CN103605105A - Smart substation digital energy meter calibration device - Google Patents

Abstract

The invention provides a calibration device for a digital electric energy meter of an intelligent substation, which comprises a main control unit, a high-speed data processing unit, a network management unit, an FPGA unit, a touch display screen, a key unit and a power supply management unit, wherein the main control unit is connected with the high-speed data processing unit; the main control unit is respectively electrically connected with the high-speed data processing unit and the touch display screen through bidirectional signals; the main control unit is in signal electrical connection with the key unit; the high-speed data processing unit is also electrically connected with the network management unit and the FPGA unit in a bidirectional signal mode respectively; the power management unit is used for providing working power. The multi-core framework is real-time and efficient in detection and calibration, high in detection precision, friendly in operation interface, rich in interfaces, convenient to access in a calibration site, time-saving and labor-saving, simple in structure, low in cost and convenient to use, and solves the problem that optical fiber digital signals cannot be simultaneously accessed under the condition of on-site real load calibration.

Description

Smart substation digital energy meter calibration device

technical field

The invention relates to the technical field of measurement and detection of intelligent substations in power supply systems, in particular to a digital electric energy meter calibration device for verifying and testing three-phase electronic multifunctional electric energy meters in intelligent substations based on the IEC6185 standard.

Background technique

Smart substation is an important part of smart grid construction. Digitalization and intelligence of substations have become a trend. Different from traditional substations, digital substations adopt a three-layer structure of process layer, interval layer and station control layer based on the IEC61850 standard. , all electrical measurements are converted into digital signals conforming to the IEC61850 9-1, 9-2 protocol at the process layer, and then transmitted to the process layer or bay layer equipment through optical fiber Ethernet. Smart substations need to use more digital energy meters for measurement, and the digital energy meters used in them need to be checked for their errors in the laboratory and when they are installed in the smart substation for real-load operation. Traditional electric energy meters have relatively mature calibration equipment and relatively complete verification procedures and methods; compared with traditional electric energy meters, digital electric energy meters have undergone major changes in their measurement principles and methods, and are no longer traditional Relying on analog quantity acquisition, but based on the IEC61850 standard framework, the metering function is completed through the acquisition of digital signals, and can communicate with other devices (such as background computer systems) through the network and other methods. At present, relatively mature calibration and detection devices or instruments that can perform high-precision detection and calibration of digital electric energy meters in the laboratory, especially in the field under real load conditions, are still rare.

Contents of the invention

The purpose of the present invention is to provide a smart substation digital electric energy meter calibration device with simple structure, low cost, abundant interfaces, high detection accuracy and convenient and fast connection during use.

The technical solution of the present invention is: the smart substation digital electric energy meter verification device of the present invention, its structural characteristics are: including a main control unit, a high-speed data processing unit, a network management unit, an FPGA unit, a touch display screen, a key unit and a power management unit unit;

The main control unit is provided with a first communication terminal, a second communication terminal, a display signal terminal and a key signal input terminal; the high-speed data processing unit is provided with first to fifth communication terminals; the network management unit is provided with a data signal communication terminal and a control signal terminal Communication terminal; the FPGA unit is provided with a data communication terminal; the touch screen is provided with a display signal terminal; the key unit is provided with a signal output terminal;

The first communication end of the main control unit is electrically connected with the first communication end of the high-speed data processing unit with bidirectional signals; the second communication end of the main control unit is electrically connected with the second communication end of the high-speed data processing unit with bidirectional signals; The display signal end is electrically connected to the display signal end of the touch screen with bidirectional signals; the key signal input end of the main control unit is electrically connected to the signal output end signal of the key unit; the third communication end of the high-speed data processing unit is connected to the data of the network management unit. The signal communication end is electrically connected with two-way signals; the fourth communication end of the high-speed data processing unit is electrically connected with the control signal communication end of the network management unit; the fifth communication end of the high-speed data processing unit is electrically connected with the data communication end of the FPGA unit. Connection; the power management unit is used to provide working power.

