CN103986231A - Networked intelligent transformer substation metering system - Google Patents
Networked intelligent transformer substation metering system Download PDFInfo
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- CN103986231A CN103986231A CN201410205749.XA CN201410205749A CN103986231A CN 103986231 A CN103986231 A CN 103986231A CN 201410205749 A CN201410205749 A CN 201410205749A CN 103986231 A CN103986231 A CN 103986231A
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Abstract
The invention discloses a networked intelligent transformer substation metering system which comprises a concentration analysis unit, a CAN bus communication network and multiple intelligent metering terminals, wherein the concentration analysis unit is connected with the multiple intelligent metering terminals through the CAN bus communication network. According to the networked intelligent transformer substation metering system, the metering terminals can be installed on multiple outlet lines, information interaction of the multiple metering terminals is achieved based on the CAN bus communication network, the reliability is high, the redundancy rate is small, tele-transmission of collected electric energy information is achieved by the concentration analysis unit through special interfaces and tele-control channels, a real-time analysis method is provided, and a new method and a new system tool are provided for informatization and intelligent analysis of transformer substation metering and power distribution substation metering.
Description
Technical field
The invention belongs to transformer station's field of measuring techniques, particularly relate to a kind of networking intelligent substation metering system.
Background technology
Electric energy meter is device the most key in electric energy metered system, from 1880 in the world first utilize direct current energy meter that electrolysis principle makes till now, the history that the development of electric energy meter has been passed by more than 100 year, electric energy meter has been brought into play huge effect.
The producer that produces in the world at present electronic electric energy meter mainly contains: Lan Disi company of Switzerland, French Schlumberger company, ABB AB, GE company, SIEMENS company etc.China develops electronic electric energy meter since the beginning of the nineties in last century, the released one after another three phases electronic energy meter technology and much other company and enterprise have developed the single-phase and three phases electronic energy meter of polytype, specification in succession such as Wei Sheng group, section's land electronics, Huali Group, Heng Tong company.Through introducing, digest, absorbing, the electronic electric energy meter R&D and production of China starts to enter the Rapid development stage tallying with the national condition.
At present, along with the starting of China's power market reform and deeply, state of China net, the overwhelming majority of economizing in net Source of Gateway Meter at different levels have been updated to electronic electric energy meter, most of is import table meter, but low-voltage customer and ordinarily resident user's electronic electric energy meter are also not universal, and part province power supply department is being promoted the use of electronic electric energy meter in low pressure and ordinarily resident user with very fast speed.
Digital electric energy meter has become domestic and international electric power meter research and the main flow of applying at present, business-like electric energy metrical special integrated chip emerges in an endless stream, as the MCP3905/MCP3906 of Microchip Technology (Microchip Technology), the ADE7760/ADE7761 of ADI (Analog Device), this series products also has MXT7755, ATT7022B, FS6611, TM7755 etc.Above-mentioned electric energy metrical special integrated chip all has successful Application in electric power system.But the measurement point of electric energy metrical concentrates on the client of power consumer mostly at present, taking electricity charge charging as main purpose, or the total electric energy of whole power distribution station is measured, and does not generally install electric power meter at each leading-out terminal of power distribution station.Long-distance meter-reading system based on wired or wireless GSM/GPRS/CDMA network also has more successful Application in electric power system, as the wireless kilowatt meter reading-out system of Hangzhou Lierda Technology Co., Ltd..These digital electric energy meters and networking kilowatt meter reading-out system have that accurate measurement, integrated level are high, operating efficiency advantages of higher.
But existing electric energy metered system function mostly only has the simple function of electric energy metrical, do not possess the functions such as data storage, power quality analysis, failure wave-recording.And do not install electric power meter at each leading-out terminal of power distribution station, and cannot monitor, record the electric energy situation of each road leading-out terminal, also cannot monitor each circuit line loss and circuit and steal electric behavior.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of networking intelligent substation metering system.
In order to achieve the above object, networking intelligent substation metering system provided by the invention comprises: centralized Analysis unit, CAN bus communication network and three parts of Duo Tai intelligent metering terminal; Wherein: centralized Analysis unit is connected with many intelligent metering terminals by CAN bus communication network.
