CN102447265A - Loading device and method for power unit with feedback function - Google Patents

Loading device and method for power unit with feedback function Download PDF

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Publication number
CN102447265A
CN102447265A CN2010105041550A CN201010504155A CN102447265A CN 102447265 A CN102447265 A CN 102447265A CN 2010105041550 A CN2010105041550 A CN 2010105041550A CN 201010504155 A CN201010504155 A CN 201010504155A CN 102447265 A CN102447265 A CN 102447265A
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Prior art keywords
motor
feedback function
frequency converter
power cell
taking back
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CN2010105041550A
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CN102447265B (en
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董瑞勇
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Shenzhen Invt Electric Co Ltd
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Shenzhen Invt Electric Co Ltd
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Abstract

The invention relates to a loading device and a loading method for a power unit with a feedback function. The loading device comprises a first frequency converter, a second frequency converter, a first electric motor, a second electric motor and an inductive load. A set of electric motor pair trawling unit consists of the first electric motor and the second motor. The first electric motor and the second electric motor are respectively driven by the first frequency converter and the second frequency converter. A direct current bus of the second frequency converter is connected in parallel with a direct current bus of the power unit with the feedback function to form a common direct current bus. Output frequencies of the frequency converters are set, so that the output frequency of the second frequency converter is lower than that of the first frequency converter; the second electric motor operates in a generating state and electric energy generated by the second electric motor is fed back to a power grid through a controllable rectification part of the power unit with the feedback function, so that the controllable rectification part of the power unit with the feedback function is loaded. The loading device and the loading method have the advantages that the simultaneous full-load operation of the controllable rectification part and an inverter part of the power unit with the feedback function is realized under the condition of low electric energy consumption; and not only the energy is saved, but also the load experiment aim that the complete power unit with the full load operates can be fulfilled.

