A method and system for estimating data flow in a substation

Abstract

The present invention discloses a method for estimating substation data traffic. The method comprises: estimating the normal and burst data traffic of DL / T 860 communication messages in the substation control layer network based on the substation's secondary equipment configuration; estimating the normal and burst data traffic of PMU communication messages based on the secondary equipment configuration; estimating the data traffic between the substation control layer host and the integrated application server based on the secondary equipment configuration; estimating the normal and burst data traffic of the measurement and control device GOOSE based on the secondary equipment configuration; estimating the normal and burst data traffic of the protection device GOOSE based on the secondary equipment configuration; estimating the data traffic of SNTP messages in the substation control layer network based on the secondary equipment configuration; estimating the data traffic of ARP messages in the substation control layer network based on the secondary equipment configuration; and / or estimating the data traffic of the acquisition and execution unit based on the secondary equipment configuration. This method provides a data foundation for designing network configuration, equipment configuration, and performance measurement for the secondary system of a new generation of substations.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering and power system substation network data technology, and more particularly to a substation data flow estimation method and system. Background Art

[0002] As the core node for power and information flow, substations are crucial for power grid construction and operation. Substation secondary systems, comprised of protection equipment, automation equipment, station control layer equipment and software, metering and power quality equipment, communications and safety equipment, and auxiliary equipment, are responsible for protection, control, measurement, and monitoring, enabling the real-time collection and transmission of equipment operating data, alarm information, and monitoring data. Providing operational and data support for remote master stations, they play a vital role in ensuring stable grid operation and control, accommodating new energy, rapidly clearing faults, and mitigating the risk of major accidents. They are crucial for the safe and stable operation of power systems.

[0003] With the development of smart substations, the construction of a new generation of substation secondary systems is being proposed. To meet diverse business needs both remotely and within the substation, this new generation of substation secondary systems incorporates centralized control stations. These stations are responsible for monitoring and managing the status of primary, secondary, and auxiliary equipment in the substation. The substation only provides data and functional services to the main station, supporting on-site operation, maintenance, and emergency duty. Centralized control stations are equipped with monitoring systems to monitor, control, and manage the operation of multiple substations within their jurisdiction. As these centralized control stations connect to numerous substations, generate a wealth of information, and generate large amounts of data, it is necessary to estimate substation data traffic to inform the scale of access and design of their monitoring systems.

[0004] Secondly, compared with the "three layers (station control layer, bay layer, process layer) and two networks (station control layer network, weighing layer network)" of conventional smart substations, the new generation of substation secondary system substation network architecture cancels the process layer network. The GOOSE information originally transmitted at the process layer can only be transmitted through the station control layer. Therefore, the station control layer network carries the message transmission of the entire station. The existing substation station control layer data traffic evaluation method cannot meet the requirements of the new network architecture.

[0005] In addition, the new generation of substation secondary systems has made improvements in the communication protocol, using the autonomous and controllable DL / T 860 communication message to replace the original MMS message, and directly mapping the DL / T 860 abstract communication service interface to the TCP / IP protocol for data interaction. The communication data structure, service parameters, encoding and decoding rules and interaction requirements have all changed, so the data flow calculation method of each device has changed. Summary of the Invention

[0006] The present invention provides a substation data flow estimation method and system to solve the problems existing in the prior art.

[0007] According to a first aspect of the present invention, a method for estimating substation data flow is provided, the method comprising:

[0008] Determine the secondary equipment configuration of the substation based on the scale of outgoing lines of the substation;

[0009] According to the secondary equipment configuration of the substation, estimate the normal data flow and burst data flow of the DL / T 860 communication messages of the station control layer network, estimate the normal data flow and burst data flow of the PMU communication messages according to the secondary equipment configuration, estimate the data flow between the station control layer host and the integrated application server according to the secondary equipment configuration, estimate the normal data flow and burst data flow of the measurement and control device GOOSE according to the secondary equipment configuration, estimate the normal data flow and burst data flow of the protection device GOOSE, estimate the data flow of the SNTP messages of the station control layer network according to the secondary equipment configuration, estimate the data flow of the ARP messages of the station control layer network according to the secondary equipment configuration and / or estimate the data flow of the acquisition and execution unit according to the secondary equipment configuration.

[0010] Optionally, estimating normal data traffic and burst data traffic of DL / T 860 communication messages of the station control layer network according to the secondary equipment configuration of the substation includes:

[0011] In the same network, the number of station control layer devices is determined to be M, and the number of bay layer devices is determined to be N;

[0012] Determine the normal data flow of messages between the bay layer and the station control layer according to the number M of the station control layer devices and the number N of the bay layer devices;

[0013] The burst data flow of the message between the bay layer and the station control layer is determined according to the number M of the station control layer devices and the number N of the bay layer devices.

[0014] Optionally, estimating normal data flow and burst data flow of PMU communication messages based on the secondary equipment configuration of the substation includes:

[0015] Determine the frame length, phasor, analog quantity, switch quantity and frame rate of PMU communication message;

[0016] estimating a normal data flow of the PMU communication message according to a frame length, a phasor, an analog quantity, a switching quantity, and a frame rate of the PMU communication message;

[0017] The burst data flow of the PMU communication message is estimated to be zero.

