CN109782059A - A kind of method of the accurate reversed active energy of metering - Google Patents
A kind of method of the accurate reversed active energy of metering Download PDFInfo
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Abstract
The invention discloses the methods that one kind accurately measures reversed active energy, comprising the following steps: (1) reads, read the value of average active power register WATT (0AH)；(2) judge, judge the positive and negative attribute of the value of the average active power register WATT (0AH), be such as negative, then determine that electricity reversely adds up.Reversed active energy can accurately be measured using this method, False Rate is reduced, the accuracy or accuracy of electric energy meter metering is effectively increased, improves the stability and reliability of electric energy meter, be conducive to power department and accurately grasp electric load situation in power grid, rationally carries out power scheduling.
Description
Technical field
The invention belongs to the technical fields of electronic electricity meter, and in particular to a method of accurately measure reversed active energy.
Background technique
Electric energy meter is the instrument that modern society is used to measure electric energy, as the various electricity consumptions such as family, office and factory
Metrical instrument is widely used, and power office counts according to electricity consumption of the electric energy meter to each user.Existing electric energy meter
In, electronic electric energy meter, also known as static electric energy meter, solid state electric energy meter, by being adopted in real time to customer power supply voltage and current
Sample, using dedicated electric energy meter integrated circuit, sampled voltage and current signal are handled and be multiplied be converted into electric energy at
The pulse of direct ratio exports, the physical instrument shown by register or digital display, since it is relative to mechanical power energy meter
Compared to having a clear superiority: as anti-electricity-theft ability is strong, measuring accuracy is high, part throttle characteristics is preferable, error curve is straight, power factor is mended
Performance is repaid compared with strong, oneself power consumption is low, especially its measuring parameter flexibility is good, it is more etc. to derive from function, therefore this electric energy meter
Constantly is studied and developed, the continuous development and maturation of electronic electric energy meter technology, the accuracy of measuring and function of electric energy meter
Also in constantly raising and maturation.Other than the precision and stability of the metering circuit and component of metering chip and its periphery,
Also time-sharing measurement can be realized by the software function of electronic electric energy meter, have the function that peak load shifting, alleviate power generation department and
The load pressure of electric administrative department power grid, it is possible to use family has obtained material benefit.
In electronic electric energy meter, critical component: electric energy computation chip can be used, different metering chips is anti-in processing
To active mode or method there are different, for example:
(1) RN8209 of Shenzhen Rui Nengwei company and the reversed instruction of the IDT90E2x electric energy computation chip of Integrated Device Technology, Inc. processing
Revp method are as follows: when detecting negative active power, which is 1, and when detecting positive active power again, which is 0,
The value is updated in CF pulse out, moment reverse interference is easy to remove in this way；
(2) the status register STATUS function literal sense of the BL6523A of company, Shanghai Belling is interrupt status register, is
For when interrupt event generates, user can inquire the event of generation by status register, specifically, in status register
Reversed indicating bit Revp, chip interior is according to the whether reversed triggering in real time of power, once reversed indicating bit Revp becomes from " 0 "
After " 1 ", status register was only after user read its value, if reversed event did not trigger just to remove again becomes " 0 ".
If read status register STATUS, status register STATUS do not keep original value to user's single-chip microprocessor MCU.
Using in above-mentioned metering chip, in practical applications or can there are problems that an erroneous judgement:
The reversed instruction Revp of IDT90E2x electric energy computation chip processing of the RN8209 and Integrated Device Technology, Inc. of Shenzhen Rui Nengwei company
Method, actual metered can have problem, if most of time is negative work before CF pulse out, CF pulse time-varying is positive work out,
Then single-chip microprocessor MCU can be negative work meter Cheng Zhenggong.
The reversed indicating bit Revp method of the status register STATUS of the BL6523A of company, Shanghai Belling, is easy to produce
When the equipment electricity consumption of moment reversed electricity, the value of the every 1 second read status register STATUS of single-chip microprocessor MCU is readily available reversely
Indicating bit Revp is " 1 ", and single-chip microprocessor MCU can judge reversed electricity consumption instruction by accident.
