CN112114196B - Current harmonic wave statistics and warning method and system - Google Patents
Current harmonic wave statistics and warning method and system Download PDFInfo
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Abstract
The invention relates to the technical field of power electronic devices, and provides a current harmonic statistic and alarm method,the method comprises the following steps: collecting current waveform for the power distribution network transmission line in the statistical period T, and calculating n times and below harmonic current I of each phase line in the current power distribution network transmission line h (ii) a Calculating the Total Harmonic Distortion (THD) of the current in the current period T i (ii) a For the total harmonic distortion rate THD of the current in the current period T i Judging according to a preset alarm rule and sending an alarm; and when the preset alarm rule is not met, the alarm operation is not executed. The invention also provides a current harmonic statistic and alarm system. According to the method, the current harmonic statistic function is realized by calculating the total harmonic distortion of each phase of current and each sub-harmonic current of each phase of the power transmission line of the power distribution network, and the alarm is realized according to the preset alarm rule, so that maintenance personnel can be informed to overhaul and maintain the power distribution network in time, and the power distribution reliability is effectively improved.
Description
Technical Field
The invention relates to the technical field of power electronic devices, in particular to a current harmonic statistic and alarm method and system.
Background
With the development of power grid technology, power electronic equipment is widely applied to various fields, and great convenience is brought to the life of people. In the field of power distribution networks, with the development of frequency conversion technology, higher harmonic current and harmonic voltage generated by frequency conversion equipment cause increasingly serious harmonic pollution to power grids.
At present, devices such as a harmonic suppressor and a harmonic absorber applied to the field of power distribution networks exist, for example, a harmonic current absorber provided by CN101552471A (published: 2009-10-07) is used for filtering harmonic current signals so as to reduce harmonic pollution. However, only the harmonic suppressor, the harmonic absorber and other devices are used in a matched manner, whether harmonic pollution harm still exists in the harmonic size of the current power distribution network cannot be judged, and the power distribution reliability cannot be guaranteed.
Disclosure of Invention
The invention provides a current harmonic statistic and alarm method and a current harmonic statistic and alarm system for overcoming the defects that whether harmonic pollution harm exists in a power distribution network or not and the reliability of power distribution cannot be ensured in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a current harmonic statistic and alarm method comprises the following steps:
s1: setting a statistical period T, collecting current waveforms of the power transmission line of the power distribution network in the statistical period T, and calculating N times of harmonic currents I of the lines of the phases A, B, C and N and the harmonic currents I below the lines in the power transmission line of the power distribution network h ；
S2: according to the n-th harmonic current I of each phase line h Calculating the Total Harmonic Distortion (THD) of the current in the current period T i ；
S3: THD for total harmonic distortion of current in current period T i Judging according to a preset alarm rule and sending an alarm; and when the preset alarm rule is not met, the alarm operation is not executed.
Preferably, in step S1, the harmonic current I is calculated h The method comprises the following specific steps:
taking the average value of the m harmonic current measurement values at even intervals in every T/20 time as the h harmonic current value I in the current statistical period T h The calculation formula is as follows:
wherein m is more than or equal to 6 and less than or equal to n.
Preferably, in the step S2, the total harmonic distortion THD of the current in the current period T is calculated i The method comprises the following specific steps:
s2.1: calculating the total harmonic current content I in the statistical period T H (ii) a The calculation formula is as follows:
s2.2: according to the total harmonic current content I H Calculating the Total Harmonic Distortion (THD) of the current i (ii) a The calculation formula is as follows:
wherein, I 1 Representing the fundamental current of the transmission line of the distribution network.
Preferably, the statistical period T is set to 1 minute.
Preferably, the harmonic order n is set to 19.
Preferably, in the step S3, the preset alarm rule includes:
(1) And (4) harmonic high hazard warning: when a certain phase current total harmonic distortion rate THD i If the duration time is greater than or equal to a preset first alarm threshold and exceeds a preset time threshold, a harmonic high-hazard alarm is sent out, and the Total Harmonic Distortion (THD) of the phase current is reported i Fundamental current and 2-nth harmonic current;
(2) Harmonic high hazard disappearance warning: when a phase line is in a harmonic high-hazard warning state, the Total Harmonic Distortion (THD) of the current does not occur for 2 minutes i If the harmonic wave high harm disappearance alarm is larger than or equal to a preset first alarm threshold value, sending the phase harmonic wave high harm disappearance alarm;
(3) And (3) harm alarm in harmonic waves: when a phase current total harmonic distortion rate THD i If the duration time is greater than or equal to a preset second alarm threshold and exceeds a preset time threshold, a harmonic damage alarm is sent out, and the Total Harmonic Distortion (THD) of the phase current is reported i Fundamental current and 2-nth harmonic current; wherein the second alarm threshold is less than the first alarm threshold;
(4) And (3) warning of disappearance of harm in harmonic waves: when a phase line is in a harmonic damage alarm state, the Total Harmonic Distortion (THD) of the current does not occur for 2 minutes i And if the harmonic wave is greater than or equal to a preset second alarm threshold value, sending out a hazard disappearance alarm in the phase harmonic wave.