[0018] Optionally, estimating the normal data flow and burst data flow of the measurement and control device GOOSE and the normal data flow and burst data flow of the protection device GOOSE according to the secondary equipment configuration of the substation includes:

[0019] Estimate the normal data flow of the GOOSE measurement and control device based on the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device;

[0020] Estimate the burst data traffic of the GOOSE device based on the GOOSE message frame length and GOOSE time window of the measurement and control device;

[0021] Estimate the normal data flow of the protection device GOOSE based on the GOOSE message frame length and GOOSE heartbeat message period of the protection device;

[0022] Estimate the burst data traffic of the protection device GOOSE based on the GOOSE message frame length and GOOSE time window of the protection device.

[0023] Optionally, estimating the data flow of SNTP messages of the station control layer network according to the secondary equipment configuration of the substation includes:

[0024] Estimate the data flow of SNTP messages in the station control layer network based on the frame length and heartbeat period of the SNTP messages in the station control layer network and the number of devices in the station control layer.

[0025] Optionally, estimate the data traffic of ARP packets on the station control layer network, including:

[0026] Determine the frame length of the ARP message and the number of station control layer devices;

[0027] The data flow of the ARP message in the station control layer network is estimated based on the frame length of the ARP message and the number of station control layer devices.

[0028] Optionally, estimating the data flow of the collection execution unit according to the secondary equipment configuration of the substation includes:

[0029] According to the number of control blocks of the acquisition execution unit, the average frame length of each control block and the GOOSE heartbeat message period, the data flow of the acquisition execution unit to send GOOSE is estimated;

[0030] The data flow of the SV sent by the collection execution unit is estimated according to the number of control blocks of the collection execution unit, the average frame length of each control block, and the SV heartbeat message period.

[0031] According to another aspect of the present invention, a substation data flow estimation system is provided, the system comprising:

[0032] The module for determining the secondary equipment configuration is used to determine the secondary equipment configuration of the substation according to the scale of the substation outgoing lines;

[0033] A data traffic estimation module is used to estimate the normal data traffic and burst data traffic of the DL / T860 communication messages of the station control layer network according to the secondary equipment configuration of the substation, estimate the normal data traffic and burst data traffic of the PMU communication messages according to the secondary equipment configuration, estimate the data traffic between the station control layer host and the integrated application server according to the secondary equipment configuration, estimate the normal data traffic and burst data traffic of the measurement and control device GOOSE according to the secondary equipment configuration, estimate the normal data traffic and burst data traffic of the protection device GOOSE according to the secondary equipment configuration, estimate the data traffic of the SNTP messages of the station control layer network according to the secondary equipment configuration, estimate the data traffic of the ARP messages of the station control layer network according to the secondary equipment configuration and / or estimate the data traffic of the acquisition and execution unit according to the secondary equipment configuration.

[0034] Optionally, the data traffic estimation module includes:

[0035] Determine the equipment unit, which is used to determine the number of station control layer equipment as M and the number of bay layer equipment as N within the same network;

[0036] A unit for determining a normal flow rate of DL / T 860 communication messages is configured to determine a normal data flow rate of messages between the bay layer and the station control layer based on the number M of devices in the station control layer and the number N of devices in the bay layer;

[0037] The DL / T 860 communication message burst flow determination unit is used to determine the burst data flow of messages between the bay layer and the station control layer based on the number M of the station control layer devices and the number N of the bay layer devices.

[0038] Optionally, the data traffic estimation module includes:

[0039] Determine the PMU communication message parameter unit, used to determine the frame length, phasor, analog quantity, switch quantity and frame rate of the PMU communication message;

[0040] a PMU communication message normal flow estimating unit, configured to estimate the normal data flow of the PMU communication message according to the frame length, phasor, analog quantity, switch quantity, and frame rate of the PMU communication message;

[0041] The PMU communication message burst flow estimating unit is used to estimate the burst data flow of the PMU communication message to be zero.

[0042] Optionally, the data traffic estimation module includes:

[0043] The normal flow estimation unit of the measurement and control device is used to estimate the normal data flow of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device;

[0044] The measurement and control burst traffic estimation unit is used to estimate the burst data traffic of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE time window of the measurement and control device;

[0045] The protection normal traffic estimation unit is used to estimate the normal data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the protection device;

[0046] The protection burst traffic estimation unit is used to estimate the burst data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE time window of the protection device.

[0047] Optionally, the data traffic estimation module includes:

[0048] The SNTP message flow estimation unit is used to estimate the data flow of the SNTP messages of the station control layer network based on the frame length of the SNTP messages of the station control layer network, the heartbeat message period of the SNTP messages of the station control layer network, and the number of station control layer devices.

[0049] Optionally, the data traffic estimation module includes:

[0050] Determine the ARP message parameter unit, which is used to determine the frame length of the ARP message and the number of station control layer devices;

[0051] The ARP message flow estimation unit is used to estimate the data flow of the ARP message of the station control layer network according to the frame length of the ARP message and the number of station control layer devices.

