CN110118931B - Automatic test method for on-site no-load characteristic of large phase modulator - Google Patents
Automatic test method for on-site no-load characteristic of large phase modulator Download PDFInfo
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- 238000000034 method Methods 0.000 claims abstract description 22
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- 230000005284 excitation Effects 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 15
- 230000005347 demagnetization Effects 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention provides a method for automatically and rapidly testing the on-site no-load characteristic of a large phase modulator, which is a method for automatically and rapidly measuring the no-load characteristic in an idling state.
Description
Technical Field
The invention relates to the technical field of field tests of rotating motors, in particular to an automatic field no-load characteristic testing method for a large phase modulator.
Background
A batch of novel high-capacity phase modulation units are configured in an extra-high voltage power grid in China, the high-capacity bidirectional transient and steady-state reactive output capacity, the overcurrent capacity and the quick response characteristic of the phase modulation units are utilized, the short-circuit ratio and the direct-current transmission limit power of a receiving-end alternating-current power grid are improved, the voltage and the system stability under the system fault are supported, precious time is provided for fault removal, and meanwhile, continuously adjustable dynamic reactive support is provided when the voltage needs to be adjusted when the direct-current system is in steady-state normal operation, so that the safe and stable operation of the extra.
The measurement of the no-load characteristic curve is an important means for detecting the excitation parameter of the rotating motor and detecting the performance change of the iron core, and the test needs to be carried out when the unit leaves a factory, is handed over on site, is overhauled or is necessary, so that the measurement of the no-load characteristic curve is an important basis for judging whether the unit can be put into operation continuously. Generally, when a no-load test is carried out, a rotating motor is dragged by a prime mover to stably operate at a rated rotating speed; under the independent excitation working condition, the excitation current is regulated to be stable at different values, the voltage at the corresponding machine end is measured, and a no-load characteristic curve is obtained through fitting.
However, on the site of the converter station, since the large phase modulator is dragged to 1.05 times of the rated rotation speed by the variable frequency starting system, the grid-connected operation is realized in the idling process, and the test of the no-load characteristic cannot be carried out as the conventional generator set is dragged by a prime motor such as a steam turbine or a water turbine or the like or the test of the no-load characteristic is carried out in a manufacturing plant by adopting an electric motor to drag and maintain the rated rotation speed. Therefore, measurement can only be carried out in a short idling process, and due to the adoption of a machine end self shunt excitation system, if a conventional separate excitation mode is adopted, excitation loop connection needs to be disconnected, and a temporary high-capacity power supply needs to be configured, so that the problems are that the field no-load characteristic measurement and data processing of the large phase modulator bring great difficulty, and serious obstacles are brought to the unit installation and operation of a novel high-capacity phase modulator unit.
At present, other related patents are invented for a manual measurement method for idle speed characteristic measurement of a large phase modulator on a relevant site, and the problems of low automation degree, high requirement on post-processing capacity and the like exist in an automatic measurement means, so that the manual measurement method still needs to be further developed.
Disclosure of Invention
The invention provides a method for automatically and quickly measuring the no-load characteristic in an idle state by using the soft start function of an automatic excitation regulator of a large phase modulator, which is used for solving the problems that the no-load characteristic test is difficult to carry out on site and the automation degree is low because the existing phase modulator has no prime motor, adopts a machine end self-shunt excitation mode, has short idle running time and the like.
An automatic test method for the on-site no-load characteristic of a large phase modulator comprises the following steps:
(1) determining the maximum no-load voltage U according to the test measurement requirementsmaxSaid maximum no-load voltage UmaxThe maximum no-load voltage at rated rotation speed can be determined by reference to relevant standards and technical protocols, and the rated voltage U at the generator end is usually 1.2 times when no boost transformer is connectedN；
(2) Inputting overvoltage protection and low-frequency protection, and setting according to an actual operation protection value;
(3) setting the initial voltage building current value of main excitation as the minimum excitation current value of the unit capable of boosting normally after the start-up exit, and corresponding terminal voltage U at the moment0About 0.1-0.2UN；
(4) The voltage ring control is adopted, and the target voltage value at the machine end is UgIts frequency-converted value UgeqEqual to the maximum no-load test voltage Umax；
(5) Normally starting the phase modulation unit to 1.05 times of rated rotation speed, exiting the SFC variable frequency starting device, setting the main excitation voltage building process of the unit to be a soft start excitation mode, then starting excitation to be switched into main excitation, and slowly increasing the main excitation after finishing initial voltage building until the voltage at the generator end reaches a measurement target value, wherein the boosting time in the test process is controlled within 5 minutes;
(6) in the process of main excitation magnetization and unit idling, the terminal voltage U and the exciting current I are measured in real timefAnd throughObtaining the stator electrical frequency f by the real-time waveform of the terminal voltage U, and obtaining the voltage value U under the rated frequency by performing frequency conversion on the terminal voltage U in real timeeqAnd generating an original no-load characteristic curve If-UeqThe curve can be directly used as the unit no-load characteristic historical data for analysis and comparison;
wherein, the frequency conversion formula is as follows:
Ueq＝fN/f*U
wherein f isNThe frequency of the rated operating voltage of the phase modulator is f, and U are the measured stator electric frequency and the terminal voltage respectively.
