results may refer to FIGS. 4A to 4B below.

3 is a diagram illustrating a high speed data transmission unit according to an embodiment of the present invention.

Referring to FIG. 3, WDM East TX, WDM West TX, WDM East RX, and WDM West RX transmit and receive optical wavelengths (first wavelength + second wavelength), and each device receives the first wavelength and the first wavelength. It is divided into 2 optical wavelengths and transmitted by optical cable.

As described in FIG. 2B, an optical signal having a wavelength of 1550 nm connected to each other means a protection coordination information signal which is a second optical signal in the present invention, and an optical signal having a 1310 nm wavelength means a control signal which is a first optical signal. In this case, the first and second optical signals are not limited and include all optical signals having different wavelengths.

The signal of the first optical wavelength is converted into serial data through a serial data optical conversion device (CPU) through an optical cable (OPTIC) and transmitted and received through a UART port (serial port) to a terminal device (FRTU, not shown).

In addition, the data carried on the first optical wavelength is stored in a memory connected to the optical cable can be retransmitted when there is a request to the higher server.

4A and 4B are diagrams showing demo results of a distribution automation system including a high speed data transmission unit according to an embodiment of the present invention. FIG. 4A is a schematic diagram of connecting the distribution automation system of FIG. 2A in a closed loop manner. 4B is a graph showing a demonstration result up to the time when the FRTU relay is operated until a fault occurs by flowing fault power through the closed loop circuit constructed in FIG. 4A.

Referring to FIG. 4A, the power generated from the current voltage generator flows through the terminal unit FRTU, and the control signal of the terminal unit FRTU and the terminal unit FRTU through the optical modem and the high speed data transmission unit WSCU. The optical signal incorporating the distribution protection coordination signal formed therefrom flows.

When the terminal apparatus (FRTU) detects the fault power, the fault power is sensed through the communication with the left and right terminal devices, and is cut off using a breaker, so that the fault power is spread to the health section. Prevent the phenomenon.

Referring to FIG. 4B, a fault power is formed and flowed through the close loop type distribution automation system constructed in FIG. 4A to show the time required from the time of occurrence of a failure to the time of judging the failure section and according to the present invention. It takes a total of 30ms. The time required for 30ms is not limited to this and includes an error of ± 5ms.

When fault power flows to the distribution automation system, that is, when the fault occurs (fault occurrence) is measured as 0ms, it takes 20ms to determine the DSP fault and 3ms from DSP fault determination to CPU transmission.

The DSP fault determination determines whether the signal currently input from the DSP for determining a fault inside the terminal equipment FRTU is higher than the reference signal. If the CPU transmission determines that the DSP is at a high voltage, it receives the measured information. That is, it is not easy to reduce the time required for DSP fault determination and CPU transmission as arithmetic processing by a mechanical device in the terminal unit FRTU.

When the information is measured by the CPU, the measured information is transmitted to the high speed data transfer unit (WSCU), and the signals received by the high speed data transfer unit are combined and transferred back to the CPU. When the CPU determines which section is a failure section and transmits a trip command (a signal for turning off electricity), the relay (breaker) of the FRTU that received the trip command operates.

That is, the CPU transmission to the trip command after the CPU reception is not a mechanical operation but a communication. In the present invention, the time required for the high speed data transfer unit is reduced to 2 ms.

For reference, in the existing distribution automation system that transmits protection coordination information, the time required for communication processing interval from CPU transmission to trip command after CPU reception is 22ms based on the serial. This is because the existing distribution automation system uses an Ethernet signal and converts serial data received as a serial signal into UDP, which is a TCP / IP signal, and converts the converted UDP signal into an optical signal. However, in the present invention, since the serial signal is directly converted into an optical signal using a high speed data transmission unit, the time required can be greatly reduced.

Therefore, the distribution automation system of the present invention can transmit and receive a distribution protection coordination signal without implementing a separate optical cable by using a high-speed data transmission unit. It is possible to shorten the total time taken to determine and block the section, thereby preventing the occurrence of a fault in the health section.

Those skilled in the art can change or modify the described embodiments without departing from the scope of the present invention, and such changes or modifications are within the scope of the present invention. In addition, the materials of each component described herein can be readily selected and coped by a variety of materials known to those skilled in the art. In addition, those skilled in the art may omit some of the components described herein without adding to the performance or add the components to improve performance. In addition, those skilled in the art may change the order of the method steps described herein depending on the process environment or equipment. Therefore, the scope of the present invention should be determined by the appended claims and equivalents thereof, not by the embodiments described.

1 is a view showing a power cut algorithm of the underground closed loop method according to an embodiment of the present invention.

2A and 2B illustrate a WDM-based power distribution automation system according to an embodiment of the present invention.

3 is a diagram illustrating a high speed data transfer unit according to one embodiment of the present invention;

4A and 4B illustrate demo results of a distribution automation system including a high speed data transfer unit according to an embodiment of the present invention.

                <Explanation of symbols for the main parts of the drawings>

200: distribution automation system 210: high speed data transmission unit

212: serial data optical conversion module 214: WDM module

220: terminal equipment (FRTU) 230: optical modem

Claims (6)

A serial data optical conversion module for converting a protection coordination signal received in a serial signal form into an optical signal; And A WDM module for multiplexing a first optical signal received from an optical modem and a second optical signal converted by the serial data optical conversion module; High speed data transfer unit comprising a. The method of claim 1, wherein the serial data optical conversion module, A high-speed data transmission unit, comprising two independent serial data optical conversion module integrated into one to transmit protection coordination signal information to each FRTU existing on both sides of the serial data optical conversion module. In the distribution automation system for transmission control cooperation information transmission of the closed loop method, A FRTU for receiving control signals and protection coordination signal information, converting them into RS-232 form, and operating a protection coordination algorithm; An optical modem for receiving the control signal and converting the control signal into a first optical signal; And The high speed data transmission unit of claim 1, receiving the protection coordination signal information, converting the signal into a second optical signal, multiplexing the first optical signal and the second optical signal, and transmitting the multiplexed optical signals to a higher server through a single optical cable; WDM-based distribution automation system for transmission protection cooperation information transmission comprising a. The method of claim 3, wherein the FRTU is WDM-based distribution automation system further comprises two RS-232 communication ports for communicating with the FRTU existing on both sides of the FRTU. The system of claim 3, wherein the wavelengths of the first optical signal and the second optical signal are different from each other. The system of claim 5, wherein the wavelength of the first optical signal is 1310 nm and the wavelength of the second optical signal is 1550 nm.

Images