CN108712349A - Site protection unification of three nets is total to port transmitting method and site protection system - Google Patents

Abstract

It is total to port transmitting method the present invention relates to site protection unification of three nets and site protects system; when when some time interval has sent a certain frame SV messages; the type of the following data to be sent of detection; if GOOSE message or MMS messages; the data are then sent before the arrival of next time interval, and send next frame SV messages in next time interval；Whether if SV messages, detecting in corresponding handset has GOOSE message or MMS messages to need to send, if so, then sending the GOOSE message or MMS messages before the arrival of next time interval.When total mouth data are sent, SV messages are sent in regular intervals, to send a GOOSE message or MMS messages between the transmission of SV messages twice, solve the problems, such as that above-mentioned three kinds of messages are total to port transmission.The processing of this method software is simple, reliability is high, is easily achieved, and improves the reliability of site protective device.

Description

In-situ protection triple-network-in-one common-port transmission method and in-situ protection system

technical field

The invention relates to an in-situ protection three-network-in-one common-port transmission method and an in-situ protection system.

Background technique

In 2015, the State Grid Corporation of China put forward specific guidance on the new mode of secondary protection and control of smart substations, and proposed a miniaturized, on-site, unprotected installation mode for relay protection devices with voltage levels of 220kV and below. The in-situ miniaturized device can reduce the intermediate links of data transmission and further improve the speed and reliability of relay protection; the in-situ device realizes plug and play based on standard connectors to improve operation and maintenance efficiency, and cancels the protective screen The cabinet reduces the construction area and reduces the construction cost of the whole station. In 2016, the establishment of relevant standards and interface specifications, product development, and professional testing of in-situ line protection devices for smart substations has been completed, and projects have been carried out in several provinces with typical operating environments such as Heilongjiang, Xinjiang, Zhejiang, and Sichuan. Pilot application. In the past year of pilot operation, it has experienced many power grid failure tests, and the local line protection action is correct. At present, in-situ protection only completes the development and pilot operation of single-bay line protection devices. Due to the different implementation modes for cross-bay busbar protection and transformer protection, higher requirements are proposed for the hardware structure, communication performance, and data processing capabilities of the devices. The existing in-situ line protection hardware cannot meet the above requirements.

The "State Grid Corporation of China's Notice on Printing and Distributing the Outline of the Development of the Company's Relay Protection Technology" pointed out that in-situ protection is the key direction for the development of relay protection technology. Since 2017, the National Investigation Center has organized various network provincial companies and equipment manufacturers to carry out discussions on on-site busbar protection and on-site transformer protection technology solutions for the research and development of cross-interval on-site busbar protection and transformer protection equipment. In-situ protection of the whole site pilot operation provides a basis.

In the local protection device, the SV message, GOOSE message and MMS message are transmitted through the same Ethernet port. Therefore, in order to ensure the reliability of the local protection action and the cross-interval local bus protection operation, the It is necessary to firstly solve the problem of co-port transmission of SV messages, GOOSE messages and MMS messages. Existing data transmission methods are generally only for one type of message or two types of messages, and there is no transmission method for simultaneously using the same network port to transmit SV messages, GOOSE messages and MMS messages. The data transmission problem is the basis of in-situ protection. If this problem cannot be solved, the reliability of in-situ protection cannot be guaranteed, let alone cross-interval in-situ bus protection.

Contents of the invention

The purpose of the present invention is to provide a local protection three-network-in-one common-port transmission method to solve the problem of common-port transmission of SV messages, GOOSE messages and MMS messages. The invention also provides an in-situ protection system.

To achieve the above object, the present invention includes the following technical solutions.

