CN115993532B - Short-circuit current-rising characteristic test method and device for generator - Google Patents
Short-circuit current-rising characteristic test method and device for generator Download PDFInfo
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Abstract
The invention discloses a method and a device for testing short-circuit current rising characteristics of a generator, wherein the method comprises the following steps: controlling the stator current of each phase of the generator to rise; calculating a three-phase current balance quality coefficient according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition; calculating the temperature qualification coefficient of the stator winding according to the temperature value obtained when the stator current of the stator winding meets a third preset condition; controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the qualification coefficient of the short circuit characteristic according to a plurality of stator current values and a plurality of rotor current values; and determining whether the generator has short circuit faults or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient. The method improves the accuracy, reliability and standardization of the short-circuit current rising characteristic test.
Description
Technical Field
The invention relates to the technical field of generators, in particular to a method and a device for testing short-circuit current rising characteristics of a generator.
Background
In the performance test of the generator, the short-circuit current rising characteristic test is a critical test and determines the running stability and reliability of the generator.
The short-circuit current rise characteristic test means that A, B, C three phases included in the generator are in a steady-state short circuit, and when the generator operates at a rated rotating speed, the rotor current is gradually increased, and whether a relation curve of the rotor current and the stator current of the generator is correct or not is checked. The test can be used for checking the correctness of the rising and falling performance control of the stator current of the generator, detecting the correctness of the wiring of the current transformer in the stator loop and checking whether short circuit faults exist in the stator winding and the rotor winding of the generator.
However, the current step of testing the short-circuit current-rising characteristic of the generator has no standardized flow and lacks standardization. Meanwhile, the short-circuit current rising characteristic test adopts a mode of comparing the waveform of the relation curve of the rotor current and the stator current, so that the error is large, the reliability is low, and the internal defects of the stator winding and the rotor winding are difficult to find.
Disclosure of Invention
The invention provides a method and a device for testing short-circuit current-rising characteristics of a generator, which are used for improving the accuracy, the reliability and the standardization of the short-circuit current-rising characteristic test.
According to an aspect of the present invention, there is provided a short-circuit current-rising characteristic test method for a generator, including:
controlling the stator current of each phase of the generator to rise to a set maximum current threshold;
when the stator current of each phase of the generator meets a first preset condition, acquiring a stator current value of each phase, and when the stator current of each phase of the generator meets a second preset condition, acquiring a stator current value of each phase, and calculating a three-phase current balance quality coefficient according to the stator current value of each phase acquired under the first preset condition and the stator current value of each phase acquired under the second preset condition;
when the stator current of each phase of the generator meets a third preset condition, acquiring a temperature value of a stator winding, and calculating a temperature qualification coefficient of the stator winding according to the temperature value of the stator winding;
controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the qualification coefficient of the short circuit characteristic according to a plurality of stator current values and a plurality of rotor current values;
and determining whether the generator has a short circuit fault or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient.
Optionally, the first preset condition is: within a preset error range, the stator current value of each phase is equal to 0.5I N ；
The second preset condition is that the stator current value of each phase is equal to 1.0I within the preset error range N ；
The third preset condition is that the stator current value of each phase is equal to 1.1I N The method comprises the steps of carrying out a first treatment on the surface of the Wherein I is N Is the rated current value of the stator of the generator.
Optionally, before the stator current of each phase of the control generator increases to the maximum current threshold, the method further comprises:
controlling the generator to operate at a rated rotational speed;
controlling the rotor current rise so that the stator current of each phase rises;
before the stator current of each phase of the control generator is reduced to zero, the method further comprises:
the rotor current reduction is controlled such that the stator current of each phase is reduced.
Optionally, the calculating a three-phase current balance quality coefficient according to the stator current value of each phase acquired under the first preset condition and the stator current value of each phase acquired under the second preset condition includes:
calculating a first balance coefficient according to the maximum value, the minimum value, the average value and the first set value in the stator current values of each phase obtained under the first preset condition;
calculating a second balance coefficient according to the maximum value, the minimum value, the average value and the first set value in the stator current values of each phase obtained under the second preset condition;
and determining whether the three-phase current balance mass coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient.
Optionally, the calculating the temperature qualification coefficient of the stator winding according to the temperature value of the stator winding includes:
acquiring temperature values of a plurality of temperature sensors arranged on the stator winding;
determining a first temperature qualification coefficient according to the maximum value of the temperature values and a set temperature threshold value;
determining a second temperature qualification coefficient according to a plurality of the temperature values and the average value of the temperature values;
and determining whether the temperature qualification coefficient of the stator winding is equal to the fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient.
