CN108134400B - Treatment method and device for three-phase unbalance - Google Patents
Treatment method and device for three-phase unbalance Download PDFInfo
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Abstract
The invention provides a method and a device for treating three-phase unbalance, which belong to the field of electric power treatment and comprise the following steps: acquiring signal parameters of three-phase unbalanced current; calculating a three-phase unbalance value according to the signal parameters, and comparing the three-phase unbalance value with a preset three-phase unbalance threshold value; and if the comparison result shows that the three-phase unbalanced current is unqualified, judging the unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator, and treating the three-phase unbalanced current according to the determined use mode. The unqualified three-phase unbalanced current interval is judged, the use modes of the control switch, the capacitor combination and the power electronic generator are determined according to the judgment result, and the control switch and the capacitor combination with low cost effect are introduced into the use modes, so that the treatment cost of the three-phase unbalanced current is reduced.
Description
Technical Field
The invention belongs to the field of power management, and particularly relates to a method and a device for managing three-phase unbalance.
Background
The low-voltage power grid mostly adopts a three-phase four-wire system wiring mode, and the distribution transformer can be in a three-phase unbalanced operation state for a long time due to the reasons of unbalance of single-phase loads, asynchronism of power utilization and the like.
The problem of three-phase imbalance treatment in the prior art is mainly realized based on an electric power electron generator, and although the electric power electron generator has the characteristic of high adjustment precision, the practical use of the three-phase imbalance compensation device is restricted by the disadvantage of high cost.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides a treatment method and a treatment device which are based on the introduction of a control switch and a capacitor combination with low cost effect in a use mode and further reduce the treatment cost when treating three-phase unbalanced current.
In order to achieve the technical purpose, the invention provides a treatment method for three-phase unbalance, which comprises the following steps:
step one, collecting signal parameters of three-phase unbalanced current of a distribution transformer;
step two, calculating a three-phase unbalance value corresponding to the signal parameter according to the acquired signal parameter, and comparing the calculated three-phase unbalance value with a preset three-phase unbalance threshold value;
step three, if the comparison result shows that the three-phase unbalanced current is unqualified, judging an unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control mode stored in the controllable unit list based on the determined use mode;
and step four, starting the control unit according to the updated control mode in the controllable unit list to treat the three-phase unbalanced current.
Optionally, the second step includes:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
Optionally, the step three includes:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of the interphase capacitor, judging that the unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
Optionally, the third step further includes:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
In another aspect, the present invention provides an abatement apparatus for three-phase imbalance, the abatement apparatus comprising:
the acquisition unit is used for acquiring signal parameters of three-phase unbalanced current of the distribution transformer;
the comparison unit is used for calculating a three-phase unbalance value corresponding to the signal parameter according to the acquired signal parameter and comparing the calculated three-phase unbalance value with a preset three-phase unbalance threshold value;
the judging unit is used for judging the unbalanced current interval of the three-phase unbalanced current if the comparison result shows that the three-phase unbalanced current is unqualified, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control modes stored in the controllable unit list based on the determined use modes;
and the control unit is used for starting the control unit to control the three-phase unbalanced current according to the updated control mode in the controllable unit list.
Optionally, the comparison unit is configured to:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
Optionally, the determining unit includes:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of an interphase capacitor, judging that the three-phase unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
Optionally, the determining unit is further configured to:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
Optionally, the power electronic generator includes a power electronic generator, and the control switch and capacitor combination includes a control capacitor.
The technical scheme provided by the invention has the beneficial effects that:
the unqualified three-phase unbalanced current interval is judged, the use modes of the control switch, the capacitor combination and the power electronic generator are determined according to the judgment result, and the control switch and the capacitor combination with low cost effect are introduced into the use modes, so that the treatment cost of the three-phase unbalanced current is reduced.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a treatment method for three-phase unbalance provided by the invention;
fig. 2 is a schematic structural diagram of the treatment device for three-phase unbalance provided by the invention.
