CN109061289A - A kind of electrical energy measurement scheme of voltage, currents combination flexibly configurable - Google Patents
A kind of electrical energy measurement scheme of voltage, currents combination flexibly configurable Download PDFInfo
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- CN109061289A CN109061289A CN201810953506.2A CN201810953506A CN109061289A CN 109061289 A CN109061289 A CN 109061289A CN 201810953506 A CN201810953506 A CN 201810953506A CN 109061289 A CN109061289 A CN 109061289A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/08—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using analogue techniques
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Abstract
A kind of electrical energy measurement scheme of voltage, currents combination flexibly configurable, the system scheme that a kind of analog switch+software exchange control+error trims algorithm is provided, station institute's terminal line loss module is realized and configures electrical energy measurement value flexible configuration at the combination of different voltages electric current.The configuration sets switch by using hilted broadsword is double, and 8 road current sampling signal of MCU process control is combined all the way with any in 2 road voltage sampling signals, and combined quantity shares 9 kinds；The error that an electrical energy measurement is done under the combination of each voltage and current, which is trimmed and stored, trims coefficient, in practical application according to voltage and current channel combination control analog switch switching state and call and corresponding trim coefficient to carry out corresponding electrical energy measurement, it is ensured that the energy metering accuracy of each voltage and current combination is all satisfied index request.
Description
Technical field
The present invention relates to a kind of solution of special electrical energy measurement product, the products application is in having plurality of voltages and more
In the system in road current sample channel, electrical energy measurement value can be with flexible configuration at the combination of different voltages electric current.
Background technique
Electrical energy measurement is a very important technology in electric system, is commonly used to the measurement of line loss during power transmission and distribution
And the charge calculation with electrical domain, recently as the distribution one or two of distribution automation greatly developed and Guo Wang company proposes
The cry of the requirement of secondary fusion, distribution lean management increasingly improves.Line loss in the transmission & distribution net data important as one,
Dedicated equipment has been sought to complete to measure, has planned station institute terminal line loss module and feedback in one or two integration programs of Guo Wang company
Two product of line terminal line loss module.
Institute's terminal line loss module of standing is used in inside DTU equipment, has the input of two-way three-phase voltage signal and 8 road three-phase currents
Signal input, can measure the three-phase electric energy in most 8 channels, and the combination of voltage sample and current sample corresponding one is returned all the way
The electrical energy measurement on road, in practical applications, two-way voltage signal may carry out different combinations with 8 road current signals to realize
The electrical energy measurement of different circuit, product uses short dot generally to realize the combination switching of voltage and current sample, product at present
User needs the combination of clear voltage signal and current signal before dispatching from the factory, to phase after the corresponding corresponding short dot of short circuit in factory
Answer channel electrical energy measurement carry out error trim, product once dispatch from the factory voltage and current channel combination will be unable to change,
But with website institute terminal in actual moving process, the combination of voltage and current channel may change, and thus need
Product still can realize the electrical energy measurement of corresponding channel after capable of dispatching from the factory with the combination of flexible configuration voltage and electric current.
Summary of the invention
The present invention provides a kind of analog switch+software exchange control+error and repairs for deficiency existing for the above existing scheme
The system scheme for adjusting algorithm realizes station institute's terminal line loss module for electrical energy measurement value flexible configuration into different voltages electric current
Combination.The configuration can be realized by communication interface, meet the actual demand of user at the scene.
Purpose is appealed to realize, the present invention is adopted by using the double analog switches set of hilted broadsword, 8 road electric current of MCU process control
Sample signal is combined all the way with any in 2 road voltage sampling signals, and combined quantity shares 9 kinds, as follows respectively:
1st road voltage channel --- the road 1-8 current channel, the 2nd road voltage channel --- it is useless；
1st road voltage channel --- the road 1-7 current channel, the 2nd road voltage channel --- the 8th road current channel；
1st road voltage channel --- the road 1-6 current channel, the 2nd road voltage channel --- the road 7-8 current channel；
1st road voltage channel --- the road 1-5 current channel, the 2nd road voltage channel --- the road 6-8 current channel；
1st road voltage channel --- the road 1-4 current channel, the 2nd road voltage channel --- the road 5-8 current channel；
1st road voltage channel --- the road 1-3 current channel, the 2nd road voltage channel --- the road 4-8 current channel；
1st road voltage channel --- the road 1-2 current channel, the 2nd road voltage channel --- the road 3-8 current channel；
1st road voltage channel --- the 1st road current channel, the 2nd road voltage channel --- the road 2-8 current channel；
1st road voltage channel --- useless, the 2nd road voltage channel --- the road 1-8 current channel；
The error that an electrical energy measurement is done under the combination of each voltage and current, which is trimmed and stored, trims coefficient, actually answers
With the switching state of the middle combination control analog switch according to voltage and current channel and calls and corresponding trim coefficient and carry out phase
The electrical energy measurement answered, it is ensured that the energy metering accuracy of each voltage and current combination is all satisfied index request.