Optionally, the calculating the short-circuit characteristic qualification coefficient according to the plurality of stator current values and the plurality of rotor current values includes:
generating a stator matrix according to each stator current value and an average value of a plurality of stator current values obtained when the stator currents of each phase are reduced by a set interval;
generating a rotor matrix according to each rotor current value and an average value of a plurality of rotor current values obtained when the stator current of each phase decreases by a set interval;
generating a stator-rotor correlation coefficient according to the stator matrix and the rotor matrix;
and determining whether the short circuit characteristic qualification coefficient is equal to the fixed value according to the magnitude of the stator-rotor correlation coefficient and a third set value.
Optionally, the determining whether the generator has a short circuit fault according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient includes:
if the sum of the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient is equal to a fixed value which is 3 times, determining that the generator is normal;
and if the sum of the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient is not equal to a fixed value which is 3 times, determining that the short circuit fault occurs to the generator.
According to another aspect of the present invention, there is provided a short-circuit current-rising characteristic test apparatus of a generator, including:
the current rising module is used for controlling the stator current of each phase of the generator to rise to a set maximum current threshold value;
the balance quality coefficient determining module is used for obtaining the stator current value of each phase when the stator current of each phase of the generator meets a first preset condition, obtaining the stator current value of each phase when the stator current of each phase of the generator meets a second preset condition, and calculating a three-phase current balance quality coefficient according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition;
the temperature qualification coefficient determining module is used for acquiring a temperature value of the stator winding when the stator current of each phase of the generator meets a third preset condition, and calculating the temperature qualification coefficient of the stator winding according to the temperature value of the stator winding;
the short circuit characteristic qualification coefficient determining module is used for controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of three phases when the stator current of each phase is reduced by a set interval, and calculating the short circuit characteristic qualification coefficient according to a plurality of stator current values and a plurality of rotor current values;
and the fault determining module is used for determining whether the generator has a short circuit fault or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient.
Optionally, the balance quality coefficient determining module includes:
a first balance coefficient determining unit, configured to calculate a first balance coefficient according to a maximum value, a minimum value, an average value, and a first set value of the stator current values of each phase obtained under the first preset condition;
a second balance coefficient determining unit, configured to calculate a second balance coefficient according to a maximum value, a minimum value, an average value, and a first set value of the stator current values of each phase acquired under the second preset condition;
and the fault determining unit is used for determining whether the three-phase current balance quality coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient.
Optionally, the temperature qualification coefficient determining module includes:
a temperature acquisition unit for acquiring temperature values of a plurality of temperature sensors provided on the stator winding;
the first temperature qualification coefficient determining unit is used for determining a first temperature qualification coefficient according to the maximum value of the plurality of temperature values and a set temperature threshold value;
a second temperature coefficient determining unit, configured to determine a second temperature qualification coefficient according to a plurality of the temperature values and an average value of the plurality of the temperature values;
and the temperature qualification coefficient determining unit is used for determining whether the temperature qualification coefficient of the stator winding is equal to the fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient.
The short-circuit current rise characteristic test method of the generator provided by the embodiment of the invention comprises the steps of controlling the stator current of each phase of the generator to rise; when the stator current of each phase of the generator meets a first preset condition, acquiring a stator current value of each phase, when the stator current of each phase of the generator meets a second preset condition, acquiring the stator current value of each phase, and calculating a three-phase current balance mass coefficient according to the stator current value of each phase acquired under the first preset condition and the stator current value of each phase acquired under the second preset condition; when the stator current of each phase of the generator meets a third preset condition, acquiring a temperature value of a stator winding, and calculating a temperature qualification coefficient of the stator winding according to the temperature value of the stator winding; controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the qualification coefficient of the short circuit characteristic according to a plurality of stator current values and a plurality of rotor current values; and determining whether the generator has short circuit faults or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient. In the embodiment, the whole process of the short-circuit current rising characteristic test of the generator is normalized so as to effectively check whether the stator and the rotor of the generator have short-circuit faults or not, and finally determine whether the generator has faults or not according to each coefficient, and compared with the comparison analysis according to waveforms, the accuracy and the reliability of test results are improved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for testing a short-circuit current-rising characteristic of a generator according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for testing short-circuit current-up characteristics of a generator according to a second embodiment of the present invention;
fig. 3 is a wiring diagram of a method for testing a short-circuit current-rising characteristic of a generator according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of a short-circuit current-rising characteristic test device of a generator according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a flowchart of a short-circuit current-raising characteristic test method for a generator according to an embodiment of the present invention, where the embodiment is applicable to a case of testing whether a stator winding and a rotor winding of the generator are faulty, the method may be performed by a short-circuit current-raising characteristic test device for a generator, and the short-circuit current-raising characteristic test device for a generator may be implemented in hardware and/or software. As shown in fig. 1, the method includes:
s110: the stator currents of the generator phases are controlled to rise to a set maximum current threshold.