Description

Take back the charger and the method for feedback function power cell
Technical field
The present invention relates to electronic technology field, particularly four-quadrant high voltage converter technology.
Background technology
Be that the research and development of the high pressure four-quadrant frequency converter of basic structure are debugged, tested, dispatch from the factory each stage of debugging to take back feedback function power unit cascade mode; Often need power cell that take back the feedback function be loaded separately, so that this power cell carried out device temperature rise test, load capacity test under the nominal working conditions etc.General load mode has two kinds, and a kind of is to the charged sense load of power cell, and this mode can realize the full-load run of the inversion part of power cell, but the electric current that the power cell rectifying part flows through is very little, the working condition when failing to simulate specified input.Another kind of mode is to the load of power cell strip resistance, and this mode can realize the full-load run operating mode of power cell complete machine, but the electric energy that consumes is very big.
Summary of the invention
The objective of the invention is deficiency to above prior art; Design a kind of loading method of taking back feedback function power cell of giving; Through a cover motor to dragging unit and inductive load, the controlled rectification that can realize taking back feedback function power cell partly and inversion partly be with full-load run simultaneously, the working condition in the time of simulating specified input; Carry out load capacity test, temperature rise test etc.; And compare the load mode of the charged resistive load of power cell, this device is very little to the consumption of energy, the loss that produces on loss that produces when having only own loss, the motor power conversion of frequency converter and the inductive load.
The object of the invention realizes that through following technology a kind of charger of taking back the power cell of feedback function comprises:
The inductive load that first frequency converter, second frequency converter, first motor, second motor and being used for loads to the power cell of taking back the feedback function;
Wherein, first motor and second motor are formed a cover motor to dragging unit, and first motor and second motor are driven by first frequency converter, second frequency converter respectively, and running in the same way; The dc bus of second frequency converter composes in parallel common DC bus with the dc bus of taking back the power cell of feedback function;
The output frequency of setting second frequency converter is lower than first frequency converter; Make second motor operate in generating state; Its electric energy that sends partly feeds back to electrical network via the controlled rectification of the power cell of taking back the feedback function, realizes the controlled rectification loading partly to the power cell of taking back the feedback function; Inductive load partly joins with the inversion of taking back the power cell of feedback function, and the inversion of the power cell of taking back the feedback function is partly loaded.
The described charger of taking back the power cell of feedback function, its first motor and second motor are AC asynchronous motor.
The described charger of taking back the power cell of feedback function, its first motor and second motor are formed a cover motor to dragging the realization of unit, are to realize through the hard mode that connects of shaft coupling through the power transmission shaft of first motor and second motor.
A kind of loading method of taking back the power cell of feedback function comprises:
First motor and second motor are formed a cover motor to dragging unit, drive first motor and second motor with first frequency converter, second frequency converter respectively, first motor and second motor are turned round in the same way;
The dc bus of second frequency converter is composed in parallel common DC bus with the dc bus of taking back the power cell of feedback function;
Set the frequency converter output frequency; Make the output frequency of second frequency converter be lower than first frequency converter; Make second motor operate in generating state; Its electric energy that sends partly feeds back to electrical network via the controlled rectification of the power cell of taking back the feedback function, realizes the controlled rectification loading partly to the power cell of taking back the feedback function;
The inversion part of taking back the power cell of feedback function then loads through inductive load.
The described loading method of taking back feedback function power cell, it flows through the size of current of controlled rectification part, can regulate through the difference on the frequency of adjusting first frequency converter and second frequency converter; Difference on the frequency more greatly then electric current is big more, otherwise then electric current is more little.
The described loading method of taking back feedback function power cell; It flows through the size of current of controlled rectification part; Can regulate the size of current that flows through the controlled rectification part through the torque limiting parameter of setting first frequency converter, the torque upper limit of setting more greatly then electric current is big more, otherwise then electric current is more little.
The described loading method of taking back feedback function power cell, it comprises first motor and second motor composition, one cover motor to dragging unit: the power transmission shaft of first motor and second motor is connect through shaft coupling firmly.
Can be connected a reactor between the described loading method of taking back the power cell of feedback function, its power cell of taking back the feedback function and electrical network, to play a hindrance function.
Technological merit of the present invention is, with power consumption seldom, realizes controlled rectification part and the inversion part of taking back feedback function power cell are with full-load run simultaneously; Not only the energy savings but also the band that can reach the full-load run of power cell complete machine carried experiment purpose.
Description of drawings
Fig. 1 is an electrical equipment principle schematic of the present invention.
Embodiment
It is a kind of to taking back the apparatus and method that feedback function power cell loads that the embodiment of the invention provides; Design one cover motor makes one of them motor be in generating state to dragging unit; The dc bus of the dc bus of the frequency converter that drives the generating state motor and the power cell of band power back off function is composed in parallel common DC bus; Make the electric energy that motor sent be in Discovery Status partly feed back to electrical network, realize controlled rectification loading partly the power cell of taking back the feedback function via the controlled rectification of the power cell of taking back feedback function; The inversion part of taking back the power cell of feedback function then loads through inductive load; The ability realization is taken back the controlled rectification part and the inversion part of feedback function power cell and is with full-load run simultaneously; Working condition when simulating specified input is carried out load capacity test, temperature rise test etc.To combine Fig. 1 that the embodiment of the invention is elaborated below.
As shown in Figure 1; First motor and second motor are selected AC asynchronous motor; The power transmission shaft of first motor 3 and second motor 4 is formed a cover motor to dragging unit through the hard modes that connect of shaft coupling 7, drives first motor 3, second motor 4 with first frequency converter 1 and second frequency converter 2 respectively.The dc bus of second frequency converter 2 composes in parallel common DC bus 8 with the dc bus of taking back the power cell 5 of feedback function.Two motors turns round in the same way; Set the frequency converter output frequency, the output frequency that makes second frequency converter 2 lets second motor 4 operate in generating state a little less than first frequency converter 1; Its electric energy that sends is via second frequency converter 2, common DC bus 8; Be sent to the power cell 5 of taking back the feedback function, the controlled rectification by the power cell of taking back the feedback function 5 partly feeds back to electrical network again, realizes the controlled rectification loading partly to the power cell 5 of taking back the feedback function.When loading test, can be connected a reactor 9, a hindrance function between the said power cell 5 of taking back feedback function and the electrical network.Flow through the size of current of controlled rectification part, can through adjust two frequency converters promptly the difference on the frequency of first frequency converter and second frequency converter regulate, difference on the frequency more greatly then electric current is big more, on the contrary then electric current is more little.Or can regulate the size of current that flows through the controlled rectification part through the torque limiting parameter of setting first frequency converter 1, and the torque upper limit of setting more greatly then electric current is big more, on the contrary then electric current is more little.
The inversion part of taking back the power cell 5 of feedback function loads through charged sense load 6.Output frequency and output voltage that the power cell 5 of feedback function is taken back in adjustment can change the size that the power cell output current of feedback function is taken back in adjustment.So as long as the power of frequency converter, motor and inductive load is enough big, the band of taking back feedback function power cell that the method that is provided in the embodiment of the invention then can satisfy in certain power bracket carries the experiment demand.
This device is during work, and energy gets into from first frequency converter 1, through first motor 3, second motor 4, second frequency converter 2, last again by the power cell of taking back the feedback function 5 with electric energy mode feedback grid.So, compare the load mode of the charged resistive load of power cell, this device is very little to the consumption of energy, the loss that loss that produces when having only own loss, the motor power conversion of frequency converter and inductive load produce.
In practice, the load voltage value of first motor 3 and second motor 4 can be the same or different, and is all example mutually with both load voltage values among Fig. 1 and describes.
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection range of the present invention.

