CN111711268B - Interval communication system for intelligent substation determining time delay - Google Patents
Interval communication system for intelligent substation determining time delay Download PDFInfo
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- CN111711268B CN111711268B CN202010472798.5A CN202010472798A CN111711268B CN 111711268 B CN111711268 B CN 111711268B CN 202010472798 A CN202010472798 A CN 202010472798A CN 111711268 B CN111711268 B CN 111711268B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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Abstract
The invention discloses an intelligent substation inter-bay communication system for determining time delay, which is applied to inter-bay equipment communication of an intelligent substation. The communication system comprises a merging unit, an intelligent terminal, a protection device, a measurement and control device and an interval switch, and all devices are connected with the interval switch through the Ethernet to form a local area network to realize communication among the devices. And the equipment in the local area network sends or receives network data according to the preset gating time slot so as to realize the effect of determining the transmission delay of the key data. The advantages are that: the reliability of the equipment is improved; the delay certainty of the transmission of the key data in the network can be realized; the device can be prevented from receiving related data in an unexpected time period, and the system safety is improved; the situation that the transmission of the data stream with low importance level influences the data stream with high importance level can be avoided.
Description
Technical Field
The invention relates to an intelligent substation inter-bay communication system for determining time delay, and belongs to the technical field of intelligent substations.
Background
The intelligent substation adopts advanced, reliable, integrated and environment-friendly intelligent equipment, and automatically completes basic functions of information acquisition, measurement, control, protection, metering, detection and the like according to basic requirements of total-station information digitization, communication platform networking and information sharing standardization. The release of the IEC61850 standard provides a standard specification for the construction of the intelligent substation, and the interoperation of devices among different manufacturers is realized. Compared with a conventional substation, secondary equipment networking is one of key technologies of an intelligent substation.
In the design and construction of the transformer substation, the transformer substation is formed by respectively combining parts such as an incoming line, a main transformer high voltage, a main transformer low voltage, a main transformer, a low voltage outgoing line and the like, wherein each part is called an interval, and the transformer substation can be visually divided into a plurality of blocks by the interval. The secondary equipment in the intelligent substation interval comprises a merging unit, an intelligent terminal, protection equipment, measurement and control equipment and a switch, and the communication function between the equipment is realized through Ethernet. The merging unit is a source of the analog quantity, assembles the analog quantity information into an SMV type Ethernet frame and sends the SMV type Ethernet frame to other equipment. The intelligent terminal collects the switching value information and executes the received operation command (GOOSE). The protection and measurement and control equipment is main control equipment in an interval and completes application functions of protection, measurement and the like.
The requirements on the real-time performance of analog quantity and switching quantity information required by secondary equipment for protection, measurement and control and the like for completing application functions are high, and the actual generation time of the information needs to be traced. If the network data frame carrying the information is transmitted through the switch, the transmission delay of the data may be uncertain due to the port collision, so that the receiving device needs to spend extra time to digest the uncertainty, and the action speed is slow. In the field of intelligent substations, the following two methods are generally adopted for solving the problems:
1. the equipment in the interval adopts a point-to-point communication mode as required. The scheme can cause the number of the network ports of the secondary equipment to increase, and brings complexity of hardware design; and complicates the overall network topology and also requires more communication wires.
2. The devices in the interval form a network through the switch, and all the devices mark the occurrence time of the information through a uniform global clock time marking system. Although the scheme can trace back the information occurrence time through a global unified time scale (generally obtained from a GPS system), the problem of delay jitter of information transmission is not solved. The global GPS synchronization failure can cause all the intervals to work abnormally, and the serious result of the abnormal work of the whole station is caused.
In summary, a communication method which gives consideration to both economy and safety is also lacked in the communication of the equipment in the interval of the existing intelligent substation, the number of network ports of the equipment can be reduced, the hardware design is simplified, and the application function of each equipment in the interval does not need to depend on an external time synchronization system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an intelligent substation inter-bay communication system for determining time delay.