Described network-enabled intelligent metering system also comprises: Electric Energy Acquisition System, it is final data analysis display platform, comprise electric weight demonstration, power quality analysis, the inquiry of historical data and termination management module, be connected with centralized Analysis unit by Ethernet.
Described network-enabled intelligent metering system also comprises: multiple power modules, it is connected with many intelligent metering terminals respectively, is used to the power supply of intelligent metering terminal.
Described centralized Analysis unit is connected with many power station automation equipment by RS485 universal serial bus.
Described CAN bus network is serial communication network, and it is made up of communicate by letter twisted-pair feeder and core power line, and it is laid in cable testing bridge, and intelligent metering terminal is connected with bus mode with centralized Analysis unit.
Described centralized Analysis unit is that information about power is concentrated harvester, and it comprises: embedded main control module, LCD display module, CAN bus interface, network interface and RS485 interface; Wherein: embedded main control module is connected with LCD display module, CAN bus interface, network interface and RS485 interface respectively; CAN bus interface is connected with many intelligent metering terminals by CAN bus communication network; Network interface is connected with coulomb collection system; RS485 interface is connected with many power station automation equipment.
Described intelligent metering terminal comprises: master controller, clock and memory circuit, electrical source exchange and house dog, AD converter, signal conditioning circuit, CAN transceiver, power-supply system, backup battery and local debugging interface; Wherein: master controller is connected with house dog, AD converter, CAN transceiver and local debugging interface with clock and memory circuit, electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit with house dog, backup battery is connected with clock and memory circuit, AD converter is connected with PT with signal detection device CT by signal conditioning circuit, CAN transceiver is connected with CAN bus communication network, and power-supply system is connected with house dog, AD converter and signal conditioning circuit with master controller, electrical source exchange respectively.
Networking intelligent substation metering system provided by the invention can be installed measuring terminal in multichannel outlet, realize the information interaction of multiple metering terminal based on CAN bus communication network, reliability is high and redundancy is little, the energy information utilization centralized management unit gathering is realized teletransmission by special purpose interface and telecontrol channel and real-time analysis means is provided, for informationization and the intelligent analysis of transformer and distribution power station metering provide a kind of new means and system tool.
Brief description of the drawings
Fig. 1 is the structural representation of networking intelligent substation metering system provided by the invention.
Fig. 2 is networking intelligent substation metering system functional schematic.
Fig. 3 is the composition frame chart of centralized Analysis unit.
Fig. 4 is distributed intelligence measuring terminal logic diagram.
Fig. 5 is FM33256 memory circuit figure.
Fig. 6 is RC low-pass filter circuit figure.
Fig. 7 is AD73360L functional block diagram.
Fig. 8 is AD conditioning and sample circuit schematic diagram.
Fig. 9 is AD73360L and dsp interface circuit diagram.
Figure 10 is AD73360L synchronous serial interface communication succession figure.
Figure 11 is CAN bus circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, networking intelligent substation metering system provided by the invention is elaborated.
As shown in Figure 1-Figure 3, networking intelligent substation metering system provided by the invention comprises: centralized Analysis unit 1, CAN bus communication network 2 and 3 three parts of Duo Tai intelligent metering terminal; Wherein: centralized Analysis unit 1 is connected with many intelligent metering terminals 3 by CAN bus communication network 2.
Described networking intelligent substation metering system also comprises: Electric Energy Acquisition System 5, it is final data analysis display platform, comprise electric weight demonstration, power quality analysis, the inquiry of historical data and termination management module, be connected with centralized Analysis unit 1 by Ethernet 4.
Described networking intelligent substation metering system also comprises: multiple power modules 6, it is connected with many intelligent metering terminals 3 respectively, is used to intelligent metering terminal 3 to power.
Described centralized Analysis unit 1 is connected with many power station automation equipment by RS485 universal serial bus.
Centralized Analysis unit 1 is arranged in the screen cabinet of control room, for showing, store the parameter that measures the outlet of Ge road, carry out data analysis and provide result of calculation, transmitting desired data by network interface (carrier wave or optical cable) to upper level control centre.A centralized Analysis unit 1 of installing, each transformer and distribution power station control room can access 64 intelligent metering terminals 3 simultaneously.