The generator comprises three phases of A phase, B phase and C phase, after the generator is started, the currents of the A phase, the B phase and the C phase of the generator are controlled to gradually rise from zero until the stator currents of the A phase, the B phase and the C phase rise to the set maximum current threshold value within the allowable error range, and the current rise is stopped. ExampleThe preset error range may be a fluctuation range of ±0.05. The stator current of each phase can be set to rise to 1.1I N ，I N For the rated current value of the generator stator, therefore, the maximum current threshold can be set to 1.15I, taking into account the fluctuation range of the upper error N 。
S120: when the stator current of each phase of the generator meets a first preset condition, the stator current value of each phase is obtained, when the stator current of each phase of the generator meets a second preset condition, the stator current value of each phase is obtained, and the three-phase current balance mass coefficient is calculated according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition.
Illustratively, the first preset condition and the second preset condition are different. The first preset condition may be that the stator current value of each phase is equal to the rated current value of the stator of the first preset multiple within a preset error range, and the second preset condition may be that the stator current value of each phase is equal to the rated current value of the stator of the second preset multiple within the preset error range, and the first preset multiple and the second preset multiple are different. Optionally, the first preset condition is: within a preset error range, the stator current value of each phase is equal to 0.5I N The second preset condition is that the stator current value of each phase is equal to 1.0I within the preset error range N . That is, during the gradual rise of the stator current of the generator, the stator current in each phase of the generator is at 0.45I N To 0.55I N When the stator current value is within the range of (a), the stator current value of the phase (B) and the stator current value of the phase (C) are obtained. Notably, the stator currents of the generator phases may be at 0.45I for more than one instant N To 0.55I N Within the range of (1), the stator current in each phase of the generator in the embodiment is 0.45I N To 0.55I N The stator current value of each phase is obtained at the earliest time in the range of (a), and the same applies to the similar cases, and the description thereof will not be repeated. Similarly, the stator current in each phase of the generator is 0.95I N To 1.05I N Within the range of (2), the stator current value of the A phase, the stator current value of the B phase and the stator current of the C phase are obtainedThe current value, for example, if the difference between the minimum value and the maximum value of the stator current values in three phases obtained under the condition of satisfying the first preset condition is smaller than the first set threshold value, and the difference between the minimum value and the maximum value of the stator current values in three phases obtained under the condition of satisfying the second preset condition is smaller than the first set threshold value, the balance mass coefficient of the three-phase current is equal to a fixed value, the fixed value may be 1, otherwise, the balance mass coefficient of the three-phase current is equal to 0.
S130: and when the stator current of each phase of the generator meets a third preset condition, acquiring a temperature value of the stator winding, and calculating a temperature qualification coefficient of the stator winding according to the temperature value of the stator winding.
A plurality of temperature sensors may be disposed on the stator winding to obtain a plurality of temperature values of the stator winding. Optionally, the third preset condition is that the stator current value of each phase is equal to 1.1I N I.e. the stator currents in each phase of the generator are all at 1.05I N To 1.15I N At the earliest time within the range of (2), the temperature value of each temperature sensor at the moment is obtained. The maximum value of the plurality of temperature values is compared with the temperature limit value, and the temperature qualification coefficient of the stator winding is generated according to the magnitude relation of the maximum value and the temperature limit value, specifically, when the maximum value of the temperature is smaller than the temperature limit value, the temperature qualification coefficient of the stator winding is equal to a fixed value, for example, 1, and when the maximum value of the temperature is greater than or equal to the temperature limit value, the temperature qualification coefficient of the stator winding is equal to 0.
S140: and controlling the stator current of each phase of the generator to be reduced to zero, acquiring the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the qualification coefficient of the short circuit characteristic according to the plurality of stator current values and the plurality of rotor current values.
Exemplary, the set interval may be 5%I N 、10％I N 、15％I N Or other numerical values, which are not particularly limited in this embodiment. It is noted that the stator current value and the rotor current value of any one phase are the same phase current value, e.g. at each decrement of 5%I of the stator current N At the time, the stator current value and the rotor current of the A phase are obtainedThe value of the stator current value and the rotor current value of the B phase or the stator current value and the rotor current value of the C phase are obtained. Taking phase A as an example, the stator current value in phase A is set to be 1.1I N In the process of decreasing to 0, the current decreases 5%I each time N When the stator current value and the rotor current value are collected, a stator current average value is calculated according to a plurality of stator current values, a rotor current average value is calculated according to a plurality of rotor current values, at the same moment, the difference between the stator current value and the stator current average value is multiplied by the difference between the rotor current value and the rotor current average value, the results at a plurality of moments are added, a short circuit characteristic qualification coefficient is generated according to the final result and the second set threshold value, and the short circuit characteristic qualification coefficient is equal to a fixed value, for example, 1 when the result is smaller than the second set threshold value, and is equal to 0 when the result is larger than or equal to the second set threshold value.