An in-situ protection three-network-in-one common port transmission method, when a certain frame of SV message is sent at a certain time interval, the type of data to be sent next is detected,

If the data to be sent is a GOOSE message or an MMS message, the data is sent before the next time interval arrives, and the next frame SV message is sent at the next time interval;

If the data to be sent is an SV message, then set the data to be sent as the SV message to be sent at the next time interval, and detect whether there is a GOOSE message in the corresponding localized protection sub-machine GOOSE message or MMS message needs to be sent, if there is, then send the GOOSE message or MMS message that needs to be sent in the in-situ protection device before the arrival of the next time interval.

Based on the characteristics of the SV message, GOOSE message and MMS message in the in-situ protection of the three-network integration common interface output characteristics, this in-situ protection three-network integration common interface transmission method is proposed, and the SV message is at a certain time interval To send, when a certain frame of SV message is sent at a certain time interval, detect the type of data to be sent next, if it is a GOOSE message or MMS message, then send the data before the arrival of the next time interval, Then send the next frame of SV message in the next time interval, that is to say, a GOOSE message or MMS message is sent between two time intervals, that is, a GOOSE message needs to be sent between two SV messages. text or MMS message; if it is an SV message, control the SV message data to be sent to be sent when the next time interval arrives, and detect whether there is a GOOSE message or MMS message in the sub-machine to be sent, if Yes, just before the arrival of the next time interval, that is, before the SV message to be sent in the next time interval is sent, the GOOSE message or MMS message in the sub-machine is sent. Therefore, when the common port data is sent, SV messages are sent at fixed time intervals, and a GOOSE message or MMS message is sent between two SV messages, which solves the problem of SV messages, GOOSE messages and MMS messages. The problem of common mouth transmission. The method has the advantages of simple software processing, high reliability and easy realization, improves the reliability of the local protection device, and is suitable for the protection of local lines, transformers, busbars and the like.

Further, when sending a GOOSE message or an MMS message, the sending priority of the GOOSE message is higher than that of the MMS message.

Further, if the SV message to be sent has at least two frames, only one frame of data is sent in each time interval; if the GOOSE message or MMS message to be sent has at least two frames, only one frame of data is sent between the two time intervals. Send a frame of data.

An in-situ protection system includes at least two in-situ protection sub-machines, and the in-situ protection sub-machines interact through communication lines. For any in-situ protection sub-machine, when at a certain time interval After sending a certain frame of SV message, detect the type of data to be sent next,

If the data to be sent is a GOOSE message or an MMS message, the data is sent before the next time interval arrives, and the next frame SV message is sent at the next time interval;

If the data to be sent is an SV message, then set the data to be sent as the SV message to be sent at the next time interval, and detect whether there is a GOOSE message in the corresponding localized protection sub-machine GOOSE message or MMS message needs to be sent, if there is, then send the GOOSE message or MMS message that needs to be sent in the in-situ protection device before the arrival of the next time interval.

Further, the on-site protection sub-machine includes a control module and a communication controller. Two sending buffer areas are set in the on-site protection sub-machine, which are respectively the sending buffer area of the control module and the sending buffer area of the communication controller. Write and send commands to the communication controller to realize data sending.

Further, when a certain frame of SV message is sent at a certain time interval, the control module copies the data to be sent in the sending buffer of the control module to the sending buffer of the communication controller, and then detects the data to be sent The type of data to be sent. If the data to be sent is a GOOSE message or an MMS message, write a send command to the communication controller.

Further, if there are GOOSE messages or MMS messages to be sent in the in-situ protection sub-machine, the control module sends the GOOSE messages or MMS messages to be sent to the control module sending buffer, and then copies them to The communication controller sends data in the sending buffer.

Further, when sending a GOOSE message or an MMS message, the sending priority of the GOOSE message is higher than that of the MMS message.

Further, if the SV message to be sent has at least two frames, only one frame of data is sent in each time interval; if the GOOSE message or MMS message to be sent has at least two frames, only one frame of data is sent between the two time intervals. Send a frame of data.

Further, there is a message receiving buffer in the local protection sub-machine, and the control module detects the reception of the communication controller in real time, and when a GOOSE message or MMS message is received, it is read into the message receiving buffer.

