CN103533066A - Method for receiving, transmitting and synchronizing fiber longitudinal differential data through process level device - Google Patents

Abstract

The invention relates to a method for realizing transmission, reception and synchronization of optical fiber channel data on process layer equipment, and belongs to the technical field of power systems. The process layer equipment also includes the function of merging unit and intelligent terminal, which can realize the switch value collection of a line interval, send it to the process layer network through GOOSE, receive the GOOSE command on the process layer network, and realize the circuit breaker of a line interval, Control of the knife switch; receive the digital or analog information of the transformer, receive the data of the optical fiber channel, synchronize with the data on the local side and send it to the process layer network through the SV sampling value; realize the switch between the local side and the opposite side inside the device The exchange and sharing of mass data. The present invention can be used to integrate the functions of the intelligent terminal, the merging unit and the optical fiber channel, solve the problem of realizing the optical fiber differential in the intelligent substation, reduce the number of process layer devices, reduce the size of on-site installation, simplify the engineering design, and implement it inside the equipment The synchronization of the data on the local side and the opposite side is simple and reliable.

Description

A process layer device realizes optical fiber longitudinal difference data sending and receiving and synchronization method

technical field

The invention belongs to the technical field of electric power systems, and in particular relates to a method for a process layer device to realize transmission and reception and synchronization of optical fiber longitudinal difference data, and relates to a process layer device of an intelligent substation, in particular to a process layer device with the function of transmitting and receiving a longitudinal optical fiber channel.

Background technique

Smart substations are a development direction of substations in smart grids. Currently, smart substations mostly adopt a typical three-layer structure: process layer, interval layer, and station control layer. As shown in Figure 1, the devices in these three layers are The functions are clearly defined. The equipment at the process layer is mainly the merging unit and the intelligent terminal. The merging unit completes the acquisition of analog quantities, and the intelligent terminal completes the acquisition of switching quantities and the execution of control quantities.

At present, the merging unit and the intelligent terminal device are combined into boxes separately, and each is independently a single-function device. In engineering practice, this method has highlighted many problems, such as difficulty in information sharing, duplication of hardware settings, large device heat generation, large footprint, and heavy debugging workload. These problems restrict the development of this smart substation. To solve these problems, it is necessary to use new ideas to develop process-level equipment.

In traditional substations, the transmission and reception function of the optical fiber channel of the line longitudinal differential protection and the data collection function of the local side are all realized by the protection device. The protection needs to synchronize the data of the local side and the data of the opposite side to realize differential protection. In the smart substation, the data collection function of the protection side is completed by the merging unit, and sent to the protection device through the process layer network. The sending and receiving function of the channel is completed on the protection device at the bay layer, which brings some problems: first, the protection device must have the ability to synchronize the data on both sides, that is, to combine the SV data sent by the combiner received by the local side with the The opposite-side data received by the fiber channel is synchronized, so that the protection device needs to have an accurate time synchronization function to ensure the synchronization accuracy, and corresponding hardware interfaces need to be added, while increasing the calculation load of the protection device; then, in this mode, Since there are two time bases, it is necessary to ensure that the merging unit and the protection device are in a synchronized state at the same time before the protection can be opened. When any device loses synchronization, the protection must be blocked to prevent the protection from malfunctioning due to data out of synchronization.

Contents of the invention

Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a process layer device to realize the transmission and reception and synchronization of optical fiber longitudinal difference data. It is difficult to realize the synchronization of data on both sides of the line, and at the same time, it provides an implementation method of line differential protection in smart substations.

The present invention is achieved through the following technical solutions:

A process layer device realizes the optical fiber longitudinal difference data sending and receiving and synchronization method, which is to add a fiber optic longitudinal difference data sending and receiving hardware interface on the process layer device, and can complete the sending and receiving function of the fiber longitudinal difference data through a dedicated fiber channel, and the correlation of the fiber channel The configuration settings are saved on the interval layer device and downloaded to the process layer device through the GOOSE message.