S150: and determining whether the generator has short circuit faults or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient.
And determining whether the generator has a short circuit fault according to the sum of the three coefficients, taking a fixed value as 1 as an example, determining that the generator is normal when the sum of the three coefficients is more than or equal to a double fixed value, and determining that the stator and the rotor of the generator have faults when the sum of the three coefficients is less than the double fixed value.
In the embodiment, the whole process of the short-circuit current rising characteristic test of the generator is normalized so as to effectively check whether the stator and the rotor of the generator have short-circuit faults or not, and finally, whether the generator has faults or not is determined according to each coefficient, and compared with the analysis according to waveforms, the accuracy and the reliability of test results are improved.
Example two
Fig. 2 is a flowchart of a method for testing short-circuit current-up characteristics of a generator according to a second embodiment of the present invention, as shown in fig. 2, the method includes:
s111: the stator currents of the generator phases are controlled to rise to a set maximum current threshold.
Optionally, before controlling the stator current of each phase of the generator to rise, the method further comprises:
the generator is controlled to operate at a nominal rotational speed.
Fig. 3 is a wiring diagram of a method for testing short-circuit current-rising characteristics of a generator according to a second embodiment of the present invention, referring to fig. 3, before testing, a phase a 01, a phase B02 and a phase C03 of the generator are shorted by a conductor 04, such as a copper conductor or an aluminum conductor. After the short circuit is completed, the generator 06 is controlled to operate at the rated rotation speed.
The rotor current rise is controlled so that the stator current of each phase rises.
The current of the rotor 07 of the generator 06 is regulated by the excitation system 05 such that the current of the rotor 07 increases. The trend of the stator current is the same as that of the rotor current, and therefore, the stator current is raised by raising the rotor current.
S121: and calculating a first balance coefficient according to the maximum value, the minimum value, the average value and the first set value of the stator current values of each phase obtained under the first preset condition.
Exemplary, during the rise of the stator current of each phase, the stator current in each phase is at 0.45I N To 0.55I N At the earliest time within the range of (a), the stator current values of the a phase 01, the B phase 02 and the C phase 03 are obtained. Wherein the current value of each phase can be obtained by each corresponding current sensor 08. Exemplary, rated current value I of the stator N The obtained stator current value { I ] of each phase is 9.62KA A0.5 ，I B0.5 ，I C0.5 } = {4773a,4756a,4744a }, where I i0.5 The stator current value at the earliest moment in time under the first preset condition is satisfied for each phase of the i phase, wherein i is A, B, C. From the above data, the maximum value of the stator current value in three phases is I Max0.5 =4773A, minimum I Min0.5 =4744A, average I p0.5 = (4773+4756+4744)/3= 4757.67a. Calculating a first stator matrix H1 according to the maximum value, the minimum value and the average value of the stator current values of each phase obtained under a first preset condition, wherein the specific relation satisfies the following formula:
according to the first stator matrix H1 and the first set value, a first balance coefficient gamma 1 is calculated. By way of example, the first set point may be 1%,
that is, if the maximum value I among the stator current values of the respective phases Max0.5 And minimum value I Min0.5 Difference from average I p0.5 If the ratio of (2) is smaller than the first set value, the first balance coefficient γ1 is equal to a fixed value such as 1; if the maximum value I among the stator current values of each phase Max0.5 And minimum value I Min0.5 Difference from average I p0.5 The ratio of (2) is greater than or equal to the first set value, the first balance coefficient gamma 1 Equal to 0.
S131: and calculating a second balance coefficient according to the maximum value, the minimum value, the average value and the first set value of the stator current values of each phase obtained under the second preset condition.
The stator current in each phase is at 0.95I N To 1.05I N At the earliest time within the range of (a), the stator current values of the a phase 01, the B phase 02 and the C phase 03 are obtained. Exemplary, the obtained stator current values { I } A1.0 ，I B1.0 ，I C1.0 } = {9579a,9601a,9613a }, where I i1.0 The stator current value at the earliest moment in time at which each phase of the generator satisfies the second preset condition is satisfied for the i phase. From the above data, the maximum value of the stator current value in three phases is I Max1.0 =9613A, minimum I Min1.0 = 9579a, average I p1.0 = (9579+9601+9613)/3= 9597.67a. Calculating a second stator matrix H2 according to the maximum value, the minimum value and the average value of the stator current values of each phase obtained under a second preset condition, wherein the specific relation satisfies the following formula:
calculating a second balance coefficient gamma according to the second stator matrix H2 and the first set value 2 . By way of example, the first set point may be 1%,
that is, if the maximum value I among the stator current values of the respective phases Max1.0 And minimum value I Min1.0 Difference from average I p1.0 The ratio of (2) is smaller than the first set value, the second balance coefficient gamma 2 Equal to a fixed value such as 1; if the maximum value I among the stator current values of each phase Max1.0 And minimum value I Min1.0 Difference from average I p1.0 The ratio of (2) is greater than or equal to the first set value, the second balance coefficient gamma 2 Equal to 0.
