CN102841247A - Detection method for grid frequency - Google Patents
Detection method for grid frequency Download PDFInfo
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- CN102841247A CN102841247A CN2012103168679A CN201210316867A CN102841247A CN 102841247 A CN102841247 A CN 102841247A CN 2012103168679 A CN2012103168679 A CN 2012103168679A CN 201210316867 A CN201210316867 A CN 201210316867A CN 102841247 A CN102841247 A CN 102841247A
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- 230000002045 lasting effect Effects 0.000 description 4
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Abstract
The invention discloses a detection method for grid frequency, which mainly comprises the following steps of: (1) connecting a test power supply to a detection circuit, wherein the test power supply can generate a string of square wave signals corresponding to the grid frequency of the test power supply after being subjected to voltage reducing treatment by the detection circuit; (2) obtaining a time difference value Delta t1 of the square wave signals from rising edge interruption to first falling edge interruption by a micro-controller; (3) comparing a sine wave half-cycle time value T0 corresponding to the frequency of 200HZ with the value of Delta t1 to determine whether to store or not; (4) as described in the step (2), obtaining a time difference value Delta t2 of the square wave signals from rising edge interruption to first falling edge interruption by the micro-controller; (5) comparing the sine wave half-cycle time value T0 corresponding to the frequency of 200HZ with the value of Delta t2 to determine whether to store or not; and (6) calculating a cycle actual time value T and grid frequency according to the values of Delta t1 and Delta t2. With the adoption of the detection method, both the standard sine wave input grid frequency and the voltage stabilization precision difference grid frequency can be detected.
Description
Technical field
The present invention relates to electrical technology field, specifically be meant a kind of detection method of line voltage frequency of operation.
Background technology
In electric system; Mains frequency is one of the quality of power supply three big indexs; The frequency response of electrical network the generating active power and the load between equilibrium relation; Be the important control parameter of Operation of Electric Systems, the fluctuation of frequency can cause the guide vanes of water turbine of generating set to destroy, and speed regulator is the degradation consequence under serviceable life.For the user; Although many subscriber equipmenies can be in wider frequency operate as normal, along with science and technology development, electronic equipment and precise machining equipment that some are new are had higher requirement to electrical network; The fluctuation of frequency can make user's product quality descend or device damage.Therefore, mains frequency is the main monitored parameter of electric equipment operations such as motor.
Traditional digitizing power supply; UPS (Uninterruptible Power Supply for example; Uninterrupted electric power supply) power supply, EPS (Emergency Power Supply; The emergency power supply) power supply, inverter or the like; Its mains frequency detection method is to handle the back through step-down and produce a string square-wave signal corresponding with mains frequency civil power is sinusoidal wave mostly, and square-wave signal is input to the external interrupt input port or the input capture mouth of microcontroller, detects frequency signal whether within normal range by the interrupt routine of microcontroller software.
Microcontroller is all interrupted by rising edge usually or negative edge interrupts catching the corresponding timer time value of square-wave signal; Interrupting (perhaps negative edge interruption) with twice rising edge catches and obtains the periodic quantity T that the timer time difference calculates the sinusoidal wave respective frequencies signal of civil power; 1/T reciprocal through periodic quantity tries to achieve the sinusoidal wave frequency values of civil power at last, and the scope of normal mains frequency is between 45HZ to 65HZ.
Can know through last surface analysis, when the civil power of input when being standard of comparison sinusoidal wave detected mains frequency and periodic quantity be more accurately; But will about the sine wave signal zero crossing, produce a lot of burrs when generating electricity when the supply voltage lasting accuracy difference of input or by diesel-driven generator; The square-wave signal of microcontroller input produces the noise square-wave signal about zero crossing like this; The sine wave freuqency and the periodic signal that cause going out with traditional technique in measuring are undesired; It is very big to float, and can not effectively detect its frequency.
If therefore we will be (particularly in the very poor countries and regions of electrical network under the situation of input electrical network line voltage lasting accuracy difference with the frequency of traditional method detection; Diesel-driven generator generating commonly used) causes the machine cisco unity malfunction; Be operated in the pattern of non-mains-supplied, to machine performance and life-span considerable influence always.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of detection method of mains frequency be provided, with satisfy can examination criteria sine wave input mains frequency, also can effectively detect the mains frequency of voltage lasting accuracy difference.
