CN103267945A - Variable-frequency power source for multifunctional variable frequency motor test and waveform generation method - Google Patents
Variable-frequency power source for multifunctional variable frequency motor test and waveform generation method Download PDFInfo
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- CN103267945A CN103267945A CN2013101322455A CN201310132245A CN103267945A CN 103267945 A CN103267945 A CN 103267945A CN 2013101322455 A CN2013101322455 A CN 2013101322455A CN 201310132245 A CN201310132245 A CN 201310132245A CN 103267945 A CN103267945 A CN 103267945A
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Abstract
The invention provides a variable-frequency power source for a multifunctional variable frequency motor test. The variable-frequency power source comprises a rectification unit, an energy-storing unit, an inversion unit and a control unit, wherein the control unit respectively controls the rectification unit and the inversion unit; the energy-storing unit is connected between the rectification unit and the inversion unit in series; an external power source is input into the rectification unit; and the inversion unit is connected with a motor to be tested. The variable-frequency power source is characterized in that the control unit is internally integrated with three control manners. The other technical scheme of the invention provides a waveform generation method of the variable-frequency power source for the multifunctional variable frequency motor test. With the adoption of the variable-frequency power source for the multifunctional variable frequency motor test and the waveform generation method of the variable-frequency power source for the multifunctional variable frequency motor test disclosed by the invention, frequency converters with different types of the variable-frequency power sources do not need to be purchased and only one frequency converter can realize the effect of being matched with various motors, so that the cost is saved, the benefits are improved and the application field is widened.
Description
Technical field
The present invention relates to a kind of variable-frequency motor test with three kinds of control modes with variable-frequency power sources and waveform output method, belong to the Motor Measuring System field.
Background technology
According to requiring the variable-frequency motor experiment power supply in " GBT22670-2008 inverter supply three-phase cage induction motor test method ": " performance of motor and frequency converter characteristic are closely related.Motor should be by the inverter supply that is fit to, and tests under same carrier frequency." the output waveform type of frequency converter mainly contains PWM carrier frequency difference, pulse width modulation mode is not equal.The control technology of modern frequency converter product mainly contains 3 kinds: v/f control sinusoidal pulse width modulation (SPWM) control mode, vector controlled (vc) mode and Direct Torque Control (dtc) mode.Adopt different control modes, just can obtain different output waveforms and the frequency converter under the control mode.These three kinds of control modes respectively have relative merits, the application that emphasizes particularly on different fields in actual applications owing to the difference that has on the control method.
V/f control is exactly the control that guarantees that output voltage follows frequency to be directly proportional, and can make the magnetic flux of motor keep certain like this, avoids the generation of weak magnetic and magnetic saturation phenomenon.V/f control sinusoidal pulse width modulation (SPWM) control mode output waveform as shown in Figure 1.
The frequency control of vector controlled (vc) mode is that stator current I α, Ib, the Ic of asynchronous motor under three phase coordinate systems passed through three-phase-two phase inversion, equivalence becomes alternating current Ia1, the Ib1 under the two-phase rest frame, again by pressing rotor field-oriented rotational transform, equivalence becomes DC current Im1, the It1 under the synchronous rotating frame, imitate the control method of direct current motor then, try to achieve the controlled quentity controlled variable of direct current motor, through corresponding coordinate inverse transformation, realize the control to asynchronous motor.The output waveform of vector controlled (VC) mode as shown in Figure 2.
Direct Torque Control (dtc) mode is to utilize space vector coordinate concept, under the stator coordinate system, analyze the mathematical model of AC motor, magnetic linkage and the torque of control motor, by detecting the purpose that stator resistance reaches the observation stator magnetic linkage, therefore saved the transformation calculations of vector controlled complexity, computing velocity and ratio of precision vector controlled increase.Even under open loop situations, also can export 100% nominal torque, have the balancing the load function for dragging more.The output waveform of Direct Torque Control (dtc) mode is more complicated.