Description of drawings

Figure 1 is a schematic diagram of a distributed arrangement implementation of in-situ protection;

Fig. 2 is a schematic diagram of a specific processing flow of the localized protection three-network-in-one common-port transmission method.

Detailed ways

Embodiment of In-situ Protection Three-Network-in-One Common Port Transmission Method

This embodiment provides an on-site protection three-network-in-one common port transmission method, which is suitable for on-site protection devices arranged close to primary equipment. As a specific implementation, the method is suitable for on-site The protection device adopts direct cable sampling and direct cable tripping, and uses standard connectors for external input and output. Wherein, the SV message is sent at a fixed period, that is, at a fixed time interval. In this embodiment, the sending time interval of the SV message is set to 250 μs, that is, the sampling rate for sending the SV message is fixed at 4 kHz.

At a certain time interval, a certain frame of SV message is sent, and when the frame of SV message is sent at this time interval, the type of data to be sent next is detected:

If the data to be sent is a GOOSE message or an MMS message, the data is sent before the arrival of the next time interval, and the next frame of SV message is sent in the next time interval. That is to say, between two frames of SV messages, a GOOSE message or MMS message should be sent fixedly once. Further, when sending a GOOSE message or MMS message, the sending priority of the GOOSE message is higher than that of the MMS message. The sending priority of the GOOSE message, that is, when the GOOSE message or the MMS message exists at the same time, the GOOSE message is sent first. Moreover, if there are at least two frames of SV messages to be sent, then, when multiple frames of messages exist at the same time, no matter how many frames there are, only one frame of data can be sent in each time interval, and only the first frame of messages will be sent in this time interval , send the second frame message at the next time interval, and so on. If there are at least two frames of GOOSE messages or MMS messages to be sent, only one frame of data is sent between two time intervals, that is, between two frames of SV messages, that is, when multiple frames of messages exist at the same time Only the first frame message is sent, and the second frame message is sent next time, and only one frame of GOOSE message or MMS message is allowed to be sent each time.

If the data to be sent is an SV message, set the data to be sent as the SV message to be sent in the next time interval, that is, the data to be sent will be sent in the next time interval. In order to send a fixed GOOSE message or MMS message between two frames of SV messages, after judging that the data to be sent is an SV message, check whether there is a GOOSE message in the corresponding local protection sub-machine Or MMS message needs to be sent, actively check whether there is a GOOSE message or MMS message to be sent in the sub-machine, if there is, before the arrival of the next time interval, that is, the SV message to be sent in the next time interval above Before sending, send the GOOSE message or MMS message that needs to be sent in the sub-machine. Therefore, under normal circumstances, if it is not satisfied that a GOOSE message or an MMS message is to be sent between two frames of SV messages, then the sub-machine will actively search whether there is a GOOSE message or an MMS message that needs to be sent. And before sending the next frame of SV message, the GOOSE message or MMS message to be sent is sent out, so that a GOOSE message or MMS message needs to be sent between two frames of SV messages. As in the previous paragraph, when sending GOOSE messages or MMS messages, the sending priority of GOOSE messages is higher than that of MMS messages, that is, GOOSE messages are sent first when GOOSE messages or MMS messages exist at the same time . Moreover, if there are at least two frames of SV messages to be sent, then, when multiple frames of messages exist at the same time, no matter how many frames there are, only one frame of data can be sent in each time interval, and only the first frame of messages will be sent in this time interval , send the second frame message at the next time interval, and so on. If there are at least two frames of GOOSE messages or MMS messages to be sent, only one frame of data is sent between two time intervals, that is, between two frames of SV messages, that is, when multiple frames of messages exist at the same time Only the first frame message is sent, and the second frame message is sent next time, and only one frame of GOOSE message or MMS message is allowed to be sent each time.

When data is sent, it is sent according to the above-mentioned sending strategy, however, data reception may not be restricted.

