CN114295887A - Power failure detection method - Google Patents
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- CN114295887A CN114295887A CN202111582091.0A CN202111582091A CN114295887A CN 114295887 A CN114295887 A CN 114295887A CN 202111582091 A CN202111582091 A CN 202111582091A CN 114295887 A CN114295887 A CN 114295887A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a power failure detection method, which comprises the following steps: step 1, setting a sampling period and setting the sampling number Ns in the sampling period Ts; step 2, sampling Ns three-phase line voltage instantaneous values in a sampling period, and calculating absolute values of the sampled three-phase line voltage instantaneous values; step 3, judging whether the three-phase line voltage is in a power-down state or not according to the absolute value of the sampled three-phase line voltage instantaneous value; step 4, judging the power failure type of the three-phase line voltage according to the number of sampling periods of continuous power failure of the three-phase line voltage, wherein the power failure type comprises the following steps: single-phase power-down and three-phase power-down. The invention utilizes the collected line voltage to deduce the running state of the power grid by comparing and calculating with the set threshold value in the set period, analyzes to obtain the specific power failure state, such as power failure of a certain phase or three phases, and sends out the power failure alarm signal and the power failure state in time, thereby being beneficial to the timely adjustment of a rear-end servo system.
Description
Technical Field
The invention relates to the field of power failure detection, in particular to a power failure detection method.
Background
With the rapid development of power electronic technology and computer control technology, an alternating current speed regulating system consisting of a servo driver and a servo motor is widely applied to a numerical control machine tool. However, the numerical control machine tool has power grid voltage fluctuation and power failure conditions in different degrees during operation, and when abnormal fluctuation or sudden power failure occurs in the power grid, the direct current bus capacitor inside the intelligent power supply module can be maintained for a period of time for the back-end servo system to continue to operate, and the maintaining time generally lasts from tens milliseconds to a hundred milliseconds.
However, if the abnormal condition of the power grid cannot be detected in time, the power grid side power failure phenomenon is judged, after the electric quantity of the direct current bus capacitor is exhausted, enough energy is not available to maintain the continuous operation of the rear-end servo system, the alarm or fault influence is generated on the whole working system, even the damage is generated on the workpiece being processed, the power grid power failure phenomenon not only can influence the normal work and stability of the equipment, but also brings the risk of damage to the workpiece being processed, and the power failure detection is carried out by using an external power grid voltage monitoring module, so that the cost is high.
Disclosure of Invention
The present invention provides a solution to overcome the above problems.
The invention comprises the following steps:
step 1, setting a sampling period and setting the sampling number Ns in the sampling period Ts; the range of the sampling period Ts and the numerical value of the sampling number Ns are set according to experience;
step 2, sampling Ns three-phase line voltage instantaneous values in a sampling period, and calculating absolute values of the sampled three-phase line voltage instantaneous values;
step 3, judging whether the three-phase line voltage is in a power-down state or not according to the absolute value of the sampled three-phase line voltage instantaneous value; if the three-phase line voltage is in a power-down state, performing the next step; if the three-phase line voltage is not in the power-down state, repeating the operations of the step 2-the step 3 for the next sampling period until the three-phase line voltage is in the power-down state;
Further, in step 2, determining whether the three-phase line voltage is in a power-down state includes:
comparing the absolute values of the sampled Ns three-phase line voltage instantaneous values, selecting an absolute value larger than other absolute values from the Ns absolute values, namely a first absolute value, comparing the first absolute value with a set threshold, and judging that the three-phase line voltage is in a power-down state if the first absolute value is smaller than the set threshold; otherwise, judging that the voltage of the three-phase line is not in a power-down state; the threshold is set empirically.
Further, step 4 comprises:
adding 1 to the power-down count x, repeating the step 2 to the step 3, if the next sampling period is not powered down, judging that the three-phase line voltage is in a single-phase power-down state, resetting the power-down count x to zero, and performing single-phase power-down alarm; if the next sampling period is still in a power-down state, repeating the steps, and when the numerical value of the power-down count x is greater than or equal to a threshold value, judging that the voltage of the three-phase line is in a three-phase power-down state, and performing three-phase power-down alarm; the power down count x is a positive integer with an initial value of 0, and the threshold value is determined empirically.
