CN109387724B - Fault diagnosis method for synchronous phase modulator based on longitudinal analysis and transverse correction - Google Patents
Fault diagnosis method for synchronous phase modulator based on longitudinal analysis and transverse correction Download PDFInfo
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Abstract
The invention discloses a fault diagnosis method for a synchronous phase modulator based on longitudinal analysis and transverse correction, which adopts a fixed value longitudinal numerical analysis method to determine whether a single-phase earth fault occurs at the end of a single phase modulator and position the fault occurrence position; and determining excitation voltage disturbance of a plurality of synchronous phase modulators by adopting an average mean value transverse screening method or a transverse bubbling screening comparison method, and positioning the position where the disturbance occurs. The invention comprehensively analyzes the longitudinal and transverse data of the phase modulator to judge whether disturbance occurs and influence caused by the disturbance, improves the precision of fault diagnosis and positioning, and effectively improves the operation and maintenance efficiency of maintenance departments.
Description
Technical Field
The invention relates to an operation and maintenance data analysis technology, in particular to a fault diagnosis method for a synchronous phase modulator based on longitudinal analysis and transverse correction.
Background
The disturbance analysis of the power system is an important function for monitoring the performance of the power protection system, when disturbance occurs, impact of different degrees is generated on the electrical quantity of the system, accurate and effective fault early warning, fault positioning and fault detection are carried out on the disturbance by obtaining operation and maintenance data after the phase modulator is connected to the power grid, and the stability of the synchronous phase modulator and a connected system is guaranteed to be important. The research on phase modulators at home and abroad is analyzed, more longitudinal data of a single phase modulator is analyzed, the research on transverse data of a plurality of phase modulators is not involved, and the accuracy of fault detection and positioning is low.
Disclosure of Invention
The invention aims to provide a method for analyzing operation and maintenance data of a synchronous phase modulator based on longitudinal analysis and transverse correction, which improves the accuracy of fault detection and positioning.
The technical solution for realizing the purpose of the invention is as follows: a fault diagnosis method of a synchronous phase modulator based on longitudinal analysis and transverse correction comprises the following steps:
(1) determining whether a single-phase earth fault occurs at the end of a single phase modulator by adopting a constant value longitudinal numerical analysis method, and positioning the fault occurrence position;
(2) and determining whether the excitation voltage disturbance occurs to the plurality of synchronous phase modulators or not by adopting an average mean value transverse screening method or a transverse bubbling screening comparison method, and positioning the position where the disturbance occurs.
As a specific embodiment, the constant value longitudinal numerical analysis method is implemented by judging threeDetecting and positioning the single-phase earth fault of the phase voltage or current if the effective value of the phase voltage or the current is in a limited range, and if the effective value of the three-phase voltage meets [ U ]min，Umax]And the effective value of the three-phase current is [ I ]min1，Imax1]If the phase modulator end is judged not to have the single-phase grounding fault, otherwise, the phase modulator end is judged to have the single-phase grounding fault, and the fault occurs when the effective voltage value is smaller than UminThe effective value of the current is less than Imin1Phase of (1), wherein UminIs 70 to 90 percent of terminal voltage of the phase modifier during normal operation, Umax110-130% of terminal voltage of phase modulator in normal operationmin185% -95% of the normal operation terminal current of the phase modulator, Imax1Is 105-115% of the terminal current of the phase modulator during normal operation.
As a specific implementation mode, the average mean value transverse screening method detects and positions the excitation disturbance of the phase modulator by judging whether the effective value of the current at the generator end is in a limited range, and when the effective value of the current at the generator end of the phase modulator is larger than Imax2Sending out early warning signal to confirm phase modulator is disturbed when current effective value is larger than effective value mean value I12In a phase modulation machine, wherein Imax2Is 110-130% of the current of the phase modulator in normal operation.
As a specific implementation mode, the transverse bubbling screening comparison method detects and positions the excitation disturbance of the phase modulator by judging whether the effective value of the current at the generator end is in a limited range, and when the effective value of the current at the generator end of the phase modulator is larger than Imax2Sending out early warning signals to determine that the phase modulators are disturbed, judging whether the phase modulators have equal terminal currents at the same moment, if so, judging that a plurality of phase modulators are disturbed, otherwise, judging that the phase modulators with the largest currents are disturbed.