In order to solve the technical problem, the invention provides an intelligent substation inter-bay communication system for determining time delay, wherein an intelligent substation is divided into a plurality of components according to intervals, an exchanger and secondary equipment are arranged in each interval, the secondary equipment comprises a merging unit, an intelligent terminal, protection equipment and measurement and control equipment,
the secondary equipment at least comprises 1 communication network port and is connected to the switch through the network port;
the merging unit sends analog quantity information to the protection equipment and the measurement and control equipment through the switch; the intelligent terminal sends and receives switching value information through the switch; the protection equipment and the measurement and control equipment complete application functions according to the network data acquired from the switch and send result information to the intelligent terminal to execute action commands;
the data streams transmitted in the network are graded according to the real-time requirements and are marked as different data streams, wherein the analog quantity information is a high-priority data stream, and the switching value information and the result information are low-priority data streams;
any secondary device in the network is selected as a main device, all other secondary devices and the main device synchronously operate in the same period, the time period lengths of all the secondary devices in the network are equal, the start time and the end time are the same, the network port receiving and sending working states of the secondary devices can be divided into at least one time slot in the period, and each time slot is divided into an on state and an off state.
Further, the analog quantity information is an SMV type data frame, and the switching quantity information and the result information are GOOSE type data frames.
Further, the switch and the secondary device mark the frame with the same application function as a designated data stream, and allocate different sending and receiving time slots for each designated data stream.
Furthermore, when the gating time slot state of a sending port of a certain network port of the secondary equipment is 'on', data is allowed to be sent through the sending port; when the gating time slot state of the transmitting port of the network port is 'off', the data is not allowed to be transmitted through the transmitting port, and the data to be transmitted is cached until the next 'on' time slot is transmitted continuously;
when the receiving network port gating time slot state of a certain network port of the secondary equipment is 'on', allowing the sending network port to receive data; when the receiving network port gating time slot state of the network port is 'off', the data is not allowed to be transmitted through the transmitting network port, the data reaching the network port in the 'off' time slot is discarded, and the receiving is not recovered until the next 'on' time slot.
Further, for the transmission port gated time slot state, the time period is divided into at least one time slot, any "on" or "off" time slot does not exceed the time length of the period, and the sum of the "on" and "off" time slots is equal to the period length;
for receive portal gated slot states, the time period is divided into at least one slot, neither the "on" or "off" slots exceed the time length of the period, and the sum of the "on" and "off" slots equals the period length.
Furthermore, according to the transmission path of the specified data stream and the transmission time of the specified data stream, dividing gating time slots for secondary equipment on the transmission path of the specified data stream, wherein the sending gating 'on' time corresponding to the stream on the source equipment is greater than the frame transmission time and is synchronous with the receiving gating 'on' time on the destination equipment;
the transmission gating of the source device is set to "off" and time synchronized with the reception gating "off" at the destination device during time slots in which transmission of the stream data is not expected to be required, based on the frame transmission time of the given data stream.
Further, the time slot setting information of each network port of the device in the network is acquired by means of offline setting or online issuing of the management unit, after the device acquires new setting information, the network transceiving function needs to be suspended, and the device resumes after the setting becomes effective.
Further, the network is a hundred mega or gigabit ethernet, and the communication medium is an optical fiber or a cable.
The invention achieves the following beneficial effects:
the invention can realize the communication function of a plurality of devices in a plurality of intelligent substation intervals in a switch networking mode, and each device only needs at least one network port, thereby reducing the complexity of hardware design and improving the reliability of the device. Secondly, the gated time slot sent and received by the network port is set to be 'on' according to the transmission path, so that the delay certainty of the transmission of the key data in the network can be realized. Thirdly, outside the expected transmission time, the gating time slot for the transmission and the reception of the network port is set to be 'off', so that the device can be prevented from receiving related data in an unexpected time period, and the system safety is improved. And fourthly, dividing the gating time slot to ensure that the time slot allowed to be transmitted by the low important level data stream is not overlapped with the high important level data stream in time, thereby avoiding the condition that the transmission of the low important level data stream influences the high important level data stream.
Drawings
FIG. 1 is a schematic diagram of data flow in a situation where devices in an interval are networked by using the method of the present invention;
fig. 2 shows the gated time slots of the respective devices on the transmission path of the SMV data stream from the merging unit to the protection device.
Ts0 is the 1 st time slot in the cycle, Ts1 is the 2 nd time slot in the cycle, Ts2 is the 3 rd time slot in the cycle; tfs is SMV frame transmission time, and is determined by frame length and network bandwidth; tds is the total delay of the transmission of the SMV frame from the source device to the destination device; tcycle is a cycle with a time length of 250 us;
fig. 3 is a result of allocating gated time slots of equipments on a transmission path of a GOOSE data stream from an intelligent terminal to a protection device;
ts0 is the 1 st time slot in the cycle, Ts1 is the 2 nd time slot in the cycle, Ts2 is the 3 rd time slot in the cycle; tfg is GOOSE frame transmission time, which is determined by frame length and network bandwidth; tdg is the total delay of GOOSE frame transmission from the source device to the destination device; tcycle is a cycle with a time length of 250 us;
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment, as shown in fig. 1, an inter-bay communication system for an intelligent substation for determining a delay includes a merging unit, an intelligent terminal, a protection device, and a measurement and control device. The devices are connected to the switch by using 1 communication network port, and the communication function is realized in a network mode.