CAN bus network 2 is serial communication network, it is made up of communicate by letter twisted-pair feeder and 3 core power lines, in its cable testing bridge that is laid in (ditch), intelligent metering terminal 3 is connected with bus mode with centralized Analysis unit 1, for centralized Analysis unit 1 and intelligent metering terminal 3 transfer of data between any two; Martingale by CAN bus is simple and direct, greatly facilitates the on-the-spot installation and debugging of system;
Intelligent metering terminal 3 is high accuracy electric weight metering device, and for gathering threephase potential transformer and Current Transformer Secondary side signal, it is arranged in outgoing switch cubicle, can gather voltage, current data, realize measuring parameter calculating, store and upload;
As shown in Figure 2, this system adopts threephase potential transformer, the threephase current transformer of metering high accuracy to whole system functional schematic, to ensure to measure the precision of calculating.In the outgoing switch cubicle of every road, have current transformer, voltage transformer signal need cause each outgoing switch cubicle from each section of bus PT cabinet.Voltage transformer, Current Transformer Secondary side signal are carried out to preliminary treatment, obtain being suitable for the voltage signal of A/D sampling, deliver to A/D sampling channel, the digital signal that sampling is obtained is carried out computing, obtain the parameters such as active energy, reactive energy, power factor, electric voltage frequency, and can expand functions such as realizing harmonic measure, power quality analysis, failure wave-recording, relevant parameter is uploaded to centralized Analysis unit by CAN bus.After the data that centralized Analysis unit 1 is uploaded in each intelligent metering terminal 3 of acquisition, can be connected with the existing Electric Energy Acquisition System of Shanghai Power Company and automation equipment interface.
As shown in Figure 3, harvester is concentrated for information about power in centralized Analysis unit 1, and it comprises: embedded main control module 11, LCD display module 12, CAN bus interface 13, network interface 14 and RS485 interface 15; Wherein: embedded main control module 11 is connected with LCD display module 12, CAN bus interface 13, network interface 14 and RS485 interface 15 respectively; CAN bus interface 13 is connected with many intelligent metering terminals 3 by CAN bus communication network 2; Network interface 14 is connected with coulomb collection system 5; RS485 interface 15 is connected with many power station automation equipment.
As shown in Figure 4, described intelligent metering terminal 3 comprises: master controller 31, clock and memory circuit 32, electrical source exchange and house dog 33, AD converter 34, signal conditioning circuit 35, CAN transceiver 36, power-supply system 37, backup battery 38 and local debugging interface 39; Wherein: master controller 31 is connected with house dog 33, AD converter 34, CAN transceiver 36 and local debugging interface 39 with clock and memory circuit 32, electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit 32 with house dog 33, backup battery 38 is connected with clock and memory circuit 32, AD converter 34 is by signal conditioning circuit 35 and signal detection device CT, PT is connected, CAN transceiver 36 is connected with CAN bus communication network 2, and power-supply system 37 is connected with house dog 33, AD converter 34 and signal conditioning circuit 35 with master controller 31, electrical source exchange respectively.
Because measuring terminal is designed with the electric energy quality monitoring such as harmonic wave, tri-phase unbalance factor function, adopt the hardware plan of High Performance DSP and table meter sigma-delta AD so do not adopt table meter chip, this system can be obtained the Direct Sampling point of electric current and voltage, be convenient to calculate harmonic wave, tri-phase unbalance factor, and Measurement accuracy mains frequency.The overall hardware configuration of terminal installation comprises DSP minimum system, power-supply system, PT/CT and signal conditioning circuit, backup battery, electrical source exchange and house dog, real-time clock and data storage (RTC and FRAM), local debug serial port, CAN bus interface etc.; Fig. 2 is distributed measuring terminal logic diagram, as shown in Figure 2: first voltage transformer/Current Transformer Secondary side signal isolates again through high precision small instrument transformer, and is converted to weak electric signal, and then through entering AD transducer after low-pass filtering.AD adopts the special six passage 16bit AD converter of electric energy metrical, sample frequency 8K SPS, built-in frequency overlapped-resistable filter and programmable amplifier (PGA).
