CN114994567A - Dry-type hollow parallel reactor turn-to-turn short circuit fault online detection method - Google Patents
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Abstract
The invention relates to an on-line detection method for turn-to-turn short circuit fault of a dry-type air-core parallel reactor, which obtains the three-phase voltage V of the dry-type air-core parallel reactor a ，V b ，V c And three-phase current I a ，I b ，I c (ii) a Respectively calculating voltage phase angle according to three-phase voltage and three-phase current
And phase angle of current
According to the phase angle of the voltage
And phase angle of current
Calculating U by combining values of three-phase voltage and three-phase current d And U q 、I d And I q (ii) a According to U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor; calculating the active power P, the reactive power Q, the capacity S and the initial value active power P 0 Reactive power Q 0 Volume S 0 The Euclidean distance D; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D. The invention achieves the following beneficial effects: the sensitivity and the reliability of the system are improved, and the stable operation of the reactor is guaranteed.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a dry-type air-core parallel reactor turn-to-turn short circuit fault online detection method.
Background
The reactor is an indispensable power device of a power system, is widely applied to reactive compensation devices, limits switching inrush current or fault current of a capacitor bank, compensates inductive reactive current of the system and the like, and is one of important power devices of the power system. Compared with an oil immersed reactor, the dry type air core reactor has the advantages of uniform initial voltage distribution, good linearity, small loss, low noise, convenient installation, simple maintenance and the like, thereby being widely applied. Because the dry-type air-core reactor is usually arranged outdoors, the operation environment is severe, turn-to-turn insulation damage is easy to occur in the long-term operation process of the dry-type air-core reactor, turn-to-turn short circuit is formed, a short-circuit turn can be formed in the reactor due to the turn-to-turn short circuit, the internal current of the short-circuit turn is rapidly increased under the action of electromagnetic induction, the temperature near the short-circuit turn is rapidly increased, the dry-type air-core reactor is damaged, and the power supply reliability of a power system is seriously influenced.
In the initial stage of turn-to-turn short circuit fault of the dry-type hollow parallel reactor, although the short-circuit loop current is large, the phase current change of the reactor is small and can not reach the action threshold value of 1.5-2 times of rated current required by overcurrent protection, the overcurrent protection of the existing detection system can not be started in time, the equivalent inductance, the resistance, the magnetic field and other electric quantity change is not obvious, the sensitivity and the reliability are low, and the purpose of monitoring the turn-to-turn short circuit of the dry-type hollow parallel reactor is difficult to achieve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an on-line detection method for turn-to-turn short circuit faults of a dry type hollow parallel reactor.
The purpose of the invention is realized by the following technical scheme:
the first aspect of the embodiments of the present specification provides an on-line detection method for turn-to-turn short circuit fault of a dry-type air-core parallel reactor, including:
obtaining the three-phase voltage V of the dry-type hollow parallel reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
Respectively calculating the voltage phase angle according to the three-phase voltage and the three-phase current
And phase angle of current
According to said voltage phase angle
And phase angle of current
Combining said three-phase voltages and said three-phase currents, U d And U q 、I d And I q ；
According to the U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
calculating the active power P, the reactive power Q, the capacity S and the initial value active power P 0 Reactive power Q 0 Volume S 0 The Euclidean distance D; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D.
Preferably, the three-phase voltage V of the dry type hollow shunt reactor is obtained a ，V b ，V c And three-phase current I a ，I b ，I c The method is characterized in that: obtaining three-phase voltage V in real time through voltage transformer and current transformer a ，V b ，V c And three-phase current I a ，I b ，I c 。
Preferably, the voltage phase angle is calculated according to the three-phase voltage and the three-phase current respectively
And phase angle of current
Calculating the voltage phase angle of the system by combining the three-phase voltage signal and the current signal through the phase-locked loop technology
Phase angle of current
Preferably, said passing of said voltage phase angle
And phase angle of current
Calculating U by combining the three-phase voltage and the three-phase current d And U q 、I d And I q The method comprises the following steps:
respectively and sequentially carrying out Clark conversion and Park conversion on the three-phase voltage and the three-phase current of the reactor, and then calculating U under a dq rotation coordinate system according to the matrix d 、U q 、I d And I q 。
Preferably, the d-axis in the dq coordinate system represents a direct axis, the q-axis represents a quadrature axis, and the U represents a linear axis d And U q Respectively representing the direct-axis voltage component and the quadrature-axis voltage component of the three-phase voltage, said I d And I q Respectively representing direct-axis current components and quadrature-axis current components of the three-phase currents.