Detailed description of the invention
Fig. 1 is original schematic diagram that voltage and current combination is adjusted using short dot
Fig. 2 is circuit diagram of the invention
Specific embodiment
Circuit structure and parameter of the invention are described in detail below with reference to Fig. 2 and implementation sample.
1. hardware description
(1) sampled signal input description: as shown in Fig. 2 circuit diagram, voltage sampling signal has 2 tunnels, every road have A,
B, tetra- line three-phase of C, N accesses, and voltage accesses 0~264V of range AC, is connect by resistance pressure-dividing network 160K Ω and voltage transformer
Enter N line, the electric current by voltage transformer primary is 0~1.65mA of AC, and voltage transformer parameter is 0.05 grade of 2mA/2mA, electricity
Pressure transformer secondary connects the High Precision Low Temperature ticket film sampling resistor in 100 Europe, and the voltage sampling signal for accessing analog switch is AC
0~165mV (virtual value).
(2) signal switching circuit describes: due to the AC analogue signal that be switched signal is ± 200mV or so, so
The CD4053 of TI company is selected, which supports the switching of 20V AC analogue signal below, has lower conducting resistance
It is anti-, support 3 channel single-pole double-throw switch (SPDT)s.Analog switch 3 control foot ABC are connected to a GPIO of CPU, to control simultaneously
3 channels switch the 1st road voltage sampling signal of access simultaneously and still access the 2nd road voltage sampling signal.
2. software description
(1) new configuration parameter design: designing new parameter channelSet according to demand, the totally 9 kinds of values of value 0~8, represents the
The quantity (corresponding relationship such as following table) of the corresponding current channel of 1 voltage channel can configure the parameter by communication, and program is according to this
The switching of state modulator hardware corridor and the acquisition and configuration of 9 sets of parameters that calibrate for error.
| channelSet | 1st road voltage channel corresponding current | 2nd road voltage channel corresponding current |
| 0 | It is useless | The road 1-8 current channel |
| 1 | 1st road current channel | The road 2-8 current channel |
| 2 | The road 1-2 current channel | The road 3-8 current channel |
| 3 | The road 1-3 current channel | The road 4-8 current channel |
| 4 | The road 1-4 current channel | The road 5-8 current channel |
| 5 | The road 1-5 current channel | The road 6-8 current channel |
| 6 | The road 1-6 current channel | The road 7-8 current channel |
| 7 | The road 1-7 current channel | 8th road current channel |
| 8 | The road 1-8 current channel | It is useless |
(2) switch method of remote signal: program needs to control the switch state of analog switch according to the value of channelSet, thus
Switching wherein voltage sampling signal access system all the way.Analog switch totally 8, be 3 channel single-pole double-throw switch (SPDT)s, 3 channels the 1st
Access point is respectively connected to the ABC three-phase voltage sampled signal of the 1st road voltage channel, and the 2nd access point of 3 channel is respectively connected to the 2nd tunnel
The ABC three-phase voltage sampled signal of voltage channel, program control strobe pin CSMN by GPIO, and low level gates the 1st road electricity
Sampled signal access is pressed, the voltage of the access of the 2nd road voltage signal of high-level strobe, the 8 tunnels metering road sampled input signal Zhong Mei is adopted
Sample signal is controlled using same method, to achieve the effect that 2 road voltages and 8 road current sampling signals arbitrarily match.
(3) new to cover the parameter access that calibrates for error: for 0~8, totally 9 kinds of values, corresponding 9 kinds of analog switches switch channelSet more
State, although analog switch impedance very little, since the design requires measuring accuracy to be better than 0.2s grades, so analog switch is cut
By 9 kinds of voltage sampling signals that correspondence is different after changing, in order to meet required precision, 9 error schools are carried out for 9 kinds of sampled signals
Quasi- process, and its calibration parameter is stored respectively.When channelSet changes, process control analog switch switching signal state,
Corresponding calibration parameter is re-write into metering system simultaneously, is superior to 0.2s grades to meet every kind of combination measuring accuracy.