The objective of the invention is to realize through following technical scheme:
A kind of detection method of mains frequency may further comprise the steps:
1) testing power supply is inserted testing circuit, testing power supply is handled the back through the testing circuit step-down and is produced a string square-wave signal corresponding with the testing power supply mains frequency;
2) microcontroller obtains square-wave signal from the time difference Δ t between rising edge interruption to the negative edge interruption for the first time
1
3) according to Δ t
1Whether less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0Judge whether to store said time difference Δ t
1:
If Δ t
1More than or equal to T
0, then store Δ t
1
If Δ t
1Less than T
0, then temporarily do not store Δ t
1, microcontroller obtains from step 2 again) and said rising edge interrupts increasing progressively time negative edge time difference Δ t between interrupting to natural number
1, until Δ t
1Greater than T
0, stop to increase progressively, preserve Δ t
1Value;
4) microcontroller obtains square-wave signal from step 2) said first time negative edge interrupt to the time difference Δ t between rising edge interrupts next time
2
5) according to Δ t
2Whether less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0Judge whether to store said time difference Δ t
2:
If Δ t
2More than or equal to T
0, then store Δ t
2
If Δ t
2Less than T
0, then temporarily do not store Δ t
2, microcontroller obtains from step 2 again) said first time negative edge interrupt increasing progressively the time difference Δ t of time rising edge between interrupting to natural number
2, until Δ t
2Greater than T
0, stop to increase progressively, preserve Δ t
2Value;
6) according to Δ t
1, Δ t
2The value computation period real time is worth T, and calculates mains frequency f according to real time in the cycle value T that calculates.
Concrete, said microcontroller is provided with external interrupt mouth or the input capture mouth that rising edge interrupts and negative edge interrupts, and the external interrupt mouth of microcontroller or input capture mouth are connected with testing circuit mains frequency square wave delivery outlet.
Concrete, said microcontroller is provided with the rising edge and the negative edge that are used for square wave and all produces the interrupt software of interruption.
Concrete, said microcontroller also is provided with the timer that is used to calculate the time between the interruption.
Concrete, said microcontroller obtains square-wave signal and interrupts to the time difference Δ t between negative edge interrupts for the first time from rising edge
1Concrete steps be:
Interrupt software is provided with rising edge and interrupts triggering software interruption when microcontroller is started shooting;
Square-wave signal gets into rising edge for the first time and interrupts, and the interrupt routine setting is interrupted interrupting and the timer timing of starting from scratch being set for the signal negative edge next time, and preserving this moment timer value is t
0
Square-wave signal gets into negative edge and interrupts, and this moment, timer value was t
n, calculate this time Abort Timer tn value and said rising edge interruption preservation first time timer t
0The time difference Δ t of value
1=t
n-t
0
Concrete, said according to Δ t
1, Δ t
2Value computation period real time value T, and according to the concrete steps that real time in the cycle value T that calculates calculates mains frequency f be:
Through formula t=Δ t
1+ Δ t
2Draw the time value t in whole cycle;
Take advantage of to be worth according to the time value t in whole cycle to calculate sine wave period real time value T, calculate f by mains frequency f=1/T again in the timer unit interval.
Concrete, said timer unit interval value is the inverse of timer frequency of operation.
The present invention compares that prior art has the following advantages and beneficial effect:
The inventive method satisfy can examination criteria sine wave input mains frequency, also can detect the waveform signal that has burr that mains frequency, the especially diesel-driven generator of voltage lasting accuracy difference produce etc. can both quite good detecting go out its frequency and cycle.Can make ups power, EPS power supply, inverter etc. depend on the machine of civil power work can be under unsettled electrical network operate as normal.
Description of drawings
Fig. 1 is a detection method schematic flow sheet of the present invention.
Fig. 2 is the circuit diagram of the testing circuit of testing power supply access of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is described in further detail, but embodiment of the present invention is not limited thereto.
Embodiment 1
As shown in Figure 2, the L line of testing power supply, N line insert testing circuit, and external interrupt mouth or input capture mouth through microcontroller are connected on the testing circuit MCU frequency detecting input port.