Preferably, said passing through said U d And U q 、I d And I q And calculating the active power P, the reactive power Q and the capacity S of the reactor, wherein the method comprises the following steps: when the reactor works normally, the U obtained according to calculation d 、U q 、I d And I q Calculating the initial active power P of the reactor 0 Reactive power Q 0 Volume S 0 (ii) a The initial active power P 0 And reactive power Q 0 Capacity S 0 As a reference value.
Preferably, said passing through said U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor, and further comprising: u for real-time detection calculation d 、U q 、I d And I q Calculating real-time active power P, reactive power Q and capacity S;
acquiring a plurality of active power P, reactive power Q and capacity S which are calculated in real time; calculating the active power P, the reactive power Q and the capacity S which are calculated in real time and the initial active power P of the reactor 0 And reactive power Q 0 Volume S 0 Euclidean distance D between reference values.
Preferably, a threshold value of the euclidean distance D is set, and the calculated euclidean distance D is compared with the threshold value; if the Euclidean distance D is larger than the threshold value, the inter-turn short circuit of the reactor is judged, and if the Euclidean distance D is smaller than the threshold value, the inter-turn short circuit fault of the reactor is judged not to occur.
A second aspect of the embodiments of the present specification provides an on-line detection system for turn-to-turn short circuit fault of a dry-type air-core parallel reactor, including:
an acquisition module for acquiring the three-phase voltage V of the dry-type hollow shunt reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
A calculation module for calculating the voltage phase angle according to the three-phase voltage and the three-phase current
And phase angle of current
According to said voltage phase angle
And phase angle of current
Calculating U by combining the three-phase voltage and the three-phase current d And U q 、I d And I q (ii) a According to the U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
the Euclidean distance setting module is used for setting a threshold value of the Euclidean distance D;
the turn-to-turn short circuit judging module is used for comparing the calculated Euclidean distance D with the threshold value; if the Euclidean distance D is larger than the threshold value, the inter-turn short circuit of the reactor is judged, and if the Euclidean distance D is smaller than the threshold value, the inter-turn short circuit fault of the reactor is judged not to occur.
The third aspect of the embodiments of the present specification further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above-mentioned dry-type air-core shunt reactor turn-to-turn short circuit online detection method.
The beneficial effects of the embodiment of the specification are as follows:
based on the scheme, the three-phase voltage and the three-phase current of the reactor are obtained; calculating the voltage phase angle
And phase angle of current
According to said voltage phase angle
And phase angle of current
Calculating U under dq rotation coordinate system by combining the three-phase voltage and the three-phase current d 、U q 、I d And I q (ii) a According to the U d 、U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor; and calculating the active power P, the reactive power Q, the capacity S and the initial active power P 0 And reactive power Q 0 Volume S 0 The Euclidean distance D between the two; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D. The sensitivity and the reliability of the system are improved, and the stable operation of the reactor is guaranteed.
Drawings
FIG. 1 is a schematic view of the detection method of the present invention;
FIG. 2 is a schematic view of the detection system of the present invention;
FIG. 3 is an abc three-phase stationary coordinate system, an α β two-phase orthogonal stationary coordinate system, and a dq two-phase synchronous rotating coordinate system;
in the figure: 201-obtaining module, 202-calculating module, 203-Euclidean distance setting module and 204-turn-to-turn short circuit judging module.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the embodiments of the present specification are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present specification are detailed descriptions of the technical solutions of the embodiments of the present specification, and are not limitations of the technical solutions of the present specification, and the technical features of the embodiments and embodiments of the present specification may be combined with each other without conflict.
