CN111308347B - Generator testing system and method - Google Patents
Generator testing system and method Download PDFInfo
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- CN111308347B CN111308347B CN202010299935.XA CN202010299935A CN111308347B CN 111308347 B CN111308347 B CN 111308347B CN 202010299935 A CN202010299935 A CN 202010299935A CN 111308347 B CN111308347 B CN 111308347B
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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
- G01R31/343—Testing dynamo-electric machines in operation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a generator test system and a method, wherein the generator test system comprises: the power generation system comprises a transformer, a first frequency converter, a second frequency converter and a generator, wherein the first end of the first frequency converter is connected with the first low-voltage end of the transformer; the second end of the first frequency converter is connected with a first winding of the generator; the first end of the second frequency converter is connected with the second low-voltage end of the transformer; the second end of the second frequency converter is connected with a second winding of the generator; the high-voltage end of the transformer is connected with the high-voltage power supply, the generator with different levels of voltage can be tested without adopting a plurality of generators, the full power of the generator can be added only through one generator and the transformer, so that the type test task of the generator is completed, meanwhile, the secondary side of the transformer can output different levels of voltage, and the type test requirements of the generators with different levels of voltage are met.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a generator testing system and a method.
Background
At present, the power grade of the wind driven generator is developing towards a high capacity direction, and the traditional two generators are in a back-to-back dragging mode, so that the requirement on the power of a tested frequency converter is high, and the test cost is increased.
Meanwhile, the voltage of the traditional wind driven generator is 690V, and nowadays, wind driven generators with higher voltage, such as 1140V and 3100V, appear in the market, and at present, because the grade of the wind driven generator is 690V, the higher grade generator cannot be tested under the current condition.
Disclosure of Invention
The embodiment of the invention provides a generator testing system and a method, which can solve the problems that the generator testing system in the prior art is high in manufacturing cost and cannot test a generator with multiple voltage levels.
In order to solve the technical problem, the invention is realized as follows:
the embodiment of the invention provides a generator test system, which comprises: the system comprises a transformer, a first frequency converter, a second frequency converter and a generator; the first end of the first frequency converter is connected with the first low-voltage end of the transformer; the second end of the first frequency converter is connected with a first winding of the generator; the first end of the second frequency converter is connected with the second low-voltage end of the transformer; the second end of the second frequency converter is connected with a second winding of the generator; and the high-voltage end of the transformer is connected with a high-voltage power supply.
Preferably, the first winding of the generator comprises a U1 terminal, a V1 terminal and a W1 terminal, and the second winding of the generator comprises a U2 terminal, a V2 terminal and a W2 terminal; the second end of the first frequency converter is respectively connected with the U1 end, the V1 end and the W1 end; and the second end of the second frequency converter is connected with the U2 end, the V2 end and the W2 end respectively.
Preferably, the transformer is a three-phase transformer; the first low-voltage input end of the transformer is a Y-shaped secondary side; the second low-voltage input end of the transformer is a delta-shaped secondary side; the high-voltage input end of the transformer is a Y-shaped primary side.
Preferably, when the generator testing system is in an operating mode, the sum of the currents of the first winding of the generator and the second winding of the generator is the rated current of the generator.
Preferably, the power of the first frequency converter and the second frequency converter is greater than or equal to 1/2 of the power of the generator.
Preferably, the first frequency converter drives a first winding of the generator to start the generator to a half of the rated rotation speed of the generator; the second frequency converter drives a second winding of the generator to complete synchronization of grid connection; the first frequency converter drives a first winding of the generator to start the generator to the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator to load the generator to full power.
Preferably, the torques of the first winding and the second winding of the generator are equal in magnitude and opposite in direction.
The embodiment of the invention also provides a generator testing method, the generator testing system comprises a transformer, a first frequency converter, a second frequency converter and a generator, and the method comprises the following steps: the first frequency converter drives a first winding of a generator to start the generator to a half of the rated rotating speed of the generator; the first end of the first frequency converter is connected with the first low-voltage end of the transformer, and the second end of the first frequency converter is connected with the first winding of the generator; the second frequency converter drives a second winding of the generator to complete synchronization of grid connection, wherein a first end of the second frequency converter is connected with a second low-voltage end of the transformer, and a second end of the second frequency converter is connected with the second winding of the generator; the first frequency converter drives a first winding of the generator to start the generator to the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator to load the generator to full power; detecting the state parameters of the generator to judge whether the generator is normal, wherein the state parameters comprise any one of the following parameters: temperature parameters and electrical parameters.
