CN201796138U - Terminal calibration system based on electric energy measuring chip - Google Patents
Terminal calibration system based on electric energy measuring chip Download PDFInfo
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- CN201796138U CN201796138U CN2010202279473U CN201020227947U CN201796138U CN 201796138 U CN201796138 U CN 201796138U CN 2010202279473 U CN2010202279473 U CN 2010202279473U CN 201020227947 U CN201020227947 U CN 201020227947U CN 201796138 U CN201796138 U CN 201796138U
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Abstract
The utility model discloses a terminal calibration system based on an electric energy measuring chip, which is characterized by comprising an upper computer, a three-phase program-controlled source, a standard meter and a plurality of calibrated terminals. The upper computer controls the three-phase program-controlled source through a serial port; the three-phase program-controlled source provides the required calibration conditions for the calibrated terminals and measurement values of an electric energy measuring chip when each of the calibrated terminals acquires the corresponding conditions; the standard meter is used for measuring actual values of the calibration conditions outputted by the three-phase program-controlled source; the upper computer sends the actual values measured by the standard meter to each of the calibrated terminals; under the calibration conditions, the calibrated terminals calculate errors to obtain calibration parameters according to the measurement values of the electric energy measuring chip and the actual values. The terminal calibration system based on an electric energy measuring chip is simple and easy to control, short in time consumption and high in calibration accuracy.
Description
Technical field
The utility model relates to a kind of terminal calibration system based on electric energy computation chip, can be applied in the calibration in enormous quantities of various terminals of distribution network system or electric energy meter.
Background technology
The electric power supervisory control terminal have to electrical network carry out real-time data acquisition, distant place remote signalling remote control, fault handling, warning and to the time etc. function, be the powerful guarantee that electrical network can normally move safely.Along with country to building the proposition of strong intelligent grid theory, measuring accuracy to the electric power supervisory control terminal requires also more and more higher, the method of measuring the electrical network electric parameter by ADC in the sheet of microprocessor is difficult to reach high-precision requirement, if adopt high-precision ADC chip cost higher again, and electric energy computation chip has been taken into account the requirement of terminal to precision and cost well.When adopting the module that electric energy computation chip measures the electrical network electric parameter in real time as the electric power supervisory control terminal, its measuring accuracy also depends on the calibration to the terminal inner electric energy computation chip except outside the Pass having with terminal self Hardware Design.At present, the conventional method that electric energy computation chip is calibrated is to export with the correction platform full sized pules by the output of comparison electric energy computation chip internal pulses to realize calibration, i.e. " with the source calibration "; This method is to calculate calibration parameter according to the pulse error of individual phase measurement, and pulse output becomes very slow when little electric current, this will elapsed time, and the error size of each station terminal differs, to carry out computing respectively, and three-phase can not be calibrated simultaneously, and this method greatly reduces the efficient of calibration.
The utility model content
The utility model is for avoiding above-mentioned existing in prior technology weak point, a kind of weak point simple and easy to control, consuming time is provided, and the high terminal calibration system based on electric energy computation chip of calibration accuracy.
The utility model technical solution problem adopts following technical scheme:
The design feature of the terminal calibration system based on electric energy computation chip of the present utility model is: the system that is provided with constitutes and comprises that host computer, the program control source of three-phase, standard scale and Duo Tai are by the school terminal; Described host computer is controlled the program control source of three-phase with the host computer calibration procedure of setting by serial ports, for being provided required calibration condition by the school terminal, obtains the measured value of the electric energy computation chip under the corresponding calibration condition by the program control source of three-phase respectively in described each terminal; Described standard scale is used for measuring the actual value of the calibration condition of exporting in the program control source of described three-phase that is embodied as voltage, electric current, active power, reactive power and power factor; Described host computer sends to each by the school terminal with the actual value of the measured calibration condition of standard scale simultaneously by the RS485 bus; Under calibration condition, describedly obtained calibration parameter by the terminal calibration procedure set according to the measured value and the calculated with actual values deviation of electric energy computation chip by the school terminal, calibration parameter is written in the calibration register of electric energy computation chip, and is saved in realization calibration in the terminal inner nonvolatile memory.