CAN bus interface is realized jointly by CAN controller on DSP sheet and CAN bus transceiver, supports CAN2.0B agreement, and transmission rate reaches as high as 1Mbps.
Physical end device divides three modules: power supply and instrument transformer module (PIO), core main control module (CORE), panel indicating module.
Power transformer module PIO has two functions: power conversion, measuring-signal conversion.Outside direct current or AC power are transformed to 5V DC power supply by power conversion, and measuring-signal translation circuit is small-sized measuring voltage instrument transformer, the current transformer of high accuracy high linearity, outside forceful electric power signal is converted to mA level weak electric signal, and the system of being convenient to is further processed measurement.
Core main control module CORE comprises that all major functions of system such as DSP minimum system, linear voltage decreasing voltage stabilizing, signal condition, AD conversion, CAN transceiver, clock and data storage (RTC and FRAM) realize circuit.
Panel indicating module is mainly used in indication mechanism power supply status, system running state, data communication state, active energy pulse, reactive energy pulse, and the ports such as program is downloaded, debugging, communication verification are provided simultaneously.
Power-supply system 37 is electric current, voltage conversion circuit and interface protective circuit, and power conversion adopts wide region Switching Power Supply, the compatible 85～265V AC of input and 100～300V DC, output voltage 5V, maximum output current 2A.Power conversion input circuit safety electric capacity in parallel (X electric capacity and Y electric capacity), series connection common mode inductance are to reduce common mode High-frequency Interference;
Signal conditioning circuit 35 is electric current, voltage conversion circuit, adopt the small-size voltage transformer summation current transformer of the special high linearity of metering, instrument transformer is converted to weak electric signal by forceful electric power signal on the one hand, reaches on the other hand the inner object of isolating with external system of device.
Master controller 31 is the control core of intelligent metering terminal 3, the minimum system being made up of DSP and data storage is calculating and the control core of whole terminal, terminal adopts the high-performance 32 processor TMS320F2812 of TI company, and configure 256K × 16bit SRAM, 4M × 16bit FLASH construction system core together.SRAM is temporary for program operation process data, and FLASH has non-volatile feature, be applicable to save historical data and statistics, and system parameters is stored in the ferroelectric RAM (FRAM) of a slice SPI interface.For improving level of integrated system, FRAM selects the multi-functional FRAM chip FM33256 with real-time clock (RTC), Fig. 5 is the circuit theory diagrams of FM33256, as shown in Figure 5, real-time clock is with backup battery and dynamic power supplies commutation circuit, in the time of system power failure, can be switched to immediately powered battery.
The system core also comprises that an operation monitoring circuit TPS3606 (house dog) is to improve the reliability of whole system, and operation monitoring circuit can effectively prevent program exception and the deadlock during dsp operation.
Signal conditioning circuit 35 is input signal conditioning circuit, first the mA level weak current signal being obtained by electric current, voltage conversion circuit is converted to voltage signal with accurate sample resistance, then further reduce High-frequency Interference through RC low-pass filtering and promote signal to noise ratio, finally by input AD converter after reference voltage biasing.Six groups of weak current signals that three-phase current and three-phase voltage conversion produce adopt identical pre-process circuit, and principle as shown in Figure 6.
Sample circuit is selected six special passage 16-bit sigma-delta AD converter AD73360L of ADI company three phase metering, sample frequency 8kSPS.Each input channel of this chip all has oneself independently signal condition, programmable amplifier (PGA) and sigma-delta AD conversion, is suitable as very much professional electric energy metrical and gathers front end, and its inside function block diagram as shown in Figure 7.
It is difference or single-ended input pattern that signal condition allows input configuration, and all signals on sheet more than integrated frequency overlapped-resistable filter (Anti-alias) filtering 4kHz have been avoided frequency alias problem completely for the 8kHz sampling of system.The function of the software configuration multiplication factor that on sheet, PGA supports has greatly been simplified external signal modulate circuit.