Further, when selecting the range of sampling periods, the selection is made according to the following strategy:
during a sampling period, the absolute value of one single-phase line voltage instantaneous value is continuously larger than the absolute values of the other two single-phase line voltage instantaneous values.
Further, when the three-phase line voltage is in a single-phase power-down state, the single-phase line voltage of the power-down is judged according to the absolute value of the instantaneous value of each single-phase line voltage:
in a sampling period in which the three-phase line voltage is in power failure, respectively taking the maximum absolute value of the absolute values of the instantaneous values of each single-phase line voltage as a first fault value, a second fault value and a third fault value;
and taking the fault value smaller than the other two fault values in the first fault value, the second fault value and the third fault value as a final fault value, and judging that the single-phase line voltage to which the final fault value belongs is in a power-down state.
The invention utilizes the collected line voltage to deduce the running state of the power grid by comparing and calculating with the set threshold value in the set period, analyzes to obtain the specific power failure state, such as power failure of a certain phase or three phases, and sends out the power failure alarm signal and the power failure state in time, thereby being beneficial to the timely adjustment of a rear-end servo system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a prior art circuit diagram;
FIG. 3 is a three-phase power grid voltage waveform of the present invention;
FIG. 4 is a three-phase power grid voltage waveform after data processing according to the present invention;
FIG. 5 is a graph of a single-phase voltage power-down waveform simulated by the present invention;
fig. 6 is a simulated three-phase voltage power-down waveform of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention comprises the steps of:
step 1, setting a fixed sampling period and setting the sampling number Ns in the sampling period Ts; the range of the sampling period Ts and the numerical value of the sampling number Ns are set according to experience;
step 2, sampling Ns three-phase line voltage instantaneous values in a sampling period, and calculating absolute values of the sampled three-phase line voltage instantaneous values;
specifically, the controller performs absolute value processing on the collected power grid voltage signals, namely, only positive value comparison is performed in the next operation, and corresponding data are stored in the data register. Fig. 3 shows the voltage waveform of a normal three-phase power grid line, the frequency of the three-phase voltage is 50Hz, and the effective value is 380V. As can be seen from fig. 3, the three-phase line voltage has 3 peaks in a 20ms period, i.e. it can be considered that a voltage peak occurs in 6.67 ms. If the absolute value of the instantaneous value of the voltage of the three-phase line is calculated, that is, the waveform of the line voltage in the negative half cycle is inverted, the waveform with the amplitude below 0 is inverted, and in the same cycle, the three-phase line voltage can be found to have 6 wave peaks, that is, one voltage wave peak can be found within 3.33ms, as shown in fig. 4, so that a faster judgment basis is provided for the following operation and detection.
And (5) starting to interrupt the period, and starting to sample the voltage data of the power grid in real time by the controller. And setting a fixed sampling period Ts and a detection starting flag bit T0 as a periodic detection grid voltage state flag.
And setting the number Ns of the sampled grid line voltage values within the sampling period Ts, generally selecting the number Ns to be 1800 according to empirical values, and setting the counting sampling period Ts/Ns at the moment.
Step 3, judging whether the three-phase line voltage is in a power-down state or not according to the absolute value of the sampled three-phase line voltage instantaneous value; if the three-phase line voltage is in a power-down state, performing the next step; if the three-phase line voltage is not in the power-down state, repeating the operations of the step 2-the step 3 for the next sampling period until the three-phase line voltage is in the power-down state;
Specifically, three values of the power grid line voltages Uab, Ubc and Uca stored in the data register in the sampling period Ts are compared, the maximum value is selected and stored in the comparison register CM _ sd1, and a data operation basis is provided for the next threshold judgment.
The threshold setting parameter P1508 of the determination condition is selected. For a 380V AC voltage, when the allowable fluctuation range of + -15% is considered, the minimum value for the voltage peak value is:
V＝380*1.414*85％＝456V(1)
after data processing, the three-phase waveform period of the line voltage of the power grid is equivalent to 10ms, and the assumption is that
Uab＝Emsin(ωt) (2)
Let Uab be Uca, when wt is between 0-pi, and line voltage Uab and Uca intersect, then
Through calculation, wt is 0.939, Em takes the value 456, and at this time, the line voltage Uab is Uca 369V.