The design feature of the utility model system also is:
When calibration active power, reactive power and phase place, described electric energy computation chip is set to be operated under the linear period accumulation mode, enable and be provided with periodicity by configuration register, rising edge zero passage with the electric energy computation chip detection signal writes down periodicity, when the rising edge zero passage of record reaches the periodicity of setting, promptly produce linear period interrupt control signal, inform that described terminal inner primary processor is sampled and finish that this moment is with the numerical value of the electric energy computation chip energy register that the reads measured value as described chip in the time of set periodicity.
Under given calibration condition, described terminal calibration procedure carries out according to the following steps according to the host computer calibration command that receives: at first calibration voltage, electric current and active power; Calibrate reactive power then; Then carry out phase alignment, divide gear for different size of current and respectively it is carried out phase alignment, obtain the pairing phase alignment parameter of different size of current gears; Preserve all calibration parameters at last.
In described phase alignment, by the calibration condition of host computer setting be: voltage U=220V, power factor cos Φ=0.5, the current value of different gears.By the different electric current gears of PC control from little to just automaticallying switch successively, terminal is finished the phase alignment of different electric current gears under the linear period accumulation mode.
Compared with the prior art, the utility model beneficial effect is embodied in:
The utility model method is based on the real-time relative method of high precision standard scale, the output of the program control source signal of PC control three-phase, and the actual value of each electric parameter of standard scale by the RS485 bus transfer to every by on the terminal of school, each station terminal calibration procedure will calculate the calibration parameter of oneself automatically.The utility model method flow is controlled easily, real-time height, weak point consuming time, can connect 48 on the RS485 bus at most by the school terminal, so just can the many station terminals of disposable calibration, and three-phase can calibrate simultaneously, and it is very high so just to have improved calibration efficiency and calibration accuracy greatly.
Description of drawings
Fig. 1 is the utility model terminal calibration system theory diagram;
Fig. 2 is the utility model terminal hardware theory diagram;
Fig. 3 is the utility model host computer calibration procedure process flow diagram;
Fig. 4 is the utility model terminal calibration process flow diagram;
Fig. 5 is the utility model terminal calibration main program flow chart;
Fig. 6 is the utility model terminal voltage current gain calibration process flow diagram;
Fig. 7 is the utility model tag wire accumulation mode in sexual cycle program flow diagram;
Fig. 8 is the meritorious idle gain calibration process flow diagram of the utility model terminal;
Fig. 9 is the utility model terminal phase alignment process flow diagram;
Below pass through embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.
Embodiment
Referring to Fig. 1, terminal calibration system constitutes in the present embodiment: host computer converts a plurality of RS232 serial ports to by the USB RS 232, serial ports 1 is communicated by letter with standard scale respectively at the program control source of three-phase with serial ports 4, and serial ports 2 is linked to each other by the school terminal with 48 by the RS485 bus through the RS232/485 converter respectively with serial ports 3.
Fig. 2 is the utility model terminal hardware theory diagram.Comprise ADE7758 electric energy computation chip, MCU, power management and peripheral circuit, wherein peripheral circuit has digital quantity input and output circuit, RS485 communication interface, RS232 communication interface, EEPROM data storage circuitry, clock circuit, button and LCD display circuit.
The utility model system calibration program comprises host computer calibration procedure and terminal calibration procedure, and the terminal calibration procedure comprises terminal calibration master routine, terminal voltage current gain calibration procedure, tag wire accumulation mode in sexual cycle program, the meritorious idle gain calibration program of terminal and terminal phase alignment program.
Referring to Fig. 3, host computer calibration procedure flow process is: carry out initialization when host computer begins, the communications status of each serial ports is set, steering order is sent to the program control source of three-phase, to satisfy the calibration condition of this gear, treat that stable back, the program control source of three-phase sends calibration command, the actual value that standard scale is measured is included in the calibration command, terminal begins to carry out calibration procedure after receiving calibration command, calculate the error between the measured value that the actual value that recorded by standard scale and computation chip record and draw calibration parameter, again calibration parameter is write the corresponding registers of electric energy computation chip and be saved in the nonvolatile memory and back up, re-power or write in the calibration register again again by MCU when resetting.The host computer calibration adopts a key to calibrate automatically, according to the order self shifter that sets, can change next gear automatically into after the calibration of a certain gear is finished, and so circulation is finished up to whole calibration.
Referring to Fig. 4, terminal calibration flow process is: earlier host computer is given the calibration command frame that comes and communicate verification, voltage gain and current gain are influential to follow-up energy accumulation, necessary first calibration voltage and current gain, again meritorious gain, idle gain and phase place are calibrated respectively, preserve calibration parameter at last.
