CN102403952A - Control device for output voltage estimation method of three-level current transformer - Google Patents
Control device for output voltage estimation method of three-level current transformer Download PDFInfo
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- CN102403952A CN102403952A CN2011103899078A CN201110389907A CN102403952A CN 102403952 A CN102403952 A CN 102403952A CN 2011103899078 A CN2011103899078 A CN 2011103899078A CN 201110389907 A CN201110389907 A CN 201110389907A CN 102403952 A CN102403952 A CN 102403952A
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Abstract
The invention discloses a control device for an output voltage estimation method of a three-level current transformer, which belongs to the technical field of vector control of a three-level motor. The control device comprises a three-phase alternating current input power supply, a power switch, a frequency changer, a motor, an upper bus voltage sensor, a lower bus voltage sensor, a voltage sampling circuit, a voltage estimation controller and a system controller. The beneficial effects are that: the output voltage of each phase is obtained by corresponding control through the direct current bus information and the phase action time information directly according to equivalent relation of three level and two level in a space voltage vector, the corresponding voltage sensor is removed, a hardware structure of a system is simplified, a higher-reliability phase voltage is obtained, and the speed control accuracy of the system at high and low speed stages is improved.
Description
Technical field
The present invention relates to a kind of control device, specifically is a kind of control device of three-level current transformer output voltage evaluation method, belongs to three level motor vector control technology fields.
Background technology
In three level high-performance motor vector control systems, the whether accurate performance to system of output phase voltage has very big influence.Traditional method has two kinds at present, and a kind of is to adopt output voltage sensor to be sampled in the control system through A/D.Second kind is directly to adopt the instruction of SVPWM to export phase voltage as reality.
For first method; Must increase corresponding A/D number of active lanes when needing to increase transducer; And the voltage of three-level converter output is staircase waveform; With common instantaneous sampling A/D converter adopt value be not the mean value of actual waveform in a switch periods, can not truly reflect the size of output voltage in this switch periods.For second method, the burst pulse problem is its inaccurate root, because the instruction of not all output and SVPWM is identical to establishing a capital, particularly in motor low speed and high regime, the burst pulse problem is more serious.
Simultaneously since three level output levels than two level topological structures mostly; And output voltage vector three times of two level especially; If directly through the output voltage order; Add very difficulty of words that master vector, zero vector and inferior vector calculate action time respectively, make the reliability of control system and accuracy can't obtain technical guarantee.
Summary of the invention
Problem to above-mentioned prior art existence; The present invention provides a kind of control device of three-level current transformer output voltage evaluation method, has replaced output voltage sensor, and is more accurate than directly using the SVPWM instruction simultaneously; Simplify the composition of system, improved the reliability and stability of system.
To achieve these goals; The present invention realizes through following technical scheme: a kind of control device of three-level current transformer output voltage evaluation method; Comprise three-phase alternating current input power supply, mains switch, frequency converter, motor, Up Highway UHW voltage sensor, Down Highway voltage sensor, voltage sampling circuit, voltage estimate controller and system controller; Three-phase alternating current input power supply is connected with frequency converter through mains switch; Frequency converter is connected with motor; Frequency converter is connected with voltage sampling circuit with the Down Highway voltage sensor through the Up Highway UHW voltage sensor respectively simultaneously, and voltage sampling circuit is connected with system controller with the voltage estimate controller respectively, and the voltage estimate controller interconnects with system controller again.
Frequency converter is the frequency converter of three level topological structures.
Voltage sampling circuit is the voltage sampling circuit that comprises voltage modulate circuit and 12 high-precision AD transducers.
The voltage estimate controller is three-level current transformer output voltage estimation controller, and sends estimated value to system controller.
System controller is the alternating current machine vector control apparatus, be made up of flux observer and two closed-loop vector controllers, and the voltage given signal that motor is required sends the voltage estimate controller to.
The invention has the beneficial effects as follows: utilize three level and the equivalent relation of two level on space voltage vector; Directly action time, information obtained each phase output voltage through corresponding control mutually with each through dc bus information; Omitted the correspondent voltage transducer; Simplified the hardware configuration of system, obtained the higher phase voltage of reliability, improved the velocity control accuracy of system at high regime and low speed segment.
Description of drawings
Fig. 1 is a control device system construction drawing of the present invention.
Among the figure: 1, three-phase alternating current input power supply, 2, mains switch, 3, frequency converter, 4, motor, 5, the Up Highway UHW voltage sensor, 6, the Down Highway voltage sensor, 7, voltage sampling circuit, 8, the voltage estimate controller, 9, system controller.
Embodiment
To combine accompanying drawing that the present invention is further specified below.
