A smart substation system architecture based on independent networking structure

Abstract

The present invention discloses an intelligent substation system architecture based on an independent networking structure, comprising a separately arranged protection network and an automation network, as well as a plurality of single-bay protection devices, cross-bay protection devices, a first intelligent component, a measurement and control device, and a second intelligent component. The protection network has a dual-network redundant structure, while the automation network has a single-network structure. The single-bay protection devices and cross-bay protection devices are connected to the redundant dual networks in the protection network. The first intelligent component is connected to the redundant dual networks in the protection network, and the first intelligent component transmits samples, signals, and control commands corresponding to the cross-bay protection devices. The measurement and control devices and the second intelligent component are connected to the automation network, and the second intelligent component transmits samples, signals, control, and locking commands related to the measurement and control devices. The present invention divides the existing process layer network into mutually independent protection and automation networks, effectively reducing the impact of merging unit intelligent terminal failures on the secondary system and improving the operational reliability of the secondary system.

Description

Technical Field

[0001] The present invention belongs to the field of power system automation, and in particular relates to an intelligent substation system architecture based on an independent networking structure. Background Art

[0002] In recent years, the technology of intelligent substation in power system has developed rapidly. State Grid Corporation of China has gradually formed a system architecture based on IEC61850 standardized network communication, with high sharing of protection, control and automation monitoring information. Figure 1 shown.

[0003] However, some problems have been found in the operation of current smart substations:

[0004] (1) The highly integrated process layer network adopts a dual-single network mode. Although it ensures the mutual independence of the dual equipment networks, each set of equipment is only connected to one network, there is no redundant backup, and the reliability is not high.

[0005] (2) In the process layer network of the smart substation, the switch serves as an information hub and is connected to various secondary devices. The data flow is large and involves a wide range. In the event of a fault, it will simultaneously affect all related secondary devices such as measurement and control, protection and safety automatic devices.

[0006] (3) The information collection and control of secondary equipment is processed by the merging unit and intelligent terminal. Failure of the merging unit intelligent terminal will directly affect the reliability of the protection and monitoring system. In particular, the busbar failure protection, which serves as a backup for line protection, is sampled from the same secondary winding and the same merging unit data, which has a significant impact on the reliability of the protection.

[0007] Therefore, how to optimize the network architecture of secondary equipment in smart substations and improve the operational reliability of protection and automation systems is a problem that needs to be solved at present. Summary of the Invention

[0008] In response to the above problems, the present invention proposes an intelligent substation system architecture based on an independent networking structure, which divides the current process layer network into mutually independent protection network and automation network. It can effectively reduce the impact of the failure of the intelligent terminal of the merging unit on the secondary system and improve the operational reliability of the secondary system.

[0009] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0010] A smart substation system architecture based on an independent networking structure includes:

[0011] Separate protection private network and automation private network, the protection private network has a dual-network redundant structure, and the automation private network has a single-network structure;

[0012] Several single-bay protection devices, each of which is connected to a redundant dual network in the protection private network;

[0013] A plurality of cross-bay protection devices and a first intelligent component, each cross-bay protection device and the first intelligent component are respectively connected to a redundant dual network in the protection dedicated network, and the first intelligent component is used to transmit samples, signals and control commands corresponding to the cross-bay protection device;

[0014] The measurement and control equipment and the second intelligent component are respectively connected to the automation private network, and the second intelligent component is used to transmit sampling, signals, control and locking commands related to the measurement and control equipment.

[0015] Optionally, if there are dual-configuration single-bay protection devices, cross-bay protection devices, and first intelligent components, the dual-configuration devices are respectively connected to different protection-specific networks.

[0016] Optionally, the first intelligent component is connected to the redundant dual network in the protection private network via optical fiber.

[0017] Optionally, the second intelligent component is connected to the automation private network via an optical fiber.

[0018] Optionally, the single-bay protection device is a line protection device or a busbar protection device.

[0019] Optionally, the cross-bay protection device is a busbar protection device, a main transformer protection device or a fault recording device.