Fig. 5 is terminal calibration main program flow chart.The terminal master routine at first carries out the initialization setting, utilizes the serial ports interrupt service routine to receive and send data; Receive the calibration command frame of host computer transmission when the interruption program after, zone bit is set informs that master routine can carry out data processing; Master routine is separated frame and frame check to the data that receive, if verification is correct, the terminal calibration procedure is calibrated accordingly according to the calibration command sign indicating number of separating in the frame, preserves calibration parameter in nonvolatile memory after calibration is finished.
Fig. 6 is terminal voltage current gain calibration process flow diagram.The calibration condition of electric current and voltage gain is: voltage U=220V, electric current I=1.5A, power factor cos Φ=1.0.To the zero clearing of electric current and voltage gain register, enable interrupt mask register earlier; The double then reset interrupt status register of reading if just jump out circulation during interrupt flag bit set in this register, so just can just capture adjacent rising edge and cross null event, and just data sampling is finished the semiperiod; The measured value that can read voltage and current with that calculates gain coefficient; Coefficient with calibration writes corresponding registers and closes the interruption mask register at last.
Fig. 7 is tag wire accumulation mode in a sexual cycle program flow diagram.The Frequency Dividing Factor of active power and reactive power is set during beginning, and the guaranteed output register does not overflow; Selection wire accumulation mode in sexual cycle and write cycle number, open interrupt mask register; The double reset interrupt status register of reading if just jump out circulation during interrupt flag bit set in this register, so just can be read set complete cycle and count gaining merit and the quadergy accumulated value in the time; Close then and interrupt mask register and cancel the linear period accumulation mode; At last the energy accumulation value of reading is returned as functional value.
Fig. 8 is the meritorious idle gain calibration process flow diagram of terminal.The calibration condition of meritorious gain is: voltage U=220V, electric current I=1.5A, power factor cos Φ=1.0; The calibration condition of idle gain is: voltage U=220V, electric current I=1.5A, power factor cos Φ=0.At first the meritorious and idle gain register of zero clearing is provided with the periodicity under the linear period accumulation mode; Call linear period accumulation mode function again and obtain gaining merit and the quadergy accumulation amount in cycle length, relatively calculate calibration factor with actual value; Write at last in the corresponding register.
The terminal phase alignment adopts by different size of current and divides the method that gear carries out phase alignment respectively in the utility model, under the linear period accumulation mode, finish the phase alignment of different electric current gears, different gears are selected the corresponding linear periodicity when calibration, along with the increase linear period number of electric current reduces gradually.Host computer sends to the program control source of three-phase with the calibration condition of each gear, treat that the output of the program control source of three-phase is stable after, terminal begins the calibration of this gear, finishes the back Automatic Program and switches to next gear, carries out the phase alignment of next gear, finishes up to phase alignment.
Fig. 9 is a terminal phase alignment process flow diagram.The calibration condition of phase place is: voltage U=220V, power factor cos Φ=0.5, the electric current that electric current is provided with for each gear.At first zero clearing phase deviation register is provided with the periodicity under the linear period accumulation mode; Call linear period accumulation mode function again and obtain interior meritorious energy accumulation amount cycle length; Relatively calculate power deviation with actual value, just obtain required calibration parameter according to the positive and negative constant factor that multiply by respectively of deviation; At last these calibration parameters are write in the corresponding register.
Table 1 is the calibration condition tabulation.Calibration item is corresponding one by one with calibration condition, when calibration voltage, electric current and active power, because calibration condition is identical, calibrates so place it in same gear, and its command code is 0x81; Reactive power is aligned in power factor and equals to carry out in 0 o'clock, and other calibration condition is identical with the active power calibration, and its command code is 0x82; Phase alignment can suitably be divided gear according to size of current according to the characteristic of institute's Current Transformer, be that the current transformer characteristic of 5A/2.5mA is divided into 9 grades to it according to used no-load voltage ratio in the utility model, electric current is from 0.075A to 6A, corresponding command code is from 0x83 to 0x8B, and this moment, power factor was made as 0.5.