[0052] Optionally, the data traffic estimation module includes:

[0053] The estimation collection execution unit sends the GOOSE unit, which is used to estimate the data flow of the collection execution unit sending GOOSE according to the number of control blocks of the collection execution unit, the average frame length of each control block and the GOOSE heartbeat message period;

[0054] The SV sending unit of the collection execution unit is estimated to estimate the data flow of the SV sent by the collection execution unit according to the number of control blocks of the collection execution unit, the average frame length of each control block and the SV heartbeat message period.

[0055] This method estimates the data flow of DL / T 860 communication messages at the station control layer, PMU communication messages, synchronization data for Zones I and II at the station control layer, GOOSE messages, SNTP messages, and network ARP messages. This method effectively estimates the normal and sudden data flow of the substation control layer network, resolving the problem of data estimation at the station control layer. Even if the new generation substation eliminates the process layer network, GOOSE information previously transmitted at the process layer can only be transmitted through the station control layer. The use of autonomous and controllable DL / T 860 communication messages replaces the original MMS messages, and the DL / T 860 abstract communication service interface is directly mapped to the TCP / IP protocol for data exchange. This changes the communication data structure, service parameters, encoding and decoding rules, and interaction requirements. This method also provides a data foundation for network configuration, equipment configuration, and performance measurement of the secondary system design of the new generation substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0057] Figure 1 This is a flow chart of a method for estimating substation data flow according to this embodiment;

[0058] Figure 2 This is a schematic diagram of estimating the flow of secondary equipment in a substation according to this embodiment;

[0059] Figure 3 Schematic diagram of a substation data flow estimation system according to this embodiment. DETAILED DESCRIPTION

[0060] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0061] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0062] According to a first aspect of this embodiment, a method for estimating substation data flow is provided, referring to Figure 1As shown, the method includes:

[0063] S101: Determine the secondary equipment configuration of the substation based on the scale of the substation outgoing lines;

[0064] S102: According to the secondary equipment configuration of the substation, estimate the normal data flow and burst data flow of the DL / T 860 communication message of the station control layer network, estimate the normal data flow and burst data flow of the PMU communication message of the secondary equipment configuration, estimate the data flow between the station control layer host and the integrated application server of the secondary equipment configuration, estimate the normal data flow and burst data flow of the measurement and control device GOOSE of the secondary equipment configuration, estimate the normal data flow and burst data flow of the protection device GOOSE, estimate the data flow of the SNTP message of the station control layer network, estimate the data flow of the ARP message of the station control layer network and / or estimate the data flow of the acquisition and execution unit of the secondary equipment configuration.

[0065] Specifically, refer to Figure 2 As shown, during the planning and design phase of a new generation substation, the substation secondary equipment configuration is first determined based on the scale of the substation outgoing lines, and a list of equipment configurations for the station control layer, bay layer, and process layer is drawn up; based on the design specifications for the new generation substation, a preliminary substation secondary system network structure diagram is drawn; based on the number of substation secondary equipment and the quantity flow estimation method of this patent, the normal data flow and burst data flow of the station control layer network are estimated; based on the calculation results, the network equipment and network architecture of the substation are finally determined.

[0066] The station control layer network of the new-generation substation secondary system carries communication messages between station control and bay-layer devices, including inter-bay GOOSE communication messages between protection and measurement and control devices, as well as other GOOSE messages sent from protection and measurement and control devices to intelligent fault recorders. Station control layer data primarily includes DL / T 860 communication messages, PMU communication messages, station control layer Zone I / II synchronization data, GOOSE messages, SNTP messages, and network ARP messages. Considering the possibility of small-scale network formation of collection and execution units based on field needs, data traffic for collection and execution units has also been estimated.

[0067] This method estimates the data flow of DL / T 860 communication messages at the station control layer, PMU communication messages, synchronization data for Zones I and II at the station control layer, GOOSE messages, SNTP messages, and network ARP messages. This method effectively estimates the normal and sudden data flow of the substation control layer network, resolving the problem of data estimation at the station control layer. Even if the new generation substation eliminates the process layer network, GOOSE information previously transmitted at the process layer can only be transmitted through the station control layer. The use of autonomous and controllable DL / T 860 communication messages replaces the original MMS messages, and the DL / T 860 abstract communication service interface is directly mapped to the TCP / IP protocol for data exchange. This changes the communication data structure, service parameters, encoding and decoding rules, and interaction requirements. This method also provides a data foundation for network configuration, equipment configuration, and performance measurement of the secondary system design of the new generation substation.

[0068] Optionally, estimating normal data traffic and burst data traffic of DL / T 860 communication messages of the station control layer network according to the secondary equipment configuration of the substation includes:

[0069] In the same network, the number of station control layer devices is determined to be M, and the number of bay layer devices is determined to be N;

[0070] Determine the normal data flow of messages between the bay layer and the station control layer according to the number M of the station control layer devices and the number N of the bay layer devices;

[0071] The burst data flow of the message between the bay layer and the station control layer is determined according to the number M of the station control layer devices and the number N of the bay layer devices.