In the embodiment of the invention, the first end of the first frequency converter is connected with the first low-voltage end of the transformer; the second end of the first frequency converter is connected with a first winding of the generator; the first end of the second frequency converter is connected with the second low-voltage end of the transformer; the second end of the second frequency converter is connected with a second winding of the generator; the high-voltage end of the transformer is connected with the high-voltage power supply, the generator with different levels of voltage can be tested without adopting a plurality of generators, the full power of the generator can be added only through one generator and the transformer, so that the type test task of the generator is completed, meanwhile, the secondary side of the transformer can output different levels of voltage, and the type test requirements of the generators with different levels of voltage are met.
Drawings
Fig. 1 is a circuit diagram of a generator testing system according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a generator testing system according to a second embodiment of the present invention;
fig. 3 is a flowchart illustrating steps of a generator testing method according to a third embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, a circuit diagram of a generator testing system according to a first embodiment of the present invention is shown.
The generator test system provided by the embodiment of the invention comprises: a transformer 101, a first frequency converter 102, a second frequency converter 103 and a generator 104. A first end 1021 of the first frequency converter 102 is connected with a first low-voltage end 1011 of the transformer 101; the second end 1022 of the first frequency converter 102 is connected to the first winding 1041 of the generator 104; the first terminal 1031 of the second frequency converter 103 is connected to the second low-voltage terminal 1012 of the transformer 101; a second end 1032 of the second frequency converter 103 is connected with a second winding 1042 of the generator 104; the high voltage end 1013 of the transformer 101 is connected to a high voltage power supply. The first winding 1041 and the second winding 1042 are not shown in fig. 1.
It should be noted that the transformer is a three-phase transformer, and a three-winding transformer is most commonly used in the power system. Compared with two common transformers, the three-winding transformer is economical, occupies less land and is more convenient to maintain and manage. The three-phase three-winding transformer usually adopts Y-Y-delta connection, i.e. the primary winding and the secondary winding are both Y-connected, and the third winding is connected into delta. The delta connection method is a closed loop and allows the same-phase third harmonic current to pass, so that the Y connection primary winding and the Y connection secondary winding do not generate third harmonic voltage. Thus, it can provide a neutral point for both the primary and secondary sides. In a long-distance power transmission system, the third winding can also be connected with a synchronous phase modulator to improve the power factor of the line.
The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detection unit micro-processing unit and the like. The frequency converter adjusts the voltage and frequency of an output power supply by switching on and off an internal IGBT, provides the required power supply voltage according to the actual requirement of the motor, and further achieves the purposes of energy saving and speed regulation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.
The generator in the generator testing system provided by the embodiment of the invention is a three-phase generator comprising a 2Y two-winding structure, the transformer is a Y-Y-delta three-phase three-winding double-secondary-side multi-voltage-level output transformer, and the generator is tested through the connection of the first frequency converter, the second frequency converter, the generator and the transformer through the circuit diagram so as to detect whether the generator is qualified or not.
On one side of the first frequency converter is connected to a set of secondary sides Y of the transformer and on the other side of the first frequency converter is connected to a first winding of the generator. One side of the second frequency converter is connected with the other set of secondary side delta of the transformer, and the other side of the second frequency converter is connected with the second winding of the generator. Through the connection mode, the generator can be loaded to full power for power generation, and the torque of the two groups of windings of the generator is balanced in an opposite way. The first winding and the second winding of the generator, the two secondary sides of the transformer, the first frequency converter and the second frequency converter form an energy circulation system, and meanwhile, the power of the first frequency converter and the power of the second frequency converter only need to reach half of the power of the generator.