As shown in Figure 1, a kind of mains frequency detection method is characterized in that, may further comprise the steps:
1) rising edge is set and interrupts triggering the microcontroller software interruption when microcontroller is started shooting;
2) square-wave signal gets into rising edge for the first time and interrupts, and in the microcontroller interrupt software, is provided with to interrupt for the interruption of signal negative edge next time and the timer timing of starting from scratch is set, and the preservation timer value is t
0
3) square-wave signal gets into the negative edge interruption, and this moment, timer value was t
n, calculate Abort Timer value t this time
nInterrupt preserving timer t with last rising edge
0The time difference Δ t of value
1=t
n-t
0, and judge that whether this time difference is less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0:
In this enforcement row, time difference Δ t
1Greater than T
0, software is preserved and is detected time difference Δ t specifically
1And timer tn value, and setting interruption next time is that the signal rising edge interrupts;
4) square-wave signal gets into the rising edge interruption once more, and this moment, timer value was t
N+1, calculate Abort Timer t this time
N+1Value and last negative edge interrupt preserving timer t
nThe time difference Δ t of value
2=t
N+1-t
n, and judgement time difference DELTA t
2Whether less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0:
In the present embodiment, time difference Δ t
2Less than T
0, software is not preserved current detected time difference and timer t
N+1Value, and interruption next time is set still for the signal rising edge interrupts, return above-mentioned steps 3) operation, until time difference Δ t
2Greater than T
0, software is preserved current detected time difference Δ t
2And timer t
N+1Value, and be provided with and interrupt getting into step 5) then and operating for the signal rising edge interrupts next time;
5) get the time value t=Δ t in whole cycle through formula
1+ Δ t
2, simultaneously take advantage of to be worth to calculate sine wave period real time value T in the timer unit interval according to time value t, calculate through formula mains frequency ff=1/T after drawing T.Be provided with and interrupt next time, the timer timing of starting from scratch is set once more, and the preservation timer value is t for the signal negative edge interrupts
0, interrupt returning step 3) next time and begin to carry out;
6) return repeating step 3) to step 5), just can detect a plurality of mains frequency value f and periodic quantity T.
Concrete, said timer unit interval value is the inverse of timer frequency of operation.
Embodiment 2
As shown in Figure 2, the L line of testing power supply, N line insert testing circuit, and external interrupt mouth or input capture mouth through microcontroller are connected on the testing circuit MCU frequency detecting input port.
As shown in Figure 1, a kind of mains frequency detection method is characterized in that, may further comprise the steps:
1) rising edge is set and interrupts triggering the microcontroller software interruption when microcontroller is started shooting;
2) square-wave signal gets into rising edge for the first time and interrupts, and in interrupt routine, is provided with to interrupt for the interruption of signal negative edge next time and the timer timing of starting from scratch is set, and the preservation timer value is t
0
3) square-wave signal gets into the negative edge interruption, and this moment, timer value was t
n, calculate Abort Timer t this time
nValue and last rising edge interrupt preserving timer t
0The time difference Δ t of value
1=t
n-t
0, and judge that whether this time difference is less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0:
In this enforcement row, time difference Δ t
1Less than T
0, software is not preserved current detected time difference Δ t
1, and interruption next time is set still for the signal negative edge interrupts, and return above-mentioned steps 3) operation, until time difference Δ t
1Greater than T
0, software is preserved current detected time difference Δ t
1And timer t
nValue, and be provided with and interrupt getting into step 4) then and operating for the signal rising edge interrupts next time;
4) square-wave signal gets into the rising edge interruption once more, and this moment, timer value was t
N+1, calculate Abort Timer t this time
N+1Value and last negative edge interrupt preserving timer t
nThe time difference Δ t of value
2=t
N+1-t
n, and judgement time difference DELTA t
2Whether less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0:
Present embodiment time difference Δ t
2Less than T
0, software is not preserved current detected time difference Δ t
2, and interruption next time is set still for the signal rising edge interrupts, and return above-mentioned steps 4) operation, until time difference Δ t
2Greater than T
0, software is preserved current detected time difference Δ t
2And timer t
N+1Value, and be provided with and interrupt getting into step 5) then and operating for the signal rising edge interrupts next time;
5) get the time value t=Δ t in whole cycle through formula
1+ Δ t
2, simultaneously take advantage of to be worth to calculate sine wave period real time value T in the timer unit interval according to time value t, calculate through formula mains frequency f=1/T after drawing T.Be provided with and interrupt next time, the timer timing of starting from scratch is set once more, and the preservation timer value is t for the signal negative edge interrupts
0, interrupt returning step 3) next time and begin to carry out;
6) return repeating step 3) to step 5), just can detect a plurality of mains frequency value f and periodic quantity T.