Claims (3)
1. the electrical energy measurement scheme of a kind of voltage, currents combination flexibly configurable provides a kind of analog switch+software exchange control
System+error trims the system scheme of algorithm, realizes station institute's terminal line loss module for electrical energy measurement value flexible configuration at not
With the combination of voltage and current, which can be realized by communication interface, meet the actual demand of user at the scene.
2. the electrical energy measurement scheme of a kind of voltage according to claim 1, currents combination flexibly configurable, feature exist
In: by using the double analog switches set of hilted broadsword, in 8 road current sampling signal of MCU process control and 2 road voltage sampling signals
Any to be combined all the way, combined quantity shares 9 kinds, and difference is as follows: the 1st road voltage channel --- the road 1-8 current channel,
2nd road voltage channel --- it is useless；1st road voltage channel --- the road 1-7 current channel, the 2nd road voltage channel --- the 8th road electricity
Circulation road；1st road voltage channel --- the road 1-6 current channel, the 2nd road voltage channel --- the road 7-8 current channel；1st tunnel
Voltage channel --- the road 1-5 current channel, the 2nd road voltage channel --- the road 6-8 current channel；1st road voltage channel --- the
The road 1-4 current channel, the 2nd road voltage channel --- the road 5-8 current channel；1st road voltage channel --- the road 1-3 electric current is logical
Road, the 2nd road voltage channel --- the road 4-8 current channel；1st road voltage channel --- the road 1-2 current channel, the 2nd road voltage
Channel --- the road 3-8 current channel；1st road voltage channel --- the 1st road current channel, the 2nd road voltage channel --- the road 2-8
Current channel；1st road voltage channel --- useless, the 2nd road voltage channel --- the road 1-8 current channel.
3. the electrical energy measurement scheme of a kind of voltage according to claim 1, currents combination flexibly configurable, feature exist
In: the error that an electrical energy measurement is done under the combination of each voltage and current, which is trimmed and stored, trims coefficient, in practical application
The switching state of combination control analog switch according to voltage and current channel simultaneously calls that corresponding to trim coefficient corresponding to carry out
Electrical energy measurement, it is ensured that the energy metering accuracy of each voltage and current combination is all satisfied index request.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521280A (en) * | 2019-01-07 | 2019-03-26 | 国网山东综合能源服务有限公司 | Line loss acquisition device, system and method |
| CN111007297A (en) * | 2019-11-15 | 2020-04-14 | 积成电子股份有限公司 | Multi-loop voltage distribution and selection circuit and implementation method thereof |
| CN112730973A (en) * | 2020-12-24 | 2021-04-30 | 上海贝岭股份有限公司 | Electric energy metering chip and electric energy metering device |
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| WO1983003011A1 (en) * | 1982-02-25 | 1983-09-01 | Scientific Columbus Inc | Multi-function electricity metering transducer |
| CN201060236Y (en) * | 2007-07-12 | 2008-05-14 | 江南大学 | Combination type power load accurate measurement device circuit structure |
| CN103884907A (en) * | 2014-03-31 | 2014-06-25 | 深圳市中电电力技术股份有限公司 | Sampling device, method and system for multi-loop electricity meter of electric power distribution cabinet |
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| CN106226723A (en) * | 2016-07-12 | 2016-12-14 | 中国电力科学研究院 | A kind of electric energy metrical sunykatuib analysis system and method towards complex nonlinear load environment |
| CN107741530A (en) * | 2017-10-10 | 2018-02-27 | 珠海许继电气有限公司 | A kind of release unit that management through quantification is realized to line loss, system and implementation method |
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| WO1983003011A1 (en) * | 1982-02-25 | 1983-09-01 | Scientific Columbus Inc | Multi-function electricity metering transducer |
| CN201060236Y (en) * | 2007-07-12 | 2008-05-14 | 江南大学 | Combination type power load accurate measurement device circuit structure |
| CN103884907A (en) * | 2014-03-31 | 2014-06-25 | 深圳市中电电力技术股份有限公司 | Sampling device, method and system for multi-loop electricity meter of electric power distribution cabinet |
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| CN106226723A (en) * | 2016-07-12 | 2016-12-14 | 中国电力科学研究院 | A kind of electric energy metrical sunykatuib analysis system and method towards complex nonlinear load environment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521280A (en) * | 2019-01-07 | 2019-03-26 | 国网山东综合能源服务有限公司 | Line loss acquisition device, system and method |
| CN111007297A (en) * | 2019-11-15 | 2020-04-14 | 积成电子股份有限公司 | Multi-loop voltage distribution and selection circuit and implementation method thereof |
| CN112730973A (en) * | 2020-12-24 | 2021-04-30 | 上海贝岭股份有限公司 | Electric energy metering chip and electric energy metering device |
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