Power station automation system and electric energy acquisition method

Abstract

The invention discloses a power station automation system which comprises a station control layer, a spacing layer and a process layer, the station control layer is connected with the spacing layer through a station control layer network, the spacing layer is connected with the process layer through a process layer network, and the process layer is connected with primary equipment. The invention further discloses an electric energy obtaining method. According to the power station automation system and the electric energy acquisition method, the problem that the electric quantity of an unattended power station in a remote area cannot be acquired in real time is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric energy detection, and in particular relates to a power station automation system, and also relates to an electric energy acquisition method using the power station automation system. Background Art

[0002] The electric energy remote terminals of thermal power plants, hydropower stations, new energy power stations, and substations are usually configured with 0.2S metering-level gateway electric energy meters in the main / slave meter mode, connected to the electric energy metering system via serial ports, and communicate with the electric energy master station through the power dispatching data network.

[0003] The gateway energy meter is not connected to the power plant automation system, and the gateway energy meter information cannot be obtained from the power plant automation system and equipment. At present, the power plant owner can only obtain the gateway energy meter data such as total forward active energy, total reverse active energy, active energy (peak), active energy (flat), active energy (valley), etc. by directly contacting the gateway energy meter. Therefore, there are many inconveniences in the statistical reporting of power consumption in remote areas and unattended power stations. The traditional gateway energy meter reading method has problems such as low efficiency and high labor costs, and can no longer meet the development needs of modern power systems. Therefore, it is of great significance to study an efficient, accurate and safe remote meter reading technology. The shortcomings of manual meter reading at the gateway energy meter mainly include the following aspects: 1. Low efficiency: Manual meter reading requires staff to read the data of each energy meter one by one and record it. This process is time-consuming and labor-intensive, inefficient, and cannot meet the needs of large-scale and efficient meter reading. 2. Error-prone: During manual meter reading, due to human factors such as poor eyesight and lack of concentration, data reading errors may occur. In addition, handwritten records may also have problems such as blurred handwriting and confusion of numbers, further increasing the probability of errors. 3. High cost: Manual meter reading requires a large amount of human resources, including meter readers and management personnel. The wages and benefits of these personnel are high, which increases the operating costs of enterprises. In particular, the current management mode of new energy stations is "centralized monitoring, few people on duty, regional operation and maintenance, and professional maintenance", especially some stations are located in remote areas, and the local unmanned mode is unattended. 4. Poor data security: During manual meter reading, meter readers need to directly contact the energy meter and data, and there is a risk of data leakage and tampering. In addition, paper records are also prone to loss and damage, resulting in data loss or incompleteness. In order to be able to grasp the daily online power of new energy stations, remote meter reading of gateway meters is a requirement for the high automation of new energy stations. Summary of the invention

[0004] The first object of the present invention is to provide a power plant automation system to solve the problem that the power consumption of unmanned power plants in remote areas cannot be obtained in real time.

[0005] The second aspect of the present invention is to provide a method for obtaining electric energy.

[0006] The first technical solution adopted by the present invention is that the power station automation system includes a station control layer, an interval layer and a process layer. The station control layer is connected to the interval layer through a station control layer network, the interval layer is connected to the process layer through a process layer network, and the process layer is connected to the electrical primary equipment.

[0007] The first technical solution of the present invention is also characterized in that: The station control layer includes a protection information management device, a first server, a second server, a first monitoring machine, a second monitoring machine, a remote communication device and a clock synchronization device. The protection information management device, the first server, the second server, the first monitoring machine, the second monitoring machine, the remote communication device and the clock synchronization device are respectively connected to the station control layer network.

[0008] The interval layer includes a measurement and control device, a recording device, a protection device and a serial port device. The measurement and control device, the recording device, the protection device and the serial port device are respectively connected to the station control layer network and the process layer network. The serial port device is connected to an infrared meter converter.

[0009] The process layer includes terminal devices and merging units, which are respectively connected to the process layer network; the primary equipment includes switchgear and electronic transformers, the terminal devices are connected to the switchgear, and the merging units are connected to the electronic transformers.

