CN112098839A - Multiphase synchronous generator test circuit started in motor mode and test method - Google Patents
Multiphase synchronous generator test circuit started in motor mode and test method Download PDFInfo
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- CN112098839A CN112098839A CN202010956894.7A CN202010956894A CN112098839A CN 112098839 A CN112098839 A CN 112098839A CN 202010956894 A CN202010956894 A CN 202010956894A CN 112098839 A CN112098839 A CN 112098839A
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- synchronous generator
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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
- G01R31/34—Testing dynamo-electric machines
Abstract
The invention discloses a test circuit and a test method of a multiphase synchronous generator started in a motor mode, and solves the problem that the multiphase synchronous generator is difficult to start in a low-frequency and low-voltage mode during test. The synchronous generator comprises a tested multiphase synchronous generator (1), a first direct-current excitation power supply (3), a second direct-current excitation power supply (4), a twelve-phase synchronous generator (5), an asynchronous motor (6) and a variable frequency power supply (7), wherein the second direct-current excitation power supply (4) is electrically connected with a rotor winding of the twelve-phase synchronous generator (5), the asynchronous motor (6) is electrically connected with the variable frequency power supply (7), a stator winding voltage output end of the twelve-phase synchronous generator (5) is connected with a stator winding voltage input end of the tested multiphase synchronous generator (1), and the first direct-current excitation power supply (3) is electrically connected with an exciter (2) arranged on the multiphase synchronous generator (1). The starting current is small, and the starting process is not out of step.
Description
Technical Field
The present invention relates to a test circuit for a multiphase synchronous generator, and more particularly, to a test circuit and a test method for a multiphase synchronous generator to be started by a synchronous motor.
Background
After the multiphase synchronous generator is assembled, parameters such as vibration, noise, efficiency and the like of the multiphase synchronous generator need to be tested, a plurality of test items need to be carried out by the tested synchronous generator in a synchronous motor state, and the synchronous generator is difficult to start because of no slip characteristic of an asynchronous motor when being used as the synchronous motor; the prior art is as follows: the method comprises the steps that an assembled multiphase synchronous generator is placed on a test tool table, an exciter carried by the tested multiphase synchronous generator is supplied with power through a direct-current excitation power supply, a stator winding of the multiphase synchronous generator is supplied with power through a variable-frequency power supply to form a stator magnetic field, the stator magnetic field is enabled to start and operate in the operation mode of a motor, and test acquisition of parameters of the stator magnetic field is achieved; because the variable frequency power supply can not smoothly provide starting frequency and voltage for the stator of the synchronous generator, the starting voltage and frequency obtained by the tested multiphase synchronous generator have a step jump phenomenon, the matching of the frequency and the voltage of the stator and the rotor of the tested machine is often ineffective in the test, and the starting frequency and the voltage of the variable frequency power supply are often required to be changed for many times to successfully start the tested synchronous generator; meanwhile, because different tested motors are assembled differently, the starting voltage and frequency required in the test are different, which brings difficulty in operation to the test of the starting motor of the tested motor; in addition, the existing multiphase synchronous generator has three phases, six phases and twelve phases, and the existing variable frequency power supply is three-phase output, can only provide three-phase power supply and cannot meet the power supply input requirement of the multiphase generator; even if a variable frequency power supply can provide a multi-phase power supply, the quality of the provided multi-phase power supply is too low to meet the requirement of an input power supply of a multi-phase generator, and the test requirement of a twelve-phase synchronous generator cannot be met.