As shown in fig. 1, an on-line detection method for turn-to-turn short circuit fault of a dry-type air-core shunt reactor includes:
s101: obtaining three-phase voltage V of dry type hollow parallel reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
S102: respectively calculating voltage phase angle according to three-phase voltage and three-phase current
And phase angle of current
S103: according to the phase angle of the voltage
And phase angle of current
Calculating U by combining values of three-phase voltage and three-phase current d And U q 、I d And I q ；
S104: according to U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
s105: calculating the active power P, the reactive power Q, the capacity S and the initial value active power P 0 Reactive power Q 0 Capacity S 0 The Euclidean distance D; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D.
Specifically, step S101 acquires three-phase voltage V of dry-type air-core shunt reactor a ，V b ，V c And three-phase current I a ，I b ，I c The method mainly comprises the steps that three-phase voltage and three-phase current are obtained through a voltage transformer and a current transformer, and the three-phase voltage and the three-phase current are obtained in real time through the voltage transformer and the current transformer; the voltage transformer and the current transformer belong to a part of an acquisition module in the detection system.
Step S102 of calculating voltage phase angles according to three-phase voltages and three-phase currents respectively
And phase angle of current
Specifically, the voltage phase angle is calculated according to the three-phase voltage and the three-phase current respectively
And phase angle of current
Calculating the voltage phase angle of the system by combining the three-phase voltage signal and the current signal through the phase-locked loop technology
Phase angle of current
Inputting the three-phase voltage and the three-phase current into a phase discriminator in a phase-locked loop, and obtaining a voltage phase angle at a certain moment after the three-phase voltage and the three-phase current are converted by a loop filter and a voltage-controlled oscillator
Phase angle of current
S103: according to the phase angle of the voltage
And phase angle of current
Calculating U by combining values of three-phase voltage and three-phase current d And U q 、I d And I q ；
Specifically, through voltage phase angle
And phase angle of current
Calculating U by combining the values of three-phase voltage and three-phase current d And U q 、I d And I q The method comprises the following steps:
respectively and sequentially performing Clark conversion and Park conversion on three-phase voltage and three-phase current of the reactor, and calculating voltage (current) values under different coordinate systems; in the abc three-phase stationary coordinate system, the three-phase voltage (current) instantaneous values are respectively as follows: v a ,V b ,V c (I a ，I b ，I c ) By X a ,X b ,X c Instead.
Under the condition of equal power conversion, Clark conversion is carried out to obtain the voltage (current) X under a two-phase orthogonal static coordinate system alpha beta α ,X β Voltage (electricity) in relation to three-phase stationary coordinate systemFlow) X a ,X b ,X c Satisfies the formula (1):
further, the current X under the two-phase synchronous rotating coordinate system dq can be obtained by carrying out Park conversion d ，X q Voltage (current) X in a stationary frame α β orthogonal to two phases α ,X β Satisfies the formula (2):
in formula (2)
Is the voltage (current) phase angle.
Thus, the voltage (current) X under the two-phase synchronous rotating coordinate system dq d ,X q Voltage (current) X under three-phase static coordinate system a ,X b ,X c The conversion relationship between the two is as follows:
as shown in FIG. 3, U is calculated from dq rotation coordinate system in combination with the matrix d 、U q 、I d And I q . Wherein the d-axis in the coordinate system represents a direct axis, the q-axis represents a quadrature axis,
represents a phase angle, U d And U q Respectively representing the direct-axis and quadrature-axis voltage components of the three-phase voltage, I d And I q Respectively representing direct-axis current components and quadrature-axis current components of the three-phase currents.