[0072] Specifically, the DL / T 860 communication data interaction content of the station control layer mainly includes:

[0073] Telesignaling, telemetering, action information, recording files and intermediate node files from the bay layer equipment (relay protection, measurement and control, etc.) in Zone I to the station control layer equipment (monitoring host, communication gateway, integrated application server, etc.).

[0074] Recording information from the recorder in Zone II to the integrated application server.

[0075] Status monitoring of various primary equipment (switches, transformers, lightning arresters) in Zone II, including IED, auxiliary control system, integrated power supply and status monitoring of integrated application servers, and auxiliary control information.

[0076] The opening and closing instructions of switches and knife switches from the station control layer equipment (monitoring host, communication gateway, etc.) in Zone I to the bay layer equipment (relay protection, measurement and control, etc.), and the gear control of the transformer on-load tap changer, etc.

[0077] Because DL / T 860 communication messages are mainly unicast messages, and the traffic from the bay layer device to the station control layer device is much larger than the traffic from the station control layer device to the bay layer device, only the bandwidth occupied by the uplink traffic of the bay layer device needs to be considered.

[0078] If the number of station control layer devices is M and the number of bay layer devices is N in the same network, the average bandwidth occupied by the message traffic between the bay layer and the station control layer is:

[0079] M*N*5.8Kbps (measured protection device traffic)

[0080] The bandwidth occupied by burst traffic varies greatly. When calling the recording file, the average bandwidth is 170kbps, and the instantaneous bandwidth can reach 14Mbps. Figure 1 Based on the average burst traffic of 170 kbps, the number of devices in the station control layer is M, the number of devices in the bay layer is N, and the average bandwidth occupied by the message traffic between the bay layer and the station control layer is: M*N*170 kbps.

[0081] This figure represents the message traffic flow through the same switch port when M station control devices and N bay devices simultaneously call recording files. This maximum traffic flow only occurs in theoretical conditions. In actual networking scenarios, where protection devices are distributed across different switches, the maximum message traffic flow through a switch port depends on the number of actual communication links.

[0082] Optionally, estimating normal data flow and burst data flow of PMU communication messages based on the secondary equipment configuration of the substation includes:

[0083] Determine the frame length, phasor, analog quantity, switch quantity and frame rate of PMU communication message;

[0084] estimating a normal data flow of the PMU communication message according to a frame length, a phasor, an analog quantity, a switching quantity, and a frame rate of the PMU communication message;

[0085] The burst data flow of the PMU communication message is estimated to be zero.

[0086] Specifically, the multifunctional measurement and control integrates PMU functions, DL / T 860 communication message / GOOSE / PMU common port: frame length 136 bytes (one interval): 8 phasors, 6 analog quantities, 32 switch quantities, 10ms per frame.

[0087] Normal traffic: (136B)*8 / 10ms=108.8kb / s;

[0088] Burst traffic: Almost none.

[0089] M* Single-unit measurement and control flow, calculated based on 50-unit interval measurement and control:

[0090] 50*108.8kb / s=5.44Mb / s

[0091] The PMU transmission protocol is based on TCP, and the traffic of 50 PMUs can only be superimposed at the network port of the gateway machine (concentrator).

[0092] In addition, data is synchronized between the station control layer host in Area I and the comprehensive application server in Area II.

[0093] The synchronization protocol is generally a private protocol that realizes database synchronization between multiple machines. According to the configuration of 2 monitoring hosts and 2 integrated application servers, the synchronization flow of a typical 220kV substation is approximately: 20Mbps

[0094] Since the data flow is too large, the station control layer host synchronization should be networked separately.

[0095] Optionally, estimating the normal data flow and burst data flow of the measurement and control device GOOSE and the normal data flow and burst data flow of the protection device GOOSE according to the secondary equipment configuration of the substation includes:

[0096] Estimate the normal data flow of the GOOSE measurement and control device based on the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device;

[0097] Estimate the burst data traffic of the GOOSE device based on the GOOSE message frame length and GOOSE time window of the measurement and control device;

[0098] Estimate the normal data flow of the protection device GOOSE based on the GOOSE message frame length and GOOSE heartbeat message period of the protection device;

[0099] Estimate the burst data traffic of the protection device GOOSE based on the GOOSE message frame length and GOOSE time window of the protection device.

[0100] Specifically, the GOOSE data interaction content at the station control layer mainly includes:

[0101] a) Information on starting failure, blocking reclosing, and failure tripping of line protection, main transformer protection, and busbar differential protection;

[0102] b) Busbar protection to line protection remote trip;

[0103] c) Prepare automatic opening and closing of relevant circuit breakers on the low-voltage side (if point-to-point is not used);

[0104] d) Lockout tripping information of simple busbar differential to main transformer protection;

[0105] e) Information on automatic overload tripping of low-voltage circuit breakers;

[0106] f) Protection action information from each protection device to the recorder;

[0107] g) Tripping information from the stabilizing device to the low-voltage all-in-one device;

[0108] h) Low frequency and low voltage load shedding, overload joint tripping of related circuit breakers (if point-to-point is not used);

[0109] i) Protection tripping signal and blocking signal between the stabilization device and the protection device;

[0110] j) Remote interlocking GOOSE information between measurement and control devices;

[0111] k) A / B sets of main transformer protection action blocking and standby (cross-grid);

[0112] l) A / B sets of main transformer protection trip low (35 / 10kV) segment (across the network);

[0113] m) Dual-set line / bus differential protection with three-trip mutual blocking and reclosing (across networks);

[0114] n) A / B set safety control action cuts off 35 / 10kV outgoing line (across the network).