[0020] Optionally, the intelligent substation system architecture based on an independent networking structure further includes metering equipment, synchronous phasor measurement equipment and automation equipment, and the metering equipment, synchronous phasor measurement equipment and automation equipment are all connected to the automation private network.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention divides the existing process layer network into independent protection and automation networks, and uses independent equipment to complete data acquisition and control of protection equipment and automation equipment. This avoids the previous method in which all acquisition and control of secondary equipment in smart substations must pass through the merging unit intelligent terminal, reduces dependence on the merging unit intelligent terminal, and improves the operational reliability of the secondary system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0024] Figure 1It is the typical system architecture of the current intelligent substation

[0025] Figure 2 This is a schematic diagram of the dedicated network architecture for protection equipment of the present invention;

[0026] Figure 3 This is a schematic diagram of the automation equipment automation network architecture of the present invention;

[0027] Figure 4 This is a schematic diagram of the intelligent substation system architecture based on an independent networking structure of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of protection of the present invention.

[0029] The application principle of the present invention is described in detail below with reference to the accompanying drawings.

[0030] In order to optimize the network architecture of secondary equipment in smart substations and improve the operational reliability of protection and automation systems, the present invention proposes to divide the current process layer network into independent protection networks and automation networks, and use independent equipment to complete data collection and control of protection equipment and automation equipment. This avoids the previous method of collecting and controlling all secondary equipment in smart substations through the intelligent terminal of the merging unit, reduces dependence on the intelligent terminal of the merging unit, and improves the operational reliability of the secondary system.

[0031] like Figure 2-4 As shown in FIG, a smart substation system architecture based on an independent networking structure includes:

[0032] The protection private network and the automation private network are separately set up, that is, there is no connection between the protection private network and the automation private network. The protection private network has a dual-network redundant structure, and the automation private network has a single-network structure;

[0033] Several single-bay protection devices are connected to the redundant dual network in the protection network. That is, each single-bay protection device is connected to the same redundant dual network at the same time. If there are single-bay protection devices with duplicate configuration, the single-bay protection devices with duplicate configuration are connected to different redundant dual networks respectively.

[0034] A plurality of cross-bay protection devices and first intelligent components, each of which is connected to a redundant dual network in the protection private network. The first intelligent component is used to transmit sampling, signals, and control commands corresponding to the cross-bay protection device, that is, the protection private network is only connected to protection, recording, and intelligent components dedicated to protection devices; if there are cross-bay protection devices and first intelligent components with a dual configuration, then the cross-bay protection devices and first intelligent components with a dual configuration are respectively connected to different redundant dual networks;

[0035] A measurement and control device and a second intelligent component, wherein the measurement and control device and the second intelligent component are respectively connected to the automation private network, and the second intelligent component is used to transmit sampling, signals, control and locking commands related to the measurement and control device;

[0036] In a specific implementation of an embodiment of the present invention, the first intelligent component is connected to the redundant dual network in the protection private network through optical fiber, and the first intelligent component also cooperates with the primary equipment through a cable; the second intelligent component is connected to the automation private network through optical fiber, and the second intelligent component also cooperates with the primary equipment through a cable.

[0037] In a specific implementation of an embodiment of the present invention, the single-interval protection device is a line protection device or a busbar protection device; the cross-interval protection device is a busbar protection device, a main transformer protection device, and a fault recording device; the intelligent substation system architecture based on an independent networking structure also includes metering equipment, synchronous phasor measurement equipment and automation equipment, and the metering equipment, synchronous phasor measurement equipment, and automation equipment are connected to the automation private network.

[0038] In a specific implementation of an embodiment of the present invention, if there is a single-interval protection device or a cross-interval protection device with a dual configuration, the single-interval protection device or the cross-interval protection device with a dual configuration is respectively connected to different protection private networks. For example, the dual-configuration protection device and the first intelligent component are divided into two sets, A and B, and the corresponding protection private networks are A1 / A2 and B1 / B2. The protection private networks A and B are both redundantly configured, and the A set of protection devices and the corresponding first intelligent components are connected to the protection private network A1 / A2, and the B set of protection devices and the corresponding first intelligent components are connected to the protection private network B1 / B2, ensuring that any device is connected to the redundant network and ensuring the reliability of the network loop. There is no connection between the protection private networks A1 / A2 and B1 / B2, ensuring the complete independence of the A / B dualized device loops.