[0010] The station control layer network adopts the MMS protocol, and the process layer network adopts the GOOSE protocol and the SV protocol.

[0011] The second technical solution adopted by the present invention is a method for obtaining electric energy. The power data of the power meter at the gateway is obtained through the infrared meter reader, and the server receives the power data obtained by the serial port device to complete the contactless power acquisition.

[0012] The second technical solution of the present invention is also characterized in that: The communication mode of the infrared meter reader is RS485 serial port communication.

[0013] The beneficial effects of the present invention are: (1) The power plant automation system and electric energy acquisition method provided by the present invention remotely transmit the gateway electric energy meter information through the power plant automation system isolation layer equipment, obtain the gateway electric energy meter data in a non-contact manner, and realize remote real-time acquisition of power consumption in remote areas and unmanned power stations.

[0014] (2) The power plant automation system and power acquisition method provided by the present invention use infrared rays as information carriers to transmit data between devices. Its characteristics include fast transmission speed, high security, and no need for line laying. In addition, infrared communication is directional, which can effectively avoid signal interference and improve communication quality.

[0015] (3) In the power plant automation system and electric energy acquisition method provided by the present invention, infrared communication technology can replace the traditional wired connection method in the remote meter reading of the gateway electric energy meter to achieve contactless data transmission. Specifically, the equipment configuration is: an infrared transmitter is installed on the gateway electric energy meter, and an infrared receiver is configured on the meter reading device. Data transmission: When the meter reading device is close to the gateway electric energy meter, the infrared transmitter sends the electric energy meter data in the form of an infrared signal, and the infrared receiver of the meter reading device receives the signal and parses it. Data processing: The meter reading device processes the received data, such as storing, analyzing or uploading it to a server.

[0016] (4) The power plant automation system and electric energy acquisition method provided by the present invention are highly efficient: infrared communication is fast and can quickly complete data transmission; safe: infrared communication is directional and not easily intercepted, which improves the security of data transmission; economical: no need to lay lines, which reduces hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a flow chart of the power station automation system of the present invention.

[0018] In the figure, 1. protection information management device, 2. first server, 3. second server, 4. first monitoring machine, 5. second monitoring machine, 6. remote communication device, 7. clock synchronization device, 8. measurement and control device, 9. recording device, 10. protection device, 11. serial port device, 12. terminal device, 13. merging unit. DETAILED DESCRIPTION

[0019] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] The power station automation system provided by the present invention is as follows: Figure 1As shown, the power station automation system consists of "three layers and two networks". The three layers include the station control layer, the interval layer and the process layer. The two networks include the station control layer network between the station control layer and the interval layer, and the process layer network between the interval layer and the process layer. The station control layer is connected to the interval layer through the station control layer network, the interval layer is connected to the process layer through the process layer network, and the process layer is connected with electrical primary equipment. The station control layer includes a protection information management device 1, a first server 2, a second server 3, a first monitoring machine 4, a second monitoring machine 5, a telecontrol communication device 6 and a clock synchronization device 7, and the protection information management device 1, the first server 2, the second server 3, the first monitoring machine 4, the second monitoring machine 5, the telecontrol communication device 6 and the clock synchronization device 7 are respectively connected to the station control layer network; the interval layer includes a measurement and control device 8, a recording device 9, a protection device 10 and a serial port device 11, and the measurement and control device 8, the recording device 9, the protection device 10 and the serial port device 11 are respectively connected to the station control layer network and the process layer network, and the serial port device 11 is connected to an infrared meter reader; the process layer includes a terminal device 12 and a merging unit 13, and the terminal device 12 and the merging unit 13 are respectively connected to the process layer network; the electrical primary equipment includes a switchgear and an electronic transformer, the terminal device 12 is connected to the switchgear, and the merging unit 13 is connected to the electronic transformer; the station control layer network adopts the MMS protocol, and the process layer network adopts the GOOSE protocol and the SV protocol.