Disclosure of Invention
The invention provides a test circuit and a test method of a multiphase synchronous generator started in a motor mode, and solves the technical problem that the multiphase synchronous generator is difficult to start in a low-frequency and low-voltage mode when a motor test is carried out on the multiphase synchronous generator.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: electrically connecting the output end of a stator winding of a twelve-phase alternating current synchronous generator with the output end of a stator winding of a tested multiphase synchronous generator, and providing an excitation power supply for an exciter of the tested multiphase synchronous generator by using a direct-current excitation power supply so that the tested multiphase synchronous generator works in the state of a synchronous motor; the rotating shaft of the twelve-phase alternating current synchronous generator is connected with the rotating shaft of an asynchronous motor which drags the twelve-phase alternating current synchronous generator through a coupler, a variable frequency power supply is connected with the asynchronous motor and drives the asynchronous motor to rotate, so that the rotating speed of the asynchronous motor can be continuously adjusted from 0, and the twelve-phase alternating current synchronous generator can generate smooth gradually-rising frequency from zero; the method comprises the steps that a rotor winding of a twelve-phase alternating current synchronous generator is electrically connected with a second adjustable direct current excitation power supply through a slip ring, the voltage of the second adjustable direct current excitation power supply can be continuously adjusted from 0 to enable the twelve-phase alternating current synchronous generator to generate a smooth gradually-rising voltage from zero, the smooth gradually-rising voltage from zero and the frequency are supplied to the tested multiphase synchronous generator to achieve reliable and gentle starting, and therefore the purpose that the multiphase synchronous generator is reliably started in a low-frequency and low-voltage mode is achieved.
A test circuit of a multiphase synchronous generator started in a motor mode comprises the multiphase synchronous generator to be tested, a first direct-current excitation power supply and a second direct-current excitation power supply, the system comprises a twelve-phase synchronous generator, an asynchronous motor and a variable frequency power supply, wherein an exciter is arranged on the tested multiphase synchronous generator, a second direct current excitation power supply is electrically connected with a rotor winding of the twelve same-phase synchronous generator through a slip ring on a non-driving end of a rotor of the twelve same-phase synchronous generator, a rotating shaft of the twelve same-phase generator is mechanically connected with the asynchronous motor through a coupler, the asynchronous motor is electrically connected with the variable frequency power supply, a stator winding voltage output end of the twelve same-phase synchronous generator is connected with a stator winding voltage input end of the tested multiphase synchronous generator, and a first direct current excitation power supply is electrically connected with an exciter arranged on the multiphase synchronous generator.
The first direct current excitation power supply provides 0.9 times of rated no-load exciting current of the multi-phase synchronous generator for the exciter; the multiphase synchronous generator is a three-phase synchronous generator, or a six-phase synchronous generator, or a twelve-phase synchronous generator.
A method of testing a test circuit for a motor-started multiphase synchronous generator, comprising the steps of:
firstly, setting 3% -5% of rated frequency of a tested multiphase synchronous generator as test starting frequency of a variable frequency power supply, setting 6% -7% of rated voltage value of the tested multiphase synchronous generator as test starting output voltage of a twelve-phase synchronous generator, and setting 0.9 times of rated no-load exciting current of the multiphase synchronous generator as exciting current provided by a first direct current exciting power supply for an exciter;
secondly, providing exciting current for an exciter of the multiphase synchronous generator according to the setting of the first step; starting a second direct-current excitation power supply according to the setting of the first step; the output voltage of the second direct-current excitation power supply is adjusted to enable the test starting output voltage of the twelve-phase synchronous generator to reach 6% -7% of the rated voltage value of the tested multiphase synchronous generator; the asynchronous motor is started at a low frequency, meanwhile, the twelve-phase synchronous generator provides a low-voltage power supply for the multiphase synchronous generator, and the multiphase synchronous generator slowly rotates to enable the rotating speed of the multiphase synchronous generator to reach a stable state;
thirdly, slowly increasing the frequency of the variable frequency power supply, setting 20 percent of the rated frequency of the tested multiphase synchronous generator as the test frequency of the variable frequency power supply, enabling the twelve same-phase synchronous generators to provide 20 percent of the power supply voltage of the rated voltage value of the tested multiphase synchronous generator for the multiphase synchronous generator by adjusting the second direct current excitation power supply under the test frequency, and keeping the power factor of the multiphase synchronous generator above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply for the exciter in the speed increasing process, and acquiring test parameters under the condition;
fourthly, slowly increasing the frequency of the variable frequency power supply, setting 40 percent of the rated frequency of the tested multiphase synchronous generator as the test frequency of the variable frequency power supply, enabling the twelve same-step generator to provide the multiphase synchronous generator with the supply voltage of 40 percent of the rated voltage value of the tested multiphase synchronous generator by adjusting the second direct current excitation power supply under the test frequency, and keeping the power factor of the multiphase synchronous generator above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply for the exciter in the speed increasing process, thereby acquiring test parameters under the condition;
fifthly, slowly increasing the frequency of the variable frequency power supply, setting 70% of the rated frequency of the tested multiphase synchronous generator as the test frequency of the variable frequency power supply, enabling the twelve same-step generators to provide 70% of the power supply voltage of the rated voltage value of the tested multiphase synchronous generator for the multiphase synchronous generator by adjusting the second direct current excitation power supply under the test frequency, and keeping the power factor of the multiphase synchronous generator above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply for the exciter in the speed increasing process, and acquiring test parameters under the condition;
and sixthly, slowly increasing the frequency of the variable frequency power supply, setting 100 percent of the rated frequency of the tested multiphase synchronous generator as the test frequency of the variable frequency power supply, enabling the twelve same-step generator to provide 100 percent of the power supply voltage of the rated voltage value of the tested multiphase synchronous generator for the multiphase synchronous generator by adjusting the second direct current excitation power supply under the test frequency, and keeping the power factor of the multiphase synchronous generator to be more than 0.8 by adjusting the excitation current provided by the first direct current excitation power supply for the exciter in the speed increasing process, thereby acquiring test parameters under the condition.