S141: and determining whether the three-phase current balance mass coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient.
If the first balance coefficient gamma 1 And a second balance coefficient gamma 2 The sum is equal to 2, and the three-phase current balance mass coefficient gamma is equal to a fixed value, namely 1; if the first balance coefficient gamma 1 and the second balance coefficient gamma 2 And if the sum is not equal to 2, the three-phase current balance mass coefficient gamma is equal to 0.
S151: temperature values of a plurality of temperature sensors provided on the stator winding are acquired.
In this embodiment, it is exemplarily shown that 45 embedded temperature sensors are provided on the stator winding, and the stator current in each phase is 1.05I N To 1.15I N At the earliest moment in the range of (a), the obtained stator winding temperature data { t1, t2, t3 … … tn } = {65.4 ℃,64.3 ℃,64.8 ℃,65.7 ℃,65.2 ℃,64.6 ℃,63.5 ℃,63.8 ℃,65.7 ℃,65.7 ℃,65.1 ℃,64.0 ℃,64.3 ℃,65.2 ℃,63.8 ℃,63.0 ℃,64.6 ℃,65.2 ℃,63.9 ℃,65.5 ℃,65.9 ℃,63.9 ℃,63.4 ℃,64.1 ℃,65.7 ℃,65.0 ℃,64.3 ℃,64.9 ℃,64.2 ℃,64.8 ℃,63.8 ℃,63.6 ℃,63.9 ℃,63.2 ℃,64.5 ℃,64.9 ℃,64.1 ℃,64.3 ℃,64.1 ℃,64.6 ℃,65.2 ℃,65.8 ℃,64.2 ℃,63.8 ℃,64.0 ℃, wherein n is the number of embedded temperature sensors, tf is the temperature value on the f-th temperature sensor.
S161: and determining a first temperature qualification coefficient according to the maximum value of the plurality of temperature values and the set temperature threshold value.
The set temperature threshold is determined according to the insulation level of the stator winding of the generator, and by way of example, the insulation level of the stator winding of the generator is F, and the corresponding tolerance temperature is 155 ℃, and then the set temperature threshold k=155×80% =125 ℃. According to the maximum value t in a plurality of temperature values Max And the magnitude relation between the set temperature threshold K generates a first temperature qualification coefficient lambda 1 ：
From the above temperature values, t Max =65.9 ℃, first temperature pass coefficient λ 1 ＝1。
S171: and determining a second temperature qualification coefficient according to the plurality of temperature values and the average value of the plurality of temperature values.
Temperature average t of stator winding temperature data { t1, t2, t3 … … tn } of generator p Calculation of each temperature value tf and temperature mean value t =64.52℃ p The maximum percent difference t of (2) r ＝|tf-t p |/t p *100% = 2.36%. According to the respective temperature value tf and the temperature average value t p The maximum percent difference t of (2) r Generating a second temperature qualification coefficient lambda according to the magnitude relation with the second set value 2 Specifically, the following formula is satisfied:
therefore, the second temperature pass coefficient lambda 2 ＝1。
S181: and determining whether the temperature qualification coefficient of the stator winding is equal to a fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient.
If the first temperature is qualified by coefficient lambda 1 And a second temperature pass coefficient lambda 2 If the sum of (2) is equal to the fixed value, e.g. 1, the temperature coefficient of pass lambda of the stator winding is equal to the fixed value, if the first temperature coefficient of pass lambda is 1 And a second temperature pass coefficient lambda 2 And is not equal to 2, the temperature coefficient of pass lambda of the stator winding is equal to 0.
S191: and generating a stator matrix according to each stator current value and the average value of a plurality of stator current values, wherein the stator current value is acquired when the stator current of each phase is decreased by a set interval.
Optionally, before controlling the stator current of each phase of the generator to decrease to zero, the method further comprises:
the rotor current reduction is controlled such that the stator current of each phase is reduced.
Illustratively, when the rotor current is controlled to gradually rise to a certain value, the stator current value of each phase is equal to 1.1I within a preset error range N The rotor current is then controlled to decrease so that the stator current of each phase gradually decreases to zero without controlling the rotor current to continue to rise.