Further scheme is: above-mentioned main control unit comprises CPU module, flash memory module, SDRAM module, clock module, network interface module, communication interface module, USB interface module, display module and dual-port RAM module; CPU module is provided with communication terminal and The button signal input terminal; the display module and the dual-port RAM module are respectively provided with a first communication terminal and a second communication terminal;

The flash memory module, SDRAM module, clock module, network interface module, communication interface module and USB interface module of the main control unit are all electrically connected with the CPU module bidirectional signal; the first communication terminal of the display module and the first communication terminal of the dual-port RAM module Both ends are electrically connected with the CPU module bidirectional signal;

The communication end of the CPU module is the first communication end of the main control unit; the second communication end of the dual-port RAM module is the second communication end of the main control unit; the button signal input end of the CPU module is the key of the main control unit Signal input terminal; the second communication terminal of the display module is the display signal terminal of the main control unit.

A further solution is: the above-mentioned high-speed data processing unit includes a 32-bit DSP chip whose model is ADSP-BF518, and the main frequency is 400MHz.

A further solution is: the above-mentioned network management unit is equipped with ST optical fiber interface, SC optical fiber interface and RJ45 interface; wherein, ST optical fiber interface and SC optical fiber interface are respectively provided with 2; RJ45 interface is provided with 3.

A further solution is: the above-mentioned FPGA unit is provided with a high-frequency pulse output interface, a meter pulse input interface and an FT3 data interface.

The present invention has positive effects: (1) The smart substation digital electric energy meter verification device of the present invention adopts a multi-core architecture for data information processing of the main control unit, high-speed data processing unit and FPGA unit, and is used for real-time detection and verification to ensure The device detects the digital electric energy meter in real time and efficiently, and has high detection accuracy. (2) In the smart substation digital electric energy meter verification device of the present invention, the main control unit is provided with a network port, which facilitates communication with the background host computer during use; and a USB interface and an RS232 communication interface are provided to facilitate connection to peripheral devices. (3) In the smart substation digital electric energy meter calibration device of the present invention, the network management unit 3 is provided with an ST optical fiber interface 31, an SC optical fiber interface 32 and an RJ45 interface 33, which facilitates the connection with different optical fiber interfaces and network interfaces at the calibration site. It saves time and effort; at the same time, it solves the problem that the optical fiber digital signal cannot be connected at the same time in the case of on-site real load verification: the traditional on-site calibration can put the calibrator Connect with the energy meter in parallel, and simultaneously sample the voltage and current signals of the line for detection. In a digital substation, the merging unit generally sends 61850 messages to the digital electric energy meter point-to-point. The merging unit rarely has a dedicated test channel reserved for on-site verification. The present invention passes the data signal sent by the merging unit through the network management unit. Multi-port synchronous forwarding, to realize the synchronous data obtained by the calibration device and the digital electric energy meter, so that the dynamic accuracy measurement under the real load can be realized locally on the electric meter under inspection. (4) The smart substation digital electric energy meter calibration device of the present invention, through the setting of the touch display screen and the key unit, makes the control interface friendly and easy to use.

(5) The smart substation digital electric energy meter verification device of the present invention has a relatively simple structure and low cost.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

The reference signs in the above-mentioned accompanying drawings are as follows:

Main control unit 1, CPU module 11, flash memory module 12, SDRAM module 13, clock module 14, network interface module 15, communication interface module 16, USB interface module 17, display module 18, dual-port RAM module 19,

High-speed data processing unit 2,

Network management unit 3, ST optical fiber interface 31, SC optical fiber interface 32, RJ45 interface 33,

FPGA unit 4, high-frequency pulse output interface 41, meter pulse input interface 42, FT3 data interface 43,

touch screen 5,

key unit 6,

Power Management Unit 7.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

(Example 1)

See Fig. 1, the smart substation digital energy meter verification device of this embodiment is mainly composed of a main control unit 1, a high-speed data processing unit 2, a network management unit 3, an FPGA unit 4, a touch display screen 5, a key unit 6 and a power management unit Unit 7 is composed.

The main control unit 1 is provided with a first communication terminal, a second communication terminal, a display signal terminal and a key signal input terminal; the high-speed data processing unit 2 is provided with first to fifth communication terminals; the network management unit 3 is provided with a data signal communication terminal and control signal communication end; FPGA unit 4 is provided with data communication end; touch screen 5 is provided with display signal end; key unit 6 is provided with signal output end.