The invention reliably realizes the low-frequency low-voltage start of the multiphase synchronous generator, has small starting current, no step loss in the starting process, simple and standard operation process and scientific and reasonable test data acquisition.
Drawings
FIG. 1 is a schematic diagram of the test circuit of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a test circuit of a multiphase synchronous generator started in a motor mode comprises a tested multiphase synchronous generator 1, a first direct-current excitation power supply 3 and a second direct-current excitation power supply 4, the synchronous generator comprises a twelve-phase synchronous generator 5, an asynchronous motor 6 and a variable frequency power supply 7, wherein an exciter 2 is arranged on a tested multiphase synchronous generator 1, a second direct current excitation power supply 4 is electrically connected with a rotor winding of the twelve-phase synchronous generator 5 through a slip ring 8 on a non-driving end of a rotor of the twelve-phase synchronous generator 5, a rotating shaft of the twelve-phase synchronous generator 5 is mechanically connected with the asynchronous motor 6 through a coupler 9, the asynchronous motor 6 is electrically connected with the variable frequency power supply 7, a stator winding voltage output end of the twelve-phase synchronous generator 5 is connected with a stator winding voltage input end of the tested multiphase synchronous generator 1, and a first direct current excitation power supply 3 is electrically connected with the exciter 2 arranged on the multiphase synchronous generator 1.
The first direct current excitation power supply 3 provides 0.9 times of rated no-load exciting current of the multiphase synchronous generator 1 for the exciter 2; the multiphase synchronous generator 1 is a three-phase synchronous generator, or a six-phase synchronous generator, or a twelve-phase synchronous generator.
A method of testing a test circuit for a motor-started multiphase synchronous generator, comprising the steps of:
firstly, setting 3% -5% of rated frequency of a tested multiphase synchronous generator 1 as test starting frequency of a variable frequency power supply 7, setting 6% -7% of rated voltage value of the tested multiphase synchronous generator 1 as test starting output voltage of a twelve-phase synchronous generator 5, and setting 0.9 times of rated no-load exciting current of the multiphase synchronous generator 1 as exciting current provided by a first direct current exciting power supply 3 for an exciter 2;
secondly, providing exciting current for an exciter 2 of the multiphase synchronous generator 1 according to the setting of the first step; starting a second direct-current excitation power supply 4 according to the setting of the first step; the output voltage of the second direct-current excitation power supply 4 is adjusted to enable the test starting output voltage of the twelve-phase synchronous generator 5 to reach 6% -7% of the rated voltage value of the tested multiphase synchronous generator 1; the asynchronous motor 6 is started at a low frequency, meanwhile, the twelve-phase and twelve-phase synchronous generator 5 provides a low-voltage power supply for the multiphase synchronous generator 1, and the multiphase synchronous generator 1 slowly rotates to enable the rotating speed of the multiphase synchronous generator 1 to reach a stable state;
thirdly, slowly increasing the frequency of the variable frequency power supply 7, setting 20% of the rated frequency of the tested multiphase synchronous generator 1 as the test frequency of the variable frequency power supply 7, enabling the twelve identical synchronous generators 5 to provide power supply voltage which is 20% of the rated voltage value of the tested multiphase synchronous generator 1 for the multiphase synchronous generator 1 by adjusting the second direct current excitation power supply 4 under the test frequency, enabling the power factor of the multiphase synchronous generator 1 to be kept above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply 3 for the exciter 2 in the speed increasing process, and collecting test parameters under the condition;