Concrete, said timer unit interval value is the inverse of timer frequency of operation.
The foregoing description is a preferred implementation of the present invention; But embodiment of the present invention is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. the detection method of a mains frequency is characterized in that, may further comprise the steps:
1) testing power supply is inserted testing circuit, testing power supply is handled the back through the testing circuit step-down and is produced a string square-wave signal corresponding with the testing power supply mains frequency;
2) microcontroller obtains square-wave signal from the time difference Δ t between rising edge interruption to the negative edge interruption for the first time
1
3) according to Δ t
1Whether judge whether to store said time difference less than the corresponding sinusoidal wave semiperiod time value T0 of 200HZ frequency:
If Δ t
1More than or equal to T0, then store Δ t
1
If Δ t
1Less than T0, then temporarily do not store Δ t
1, microcontroller obtains from step 2 again) and said rising edge interrupts increasing progressively time negative edge time difference Δ t between interrupting to natural number
1, until Δ t
1Greater than T0, stop to increase progressively, preserve Δ t
1Value;
4) microcontroller obtains square-wave signal from step 2) said first time negative edge interrupt to the time difference Δ t between rising edge interrupts next time
2
5) according to Δ t
2Whether less than the corresponding sinusoidal wave semiperiod time value T of 200HZ frequency
0Judge whether to store said time difference Δ t
2:
If Δ t
2More than or equal to T0, then store Δ t
2
If Δ t
2Less than T0, then temporarily do not store Δ t
2, microcontroller obtains from step 2 again) said first time negative edge interrupt increasing progressively the time difference Δ t of time rising edge between interrupting to natural number
2, until Δ t
2Greater than T0, stop to increase progressively, preserve Δ t
2Value;
6) according to Δ t
1, Δ t
2The value computation period real time is worth T, and calculates mains frequency f according to real time in the cycle value T that calculates.
2. according to the detection method of the said mains frequency of claim 1; It is characterized in that: said microcontroller is provided with external interrupt mouth or the input capture mouth that rising edge interrupts and negative edge interrupts, and the external interrupt mouth of microcontroller or input capture mouth are connected with testing circuit mains frequency square wave delivery outlet.
3. according to the detection method of the said mains frequency of claim 2, it is characterized in that: said microcontroller comprises that the rising edge and the negative edge that are used for square wave all produce the interrupt software of interruption.
4. according to the detection method of the said mains frequency of claim 3, it is characterized in that: said microcontroller also is provided with the timer that is used to calculate the time between the interruption.
5. according to the detection method of the said mains frequency of claim 4, it is characterized in that said microcontroller obtains square-wave signal and interrupts to the time difference Δ t between negative edge interrupts for the first time from rising edge
1Concrete steps be:
Interrupt software is provided with rising edge and interrupts triggering software interruption when microcontroller is started shooting;
Square-wave signal gets into rising edge for the first time and interrupts, and the interrupt routine setting is interrupted interrupting and the timer timing of starting from scratch being set for the signal negative edge next time, and the preservation timer value is t0;
Square-wave signal gets into negative edge and interrupts, and this moment, timer value was tn, calculated Abort Timer t this time
nThe time difference Δ t of timer t0 value is preserved in value and the said rising edge interruption first time
1=t
n-t
0
6. according to the detection method of the said mains frequency of claim 5, it is characterized in that: said according to Δ t
1, Δ t
2Value computation period real time value T, and according to the concrete steps that real time in the cycle value T that calculates calculates mains frequency f be:
Through formula t=Δ t
1+ Δ t
2Draw the time value t in whole cycle;
Take advantage of to be worth according to the time value t in whole cycle to calculate sine wave period real time value T, calculate f by mains frequency f=1/T again in the timer unit interval.
7. according to the detection method of the said mains frequency of claim 6, it is characterized in that: said timer unit interval value is the inverse of timer frequency of operation.
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|---|---|---|---|
| CN201210316867.9A CN102841247B (en) | 2012-08-30 | 2012-08-30 | Detection method for grid frequency |
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|---|---|---|---|
| CN201210316867.9A CN102841247B (en) | 2012-08-30 | 2012-08-30 | Detection method for grid frequency |
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| Publication Number | Publication Date |
|---|---|
| CN102841247A true CN102841247A (en) | 2012-12-26 |
| CN102841247B CN102841247B (en) | 2015-02-18 |
Family
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