[0021] The station control layer network uses MMS (manufacturing message specification), and the process layer network uses GOOSE (generic object-oriented power station event) and SV (sampling). Except for the point-to-point transmission of protection device direct sampling and direct tripping, voltage measurement, and metering SV sampling messages, the rest of the process layer SV / GOOSE messages are networked and transmitted, and SV / GOOSE share the same network. The station control layer provides a human-machine interface for station operation monitoring and control, realizes the management and control functions of equipment such as the interval layer and process layer, and communicates with the dispatching and control center. The interval layer is composed of protection devices, measurement and control devices, recording devices, communication management devices, etc. In the event of failure of the station control layer and the station control layer network, it can still independently complete the on-site functions of the interval layer equipment. The process layer is composed of merging units, terminal devices, etc., and completes functions related to primary equipment, including the collection of real-time electrical quantities, monitoring of equipment operating status, and execution of control commands.

[0022] The present invention also provides a method for obtaining electric energy, using a power station automation system, specifically: obtaining the power data of the electric energy meter at the gateway through an infrared meter reader, and the server receiving the power data obtained by the serial port device to complete non-contact electric energy acquisition; the communication mode of the infrared meter reader is RS485 serial port communication.

[0023] Example 1 This embodiment provides a power station automation system, such as Figure 1As shown, it includes a station control layer, an interval layer and a process layer. The station control layer is connected to the interval layer through a station control layer network, the interval layer is connected to the process layer through a process layer network, and the process layer is connected to electrical primary equipment.

[0024] Example 2 This embodiment provides a power station automation system, such as Figure 1 As shown, it includes a station control layer, an interval layer and a process layer. The station control layer is connected to the interval layer through a station control layer network, the interval layer is connected to the process layer through a process layer network, the process layer is connected with electrical primary equipment, the interval layer is connected to the process layer through a process layer network, and the process layer is connected with primary equipment; the station control layer includes a protection information management device 1, a first server 2, a second server 3, a first monitoring machine 4, a second monitoring machine 5, a telecontrol communication device 6 and a clock synchronization device 7, and the protection information management device 1, the first server 2, the second server 3, the first monitoring machine 4, the second monitoring machine 5, the telecontrol communication device 6 and the clock synchronization device 7 are respectively connected to the station control layer network.

[0025] Example 3 This embodiment provides a power station automation system, such as Figure 1 As shown, it includes a station control layer, an interval layer and a process layer. The station control layer is connected to the interval layer through a station control layer network, the interval layer is connected to the process layer through a process layer network, the process layer is connected to a primary device, the interval layer is connected to the process layer through a process layer network, and the process layer is connected to a primary device; the station control layer includes a protection information management device 1, a first server 2, a second server 3, a first monitoring machine 4, a second monitoring machine 5, a telecontrol communication device 6 and a clock synchronization device 7, the protection information management device 1, the first server 2, the second server 3, the first monitoring machine 4, the second monitoring machine 5, the telecontrol communication device 6 and the clock synchronization device 7 are respectively connected to the station control layer network, The interval layer includes a measurement and control device 8, a recording device 9, a protection device 10 and a serial port device 11. The measurement and control device 8, the recording device 9, the protection device 10 and the serial port device 11 are connected to the station control layer network and the process layer network respectively. The serial port device 11 is connected to an infrared meter reader. The process layer includes a terminal device 12 and a merging unit 13. The terminal device 12 and the merging unit 13 are connected to the process layer network respectively. The electrical primary equipment includes a switchgear and an electronic transformer. The terminal device 12 is connected to the switchgear, and the merging unit 13 is connected to the electronic transformer. The station control layer network adopts the MMS protocol, and the process layer network adopts the GOOSE protocol and the SV protocol. Among them, the infrared meter reader adopts a high-performance ARM CPU microprocessor, with a built-in infrared emission LED and an integrated infrared receiver, which can stably read the meter data. At the same time, it has a protocol conversion function to convert the meter's DL / T698 and DL / T645 to the universal Modbus-RTU protocol. The infrared meter reader uses an RS485 communication interface to lead out and can be connected to the data acquisition gateway. The parameters of the infrared meter reading converter are shown in Table 1: Table 1 Infrared meter reader parameters

