CN112816913A - Method and device for rapidly detecting power failure of single-phase alternating voltage signal, storage medium, program product and terminal equipment - Google Patents
Method and device for rapidly detecting power failure of single-phase alternating voltage signal, storage medium, program product and terminal equipment Download PDFInfo
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Abstract
The invention comprises an algorithm, a device, a storage medium, a program product and a terminal device for rapidly detecting the power failure of a single-phase alternating voltage signal, which are used for sampling the single-phase alternating voltage and storing the single-phase alternating voltage into a storage space by opening up the storage space. And for the sampling voltage value, searching the voltage value of the corresponding phase in the previous period in the memory according to the phase, and after comparing the sampling voltage value with the voltage value, judging whether the power failure occurs or not according to the frequency of continuously searching the error threshold value by the error. The invention only uses limited memory, does not need to look up sine table or calculate trigonometric function, and the cost of CPU processor is low. According to the invention, through reasonable combination of the voltage error threshold and the timer threshold, the condition of non-sinusoidal voltage waveform in the actual power grid environment can be adapted, millisecond-level power failure response can be realized in the power grid environment with power grid voltage waveform distortion and large harmonic component in an industrial park or remote areas, the standby power supply can be rapidly and seamlessly switched, and stable operation of important loads is ensured.
Description
Technical Field
The invention relates to the technical field of unidirectional alternating current detection, in particular to a method and a device for rapidly detecting power failure of a single-phase alternating current voltage signal, a storage medium, a program product and terminal equipment.
Background
The power grid is safe and reliable in power supply, the development of industry and commerce is very important, when unexpected power failure occurs, millisecond-level power failure detection response is realized, the standby power supply is quickly and seamlessly switched, and the stable application of important loads is guaranteed. In control systems of equipment such as UPS, EPS emergency power supply, smart grid and the like, whether input alternating voltage is in power failure needs to be detected quickly, so that the core product function of quickly responding to power grid abnormity and performing quick seamless switching is realized.
In the prior art, the power failure rapid detection of the three-phase alternating voltage has a relatively mature algorithm, and almost the same power failure response time can be realized in the power failure of any three-phase. However, it is difficult to realize the fast detection performance for the fast detection of the power failure of the single-phase alternating-current voltage. At present, the following two methods are mainly used for detecting the single-phase alternating-current voltage:
the method comprises the following steps: and (4) drawing a line and detecting. And comparing the sampled real-time voltage with a threshold value set by software, and when the real-time voltage value is lower than the threshold value continuously, determining that the voltage is powered down. The method cannot accurately match the sine change characteristics of the single-phase alternating-current voltage, and has the problem that the threshold value and the filtering time cannot be set to adapt to power failure at different phase moments. In engineering practice, a multi-section line drawing method is often implemented, meanwhile, the condition of preventing misjudgment is also considered, the filtering time cannot be set too short, the overall scheme is complex, the quick response performance cannot be realized, and the detection switching time cannot be shorter than 15 milliseconds.
The second method comprises the following steps: sine table detection method. And comparing the sampled instantaneous voltage value with a reference sine table in software, and when the voltage value is smaller than the corresponding numerical value in the sine table continuously, determining that the power grid is powered down. Compared with the line drawing detection method, the method adapts to the characteristics of periodic sinusoidal variation signals of the single-phase alternating current, but the real-time voltage is compared with the corresponding value of the phase of the sine table, and the phase of the single-phase alternating current needs to be locked by a phase-locked loop of equipment. If the performance of the phase-locked loop is poor or the voltage waveform of the actual power grid is distorted, the engineering application of the method is seriously influenced. It is easy to misjudge and cannot realize quick response time.
In view of this, the present disclosure was made by the designer to further consider the problems of the single-phase ac voltage detection.