[0115] 1. Measurement and control of GOOSE data and message frame length

[0116] 1) Bay measurement and control (line, busbar, main transformer single side)

[0117] GOOSE sends information 1 (double-point with quality): circuit breaker, knife switch 1, knife switch 2, bypass mother knife switch

[0118] Frame length: 162 bytes

[0119] GOOSE send information 2 (floating point with quality): line voltage, line current

[0120] Frame length: 154 bytes

[0121] 2) Busbar measurement and control (considering two busbar sections)

[0122] GOOSE sends information 1 (double-point quality): busbar 1 grounding knife 1, busbar 1 grounding knife 2, busbar 2 grounding knife 1, busbar 2 grounding knife 2

[0123] Frame length: 162 bytes

[0124] GOOSE sends information 2 (floating point with quality): bus voltage 1, bus voltage 2

[0125] Frame length: 154 bytes

[0126] 3) GOOSE flow measurement and control device

[0127] a) Single unit flow measurement and control

[0128] Heartbeat message traffic of a single interval measurement and control device: (162B+154B)*8 / 5s=506b / s

[0129] b) Heartbeat message traffic of the entire station

[0130] M* Single-unit measurement and control flow, calculated based on 50-unit interval measurement and control:

[0131] 50*506b / s=25.3kb / s

[0132] c) Burst traffic

[0133] When a single measurement and control unit sends GOOSE position changes, it sends data at intervals of 2, 2, 4, and 8 ms. The burst traffic with a time window of 2 ms is (162B+154B)*8 / 2ms=1.26M.

[0134] 2. Protect the length of GOOSE data and message frames

[0135] 1) Sending content and frame length

[0136] The protection device sends GOOSE data according to the virtual terminal definition of the technical specification. According to the measured message, the GOOSE data frame length is as follows:

[0137] Line protection frame length: 217 bytes;

[0138] Transformer protection frame length: 326 bytes;

[0139] Bus protection frame length: 250 bytes;

[0140] Stable device frame length: 300 bytes;

[0141] Low voltage protection and measurement integrated device: 200 bytes.

[0142] 2) Protection device flow

[0143] a) Single unit protection flow:

[0144] The length of GOOSE messages sent by various protection devices is calculated uniformly as 300 bytes. The heartbeat traffic of a single protection device is: 300B*8 / 5s=480b / s

[0145] b) Entire station protection flow

[0146] M*Single protection flow, calculated based on 100 protection devices

[0147] 100*480 / s=48kb / s

[0148] c) Burst traffic

[0149] When a single protection unit sends GOOSE changes, it sends data at intervals of 2, 2, 4, and 8 ms. The burst traffic with a 2 ms time window is 300B*8 / 2ms=1.2Mb.

[0150] Conclusion: If any protection or measurement and control device experiences continuous GOOSE shift, the GOOSE message traffic is approximately 1.2M, which is less than 2Mbps.

[0151] Optionally, estimating the data flow of SNTP messages of the station control layer network according to the secondary equipment configuration of the substation includes:

[0152] Estimate the data flow of SNTP messages in the station control layer network based on the frame length and heartbeat period of the SNTP messages in the station control layer network and the number of devices in the station control layer.

[0153] Specifically, a single SNTP message is within 90 bytes and completes one time calibration or measurement. The device being calibrated and the time synchronization device send and receive one message to each other.

[0154] 1) The time synchronization device calibrates the monitoring host: the time is adjusted every 10 seconds, and the bandwidth occupied is 90*8b / 10s=72bps

[0155] 2) The time synchronization device performs periodic ping-pong timing on the protection and measurement and control devices: The time synchronization device polls one device in the station control layer network every second, occupying a bandwidth of 90*8bps=720bps

[0156] The bandwidth occupied by the message traffic when the time synchronization device measures the NTP of the bay layer device is not related to the number of bay layer devices (the time synchronization device polls one bay layer device per second). Therefore, if the number of monitoring hosts is M1, the bandwidth occupied by the SNTP message traffic is fixed at: (72M1+720) bps

[0157] Assuming that the station control layer has 2 monitoring hosts, 2 integrated application servers, and 1 five-defense host, M1=5, and the SNTP message flow of the station control layer is (72*5+720)=1kbps.

[0158] Optionally, estimate the data traffic of ARP packets on the station control layer network, including:

[0159] Determine the frame length of the ARP message and the number of station control layer devices;

[0160] The data flow of the ARP message in the station control layer network is estimated based on the frame length of the ARP message and the number of station control layer devices.

[0161] Specifically, the ARP message length is 60 bytes. Before the IP message is sent for the first time, the client needs to send an ARP message, and there is an aging time. The aging time is related to the host operating system protocol stack and is generally in minutes.

