CN112881911B - Variable-speed double-fed motor testing device - Google Patents
Variable-speed double-fed motor testing device Download PDFInfo
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- CN112881911B CN112881911B CN202110111107.3A CN202110111107A CN112881911B CN 112881911 B CN112881911 B CN 112881911B CN 202110111107 A CN202110111107 A CN 202110111107A CN 112881911 B CN112881911 B CN 112881911B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
- G01R31/346—Testing of armature or field windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/007—Control circuits for doubly fed generators
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention relates to the field of variable-speed double-fed motor tests, in particular to a test device for a variable-speed double-fed motor, and more particularly relates to a test device suitable for researching technical performance indexes of the variable-speed double-fed motor, aiming at solving the problems that the test of the existing test device for the variable-speed double-fed motor is not comprehensive enough when in work and the test requirements for obtaining various technical parameters cannot be met, wherein a closed-loop test loop comprises a frequency converter switch, frequency conversion equipment, a dragging asynchronous machine switch, a dragging asynchronous machine, a variable-speed double-fed motor rotor switch, a matched converter front-end switch, an output main switch, an electric network and a test circuit; the parallel test section comprises a short-circuit switch, a grid-connected switch and a parallel test circuit, electric quantity sensors are arranged on the test circuit and the parallel test circuit, and various test researches such as bidirectional electric energy exchange, power generation operation, electric operation, rotating speed regulation, voltage regulation, power regulation and the like of the variable-speed double-fed motor and an external power supply can be carried out.
Description
Technical Field
The invention relates to the field of speed-variable double-fed motor tests, in particular to a test device for a speed-variable double-fed motor, and more particularly relates to a test device suitable for researching technical performance indexes of the speed-variable double-fed motor.
Background
The variable speed double-fed motor is a novel motor with rotor AC excitation, and is a key device in a seawater pumping and storing power station. The variable-speed double-fed motor runs bidirectionally and can be used as a generator to provide electric energy for a power grid; and can be used as a motor to drag a load to operate. The frequency of the alternating current electric quantity of the three-phase stator winding of the variable-speed double-fed motor is constant frequency 50Hz, and the frequency of the alternating current electric quantity of the three-phase rotor winding is low frequency 0 ～ And 5Hz, and the stator winding and the rotor winding are in electric energy exchange with an external power supply. The rotating speed of the variable-speed double-fed motor can be adjusted, and the adjusting range is generally +/-10% of rated rotating speed.
Electromagnetic parameters, operation mechanism, regulation mode and control strategy of the variable-speed double-fed motor are hot spots of the current technical research. The existing test device of the variable-speed double-fed motor is not comprehensive enough for the test of the variable-speed double-fed motor, and can not meet the test requirement of obtaining various parameters.
Disclosure of Invention
The invention discloses the following purposes: the invention provides a test device of a variable-speed double-fed motor, aiming at solving the problems that the test of the existing test device of the variable-speed double-fed motor is not comprehensive enough and the test requirement for obtaining various technical parameters cannot be met.
The purpose of the invention is realized as follows: a test device of a variable-speed double-fed motor comprises a closed-loop test loop and a parallel test section;
the closed loop test circuit comprises a frequency converter switch, frequency conversion equipment, a dragging asynchronous machine switch, a dragging asynchronous machine, a variable-speed double-fed motor rotor switch, a matched converter front-end switch, an output main switch, a power grid and a test circuit;
the power grid is connected with a test circuit in parallel, the test circuit is connected with the power grid through a point B and a point C, a frequency converter switch, frequency conversion equipment, a dragging asynchronous machine switch, a dragging asynchronous machine, a variable-speed double-fed motor rotor switch, a matched converter front end switch and an output main switch are sequentially connected in series on the test circuit, the frequency converter switch is arranged at one end close to the point B, and the output main switch is arranged at one end close to the point C;
temperature sensors are arranged at the frequency conversion equipment, the dragging asynchronous machine, the variable-speed double-fed motor and the matched converter;
the parallel test section comprises a short-circuit switch, a grid-connected switch and a parallel test circuit, wherein a point A is arranged on the test circuit at a position between a front-end switch and an output main switch of the matched converter, one end of the parallel test circuit is connected with the variable-speed double-fed motor, the other end of one end of the parallel test circuit is connected with the point A, the short-circuit switch and the grid-connected switch are both arranged on the parallel test circuit, and the grid-connected switch is arranged on one side close to the point A;
and the test circuit and the parallel test circuit are both provided with electric quantity sensors.