Disclosure of Invention
The invention aims to provide a single-phase alternating voltage signal power failure rapid detection algorithm, a single-phase alternating voltage signal power failure rapid detection device, a single-phase alternating voltage signal power failure rapid detection storage medium, a single-phase alternating voltage signal power failure rapid detection program product and a single-phase alternating voltage signal terminal device, so as to achieve rapid power failure detection response.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for rapidly detecting power failure of a single-phase alternating voltage signal comprises
Setting, opening up a storage space M [ i ], wherein i belongs to [1, N ]; setting a timer threshold value T _ gate and an error threshold value V _ gate; the storage space is used for storing single-phase alternating voltage sampling values, and the storage space at least stores single-phase alternating voltage values of one period;
sampling, namely sampling a real-time single-phase alternating current voltage value V _ new, searching a voltage value V _ last of a phase corresponding to a previous period in a storage space according to a current phase, and entering a cyclic sampling step if the voltage value V _ last does not exist; if the voltage value V _ last exists, entering a power failure judgment step;
a power failure judgment step, namely calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; if the error V _ delta is larger than the set error threshold value V _ gate, accumulating the timer T _ cnt, then judging whether the timer T _ cnt reaches the set timer threshold value T _ gate or not, and if so, judging that the power failure is abnormal; otherwise, entering a cyclic sampling step;
and a cyclic sampling step, storing the current sampling voltage value to a V _ new storage space M [ i ], enabling i = i +1, and if i > N, enabling i =1, and continuing the sampling step.
In the setting step, the size of the storage space M [ i ] is N, which is related to the sampling frequency and the single-phase ac signal frequency, i.e., N = F _ sam/F _ ac, where F _ sam is the sampling frequency and F _ ac is the single-phase ac signal frequency.
The sampling frequency F _ sam satisfies the following condition: f _ sam > 100F _ ac.
A single-phase alternating voltage signal power failure rapid detection device comprises an alternating signal input module, an alternating voltage sampling module, an alternating frequency measurement module, a CPU calculation module and a power failure detection result output module, wherein the alternating signal input module is connected with the alternating voltage sampling module and the alternating frequency measurement module;
the alternating current signal input module is used for inputting a single-phase alternating current signal;
the alternating voltage sampling module is used for sampling an input single-phase alternating current signal to obtain a real-time single-phase alternating voltage value V _ new, and the sampling frequency is F _ sam;
the alternating-current frequency measurement module is used for converting an input single-phase alternating-current signal into a square-wave frequency signal and acquiring the frequency F _ ac of the single-phase alternating-current signal;
the CPU calculation module is provided with a storage space M [ i ], i belongs to [1, N ], and is used for acquiring a single-phase alternating current voltage value V _ new and a single-phase alternating current signal frequency F _ ac; and searching a voltage value V _ last of a phase corresponding to the previous period in a storage space according to the current phase of the single-phase alternating voltage value V _ new, and calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; if the error V _ delta is larger than the set error threshold value V _ gate, accumulating the timer T _ cnt, then judging whether the timer T _ cnt reaches the set timer threshold value T _ gate or not, and if so, judging that the power failure is abnormal; otherwise, no power failure occurs;
and the power failure detection result output module is used for outputting power failure abnormity or no power failure when the CPU calculation module judges whether the power failure occurs.
The size of the memory space M [ i ] is N, which is related to the sampling frequency and the frequency of the single-phase ac signal, i.e., N = F _ sam/F _ ac, where F _ sam is the sampling frequency and F _ ac is the frequency of the single-phase ac signal.
The sampling frequency F _ sam satisfies the following condition: f _ sam > 100F _ ac.
A computer-readable storage medium having stored therein instructions, which when run on a terminal device, cause the terminal device to execute the power-down fast detection method as described above.
A computer software program product, which when run on a terminal device, causes the terminal device to perform the power down fast detection method as described above.
A terminal device comprises a processor and a memory,
the memory is to store instructions;
the processor is used for executing the instructions stored in the memory so as to enable the terminal equipment to execute the power failure rapid detection method.