Claims (8)

1. a charger of taking back the power cell of feedback function is characterized in that, said charger comprises:
The inductive load that first frequency converter, second frequency converter, first motor, second motor and being used for loads to the power cell of taking back the feedback function;
Wherein, first motor and second motor are formed a cover motor to dragging unit, and first motor and second motor are driven by first frequency converter, second frequency converter respectively, and running in the same way; The dc bus of second frequency converter composes in parallel common DC bus with the dc bus of taking back the power cell of feedback function;
The output frequency of setting second frequency converter is lower than first frequency converter; Make second motor operate in generating state; Its electric energy that sends partly feeds back to electrical network via the controlled rectification of the power cell of taking back the feedback function, realizes the controlled rectification loading partly to the power cell of taking back the feedback function; Inductive load partly joins with the inversion of taking back the power cell of feedback function, and the inversion of the power cell of taking back the feedback function is partly loaded.
2. the charger of taking back the power cell of feedback function according to claim 1 is characterized in that, described first motor and second motor are AC asynchronous motor.
3. the charger of taking back the power cell of feedback function according to claim 1 and 2; It is characterized in that; Described first motor and second motor are formed a cover motor to dragging the realization of unit, are to realize through the hard mode that connects of shaft coupling through the power transmission shaft of first motor and second motor.
4. a loading method of taking back the power cell of feedback function is characterized in that, comprising:
First motor and second motor are formed a cover motor to dragging unit, drive first motor and second motor with first frequency converter, second frequency converter respectively, first motor and second motor are turned round in the same way;
The dc bus of second frequency converter is composed in parallel common DC bus with the dc bus of taking back the power cell of feedback function;
Set the frequency converter output frequency; Make the output frequency of second frequency converter be lower than first frequency converter; Make second motor operate in generating state; Its electric energy that sends partly feeds back to electrical network via the controlled rectification of the power cell of taking back the feedback function, realizes the controlled rectification loading partly to the power cell of taking back the feedback function;
The inversion part of taking back the power cell of feedback function then loads through inductive load.
5. the loading method of taking back feedback function power cell according to claim 4 is characterized in that, the said size of current that flows through the controlled rectification part can be regulated through the difference on the frequency of adjusting first frequency converter and second frequency converter; Difference on the frequency more greatly then electric current is big more, otherwise then electric current is more little.
6. the loading method of taking back feedback function power cell according to claim 4; It is characterized in that; The said size of current that flows through the controlled rectification part; Can regulate the size of current that flows through the controlled rectification part through the torque limiting parameter of setting first frequency converter, the torque upper limit of setting more greatly then electric current is big more, otherwise then electric current is more little.
7. the loading method of taking back feedback function power cell according to claim 4; It is characterized in that, saidly first motor and second motor are formed a cover motor comprise: the power transmission shaft of first motor and second motor is connect through shaft coupling firmly dragging unit.
8. the loading method of taking back the power cell of feedback function according to claim 4 is characterized in that, can be connected a reactor between the said power cell of taking back the feedback function and the electrical network, to play a hindrance function.
CN2010105041550A 2010-10-12 2010-10-12 Loading device and method for power unit with feedback function Active CN102447265B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102818953A (en) * 2012-08-03 2012-12-12 北京金风科创风电设备有限公司 Wind condition simulation system and realization method of wind condition simulation system on wind power generator test table
CN103398845A (en) * 2013-08-13 2013-11-20 上海索达传动机械有限公司 Durability experiment device
CN105067925A (en) * 2015-07-29 2015-11-18 浙江易控电子科技有限公司 Energy-recyclable frequency converter testing system, testing method and installation method
CN108880341A (en) * 2018-07-21 2018-11-23 山东东风双隆机械有限公司 A kind of two motor Hard link revolving speed automatic balancing methods
CN108897720A (en) * 2018-06-29 2018-11-27 中国重型机械研究院股份公司 A kind of selection method of rectification unit drop power
CN110044615A (en) * 2019-05-09 2019-07-23 湖南大学 A kind of dynamically load electric machine control system and its application method
CN110286316A (en) * 2019-07-02 2019-09-27 中车大连机车研究所有限公司 It is a kind of based on pure inductance to the power module total power test method and system dragged
CN111678710A (en) * 2020-06-19 2020-09-18 上海蔚来汽车有限公司 Power assembly test system of vehicle