In the present embodiment, the stator current value of the a phase is exemplarily shown at every 10% decrease of the stator current of each phase, and in other embodiments, the current value of the B phase or the current value of the C phase may be obtained. Acquired stator current matrix of multiple A phases
E 1 ＝{I g1.1 ,I g1.0 ,I g0.9 ,I g0.8 ,I g0.7 ,I g0.6 ,I g0.5 ,I g0.4 ,I g0.3 ,I g0.2 ,I g0.1 The } = {10435a,9579a,8601a,7678a,6725a,5759a,4773a,3837a,3045a,1912a,928a }, where I gM The stator current values for each phase are equal to MI within a preset error range N Stator current value of phase a. The average value of the stator current can be calculated according to the 11 stator current valuesThe stator matrix H3 satisfies the following formula: />
S201: a rotor matrix is generated from each rotor current value obtained at each decreasing set interval of stator currents of each phase and an average value of a plurality of rotor current values.
The same method as the method for obtaining the stator current value of the A phase obtains a plurality of rotor current values of the A phase and a matrix of the obtained rotor current values of the A phase
E 2 ＝{I r1.1 ,I r1.0 ,I r0.9 ,I r0.8 ,I r0.7 ,I r0.6 ,I r0.5 ,I r0.4 ,I r0.3 ,I r0.2 ,I r0.1 } = {1287a,1189a,1074a,954a,831a,711a,594a,473a, 356 a,226a,106a }. Wherein I is rM The rotor current values for each phase are equal to MI within a preset error range N Rotor current value of phase a. From the above 11 rotor current values, an average value I of the rotor current can be calculated r0 . The rotor matrix H4 satisfies the following formula:
s211: and generating the stator-rotor correlation coefficient according to the stator matrix and the rotor matrix.
Number of interrelationships between stator and rotor
S221: and determining whether the short-circuit characteristic qualification coefficient is equal to a fixed value according to the magnitude of the stator-rotor correlation coefficient and the third set value.
The third set value may be 0.9, if the number of stator-rotor correlations r is greater than or equal to 0.9, the short-circuit characteristic pass coefficient u is equal to a fixed value, that is, equal to 1, and if the number of stator-rotor correlations r is less than 0.9, the short-circuit characteristic pass coefficient u is equal to 0.
S231: and determining whether the generator has short circuit faults or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient.
Optionally, if the sum of the three-phase current balance mass coefficient gamma, the temperature qualified coefficient lambda of the stator winding and the short-circuit characteristic qualified coefficient u is equal to a fixed value which is 3 times, namely equal to 3, determining that the generator is normal;
if the sum of the three-phase current balance quality coefficient gamma, the temperature qualification coefficient lambda of the stator winding and the short-circuit characteristic qualification coefficient u is not equal to a fixed value which is 3 times, namely the sum of the three is not equal to 3, determining that the short-circuit fault occurs in the generator.
In the embodiment, the whole process of the short-circuit current rising characteristic test of the generator is normalized to effectively test whether the stator and the rotor of the generator have short-circuit faults or not, and the calculation process of the three-phase current balance quality coefficient, the temperature qualified coefficient of the stator winding and the short-circuit characteristic qualified coefficient is given in detail, so that the feasibility of the test is ensured, and the calculation process is simple and easy to realize. Meanwhile, according to the magnitude relation among the three-phase current balance quality coefficient, the sum of the temperature qualified coefficient and the short circuit characteristic qualified coefficient of the stator winding and a fixed value which is 3 times, whether the generator fails or not is determined, and compared with comparison analysis according to waveforms, the accuracy and the reliability of a test result are improved.
Example III
Fig. 4 is a schematic structural diagram of a short-circuit current-rising characteristic test device of a generator according to a third embodiment of the present invention. As shown in fig. 4, the apparatus includes:
an up-flow module 10 for controlling the stator currents of the generator phases to rise to a set maximum current threshold;
the balance quality coefficient determining module 11 is configured to obtain a stator current value of each phase when the stator current of each phase of the generator meets a first preset condition, obtain a stator current value of each phase when the stator current of each phase of the generator meets a second preset condition, and calculate a three-phase current balance quality coefficient according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition;
the temperature qualification coefficient determining module 12 is configured to obtain a temperature value of the stator winding when the stator current of each phase of the generator meets a third preset condition, and calculate a temperature qualification coefficient of the stator winding according to the temperature value of the stator winding;
the short-circuit characteristic qualification coefficient determining module 13 is used for controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the short-circuit characteristic qualification coefficient according to the plurality of stator current values and the plurality of rotor current values;
the fault determining module 14 is configured to determine whether the generator has a short circuit fault according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding, and the short circuit characteristic qualification coefficient.
Optionally, the balancing quality coefficient determining module includes:
a first balance coefficient determining unit, configured to calculate a first balance coefficient according to a maximum value, a minimum value, an average value, and a first set value in the stator current values of each phase acquired under a first preset condition;
a second balance coefficient determining unit, configured to calculate a second balance coefficient according to a maximum value, a minimum value, an average value, and a first set value of the stator current values of each phase acquired under a second preset condition;
and a fault determining unit for determining whether the three-phase current balance mass coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient.