As shown in Figure 1; A kind of control device of three-level current transformer output voltage evaluation method; Comprise three-phase alternating current input power supply 1, mains switch 2, frequency converter 3, motor 4, Up Highway UHW voltage sensor 5, Down Highway voltage sensor 6, voltage sampling circuit 7, voltage estimate controller 8 and system controller 9; Three-phase alternating current input power supply 1 is connected with frequency converter 3 through mains switch 2; Frequency converter 3 is connected with motor 4; Frequency converter 3 is connected with voltage sampling circuit 7 with Down Highway voltage sensor 6 through Up Highway UHW voltage sensor 5 respectively simultaneously, and voltage sampling circuit 7 is connected with system controller 9 with voltage estimate controller 8 respectively, and voltage estimate controller 8 interconnects with system controller 9 again.
The course of work of the present invention is: three-phase alternating current input power supply 1 is current transformer 3 power supplies of three level topological structures through mains switch 2; The winding of motor 4 is received on the frequency converter 3; And then control motor 4; DC bus-bar voltage is connected with voltage sampling circuit 7 through Up Highway UHW voltage sensor 5, Down Highway voltage sensor 6; Voltage sampling circuit 7 connects voltage estimate controller 8 and system controller 9 more respectively, will give voltage estimate controller 8 and system controller 9 through the DC bus-bar voltage signal feedback that upper and lower voltage sensor 5,6 records.
Claims (5)
1. the control device of a three-level current transformer output voltage evaluation method; Comprise three-phase alternating current input power supply (1), mains switch (2), frequency converter (3), motor (4), Up Highway UHW voltage sensor (5), Down Highway voltage sensor (6), voltage sampling circuit (7), voltage estimate controller (8) and system controller (9); It is characterized in that; Three-phase alternating current input power supply (1) is connected with frequency converter (3) through mains switch (2); Frequency converter (3) is connected with motor (4); Frequency converter (3) is connected with voltage sampling circuit (7) with Down Highway voltage sensor (6) through Up Highway UHW voltage sensor (5) respectively simultaneously; Voltage sampling circuit (7) is connected with system controller (9) with voltage estimate controller (8) respectively, and voltage estimate controller (8) interconnects with system controller (9) again.
2. the control device of a kind of three-level current transformer output voltage evaluation method according to claim 1 is characterized in that, frequency converter (3) is the frequency converter of three level topological structures.
3. the control device of a kind of three-level current transformer output voltage evaluation method according to claim 1 is characterized in that, voltage sampling circuit (7) is the voltage sampling circuit that comprises voltage modulate circuit and 12 high-precision AD transducers.
4. the control device of a kind of three-level current transformer output voltage evaluation method according to claim 1; It is characterized in that; Voltage estimate controller (8) is three-level current transformer output voltage estimation controller, and sends estimated value to system controller (9).
5. according to the control device of claim 1 or 4 described a kind of three-level current transformer output voltage evaluation methods; It is characterized in that; System controller (9) is the alternating current machine vector control apparatus; Constitute by flux observer and two closed-loop vector controllers, and the voltage given signal that motor (4) is required sends voltage estimate controller (8) to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103899078A CN102403952A (en) | 2011-11-30 | 2011-11-30 | Control device for output voltage estimation method of three-level current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103899078A CN102403952A (en) | 2011-11-30 | 2011-11-30 | Control device for output voltage estimation method of three-level current transformer |
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| CN102403952A true CN102403952A (en) | 2012-04-04 |
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| CN2011103899078A Pending CN102403952A (en) | 2011-11-30 | 2011-11-30 | Control device for output voltage estimation method of three-level current transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873100A (en) * | 2010-06-11 | 2010-10-27 | 中国矿业大学 | Simplified phase-voltage reconstruction method of three-level converter |
| US20110062903A1 (en) * | 2009-09-16 | 2011-03-17 | Kabushiki Kaisha Toshiba | Motor control device and electrical equipment provided with the same |
| JP2011067054A (en) * | 2009-09-18 | 2011-03-31 | Toshiba Corp | Motor control apparatus |
| CN102088271A (en) * | 2010-12-20 | 2011-06-08 | 广东美的电器股份有限公司 | Sensor-less sine DC (direct current) variable frequency current sampling method |
| CN202406083U (en) * | 2011-11-30 | 2012-08-29 | 徐州中矿大传动与自动化有限公司 | Control device for three-level converter output voltage estimating method |
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2011
- 2011-11-30 CN CN2011103899078A patent/CN102403952A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110062903A1 (en) * | 2009-09-16 | 2011-03-17 | Kabushiki Kaisha Toshiba | Motor control device and electrical equipment provided with the same |
| JP2011067054A (en) * | 2009-09-18 | 2011-03-31 | Toshiba Corp | Motor control apparatus |
| CN101873100A (en) * | 2010-06-11 | 2010-10-27 | 中国矿业大学 | Simplified phase-voltage reconstruction method of three-level converter |
| CN102088271A (en) * | 2010-12-20 | 2011-06-08 | 广东美的电器股份有限公司 | Sensor-less sine DC (direct current) variable frequency current sampling method |
| CN202406083U (en) * | 2011-11-30 | 2012-08-29 | 徐州中矿大传动与自动化有限公司 | Control device for three-level converter output voltage estimating method |
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Application publication date: 20120404 |