In a specific test process, a user can select a voltage level to be tested according to needs, for example: when the test voltage is 690V, the test voltage can be adjusted to 690V, 1140V and 3100V by changing the connection mode of the transformer, and when the test voltage is 690V, a first frequency converter and a second frequency converter with frequency converter parameters as first parameters are required. When 1140V is tested, a third frequency converter and a fourth frequency converter with the frequency converter parameters of the second parameter are adopted. When 3100V is tested, a fifth frequency converter and a sixth frequency converter with frequency converter parameters as third parameters are required.
It should be noted that the first parameter, the second parameter, and the third parameter are not consistent.
In the specific implementation process, the power of the first frequency converter and the power of the second frequency converter are half of the power of the generator, so that the frequency converters can be prevented from being damaged while the test effect is achieved, and the service lives of the first frequency converter and the second frequency converter are prolonged.
In the embodiment of the invention, the first end of the first frequency converter is connected with the first low-voltage end of the transformer; the second end of the first frequency converter is connected with a first winding of the generator; the first end of the second frequency converter is connected with the second low-voltage end of the transformer; the second end of the second frequency converter is connected with a second winding of the generator; the high-voltage end of the transformer is connected with the high-voltage power supply, so that the generator with different levels of voltage can be tested without adopting a plurality of generators, the full power of the generator can be added only through one generator and the transformer, the generator type test task is completed, meanwhile, the secondary side of the transformer can output the voltage with different levels, and the type test requirements of the voltage generators with different levels are met.
Example two
Referring to fig. 2, a circuit diagram of a generator testing system according to a second embodiment of the present invention is shown.
The generator test system provided by the embodiment of the invention comprises: a transformer 201, a first frequency converter 202, a second frequency converter 203 and a generator 204. The first end 2021 of the first frequency converter 202 is connected to the first low-voltage end 2011 of the transformer 201; the second end 2022 of the first frequency converter 202 is connected to the first winding 2041 of the generator 204; the first end 2031 of the second frequency converter 203 is connected to the second low voltage end 2012 of the transformer 201; a second end 2032 of the second frequency converter 203 is connected to a second winding 2042 of the generator 204; the high voltage terminal 2013 of the transformer 201 is connected to a high voltage power supply.
The first winding 2041 of the generator 204 includes a U1 end 20411, a V1 end 20412, and a W1 end 20413, and the second winding 2042 of the generator 204 includes a U2 end 20421, a V2 end 20422, and a W2 end 20423; the second end 2022 of the first frequency converter 202 is connected to the U1 end 20411, the V1 end 20412, and the W1 end 20413, respectively; the second end 2032 of the second frequency converter 203 is connected to the U2 end 20421, the V2 end 20422 and the W2 end 20423, respectively.
The transformer 201 is a three-phase transformer; the first low-voltage input end of the transformer is a Y-shaped secondary side; the second low-voltage input end of the transformer is a delta-shaped secondary side; the high voltage input of the transformer is the primary side of the Y-shape.
When the generator test system is in the working mode, the sum of the currents of the first winding of the generator and the second winding of the generator is the rated current of the generator. The power of the first frequency converter and the second frequency converter is greater than or equal to 1/2 of the power of the generator. The first frequency converter drives a first winding of the generator to start the generator to a half of the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator to complete synchronization of grid connection; the specific operation for completing synchronization of grid connection is as follows: when the first frequency converter drives the first winding of the generator, detecting the output of the generator, namely a synchronization process of grid connection, wherein the first frequency converter drives the first winding of the generator to start the generator to the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator to load the generator to full power, wherein the sum of the power of the first winding and the power of the second winding is the rated power of the generator. The torque of the first winding and the torque of the second winding of the generator are equal in magnitude and opposite in direction. In the generator test system, the required voltage grade can be selected, and the type test task of full power generation of the generator can be realized only by one generator and one transformer. Specifically, the method comprises the following steps: the connection mode of the transformer is selected so as to determine the tested voltage classes, the voltage classes comprise 690V, 1140V and 3100V, the high-voltage end of the Y-Y-delta three-phase transformer is connected with 10kV, the voltage class corresponding to the low-voltage end is selectable, the first low-voltage end and the second low-voltage end are respectively connected to the first frequency converter and the second frequency converter, and the voltage class is 690V, 1140V and 3100V. Starting a first frequency converter to drive a first winding of a generator, starting the generator to be half of the rated rotating speed, and driving a second winding of the generator by a second frequency converter to complete synchronization of grid connection; the first frequency converter drives a first winding of the generator to start the generator to the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator, the generator is loaded to full power, the sum of the currents of the two windings of the generator reaches the rated current value of the generator, and the sum of the powers of the two windings reaches the rated power value of the generator. This allows the generator to be loaded to full power generation. Two windings of the generator, two secondary sides of the transformer and two frequency converters form an energy circulation system. Through the circuit diagram, the generator is tested to detect whether the generator is qualified or not.