Furthermore, one end of the dragging asynchronous machine is provided with a front end bearing of the dragging asynchronous machine, the other end of the dragging asynchronous machine drags a rear end bearing of the asynchronous machine, the rear end bearing of the dragging asynchronous machine is arranged at one side close to the variable-speed double-fed motor,
one end of the variable-speed double-fed motor is provided with a variable-speed double-fed motor front end bearing, the other end of the variable-speed double-fed motor is provided with a variable-speed double-fed motor rear end bearing, and the variable-speed double-fed motor front end bearing is arranged on one side close to the dragging asynchronous machine.
And further, the dragging asynchronous machine is connected with the variable-speed double-fed motor through a coupler.
Furthermore, a velocimeter is arranged on the variable-speed double-fed motor.
Furthermore, the temperature sensor comprises a frequency conversion equipment temperature sensor, a dragging asynchronous machine temperature sensor, a variable-speed double-fed motor temperature sensor and a matched converter temperature sensor;
the temperature sensor of the frequency conversion equipment is arranged on the frequency conversion equipment, the temperature sensor of the dragging asynchronous machine is arranged on the dragging asynchronous machine, the temperature sensor of the variable-speed double-fed motor is arranged on the variable-speed double-fed motor, and the temperature sensor of the matched converter is arranged on the matched converter.
Furthermore, the electric quantity sensor comprises a frequency converter electric quantity sensor, a dragging asynchronous machine electric quantity sensor, a variable-speed double-fed motor stator electric quantity sensor, a grid-connected electric quantity sensor, a variable-speed double-fed motor rotor electric quantity sensor, a matching converter front-end electric quantity sensor and a total electric quantity sensor;
the frequency converter electric quantity sensor is arranged between a frequency converter switch and frequency conversion equipment, the dragging asynchronous machine electric quantity sensor is arranged between a dragging asynchronous machine switch and a dragging asynchronous machine, the variable-speed double-fed motor stator electric quantity sensor is arranged between a variable-speed double-fed motor and a short-circuit switch, the grid-connected electric quantity sensor is arranged between the short-circuit switch and the grid-connected switch, the variable-speed double-fed motor rotor electric quantity sensor is arranged between the variable-speed double-fed motor and the variable-speed double-fed motor rotor switch, the matched converter front-end electric quantity sensor is arranged between the matched converter and the matched converter front-end switch, and the total electric quantity sensor is arranged between an output main switch and an A point.
Has the advantages that:
1. a test device of a variable-speed double-fed motor can realize that the variable-speed double-fed motor can operate as a generator: the variable-speed double-fed motor is excited by a matched converter to adjust the voltage and the frequency of a stator of the variable-speed double-fed motor, and the variable-speed double-fed motor is connected to the grid through a grid-connected switch to generate power to a power grid;
2. a test device of a variable-speed double-fed motor can realize that the variable-speed double-fed motor operates as a motor: starting a variable-speed double-fed motor by a matched converter, driving a dragging asynchronous machine by the variable-speed double-fed motor, and transmitting energy to a power grid by the dragging asynchronous machine through frequency conversion equipment;
3. a test device of a variable-speed double-fed motor forms a double closed loop; the stator winding, the rotor winding and the matched converter of the variable-speed double-fed motor are converged together in a circuit to form a closed loop, and partial stator electric quantity and rotor electric quantity of the variable-speed double-fed motor flow in the closed loop, so that the influence of the variable-speed double-fed motor on other equipment is reduced; from the power grid, the energy passes through the frequency conversion equipment, the dragging asynchronous machine, the variable-speed double-fed motor and the matched converter and reaches the power grid to form a second closed loop, most of the energy of the test device flows in the second closed loop, and the influence of the test device on the power grid is reduced;
4. a test device for a variable-speed double-fed motor can perform various experimental researches such as bidirectional electric energy exchange, power generation operation, electric operation, rotating speed regulation, voltage regulation, power regulation and the like of the variable-speed double-fed motor and an external power supply.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram of a test device for a variable speed doubly-fed machine
Reference numbers indicate parts in the drawings:
1. a frequency converter switch; 2. a transducer power sensor; 3. frequency conversion equipment; 4. a frequency conversion device temperature sensor; 5. dragging an asynchronous machine switch; 6. dragging the asynchronous machine electric quantity sensor; 7. dragging a front end bearing of the asynchronous machine; 8. dragging the asynchronous machine; 9. dragging the asynchronous machine temperature sensor; 10. dragging a rear end bearing of the asynchronous machine; 11. a coupling; 12. a variable speed double-fed motor front end bearing; 13. a variable speed doubly-fed machine; 14. a variable speed doubly-fed motor temperature sensor; 15. a velocimeter; 16. a variable speed double-fed motor rear end bearing; 17. a variable speed double-fed motor stator electric quantity sensor; 18. a short-circuit switch; 19. a grid-connected electric quantity sensor; 20. a grid-connected switch; 21. a variable speed double-fed motor rotor electric quantity sensor; 22. a variable speed double-fed motor rotor switch; 23. a temperature sensor of the converter is matched; 24. a matched current transformer; 25. a matched converter front-end electric quantity sensor; 26. a matched converter front-end switch; 27. an output master switch; 28. a total charge sensor; 29. and (4) a power grid.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The first embodiment is as follows: a test device of a variable-speed double-fed motor comprises a closed-loop test loop and a parallel test section;
the closed loop test circuit comprises a frequency converter switch 1, frequency conversion equipment 3, a dragging asynchronous machine switch 5, a dragging asynchronous machine 8, a variable-speed double-fed motor 13, a variable-speed double-fed motor rotor switch 22, a matched converter 24, a matched converter front-end switch 26, an output main switch 27, a power grid 29 and a test circuit;
the power grid 29 is connected with a test circuit in parallel, the test circuit is connected into the power grid 29 through a point B and a point C, a frequency converter switch 1, a frequency conversion device 3, a dragging asynchronous machine switch 5, a dragging asynchronous machine 8, a variable-speed double-fed motor 13, a variable-speed double-fed motor rotor switch 22, a matched converter 24, a matched converter front-end switch 26 and an output main switch 27 are sequentially connected in series on the test circuit, the frequency converter switch 1 is arranged at one end close to the point B, and the output main switch 27 is arranged at one end close to the point C;
temperature sensors are arranged at the frequency conversion equipment 3, the dragging asynchronous machine 8, the variable-speed double-fed motor 13 and the matched converter 24;
the parallel test section comprises a short-circuit switch 18, a grid-connected switch 20 and a parallel test circuit, a point A is arranged on the test circuit at a position between a front-end switch 26 and an output main switch 27 of the matched converter, one end of the parallel test circuit is connected with the variable-speed double-fed motor 13, the other end of one end of the parallel test circuit is connected with the point A, the short-circuit switch 18 and the grid-connected switch 20 are both arranged on the parallel test circuit, and the grid-connected switch 20 is arranged on one side close to the point A;
and the test circuit and the parallel test circuit are both provided with electric quantity sensors.
In the present embodiment: the variable-speed double-fed motor is a tested machine, and can be used as a test object, namely a variable-speed double-fed motor, and can be used as a generator to provide electric energy for a power grid; but also can be used as a motor to drag a load to operate; the frequency of the alternating current electric quantity of the three-phase stator winding is constant frequency 50Hz, and the frequency of the alternating current electric quantity of the three-phase rotor winding is low frequency 0 ～ 5 Hz; the variable-speed double-fed motor can run in forward and reverse directions and at variable rotating speed, and the rotating speed variation range is +/-10% of rated rotating speed. The matching converter is used as matching equipment of the variable-speed double-fed motor, is an excitation power supply of the variable-speed double-fed motor and provides three-phase low-frequency 0 for the excitation power supply ～ The 5Hz alternating current excitation is carried out, and a matched converter can complete the voltage regulation, the active power regulation, the reactive power regulation and the variable speed regulation of the variable-speed double-fed motor and has the function of grid-connected control; the frequency conversion equipment operates in four quadrants, and is used as a power supply for dragging the asynchronous machine and also as equipment for dragging the asynchronous machine electric energy feedback power grid; the dragging asynchronous machine is coaxially connected with the variable-speed double-fed motor through a coupler, and mechanical power is transmitted between the dragging asynchronous machine and the variable-speed double-fed motor; the capacity of the frequency conversion equipment and the capacity of the dragging asynchronous machine are matched with the capacity of the variable-speed double-fed motor.