So when the grid voltage meets ± 15% fluctuation, the parameter P1508 may be set to 369 at this time.
And comparing the data in the comparison register CM _ sd1 in the comparator module with a threshold parameter P1508, and if the data in the comparison register CM _ sd1 is smaller than the parameter P1508, indicating that the power grid line voltage is abnormally powered down in the sampling period Ts, and continuing to process through an accumulator in the next step. If the data in the comparison register CM _ sd1 is greater than the parameter P1508, it indicates that the abnormal power failure of the power grid line voltage does not exist in the sampling period Ts, and a sampling period Ts +1 is prepared for continuous detection.
Preferably, in step 2, determining whether the three-phase line voltage is in a power-down state includes: comparing the absolute values of the sampled Ns three-phase line voltage instantaneous values, selecting an absolute value larger than other absolute values from the Ns absolute values, namely a first absolute value, comparing the first absolute value with a set threshold, and judging that the three-phase line voltage is in a power-down state if the first absolute value is smaller than the set threshold; otherwise, judging that the voltage of the three-phase line is not in a power-down state; the threshold is set empirically.
Preferably, step 4 comprises:
adding 1 to the power-down count x, repeating the step 2 to the step 3, if the next sampling period is not powered down, judging that the three-phase line voltage is in a single-phase power-down state, resetting the power-down count x to zero, and performing single-phase power-down alarm; if the next sampling period is still in a power-down state, repeating the steps, and when the numerical value of the power-down count x is greater than or equal to a threshold value, judging that the voltage of the three-phase line is in a three-phase power-down state, and performing three-phase power-down alarm; the power down count x is a positive integer with an initial value of 0, and the threshold value is determined empirically.
Preferably, when selecting the range of sampling periods, the selection is made according to the following strategy:
during a sampling period, the absolute value of one single-phase line voltage instantaneous value is continuously greater than the absolute values of the other two single-phase line voltage instantaneous values.
Preferably, when the three-phase line voltage is in a single-phase power-down state, the single-phase line voltage of the power-down is judged according to the absolute value of the instantaneous value of each single-phase line voltage:
in a sampling period in which the three-phase line voltage is in power failure, respectively taking the maximum absolute value of the absolute values of the instantaneous values of each single-phase line voltage as a first fault value, a second fault value and a third fault value;
and taking the fault value smaller than the other two fault values in the first fault value, the second fault value and the third fault value as a final fault value, and judging that the single-phase line voltage to which the final fault value belongs is in a power-down state.
Specifically, the line voltage waveforms simulating single phase power down and three phase power down are shown in fig. 5 and 6. When a power grid power failure alarm signal is detected in a sampling period Ts through threshold judgment, if the line voltage phase sequence of the alarm signal is Uab, the power grid power failure alarm zone bit corresponding to the phase sequence Uab starts to be added with 1, and meanwhile, the total power grid power failure alarm zone bit also starts to be added with 1. And when the power grid power failure alarm signal is continuously detected in the next sampling period Ts +1, continuously adding 1 to the corresponding phase sequence power grid power failure alarm zone bit and the total power grid power failure alarm zone bit. And if the power grid power failure alarm signal is not detected in the next sampling period Ts +1, clearing the total power grid power failure alarm zone bit. When the value of the total power grid power failure alarm flag bit is greater than the power grid state flag parameter P1602, which is usually set to 5, the power grid power failure state is judged to be three-phase power failure at the moment, and then three-phase power failure alarm is immediately output. When the value of the total power grid power failure alarm zone bit is smaller than the power grid state zone parameter P1602, the power grid power failure state at this time is judged to be single-phase power failure, at this time, the power grid power failure alarm zone bit corresponding to the phase sequence needs to be further judged, if the value of the Uab power grid power failure alarm zone bit is 1, the power grid C phase power failure at this time is judged, and C phase power failure alarm is output.