After the scheme is adopted, the single-phase alternating current voltage sampling device opens up the storage space, samples the single-phase alternating current voltage and stores the single-phase alternating current voltage into the storage space. And for the sampling voltage value, searching the voltage value of the corresponding phase in the previous period in the memory according to the phase, and after comparing the sampling voltage value with the voltage value, judging whether the power failure occurs or not according to the frequency of continuously searching the error threshold value by the error. The invention only uses limited memory, does not need to look up sine table or calculate trigonometric function, and the cost of CPU processor is low. According to the invention, through reasonable combination of the voltage error threshold and the timer threshold, the condition of non-sinusoidal voltage waveform in the actual power grid environment can be adapted, millisecond-level power failure response can be realized in the power grid environment with power grid voltage waveform distortion and large harmonic component in an industrial park or remote areas, the standby power supply can be rapidly and seamlessly switched, and stable operation of important loads is ensured.
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FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a schematic block diagram of the present invention.
Detailed Description
As shown in fig. 1, the invention discloses a method for rapidly detecting the power failure of a single-phase alternating-current voltage signal, which comprises the following steps:
s1, opening up a storage space M [ i ], and setting a timer threshold value T _ gate and an error threshold value V _ gate. The storage space is used for storing single-phase alternating voltage sampling values, and the storage space at least stores single-phase alternating voltage values of one period.
The size of the storage space M [ i ] is N, i belongs to [1, N ], and the storage space can store N sampling values. In this embodiment, the size N of the storage space is related to the sampling frequency and the frequency of the single-phase ac signal, that is, N = F _ sam/F _ ac, where F _ sam is the sampling frequency and F _ ac is the frequency of the single-phase ac signal.
In this embodiment, a CPU processor is used for sampling (the CPU processor may be an industrial personal computer, a PC, an embedded processor, a digital signal processor, a single chip microcomputer, or the like). Therefore, the present embodiment exploits memory space within the CPU processor. In addition, the embodiment adopts single-phase alternating current of 230V and 50Hz, so that the frequency F _ ac of the alternating current is 50 Hz; and the sampling frequency is 20 KHz. Therefore, N of the storage space in the present embodiment is 400.
In addition, the present embodiment sets the timer threshold value T _ gate to 20 (equivalent to 1 msec); the error threshold V _ gate is set to 26V (equivalent to 20% of the single-phase ac voltage).
S2, start sampling, let i =1, and then proceed to step S3.
S3, sampling the real-time single-phase alternating current voltage value V _ new, finding the voltage value V _ last of the phase corresponding to the previous period stored in the storage space according to the current phase, and if the voltage value V _ last does not exist, entering the step S5; if the voltage value V _ last exists, the process proceeds to step S4.
In this embodiment, the phase of the current sampling voltage value can be determined by using conventional hardware zero-crossing phase-lock detection or software digital phase-lock, allowing for a fixed phase difference or delay. According to the scheme, the phase of the power grid does not need to be accurately obtained, complex digital phase-locking calculation is not needed, and the cost of a CPU (central processing unit) processor is low.
S4, calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; then, whether the error V _ delta is greater than the set error threshold V _ gate is determined, that is, whether V _ delta > V _ gate is true is determined, and if not, the process proceeds to step S7; if yes, accumulating the timer T _ cnt, namely T _ cnt = T _ cnt +1, then judging whether the timer T _ cnt reaches a set timer threshold value T _ gate or not, and if yes, judging that the power failure is abnormal; otherwise, the process proceeds to step S5.
When the single-phase alternating-current voltage is judged to have power failure abnormality, rapid power failure correspondence can be carried out. In this embodiment, the timer threshold T _ gate is set to 20 (equivalent to 1 millisecond), so that the power grid power failure detection time less than 2 milliseconds can be realized.
And S5, storing the current sampling voltage value to a V _ new storage space M [ i ], enabling i = i +1, and enabling i =1 if i > N, and proceeding to step S3 to continue sampling and power failure detection.
The above description is only one embodiment of the present invention, and the steps are not intended to limit the scope of the present invention. For example, in practical applications, the step 2 is not necessary, but i may start from other values because the whole storage space is circularly indexed.