S104: according to U d And U q 、I d And I q Calculating the active power of the reactorP, reactive power Q and capacity S;
in particular, by U d And U q 、I d And I q And calculating the active power P, the reactive power Q and the capacity S of the reactor, wherein the method comprises the following steps: when the reactor works normally, the U obtained according to the calculation d 、U q 、I d And I q Calculating initial active power P of reactor 0 And reactive power Q 0 Capacity S 0 . The specific calculation mode is as follows:
P＝(U d I d +U q I q )
Q＝(U q Id－UdI q )(4)
calculating the active power P, the reactive power Q and the capacity S of the reactor through the formula (4), and further comprising the following steps: u for real-time detection calculation d 、U q 、I d And I q Calculating real-time active power P, reactive power Q and capacity S;
s105: calculating active power P, reactive power Q, capacity S and initial active power P 0 Reactive power Q 0 Capacity S 0 The Euclidean distance D between the two; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D.
Specifically, acquiring a plurality of real-time calculated active power P, reactive power Q and capacity S; calculating a plurality of real-time calculated active power P, reactive power Q and capacity S and initial active power P of the reactor 0 Reactive power Q 0 Capacity S 0 The euclidean distance D therebetween. Specifically, by formula (5):
calculating a Euclidean distance D, wherein i represents a group of data in a plurality of real-time data, P i In representing multiple sets of active power dataOf the ith active power, Q i Representing the ith reactive power, S, in a plurality of sets of reactive power data i Representing the ith capacity in the plurality of sets of capacity data; subtracting a reference value from the active power, the reactive power and the capacity of the obtained i group data to the N group data, calculating the sum of the square root and the mean root to obtain a Euclidean distance D, and comparing the calculated Euclidean distance D with a set threshold value of the Euclidean distance D; and if the Euclidean distance D is larger than the threshold value, judging that the turn-to-turn short circuit of the reactor occurs, and if the Euclidean distance D is smaller than the threshold value, judging that the turn-to-turn short circuit fault does not occur in the reactor.
Based on the same inventive concept, the embodiment of the invention also provides an on-line detection system for turn-to-turn short circuit fault of the dry-type air-core parallel reactor, as shown in fig. 2: the method comprises the following steps:
an obtaining module 201 for obtaining the three-phase voltage V of the dry-type air-core shunt reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
A calculating module 202 for calculating voltage phase angles according to the three-phase voltages and the three-phase currents respectively
And phase angle of current
According to the phase angle of the voltage
And phase angle of current
Calculating U by combining values of three-phase voltage and three-phase current d And U q 、I d And I q (ii) a According to U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
a euclidean distance setting module 203 for setting a threshold of the euclidean distance D;
the turn-to-turn short circuit judging module 204 is used for comparing the calculated Euclidean distance D with a threshold value; and if the Euclidean distance D is greater than the threshold value, judging that the turn-to-turn short circuit of the reactor occurs, and if the Euclidean distance D is less than the threshold value, judging that the turn-to-turn short circuit fault does not occur in the reactor.
Based on the same inventive concept, the embodiment of the invention also provides a computer-readable storage medium, on which a computer program is stored, and the program is executed by a processor to realize the steps of the dry-type air-core shunt reactor turn-to-turn short circuit online detection method.
Based on the scheme, the three-phase voltage and the three-phase current of the reactor are obtained; calculating the voltage phase angle
And phase angle of current
According to said voltage phase angle
And phase angle of current
Calculating U by combining the three-phase voltage and the three-phase current d 、U q 、I d And I q (ii) a According to the U d 、U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor; and calculating the active power P, the reactive power Q, the capacity S and the initial active power P 0 Reactive power Q 0 Capacity S 0 The Euclidean distance D; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D. The sensitivity and the reliability of the system are improved, and the stable operation of the reactor is guaranteed.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An on-line detection method for turn-to-turn short circuit faults of a dry-type hollow shunt reactor comprises the following steps:
obtaining the three-phase voltage V of the dry-type hollow parallel reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
Respectively calculating the voltage phase angle according to the three-phase voltage and the three-phase current
And phase angle of current
According to said voltage phase angle
And phase angle of current
Calculating U by combining the three-phase voltage and the three-phase current d And U q 、I d And I q ；
According to the U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
calculating the active power P, the reactive power Q, the capacity S and the initial value active power P 0 Reactive power Q 0 Volume S 0 The Euclidean distance D; and judging the turn-to-turn short circuit state of the reactor according to the Euclidean distance D.