Therefore, this transmission method is suitable for in-situ line protection, transformer protection, busbar protection, etc. with the output function of SV, GOOSE, and MMS three-in-one common port. This transmission method is suitable for in-situ protection devices arranged close to the primary equipment. External input and output use standard connectors, and SV messages, GOOSE messages and MMS messages are transmitted using the same Ethernet port. Real-time control of the Ethernet controller through the FPGA, sending SV messages in a fixed period, fixedly processing a frame of GOOSE messages or MMS messages between two frames of SV messages, and giving priority to GOOSE messages, which solves the problem of SV messages , GOOSE message and MMS message co-port transmission problem. The method has the advantages of simple software processing, high reliability and easy realization, and improves the reliability of the in-situ protection device.

In situ protection system embodiment

This embodiment provides an in-situ protection system, which includes at least two in-situ protection sub-machines, and the in-situ protection sub-machines interact through communication lines. In this embodiment, the on-site protection system takes on-site transformer protection as an example, and FIG. 1 is a schematic diagram of a specific distributed layout of on-site transformer protection. The system includes the primary switch yard on the high voltage side of the main transformer, the primary switch yard on the medium voltage side of the main transformer and the switch cabinet on the low voltage side of the main transformer. The main transformer is equipped with protection sub-machines according to the side, so the protection sub-machine configured on the high-voltage side of the main transformer is the main transformer high-voltage side sub-machine, the protection sub-machine configured on the main transformer medium-voltage side is the main transformer The protection sub-unit configured on the main transformer low-voltage side sub-unit, the high-voltage side, medium-voltage side and low-voltage side sub-units respectively collect the analog and switch information of the main transformer side, and form a ring network with other sub-units through Gigabit optical fiber. The analog and switch information on the other side is obtained through the gigabit optical fiber ring network, and each sub-unit independently completes all protection functions, and the SV, GOOSE, and MMS information of each sub-unit is connected to the protection network. Wherein, the SV message is sent at a fixed period, that is, at a fixed time interval. In this embodiment, the sending time interval of the SV message is set to 250 μs, that is, the sampling rate for sending the SV message is fixed at 4 kHz.

Therefore, the hardware structure of the in-situ protection system can adopt a conventional system structure, and the protection point of this application lies in the three-network-in-one common-port transmission method in the system, and this method can be used as a functional module, placed in each in-situ protection In the slave machine (that is, the in-situ protection device), this functional module is always in the input state.

Since each sub-unit can receive the relevant information of other sub-units, the following uses any sub-unit as an example to illustrate the data transmission strategy. The sub-unit can be any one of the high-voltage side, medium-voltage side and low-voltage side sub-units .

The sub-machine includes a control module, the control module is FPGA as an example, and, in order to realize the communication control with Ethernet, the sub-machine also includes a communication controller, taking the Ethernet controller as an example. Realize data transmission under the control of FPGA and Ethernet controller.

The three-network-in-one common port transmission method is executed by the FPGA and the Ethernet controller in the form of a software program. In order to divide the functions according to the specific transmission process of the data, the CPU interrupt task and the FPGA transmission task are set in the sub-machine. These two tasks realize data transfer. Sending, of course, there is also an FPGA receiving task in the sub-machine to realize data reception. In addition, there are two sending buffer areas in the sub-machine, which are respectively the sending buffer area of the control module and the sending buffer area of the communication controller. Then, the sending buffer area of the control module is specifically the FPGA sending buffer area, and the sending buffer area of the communication controller is the Ethernet sending buffer area. The network controller sends the buffer. Correspondingly, an FPGA message receiving buffer area is set in the sub-machine.

The FPGA sending task is executed at a certain time interval and triggers the CPU interrupt task. The two tasks cooperate to complete the data sending, while the FPGA receiving task is always executed. That is to say, the FPGA receiving task detects the reception of the Ethernet controller in real time. When a text or MMS message is received, it is read into the FPGA message receiving buffer.