Metering system needs the ADC of high-resolution, high integration high s/n ratio and low price, novel sigma-delta switch technology can meet these requirements just, simulation part in sigma-delta-converter is simple (being similar to a 1bit ADC) very, and numerical portion is more complex, can be divided into digital filtering and extracting unit according to function, so closer to a digital device.The operation principle of sigma-delta-converter is based on oversampling technique, if to sampling with frequency f s after input signal, according to Nyquist theorem, sample frequency at least doubles input signal, can see from fft analysis result, quantizing noise is to be distributed in DC to the random noise between fs/2, is mainly because limited ADC resolution causes.In order to improve SNR and playback input signal more accurately, a kind of mode is the figure place that increases ADC, and the another kind of mode oversampling technique that to be sigma-delta-converter adopt.If sample frequency is improved to an over-sampling coefficient k, sample frequency is kfs, and fft analysis display noise baseline has reduced, and SNR value does not become, but noise energy is distributed to a wider frequency range.Sigma-delta-converter has utilized this principle just, and concrete grammar is and then after 1bit ADC, to carry out digital filtering.Most of noise is filtered by digital filter, and like this, RMS noise has just reduced, thereby by a low resolution A/D C, sigma-delta-converter has obtained wide dynamic range.Extracting unit (decimator) after digital filtering, its extraction yield is determined by over-sampling rate and ADC output sample speed.Extracting unit is also kept in the 1bit AD Output rusults internal RAM that the sample value that obtains is stored in AD73360L that add up by AD output figure place; Fig. 8 is three-phase current, voltage signal conditioning and sample circuit principle.
AD73360L and dsp interface are synchronous serial interface, and Fig. 9 has represented interface circuit schematic diagram; On F2812 sheet, McBSP interface configuration is very flexible, can with seamless coupling of synchronous serial interface sequential of AD73360L, its sequential chart is as shown in 10; Voltage-reference adopts REF3212, and for AD provides the conversion reference voltage of 1.25V, AD needs outside input clock sources (frequency 16.384MHz) simultaneously.
Described CAN transceiver 36 is CAN bus communication protocol data link layer protocol, mainly completed by CAN controller, the inner integrated CAN controller of supporting CAN2.0B agreement of TMS320F2812, physical layer realizes by SN65HVD230D transceiver, and transmission rate reaches as high as 1Mbps.The electrical isolation that realizes built-in system and external bus with outside by AD μ M1201 magnetic isolating chip, circuit as shown in figure 11.
Intelligent metering terminal 3 also comprises LED light, serial communication port, local debugging interface 39; The indication mechanism power supplys such as LED light, operation, communications status and active energy pulse output, reactive energy pulse output etc.Serial communication port is for the inline diagnosis of device, and local debugging interface 39 is JTAG debugging interface, is the main debugging interface of development.
The present invention gathers the electric current and voltage information in each outlet by intelligent metering terminal, then analyzes by backstage, draws the situation of harmonic wave in the situation of exporting energy in whole transformer station, each outlet etc.By intelligent metering terminal is installed in multichannel outlet, realize the information interaction of multi-way intelligence measuring terminal based on CAN bus communication network, reliability is high and redundancy is little, the energy information gathering utilizes centralized Analysis unit realize teletransmission by special purpose interface and telecontrol channel and real-time analysis means are provided, for informationization and the intelligent analysis of transformer station's metering provide a kind of new means and system tool.
Claims (7)
1. a networking intelligent substation metering system, is characterized in that: described networking intelligent substation metering system comprises: centralized Analysis unit (1), CAN bus communication network (2) and (3) three parts of many intelligent metering terminals; Wherein: centralized Analysis unit (1) is connected with many intelligent metering terminals (3) by CAN bus communication network (2).
2. networking intelligent substation metering system according to claim 1, it is characterized in that: described network-enabled intelligent metering system also comprises: Electric Energy Acquisition System (5), it is final data analysis display platform, comprise electric weight demonstration, power quality analysis, the inquiry of historical data and termination management module, be connected with centralized Analysis unit (1) by Ethernet (4).