As shown in Figure 3, be existing variable-frequency power sources control mode structural representation, comprise by rectification unit and the inversion unit of main control unit control, be connected with energy-storage units between rectification unit and the inversion unit.Its structural disadvantages is, main control unit can only be controlled the waveform that rectification unit and inversion unit produce a kind of control mode, it is v/f control sinusoidal pulse width modulation control mode output waveform, it is the vector control mode output waveform, be the Direct Torque Control output waveform, so application is restricted.
Summary of the invention
The purpose of this invention is to provide a kind of variable-frequency power sources that can select to export in three kinds of control waveforms any one.Another object of the present invention provides a kind of Waveform generating method of above-mentioned variable-frequency power sources.
In order to achieve the above object, a technical scheme of the present invention has provided a kind of multifunctional variable-frequency motor test variable-frequency power sources, comprise rectification unit, energy-storage units, inversion unit and control module, control module is controlled rectification unit and inversion unit respectively, energy-storage units is serially connected between rectification unit and the inversion unit, external power source input rectifying unit, inversion unit connects tested motor, it is characterized in that: in control module, be integrated with v/f control sinusoidal pulse width modulation control mode module, vector control mode module and Direct Torque Control mode module, select v/f control sinusoidal pulse width modulation control mode module by the set-up function sign indicating number, a module in vector control mode module or the Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce corresponding output waveform.
Another technical scheme of the present invention has provided the Waveform generation method that a kind of above-mentioned multifunctional variable-frequency motor test is used variable-frequency power sources, it is characterized in that step is:
Set-up function sign indicating number n, when function code n=0, only v/f control sinusoidal pulse width modulation control mode module is had an effect, and control rectification unit and inversion unit produce v/f control sinusoidal pulse width modulation control mode output waveform; When function code n=1, only the vector control mode module is had an effect, and control rectification unit and inversion unit produce the vector control mode output waveform; When function code n=2, only Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce torque control mode output waveform.
After adopting the present invention, the frequency converter and the motor that need not to buy the variety classes variable-frequency power sources are complementary, and only need a frequency converter just can reach the effect that is complementary with multiple motor, and the saving cost is increased the benefit, and widens application.
Description of drawings
Fig. 1 is v/f control sinusoidal pulse width modulation (SPWM) control mode output waveform;
Fig. 2 is the output waveform of vector controlled (VC) mode;
Fig. 3 is existing variable-frequency power sources control mode structure;
Fig. 4 is variable-frequency power sources control mode principle schematic of the present invention.
Embodiment
For the present invention is become apparent, now with preferred embodiment, and conjunction with figs. is described in detail below.
The invention provides a kind of multifunctional variable-frequency motor test variable-frequency power sources, comprise rectification unit, energy-storage units, inversion unit and control module, control module is controlled rectification unit and inversion unit respectively, energy-storage units is serially connected between rectification unit and the inversion unit, external power source input rectifying unit, inversion unit connects tested motor, it is characterized in that: in control module, be integrated with v/f control sinusoidal pulse width modulation control mode module, vector control mode module and Direct Torque Control mode module, select v/f control sinusoidal pulse width modulation control mode module by the set-up function sign indicating number, a module in vector control mode module or the Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce corresponding output waveform.
In conjunction with Fig. 4, the present invention also provides a kind of above-mentioned multifunctional variable-frequency motor test Waveform generation method of variable-frequency power sources, the steps include:
Set-up function sign indicating number n, when function code n=0, only v/f control sinusoidal pulse width modulation control mode module is had an effect, and control rectification unit and inversion unit produce v/f control sinusoidal pulse width modulation control mode output waveform as shown in Figure 1; When function code n=1, only the vector control mode module is had an effect, and control rectification unit and inversion unit produce vector control mode output waveform as shown in Figure 2; When function code n=2, only Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce torque control mode output waveform.