As shown in fig. 2, based on the same inventive concept, the invention also discloses a single-phase alternating voltage signal power failure rapid detection device, which comprises an alternating signal input module, an alternating voltage sampling module, an alternating frequency measurement module, a CPU calculation module and a power failure detection result output module, wherein the alternating signal input module is connected with the alternating voltage sampling module and the alternating frequency measurement module, the alternating voltage sampling module and the alternating frequency measurement module are connected with the CPU calculation module, and the CPU calculation module is connected with the power failure detection result output module.
The alternating current signal input module is used for inputting a single-phase alternating current signal; the alternating-current voltage sampling module is used for sampling an input single-phase alternating-current signal to obtain a real-time single-phase alternating-current voltage value V _ new, and the sampling frequency is F _ sam, and in the embodiment, the sampling frequency F _ sam meets the following conditions: f _ sam > 100F _ ac. And the alternating-current frequency measuring module is used for converting the input single-phase alternating-current signal into a square-wave frequency signal and acquiring the frequency F _ ac of the single-phase alternating-current signal.
The CPU calculation module is provided with a storage space M [ i ], i ∈ [1, N ], in this embodiment, the size N of the storage space is related to a sampling frequency and a single-phase ac signal frequency, that is, N = F _ sam/F _ ac, where F _ sam is the sampling frequency, and F _ ac is the single-phase ac signal frequency.
The CPU calculation module is used for acquiring a single-phase alternating current voltage value V _ new and a single-phase alternating current signal frequency F _ ac; and searching a voltage value V _ last of a phase corresponding to the previous period in a storage space according to the current phase of the single-phase alternating voltage value V _ new, and calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; if the error V _ delta is larger than the set error threshold value V _ gate, accumulating the timer T _ cnt, then judging whether the timer T _ cnt reaches the set timer threshold value T _ gate or not, and if so, judging that the power failure is abnormal; otherwise, no power is lost.
And the power failure detection result output module is used for outputting power failure abnormity or no power failure when the CPU calculation module judges whether the power failure occurs.
The invention also discloses a computer readable storage medium, which stores instructions, and when the instructions are run on the terminal device, the terminal device is enabled to execute the power failure rapid detection method.
The invention also discloses a computer software program product, and when the computer software program product runs on the terminal equipment, the terminal equipment is enabled to execute the power failure rapid detection method.
The invention also discloses terminal equipment, which comprises a processor and a memory, wherein the memory is used for storing instructions; the processor is used for executing the instructions stored in the memory so as to enable the terminal equipment to execute the power failure rapid detection method.
In summary, the key point of the present invention is that the present invention only uses limited memory, does not need to look up sine table or perform trigonometric function calculation, and the cost of the CPU processor is low. According to the invention, through reasonable combination of the voltage error threshold and the timer threshold, the condition of non-sinusoidal voltage waveform in the actual power grid environment can be adapted, millisecond-level power failure response can be realized in the power grid environment with power grid voltage waveform distortion and large harmonic component in an industrial park or remote areas, the standby power supply can be rapidly and seamlessly switched, and stable operation of important loads is ensured.
The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (9)
1. A method for rapidly detecting power failure of a single-phase alternating-current voltage signal is characterized by comprising the following steps: comprises that
Setting, opening up a storage space M [ i ], wherein i belongs to [1, N ]; setting a timer threshold value T _ gate and an error threshold value V _ gate; the storage space is used for storing single-phase alternating voltage sampling values, and the storage space at least stores single-phase alternating voltage values of one period;
sampling, namely sampling a real-time single-phase alternating current voltage value V _ new, searching a voltage value V _ last of a phase corresponding to a previous period in a storage space according to a current phase, and entering a cyclic sampling step if the voltage value V _ last does not exist; if the voltage value V _ last exists, entering a power failure judgment step;
a power failure judgment step, namely calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; if the error V _ delta is larger than the set error threshold value V _ gate, accumulating the timer T _ cnt, then judging whether the timer T _ cnt reaches the set timer threshold value T _ gate or not, and if so, judging that the power failure is abnormal; otherwise, entering a cyclic sampling step;
and a cyclic sampling step, storing the current sampling voltage value to a V _ new storage space M [ i ], enabling i = i +1, and if i > N, enabling i =1, and continuing the sampling step.