In the circuit diagram shown in fig. 2, R1 to R4 in fig. 2 are sampling resistors, and their resistance values are selected to be related to the grid voltage amplitude. U1 and U2 are differential isolation operational amplifiers, and transmit the voltage signal on the sampling resistor to the controller in the form of differential signals. The U1 and U2 adopt TI AMC1200 chips, the offset error is low, the noise is low, the precision is 0.5 percent, and the gain is fixed to be 8. The controller integrates an ADC (analog-to-digital converter), adopts a TMS320F28377 DSP chip of TI and a 32-bit CPU (central processing unit), and processes the acquired voltage signals of the power grid line based on the method.
Has the advantages that:
1) the invention monitors the voltage of the power grid in real time by utilizing the acquired line voltage, deduces the running condition of the power grid by comparing and calculating with a set threshold value in a set period, analyzes to obtain a specific power failure state, such as a certain phase power failure or a three-phase power failure, and timely sends out a power failure alarm signal and the power failure state, thereby being beneficial to timely adjustment of a rear-end servo system.
2) The invention realizes the function of rapid power failure detection through an algorithm based on a hardware system of the invention, thereby not only reducing the cost of the whole system, but also being more rapid and flexible in the function of realizing the power failure detection of the power grid.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A power failure detection method is characterized by comprising the following steps:
step 1, setting a sampling period and setting the sampling number Ns in the sampling period Ts; the range of the sampling period Ts and the numerical value of the sampling number Ns are set according to experience;
step 2, sampling Ns three-phase line voltage instantaneous values in a sampling period, and calculating absolute values of the sampled three-phase line voltage instantaneous values;
step 3, judging whether the three-phase line voltage is in a power-down state or not according to the absolute value of the sampled three-phase line voltage instantaneous value; if the three-phase line voltage is in a power-down state, performing the next step; if the three-phase line voltage is not in the power-down state, repeating the operations of the step 2-the step 3 for the next sampling period until the three-phase line voltage is in the power-down state;
step 4, judging the power failure type of the three-phase line voltage according to the number of sampling periods of continuous power failure of the three-phase line voltage, wherein the power failure type comprises the following steps: single-phase power-down and three-phase power-down.
2. The power failure detection method according to claim 1, wherein in the step 2, determining whether the three-phase line voltage is in a power failure state comprises:
comparing the absolute values of the sampled Ns three-phase line voltage instantaneous values, selecting an absolute value larger than other absolute values from the Ns absolute values, namely a first absolute value, comparing the first absolute value with a set threshold, and judging that the three-phase line voltage is in a power-down state if the first absolute value is smaller than the set threshold; otherwise, judging that the voltage of the three-phase line is not in a power-down state; the threshold is set empirically.
3. The power failure detection method according to claim 1, wherein the step 4 comprises:
adding 1 to the power-down count x, repeating the step 2 to the step 3, if the next sampling period is not powered down, judging that the three-phase line voltage is in a single-phase power-down state, resetting the power-down count x to zero, and performing single-phase power-down alarm; if the next sampling period is still in a power-down state, repeating the steps, and when the numerical value of the power-down count x is greater than or equal to a threshold value, judging that the voltage of the three-phase line is in a three-phase power-down state, and performing three-phase power-down alarm; the power down count x is a positive integer with an initial value of 0, and the threshold value is determined empirically.
4. The power failure detection method according to claim 1, wherein when the range of the sampling period is selected, the selection is performed according to the following strategy:
during a sampling period, the absolute value of one single-phase line voltage instantaneous value is continuously larger than the absolute values of the other two single-phase line voltage instantaneous values.
5. The power-down detection method according to claim 3, wherein when the three-phase line voltage is in a single-phase power-down state, the single-phase line voltage in power-down is judged according to the absolute value of the instantaneous value of each single-phase line voltage:
in a sampling period in which the three-phase line voltage is in power failure, respectively taking the maximum absolute value of the absolute values of the instantaneous values of each single-phase line voltage as a first fault value, a second fault value and a third fault value;
and taking the fault value smaller than the other two fault values in the first fault value, the second fault value and the third fault value as a final fault value, and judging that the single-phase line voltage to which the final fault value belongs is in a power-down state.
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