Compared with the prior art, the invention has the following remarkable advantages: the invention comprehensively analyzes the longitudinal and transverse data of the phase modulator to judge whether disturbance occurs and influence caused by the disturbance, improves the precision of fault diagnosis and positioning, and effectively improves the operation and maintenance efficiency of maintenance departments.
Drawings
Fig. 1 is a schematic diagram of the connection topology of a synchronous phase modulator to an SFC and an ac power grid.
Fig. 2 is a schematic diagram of a connection topology of a single synchronous phase modulator terminal with a single-phase grounding short-circuit fault.
Fig. 3 is a waveform of an effective value of a three-phase voltage when a single-phase ground short circuit occurs at a terminal of the synchronous phase modulator.
Fig. 4 is a waveform of effective values of three-phase currents when a single-phase ground short circuit occurs at the synchronous phase modulator terminal.
Fig. 5 is a flow chart of longitudinal analysis data during analysis of phase modulator end faults using a fixed value longitudinal numerical analysis.
FIG. 6 is a schematic diagram of a connection topology in which the excitation voltage of one of two synchronous phase modulators is disturbed.
Fig. 7 is a schematic diagram of the output signal of the excitation voltage control system of the synchronous phase modulator.
FIG. 8 is a waveform of effective value of current at the generator end after the excitation voltage of the synchronous phase modulator is disturbed.
FIG. 9 is a flow chart of a method for analyzing the lateral correction data of a phase modulator during a phase modulator disturbance using a mean-average lateral screening method.
FIG. 10 is a flow chart of the analysis of the lateral correction data during phase modulation perturbation using the lateral bubbling screening alignment method.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
A connection circuit diagram of a synchronous phase modulator, an SFC (static frequency converter) and an ac power grid is established, as shown in fig. 1, including the synchronous phase modulator, an excitation system, a main transformer, a grid-connected circuit breaker, the ac power grid, an SFC connection circuit breaker and an SFC frequency converter. The synchronous phase modulator is connected with a main transformer and an SFC (Small form-factor converter) connecting circuit breaker at the end, the other side of the main transformer is connected with a grid-connected circuit breaker, and the grid-connected circuit breaker is connected with an alternating current power grid; and the other side of the SFC connecting circuit breaker is connected with the SFC frequency converter. The disturbance in the power system is divided into large disturbance and small disturbance, wherein the large disturbance comprises phase modulator terminal single-phase earth fault, and the small disturbance is phase modulator excitation disturbance.
The connection topological structure of the single synchronous phase modulator end with the single-phase grounding short-circuit fault is shown in fig. 2, and voltage and current data of the single synchronous phase modulator end with the single-phase grounding short-circuit fault are analyzed by a constant value longitudinal numerical analysis method. After the phase modulator is started to be connected to the grid and stably operates, the synchronous phase modulator operates to t0When the short-circuit earth fault of A phase occurs at the machine end, the duration t1. The current and voltage data at the longitudinal analysis machine end, and the three-phase voltage and current waveforms when single-phase grounding short circuit occurs at the synchronous phase modulator end are shown in figures 3-4, wherein UA、UB、UCAre respectively the effective value of the three-phase voltage at the machine end, IA、IB、ICThe three-phase current effective values at the machine end are respectively, so that the voltage and the current are in a certain range when the single-phase grounding short circuit occurs at the machine end of the synchronous phase modulator, whether the effective values of the three-phase voltage or the current are in a limited range or not is judged, and fault early warning and fault detection can be carried out on the phase modulator.