(7) When the terminal voltage reaches the target voltage value, i.e. when Ueq≥UgeqMaintaining the constant exciting current for a duration not longer than 1 minute, then de-magnetizing the unit, and completing the rapid measurement of the no-load characteristic curve;
(8) in the unit idling process, relevant electric quantity waveforms in the whole test process are measured and recorded, after all the electric quantity waveforms are measured and recorded and meet requirements, active loss and reactive loss of an excitation loop and a step-up transformer directly connected with a synchronous motor are fully considered, remanence conversion and demagnetization conversion are further carried out on a measurement result, a curve is translated, so that an extension line of a straight line section of the translated curve passes through an origin point of a coordinate axis, and a no-load characteristic curve of the large phase modulator is finally obtained. Wherein, the curve of the exciting current and the terminal voltage is a continuously measured curve.
The automatic measurement method for the no-load characteristic of the large phase modulator has the following remarkable advantages:
1. the voltage loop control is adopted, the target voltage is set, the magnetism is continuously increased, a continuous and smooth no-load characteristic curve can be quickly and conveniently measured, and an automatic program package is easily realized;
2. only overvoltage protection and low-frequency protection are put into use, targeted modification is not needed, and the device is high in reliability and simple to implement;
3. in the process of increasing the exciting current, the rotating speed is gradually idled to be lower than the rated rotating speed, so that the risk of overvoltage is avoided;
4. the method can be carried out under the self-shunt excitation working condition, and solves the problems of large workload and even difficult realization of on-site wire changing and temporary power supply access;
5. through demagnetization conversion, the loss of an excitation loop and the loss of a booster transformer can be fully considered, and the effectiveness of a measurement result is ensured.
Drawings
FIG. 1 is a schematic flow chart of the automatic test method for the on-site no-load characteristic of the large phase modulator;
FIG. 2 is the comparison result between the no-load characteristic curve obtained by the factory test of large phase modulator and the no-load characteristic curve and its conversion curve obtained by the method of the present invention under the idle speed.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of an automatic test method for on-site no-load characteristics of a large phase modulator, and the automatic test method for on-site no-load characteristics of the large phase modulator comprises the following steps:
(1) determining the maximum no-load voltage U of the test by referring to the relevant standards and technical protocolsmax(it means the maximum no-load voltage at the generator end under the rated rotation speed, and the rated voltage U at the generator end is usually 1.2 times when no boost change is connectedN)。
(2) Inputting overvoltage protection, and setting according to an actual operation protection value; and (5) putting low-frequency protection, and setting according to an actual operation protection value.
(3) Setting the initial voltage building current value of main excitation as the minimum excitation current value of the unit capable of boosting normally after the start-up exit, and corresponding terminal voltage U at the moment0About 0.1-0.2UN。
(4) The voltage ring control is adopted, and the target voltage value at the machine end is UgIts frequency-converted value UgeqEqual to the maximum no-load test voltage Umax。
(5) Normally starting the phase modulation unit to 1.05 times of rated rotation speed, exiting the SFC variable frequency starting device, setting the voltage building process of main excitation of the unit to be a soft start excitation mode, then starting excitation to be switched into main excitation, slowly increasing the main excitation after finishing initial voltage building until the voltage at the generator end reaches a measurement target value, determining the field increasing time by referring to a phase modulation idle curve, and finishing field increasing before low-frequency protection action.
(6) In the process of main excitation magnetization and unit idling, the terminal voltage U and the exciting current I are measured in real timefAnd obtaining the stator electrical frequency f through the real-time waveform of the terminal voltage U. Obtaining a voltage value U under a rated frequency by performing frequency conversion on the terminal voltage in real timeeqAnd generating an original no-load characteristic curve If-UeqThe curve can be directly used as the unit no-load characteristic historical data for analysis and comparison.