The frequency converter switch, the dragging asynchronous machine switch, the variable-speed double-fed motor rotor switch, the matched converter front-end switch and the output main switch are used as the circuit switching-on and switching-off of each circuit; when the variable-speed double-fed motor is used as a motor, a short-circuit switch is needed to short-circuit a stator winding of the variable-speed double-fed motor in the starting process; when the variable-speed double-fed motor is used as a generator, the grid-connected switch enables the stator output of the variable-speed double-fed motor to be connected with a power grid; each set of control switch of the test device consists of a knife switch and a breaker, wherein the knife switch has the function of enabling a circuit to have an obvious breakpoint, and the breaker has the function of closing or breaking the circuit in an electrified way.
The power grid is a carrier of the energy source and the electric energy output of the whole test device.
The second embodiment is as follows: one end of the dragging asynchronous machine 8 is provided with a dragging asynchronous machine front end bearing 7, the other end of the dragging asynchronous machine 8 drags an asynchronous machine rear end bearing 10, the dragging asynchronous machine rear end bearing 10 is arranged at one side close to a variable speed double-fed motor 13,
one end of the variable-speed double-fed motor 13 is provided with a variable-speed double-fed motor front end bearing 12, the other end of the variable-speed double-fed motor 13 is provided with a variable-speed double-fed motor rear end bearing 16, and the variable-speed double-fed motor front end bearing 12 is arranged on one side close to the dragging asynchronous machine 8.
In the present embodiment: the front end bearing of the dragging asynchronous machine, the rear end bearing of the dragging asynchronous machine, the front end bearing of the variable-speed double-fed motor and the rear end bearing of the variable-speed double-fed motor, which support the rotating motor rotor; the bearings are equipped with vibration sensors and temperature sensors to ensure safe operation of the rotating equipment.
Other embodiments are the same as the first embodiment.
The third concrete implementation mode: the dragging asynchronous machine 8 is connected with a variable-speed double-fed motor 13 through a coupler 11.
In the present embodiment: the driving asynchronous machine and the variable-speed double-fed motor are coaxially connected through the coupler, and mechanical power is transmitted between the driving asynchronous machine and the variable-speed double-fed motor.
Other embodiments are the same as the first embodiment.
The fourth concrete implementation mode is as follows: and a velocimeter 15 is arranged on the variable speed double-fed motor 13.
In the present embodiment: the tachometer provides the rotating speed and the rotor position angle of the variable-speed double-fed motor to the matched converter so as to carry out various functional operation control.
Other embodiments are the same as the first embodiment.
The fifth concrete implementation mode: the temperature sensors comprise a frequency conversion equipment temperature sensor 4, a dragging asynchronous machine temperature sensor 9, a variable-speed double-fed motor temperature sensor 14 and a matched converter temperature sensor 23;
the frequency conversion equipment temperature sensor 4 is arranged on the frequency conversion equipment 3, the dragging asynchronous machine temperature sensor 9 is arranged on the dragging asynchronous machine 8, the variable-speed double-fed motor temperature sensor 14 is arranged on the variable-speed double-fed motor 13, and the matched converter temperature sensor 23 is arranged on the matched converter 24.
In the present embodiment: the temperature sensors are used for monitoring the temperature of the equipment during operation.
Other embodiments are the same as the first embodiment.
The sixth specific implementation mode is as follows: the electric quantity sensors comprise a frequency converter electric quantity sensor 2, a dragging asynchronous machine electric quantity sensor 6, a variable-speed double-fed motor stator electric quantity sensor 17, a grid-connected electric quantity sensor 19, a variable-speed double-fed motor rotor electric quantity sensor 21, a matching converter front-end electric quantity sensor 25 and a total electric quantity sensor 28;
the frequency converter electric quantity sensor 2 is arranged between a frequency converter switch 1 and a frequency conversion device 3, the dragging asynchronous machine electric quantity sensor 6 is arranged between a dragging asynchronous machine switch 5 and a dragging asynchronous machine 8, the variable-speed double-fed motor stator electric quantity sensor 17 is arranged between a variable-speed double-fed motor 13 and a short-circuit switch 18, a grid-connected electric quantity sensor 19 is arranged between the short-circuit switch 18 and a grid-connected switch 20, a variable-speed double-fed motor rotor electric quantity sensor 21 is arranged between the variable-speed double-fed motor 13 and a variable-speed double-fed motor rotor switch 22, a matched converter front end electric quantity sensor 25 is arranged between a matched converter 24 and a matched converter front end switch 26, and a total electric quantity sensor 28 is arranged between an output main switch 27 and an A point.