Optionally, the temperature qualification coefficient determining module includes:
a temperature acquisition unit for acquiring temperature values of a plurality of temperature sensors provided on the stator winding;
a first temperature qualification coefficient determining unit for determining a first temperature qualification coefficient according to a maximum value of the plurality of temperature values and a set temperature threshold value;
a second temperature coefficient determining unit, configured to determine a second temperature qualification coefficient according to the plurality of temperature values and an average value of the plurality of temperature values;
and the temperature qualification coefficient determining unit is used for determining whether the temperature qualification coefficient of the stator winding is equal to a fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient.
Optionally, the short circuit characteristic qualification coefficient determining module includes:
a stator matrix determining unit for generating a stator matrix according to each stator current value and an average value of a plurality of stator current values obtained when the stator current of each phase decreases by a set interval;
a rotor matrix determining unit that generates a rotor matrix from an average value of each rotor current value and a plurality of rotor current values obtained when the stator currents of the phases are decreased by a set interval;
a stator-rotor correlation number determining unit for generating a stator-rotor correlation coefficient according to the stator matrix and the rotor matrix;
and the short circuit characteristic qualification coefficient determining unit is used for determining whether the short circuit characteristic qualification coefficient is equal to a fixed value according to the mutual correlation coefficient of the stator and the rotor and the third set value.
Optionally, the fault determination module 14 includes:
a first fault determining unit configured to determine that the generator is normal when a sum of the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding, and the short-circuit characteristic qualification coefficient is equal to a fixed value of 3 times;
and the second fault determining unit is used for determining that the generator has a short circuit fault when the sum of the three-phase current balance mass coefficient, the temperature qualified coefficient of the stator winding and the short circuit characteristic qualified coefficient is not equal to a fixed value which is 3 times.
The short-circuit current-rising characteristic test device of the generator provided by the embodiment of the invention can execute the short-circuit current-rising characteristic test method of the generator provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method for testing the short-circuit current rising characteristic of a generator is characterized by comprising the following steps:
controlling the stator current of each phase of the generator to rise to a set maximum current threshold;
when the stator current of each phase of the generator meets a first preset condition, acquiring a stator current value of each phase, and when the stator current of each phase of the generator meets a second preset condition, acquiring a stator current value of each phase, and calculating a three-phase current balance quality coefficient according to the stator current value of each phase acquired under the first preset condition and the stator current value of each phase acquired under the second preset condition;
when the stator current of each phase of the generator meets a third preset condition, acquiring a temperature value of a stator winding, and calculating a temperature qualification coefficient of the stator winding according to the temperature value of the stator winding;
controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of the three phases when the stator current of each phase is reduced by a set interval, and calculating the qualification coefficient of the short circuit characteristic according to a plurality of stator current values and a plurality of rotor current values;
determining whether a short circuit fault exists in the generator according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient;
the calculating a three-phase current balance quality coefficient according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition comprises the following steps:
calculating a first balance coefficient according to the maximum value, the minimum value, the average value and the first set value in the stator current values of each phase obtained under the first preset condition;
calculating a second balance coefficient according to the maximum value, the minimum value, the average value and the first set value in the stator current values of each phase obtained under the second preset condition;
determining whether the three-phase current balance mass coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient;
the calculating the temperature qualification coefficient of the stator winding according to the temperature value of the stator winding comprises the following steps:
acquiring temperature values of a plurality of temperature sensors arranged on the stator winding;
determining a first temperature qualification coefficient according to the maximum value of the temperature values and a set temperature threshold value;
determining a second temperature qualification coefficient according to a plurality of the temperature values and the average value of the temperature values;
determining whether the temperature qualification coefficient of the stator winding is equal to the fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient;
the calculating a short circuit characteristic pass coefficient according to the plurality of stator current values and the plurality of rotor current values includes:
generating a stator matrix according to each stator current value and an average value of a plurality of stator current values obtained when the stator currents of each phase are reduced by a set interval;
generating a rotor matrix according to each rotor current value and an average value of a plurality of rotor current values obtained when the stator current of each phase decreases by a set interval;
generating a stator-rotor correlation coefficient according to the stator matrix and the rotor matrix;
and determining whether the short circuit characteristic qualification coefficient is equal to the fixed value according to the magnitude of the stator-rotor correlation coefficient and a third set value.
2. The method for testing the short-circuit current-up characteristic of the generator according to claim 1, wherein the first preset condition is: within a preset error range, the stator current value of each phase is equal to 0.5;
the second preset condition is that the stator current value of each phase is equal to 1.0 within a preset error range;
the third preset condition is that the stator current value of each phase is equal to 1.1; wherein, is the rated current value of the generator stator.