Preferably, in the step S4, the set first alarm threshold is 15% to 20%, the set second alarm threshold is 5% to 10%, and the set time threshold is 5 to 10 minutes.
Preferably, the step S1 further includes the steps of: and calculating the current value of each phase line in the current power distribution network power transmission line according to the acquired current waveform, and respectively executing the steps S2-S3 to the corresponding line when the current of one-phase or multi-phase line reaches 20% of the rated current.
The invention also provides a current harmonic statistic and alarm system, which is applied to the current harmonic statistic and alarm method provided by any technical scheme and specifically comprises a data acquisition module, a microprocessor, an alarm module and a background server, wherein the output end of the data acquisition module is connected with the input end of the microprocessor, the output end of the microprocessor is connected with the input end of the alarm module, and the alarm module is in communication connection with the background server; wherein: the data acquisition module is connected with the power distribution network power transmission line and is used for acquiring current waveforms of phase circuits A, B, C and N in the power distribution network power transmission line; the microprocessor is used for calculating harmonic current and current total harmonic distortion according to a preset statistical period T and logically judging whether to send a working signal to the alarm module or not according to a preset alarm rule; the alarm module comprises a communication chip and is used for transmitting data to the background server according to the received working signal and sending an alarm to the background server; and the background server is used for receiving and displaying the data set alarm signal of the alarm module.
Preferably, the system further comprises a storage module, wherein the storage module is connected with the background server; the storage module is used for storing the alarm received from the alarm module and corresponding harmonic current and current total harmonic distortion rate data.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: according to the invention, the current harmonic statistic function is realized by calculating the total harmonic distortion of each phase current for 19 times and below of each phase circuit of A, B, C and N in the power transmission line of the power distribution network and the total harmonic distortion of each phase current, and the alarm is realized according to the preset alarm rule, so that maintenance personnel can be informed to overhaul and maintain the power distribution network in time, and the power distribution reliability is effectively improved.
Drawings
FIG. 1 is a flow chart of a current harmonic statistic and alarm method of embodiment 1;
fig. 2 is a schematic structural diagram of the current harmonic statistics and alarm system of embodiment 2.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The present embodiment provides a current harmonic statistics and alarm method, as shown in fig. 1, which is a flowchart of the current harmonic statistics and alarm method of the present embodiment.
In the current harmonic statistic and alarm method provided in this embodiment, the method specifically includes the following steps:
s1: setting a statistical period T, collecting current waveforms of the power transmission line of the power distribution network in the statistical period T, and calculating N times of harmonic currents I of the lines of the phases A, B, C and N and the harmonic currents I below the lines in the power transmission line of the power distribution network h . In the present embodiment, the statistical period T is set to 1 minute, and the number of harmonics n to be calculated is set to 19.
In this step, the harmonic current I is calculated h The method comprises the following specific steps:
taking the average value of m harmonic current measurement values at even intervals every 3 seconds as the h harmonic current value I within the current statistical period T =1 minute h The calculation formula is as follows:
in this embodiment, m is taken as 6 times.
In addition, in the present embodiment, the execution conditions are set as follows: and calculating the current value of each phase line in the current power distribution network power transmission line according to the acquired current waveform, and respectively executing the following steps S2-S3 on the corresponding line when the current of one-phase or multi-phase line reaches 20% of the rated current.
S2: according to the n-th harmonic current I of each phase line h Calculating the Total Harmonic Distortion (THD) of the current in the current period T i (ii) a The method comprises the following specific steps:
s2.1: calculating the total harmonic current content I in the statistical period T H (ii) a The calculation formula is as follows:
s2.2: according to the total harmonic current content I H Calculating the Total Harmonic Distortion (THD) i (ii) a The calculation formula is as follows:
wherein, I 1 And the fundamental current of the power transmission line of the power distribution network is represented and calculated through the acquired current waveform.
S3: for the total harmonic distortion rate THD of the current in the current period T i Judging according to a preset alarm rule and sending an alarm; and when the preset alarm rule is not met, the alarm operation is not executed.