In this embodiment, as shown in fig. 1, the data flow direction in the interval is schematic, the merging unit is an analog quantity source in the interval, and sends analog quantity information to the protection device and the measurement and control device through a network in an SMV frame (ethernet frame type is 0x88 BA); and the intelligent terminal finishes collecting switching value signals, and the switching values form GOOSE type network data frames (the Ethernet frame type is 0x88B 8). And the protection and measurement and control equipment completes application functions such as relay protection, measurement and the like according to the acquired network data and sends the result to the intelligent terminal to execute an action command through the GOOSE type frame.
In this embodiment, the SMV type data frames are high priority data streams, and the GOOSE and other types of data frames are low priority data streams.
In this embodiment, the merging unit serves as an intra-interval master device, and in the operation process, the master device sends the time information of the master device to other devices in the network through a PTP1588 time synchronization protocol.
In this embodiment, each device in the interval takes 250us as a cycle, the cycles of the devices are synchronized, and the real time and the end time of the cycle are the same. A
In this embodiment, an FPGA (Field programmable Gate Array) is used to implement a network transmitting and receiving port controller of each device. The port controller may set the transmission or reception state of the port to an on state or an off state according to a preset time slot allocation condition.
In this embodiment, when the gated timeslot state of the transmission port of the network port is "on", data is allowed to be transmitted through the transmission port. When the gating time slot state of the transmitting port of the network port is 'off', the data is not allowed to be transmitted through the transmitting port, and the data to be transmitted is cached until the next 'on' time slot is continuously transmitted.
In this embodiment, when the receiving gate time slot of the gate is "on", the data is allowed to be received through the receiving port. When the receiving network port gating time slot state of the network port is 'closed', the data is not allowed to be transmitted through the transmitting network port, the data reaching the network port in the 'closed' time slot can be discarded, and the receiving is not recovered until the next 'open' time slot.
In this embodiment, the port operating status of the devices in the interval may be divided into 3 slots in each 250 cycles, which are respectively identified as slot 1(Ts1), slot 2(Ts2), and slot 3(Ts 3). The merging unit, the intelligent terminal, the switch, the protection device and the measurement and control device are divided by the same time slot, wherein Ts1 is 50 us; ts2 ═ 50 us; ts3 ═ 150 us.
In this embodiment, the gating setting corresponding to the SMV data stream of each device is as follows:
TABLE 1 Interval device SMV data flow gating settings
As shown in the above table: in the interval, the merging unit is the source device of the SMV data stream, and Ts0 sends "on" time slot for it, so as shown in fig. 2, the merging unit starts sending SMV data frame at the start time of Ts0, and the transmission time of the frame in the network is Tf; since the downstream device switch of the merging unit is in the receive "on" and transmit "off" state at Ts0, the SMV frame is buffered and waits for the transmit "on" slot of the switch. The Ts2 time slot begins and the switch is in the transmit on state, so the SMV frame is transmitted from the switch to the protection device. Therefore, the transmission delay Td of the SMV frame is Tf + Ts0, and the transmission delay of the frame in the network is a certain value.
In this embodiment, the gating setting of each device corresponding to the GOOSE data stream is as follows:
TABLE 2 GOOSE data stream gating settings for devices within an interval
As shown in fig. 1: in the interval, other devices except the merging unit all send GOOSE data streams, and all devices receive the GOOSE data streams. Gating was set as shown in table 2. GOOSE data stream transmission as shown in fig. 3, the GOOSE data stream completes the transmission from the source device to the destination device within Ts3 time slot. All devices are not allowed to send or receive GOOSE data stream outside Ts3 time slot, ensuring that GOOSE data stream transmission does not affect higher priority SMV data stream.
In this embodiment, the transmission gate corresponding to the stream is set to "off" in a time slot in which the source device expects not to need to transmit certain data, and is time-synchronized with the reception gate "off" on the destination device. When the running state of the source device is abnormal or the network topology is wrong, the receiving device receives the streaming data frame in unexpected time, and the frame data is discarded because the interface gating state is off. Thereby implementing an isolation function for the abnormal data.