The first communication end of the main control unit 1 is electrically connected to the first communication end of the high-speed data processing unit 2 with a bidirectional signal; the second communication end of the main control unit 1 is electrically connected to the second communication end of the high-speed data processing unit 2 with a bidirectional signal; The display signal end of the main control unit 1 is electrically connected with the display signal end of the touch screen 5 with a bidirectional signal; the key signal input end of the main control unit 1 is electrically connected with the signal output end signal of the key unit 6; The three communication ends are electrically connected with the data signal communication end of the network management unit 3 with two-way signals; the fourth communication end of the high-speed data processing unit 2 is electrically connected with the control signal communication end of the network management unit 3 with two-way signals; The five communication terminals are electrically connected to the data communication terminal of the FPGA unit 4 with bidirectional signals; the power management unit 7 provides working power for each unit.

The main control unit 1 is mainly composed of a CPU module 11, a flash memory module 12, an SDRAM module 13, a clock module 14, a network interface module 15, a communication interface module 16, a USB interface module 17, a display module 18 and a dual-port RAM module 19. The CPU module 11 is provided with a communication terminal and a button signal input terminal; the display module 18 and the dual-port RAM module 19 are respectively provided with a first communication terminal and a second communication terminal.

The flash memory module 12, SDRAM module 13, clock module 14, network interface module 15, communication interface module 16 and USB interface module 17 of main control unit 1 are all electrically connected with CPU module 11 bidirectional signals respectively; The first communication end of display module 18 Each of the first communication terminals of the dual-port RAM module 19 is electrically connected to the CPU module 11 with bidirectional signals.

The communication terminal of CPU module 11 is the first communication terminal of main control unit 1; the second communication terminal of dual-port RAM module 19 is the second communication terminal of main control unit 1; the button signal input terminal of CPU module 11 is The key signal input terminal of the main control unit 1 ; the second communication terminal of the display module 18 is the display signal terminal of the main control unit 1 .

The core processing device of the CPU module 11 of the main control unit 1 is an ARM9 microprocessor with a main frequency of 200 MHz, and its serial port is used as the first communication terminal of the main control unit 1 . The flash memory module 12 preferably adopts a NORFlash flash memory chip, which is used to store information data such as basic parameters, configured test schemes, and test result reports. SDRAM module 13 is used for data storage and receiving calls. The clock module 14 provides a clock signal for the CPU module 11 . The network interface module 15 preferably adopts an RJ45 network interface, which can be used to realize communication with the host computer and connect a digital electric energy meter that supports the IEC61850 standard upload data function for model testing and data recall testing. The communication interface module 16 is provided with an RS232 maintenance port for maintaining the equipment. The USB interface module 17 is used to connect the U disk to realize the import and export of data and the access of devices such as keyboard and mouse. The display module 18 is used to drive the touch screen and realize information interaction. One end of the dual-port RAM module 19 is electrically connected with the CPU module 11 bidirectional signals, and the other end of the dual-port RAM module 19 is the second communication port of the main control unit 1, and the dual-port RAM module 19 is used to realize the CPU of the main control unit 1. Communication of a large amount of data between the module 11 and the high-speed data processing unit 2.

The high-speed data processing unit 2 is used for data processing. In this embodiment, the high-speed data processing unit 2 preferably adopts a 32-bit DSP chip whose model is ADSP-BF518, and the main frequency is 400 MHz.

The network management unit 3 is used to realize synchronous sending and receiving of data packets from different network interfaces and data forwarding and identification of different channels. The network management unit 3 is provided with ST optical fiber interface 31 , SC optical fiber interface 32 and RJ45 interface 33 , wherein ST optical fiber interface 31 and SC optical fiber interface 32 are respectively provided with two; RJ45 interface 33 is provided with three. Through the setting of various interfaces of the network unit 3, the access to different optical fiber interfaces and network interfaces at the calibration site is facilitated, and it is not necessary to perform interface conversion after the calibration site, which saves time and effort.

The FPGA unit 4 is used to realize the output of high-frequency pulses, the input of pulses of the digital electric energy meter to be detected, the capture of signals, and the encoding and decoding of signals. The FPGA unit 4 is provided with a high-frequency pulse output interface 41 , an electric meter pulse input interface 42 and an FT3 data interface 43 . Wherein, the high-frequency pulse output interface 41 outputs 1-way active pulse output and 1-way reactive pulse; when the meter pulse input interface 42 is in use, it receives the active pulse and reactive pulse of the digital electric energy meter; the FT3 data interface 43 sends the signal into or Send FPGA for decoding and encoding processing.

The so-called FPGA refers to the field programmable gate array. The so-called FT3 refers to a link layer transmission frame format, which is the frame format specified in the IEC60044-8 electronic current transformer standard.