In this embodiment, the preset alarm rule is as follows:
(1) And (4) harmonic high hazard warning: when a phase current total harmonic distortion rate THD i If the current is greater than or equal to a preset first alarm threshold and the duration time exceeds a preset time threshold, a harmonic high-hazard alarm is sent out, and the Total Harmonic Distortion (THD) of the phase current is reported i Fundamental current and 2-19 subharmonic current; in the embodiment, the first alarm threshold is set to 15%, and the time threshold is set to 5 minutes;
(2) Harmonic high hazard disappearance warning: when a phase line is in a harmonic high-hazard warning state, the Total Harmonic Distortion (THD) of the current does not occur for 2 minutes i If the harmonic wave is more than or equal to 15 percent, sending a high harm disappearance alarm of the phase harmonic wave;
(3) And (3) harm alarm in harmonic waves: when a certain phase current total harmonic distortion rate THD i If the current is greater than or equal to a preset second alarm threshold and the duration time exceeds a preset time threshold, sending out a hazard alarm in harmonic waves and reporting the Total Harmonic Distortion (THD) of the phase current i Fundamental current and 2-19 subharmonic current; in the embodiment, the second alarm threshold is set to 5%, and the time threshold is set to 5 minutes;
(4) And (3) warning of disappearance of harm in harmonic waves: when a phase line is in a harmonic damage alarm state, the Total Harmonic Distortion (THD) of the current does not occur for 2 minutes i And if the harmonic wave is more than or equal to 5 percent, sending a hazard disappearance alarm in the phase harmonic wave.
When a phase current total harmonic distortion rate THD i <And 5%, indicating that the phase line is in a low-hazard state at present, and not needing to send an alarm and not executing alarm operation.
In the embodiment, the current harmonic statistic function is realized by calculating the 19 times and the lower times of harmonic currents of the A, B, C and N phase lines in the power transmission line of the power distribution network and the total harmonic distortion of the current of each phase, and the alarm is realized according to the preset alarm rule, so that maintenance personnel can be informed to overhaul and maintain the power distribution network in time, and the power distribution reliability is effectively improved.
Example 2
The present embodiment provides a current harmonic statistics and alarm system, which is applied to the current harmonic statistics and alarm method provided in embodiment 1. Fig. 2 is a schematic structural diagram of the current harmonic statistics and alarm system of the present embodiment.
In the current harmonic statistics and warning system provided by this embodiment, it specifically includes data acquisition module 1, microprocessor 2, warning module 3 and backend server 4, and the output of data acquisition module 1 is connected with the input of microprocessor 2, and the output of microprocessor 2 is connected with the input of warning module 3, and warning module 3 and backend server 4 communication connection.
The data acquisition module 1 is connected with a power distribution network power transmission line and is used for acquiring current waveforms of lines A, B, C and N in the power distribution network power transmission line; the microprocessor 2 is used for calculating harmonic current and current total harmonic distortion rate of the acquired current waveform according to a preset statistical period T, and logically judging whether to send a working signal to the alarm module 3 according to a preset alarm rule; the alarm module 3 comprises a communication chip 31, and the alarm module 3 is used for transmitting data to the background server 4 according to the received working signal to realize the alarm to the background server 4; the background server 4 is used for receiving the data set alarm signal of the alarm module 3 and displaying the data set alarm signal.
Furthermore, the current harmonic statistics and alarm system in the embodiment further includes a storage module 5, and the storage module 5 is connected with the background server 4; the storage module 5 is used for storing the alarm received from the alarm module 3 and corresponding harmonic current and current total harmonic distortion rate data. Distribution network maintainer accessible backend server 4 transfers historical alarm data from storage module 5, the development of the work of being convenient for overhaul.
In the specific implementation process, the data acquisition module 1 acquires current waveforms of the power distribution network transmission line according to a preset statistical period and then transmits the current waveforms to the microprocessor 2, and the microprocessor 2 calculates the harmonic current I of 19 times and below of each phase line A, B, C and N in the current power distribution network transmission line according to the received current waveforms h And fundamental current I 1 Judging whether the current of one-phase or multi-phase line reaches 20% of rated current, if yes, calculating the total harmonic distortion rate THD of current of each phase line respectively i Judging and giving an alarm according to a preset alarm rule; and when the preset alarm rule is not met, the alarm operation is not executed. Specifically, when the total harmonic distortion rate THD of the current of a phase line is higher than that of the current of a phase line i When the alarm rule is met, the microprocessor 2 sends a working signal to the alarm module 3, the alarm module 3 transmits the received working signal to the background server 4, and the transmitted data comprise the alarm state of the current phase line and the Total Harmonic Distortion (THD) of the phase current i Fundamental current and 2-19 subharmonic current, and the background server 4 is matched with a display to display the received data. Distribution network maintenance personnelThe power transmission line can be overhauled and maintained in time according to the alarm data displayed by the background server 4, so that the power distribution reliability is improved.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A current harmonic statistic and alarm method is characterized by comprising the following steps:
s1: setting a statistical period T, collecting current waveforms of the power transmission line of the power distribution network in the statistical period T, and calculating N times of harmonic currents I of the lines of the phases A, B, C and N and the harmonic currents I below the lines in the power transmission line of the power distribution network h ；
S2: according to the n-th harmonic current I of each phase line h Calculating the Total Harmonic Distortion (THD) of the current in the current period T i ；
S3: for the total harmonic distortion rate THD of the current in the current period T i Judging according to a preset alarm rule and sending an alarm; when the preset alarm rule is not met, the alarm operation is not executed; the preset alarm rule comprises the following steps:
(1) And (4) harmonic high hazard warning: when a certain phase current total harmonic distortion rate THD i If the current is greater than or equal to a preset first alarm threshold and the duration time exceeds a preset time threshold, a harmonic high-hazard alarm is sent out, and the Total Harmonic Distortion (THD) of the phase current is reported i Fundamental current and 2-nth harmonic current;
(2) Harmonic high hazard disappearance warning: when a phase line is in a harmonic high-hazard warning state, the Total Harmonic Distortion (THD) of the current does not occur for 2 minutes i If the harmonic wave high harm disappearance alarm is larger than or equal to a preset first alarm threshold value, sending the phase harmonic wave high harm disappearance alarm;
(3) And (4) hazard warning in harmonic waves: when a certain phase current total harmonic distortion rate THD i If the current is greater than or equal to a preset second alarm threshold and the duration time exceeds a preset time threshold, sending out a hazard alarm in harmonic waves and reporting the Total Harmonic Distortion (THD) of the phase current i Fundamental current and 2-nth harmonic current; wherein the second alarm threshold is less than the first alarm threshold;
(4) And (3) warning of disappearance of harm in harmonic waves: when a phase line is in a harmfulness alarm state in harmonic waves, the Total Harmonic Distortion (THD) of current does not occur for 2 minutes i If the harmonic wave is larger than or equal to a preset second alarm threshold value, sending a hazard disappearance alarm in the phase harmonic wave;
wherein the set first alarm threshold value is 15-20%, the set second alarm threshold value is 5-10%, and the set time threshold value is 5-10 minutes.
2. The current harmonic statistics and alarm method of claim 1, wherein: in the step S1, the harmonic current I is calculated h The method comprises the following specific steps:
in the current statistical period T, taking the average value of m times of harmonic current measured values at even intervals in every T/20 time as the h-th harmonic current value I h The calculation formula is as follows:
wherein m is more than or equal to 6 and less than or equal to n.
3. The current harmonic statistics and alarm method of claim 2, wherein: in the step S2, the total harmonic distortion rate THD of the current in the current period T is calculated i The method comprises the following specific steps:
s2.1: calculating the total harmonic current content I in the statistical period T H (ii) a The calculation formula is as follows:
s2.2: according to the total harmonic current content I H Calculating the Total Harmonic Distortion (THD) i (ii) a The calculation formula is as follows:
wherein, I 1 And the fundamental current of the power transmission line of the power distribution network is represented.
4. The current harmonic statistics and alarm method of claim 2, wherein: the statistical period T is set to 1 minute.
5. The current harmonic statistics and alarm method of claim 2, wherein: the harmonic order n is set to 19.
6. The current harmonic statistics and warning method according to any one of claims 1 to 5, characterized in that: in the step S1, the method further includes the steps of: and calculating the current value of each phase line in the current power distribution network power transmission line according to the acquired current waveform, and respectively executing the steps S2-S3 to the corresponding line when the current of one-phase or multi-phase line reaches 20% of the rated current.
7. A current harmonic statistic and alarm system is applied to the current harmonic statistic and alarm method according to any one of claims 1 to 6, and is characterized by comprising a data acquisition module, a microprocessor, an alarm module and a background server, wherein the output end of the data acquisition module is connected with the input end of the microprocessor, the output end of the microprocessor is connected with the input end of the alarm module, and the alarm module is in communication connection with the background server; wherein:
the data acquisition module is connected with the power distribution network power transmission line and is used for acquiring current waveforms of phase circuits A, B, C and N in the power distribution network power transmission line;
the microprocessor is used for calculating harmonic current and current total harmonic distortion rate of the acquired current waveform according to a preset statistical period T and logically judging whether to send a working signal to the alarm module according to a preset alarm rule;
the alarm module comprises a communication chip and is used for transmitting data to the background server according to the received working signal and sending an alarm to the background server;
and the background server is used for receiving and displaying the data set alarm signal of the alarm module.
8. The current harmonic statistics and alarm system of claim 7, wherein: the system also comprises a storage module, wherein the storage module is connected with the background server; the storage module is used for storing the alarm received from the alarm module and corresponding harmonic current and current total harmonic distortion rate data.
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| CN114113774B (en) * | 2021-11-19 | 2023-12-19 | 国网辽宁省电力有限公司鞍山供电公司 | State analysis method of distribution transformer based on zero line current data |
| CN114172187A (en) * | 2021-12-24 | 2022-03-11 | 广东电网有限责任公司 | Monitoring method and device for high-voltage direct-current transmission system |
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