fourthly, slowly increasing the frequency of the variable frequency power supply 7, setting 40 percent of the rated frequency of the tested multiphase synchronous generator 1 as the test frequency of the variable frequency power supply 7, enabling the twelve same step generator 5 to provide a supply voltage which is 40 percent of the rated voltage value of the tested multiphase synchronous generator 1 for the multiphase synchronous generator 1 by adjusting the second direct current excitation power supply 4 under the test frequency, enabling the power factor of the multiphase synchronous generator 1 to be kept above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply 3 for the exciter 2 in the speed increasing process, and collecting test parameters under the condition;
fifthly, slowly increasing the frequency of the variable frequency power supply 7, setting 70% of the rated frequency of the tested multiphase synchronous generator 1 as the test frequency of the variable frequency power supply 7, enabling the twelve same-step generator 5 to provide a supply voltage which is 70% of the rated voltage value of the tested multiphase synchronous generator 1 for the multiphase synchronous generator 1 by adjusting the second direct current excitation power supply 4 under the test frequency, enabling the power factor of the multiphase synchronous generator 1 to be kept above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply 3 for the exciter 2 in the speed increasing process, and collecting test parameters under the condition;
and sixthly, slowly increasing the frequency of the variable frequency power supply 7, setting 100% of the rated frequency of the tested multiphase synchronous generator 1 as the test frequency of the variable frequency power supply 7, enabling the twelve same-step generator 5 to provide a power supply voltage which is 100% of the rated voltage value of the tested multiphase synchronous generator 1 for the multiphase synchronous generator 1 by adjusting the second direct current excitation power supply 4 under the test frequency, enabling the power factor of the multiphase synchronous generator 1 to be kept above 0.8 by adjusting the excitation current provided for the exciter 2 by the first direct current excitation power supply 3 in the speed increasing process, and collecting test parameters under the condition.
Claims (3)
1. A test circuit of a multiphase synchronous generator started in a motor mode comprises a tested multiphase synchronous generator (1), a first direct-current excitation power supply (3), a second direct-current excitation power supply (4), a twelve-identical-step generator (5), an asynchronous motor (6) and a variable frequency power supply (7), wherein an exciter (2) is arranged on the tested multiphase synchronous generator (1), and the test circuit is characterized in that the second direct-current excitation power supply (4) is electrically connected with rotor windings of the twelve-identical-step generator (5) through a slip ring (8) on a non-drive end of a rotor of the twelve-identical-step generator (5), a rotating shaft of the twelve-identical-step generator (5) is mechanically connected with the asynchronous motor (6) through a coupler (9), the asynchronous motor (6) is electrically connected with the variable frequency power supply (7), and a voltage output end of a stator winding of the twelve-identical-step generator (5) is electrically connected with a stator winding of the tested multiphase synchronous generator (1 The voltage input ends are connected together, and the first direct current excitation power supply (3) is electrically connected with an exciter (2) arranged on the multiphase synchronous generator (1).
2. A motor-started multiphase synchronous generator test circuit according to claim 1, wherein the first dc excitation power supply (3) supplies a 0.9 times rated no-load excitation current of the multiphase synchronous generator (1) to the exciter (2); the multiphase synchronous generator (1) is a three-phase synchronous generator, or a six-phase synchronous generator, or a twelve-phase synchronous generator.