The touch screen 5 preferably adopts a 7-inch color touch liquid crystal display, which is used for the input of parameter configuration information and the display of relevant information.

The key unit 6 is composed of 8 function keys. The function of the button unit 6 is to realize parameter configuration and control as an auxiliary means of the touch screen 5 .

The power management unit 7 is used to provide corresponding working power for each unit and each module of the device.

(Application example)

The calibration device for the digital electric energy meter of the smart substation in the foregoing embodiment 1 is used for verifying the accuracy and other functions of the digital input electric energy meter in the laboratory and on site under real load.

During laboratory verification, the main control unit 1 is connected to the host computer through the touch screen 5 or the network interface module 15 of the main control unit 1, and corresponding identification schemes are configured according to different requirements, such as current changes, power factor changes, and frequency changes. , voltage change, sampling point change, packet loss, network interruption, etc., to customize the influence of electric energy accuracy, the prepared plan is stored in the main control unit 1, and the transferred plan will automatically start to calculate according to the number of test circles and test volume during the test. Corresponding to the high-frequency pulse constant of the power and sending information such as voltage, current, frequency, angle, etc. to the high-speed data processing unit 2 (DSP) through the first communication terminal of the main control unit 1 (the serial communication port of the CPU module 11); The data processing unit 2 organizes IEC61850-9-1/9-2 or FT3 messages according to the parameters configured by the main control unit 1, and passes through various optical fiber interfaces ( ST optical fiber interface 31, SC optical fiber interface 32, RJ45 interface 33, etc.) send messages to the digital electric energy meter to be checked; Calculate the number of high-frequency pulses under the specified number of pulses according to the frequency and the number of test circles, and return it to the high-speed data processing unit 2 through its data communication terminal (data bus), and the high-speed data processing unit 2 calculates the error under the corresponding test conditions according to the formula And upload to the main control unit 1, the main control unit 1 controls the touch screen 5 to display corresponding information, and can upload to the host computer monitoring platform. The main control unit 1 automatically generates a test report after the test is completed according to the set test scheme.

When the smart substation is tested under the actual load on site, the main control unit 1 configures the communication parameters of the speed data processing unit 2 and the smart substation merging unit through the touch screen 5, such as MAC address, communication protocol, APPID, channel corresponding voltage and Current, etc., connect the meter pulse input interface (active power and reactive power pulse input port) of FPGA unit 4 to the pulse output port of the digital power meter to be checked; if the merging unit of the smart substation has a special verification output port, directly The ST optical fiber interface 31 or SC optical fiber interface 32 of the access device is checked. If the merging unit of the smart substation does not have a special output port, the multi-port synchronous forwarding function of the network management unit 3 is used to send the merging unit of the smart substation. The incoming messages are simultaneously sent to the electric energy meter to be checked and the high-speed data processing unit 2, that is to say, the on-site test can be conveniently realized without additional laying of cables. The high-speed data processing unit 2 and the watt-hour meter under test simultaneously obtain the digital signal of the merging unit of the smart substation, and at the same time under the same real-time dynamic load, the FPGA unit 4 dynamically collects the pulse output by the watt-hour meter under test, and at the rising edge of the first pulse Capture and send an interrupt to the high-speed data processing unit 2, and trigger an interrupt to the high-speed data processing unit 2 on another rising edge when the specified number of pulses arrives, and the high-speed data processing unit 2 calculates the period of time based on the difference between these two time points The accumulated electric quantity is calculated by conversion of the pulse constant to obtain the on-site error of the test point.

Simultaneously in order to test the conformity of the model of the station control layer protocol of IEC61850-8-1 uploaded by the digital electric energy meter, connect the RJ45 interface of the electric energy meter to be checked by the network interface module 15 of the main control unit, read the electric energy meter by the MMS protocol IEC61850 model to detect the function of the digital energy meter.