The flow of longitudinal analysis data during phase modulator terminal single-phase earth fault period by using a constant longitudinal numerical analysis method is shown in FIG. 5, when the phase voltage of A phase is U phaseALess than UminOr phase voltage U of BBGreater than UmaxOr C phase voltage UCGreater than UmaxWhen the current is over; or phase current I of AAIs less than Imin1Or phase current I of B phaseBIs greater than Imax1Or phase current I of CCIs greater than Imax1And then, sending an alarm signal, determining that the phase modulator end has a fault and positioning a fault phase. Wherein U ismin70-90% of terminal voltage of phase modulator during normal operation (terminal voltage is U during normal operation)x)，UmaxIs 110-130% of terminal voltage of phase modulator in normal operation. I ismin185% -95% of the normal operation machine end current of the phase modulator (the normal operation machine end current is I)x1)，Imax1Is 105-115% of the terminal current of the phase modulator during normal operation.
According to the research findings at home and abroad, one or two phase modulators are mostly adopted to direct the ultrahigh voltage at presentThe current transmission ends and the current receiving ends are in reactive support, three or more of the three phase modulators are hardly involved in practical engineering application, and the condition that the two phase modulators are interfered by excitation is analyzed. A connection topological structure of a disturbed excitation voltage of one phase modulator in two synchronous phase modulators is shown in figure 6, compared with the connection topological structure in figure 1, an excitation voltage control system is added, wherein a rotor excitation winding of the synchronous phase modulator is connected with the excitation voltage control system, the other side of the excitation voltage control system is an optional excitation input value, and current data of a disturbed excitation voltage period of a plurality of synchronous phase modulators are analyzed by adopting an average value transverse screening method or a transverse bubbling screening comparison method. After the phase modulator is started to be connected to the grid and stably operates, the phase modulator operates in an excitation control system state and operates to t in the synchronous phase modulator2In the time, the master control selector selects the disturbance control system, applies a disturbance voltage of 0.5p.u. to the excitation voltage, and applies a duration t to the excitation voltage through the time sequence control system3The reset excitation control system of the master control selector outputs E through the output control systemFrealThe output signal of the excitation voltage control system of the synchronous phase modulator is shown in fig. 7, and the waveform of the effective value of the current at the generator end of the disturbed excitation voltage of the synchronous phase modulator is shown in fig. 8, so that the effective value of the current at the generator end of the disturbed excitation voltage of the synchronous phase modulator is in a certain range, and the fault early warning and the fault detection can be carried out on the phase modulator by judging whether the effective value of the current at the generator end is in a limited range.
The flow of the data for analyzing the lateral correction of the phase modulator during the disturbance by the lateral screening method of mean value is shown in FIG. 9. In the mean-average transverse screening method, I1And I2Effective values of terminal currents of phase modulators No. 1 and No. 2, I12Is the mean value of the effective values of the terminal currents of No. 1 and No. 2 phase modulators, and judges that the current I of the No. 1 phase modulator is the mean value1Is greater than Imax2Phase modulator current I of No. 2 or2Is greater than Imax2Sending out an early warning signal to determine which phase modulator is disturbed but not which phase modulator is determined; judging current I of No. 1 phase modulator1Greater than or equal to I12Phase modulator current I of No. 2 or2Greater than or equal to I12And sending an alarm signal to position which phase modulator is disturbed. Wherein Imax2Is 110-130% of the current of the phase modulator in normal operation (the current of the phase modulator is I in normal operation)x2). Similarly, when the number of phase modulators is 3 or more, the perturbation phase modulators can still be analyzed by adopting an average mean value transverse screening method.
The flow of the transverse correction data during the phase modulation machine disturbance analysis by the transverse bubbling screening comparison method is shown in fig. 10. In the transverse bubbling screening comparison method, when the current of the No. 1 phase modulator is judged to be larger than Imax2Or phase-modulating machine No. 2 with current greater than Imax2Sending out early warning information to determine which phase modulator is disturbed but not which phase modulator is determined; judging whether the currents at the machine ends of the two phase modulators are equal at the same moment, and if not, taking the maximum value of the currents at the machine ends of the two phase modulators to judge the magnitude, and sending alarm information if the current is large; when the phase modulation signals are equal, the two phase modulators can be judged to be disturbed, and alarm information is sent out. Similarly, when the number of phase modulators is 3 or more, the disturbance phase modulators can still be analyzed by adopting a transverse bubbling screening comparison method.