In the method, the time slot gating setting information of each network port of equipment in the network is realized by adopting an off-line setting mode, when the transmission condition of network topology or data stream changes, each equipment needs to quit operation, and the time slot gating setting information needs to be set again according to the requirement.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. An intelligent substation inter-bay communication system for determining time delay, wherein the intelligent substation is divided into a plurality of components according to intervals, each interval comprises a switch and secondary equipment, each secondary equipment comprises a merging unit, an intelligent terminal, protection equipment and measurement and control equipment, and the communication system is characterized in that,
the secondary equipment at least comprises 1 communication network port and is connected to the switch through the network port;
the merging unit sends analog quantity information to the protection equipment and the measurement and control equipment through the switch; the intelligent terminal sends and receives switching value information through the switch; the protection equipment and the measurement and control equipment complete application functions according to the network data acquired from the switch and send result information to the intelligent terminal to execute action commands;
the data streams transmitted in the network are graded according to the real-time requirements and are marked as different data streams, wherein the analog quantity information is a high-priority data stream, and the switching value information and the result information are low-priority data streams;
selecting any secondary device in the network as a main device, wherein all other secondary devices and the main device synchronously operate in the same period, the time period lengths of all the secondary devices in the network are equal, and the time periods of all the secondary devices in the network have the same starting time and ending time, the network port receiving and sending working states of the secondary devices can be divided into at least one time slot in the period, and each time slot is divided into an on state and an off state;
the switch and the secondary equipment mark the frame with the same application function as a designated data stream and allocate different sending and receiving time slots for each designated data stream;
according to the transmission path of the specified data stream and the transmission time of the specified data stream, dividing gating time slots for secondary equipment on the transmission path of the specified data stream, wherein the sending gating 'on' time corresponding to the stream on the source equipment is greater than the frame transmission time and is synchronous with the receiving gating 'on' time on the destination equipment;
the transmission gating of the source device is set to "off" and time synchronized with the reception gating "off" at the destination device in time slots where transmission of the specified data stream is not expected to be required, based on the frame transmission time of the specified data stream.
2. The intelligent substation bay interval communication system for determining time delay of claim 1, wherein the analog quantity information is SMV type data frames and the switching quantity information and the result information are GOOSE type data frames.
3. The intelligent substation interval intra-interval communication system for determining the time delay according to claim 1, wherein when the gating time slot state of a transmission port of a certain network port of the secondary equipment is "on", data transmission through the transmission port is allowed; when the gating time slot state of the transmitting port of the network port is 'off', the data is not allowed to be transmitted through the transmitting port, and the data to be transmitted is cached until the next 'on' time slot is transmitted continuously;
when the receiving network port gating time slot state of a certain network port of the secondary equipment is 'on', allowing the receiving network port to receive data; when the receiving network port gating time slot state of the network port is 'off', the data is not allowed to be transmitted through the receiving network port, the data reaching the network port in the 'off' time slot is discarded, and the receiving is not recovered until the next 'on' time slot.
4. The intelligent substation bay intra-bay communication system for determining latency of claim 3, wherein for a transmit port gated time slot state, the time period is divided into at least one time slot, no "on" or "off" time slot exceeds the time length of the period, the sum of the "on" and "off" time slots being equal to the period length;
for receive portal gated slot states, the time period is divided into at least one slot, neither the "on" or "off" slots exceed the time length of the period, and the sum of the "on" and "off" slots equals the period length.
5. The intelligent substation interval internal communication system for determining the time delay as claimed in claim 1, wherein the time slot setting information of each network port of the equipment in the network is acquired by means of offline setting or online issuing of a management unit, after the equipment acquires new setting information, the network transceiving function needs to be suspended, and the communication system is resumed after the setting becomes effective.
6. The intelligent substation bay-to-bay communication system for determining latency of claim 1, wherein the network is a hundred megabytes or gigabytes ethernet and the communication medium is an optical fiber or a cable.
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| CN103633741B (en) * | 2013-12-05 | 2015-11-18 | 长园深瑞继保自动化有限公司 | Intelligent substation sampled value network data switching method |
| CN103840554B (en) * | 2014-03-04 | 2015-12-30 | 国电南京自动化股份有限公司 | A kind of intelligent substation distributed fault record ripple and network analysis system |
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