In the concrete implementation process, the power of the first frequency converter and the power of the second frequency converter are half of the power of the generator, so that the frequency converters can be prevented from being damaged while the test effect is achieved, and the service lives of the first frequency converter and the second frequency converter are prolonged.
It should be noted that the minimum power of the first frequency converter and the minimum power of the second frequency converter is half of the power of the generator, wherein the sum of the powers of the first frequency converter and the second frequency converter is greater than or equal to the power of the generator, so as to ensure that the generator is in a full power state.
In the embodiment of the invention, the first end of the first frequency converter is connected with the first low-voltage end of the transformer; the second end of the first frequency converter is connected with a first winding of the generator; the first end of the second frequency converter is connected with the second low-voltage end of the transformer; the second end of the second frequency converter is connected with a second winding of the generator; the high-voltage end of the transformer is connected with the high-voltage power supply, so that the generator with different levels of voltage can be tested without adopting a plurality of generators, the full power of the generator can be added only through one generator and the transformer, the generator type test task is completed, meanwhile, the secondary side of the transformer can output the voltage with different levels, and the type test requirements of the voltage generators with different levels are met.
EXAMPLE III
Referring to fig. 3, a flow chart of steps of a generator testing method according to a third embodiment of the present invention is shown.
The generator testing method provided by the embodiment of the invention comprises the following steps:
step 301: the first frequency converter drives a first winding of the generator to start the generator to half of the rated rotation speed of the generator.
The first end of the first frequency converter is connected with the first low-voltage end of the transformer, and the second end of the first frequency converter is connected with the first winding of the generator.
Step 302: and the second frequency converter drives a second winding of the generator to complete synchronization of grid connection.
The first end of the second frequency converter is connected with the second low-voltage end of the transformer, and the second end of the second frequency converter is connected with the second winding of the generator.
The specific operation for completing synchronization of grid connection is as follows: when the first frequency converter drives the first winding of the generator, the output of the generator is detected, namely the synchronization process of grid connection.
Step 303: the first frequency converter drives a first winding of the generator to start the generator to the rated speed of the generator.
Step 304: the second frequency converter drives a second winding of the generator, loading the generator to full power. The first frequency converter further drives the first winding of the generator and starts the generator to the rated speed of the generator, and the second frequency converter further loads the generator and loads the generator to full power.
Step 305: and detecting the state parameters of the generator to judge whether the generator is normal.
Wherein, the state parameter comprises any one of the following: temperature parameters and electrical parameters.
And comparing the current temperature of the generator with a preset temperature, determining that the generator fails in testing when the current temperature of the generator is greater than or equal to the preset temperature, and representing that the generator is unqualified, or indicating that the generator is unqualified when the electrical parameters of the generator are not more than the preset electrical performance condition.
And when the current temperature of the generator is lower than the preset temperature and/or the electrical parameters of the generator meet the preset electrical performance conditions, the generator is qualified.
The electrical parameter includes any one of the following: rated voltage, current, active power, reactive power, resistance, capacitance, inductance, conductance, insulation parameters, and the like, which are not specifically limited in the embodiments of the present invention.