In the present embodiment: the method comprises the following steps that a frequency converter electric quantity sensor, a dragging asynchronous machine electric quantity sensor, a variable-speed double-fed motor stator electric quantity sensor, a grid-connected electric quantity sensor, a variable-speed double-fed motor rotor electric quantity sensor, a matching converter front-end electric quantity sensor and a total electric quantity sensor are used as electric quantity measurement of each line; each set of electric quantity sensor comprises a current sensor and a voltage sensor, the current sensor tests the line current, the voltage sensor tests the line voltage, and each set of electric quantity sensor can also test the electric quantity frequency, the waveform, the active power and the reactive power; wherein the power difference between the electric quantity sensor of the frequency converter and the total electric quantity sensor is the energy consumption of the system device; the difference of the power tested by the rotor electric quantity sensor of the variable-speed double-fed motor and the front end electric quantity sensor of the matched converter is the energy consumption of the matched converter.
Other embodiments are the same as the first embodiment.
The working principle is as follows:
a test device of a variable-speed double-fed motor comprises main equipment, a bearing, a control switch, an electric quantity sensor, a temperature sensor, auxiliary equipment and a power grid; the main device has: the system comprises frequency conversion equipment, a dragging asynchronous machine, a variable-speed double-fed motor and a matched converter; the bearing has: the front end bearing of the dragging asynchronous machine, the rear end bearing of the dragging asynchronous machine, the front end bearing of the variable-speed double-fed motor and the rear end bearing of the variable-speed double-fed motor; the control switch has: the system comprises a frequency converter switch, a dragging asynchronous machine switch, a variable-speed double-fed motor rotor switch, a matched converter front-end switch, a short-circuit switch, a grid-connected switch and an output main switch; the electric quantity sensor has: the system comprises a frequency converter electric quantity sensor, a dragging asynchronous machine electric quantity sensor, a variable-speed double-fed motor stator electric quantity sensor, a grid-connected electric quantity sensor, a variable-speed double-fed motor rotor electric quantity sensor, a matching converter front-end electric quantity sensor and a total electric quantity sensor; the temperature sensor has: the system comprises a frequency conversion equipment temperature sensor, a dragging asynchronous machine temperature sensor, a variable-speed double-fed motor temperature sensor and a matched converter temperature sensor; the auxiliary device is provided with: a coupler and a velocimeter; the test device also comprises a power grid;
a variable-speed double-fed motor in main equipment of a test device of the variable-speed double-fed motor is a tested machine, and the variable-speed double-fed motor serving as a test object can serve as a generator to provide electric energy for a power grid; but also can be used as a motor to drag a load to operate; the frequency of the alternating current electric quantity of the three-phase stator winding is constant frequency 50Hz, and the frequency of the alternating current electric quantity of the three-phase rotor winding is low frequency 0 ～ 5 Hz; the variable-speed double-fed motor can run in forward and reverse directions and at variable rotating speed, and the rotating speed variation range is +/-10% of rated rotating speed. The matching converter is used as matching equipment of the variable-speed double-fed motor, is an excitation power supply of the variable-speed double-fed motor and provides three-phase low-frequency 0 for the excitation power supply ～ The 5Hz alternating current excitation is carried out, and a matched converter can complete the voltage regulation, the active power regulation, the reactive power regulation and the variable speed regulation of the variable-speed double-fed motor and has the function of grid-connected control; frequency conversion equipmentThe device is operated in four quadrants, and not only serves as a power supply for dragging the asynchronous machine, but also serves as a device for dragging the asynchronous machine electric energy feedback power grid; the dragging asynchronous machine is coaxially connected with the variable-speed double-fed motor through a coupler, and mechanical power is transmitted between the dragging asynchronous machine and the variable-speed double-fed motor; the capacity of the frequency conversion equipment and the capacity of the dragging asynchronous machine are matched with the capacity of the variable-speed double-fed motor;
a bearing of a test device of a variable-speed double-fed motor comprises: the front end bearing of the dragging asynchronous machine, the rear end bearing of the dragging asynchronous machine, the front end bearing of the variable-speed double-fed motor and the rear end bearing of the variable-speed double-fed motor, which support the rotating motor rotor; the bearing is provided with a vibration sensor and a temperature sensor to ensure the safe operation of the rotating equipment;
