CN112444745A - Method and device for judging phase modulator field loss fault caused by pulse loss - Google Patents
Method and device for judging phase modulator field loss fault caused by pulse loss Download PDFInfo
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Abstract
本发明公开一种脉冲丢失引起的调相机失磁故障的判别方法，保护装置测量励磁变压器电流以及励磁电流；计算励磁变压器三相电流基波幅值以及直流分量。励磁变压器某一相电流的基波幅值超过门槛值Iset1，失磁保护功能瞬时投入；进一步进行保护逻辑判别：若励磁变压器某一相电流的直流分量超过门槛值Iset2，且励磁变压器三相电流的基波幅值均小于门槛值Iset3，判为调相机失磁故障，经过延时tset动作于跳闸；当励磁变压器三相电流的基波幅值均小于门槛值Iset4时，失磁保护功能经延时tset1之后退出。本发明还提出了相应的判别装置。该方法能够提高检测脉冲丢失引起的失磁故障的灵敏性。
The invention discloses a method for judging the loss of excitation fault of a phase modulation phase caused by pulse loss. A protection device measures the excitation transformer current and excitation current, and calculates the three-phase current fundamental wave amplitude and DC component of the excitation transformer. The fundamental wave amplitude of a certain phase current of the excitation transformer exceeds the threshold value I set1 , and the loss-of-excitation protection function is activated instantaneously; further protection logic judgment is performed: if the DC component of a certain phase current of the excitation transformer exceeds the threshold value I set2 , and the excitation transformer three If the fundamental amplitudes of the phase currents are all less than the threshold value I set3 , it is judged that the phase-modulator is out of field fault, and after the delay t set , the tripping action occurs; when the fundamental amplitudes of the three-phase currents of the excitation transformer are all less than the threshold value I set4 , The loss-of-excitation protection function exits after the delay time t set1 . The present invention also provides a corresponding judging device. The method can improve the sensitivity of detecting the demagnetization fault caused by pulse loss.
Description
Technical Field
The invention belongs to the field of relay protection of a power system, and particularly relates to a method and a device for judging a phase modulator field loss fault caused by pulse loss by using exciting transformer current.
Background
The novel synchronous phase modulator has the characteristics of stable operation, strong fault ride-through capability, quick dynamic response and the like, and is applied to a large scale in a direct current converter station. The phase modulator has a loss-of-field fault under the grid-connected operation condition, and for a large-scale non-salient pole phase modulator, the loss-of-field fault does not have danger to a unit, and the damage is mainly caused by that the voltage of a system is reduced due to the fact that a quite large reactive power difference exists, and if the reactive power of the system is insufficient, the stable operation of the system can be damaged, so that loss-of-field protection needs to be configured.
The excitation system is abnormal, so that pulse loss is caused, and the excitation system is a common loss-of-field fault type. The existing method for judging the loss of excitation fault generally adopts the combination of low voltage at the generator end or low voltage of a system, reverse reactive power, low excitation voltage and the like for judgment. The method can judge the loss of excitation fault only after the exciting current is reduced to a certain degree. Because the descending time of the exciting current is slow, and the sensitivity of the conventional discrimination method is low, a method for rapidly discriminating the loss-of-field fault of the phase modulator is necessary to be researched.
Disclosure of Invention
The main purposes of the invention are as follows: the method and the device for judging the phase modulator field loss fault caused by pulse loss are provided to solve the problem of low sensitivity of the conventional judging method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a phase modulator magnetic loss fault discrimination method caused by pulse loss comprises the following steps:
step 1: the protection device collects the current of the excitation transformer;
step 2: respectively calculating the three-phase current fundamental wave amplitude and the direct current component of the exciting transformer;
and step 3: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
Further, the exciting transformer current in the step 1 is exciting transformer high-voltage side or low-voltage side current.
Further, after the step 2 and before the step 3, the method further comprises:
step 30: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1And then, putting in a loss of magnetism protection function.
Further, after the step 3, the method further comprises the following steps:
and 4, step 4: when the fundamental wave amplitude values of the three-phase current of the exciting transformer are all smaller than the threshold value Iset4Time lapse t is delayed for the loss of magnetic protection functionset1And then exiting.
Further, the step 3 also comprises that after the phase modulator is judged to have a loss of field fault, the phase modulator is subjected to a set time delay tsetThe protection device acts on the trip.
Further, in step 1, the current of the excitation transformer collected by the protection device is obtained from a current transformer of the excitation transformer.
Furthermore, the amplitude of the current fundamental wave of the exciting transformer is calculated by adopting a Fourier algorithm, and the direct current component is calculated by adopting an average value algorithm.