Detailed Description
To make the structure and advantages of the present invention clearer, the structure of the present invention will be further described with reference to the accompanying drawings.
Example one
The invention provides a treatment method for three-phase unbalance, which comprises the following steps of:
step one, collecting signal parameters of three-phase unbalanced current of a distribution transformer;
step two, calculating a three-phase unbalance value corresponding to the signal parameter according to the acquired signal parameter, and comparing the calculated three-phase unbalance value with a preset three-phase unbalance threshold value;
step three, if the comparison result shows that the three-phase unbalanced current is unqualified, judging an unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control mode stored in the controllable unit list based on the determined use mode;
and step four, starting the control unit according to the updated control mode in the controllable unit list to treat the three-phase unbalanced current.
In the implementation, because the treatment cost of the three-phase unbalanced current is high at present, in order to reduce the treatment cost of the three-phase unbalanced current, firstly, signal parameters of the three-phase unbalanced current of the distribution transformer are collected;
then, calculating the acquired signal parameters according to an unbalance formula to calculate a three-phase unbalance value, wherein the three-phase unbalance value calculation formula is (maximum current in three-phase unbalance current-minimum current in three-phase unbalance current) ÷ maximum current in three-phase unbalance current multiplied by 100%, a preset three-phase unbalance threshold value is determined according to the specific condition of the distribution transformer, the preset three-phase unbalance threshold value of the embodiment is set to be 15%, the calculated three-phase unbalance value is compared with the preset three-phase unbalance threshold value, and whether the three-phase unbalance current is qualified or not is judged according to the comparison result;
secondly, if the comparison result shows that the three-phase unbalanced current is unqualified, further judging an unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control modes stored in the controllable unit list based on the determined use modes of the control switch, the capacitor combination and the power electronic generator to obtain an updated control mode;
and finally, starting a control unit corresponding to the control mode based on the updated control mode to treat the three-phase unbalanced current.
Based on the treatment method, the unbalanced current interval of the three-phase unbalanced current is further judged by judging that the three-phase unbalanced current is unqualified, the use modes of the control switch, the capacitor combination and the power electronic generator are determined according to the judgment result, the control switch and the capacitor combination with low cost effect are introduced into the use modes, the control modes stored in the controllable unit list are updated based on the use modes of the control switch and the capacitor combination with low cost effect, and the three-phase unbalanced current is treated according to the updated control mode, so that the treatment cost of the three-phase unbalanced current is reduced.
Optionally, the second step includes:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
In implementation, the three phases are respectively an a phase, a B phase and a C phase, the unbalanced three-phase current value indicates that the a phase current value, the B phase current value and the C phase current value are not equal to each other, the a phase current value is 8A, the B phase current value is 8.2A, the C phase current value is 9A, and the preset three-phase unbalance threshold is 15%, for example, the unbalanced three-phase current unbalance is calculated to be about 11% according to the unbalance formula, the calculated unbalanced three-phase current unbalance is compared with the preset three-phase unbalance threshold, and the calculated unbalanced three-phase current unbalance is determined to be smaller than the preset three-phase unbalance threshold according to the comparison result, so that the unbalanced three-phase current is determined to be qualified, and the unbalanced three-phase current does not need to be.
Taking the example that the current value of the phase A is 8A, the current value of the phase B is 10A, the current value of the phase C is 13A, and the preset threshold value of the unbalance degree of the three phases is 15%, calculating the unbalance degree of the three-phase current to be 50% according to the unbalance degree formula, comparing the calculated unbalance degree of the three-phase current with the preset threshold value of the unbalance degree of the three phases, and determining that the calculated unbalance degree of the three-phase current is greater than the preset threshold value of the unbalance degree of the three-phase current according to the comparison result, so that the three-phase unbalance current is determined to.