The method analyzes the longitudinal alarm data of a single phase modulator and the transverse alarm data of a plurality of phase modulators, can provide strategy guidance for fault isolation, and is beneficial to improving the operation and maintenance efficiency of maintenance departments.
Claims (3)
1. A fault diagnosis method of a synchronous phase modulator based on longitudinal analysis and transverse correction is characterized by comprising the following steps:
(1) determining whether a single-phase earth fault occurs at the end of a single phase modulator by adopting a constant value longitudinal numerical analysis method, and positioning the fault occurrence position;
(2) determining whether excitation voltage disturbance occurs to a plurality of synchronous phase modulators or not by adopting an average mean value transverse screening method or a transverse bubbling screening comparison method, and positioning the position where the disturbance occurs;
the fixed value longitudinal numerical analysis method detects and positions the single-phase earth fault of the camera by judging whether the effective value of the three-phase voltage or current is in a limited range, and if the effective value of the three-phase voltage meets [ U ]min，Umax]And the effective value of the three-phase current is inImin1，Imax1]If the phase modulator end is judged not to have the single-phase grounding fault, otherwise, the phase modulator end is judged to have the single-phase grounding fault, and the fault occurs when the effective voltage value is smaller than UminThe effective value of the current is less than Imin1Phase (c);
the average value transverse screening method detects and positions the excitation disturbance of the phase modulator by judging whether the effective value of the current at the generator end is in a limited range or not, and when the effective value of the current at the generator end of the phase modulator is larger than Imax2Sending out early warning signal to confirm phase modulator is disturbed when current effective value is larger than effective value mean value I12The phase modulator of (1);
the transverse bubbling screening comparison method detects and positions the excitation disturbance of the phase modulator by judging whether the effective value of the current at the machine end is in a limited range or not, and when the effective value of the current at the machine end of the phase modulator is larger than Imax2Sending out early warning signals to determine that the phase modulators are disturbed, judging whether the phase modulators have equal terminal currents at the same moment, if so, judging that a plurality of phase modulators are disturbed, otherwise, judging that the phase modulators with the largest currents are disturbed.
2. The method of claim 1, wherein U is the fault diagnosis of synchronous phase modulation machine based on longitudinal analysis and transverse correctionminIs 70 to 90 percent of terminal voltage of the phase modifier during normal operation, Umax110-130% of terminal voltage of phase modulator in normal operationmin185% -95% of the normal operation terminal current of the phase modulator, Imax1Is 105-115% of the terminal current of the phase modulator during normal operation.
3. The method of claim 1, wherein I is the fault diagnosis of synchronous phase modulation machine based on longitudinal analysis and transverse correctionmax2Is 110-130% of the current of the phase modulator in normal operation.
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| CN110488136B (en) * | 2019-08-12 | 2021-11-30 | 河海大学 | Rotor one-point grounding fault detection method of phase modulator excitation system |
| CN110617981B (en) * | 2019-09-16 | 2021-06-15 | 江苏方天电力技术有限公司 | Fault diagnosis method for phase modulator |
| CN111835018B (en) * | 2020-04-30 | 2021-09-10 | 南京理工大学 | Synchronous phase modulator starting grid-connected circuit based on time sequence hybrid excitation control and control method |
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| CN108089126A (en) * | 2017-12-04 | 2018-05-29 | 国网湖南省电力公司 | Phase modifier method for diagnosing faults, device and equipment |
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Patent Citations (7)
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| CN101507072A (en) * | 2006-08-18 | 2009-08-12 | Abb研究有限公司 | Ground fault detection |
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Effective date of registration: 20210617 Address after: No. 200, Xiaolingwei street, Xuanwu District, Nanjing City, Jiangsu Province Patentee after: NANJING University OF SCIENCE AND TECHNOLOGY Patentee after: Nanjing wanmaoda Electronic Technology Co.,Ltd. Address before: 210094 Xuanwu District, Jiangsu, Xiaolingwei 200, Nanjing Patentee before: NANJING University OF SCIENCE AND TECHNOLOGY |
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