2. The method for rapidly detecting the power failure of the single-phase alternating-current voltage signal according to claim 1, characterized in that: in the setting step, the size of the storage space M [ i ] is N, which is related to the sampling frequency and the single-phase ac signal frequency, i.e., N = F _ sam/F _ ac, where F _ sam is the sampling frequency and F _ ac is the single-phase ac signal frequency.
3. The method for rapidly detecting the power failure of the single-phase alternating-current voltage signal according to claim 2, characterized in that: the sampling frequency F _ sam satisfies the following condition: f _ sam > 100F _ ac.
4. The utility model provides a single phase alternating voltage signal falls electric quick detection device which characterized in that: the system comprises an alternating current signal input module, an alternating current voltage sampling module, an alternating current frequency measuring module, a CPU (central processing unit) calculating module and a power failure detection result output module, wherein the alternating current signal input module is connected with the alternating current voltage sampling module and the alternating current frequency measuring module, the alternating current voltage sampling module and the alternating current frequency measuring module are connected with the CPU calculating module, and the CPU calculating module is connected with the power failure detection result output module;
the alternating current signal input module is used for inputting a single-phase alternating current signal;
the alternating voltage sampling module is used for sampling an input single-phase alternating current signal to obtain a real-time single-phase alternating voltage value V _ new, and the sampling frequency is F _ sam;
the alternating-current frequency measurement module is used for converting an input single-phase alternating-current signal into a square-wave frequency signal and acquiring the frequency F _ ac of the single-phase alternating-current signal;
the CPU calculation module is provided with a storage space M [ i ], i belongs to [1, N ], and is used for acquiring a single-phase alternating current voltage value V _ new and a single-phase alternating current signal frequency F _ ac; and searching a voltage value V _ last of a phase corresponding to the previous period in a storage space according to the current phase of the single-phase alternating voltage value V _ new, and calculating the error between the current sampling voltage value V _ new and the voltage value V _ last of the phase corresponding to the previous period: v _ delta = | V _ new-V _ last |; if the error V _ delta is larger than the set error threshold value V _ gate, accumulating the timer T _ cnt, then judging whether the timer T _ cnt reaches the set timer threshold value T _ gate or not, and if so, judging that the power failure is abnormal; otherwise, no power failure occurs;
and the power failure detection result output module is used for outputting power failure abnormity or no power failure when the CPU calculation module judges whether the power failure occurs.
5. The device for rapidly detecting the power failure of the single-phase alternating voltage signal according to claim 4, wherein: the size of the memory space M [ i ] is N, which is related to the sampling frequency and the frequency of the single-phase ac signal, i.e., N = F _ sam/F _ ac, where F _ sam is the sampling frequency and F _ ac is the frequency of the single-phase ac signal.
6. The device for rapidly detecting the power failure of the single-phase alternating voltage signal according to claim 4, wherein: the sampling frequency F _ sam satisfies the following condition: f _ sam > 100F _ ac.
7. A computer-readable storage medium characterized by: the computer-readable storage medium has stored therein instructions that, when run on a terminal device, cause the terminal device to execute the power failure fast detection method according to claim 1 or 2.
8. A computer software program product, characterized in that: the computer software program product, when running on a terminal device, causes the terminal device to perform the power down fast detection method as claimed in claim 1 or 2.
9. A terminal device comprising a processor and a memory, characterized in that:
the memory is to store instructions;
the processor is used for executing the instructions stored in the memory to enable the terminal device to execute the power failure rapid detection method according to claim 1 or 2.
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| CN116243234B (en) * | 2023-05-11 | 2023-08-11 | 石家庄科林电气股份有限公司 | Power failure detection method and system of multimode assembled electric energy meter and electric energy meter |
| CN117907878A (en) * | 2024-03-15 | 2024-04-19 | 商宇(深圳)科技有限公司 | Method and device for judging power failure of alternating current power supply, electronic equipment and storage medium |
| CN117907878B (en) * | 2024-03-15 | 2024-06-04 | 商宇(深圳)科技有限公司 | Method and device for judging power failure of alternating current power supply, electronic equipment and storage medium |
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