Therefore, using the reversed flag bit for reading interrupt status register to determine whether there is reversed this mode is to deposit
In problem, by taking electromagnetic oven in the market as an example, when electromagnetic oven carries out Switching Power Supply, the backward energy register of metering chip
Value increases, and illustrates there is moment reversed possibility in switching moments, metering chip provides reversed mark；If do not added using homemade
Protect the coil of the adjusting electric current of circuit, meter be possible to read reversed flag bit all in continuous 4 seconds be it is reversed, oscillograph crawl
This it appears that the phase difference of Current Voltage is more than 90 degree, active power is implicitly present in reversely for electric current and voltage waveform.(mesh
The preceding phenomenon is principally found in inductive load).And in power grid, electrical equipment is more complicated compared to single electromagnetic oven, hanging net operation
When electrical equipment switch it is more frequent, there are the reversed probability of instantaneous power is higher, the reversed mark of interrupt status register
Position can all capture these reversed events.As long as once wink in the time interval of twi-read interrupt status register
Between reversed event reversed indicating bit REVP can be all set to " 1 ", single-chip microprocessor MCU can judge reversed electricity consumption instruction by accident, to reversely count
The electric energy of amount can be bigger than normal.
Therefore it needs to improve existing metering method.
Summary of the invention
The purpose of the present invention is to solve the above problems, provide a kind of method for accurately measuring reversed active energy, adopt
With the value for reading average active power register WATT (0AH), it is worth with it positive and negative to determine whether reversed.
In order to achieve the above object of the invention, the invention adopts the following technical scheme:
A kind of method of the accurate reversed active energy of metering, comprising the following steps:
(1) it reads, reads the value of average active power register；
(2) judge, judge the positive and negative attribute of the value of the average active power register, be such as negative, then determine that electricity is anti-
To accumulative.Count the accumulative electricity of the direction, as the end of month that ammeter is accumulated to one month since electricity consumption be the month it is reversed
Active electricity consumption total amount.
It further, further include the setting of reading time interval in the step (1), specifically, a read access time is preset,
The reading of the value of an average active power register is carried out every a read access time.Default read access time section is generally set to 1
Second.
Further, in the step (2) to the positive and negative determined property of the value of the average active power register specifically,
Judge the positive and negative attribute of the highest order of the value of the average active power register.
Further, the step of this method (2) specifically:
When the value for reading average active power register is negative, judge whether the value of reversed accumulative register meets the
One preset condition such as meets the first preset condition, then determines that electricity reversely adds up.
Further, whether the value of the reversed accumulative register of judgement meets the first preset condition specifically:
(21) first threshold and low current of presetting reversed accumulative register reversely add up the second threshold of register value；
(22) compare the size of the absolute value performance number corresponding with starting current of the value of active power register；Wherein,
When the absolute value of the value of active power register performance number corresponding more than or equal to starting current, if described
Reversely accumulative register value is less than first threshold, then reversely accumulative register value adds 1, and low current reversely adds up register and resets；
When the absolute value of the value of active power register performance number corresponding less than starting current, low current reversely adds up
Register value adds 1, then judge low current reversely add up register value whether be greater than or equal to second threshold, if it is greater than or wait
In second threshold, then low current reversely adds up register and resets, and reversely accumulative register value is if it is less than first threshold, then plus 1；
(23) reversely whether accumulative register value is added to more than or equal to first threshold for judgement, such as larger than or equal to first
Threshold value, then set reversely indicates.
Further, the step of this method (2) further include: when the value for reading average active power register is positive
When, judge whether the value of reversed accumulative register meets the second preset condition, such as meet the second preset condition, determines that there is no electricity
Amount is reversed accumulative.
Further, whether the value of the reversed accumulative register of the judgement meets the second preset condition specifically:
(a) reversely whether accumulative register value is greater than 1 for judgement, such as larger than then subtracts 1, low current reversely adds up the value of register
It resets；
(b) when the value of reversed accumulative register decreases ultimately to 0, then set forward direction mark.
Reversely add up register value (ii) in the present invention and refers to that the MCU of electric energy meter reads average active power register
The value of WATT (0AH) is positive or negative number.First threshold refers to the value for reading average active power register WATT (0AH)
For positive or negative number, it is positive or negative number that the MCU for referring specifically to electric energy meter, which reads the value of WATT (0AH),.Second threshold
It is the judgement to the value for reading WATT (0AH) for positive or negative number, low current reversely adds up register (jj) setting second
Threshold value, judge when low current it is forward and reverse increase serial number jj one small, be added to clear after setting value i.e. second threshold
Zero can just add up to big serial number ii.It does so the judgement in small signal and increases judgement number, while the time measured
Also it extends, ensure that the accuracy of judgement.Reversely accumulative register is equal to a high position, and low current reversely adds up register and is equal to
Low level, positive and negative (i.e. sign bit) using reversed accumulative register judge that electricity reversely adds up.