The following focuses on the specific description of the message data transmission.

The FPGA sending task regularly writes sending commands to the Ethernet controller according to a certain time interval to send SV messages. The FPGA sending task writes sending commands to the Ethernet controller at a certain time interval, and sends a frame of SV message. The FPGA sending task monitors the sending of the Ethernet controller in real time, and immediately copies the data to be sent in the FPGA sending buffer to the sending buffer of the Ethernet controller after the SV message of this frame is sent.

The FPGA sending task checks the type of data to be sent. Since the data in the FPGA sending buffer is the same as the data in the Ethernet controller sending buffer, the FPGA sending task detects the type of data in the FPGA sending buffer to see if Is GOOSE message or MMS message:

If the data to be sent is a GOOSE message or MMS message, write a send command to the Ethernet controller, send the GOOSE message or MMS message before the arrival of the next time interval, and send the next frame SV at the next time interval message. That is to say, between two frames of SV messages, a GOOSE message or MMS message should be sent to the FPGA sending buffer once fixedly, so as to realize the sending of the GOOSE message or MMS message. Further, when sending a GOOSE message or an MMS message, the sending priority of the GOOSE message is higher than that of the MMS message, that is, when the GOOSE message or the MMS message exists at the same time, the GOOSE message is sent first. Moreover, if there are at least two frames of SV messages to be sent, then, when multiple frames of messages exist at the same time, no matter how many frames there are, only one frame of data can be sent in each time interval, and only the first frame of messages will be sent in this time interval , send the second frame message at the next time interval, and so on. If there are at least two frames of GOOSE messages or MMS messages to be sent, only one frame of data is sent between two time intervals, that is, between two frames of SV messages, that is, when multiple frames of messages exist at the same time Only the first frame message is sent, and the second frame message is sent next time, and only one frame of GOOSE message or MMS message is allowed to be sent each time.

If the data to be sent is an SV message, then the SV message is identified as the SV message to be sent at the next time interval, and it is sent when the next time interval arrives, and the sending command is no longer written. And, CPU interrupt task checks whether there is GOOSE message or MMS message in the sub-machine and needs to send, namely actively searches whether there is GOOSE message or MMS message that needs to be sent in the sub-machine, if there is, sends GOOSE message or MMS message The message is sent to the FPGA sending buffer, and before the next time interval arrives, that is, before the SV message to be sent in the next time interval, the GOOSE message or MMS message that needs to be sent in the slave is sent. Therefore, under normal circumstances, if it is not satisfied that a GOOSE message or an MMS message is to be sent between two frames of SV messages, then the sub-machine will actively search whether there is a GOOSE message or an MMS message that needs to be sent. And before sending the next frame of SV message, the GOOSE message or MMS message to be sent is sent out, so that a GOOSE message or MMS message needs to be sent between two frames of SV messages. As in the previous paragraph, when sending GOOSE messages or MMS messages, the sending priority of GOOSE messages is higher than that of MMS messages, that is, GOOSE messages are sent first when GOOSE messages or MMS messages exist at the same time . Moreover, if there are at least two frames of SV messages to be sent, then, when multiple frames of messages exist at the same time, no matter how many frames there are, only one frame of data can be sent in each time interval, and only the first frame of messages will be sent in this time interval , send the second frame message at the next time interval, and so on. If there are at least two frames of GOOSE messages or MMS messages to be sent, only one frame of data is sent between two time intervals, that is, between two frames of SV messages, that is, when multiple frames of messages exist at the same time Only the first frame message is sent, and the second frame message is sent next time, and only one frame of GOOSE message or MMS message is allowed to be sent each time.

The CPU interrupt task sends the SV message to the FPGA send buffer, where the SV message is the data to be sent in the next time interval.

In addition, the CPU interrupt task also checks the FPGA message receiving buffer area, and reads and processes any messages.

Fig. 2 shows a specific processing flow of the in-situ protection three-network-in-one common-port transmission method. Of course, this is only a specific implementation process, and the present invention is not limited to this specific process.