In summary, the smart substation digital electric energy meter verification device of the present invention adopts a multi-core architecture of data information processing of the main control unit, high-speed data processing unit and FPGA unit, and is used for real-time detection and verification to ensure that the device is accurate to the digital electric energy meter. The detection is real-time and efficient, and the detection accuracy is high; the main control unit can communicate with the background host computer conveniently by setting the network port; the USB interface and RS232 communication interface are set, which is convenient for connecting peripherals; the network management unit 3 is equipped with ST optical fiber interface 31 , SC optical fiber interface 32 and RJ45 interface 33, which facilitates the access to different optical fiber interfaces and network interfaces at the calibration site, without having to go to the calibration site to perform interface conversion, saving time and effort; at the same time, it solves the problem of on-site In the case of load verification, the optical fiber digital signal cannot be connected at the same time, and the dynamic accuracy measurement under the real load can be realized locally on the tested meter; through the setting of the touch screen and key unit, the control interface is friendly and easy to use; the structure is relatively Simple and low cost.

The above embodiments are descriptions of specific implementations of the present invention, rather than limitations of the present invention. Those skilled in the relevant technical fields can also make various transformations and changes without departing from the spirit and scope of the present invention. Corresponding equivalent technical solutions, therefore all equivalent technical solutions should fall into the patent protection scope of the present invention.

Claims (5)

1. A smart substation digital electric energy meter calibration device, characterized in that it includes a main control unit (1), a high-speed data processing unit (2), a network management unit (3), an FPGA unit (4), a touch screen ( 5), key unit (6) and power management unit (7); The main control unit (1) is provided with a first communication terminal, a second communication terminal, a display signal terminal and a key signal input terminal; the high-speed data processing unit (2) is provided with first to fifth communication terminals; the network management unit (3) A data signal communication terminal and a control signal communication terminal are provided; the FPGA unit (4) is provided with a data communication terminal; the touch display screen (5) is provided with a display signal terminal; the key unit (6) is provided with a signal output terminal; The first communication end of the main control unit (1) is electrically connected to the first communication end of the high-speed data processing unit (2) with bidirectional signals; the second communication end of the main control unit (1) is connected to the second communication end of the high-speed data processing unit (2). The two communication terminals are electrically connected with two-way signals; the display signal end of the main control unit (1) is electrically connected with the display signal end of the touch screen (5); the key signal input end of the main control unit (1) is connected with the key unit (6) ) is electrically connected to the signal output terminal of the high-speed data processing unit (2); the third communication terminal of the high-speed data processing unit (2) is electrically connected to the data signal communication terminal of the network management unit (3) for bidirectional signal electrical connection; the fourth communication terminal of the high-speed data processing unit (2) Bidirectional signal electrical connection with the control signal communication end of the network management unit (3); bidirectional signal electrical connection between the fifth communication end of the high-speed data processing unit (2) and the data communication end of the FPGA unit (4); power management unit (7) Used to provide working power. 2. The verification device for digital energy meters in smart substations according to claim 1, characterized in that: the main control unit (1) includes a CPU module (11), a flash memory module (12), an SDRAM module (13), Clock module (14), network interface module (15), communication interface module (16), USB interface module (17), display module (18) and dual-port RAM module (19); the CPU module (11) has a communication terminal and button signal input terminals; the display module (18) and the dual-port RAM module (19) are respectively provided with a first communication terminal and a second communication terminal; The flash memory module (12), SDRAM module (13), clock module (14), network interface module (15), communication interface module (16) and USB interface module (17) of the main control unit (1) are respectively connected with the CPU module (11) Two-way signal electrical connection; the first communication end of the display module (18) and the first communication end of the dual-port RAM module (19) are respectively electrically connected to the CPU module (11) two-way signal; The communication end of the CPU module (11) is the first communication end of the main control unit (1); the second communication end of the dual-port RAM module (19) is the second communication end of the main control unit (1); the CPU module The button signal input terminal of (11) is the key signal input terminal of the main control unit (1); the second communication terminal of the display module (18) is the display signal terminal of the main control unit (1). 3. The verification device for digital energy meters in smart substations according to claim 2, characterized in that: the high-speed data processing unit (2) includes a 32-bit DSP chip of model ADSP-BF518 with a main frequency of 400MHz. 4. The smart substation digital electric energy meter verification device according to claim 3, characterized in that: the network management unit (3) is provided with ST optical fiber interface (31), SC optical fiber interface (32) and RJ45 interface ( 33); wherein, there are two ST optical fiber interfaces (31) and SC optical fiber interfaces (32) respectively; three RJ45 interfaces (33) are provided. 5. The verification device for digital electric energy meters in smart substations according to claim 4, characterized in that: the FPGA unit (4) is provided with a high-frequency pulse output interface (41), an electric meter pulse input interface (42) and FT3 Data interface (43).

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