3. The method of claim 1, further comprising, before the stator current of each phase of the control generator increases to a maximum current threshold:
controlling the generator to operate at a rated rotational speed;
controlling the rotor current rise so that the stator current of each phase rises;
before the stator current of each phase of the control generator is reduced to zero, the method further comprises:
the rotor current reduction is controlled such that the stator current of each phase is reduced.
4. The method for testing the short-circuit current-up characteristic of the generator according to claim 1, wherein the determining whether the generator has a short-circuit fault based on the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding, and the short-circuit characteristic qualification coefficient includes:
if the sum of the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient is equal to a fixed value which is 3 times, determining that the generator is normal;
and if the sum of the three-phase current balance mass coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient is not equal to a fixed value which is 3 times, determining that the short circuit fault occurs to the generator.
5. A short-circuit current-rising characteristic test device of a generator, characterized by comprising:
the current rising module is used for controlling the stator current of each phase of the generator to rise to a set maximum current threshold value;
the balance quality coefficient determining module is used for obtaining the stator current value of each phase when the stator current of each phase of the generator meets a first preset condition, obtaining the stator current value of each phase when the stator current of each phase of the generator meets a second preset condition, and calculating a three-phase current balance quality coefficient according to the stator current value of each phase obtained under the first preset condition and the stator current value of each phase obtained under the second preset condition;
the temperature qualification coefficient determining module is used for acquiring a temperature value of the stator winding when the stator current of each phase of the generator meets a third preset condition, and calculating the temperature qualification coefficient of the stator winding according to the temperature value of the stator winding;
the short circuit characteristic qualification coefficient determining module is used for controlling the stator current of each phase of the generator to be reduced to zero, obtaining the stator current value and the rotor current value of any one phase of three phases when the stator current of each phase is reduced by a set interval, and calculating the short circuit characteristic qualification coefficient according to a plurality of stator current values and a plurality of rotor current values;
the fault determining module is used for determining whether the generator has a short circuit fault or not according to the three-phase current balance quality coefficient, the temperature qualification coefficient of the stator winding and the short circuit characteristic qualification coefficient;
the balance quality coefficient determining module comprises:
a first balance coefficient determining unit, configured to calculate a first balance coefficient according to a maximum value, a minimum value, an average value, and a first set value of the stator current values of each phase obtained under the first preset condition;
a second balance coefficient determining unit, configured to calculate a second balance coefficient according to a maximum value, a minimum value, an average value, and a first set value of the stator current values of each phase acquired under the second preset condition;
a fault determining unit that determines whether the three-phase current balance mass coefficient is equal to a fixed value according to the first balance coefficient and the second balance coefficient;
the temperature qualification coefficient determining module includes:
a temperature acquisition unit for acquiring temperature values of a plurality of temperature sensors provided on the stator winding;
the first temperature qualification coefficient determining unit is used for determining a first temperature qualification coefficient according to the maximum value of the plurality of temperature values and a set temperature threshold value;
a second temperature coefficient determining unit, configured to determine a second temperature qualification coefficient according to a plurality of the temperature values and an average value of the plurality of the temperature values;
a temperature qualification coefficient determining unit, configured to determine whether the temperature qualification coefficient of the stator winding is equal to the fixed value according to the first temperature qualification coefficient and the second temperature qualification coefficient;
the short circuit characteristic qualification coefficient determining module includes:
a stator matrix determining unit for generating a stator matrix according to each stator current value and an average value of a plurality of stator current values obtained when the stator current of each phase decreases by a set interval;
a rotor matrix determining unit that generates a rotor matrix from an average value of each rotor current value and a plurality of rotor current values obtained when the stator currents of the phases are decreased by a set interval;
a stator-rotor correlation number determining unit for generating a stator-rotor correlation coefficient according to the stator matrix and the rotor matrix;
and the short circuit characteristic qualification coefficient determining unit is used for determining whether the short circuit characteristic qualification coefficient is equal to a fixed value according to the mutual correlation coefficient of the stator and the rotor and the third set value.
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Effective date of registration: 20240605 Address after: Room 1217, No. 858, Lianhua Avenue West, Donghuan Street, Panyu District, Guangzhou, Guangdong 510000 Patentee after: INSPECTION AND TEST BRANCH OF SOUTHERN POWER GRID PEAKING FM POWER GENERATION Co.,Ltd. Country or region after: China Patentee after: Guangzhou Qiming Shuzhi Energy Technology Co.,Ltd. Address before: Room 1217, No. 858, Lianhua Avenue West, Donghuan Street, Panyu District, Guangzhou, Guangdong 510000 Patentee before: INSPECTION AND TEST BRANCH OF SOUTHERN POWER GRID PEAKING FM POWER GENERATION Co.,Ltd. Country or region before: China |