Specific embodiments have been given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above-mentioned basic scheme. For those of ordinary skill in the art, according to the teaching of the present invention, it does not need to spend creative labor to design various deformation models, formulas, and parameters. Changes, modifications, substitutions and variations to the implementations without departing from the principle and spirit of the present invention still fall within the protection scope of the present invention.

Claims (10)

1. A common port transmission method for in-situ protection of three networks, is characterized in that, when a certain frame SV message is sent at a certain time interval, the type of data to be sent next is detected, If the data to be sent is a GOOSE message or an MMS message, the data is sent before the next time interval arrives, and the next frame SV message is sent at the next time interval; If the data to be sent is an SV message, then set the data to be sent as the SV message to be sent at the next time interval, and detect whether there is a GOOSE message in the corresponding localized protection sub-machine GOOSE message or MMS message needs to be sent, if there is, then send the GOOSE message or MMS message that needs to be sent in the in-situ protection device before the arrival of the next time interval. 2. the in-situ protection three-in-one common port transmission method according to claim 1, is characterized in that, when sending GOOSE message or MMS message, the sending priority of GOOSE message is higher than the sending of MMS message priority. 3. the in-situ protection three-network-in-one common port transmission method according to claim 2 is characterized in that, if the SV message to be sent has at least two frames, then only one frame of data is sent in each time interval; If the sent GOOSE message or MMS message has at least two frames, only one frame of data is sent between two time intervals. 4. An in-situ protection system, comprising at least two in-situ protection sub-machines, each in-situ protection sub-machine interacts through a communication line, and it is characterized in that, for any one in-situ protection sub-machine, When a certain frame of SV message is sent at a certain time interval, the type of data to be sent next is detected, If the data to be sent is a GOOSE message or an MMS message, the data is sent before the next time interval arrives, and the next frame SV message is sent at the next time interval; If the data to be sent is an SV message, then set the data to be sent as the SV message to be sent at the next time interval, and detect whether there is a GOOSE message in the corresponding localized protection sub-machine GOOSE message or MMS message needs to be sent, if there is, then send the GOOSE message or MMS message that needs to be sent in the in-situ protection device before the arrival of the next time interval. 5. The in-situ protection system according to claim 4, wherein the in-situ protection sub-machine comprises a control module and a communication controller, and two sending buffer areas are arranged in the in-situ protection sub-machine, respectively The control module sends the buffer area and the communication controller sends the buffer area, and the control module writes the sending command to the communication controller to realize the data sending. 6. The in-situ protection system according to claim 5, characterized in that, when a certain frame of SV message is sent at a certain time interval, the control module will control the module to send the to-be-sent SV message in the buffer area The data is copied to the sending buffer of the communication controller, and then the type of the data to be sent is detected, and if the data to be sent is a GOOSE message or an MMS message, a sending command is written to the communication controller. 7. The in-situ protection system according to claim 5 or 6, wherein, if there is a GOOSE message or an MMS message to be sent in the in-situ protection sub-machine, the control module will send the GOOSE message that needs to be sent. Send the text or MMS message to the sending buffer of the control module, and then copy it to the sending buffer of the communication controller for data transmission. 8. The in-situ protection system according to claim 4 or 5 or 6, characterized in that, when sending a GOOSE message or an MMS message, the sending priority of the GOOSE message is higher than the sending priority of the MMS message . 9. The in-situ protection system according to claim 8, characterized in that, if the SV message to be sent has at least two frames, then only one frame of data is sent in each time interval; if the GOOSE message to be sent or If the MMS message has at least two frames, only one frame of data is sent between two time intervals. 10. The in-situ protection system according to claim 5 or 6, characterized in that there is a message receiving buffer in the in-situ protection sub-machine, and the control module detects the reception of the communication controller in real time, when there is a GOOSE message Or when the MMS message is received, it is read into the message receiving buffer.