[0162] ARP traffic is usually very small and can be ignored. However, when the monitoring host restarts, there will be a transient traffic spike. Usually, the host can send an ARP frame to all devices that need to be connected within 2ms, and it is a broadcast message. The transient traffic in the 2ms time window is:

[0163] M nodes * 60B / 1ms, calculated based on 200 nodes, 200*60B*8 / 2ms=48M.

[0164] Optionally, estimating the data flow of the collection execution unit according to the secondary equipment configuration of the substation includes:

[0165] According to the number of control blocks of the acquisition execution unit, the average frame length of each control block and the GOOSE heartbeat message period, the data flow of the acquisition execution unit to send GOOSE is estimated;

[0166] The data flow of the SV sent by the collection execution unit is estimated according to the number of control blocks of the collection execution unit, the average frame length of each control block, and the SV heartbeat message period.

[0167] Specifically, the execution unit data interaction content is collected, including GOOSE and SV data.

[0168] 1. GOOSE data and message frame length sent by the acquisition execution unit

[0169] 1) Sending content and frame length

[0170] The acquisition execution unit sends GOOSE data according to the virtual terminal definition of the technical specification. According to the measured message, the GOOSE data frame length is as follows:

[0171] Interval acquisition execution unit control block 1 frame length: 301 bytes;

[0172] Interval acquisition execution unit control block 2 frame length: 352 bytes;

[0173] Interval acquisition execution unit control block 3 frame length: 386 bytes;

[0174] Interval acquisition execution unit control block 4 frame length: 270 bytes;

[0175] Interval acquisition execution unit control block 5 frame length: 200 bytes;

[0176] Interval acquisition execution unit control block 6 frame length: 300 bytes;

[0177] Bus acquisition execution unit control block 1 frame length: 320 bytes;

[0178] Bus acquisition execution unit control block 2 frame length: 380 bytes;

[0179] Bus acquisition execution unit control block 3 frame length: 280 bytes;

[0180] Bus acquisition execution unit control block 4 frame length: 200 bytes.

[0181] 2) Collect the flow of execution unit devices

[0182] 1) Flow rate of a single device:

[0183] The length of the GOOSE message sent by the collection and execution device is uniformly calculated as 300 bytes. The heartbeat flow of a single interval collection and execution unit device is: 6*300B*8 / 5s=2880b / s, and the heartbeat flow of a single bus interval collection and execution unit device is: 4*300B*8 / 5s=1920b / s

[0184] 2. Collect SV data and message frame length sent by the execution unit

[0185] Sending content and frame length

[0186] The acquisition execution unit sends SV data according to the virtual terminal definition of the technical specification. According to the measured message, the SV data frame length is as follows:

[0187] Interval acquisition execution unit interval board control block frame length: 333 bytes;

[0188] Interval acquisition execution unit busbar control block frame length: 193 bytes;

[0189] Bus acquisition execution unit control block frame length: 377 bytes.

[0190] Collect the flow of execution unit devices

[0191] 1) Flow rate of a single device:

[0192] The length of the SV message sent by the interval acquisition execution unit is uniformly calculated as 260 bytes, the sampling rate is calculated as 4000Hz, and the flow rate of a single device is: 2*260B*8*4000Hz / 1024 / 1024=15.87Mb / s;

[0193] The length of the SV message sent by the bus acquisition execution unit is uniformly calculated as 380 bytes, the sampling rate is calculated as 4000Hz, and the flow rate of a single device is: 380B*8*4000Hz / 1024 / 1024=11.6Mb / s;

[0194] Due to the excessive data traffic, it is not recommended that the collection execution unit be connected to the station control layer network.

[0195] This method estimates the data flow of DL / T 860 communication messages at the station control layer, PMU communication messages, synchronization data for Zones I and II at the station control layer, GOOSE messages, SNTP messages, and network ARP messages. This method effectively estimates the normal and sudden data flow of the substation control layer network, resolving the problem of data estimation at the station control layer. Even if the new generation substation eliminates the process layer network, GOOSE information previously transmitted at the process layer can only be transmitted through the station control layer. The use of autonomous and controllable DL / T 860 communication messages replaces the original MMS messages, and the DL / T 860 abstract communication service interface is directly mapped to the TCP / IP protocol for data exchange. This changes the communication data structure, service parameters, encoding and decoding rules, and interaction requirements. This method also provides a data foundation for network configuration, equipment configuration, and performance measurement of the secondary system design of the new generation substation.

[0196] According to another aspect of this embodiment, a substation data flow estimation system 300 is provided. Figure 3 As shown, the system 300 includes:

[0197] A secondary equipment configuration determination module 310 is configured to determine the secondary equipment configuration of the substation based on the scale of the substation outgoing lines;

[0198] The data flow estimation module 320 is used to estimate the data flow according to the secondary equipment configuration of the substation.