In the embodiment of the invention, a first frequency converter drives a first winding of a generator to start the generator to half of the rated rotating speed of the generator, a second frequency converter drives a second winding of the generator to complete synchronization of grid connection, the first frequency converter drives the first winding of the generator to start the generator to the rated rotating speed of the generator; the second frequency converter drives a second winding of the generator to load the generator to full power; the state parameters of the generators are detected, whether the generators are normal or not is judged, the generators with different levels of voltage can be tested without adopting a plurality of generators, the full power of the generators can be added only through one generator and one transformer, the generator type test task is finished, meanwhile, the secondary side of the transformer can output the voltages with different levels, and the type test requirements of the generators with different levels of voltage are met.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The generator test system is characterized by comprising a transformer, a first frequency converter, a second frequency converter and a generator;
the first end of the first frequency converter is connected with the first low-voltage end of the transformer;
the second end of the first frequency converter is connected with a first winding of the generator;
the first end of the second frequency converter is connected with the second low-voltage end of the transformer;
the second end of the second frequency converter is connected with a second winding of the generator;
the high-voltage end of the transformer is connected with a high-voltage power supply, and the transformer is used for outputting different test voltages to the first low-voltage end and the second low-voltage end according to the connection mode of the transformer; wherein:
the transformer is a three-phase transformer, a first low-voltage end of the transformer is a Y-shaped secondary side, a second low-voltage end of the transformer is a delta-shaped secondary side, a high-voltage end of the transformer is a Y-shaped primary side, and the Y-shaped secondary side of the transformer, the first frequency converter, the generator, the second frequency converter and the delta-shaped secondary side of the transformer form an energy circulation system.
2. The generator testing system of claim 1, wherein the first winding of the generator includes a U1 terminal, a V1 terminal, and a W1 terminal, and the second winding of the generator includes a U2 terminal, a V2 terminal, and a W2 terminal;
the second end of the first frequency converter is respectively connected with the U1 end, the V1 end and the W1 end;
and the second end of the second frequency converter is respectively connected with the U2 end, the V2 end and the W2 end.
3. The generator test system of claim 1, wherein a sum of currents of the first winding of the generator and the second winding of the generator is a rated current of the generator when the generator test system is in an operating mode.
4. The generator testing system of claim 1, wherein the first frequency converter and the second frequency converter are greater than or equal to 1/2 of the generator power when the generator testing system is in an operating mode.
5. The generator testing system of claim 1, wherein the first frequency converter drives a first winding of the generator to start the generator to half of a rated speed of the generator;
the second frequency converter drives a second winding of the generator to complete synchronization of grid connection;
the first frequency converter drives a first winding of the generator to start the generator to the rated rotating speed of the generator;
the second frequency converter drives a second winding of the generator to load the generator to full power.
6. The generator testing system of claim 1, wherein the torques of the first and second windings of the generator are equal in magnitude and opposite in direction.
7. A generator testing method is applied to a generator testing system and is characterized in that the generator testing system comprises a transformer, a first frequency converter, a second frequency converter and a generator, the transformer is a three-phase transformer, a first low-voltage end of the transformer is a Y-shaped secondary side, a second low-voltage end of the transformer is a delta-shaped secondary side, so that a high-voltage end of the transformer is a Y-shaped primary side, the Y-shaped secondary side of the transformer, the first frequency converter, the generator, the second frequency converter and the delta-shaped secondary side of the transformer form an energy circulation system, and the transformer is used for outputting different testing voltages to the first low-voltage end and the second low-voltage end according to the connection mode of the transformer; the method comprises the following steps:
the first frequency converter drives a first winding of a generator to start the generator to a half of the rated rotating speed of the generator; the first end of the first frequency converter is connected with the first low-voltage end of the transformer, and the second end of the first frequency converter is connected with the first winding of the generator;
the second frequency converter drives a second winding of the generator, and drives the second winding of the generator to complete synchronization of grid connection; the first end of the second frequency converter is connected with the second low-voltage end of the transformer, and the second end of the second frequency converter is connected with the second winding of the generator;
the first frequency converter drives a first winding of the generator to start the generator to the rated rotating speed of the generator;
the second frequency converter drives a second winding of the generator to load the generator to full power; detecting a state parameter of the generator to determine whether the generator is normal, wherein,
the state parameter comprises any one of the following: temperature parameters and electrical parameters.
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