The process layer equipment has the functions of intelligent terminal and combiner, and can obtain the switching value information and analog value information of the local interval inside the device, and can also obtain the protection information of the local side from the process layer network.

After the process layer device obtains the analog data of the opposite side, it synchronizes with the data of the local side, and according to the IEC 61850-9 standard, the sampling data of the local side and the opposite side are synchronized and packaged into SMV Ethernet data for transmission. To the process layer network for sharing by other devices on the network, and the obtained switching value information can be sent to the process layer network through GOOSE.

The process layer equipment can obtain the protection information of the local side through the process layer network, collect the switching value information and analog value information of the current interval, and send the data to the opposite side substation through the optical fiber differential data transmission interface after being packaged.

The process layer device implements the functions of merging unit, intelligent terminal and fiber channel data transmission and reception in one device, and the three functional modules share data through the internal shared memory mode, and have a unique physical interface with the process layer device.

The process layer equipment includes a merging unit module, an optical fiber transceiver module, an intelligent terminal module, a switch data storage module and a GOOSE transceiver module.

The optical fiber transceiver module can obtain the analog data of this side, switching value information, protection information and fiber channel configuration information; the merging unit module can obtain the analog data of this side and the analog data of the opposite side received by the fiber channel. Send to the process layer network through the SV; the intelligent terminal module is used to complete the collection of the switch value and the execution of the control value; the switch value data storage module is used to store the data imported by the optical fiber transceiver module, the intelligent terminal module and the GOOSE transceiver module ; The GOOSE transceiver module manages the opposite-side switch information received by the optical transceiver module and the switch information of the intelligent terminal module in a unified manner, and puts the received GOOSE information into the switch data area for the intelligent terminal module and optical fiber transceiver module Obtain.

The present invention has the following advantages and beneficial effects:

In the present invention, since the optical fiber longitudinal difference data sending and receiving hardware interface is added on the process layer equipment, the sending and receiving function of the fiber longitudinal difference data can be completed through the dedicated fiber channel. Passed to the process layer equipment. Therefore, it can be used to integrate the functions of intelligent terminals, merging units and fiber channels, solve the problem of realizing optical fiber differential in smart substations, reduce the number of process layer devices, reduce the size of on-site installation, simplify engineering design, and implement it inside the equipment The synchronization of the data on the local side and the opposite side is simple and reliable.

Description of drawings

Figure 1 is a schematic diagram of a typical structure of a network system in an existing smart substation;

Fig. 2 is the engineering application schematic diagram of process layer equipment of the present invention;

Fig. 3 is a schematic diagram of the principle of an embodiment of the present invention;

Fig. 4 is a diagram of transmission and reception and synchronization of optical fiber longitudinal difference data in the present invention.

Detailed ways

The present invention is a process layer device to realize the transmission and reception and synchronization of optical fiber longitudinal difference data, wherein a hardware interface for transmitting and receiving optical fiber longitudinal difference data is added to the process layer device, and the function of transmitting and receiving optical fiber longitudinal difference data can be completed through a dedicated fiber channel. The relevant configuration settings are saved on the bay layer device and downloaded to the process layer device through the GOOSE message.

The process layer device has the function of intelligent terminal and combiner, which can obtain the switching value information and analog value information of the local interval inside the device, and can also obtain the protection information of the local side from the process layer network.

After the process layer device obtains the analog data of the opposite side, it synchronizes with the data of the local side, and according to the IEC 61850-9 standard, the sampling data of the local side and the opposite side are synchronized and packaged into SMV Ethernet data and sent to the process layer The network is shared by other devices on the network, and the obtained switching value information can be sent to the process layer network through GOOSE.

The process layer device can obtain the protection information of this side through the process layer network, collect the switching value information and analog value information of this interval, and send the data to the opposite side substation through the optical fiber differential data transmission interface after packaging.