3. A method of testing a test circuit for a dynamoelectric, multiphase synchronous generator as recited in claim 1, comprising the steps of:
firstly, setting 3% -5% of rated frequency of a tested multiphase synchronous generator (1) as test starting frequency of a variable frequency power supply (7), setting 6% -7% of rated voltage value of the tested multiphase synchronous generator (1) as test starting output voltage of a twelve-step synchronous generator (5), and setting 0.9 times of rated no-load exciting current of the multiphase synchronous generator (1) as exciting current provided by a first direct current exciting power supply (3) for an exciter (2);
secondly, providing exciting current for an exciter (2) of the multiphase synchronous generator (1) according to the setting of the first step; according to the setting of the first step, starting a second direct-current excitation power supply (4); the output voltage of the second direct-current excitation power supply (4) is adjusted to enable the test starting output voltage of the twelve-phase synchronous generator (5) to reach 6% -7% of the rated voltage value of the tested multiphase synchronous generator (1); the asynchronous motor (6) is started at low frequency, meanwhile, the twelve-phase synchronous generator (5) provides a low-voltage power supply for the multiphase synchronous generator (1), and the multiphase synchronous generator (1) rotates slowly, so that the rotating speed of the multiphase synchronous generator (1) reaches a stable state;
thirdly, slowly increasing the frequency of the variable frequency power supply (7), setting 20% of the rated frequency of the tested multiphase synchronous generator (1) as the test frequency of the variable frequency power supply (7), enabling the twelve same-step generator (5) to provide the multiphase synchronous generator (1) with the power supply voltage which is 20% of the rated voltage value of the tested multiphase synchronous generator (1) by adjusting the second direct current excitation power supply (4) under the test frequency, enabling the power factor of the multiphase synchronous generator (1) to be kept above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply (3) for the exciter (2) in the speed increasing process, and collecting test parameters under the condition;
fourthly, slowly increasing the frequency of the variable frequency power supply (7), setting 40% of the rated frequency of the tested multiphase synchronous generator (1) as the test frequency of the variable frequency power supply (7), enabling the twelve same-step generator (5) to provide the multiphase synchronous generator (1) with the supply voltage which is 40% of the rated voltage value of the tested multiphase synchronous generator (1) by adjusting the second direct current excitation power supply (4) under the test frequency, enabling the power factor of the multiphase synchronous generator (1) to be kept above 0.8 by adjusting the excitation current provided by the first direct current excitation power supply (3) for the exciter (2) in the speed increasing process, and collecting test parameters under the condition;
fifthly, slowly increasing the frequency of the variable frequency power supply (7), setting 70% of the rated frequency of the tested multiphase synchronous generator (1) as the test frequency of the variable frequency power supply (7), enabling the twelve same-step generator (5) to provide a supply voltage which is 70% of the rated voltage value of the tested multiphase synchronous generator (1) for the multiphase synchronous generator (1) by adjusting the second direct current excitation power supply (4) under the test frequency, enabling the power factor of the multiphase synchronous generator (1) to be kept above 0.8 by adjusting the excitation current which is provided for the exciter (2) by the first direct current excitation power supply (3) in the speed increasing process, and collecting test parameters under the condition;
and sixthly, slowly increasing the frequency of the variable frequency power supply (7), setting 100% of the rated frequency of the tested multiphase synchronous generator (1) as the test frequency of the variable frequency power supply (7), enabling the twelve same-step generator (5) to provide a power supply voltage which is 100% of the rated voltage value of the tested multiphase synchronous generator (1) for the multiphase synchronous generator (1) by adjusting the second direct current excitation power supply (4) under the test frequency, enabling the power factor of the multiphase synchronous generator (1) to be kept above 0.8 by adjusting the excitation current which is provided for the exciter (2) by the first direct current excitation power supply (3) in the speed increasing process, and collecting test parameters under the condition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010956894.7A CN112098839A (en) | 2020-09-12 | 2020-09-12 | Multiphase synchronous generator test circuit started in motor mode and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010956894.7A CN112098839A (en) | 2020-09-12 | 2020-09-12 | Multiphase synchronous generator test circuit started in motor mode and test method |
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| CN112098839A true CN112098839A (en) | 2020-12-18 |
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| CN202010956894.7A Pending CN112098839A (en) | 2020-09-12 | 2020-09-12 | Multiphase synchronous generator test circuit started in motor mode and test method |
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- 2020-09-12 CN CN202010956894.7A patent/CN112098839A/en active Pending
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