Compared with prior art, the present invention beneficial effect is:
1 can accurately measure reversed active energy using this method, reduce False Rate, effectively increase the standard of electric energy meter metering
True property or accuracy；
2. this method is used, so that the stability and reliability of electric energy meter gauging of products electric energy are improved；
3. adding up and resetting design by register, excessive meaningless statistics is avoided, this method is improved and is applied
Product quality and service life；
4. accurately metering direction active energy is conducive to power department and accurately grasps electric load situation in power grid, closes
Reason carries out power scheduling.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram for the method that can accurately measure reversed active energy of the present invention；
Fig. 2 is a kind of functional block diagram for the method that can accurately measure reversed active energy of the present invention.
Specific embodiment
Below by specific embodiment the technical scheme of the present invention will be further described explanation so that the technical program is more
Add clear, clear.
Embodiment 1
Present embodiment discloses a kind of methods that can accurately measure reversed active energy, as shown in Figure 1, including following step
It is rapid:
(1) it reads, reads the value of average active power register WATT (0AH)；
(2) judge, judge the positive and negative attribute of the value of the average active power register WATT (0AH), be such as negative, then sentence
Determine electricity reversely to add up.
As shown in Fig. 2, being illustrated in conjunction with design parameter, the method that the present embodiment processing reversely indicates are as follows:
The MCU of electric energy meter reads the value of average active power register WATT (0AH), is worth with it positive and negative to determine whether anti-
To.The value that (average active power register WATT refresh rate is 10Hz) reads average active power register WATT for every 1 second, sentences
Its value of breaking is positive and negative, and the value that such as continuous 4 times (preset times 4) read average active power register WATT is negative, then it is assumed that electricity
Amount is reversed accumulative.The method namely in a program changes read status register into and reads average active power register, root
It is positive and negative to judge according to the highest order (sign bit) of average active power register.
1 second in the present embodiment, 4 seconds these specific times can independently can set according to practical service environment and demand
It sets.
In this way, on the basis of existing status register, change without excessive, pass through MCU pairs of electric energy meter
The reading data and control of average active power register on electric energy computation chip.
Specifically, this method includes the following steps:
A) reading average active power register per second；
B) judge the positive and negative of average active power register value；
C) when average active power register value is timing, reversely accumulative register value ii then subtracts 1, small electricity if it is greater than 1
Reversely accumulative register jj is reset stream；
When average active power register value is negative, compare the absolute value and starting current of the value of active power register
Corresponding performance number is divided into following 2 kinds of situations:
1) if the absolute value of active power register is more than or equal to the corresponding performance number of starting current, reversed accumulative deposit
Device value ii is if it is less than 4, then plus 1, low current reversely adds up register jj and resets；
If 2) absolute value of active power register is less than the corresponding performance number of starting current, low current reversely adds up to post
Storage jj value adds 1, judges that low current reversely adds up whether register jj value is more than or equal to 4, if it is larger than or equal to 4, low current is anti-
It is reset to accumulative register jj, reversely accumulative register value ii is if it is less than 4, then plus 1.
D) reversely whether accumulative register value ii is more than or equal to 4 for judgement, and if it is larger than or equal to 4, then set reversely indicates；Such as
Fruit is equal to zero, then set forward direction mark.
In the present embodiment, what reversed accumulative register was recorded is read with prefixed time interval (reading for i.e. every 1 second primary)
Value to average active power register WATT is positive or negative number；For example it was read once in continuous 4 times with every 1 second
Frequency reads the value of average active power register WATT, and the value of 4 readings is all positive, then reversely accumulative register ii value is equal to
4.The present embodiment small current reversely adds up the accumulative number of register and adds up the identical (the two of the number setting of register with reversed
May be set to be difference), i.e. first threshold and second threshold is all set as 4；It is less than in the absolute value of active power register and opens
When the corresponding performance number of streaming current, when the value jj value (number namely counted on) that low current reversely adds up register be equal to it is pre-
If second threshold 4 when, carry out the clearing that low current reversely adds up register, then reversely accumulative register ii just carries out adding 1
Processing；The process is constantly accumulative, and when reversed accumulative register value ii is accumulated to equal to 4, set reversely indicates, determines that electricity is anti-
To accumulative.
The above are the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited, for those skilled in the art
The deformation and improvement that member's mentality of designing according to the present invention is made, design a lot of other modification and implementations, these are repaired
Changing will fall within scope and spirit disclosed in the present application with embodiment.More specifically, it discloses in the application, attached drawing
In the scope of the claims, can building block to theme combination layout and/or layout carry out a variety of variations and modifications.It removes
Outside the variations and modifications carried out to building block and/or layout, to those skilled in the art, other purposes also will
It is apparent.