Characteristics of the present invention are that the main circuit form of variable-frequency motor experiment power supply all adopts same topological structure, go up integrated v/f control sinusoidal pulse width modulation (SPWM) control mode at the control mainboard (CPU board) of variable-frequency power sources, vector controlled (vc) mode and three kinds of control programs of Direct Torque Control (dtc) mode, set control mode by function code, when variable-frequency motor is tested according to the demand of variable-frequency motor, select suitable variable frequency control mode, export suitable frequency conversion waveform, also can regulate simultaneously the carrier frequency of variable-frequency power sources by function code, so just form the multifunction test variable-frequency power sources that can be fit to all kinds of variable-frequency motor tests.
Operation is simple for this hookup.Simultaneously, because multifunctional variable-frequency motor test of the present invention integrates three kinds of control modes with variable-frequency power sources, satisfy the experiment demand of all types of variable-frequency motors, saved operation cost to a great extent, have higher utility.
Claims (2)
1. multifunctional variable-frequency motor test variable-frequency power sources, comprise rectification unit, energy-storage units, inversion unit and control module, control module is controlled rectification unit and inversion unit respectively, energy-storage units is serially connected between rectification unit and the inversion unit, external power source input rectifying unit, inversion unit connects tested motor, it is characterized in that: in control module, be integrated with v/f control sinusoidal pulse width modulation control mode module, vector control mode module and Direct Torque Control mode module, select v/f control sinusoidal pulse width modulation control mode module by the set-up function sign indicating number, a module in vector control mode module or the Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce corresponding output waveform.
2. a multifunctional variable-frequency motor test as claimed in claim 1 is characterized in that step is with the Waveform generation method of variable-frequency power sources:
Set-up function sign indicating number n, when function code n=0, only v/f control sinusoidal pulse width modulation control mode module is had an effect, and control rectification unit and inversion unit produce v/f control sinusoidal pulse width modulation control mode output waveform; When function code n=1, only the vector control mode module is had an effect, and control rectification unit and inversion unit produce the vector control mode output waveform; When function code n=2, only Direct Torque Control mode module is had an effect, and control rectification unit and inversion unit produce torque control mode output waveform.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104360294A (en) * | 2014-11-20 | 2015-02-18 | 保定天威集团有限公司 | Method and platform for testing magnetic performance of laminated iron core of transformer in controllable excitation conditions |
| CN113872470A (en) * | 2021-09-01 | 2021-12-31 | 河北汉光重工有限责任公司 | Dual-mode composite control method of brushless direct current motor |
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| EP0413966A2 (en) * | 1989-08-23 | 1991-02-27 | Mitsubishi Denki Kabushiki Kaisha | Pulse width modulation type inverter having temperature compensation |
| JPH0356089A (en) * | 1989-04-05 | 1991-03-11 | Mitsubishi Electric Corp | Controller for compressor of enclosed type |
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| CN102749566A (en) * | 2012-07-26 | 2012-10-24 | 广东电网公司惠州供电局 | Variable-frequency series resonance test method based on FPGA (field programmable gate array) |
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| US3694718A (en) * | 1970-10-19 | 1972-09-26 | Gen Electric | Methods of inverter voltage control by superimposed chopping |
| JPH0356089A (en) * | 1989-04-05 | 1991-03-11 | Mitsubishi Electric Corp | Controller for compressor of enclosed type |
| EP0413966A2 (en) * | 1989-08-23 | 1991-02-27 | Mitsubishi Denki Kabushiki Kaisha | Pulse width modulation type inverter having temperature compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104360294A (en) * | 2014-11-20 | 2015-02-18 | 保定天威集团有限公司 | Method and platform for testing magnetic performance of laminated iron core of transformer in controllable excitation conditions |
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| CN113872470A (en) * | 2021-09-01 | 2021-12-31 | 河北汉光重工有限责任公司 | Dual-mode composite control method of brushless direct current motor |
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Application publication date: 20130828 |