Optionally, the step three includes:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of an interphase capacitor, judging that the three-phase unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
In the implementation, capacitors are installed between any two phases of the three phases, and the capacitance value of each capacitor is equal, and the capacitance value of the capacitor is also called as the capacitance value of the interphase capacitor. Taking the current value of the A phase as 8A, the current value of the B phase as 10A, the current value of the C phase as 13A and the capacitance value of the interphase capacitor as 13Kvar as examples, the current value of the A, B phase as 2A, the current value of the B, C phase as 3A, the current value of the A, C phase as 5A, the maximum value of the interphase current value as compared with the capacitance value of the interphase capacitor, more specifically, the maximum value of the interphase current value as compared with the capacitance value of the interphase capacitor, and the maximum value of the interphase current value greater than one third of the capacitance value according to the comparison result, then the three-phase unbalanced current is determined to be in a large current interval, the usage of the power generator, the control switch and the capacitor combination is determined, and the usage of the power generator and the control switch with low cost effect are determined according to the usage of the power generator and, The use mode of the capacitor combination updates the control mode stored in the controllable unit list, and the control unit corresponding to the control mode is started based on the updated control mode to treat the three-phase unbalanced current, so that the treatment cost of the three-phase unbalanced current is reduced.
Optionally, the third step further includes:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
In the implementation, taking an a-phase current value of 7A, a B-phase current value of 10A, a C-phase current value of 9A, and an interphase capacitor capacity value of 13Kvar as an example, an A, B-phase interphase current value is 3A, a B, C-phase interphase current value is 1A, a A, C-phase interphase current value is 2A, the maximum value of the interphase current values is determined to be 3A, the maximum value of the interphase current values is compared with the interphase capacitor capacity value, and the maximum value of the interphase current values is determined to be smaller than the interphase capacitor capacity value according to the comparison result, so that the three-phase unbalanced current is determined to be in a small current interval. Determining the number of times of use of the power electronic generator to be 1 time and the number of times of use of the combination of the control switch and the capacitor to be 5 times based on the consideration of the use cost, and further determining the ratio of the number of times of use of the combination of the power electronic generator, the control switch and the capacitor to be 1/5, wherein the preset use threshold value is 1/5, and if the ratio of the number of times of use is smaller than the preset use threshold value, the use mode of the power electronic generator is determined; on the contrary, if the ratio of the number of times of use is not less than the preset use threshold, the use mode of the combination of the control switch and the capacitor is determined, the control mode in the controllable unit list is updated based on the determined use mode, and the three-phase unbalanced current is treated according to the updated control mode.
The invention provides a treatment method for three-phase unbalance, which comprises the following steps: acquiring signal parameters of three-phase unbalanced current; calculating a three-phase unbalance value according to the signal parameters, and comparing the three-phase unbalance value with a preset three-phase unbalance threshold value; and if the comparison result shows that the three-phase unbalanced current is unqualified, judging the unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator, and treating the three-phase unbalanced current according to the determined use mode. The unqualified three-phase unbalanced current interval is judged, the use modes of the control switch, the capacitor combination and the power electronic generator are determined according to the judgment result, and the control switch and the capacitor combination with low cost effect are introduced into the use modes, so that the treatment cost of the three-phase unbalanced current is reduced.
Example two
This embodiment proposes a abatement device for three-phase imbalance, as shown in fig. 2, the abatement device comprising:
the acquisition unit 11 is used for acquiring signal parameters of three-phase unbalanced current of the distribution transformer;
the comparison unit 12 is configured to calculate a three-phase imbalance value corresponding to the signal parameter according to the acquired signal parameter, and compare the calculated three-phase imbalance value with a preset three-phase imbalance threshold value;
the judging unit 13 is used for judging an unbalanced current interval of the three-phase unbalanced current if the comparison result shows that the three-phase unbalanced current is unqualified, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control modes stored in the controllable unit list based on the determined use modes;
and the treatment unit 14 is used for starting the control unit to treat the three-phase unbalanced current according to the updated control mode in the controllable unit list.