a control switch of a test device of a variable-speed double-fed motor comprises: the frequency converter switch, the dragging asynchronous machine switch, the variable-speed double-fed motor rotor switch, the matched converter front-end switch and the output main switch are used as the circuit switching-on and switching-off of each circuit; when the variable-speed double-fed motor is used as a motor, a short-circuit switch is required to short-circuit a stator winding of the variable-speed double-fed motor in the starting process; when the variable-speed double-fed motor is used as a generator, the grid-connected switch enables the stator output of the variable-speed double-fed motor to be connected with a power grid; each set of control switch of the test device consists of a knife switch and a breaker, wherein the knife switch has the function of enabling a circuit to have an obvious breakpoint, and the breaker has the function of closing or breaking the circuit in an electrified way;
an electric quantity sensor of a test device of a variable-speed double-fed motor comprises: the method comprises the following steps that a frequency converter electric quantity sensor, a dragging asynchronous machine electric quantity sensor, a variable-speed double-fed motor stator electric quantity sensor, a grid-connected electric quantity sensor, a variable-speed double-fed motor rotor electric quantity sensor, a matching converter front-end electric quantity sensor and a total electric quantity sensor are used as electric quantity measurement of each line; each set of electric quantity sensor comprises a current sensor and a voltage sensor, the current sensor tests the line current, the voltage sensor tests the line voltage, and each set of electric quantity sensor can also test the electric quantity frequency, the waveform, the active power and the reactive power; wherein the power difference between the transducer power sensor and the total power sensor is the energy consumption of the system device; the difference of the power tested by the rotor electric quantity sensor of the variable-speed double-fed motor and the front end electric quantity sensor of the matched converter is the energy consumption of the matched converter;
a temperature sensor of a test device of a variable-speed double-fed motor comprises: the system comprises a frequency conversion equipment temperature sensor, a dragging asynchronous machine temperature sensor, a variable-speed double-fed motor temperature sensor and a matched converter temperature sensor, wherein the temperature sensors monitor the temperature of respective equipment during operation;
an auxiliary equipment coupling of a test device of a variable-speed double-fed motor enables a dragging asynchronous machine and the variable-speed double-fed motor to be coaxially connected, and mechanical power is transmitted between the dragging asynchronous machine and the variable-speed double-fed motor; the velocimeter provides the rotating speed and the rotor position angle of the variable-speed double-fed motor for the matched converter so as to carry out various functional operation control;
the power grid of the variable-speed double-fed motor testing device is a carrier of an energy source and electric energy output of the whole testing device.
The utility model provides a variable speed doubly-fed machine's test device, can realize variable speed doubly-fed machine and regard as generator operation: the variable-speed double-fed motor is excited by a matched converter to adjust the voltage and the frequency of a stator of the variable-speed double-fed motor, and the variable-speed double-fed motor is connected to the grid through a grid-connected switch to generate power to a power grid;
a test device of a variable-speed double-fed motor can realize that the variable-speed double-fed motor operates as a motor: starting a variable-speed double-fed motor by a matched converter, driving a dragging asynchronous machine by the variable-speed double-fed motor, and transmitting energy to a power grid by the dragging asynchronous machine through frequency conversion equipment;
a test device of a variable-speed double-fed motor forms a double closed loop; the stator winding, the rotor winding and the matched converter of the variable-speed double-fed motor are converged at a line A point in the figure to form an I closed loop, and partial stator electric quantity and rotor electric quantity of the variable-speed double-fed motor flow in the I closed loop, so that the influence of the variable-speed double-fed motor on other equipment is reduced; starting from the point B of the power grid in the figure, the energy reaches the point C of the power grid through the frequency conversion equipment, the dragging asynchronous machine, the variable-speed double-fed motor and the matched converter to form a closed loop II, most of the energy of the test device flows in the closed loop II, and the influence of the test device on the power grid is reduced.