The specific embodiment of the present invention is shown in Fig. 2-4, the device hardware of the present invention adopts the addition of optical fiber vertical difference data sending and receiving hardware interfaces on the process layer equipment equipped with intelligent terminals and merging units, which can realize the sharing of data in this interval to the greatest extent. Ensure that the sent data is in one clock domain, reducing the impact of out-of-synchronization on protection. In the hardware structure, the CPU plug-in realizes logical calculation functions such as intelligent terminals and merging units, and the optical fiber interface plug-in realizes the encoding and decoding function of optical fiber data. The hardware interface of optical fiber differential data transmission and reception can realize the optical fiber data transmission and reception function through a dedicated optical fiber channel or a digital interface of a multiplexed PDH or SDH system.

The process layer device with longitudinal fiber channel transceiver function implements the functions of merging unit, intelligent terminal and fiber channel data transceiver in one device. The three functional modules share data through the internal shared memory mode. Its structure is shown in Figure 3. This process layer device is suitable for smart substations that adopt the IEC61850 standard. Process layer equipment includes merging unit module, optical fiber transceiver module, intelligent terminal module, switch data storage module and GOOSE transceiver module. The optical fiber transceiver module can obtain the analog data of this side, switching value information, protection information and fiber channel configuration information; the merging unit module can obtain the analog data of this side and the analog data of the opposite side received by the fiber channel. Send to the process layer network through the SV; the intelligent terminal module is used to complete the collection of the switch value and the execution of the control value; the switch value data storage module is used to store the data imported by the optical fiber transceiver module, the intelligent terminal module and the GOOSE transceiver module ; The GOOSE transceiver module manages the opposite-side switch information received by the optical transceiver module and the switch information of the intelligent terminal module in a unified manner, and puts the received GOOSE information into the switch data area for the intelligent terminal module and optical fiber transceiver module Obtain.

The merging unit of the process layer equipment, the intelligent terminal and the fiber channel function module exchange data through the internal mechanism, and have a unique physical interface with the process layer network.

Because the process layer equipment is installed locally, there is no friendly man-machine interface, and it does not have the function of setting the fixed value locally, and the fixed value of the fiber channel is a part of the protection fixed value, while the protection device at the bay layer has the fixed value function. It is determined that the fixed value of the fiber channel needs to be set on the protection device and used on the process layer device, which requires a mechanism for down-transmitting the protection setting value to the process layer device. The present invention transmits the fixed value of protection to the process layer device in the way of GOOSE transmission. Before the process layer device receives the fixed value of the protection download, the fiber channel function is in a waiting state, waiting to receive the downloaded fixed value, Re-initialize the fiber channel and enter the working state. The protection device has a strong advantage in the setting of the fixed value, so the fixed value setting function of the relevant setting items of the fiber channel is realized in the protection device, and is transmitted to the process layer device through the GOOSE message. Before setting the value, run with the default setting.

The engineering application of process layer equipment in smart substation is shown in Figure 2. The process layer device integrates the functions of the intelligent terminal, the merging unit, and the fiber channel. After receiving the opposite side data of the fiber channel, it unpacks the received data and extracts the switching value and analog value. After unpacking, the switching value is sent to the process layer network through GOOSE, and the analog value is resampled according to the corrected time scale after the sampling deviation calculation, and the synchronization of the analog value is completed. After synchronization, it is packaged as an SV message and sent to the process layer network. For protective device use. Receive the GOOSE command on the process layer network to realize the control of an interval circuit breaker and knife switch; receive the digital or analog information of the transformer, and send it to the process layer network through the SV after synchronization; receive the data of the optical fiber channel After synchronization, it is sent to the process layer network through the SV; the analog data on the local side is transmitted to the opposite end through the fiber channel. The process layer equipment collects the analog information or digital information of the electronic transformer, and after synchronizing with the timing equipment of the substation system, according to the IEC61850-9 standard, the multi-channel sampling information is packaged into SMV Ethernet data and sent for sharing by other equipment on the network . The process layer equipment supports GOOSE sending and receiving services, and has the function of line longitudinal fiber channel reception. It can receive real-time analog data, protection and position information on the opposite side of the line through the fiber channel. The received analog data is synchronized with the local side according to IEC61850-9 The standard package is sent to the network, and the protection and location information is sent to the line protection on the local side through the GOOSE message. At the same time, it can receive the GOOSE message from other devices to realize the intelligent operation control of the primary equipment. The process layer device resamples the analog data on the local side according to the frequency required for protection, and then puts it into the buffer zone. At the same time, it obtains the switching value information on the local side, packs it and sends it to the opposite side through the optical fiber channel.