The invention correspondingly provides a device for judging the loss-of-field fault of a phase modulator caused by pulse loss, which comprises the following components:
the acquisition unit is used for acquiring the current of the excitation transformer;
a calculation unit: the method is used for calculating the fundamental wave amplitude and the direct current component of the three-phase current of the exciting transformer;
a determination unit: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
Further, the current of the excitation transformer in the acquisition unit is the current of the high-voltage side or the low-voltage side of the excitation transformer.
Further, the apparatus further comprises:
an input unit: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1And then, putting in a loss of magnetism protection function.
Further, the apparatus further comprises:
a protection exit unit: when the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value Iset4Time delay t is carried out on the loss of magnetism protection functionset1And then exiting.
Furthermore, the judging unit also comprises a set time delay t after judging that the phase modulator is in a field loss faultsetThe protection device acts on the trip.
Further, the exciting transformer current of the collecting unit is taken from an exciting transformer current transformer.
The invention has the beneficial effects that: the existing method for judging the loss of field fault has lower sensitivity, and the method for judging the loss of field fault of the phase modulator by using the current of the exciting transformer can quickly and effectively judge the loss of field fault and quickly separate and stop the machine.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for determining a loss-of-field fault of a phase modulator caused by loss of a pulse according to the present invention;
FIG. 2 is a flowchart of an embodiment of a method for determining a loss-of-field fault of a phase modulator caused by loss of a pulse according to the present invention;
FIG. 3 is a flowchart of an embodiment of a method for determining a loss-of-field fault of a phase modulator caused by loss of a pulse according to the present invention;
FIG. 4 is a flow chart of a computer implemented method of determining a loss of field fault in a phase modulator caused by loss of pulses in accordance with the present invention;
fig. 5 is a diagram of a phase modulator protection main wiring, with the exciter transformer current measured by the protection device taken from the exciter transformer current transformer.
In the figure ImaxIs the maximum phase fundamental wave component, I, of three-phase current of the exciting transformer A, B, Cset1Threshold value, I, for loss of field protection criteriondcmaxIs maximum phase amplitude of DC component of exciting transformer current, Iset2Is a threshold value of the DC component, Iset3Is the threshold value of fundamental wave content, Iset4Exit threshold, t, for fundamental component protectionset1For protection of exit delay, tsetTo protect the action delay.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, a method for determining a phase modulator field loss fault caused by pulse loss includes the following steps:
s101: the protection device collects the current of the excitation transformer; the exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer. The exciter transformer current is taken from an exciter transformer current transformer. As shown in fig. 4, the current on the high-voltage side or the low-voltage side of the excitation transformer of the phase modulator passes through the current transformer and is connected to the protection device, and the protection device measures the current on the high-voltage side or the low-voltage side of the excitation transformer.
S102: and respectively calculating the three-phase current fundamental wave amplitude and the direct current component of the exciting transformer.
S103: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
Example 2:
as shown in fig. 2, a method for determining a phase modulator field loss fault caused by pulse loss includes the following steps:
s201: the protection device collects the current of the excitation transformer; the exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer.
S202: and respectively calculating the three-phase current fundamental wave amplitude and the direct current component of the exciting transformer.
S203: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1And then, putting in a loss of magnetism protection function.
S204: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
Example 3:
fig. 3 shows a method for determining a phase modulator field loss fault caused by pulse loss, which includes the following steps:
s301: the protection device collects the current of the excitation transformer; the exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer.
S302: and respectively calculating the three-phase current fundamental wave amplitude and the direct current component of the exciting transformer.
S303: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1And then, putting in a loss of magnetism protection function.
S3043: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
S305: when the fundamental wave amplitude values of the three-phase current of the exciting transformer are all smaller than the threshold value Iset4Time lapse t is delayed for the loss of magnetic protection functionset1And then exiting.
Fig. 4 is a flow chart of a computer implemented method for determining a phase modulation loss-of-field fault caused by pulse loss according to the present invention.
In a preferred embodiment, based on the above embodiments 1 to 3, after the phase modulator is determined to have a loss of field, the phase modulator is setA fixed delay tsetThe protection device acts on the trip.
In a preferred embodiment, on the basis of embodiments 1 to 3, the amplitude of the fundamental wave of the exciting transformer current is calculated by using a fourier algorithm, and the dc component is calculated by using an average value algorithm.
Specifically, the fundamental component of the current of the exciting transformer is calculated by adopting a Fourier algorithm, and the direct-current component is calculated by adopting an average algorithm.
(1) Fundamental component of exciting transformer current
The fundamental component is calculated by adopting a full-period Fourier algorithm, and the calculation formula is as follows:
wherein, N is the sampling point number of each power frequency period of the protection device, iφ(k) For sampling the current at the high-voltage side or the low-voltage side of the excitation transformer, Iφ.Re，Iφ.ImRespectively the real part and the imaginary part, I, of the current fundamental phasor at the high-voltage side or the low-voltage side of the excitation transformerφ.AMIs the fundamental wave amplitude of the current on the high-voltage side or the low-voltage side of the excitation transformer. Phi represents phase A, phase B and phase C, respectively. I ismaxThe max () function represents taking the maximum value for the maximum phase fundamental component of the three phase current of the field transformer A, B, C.