2. The on-line detection method according to claim 1, wherein the three-phase voltage V of the dry-type air-core shunt reactor is obtained a ，V b ，V c And three-phase current I a ，I b ，I c The method is characterized in that: obtaining three-phase voltage V in real time through voltage transformer and current transformer a ，V b ，V c And three-phase current I a ，I b ，I c 。
3. The on-line detection method as claimed in claim 1, wherein said voltage phase angle is calculated according to said three-phase voltage and said three-phase current respectively
And phase angle of current
The method comprises the following steps: calculating the voltage phase angle of the system by combining the three-phase voltage signal and the current signal through the phase-locked loop technology
Phase angle of current
4. The on-line detection method according to claim 3, characterized in that: said passing of said voltage phase angle
And phase angle of current
Calculating U by combining the three-phase voltage and the three-phase current d And U q 、I d And I q The method comprises the following steps:
three-phase power of the reactorAfter Clark conversion and Park conversion are respectively carried out on the voltage and the three-phase current in sequence, U under dq rotation coordinate system is calculated according to the matrix d 、U q 、I d And I q 。
5. The online detection method according to claim 4, characterized in that: d-axis in the dq coordinate system represents a direct axis, q-axis represents a quadrature axis, and U d And U q Respectively representing the direct-axis voltage component and the quadrature-axis voltage component of the three-phase voltage, said I d And I q Respectively representing direct-axis current components and quadrature-axis current components of the three-phase currents.
6. The on-line detection method of claim 1, said passing through said U d And U q 、I d And I q And calculating the active power P, the reactive power Q and the capacity S of the reactor, wherein the method comprises the following steps: when the reactor works normally, the U obtained according to calculation d 、U q 、I d And I q Calculating the initial active power P of the reactor 0 Reactive power Q 0 Capacity S 0 (ii) a The initial active power P 0 Reactive power Q 0 Capacity S 0 As a reference value.
7. The on-line detection method of claim 6, said passing through said U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor, and further comprising: u for real-time detection calculation d 、U q 、I d And I q Calculating real-time active power P, reactive power Q and capacity S;
obtaining a plurality of real-time calculated active power P, reactive power Q and capacity S; calculating the active power P, the reactive power Q and the capacity S which are calculated in real time and the initial active power P of the reactor 0 Reactive power Q 0 Capacity S 0 Euclidean distance D between reference values.
8. The on-line detection method according to claim 7, wherein a threshold value of the euclidean distance D is set, and the calculated euclidean distance D is compared with the threshold value; if the Euclidean distance D is larger than the threshold value, the inter-turn short circuit of the reactor is judged, and if the Euclidean distance D is smaller than the threshold value, the inter-turn short circuit fault of the reactor is judged not to occur.
9. An on-line detection system for turn-to-turn short circuit fault of a dry-type air-core shunt reactor is characterized by comprising the following components:
an acquisition module for acquiring the three-phase voltage V of the dry-type hollow shunt reactor a ，V b ，V c And three-phase current I a ，I b ，I c ；
A calculation module for calculating the voltage phase angle according to the three-phase voltage and the three-phase current
And phase angle of current
According to said voltage phase angle
And phase angle of current
Calculating U under dq rotation coordinate system by combining the three-phase voltage and the three-phase current d And U q 、I d And I q (ii) a According to the U d And U q 、I d And I q Calculating the active power P, the reactive power Q and the capacity S of the reactor;
the Euclidean distance setting module is used for setting a threshold value of the Euclidean distance D;
the turn-to-turn short circuit judging module is used for comparing the calculated Euclidean distance D with the threshold value; if the Euclidean distance D is larger than the threshold value, the inter-turn short circuit of the reactor is judged, and if the Euclidean distance D is smaller than the threshold value, the inter-turn short circuit fault of the reactor is judged not to occur.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 8.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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