[0199] Estimate the normal data flow and burst data flow of DL / T 860 communication messages in the station control layer network, estimate the normal data flow and burst data flow of PMU communication messages in the secondary equipment configuration, estimate the data flow between the station control layer host and the integrated application server in the secondary equipment configuration, estimate the normal data flow and burst data flow of the measurement and control device GOOSE in the secondary equipment configuration, estimate the normal data flow and burst data flow of the protection device GOOSE, estimate the data flow of SNTP messages in the station control layer network in the secondary equipment configuration, estimate the data flow of ARP messages in the station control layer network in the secondary equipment configuration and / or estimate the data flow of the acquisition and execution unit in the secondary equipment configuration.

[0200] Optionally, the data flow estimation module 320 includes:

[0201] Determine the equipment unit, which is used to determine the number of station control layer equipment as M and the number of bay layer equipment as N within the same network;

[0202] A unit for determining a normal flow rate of DL / T 860 communication messages is configured to determine a normal data flow rate of messages between the bay layer and the station control layer based on the number M of devices in the station control layer and the number N of devices in the bay layer;

[0203] The DL / T 860 communication message burst flow determination unit is used to determine the burst data flow of messages between the bay layer and the station control layer based on the number M of the station control layer devices and the number N of the bay layer devices.

[0204] Optionally, the data flow estimation module 320 includes:

[0205] Determine the PMU communication message parameter unit, used to determine the frame length, phasor, analog quantity, switch quantity and frame rate of the PMU communication message;

[0206] a PMU communication message normal flow estimating unit, configured to estimate the normal data flow of the PMU communication message according to the frame length, phasor, analog quantity, switch quantity, and frame rate of the PMU communication message;

[0207] The PMU communication message burst flow estimating unit is used to estimate the burst data flow of the PMU communication message to be zero.

[0208] Optionally, the data flow estimation module 320 includes:

[0209] The normal flow estimation unit of the measurement and control device is used to estimate the normal data flow of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device;

[0210] The measurement and control burst traffic estimation unit is used to estimate the burst data traffic of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE time window of the measurement and control device;

[0211] The protection normal traffic estimation unit is used to estimate the normal data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the protection device;

[0212] The protection burst traffic estimation unit is used to estimate the burst data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE time window of the protection device.

[0213] Optionally, the data flow estimation module 320 includes:

[0214] The SNTP message flow estimation unit is used to estimate the data flow of the SNTP messages of the station control layer network based on the frame length of the SNTP messages of the station control layer network, the heartbeat message period of the SNTP messages of the station control layer network, and the number of station control layer devices.

[0215] Optionally, the data flow estimation module 320 includes:

[0216] The estimation collection execution unit sends the GOOSE unit, which is used to estimate the data flow of the collection execution unit sending GOOSE according to the number of control blocks of the collection execution unit, the average frame length of each control block and the GOOSE heartbeat message period;

[0217] The SV sending unit of the collection execution unit is estimated to estimate the data flow of the SV sent by the collection execution unit according to the number of control blocks of the collection execution unit, the average frame length of each control block and the SV heartbeat message period.

[0218] Optionally, the data flow estimation module 320 includes:

[0219] Determine the ARP message parameter unit, which is used to determine the frame length of the ARP message and the number of station control layer devices;

[0220] The ARP message flow estimation unit is used to estimate the data flow of the ARP message of the station control layer network according to the frame length of the ARP message and the number of station control layer devices.

[0221] A substation data flow estimation system 400 according to an embodiment of the present invention corresponds to a substation data flow estimation method 100 according to another embodiment of the present invention, and details thereof will not be repeated herein.

[0222] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal translation scripting language JavaScript, etc.

[0223] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0224] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0225] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0226] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0227] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for estimating substation data flow, characterized in that: The method comprises: Determine the secondary equipment configuration of the substation based on the scale of outgoing lines of the substation; According to the secondary equipment configuration of the substation, estimate the normal data flow and burst data flow of DL / T 860 communication messages of the station control layer network, estimate the normal data flow and burst data flow of PMU communication messages based on the secondary equipment configuration, estimate the data flow between the station control layer host and the integrated application server based on the secondary equipment configuration, estimate the normal data flow and burst data flow of the measurement and control device GOOSE based on the secondary equipment configuration, estimate the normal data flow and burst data flow of the protection device GOOSE based on the secondary equipment configuration, estimate the data flow of SNTP messages of the station control layer network based on the secondary equipment configuration, estimate the data flow of ARP messages of the station control layer network based on the secondary equipment configuration, and / or estimate the data flow of the acquisition and execution unit based on the secondary equipment configuration; Based on the secondary equipment configuration of the substation, estimate the normal data flow and burst data flow of the station control layer network DL / T 860 communication message, including: Determine the number of station control layer devices as M and the number of bay layer devices as N; Determine the normal data flow of messages between the bay layer and the station control layer according to the number M of the station control layer devices and the number N of the bay layer devices; Determine the burst data flow of messages between the bay layer and the station control layer according to the number M of the station control layer devices and the number N of the bay layer devices; Based on the secondary equipment configuration of the substation, estimate the normal data flow and burst data flow of the PMU communication message, including: Determine the frame length, phasor, analog quantity, switch quantity and frame rate of PMU communication message; estimating a normal data flow of the PMU communication message according to a frame length, a phasor, an analog quantity, a switching quantity, and a frame rate of the PMU communication message; estimating that the burst data flow of the PMU communication message is zero; According to the secondary equipment configuration of the substation, the normal data flow and burst data flow of the measurement and control device GOOSE and the normal data flow and burst data flow of the protection device GOOSE are estimated, including: Estimate the normal data flow of the GOOSE measurement and control device based on the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device; Estimate the burst data traffic of the GOOSE device based on the GOOSE message frame length and GOOSE time window of the measurement and control device; Estimate the normal data flow of the protection device GOOSE based on the GOOSE message frame length and GOOSE heartbeat message period of the protection device; Estimate the burst data traffic of the protection device GOOSE based on the GOOSE message frame length and GOOSE time window; Based on the secondary equipment configuration of the substation, estimate the data flow of SNTP messages in the station control layer network, including: Estimate the data flow of SNTP messages on the station control layer network based on the frame length and heartbeat period of the SNTP messages on the station control layer network and the number of devices on the station control layer. Estimate the data traffic of ARP packets on the station control layer network, including: Determine the frame length of the ARP message and the number of station control layer devices; Estimate the data flow of the ARP message of the station control layer network based on the frame length of the ARP message and the number of station control layer devices; According to the secondary equipment configuration of the substation, the data flow of the acquisition execution unit is estimated, including: According to the number of control blocks of the acquisition execution unit, the average frame length of each control block and the GOOSE heartbeat message period, the data flow of the acquisition execution unit to send GOOSE is estimated; The data flow of the SV sent by the collection execution unit is estimated according to the number of control blocks of the collection execution unit, the average frame length of each control block, and the SV heartbeat message period.