In the implementation, because the current device for treating the three-phase unbalanced current has the problem of high cost, in order to reduce the cost of the device for treating the three-phase unbalanced current, the following units are used for treatment in the implementation:
firstly, acquiring signal parameters of three-phase unbalanced current of a distribution transformer through an acquisition unit 11, and transmitting the acquired signal parameters to a comparison unit 12;
then, the comparison unit 12 calculates the acquired signal parameters, and calculates a three-phase unbalance value according to an unbalance formula, wherein the three-phase unbalance value calculation formula is (maximum current in three-phase unbalance current-minimum current in three-phase unbalance current) ÷ maximum current in three-phase unbalance current × 100%, a preset three-phase unbalance threshold value is determined according to the specific condition of the distribution transformer, the preset three-phase unbalance threshold value of the embodiment is set to be 15%, the calculated three-phase unbalance value is compared with the preset three-phase unbalance threshold value, and whether the three-phase unbalance current is qualified or not is determined according to the comparison result;
secondly, if the comparison result shows that the three-phase unbalanced current is unqualified, judging an unbalanced current interval of the three-phase unbalanced current through a judging unit 13, determining the use modes of a control switch, a capacitor combination and a power electronic generator according to the judgment result, and updating the control modes stored in a controllable unit list based on the determined use modes of the control switch, the capacitor combination and the power electronic generator to obtain an updated control mode;
and finally, starting a control unit corresponding to the control mode according to the updated control mode through the treatment unit 14 to treat the three-phase unbalanced current.
In addition, the core controller is composed of the above-mentioned comparison unit 12, judgment unit 13, and abatement unit 14.
Based on the treatment device, the comparison unit 12 is used for judging that the three-phase unbalanced current is unqualified, the judgment unit 13 is used for judging the unbalanced current interval of the unqualified three-phase unbalanced current, the use modes of the control switch, the capacitor combination and the power electronic generator are determined according to the judgment result, the control switch and the capacitor combination with low cost effect are introduced into the use modes, the control modes stored in the controllable unit list are updated based on the use modes of the control switch and the capacitor combination with low cost effect, and the treatment unit 14 is used for treating the three-phase unbalanced current according to the updated control mode, so that the treatment cost of the three-phase unbalanced current is reduced.
Optionally, the comparison unit 12 is configured to:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
In implementation, the three phases are an a phase, a B phase, and a C phase, where the unbalanced three-phase current value indicates that the a phase current value, the B phase current value, and the C phase current value are not equal to each other, and taking the a phase current value as 8A, the B phase current value as 8.2A, the C phase current value as 9A, and the preset three-phase imbalance threshold value as 15% as an example, the comparison unit 12 calculates the three-phase current imbalance degree according to the imbalance degree formula to be about 11%, compares the calculated three-phase current imbalance degree with the preset three-phase imbalance threshold value, and determines that the calculated three-phase current imbalance degree is smaller than the preset three-phase imbalance degree threshold value according to the comparison result, so that the three-phase unbalanced current is determined to be qualified, and the three-phase.
Taking the a-phase current value as 8A, the B-phase current value as 10A, the C-phase current value as 13A, and the preset three-phase unbalance threshold value as 15%, the comparison unit 12 calculates the three-phase current unbalance as 50% according to the unbalance formula, compares the calculated three-phase current unbalance with the preset three-phase unbalance threshold value, and determines that the calculated three-phase current unbalance is greater than the preset three-phase unbalance threshold value according to the comparison result, so as to determine that the three-phase unbalance current is not qualified.
Optionally, the determining unit 13 includes:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of an interphase capacitor, judging that the three-phase unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
In the implementation, capacitors are installed between any two phases of the three phases, and the capacitance value of each capacitor is equal, and the capacitance value of the capacitor is also called as the capacitance value of the interphase capacitor. Taking the current value of the phase a as 8A, the current value of the phase B as 10A, the current value of the phase C as 13A, and the capacitance value of the inter-phase capacitor as 13Kvar as an example, the determining unit 13 determines that the inter-phase current value of the phase A, B is 2A, the inter-phase current value of the phase B, C is 3A, the inter-phase current value of the phase A, C as 5A, determines that the maximum value of the inter-phase current values is 5A, compares the maximum value of the inter-phase current values with the capacitance value of the inter-phase capacitor, more specifically, compares the maximum value of the inter-phase current values with the capacitance value of the inter-phase capacitor, determines that the maximum value of the inter-phase current values is greater than one third of the capacitance value of the inter-phase capacitor according to the comparison result, determines that the three-phase unbalanced current. The control mode stored in the controllable unit list is updated according to the use mode of the power electronic generator and the use mode of the combination of the control switch and the capacitor with low cost effect, the control unit corresponding to the control mode is started according to the updated control mode to treat the three-phase unbalanced current, and then the treatment cost of the three-phase unbalanced current is reduced.