[0026] The specific method of obtaining electric energy is as follows: The serial port device 11 plug-in of the interval layer of the power station automation system provides serial port access to the outside world and supports Modbus protocol parsing for access by other devices. The infrared meter reader is now connected to the serial port device 11 through the RS485 serial port communication method. The infrared acquisition mode of the infrared meter reader is the real-time acquisition mode. The configuration register address is 50. The register value is 0, indicating that the user reads the data of the corresponding register through the Modbus RTU protocol. The infrared head reads a piece of data from the meter according to the virtually mapped register address and returns the Modbus RTU protocol message through the 485 line. The infrared meter reader uses ModbusRTU as the uplink communication protocol, and the register uses the big-endian data format. The default communication parameters of Modbus RTU are shown in Table 2: Table 2 Modbus RTU default communication parameters

[0027] Taking the gateway energy meter of DL / T645-1997 protocol as an example, referring to Table 3, it can be seen that the Modbus register address corresponding to the total active energy of the gateway energy meter of DL / T645-1997 protocol is 1000, which occupies 2 registers. The gateway energy meter is equipped with an infrared transmitter, and the register mapping table is shown in Table 4, which is 4 bytes, and the data type is 32-bit unsigned integer (big endian). After configuring the above parameters in the serial port device 11, the power data can be obtained. Add the read power data telemetry information in the station control layer server configuration database, and the gateway energy meter data can be displayed in real time on the rear monitoring host. The gateway energy meter data is transmitted remotely through the telecontrol communication device to realize non-contact acquisition of power information across stations and regions.

[0028] Table 3DL / T645-1997 protocol power information register mapping table

[0029] Table 4DL / T645-1997 protocol power information register mapping table

Claims

1. Power plant automation system, characterized in that: It includes a station control layer, an interval layer and a process layer. The station control layer is connected to the interval layer through a station control layer network, the interval layer is connected to the process layer through a process layer network, and the process layer is connected with electrical primary equipment.

2. The power plant automation system according to claim 1, characterized in that: The station control layer comprises a protection information management device (1), a first server (2), a second server (3), a first monitoring machine (4), a second monitoring machine (5), a remote communication device (6) and a clock synchronization device (7); the protection information management device (1), the first server (2), the second server (3), the first monitoring machine (4), the second monitoring machine (5), the remote communication device (6) and the clock synchronization device (7) are respectively connected to the station control layer network.

3. The power plant automation system according to claim 2, characterized in that: The spacing layer comprises a measurement and control device (8), a wave recording device (9), a protection device (10) and a serial port device (11); the measurement and control device (8), the wave recording device (9), the protection device (10) and the serial port device (11) are respectively connected to a station control layer network and a process layer network; and the serial port device (11) is connected to an infrared meter reader.

4. The power plant automation system according to claim 1, characterized in that: The process layer comprises a terminal device (12) and a merging unit (13), wherein the terminal device (12) and the merging unit (13) are respectively connected to the process layer network; the electrical primary equipment comprises a switch device and an electronic transformer, wherein the terminal device (12) is connected to the switch device, and the merging unit (13) is connected to the electronic transformer.

5. The power plant automation system according to claim 1, characterized in that: The station control layer network adopts the MMS protocol, and the process layer network adopts the GOOSE protocol and the SV protocol.

6. A method for obtaining electric energy, characterized in that: The power plant automation system as claimed in claims 1 to 5 is implemented in the following steps: The infrared meter reader is used to obtain the electric power data of the electric power meter at the gateway, and the server receives the electric power data obtained by the serial port device (11), thereby completing contactless electric power acquisition.

7. The power plant automation system according to claim 1, characterized in that: The infrared meter reader communication mode is RS485 serial communication.

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