[0039] like Figure 2 and 4The diagram shows the architecture of a dedicated protection network system. Single-bay protection devices directly use cables to connect to primary equipment, such as line protection devices. The first intelligent component dedicated to these protection devices only transmits sampling, signaling, and control commands for cross-bay protection devices. The sampling, signaling, and control of single-bay protection devices are implemented using different equipment and circuits. The first intelligent component connects to the primary equipment via cables and accesses the dedicated protection network via optical fiber. For example, sampling, signaling, and control of cross-bay busbar protection are implemented using the first intelligent component in each bay, while single-bay line protection directly connects to the primary equipment via cables for sampling, signaling, and control. The sampling, signaling, and control of cross-bay busbar protection and single-bay line protection use different circuits to ensure they do not affect each other. This improves the reliability of the protection system.

[0040] like Figure 3 and 4 The automation private network system architecture shown in the figure connects only to measurement and control equipment, metering equipment, synchronized phasor measurement equipment, and the dedicated second intelligent component for automation equipment. The automation private network is a single-network design, with all equipment connected to the same network. The dedicated second intelligent component for automation equipment only transmits sampling, signals, control, and blocking commands related to automation equipment. The second intelligent component connects to primary equipment via cables and is connected to the automation private network via optical fiber. The dedicated second intelligent component for automation equipment and the dedicated first intelligent component for protection equipment are separate devices and connected to different networks to ensure the independence of data collection, execution, and networking for protection and automation equipment.

[0041] like Figure 4 The intelligent substation system architecture shown is based on an independent networking structure. The automation system and the protection system are completely independent, and there is no connection between analog sampling, signal acquisition, command control, network loop, and intelligent component settings. The protection dedicated network adopts a dual redundant configuration to meet the dual protection requirements, and the automation dedicated network adopts a single network configuration to match the single-configuration automation equipment. Single-interval protection uses cables to directly cooperate with primary equipment, and intelligent components use cables to cooperate with primary equipment to ensure the independent reliability of the data source; cross-interval protection equipment and automation equipment cooperate with corresponding intelligent components through protection dedicated networks and automation dedicated networks to achieve data sharing. The intelligent substation system architecture of the present invention realizes the distinction between protection and automation equipment, and the distinction between single-interval protection and cross-interval protection through an independent networking structure, while improving reliability and realizing the sharing of secondary equipment networks.

[0042] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A smart substation system architecture based on an independent networking structure, characterized in that: include: Divide the process layer network into a protection private network and an automation private network that are independent of each other, wherein the protection private network has a dual-network redundant structure and the automation private network has a single-network structure; Several single-bay protection devices, each of which is connected to a redundant dual network in the protection private network; A plurality of cross-bay protection devices and a first intelligent component, each cross-bay protection device and the first intelligent component are respectively connected to a redundant dual network in the protection dedicated network, and the first intelligent component is used to transmit samples, signals and control commands corresponding to the cross-bay protection device; A measurement and control device and a second intelligent component, wherein the measurement and control device and the second intelligent component are respectively connected to the automation private network, and the second intelligent component is used to transmit sampling, signals, control and locking commands related to the measurement and control device; Use independent equipment to complete data collection and control of protection equipment and automation equipment; Cross-interval protection equipment and automation equipment achieve data sharing through the protection dedicated network, automation dedicated network and corresponding intelligent components.

2. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized by: If there are single-bay protection devices, cross-bay protection devices, and first intelligent components with dual configurations, the dual configuration devices are respectively connected to different protection private networks.

3. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized by: The first intelligent component is connected to the redundant dual network in the protection private network through optical fibers.

4. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized in that: The second intelligent component is connected to the automation private network via an optical fiber.

5. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized in that: The single-bay protection device is a line protection device or a busbar protection device.

6. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized in that: The cross-bay protection device is a busbar protection device, a main transformer protection device or a fault recording device.

7. The smart substation system architecture based on an independent networking structure according to claim 1 is characterized in that: It also includes metering equipment, synchronized phasor measurement equipment and automation equipment, and the metering equipment, synchronized phasor measurement equipment and automation equipment are all connected to the automation private network.

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