Claims (7)

1. A kind of process layer device realizes the method for sending and receiving and synchronizing optical fiber longitudinal difference data, it is characterized in that: on the process layer equipment, add the optical fiber longitudinal difference data sending and receiving hardware interface, can complete the sending and receiving function of optical fiber longitudinal difference data by special-purpose optical fiber channel, The relevant configuration values of the fiber channel are saved on the bay layer device, and are downloaded to the process layer device through the GOOSE message. 2. according to the described a kind of process layer device of claim 1, realize the method for sending and receiving and synchronizing optical fiber vertical difference data, it is characterized in that: described process layer device has intelligent terminal and combiner function, can obtain this interval inside the device The switch value information, analog value information, and the protection information of the local side can also be obtained from the process layer network. 3. A kind of process layer device according to claim 1 realizes the method for sending and receiving and synchronizing optical fiber vertical difference data, it is characterized in that: after described process layer device obtains the analog quantity data of opposite side, carry out with this side data Synchronization, and according to the IEC 61850-9 standard, the sampling data of the local side and the opposite side are synchronized and then packaged into SMV Ethernet data and sent to the process layer network for sharing by other devices on the network. At the same time, the obtained switch information can be obtained through GOOSE Upload to the process layer network. 4. A kind of process layer device according to claim 1 realizes the method for sending and receiving and synchronizing optical fiber vertical difference data, it is characterized in that: described process layer equipment can obtain this side protection information through process layer network, collect the switch of this interval Quantitative information and analog quantity information, the data is packaged and sent to the opposite substation through the optical fiber differential data transmission interface. 5. A kind of process layer device according to claim 1 realizes the method for sending and receiving and synchronizing optical fiber vertical difference data, it is characterized in that: described process layer device realizes merging unit, intelligent terminal and fiber channel data sending and receiving functions in one device , the three functional modules share data through the internal shared memory mode, and the physical interface with the process layer device is unique. 6. A kind of process layer device according to claim 1 realizes the method for sending and receiving and synchronizing optical fiber vertical difference data, it is characterized in that: described process layer equipment includes merging unit module, optical fiber transceiver module, intelligent terminal module, switch quantity Data storage module and GOOSE transceiver module. 7. A process layer device according to claim 6 realizes a method for sending and receiving and synchronizing optical fiber longitudinal difference data, characterized in that: the optical fiber transceiver module can obtain analog data, switch information, protection information and optical fiber Channel configuration information; the merging unit module can obtain the analog data of the local side and the analog data of the opposite side received by the fiber channel, and send them to the process layer network through the SV after synchronization; the intelligent terminal module is used to complete the collection and processing of the switching data of the local side Execution of the control quantity; the switching value data storage module is used to store the incoming data from the optical fiber transceiver module, intelligent terminal module and GOOSE transceiver module; the GOOSE transceiver module uniformly manages the opposite side switching value information received by the optical fiber transceiver module and the intelligent terminal module The switching value information of the local side, and put the received GOOSE information into the switching value data area for the intelligent terminal module and optical fiber transceiver module to obtain.

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