(2) DC component of exciting transformer current
The direct current component is calculated by an average algorithm.
Wherein, N is the sampling point number of each power frequency period of the protection device, ia(k)、ib(k)、ic(k) Respectively as the sampling values of the currents of the phases A, B and C at the high-voltage side or the low-voltage side of the excitation transformer, Iadc，Ibdc，IcdcRespectively is the average value of the A phase current, the average value of the B phase current and the C phase current at the high-voltage side or the low-voltage side of the exciting transformerAverage value, IdcmaxFor the maximum phase dc component of the three-phase current of the excitation transformer A, B, C, the max () function represents taking the maximum value.
(3) The judgment of the loss of field fault of the phase modulator is realized as follows:
1) the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1Protection input
Imax>Iset1Formula (3)
Wherein, Iset1The threshold value is used as the loss-of-field protection criterion, and is generally 5-30% ITnIn which ITnThe secondary rated current of the excitation transformer.
2) The DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2
Idcmax>Iset2Formula (4)
Wherein, Iset2The threshold value of the direct current component is generally 10 to 70 percent ITn。
3) The fundamental wave amplitude values of the three-phase current of the exciting transformer are all smaller than a threshold value Iset3
Imax<Iset3Formula (5)
Wherein, Iset3The fundamental wave content threshold value is generally 3-5 percent ITn。
4) The fundamental wave amplitude values of the three-phase current of the exciting transformer are all smaller than a threshold value Iset4Protection delay tset1Quit
Imax<Iset4Formula (6)
Wherein, Iset4The fundamental wave content threshold value is generally 1-2 percent ITn。tset1To protect exit delays, t is typicallyset1＝tset+ Δ t, Δ t is fixed for 1 s.
Example 4:
a phase modulator magnetic loss fault discrimination device caused by pulse loss comprises: the device comprises a collecting unit, a calculating unit and a judging unit. Wherein:
a collecting unit: the current collection device is used for collecting the current of the exciting transformer. The exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer.
A calculation unit: the method is used for calculating the fundamental wave amplitude and the direct current component of the three-phase current of the exciting transformer.
A determination unit: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as the loss of field of the phase modulator.
Example 5:
a phase modulator magnetic loss fault discrimination device caused by pulse loss comprises: the device comprises a collecting unit, a calculating unit, an input unit and a judging unit. Wherein:
a collecting unit: the current collection device is used for collecting the current of the exciting transformer. The exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer.
A calculation unit: the method is used for calculating the fundamental wave amplitude and the direct current component of the three-phase current of the exciting transformer.
An input unit: when the fundamental wave amplitude of a certain phase current of the exciting transformer exceeds a threshold value Iset1And then, putting in a loss of magnetism protection function.
A determination unit: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as a phase modulator field loss fault through a set time delay tsetThe protection device acts on the trip.
Example 6:
a phase modulator magnetic loss fault discrimination device caused by pulse loss comprises: the device comprises a collecting unit, a calculating unit, an input unit, a judging unit and a protection exit unit. Wherein:
a collecting unit: the current collection device is used for collecting the current of the exciting transformer. The exciting transformer current is the current of the high-voltage side or the low-voltage side of the exciting transformer.
A calculation unit: the method is used for calculating the fundamental wave amplitude and the direct current component of the three-phase current of the exciting transformer.
An input unit: base for a certain phase current of an exciting transformerThe amplitude value exceeding a threshold value Iset1And then, putting in a loss of magnetism protection function.
A determination unit: when the DC component of a certain phase current of the exciting transformer exceeds a threshold value Iset2And the fundamental wave amplitude values of the three-phase currents of the exciting transformer are all smaller than the threshold value Iset3And judging the fault as a phase modulator field loss fault through a set time delay tsetThe protection device acts on the trip.
A protection exit unit: when the fundamental wave amplitude of the three-phase current of the exciting transformer is smaller than the threshold value Iset4Time delay t is carried out on the loss of magnetism protection functionset1The above embodiments are only to illustrate the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modification based on the technical solution according to the technical idea of the present invention falls within the scope of the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114200348A (en) * | 2021-12-06 | 2022-03-18 | 云南电网有限责任公司保山供电局 | Method and system for judging line trip of stability control device |
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| CN114200348A (en) * | 2021-12-06 | 2022-03-18 | 云南电网有限责任公司保山供电局 | Method and system for judging line trip of stability control device |
| CN114200348B (en) * | 2021-12-06 | 2023-07-04 | 云南电网有限责任公司保山供电局 | Circuit tripping judgment method and system for stability control device |
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