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JPH1123635A (en) * 1997-07-08 1999-01-29 Ricoh Keiki Kk Load controller and control method for power supply
JP2005245133A (en) * 2004-02-26 2005-09-08 Toyota Motor Corp Inverter testing device, inverter testing method, and inverter manufacturing method
CN201383685Y (en) * 2009-04-28 2010-01-13 北京中煤电气有限公司 Multi-power alternating current variable frequency electric energy feedback device
US20100164735A1 (en) * 2008-12-31 2010-07-01 Caterpillar Inc. System And Method For Testing Power Transistors

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Publication number Priority date Publication date Assignee Title
JPH1123635A (en) * 1997-07-08 1999-01-29 Ricoh Keiki Kk Load controller and control method for power supply
JP2005245133A (en) * 2004-02-26 2005-09-08 Toyota Motor Corp Inverter testing device, inverter testing method, and inverter manufacturing method
US20100164735A1 (en) * 2008-12-31 2010-07-01 Caterpillar Inc. System And Method For Testing Power Transistors
CN201383685Y (en) * 2009-04-28 2010-01-13 北京中煤电气有限公司 Multi-power alternating current variable frequency electric energy feedback device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102818953A (en) * 2012-08-03 2012-12-12 北京金风科创风电设备有限公司 Wind condition simulation system and realization method of wind condition simulation system on wind power generator test table
CN102818953B (en) * 2012-08-03 2015-08-19 北京金风科创风电设备有限公司 Condition stimulation system and the method realized on Wind turbines testing table thereof
CN103398845A (en) * 2013-08-13 2013-11-20 上海索达传动机械有限公司 Durability experiment device
CN105067925A (en) * 2015-07-29 2015-11-18 浙江易控电子科技有限公司 Energy-recyclable frequency converter testing system, testing method and installation method
CN108897720A (en) * 2018-06-29 2018-11-27 中国重型机械研究院股份公司 A kind of selection method of rectification unit drop power
CN108880341A (en) * 2018-07-21 2018-11-23 山东东风双隆机械有限公司 A kind of two motor Hard link revolving speed automatic balancing methods
CN110044615A (en) * 2019-05-09 2019-07-23 湖南大学 A kind of dynamically load electric machine control system and its application method
CN110286316A (en) * 2019-07-02 2019-09-27 中车大连机车研究所有限公司 It is a kind of based on pure inductance to the power module total power test method and system dragged
CN110286316B (en) * 2019-07-02 2022-02-01 中车大连机车研究所有限公司 Pure inductance drag-based power module full-power test method and system
CN111678710A (en) * 2020-06-19 2020-09-18 上海蔚来汽车有限公司 Power assembly test system of vehicle

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Inventor after: Wei Qisheng

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