The above description is only for the preferred 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. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a variable speed doubly-fed machine's test device which characterized in that: the device comprises a closed loop test circuit and a parallel test section;
the closed-loop test circuit comprises a frequency converter switch (1), frequency conversion equipment (3), a dragging asynchronous machine switch (5), a dragging asynchronous machine (8), a variable-speed double-fed motor (13), a variable-speed double-fed motor rotor switch (22), a matched converter (24), a matched converter front-end switch (26), an output main switch (27), an electric network (29) and a test circuit;
the power grid (29) is connected with a test circuit in parallel, the test circuit is connected into the power grid (29) through a point B and a point C, a frequency converter switch (1), frequency conversion equipment (3), a dragging asynchronous machine switch (5), a dragging asynchronous machine (8), a variable-speed double-fed motor (13), a variable-speed double-fed motor rotor switch (22), a matched converter (24), a matched converter front-end switch (26) and an output main switch (27) are sequentially connected in series on the test circuit, the frequency converter switch (1) is arranged at one end close to the point B, and the output main switch (27) is arranged at one end close to the point C;
temperature sensors are arranged at the frequency conversion equipment (3), the dragging asynchronous machine (8), the variable-speed double-fed motor (13) and the matched converter (24);
the parallel test section comprises a short-circuit switch (18), a grid-connected switch (20) and a parallel test circuit, a point A is arranged on the test circuit at a position between a front-end switch (26) of the matched converter and an output main switch (27), one end of the parallel test circuit is connected with the variable-speed double-fed motor (13), the other end of one end of the parallel test circuit is connected with the point A, the short-circuit switch (18) and the grid-connected switch (20) are both arranged on the parallel test circuit, and the grid-connected switch (20) is arranged on one side close to the point A;
and the test circuit and the parallel test circuit are both provided with electric quantity sensors.
2. The testing device of the variable-speed doubly-fed machine according to claim 1, characterized in that: one end of the dragging asynchronous machine (8) is provided with a dragging asynchronous machine front end bearing (7), the other end of the dragging asynchronous machine (8) drags an asynchronous machine rear end bearing (10), the dragging asynchronous machine rear end bearing (10) is arranged at one side close to the variable-speed double-fed motor (13),
one end of the variable-speed double-fed motor (13) is provided with a variable-speed double-fed motor front end bearing (12), the other end of the variable-speed double-fed motor (13) is provided with a variable-speed double-fed motor rear end bearing (16), and the variable-speed double-fed motor front end bearing (12) is arranged on one side close to the dragging asynchronous machine (8).
3. The testing device of the variable-speed doubly-fed machine according to claim 1, characterized in that: the dragging asynchronous machine (8) is connected with the variable-speed double-fed motor (13) through a coupler (11).
4. The testing device of the variable-speed doubly-fed machine according to claim 1, characterized in that: and a velocimeter (15) is arranged on the variable speed double-fed motor (13).
5. The testing device of the variable-speed doubly-fed machine according to claim 1, characterized in that: the temperature sensors comprise a frequency conversion equipment temperature sensor (4), a dragging asynchronous machine temperature sensor (9), a variable-speed double-fed motor temperature sensor (14) and a matched converter temperature sensor (23);
the frequency conversion equipment temperature sensor (4) is arranged on the frequency conversion equipment (3), the dragging asynchronous machine temperature sensor (9) is arranged on the dragging asynchronous machine (8), the variable-speed double-fed motor temperature sensor (14) is arranged on the variable-speed double-fed motor (13), and the matched converter temperature sensor (23) is arranged on the matched converter (24).
6. The testing device of the variable-speed doubly-fed machine according to claim 1, characterized in that: the electric quantity sensor comprises a frequency converter electric quantity sensor (2), a dragging asynchronous machine electric quantity sensor (6), a variable-speed double-fed motor stator electric quantity sensor (17), a grid-connected electric quantity sensor (19), a variable-speed double-fed motor rotor electric quantity sensor (21), a matching converter front-end electric quantity sensor (25) and a total electric quantity sensor (28);
the frequency converter electric quantity sensor (2) is arranged between the frequency converter switch (1) and the frequency conversion equipment (3), the electric quantity sensor (6) of the dragging asynchronous machine is arranged between the switch (5) of the dragging asynchronous machine and the dragging asynchronous machine (8), the variable-speed doubly-fed motor stator electric quantity sensor (17) is arranged between the variable-speed doubly-fed motor (13) and the short-circuit switch (18), the grid-connected electric quantity sensor (19) is arranged between the short-circuit switch (18) and the grid-connected switch (20), the variable-speed doubly-fed motor rotor electricity quantity sensor (21) is arranged between the variable-speed doubly-fed motor (13) and a variable-speed doubly-fed motor rotor switch (22), the matching converter front-end electricity quantity sensor (25) is arranged between the matching converter (24) and a matching converter front-end switch (26), and the total electricity quantity sensor (28) is arranged between an output main switch (27) and an A point.
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