Wherein, the frequency conversion formula is as follows:
Ueq＝fN/f*U
wherein f isNThe frequency of the voltage for rated operation of the phase modulator is f, and U are respectively the measured frequency and the terminal voltage.
(7) When U is turnedeq≥UgeqAnd (3) keeping the exciting current constant, keeping the duration time not longer than 1 minute, then de-magnetizing the unit, and completing the rapid measurement of the no-load characteristic curve.
(8) In order to further compare with a phase modulator factory test no-load curve, after the field original no-load characteristic curve is measured and recorded, active and reactive losses of an excitation loop and a step-up transformer directly connected with a synchronous motor can be fully considered, further remanence conversion and demagnetization conversion are carried out on a measurement result, the curve is translated, so that an extension line of a straight line section of the translated curve passes through an origin of a coordinate axis, and the large phase modulator no-load characteristic curve which can be compared with a factory test is obtained.
Referring to fig. 2, the no-load characteristic curve obtained by the factory type test of the large phase modulator is compared with the no-load characteristic curve and the reduced curve thereof obtained by the method of the present invention under the idle speed. Fig. 2 shows a measurement curve and a conversion process of the curve, and compared with a test result under a non-idle speed working condition, a converted result has good consistency, and the feasibility of the method is verified.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (3)
1. An automatic test method for the field no-load characteristic of a large phase modulator is characterized by comprising the following steps:
(1) determining the maximum no-load voltage U according to the test measurement requirementsmaxSaid maximum no-load voltage UmaxThe maximum no-load voltage at the machine end under the rated rotating speed;
(2) inputting overvoltage protection and low-frequency protection, and setting according to an actual operation protection value;
(3) setting the initial voltage building current value of main excitation as the minimum excitation current value of the unit capable of boosting normally after the excitation is started and exited;
(4) the voltage ring control is adopted, and the target voltage value at the machine end is UgIts frequency-converted value UgeqEqual to the maximum no-load test voltage Umax；
(5) Normally starting the phase modulation unit to 1.05 times of rated rotation speed, exiting the SFC variable frequency starting device, setting the main excitation voltage building process of the unit to be a soft start excitation mode, then starting excitation to be switched into main excitation, and slowly increasing the main excitation after finishing initial voltage building until the voltage at the generator end reaches a measurement target value;
(6) in the process of main excitation magnetization and unit idling, the terminal voltage U and the exciting current I are measured in real timefObtaining the stator electrical frequency f through the real-time waveform of the generator terminal voltage U, and obtaining the voltage value U under the rated frequency by performing frequency conversion on the generator terminal voltage U in real timeeqAnd generating an original no-load characteristic curve If-UeqThe curve can be directly used as the unit no-load characteristic historical data for classificationAnalyzing and comparing;
wherein, the frequency conversion formula is as follows:
Ueq＝fN/f*U
wherein f isNThe frequency is the rated operating voltage frequency of the phase modulator, and f and U are the actually measured stator electric frequency and the terminal voltage respectively;
(7) when the terminal voltage reaches the target voltage value, i.e. when Ueq≥UgeqMaintaining the constant exciting current for a duration not longer than 1 minute, then de-magnetizing the unit, and completing the rapid measurement of the no-load characteristic curve;
(8) in the unit idling process, relevant electric quantity waveforms in the whole test process are measured and recorded, after all the electric quantity waveforms are measured and recorded and meet requirements, active loss and reactive loss of an excitation loop and a step-up transformer directly connected with a synchronous motor are fully considered, remanence conversion and demagnetization conversion are further carried out on a measurement result, a curve is translated, so that an extension line of a straight line section of the translated curve passes through an origin point of a coordinate axis, and a no-load characteristic curve of the large phase modulator is finally obtained.
2. The automatic test method for the on-site no-load characteristic of the large phase modulator according to claim 1, characterized in that: the maximum no-load voltage U in the step (1)maxThe nominal voltage U at the terminal, determined with reference to the relevant standards and technical protocols, is generally 1.2 times higher without any input of a step-up voltage variationN。
3. The automatic test method for the on-site no-load characteristic of the large phase modulator according to claim 1, characterized in that: and (5) controlling the boosting time of the machine terminal voltage within 5 minutes.
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