3. networking intelligent substation metering system according to claim 1, it is characterized in that: described network-enabled intelligent metering system also comprises: multiple power modules (6), it is connected with many intelligent metering terminals (3) respectively, is used to intelligent metering terminal (3) power supply.
4. networking intelligent substation metering system according to claim 1, is characterized in that: described centralized Analysis unit (1) is connected with many power station automation equipment by RS485 universal serial bus.
5. networking intelligent substation metering system according to claim 1, it is characterized in that: described CAN bus network (2) is serial communication network, it is made up of communicate by letter twisted-pair feeder and 3 core power lines, it is laid in cable testing bridge, and intelligent metering terminal (3) is connected with bus mode with centralized Analysis unit (1).
6. networking intelligent substation metering system according to claim 1, it is characterized in that: harvester is concentrated for information about power in described centralized Analysis unit (1), and it comprises: embedded main control module (11), LCD display module (12), CAN bus interface (13), network interface (14) and RS485 interface (15); Wherein: embedded main control module (11) is connected with LCD display module (12), CAN bus interface (13), network interface (14) and RS485 interface (15) respectively; CAN bus interface (13) is connected with many intelligent metering terminals (3) by CAN bus communication network (2); Network interface (14) is connected with coulomb collection system (5); RS485 interface (15) is connected with many power station automation equipment.
7. networking intelligent substation metering system according to claim 1, is characterized in that: described intelligent metering terminal (3) comprising: master controller (31), clock and memory circuit (32), electrical source exchange and house dog (33), AD converter (34), signal conditioning circuit (35), CAN transceiver (36), power-supply system (37), backup battery (38) and local debugging interface (39); Wherein: master controller (31) is connected with house dog (33), AD converter (34), CAN transceiver (36) and local debugging interface (39) with clock and memory circuit (32), electrical source exchange respectively; Electrical source exchange is connected with clock and memory circuit (32) with house dog (33), backup battery (38) is connected with clock and memory circuit (32), AD converter (34) is by signal conditioning circuit (35) and signal detection device CT, PT is connected, CAN transceiver (36) is connected with CAN bus communication network (2), and power-supply system (37) is connected with house dog (33), AD converter (34) and signal conditioning circuit (35) with master controller (31), electrical source exchange respectively.
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| CN106597090A (en) * | 2017-01-23 | 2017-04-26 | 江苏中乂电气有限公司 | Electric energy data collection system based on wireless network transmission and working method thereof |
| CN111586729A (en) * | 2020-04-30 | 2020-08-25 | 贵州电网有限责任公司 | Three-network signal detection method and system based on metering terminal communication |
| CN112310839A (en) * | 2020-10-20 | 2021-02-02 | 华翔翔能科技股份有限公司 | Switch cabinet capable of displaying electric energy information |
| CN112448736A (en) * | 2019-09-05 | 2021-03-05 | 南京南大天域智能科技有限公司 | Ubiquitous electric power thing networking electric energy meter |
| RU2798189C1 (en) * | 2022-06-20 | 2023-06-16 | федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный технический университет" | Method for determining proportion of interference energy generated by an electrical consumer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106597090A (en) * | 2017-01-23 | 2017-04-26 | 江苏中乂电气有限公司 | Electric energy data collection system based on wireless network transmission and working method thereof |
| CN112448736A (en) * | 2019-09-05 | 2021-03-05 | 南京南大天域智能科技有限公司 | Ubiquitous electric power thing networking electric energy meter |
| CN111586729A (en) * | 2020-04-30 | 2020-08-25 | 贵州电网有限责任公司 | Three-network signal detection method and system based on metering terminal communication |
| CN111586729B (en) * | 2020-04-30 | 2023-06-27 | 贵州电网有限责任公司 | Three-network signal detection method and system based on metering terminal communication |
| CN112310839A (en) * | 2020-10-20 | 2021-02-02 | 华翔翔能科技股份有限公司 | Switch cabinet capable of displaying electric energy information |
| RU2798189C1 (en) * | 2022-06-20 | 2023-06-16 | федеральное государственное бюджетное образовательное учреждение высшего образования "Ульяновский государственный технический университет" | Method for determining proportion of interference energy generated by an electrical consumer |
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Application publication date: 20140813 |