2. A substation data flow estimation system, characterized in that: The system comprises: The module for determining the secondary equipment configuration is used to determine the secondary equipment configuration of the substation according to the scale of the substation outgoing lines; a data flow estimation module, configured to estimate, based on the secondary equipment configuration of the substation, the normal data flow and burst data flow of DL / T 860 communication messages of the station control layer network, the normal data flow and burst data flow of PMU communication messages according to the secondary equipment configuration, the data flow between the station control layer host and the integrated application server according to the secondary equipment configuration, the normal data flow and burst data flow of the measurement and control device GOOSE according to the secondary equipment configuration, the normal data flow and burst data flow of the protection device GOOSE according to the secondary equipment configuration, the data flow of SNTP messages of the station control layer network according to the secondary equipment configuration, the data flow of ARP messages of the station control layer network according to the secondary equipment configuration, and / or the data flow of the acquisition and execution unit according to the secondary equipment configuration; Data traffic estimation module, including: Determine the equipment unit, which is used to determine the number of station control layer equipment as M and the number of bay layer equipment as N within the same network; A unit for determining a normal flow rate of DL / T 860 communication messages is configured to determine a normal data flow rate of messages between the bay layer and the station control layer based on the number M of devices in the station control layer and the number N of devices in the bay layer; A DL / T 860 communication message burst flow determination unit is configured to determine a burst data flow of messages between the bay layer and the station control layer based on the number M of station control layer devices and the number N of bay layer devices; Data traffic estimation module, including: Determine the PMU communication message parameter unit, used to determine the frame length, phasor, analog quantity, switch quantity and frame rate of the PMU communication message; a PMU communication message normal flow estimating unit, configured to estimate the normal data flow of the PMU communication message according to the frame length, phasor, analog quantity, switch quantity, and frame rate of the PMU communication message; a PMU communication message burst flow estimation unit, configured to estimate the burst data flow of the PMU communication message to be zero; Data traffic estimation module, including: The normal flow estimation unit of the measurement and control device is used to estimate the normal data flow of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the measurement and control device; The measurement and control burst traffic estimation unit is used to estimate the burst data traffic of the measurement and control device GOOSE according to the GOOSE message frame length and GOOSE time window of the measurement and control device; The protection normal traffic estimation unit is used to estimate the normal data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE heartbeat message period of the protection device; The protection burst traffic estimation unit is used to estimate the burst data traffic of the protection device GOOSE according to the GOOSE message frame length and GOOSE time window of the protection device; Data traffic estimation module, including: The SNTP message flow estimation unit is used to estimate the data flow of the SNTP message of the station control layer network based on the frame length of the SNTP message of the station control layer network, the heartbeat message period of the SNTP message of the station control layer network, and the number of station control layer devices; Data traffic estimation module, including: Determine the ARP message parameter unit, which is used to determine the frame length of the ARP message and the number of station control layer devices; An ARP message flow estimation unit, configured to estimate the data flow of the ARP message of the station control layer network according to the frame length of the ARP message and the number of station control layer devices; Data traffic estimation module, including: The estimation collection execution unit sends the GOOSE unit, which is used to estimate the data flow of the collection execution unit sending GOOSE according to the number of control blocks of the collection execution unit, the average frame length of each control block and the GOOSE heartbeat message period; The SV sending unit of the collection execution unit is estimated to estimate the data flow of the SV sent by the collection execution unit according to the number of control blocks of the collection execution unit, the average frame length of each control block and the SV heartbeat message period.

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