Claims (7)
1. the method that one kind accurately measures reversed active energy, which comprises the following steps:
(1) it reads, reads the value of average active power register；
(2) judge, judge the positive and negative attribute of the value of the average active power register, be such as negative, then determine that electricity reversely tires out
Meter.
2. the method that one kind according to claim 1 accurately measures reversed active energy, which is characterized in that the step
(1) further include the setting of reading time interval in, specifically, presetting a read access time, once put down every a read access time
The reading of the value of equal active power register.
3. the method that one kind according to claim 1 or 2 accurately measures reversed active energy, which is characterized in that the step
Suddenly to the positive and negative determined property of the value of the average active power register in (2), specifically, judging the average active power
The positive and negative attribute of the highest order of the value of register.
4. the method that one kind according to claim 1 or 2 accurately measures reversed active energy, which is characterized in that step (2)
Specifically:
When the value for reading average active power register is negative, it is pre- to judge whether the value of reversed accumulative register meets first
If condition, such as meets the first preset condition, then determine that electricity reversely adds up.
5. the method that one kind according to claim 4 accurately measures reversed active energy, which is characterized in that judgement is reversed tired
Whether the value of meter register meets the first preset condition specifically:
(21) first threshold and low current of presetting reversed accumulative register reversely add up the second threshold of register value；
(22) compare the size of the absolute value performance number corresponding with starting current of the value of active power register；
Wherein,
When the absolute value of the value of active power register performance number corresponding more than or equal to starting current, if described reversed
Accumulative register value is less than first threshold, then reversely accumulative register value adds 1, and low current reversely adds up register and resets；
When the absolute value of the value of active power register performance number corresponding less than starting current, low current reversely adds up deposit
Device value adds 1, then judges that low current reversely adds up whether register value is greater than or equal to second threshold, if it is greater than or be equal to the
Then low current reversely adds up register and resets two threshold values, and reversely accumulative register value is if it is less than first threshold, then plus 1；
(23) reversely whether accumulative register value is added to more than or equal to first threshold for judgement, such as larger than or equal to the first threshold
Value, then set reversely indicates.
6. the method that one kind according to claim 5 accurately measures reversed active energy, which is characterized in that flat when reading
The value of equal active power register is timing, judges whether the value of reversed accumulative register meets the second preset condition, is such as met
Second preset condition determines reversely to add up there is no electricity.
7. the method that one kind according to claim 6 accurately measures reversed active energy, which is characterized in that the judgement is anti-
Whether meet the second preset condition to the value of accumulative register specifically:
(a) reversely whether accumulative register value is greater than 1 for judgement, such as larger than then subtracts 1, the value that low current reversely adds up register is clear
Zero；
(b) when the value of reversed accumulative register decreases ultimately to 0, then set forward direction mark.
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Cited By (5)
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| CN110988461A (en) * | 2019-12-10 | 2020-04-10 | 杭州万高科技股份有限公司 | Electric energy metering method and electric energy metering device |
| CN112782470A (en) * | 2020-12-14 | 2021-05-11 | 浙江恒业电子有限公司 | Method and system for improving metering precision of three-phase cost control intelligent electric meter based on MCU |
| CN113065979A (en) * | 2021-03-22 | 2021-07-02 | 贵州电网有限责任公司 | Load report improving and self-checking method for dispatching automation system |
| CN114047380A (en) * | 2022-01-12 | 2022-02-15 | 华立科技股份有限公司 | Electric energy metering method and device and electric energy meter |
| CN116027102A (en) * | 2023-03-29 | 2023-04-28 | 深圳龙电华鑫控股集团股份有限公司 | Power calculation method and device of electric power instrument and electric power instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110988461A (en) * | 2019-12-10 | 2020-04-10 | 杭州万高科技股份有限公司 | Electric energy metering method and electric energy metering device |
| CN112782470A (en) * | 2020-12-14 | 2021-05-11 | 浙江恒业电子有限公司 | Method and system for improving metering precision of three-phase cost control intelligent electric meter based on MCU |
| CN113065979A (en) * | 2021-03-22 | 2021-07-02 | 贵州电网有限责任公司 | Load report improving and self-checking method for dispatching automation system |
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Address after: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province, 314200 Patentee after: Zhejiang Hengye Electronics Co.,Ltd. Address before: No. 1818, Xingping 1st Road, Pinghu Economic Development Zone, Jiaxing City, Zhejiang Province, 314200 Patentee before: ZHEJIANG HENGYE ELECTRONIC Co.,Ltd. |