Optionally, the judging unit 13 is further configured to:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
In the implementation, taking the current value of the a phase as 7A, the current value of the B phase as 10A, the current value of the C phase as 9A, and the capacitance value of the inter-phase capacitor as 13Kvar as an example, the determining unit 13 determines that the inter-phase current value of A, B phases is 3A, the inter-phase current value of B, C phases is 1A, and the inter-phase current value of A, C phases is 2A according to the calculation, determines that the maximum value of the inter-phase current values is 3A, compares the maximum value of the inter-phase current values with the capacitance values of the inter-phase capacitors, determines that the maximum value of the inter-phase current values is smaller than the capacitance values of the inter-phase capacitors according to the comparison result, determines that the three-phase unbalanced current is in a small current interval, and when the three-phase unbalanced current is in. Determining the number of times of use of the power electronic generator to be 1 and the number of times of use of the combination of the control switch and the capacitor to be 5 based on the consideration of the use cost, and further determining the ratio of the number of times of use of the combination of the control switch and the capacitor of the power electronic generator to be 1/5, wherein the preset use threshold value is 1/5, and if the ratio of the number of times of use is smaller than the preset use threshold value, determining the use mode of the power electronic generator; and otherwise, if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor. The control modes in the controllable unit list are updated based on the determined use modes, the three-phase unbalanced current is treated based on the updated control modes, and the treatment cost of the three-phase unbalanced current is reduced because the use times of the use modes of the combination of the control switch and the capacitor are more than that of the active control module.
The present invention provides a device for treating three-phase unbalance, comprising: the acquisition unit is used for acquiring signal parameters of three-phase unbalanced current; the comparison unit is used for calculating a three-phase unbalance value according to the signal parameters and comparing the three-phase unbalance value with a preset three-phase unbalance threshold value; and the judging unit is used for judging the unbalanced current interval of the three-phase unbalanced current if the comparison result shows that the three-phase unbalanced current is unqualified, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and introducing the control switch and the capacitor combination with low cost effect into the use modes, so that the treatment cost of the three-phase unbalanced current is reduced.
The sequence numbers in the above embodiments are merely for description, and do not represent the sequence of the assembly or the use of the components.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The treatment method for the three-phase unbalance is characterized by comprising the following steps:
step one, collecting signal parameters of three-phase unbalanced current of a distribution transformer;
step two, calculating a three-phase unbalance value corresponding to the signal parameter according to the acquired signal parameter, and comparing the calculated three-phase unbalance value with a preset three-phase unbalance threshold value;
step three, if the comparison result shows that the three-phase unbalanced current is unqualified, judging an unbalanced current interval of the three-phase unbalanced current, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control mode stored in the controllable unit list based on the determined use mode;
step four, starting the control unit to treat the three-phase unbalanced current according to the updated control mode in the controllable unit list;
the determining of the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result comprises the following steps:
if the ratio of the number of times of use is smaller than a preset use threshold, determining the use mode of the power electronic generator; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
2. The governing method for the three-phase unbalance according to claim 1, wherein the second step includes:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
3. A treatment method for three-phase unbalance according to claim 1, wherein the third step comprises:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of the interphase capacitor, judging that the unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
4. A treatment method for three-phase unbalance according to claim 3, wherein the third step further comprises:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
5. An abatement device for three-phase imbalance, the abatement device comprising:
the acquisition unit is used for acquiring signal parameters of three-phase unbalanced current of the distribution transformer;
the comparison unit is used for calculating a three-phase unbalance value corresponding to the signal parameter according to the acquired signal parameter and comparing the calculated three-phase unbalance value with a preset three-phase unbalance threshold value;
the judging unit is used for judging the unbalanced current interval of the three-phase unbalanced current if the comparison result shows that the three-phase unbalanced current is unqualified, determining the use modes of the control switch, the capacitor combination and the power electronic generator according to the judgment result, and updating the control modes stored in the controllable unit list based on the determined use modes;
the control unit is used for controlling the three-phase unbalanced current according to the control mode updated in the controllable unit list;
the judging unit is further configured to:
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
6. The governance device for three-phase imbalance according to claim 5, wherein the comparison unit is configured to:
if the three-phase unbalance value is smaller than the preset three-phase unbalance threshold value, the three-phase unbalance current is judged to be qualified, the three-phase unbalance current does not need to be treated, or
And if the three-phase unbalance value is larger than the preset three-phase unbalance threshold value, judging that the three-phase unbalance current is unqualified.