Table 1
Claims (1)
1. the terminal calibration system based on electric energy computation chip is characterized in that being provided with system's formation and comprises that host computer, the program control source of three-phase, standard scale and Duo Tai are by the school terminal;
Described host computer is controlled the program control source of three-phase with the host computer calibration procedure of setting by serial ports, for being provided required calibration condition by the school terminal, obtains the measured value of the electric energy computation chip under the corresponding calibration condition by the program control source of three-phase respectively in described each terminal;
Described standard scale is used for measuring the actual value of the calibration condition of exporting in the program control source of described three-phase that is embodied as voltage, electric current, active power, reactive power and power factor;
Described host computer sends to each by the school terminal with the actual value of the measured calibration condition of standard scale simultaneously by the RS485 bus; Under calibration condition, describedly obtained calibration parameter by the terminal calibration procedure set according to the measured value and the calculated with actual values deviation of electric energy computation chip by the school terminal, calibration parameter is written in the calibration register of electric energy computation chip, and is saved in realization calibration in the terminal inner nonvolatile memory.
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| CN2010202279473U CN201796138U (en) | 2010-06-09 | 2010-06-09 | Terminal calibration system based on electric energy measuring chip |
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| CN2010202279473U CN201796138U (en) | 2010-06-09 | 2010-06-09 | Terminal calibration system based on electric energy measuring chip |
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| CN201796138U true CN201796138U (en) | 2011-04-13 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876693A (en) * | 2010-06-09 | 2010-11-03 | 合肥工业大学 | Electric energy metering chip-based terminal calibration system |
| CN103389931A (en) * | 2012-05-07 | 2013-11-13 | 中国长城计算机深圳股份有限公司 | Power source automatic calibration device and calibration method thereof |
| CN103728553A (en) * | 2013-12-31 | 2014-04-16 | 万高(杭州)科技有限公司 | Method for verifying electric energy measuring chip |
| CN104597421A (en) * | 2013-10-31 | 2015-05-06 | 南通富士特电力自动化有限公司 | Reactive compensation automatic calibrating device |
| CN110196404A (en) * | 2019-05-24 | 2019-09-03 | 深圳智链物联科技有限公司 | A kind of metering chip calibration method, device and the terminal device of charging pile |
| CN113884726A (en) * | 2021-10-19 | 2022-01-04 | 飞思仪表（深圳）有限公司 | Three-phase smart electric meter with quick calibration structure |
| CN114252840A (en) * | 2021-12-16 | 2022-03-29 | 深圳市道通合创新能源有限公司 | Method and system for calibrating electric energy meter |
-
2010
- 2010-06-09 CN CN2010202279473U patent/CN201796138U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876693A (en) * | 2010-06-09 | 2010-11-03 | 合肥工业大学 | Electric energy metering chip-based terminal calibration system |
| CN101876693B (en) * | 2010-06-09 | 2013-06-12 | 合肥工业大学 | Electric energy metering chip-based terminal calibration system |
| CN103389931A (en) * | 2012-05-07 | 2013-11-13 | 中国长城计算机深圳股份有限公司 | Power source automatic calibration device and calibration method thereof |
| CN103389931B (en) * | 2012-05-07 | 2015-11-25 | 中国长城计算机深圳股份有限公司 | A kind of power supply self-checking device and calibration steps thereof |
| CN104597421A (en) * | 2013-10-31 | 2015-05-06 | 南通富士特电力自动化有限公司 | Reactive compensation automatic calibrating device |
| CN103728553A (en) * | 2013-12-31 | 2014-04-16 | 万高(杭州)科技有限公司 | Method for verifying electric energy measuring chip |
| CN103728553B (en) * | 2013-12-31 | 2017-02-22 | 杭州万高科技股份有限公司 | Method for verifying electric energy measuring chip |
| CN110196404A (en) * | 2019-05-24 | 2019-09-03 | 深圳智链物联科技有限公司 | A kind of metering chip calibration method, device and the terminal device of charging pile |
| CN110196404B (en) * | 2019-05-24 | 2022-04-19 | 深圳智链物联科技有限公司 | Charging pile metering chip calibration method and device and terminal equipment |
| CN113884726A (en) * | 2021-10-19 | 2022-01-04 | 飞思仪表（深圳）有限公司 | Three-phase smart electric meter with quick calibration structure |
| CN114252840A (en) * | 2021-12-16 | 2022-03-29 | 深圳市道通合创新能源有限公司 | Method and system for calibrating electric energy meter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20120609 |