7. The governance device for three-phase imbalance according to claim 5, wherein the judging unit includes:
if the comparison result judges that the three-phase unbalanced current is unqualified, acquiring the phase current value of the three-phase unbalanced current;
if the maximum value of the interphase current value is larger than one third of the capacitance value of an interphase capacitor, judging that the three-phase unbalanced current is in a large current interval, and determining the use mode of the combination of the power electronic generator, the control switch and the capacitor;
the capacitance value of the interphase capacitor is the capacitance value of any interphase capacitor arranged in three phases.
8. The governance device for three-phase imbalance according to claim 7, wherein the determination unit is further configured to:
if the maximum value of the interphase current value is less than one third of the capacitance value of the interphase capacitor, judging that the three-phase unbalanced current is in a small current interval;
determining the using time ratio of the combination of the power electronic generator, the control switch and the capacitor based on the using cost, and determining the using mode of the power electronic generator if the using time ratio is smaller than a preset using threshold; or
And if the ratio of the using times is not less than the preset using threshold, determining the using mode of the combination of the control switch and the capacitor.
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| CN115189373B (en) * | 2022-06-22 | 2023-07-21 | 国网安徽省电力有限公司 | Method and device for determining generation reason of three-phase imbalance |
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| CN102340144A (en) * | 2011-09-21 | 2012-02-01 | 苏州汉风科技发展有限公司 | Dynamic reactive power compensation device |
| CN202856378U (en) * | 2012-06-20 | 2013-04-03 | 金陵科技学院 | Three-phase unbalance load compensation device |
| CN102856920B (en) * | 2012-09-20 | 2015-06-10 | 金陵科技学院 | Three-phase unbalanced load compensation device and method |
| CN103501013A (en) * | 2013-10-21 | 2014-01-08 | 安徽天沃电气技术有限公司 | Three-phase unbalanced load power factor correction and system current balance equipment |
| CN204886200U (en) * | 2015-07-08 | 2015-12-16 | 国家电网公司 | Distribution transformer unbalanced three phase current detection compensation arrangement |
| CN205610228U (en) * | 2016-05-19 | 2016-09-28 | 山东电工电气集团新能科技有限公司 | Alternate electric capacity unbalanced three phase and idle improvement device |
| CN205811552U (en) * | 2016-07-14 | 2016-12-14 | 黄伟昊 | The regulation of a kind of three-phase imbalance and the Intelligent capacitor new construction of reactive-load compensation |
| CN106099958B (en) * | 2016-07-21 | 2018-06-15 | 国网江西省电力有限公司电力科学研究院 | A kind of distribute-electricity transformer district three-phase imbalance control measures preferred method |
| CN106169768A (en) * | 2016-08-02 | 2016-11-30 | 江苏卓特电气科技有限公司 | Three-phase load unbalance self-checking device |
| CN107086591A (en) * | 2017-04-25 | 2017-08-22 | 武汉大学 | A kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation |
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