KR101811591B1 - Power converting apparatus and air conditioner including the same - Google Patents
Power converting apparatus and air conditioner including the same Download PDFInfo
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- KR101811591B1 KR101811591B1 KR1020160027600A KR20160027600A KR101811591B1 KR 101811591 B1 KR101811591 B1 KR 101811591B1 KR 1020160027600 A KR1020160027600 A KR 1020160027600A KR 20160027600 A KR20160027600 A KR 20160027600A KR 101811591 B1 KR101811591 B1 KR 101811591B1
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- motor
- output current
- unit
- voltage
- command value
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Classifications
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
-
- F24F11/008—
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
-
- H02M2001/0006—
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Ac Motors In General (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a power conversion apparatus and an air conditioner having the power conversion apparatus. A power conversion apparatus according to an embodiment of the present invention includes a converter for converting an input AC power source to a DC power source, an inverter for converting a DC power source from the converter to an AC power source to drive the motor, The control unit controls the phase current applied to the motor or the ripple of the output current flowing to the motor to increase as the load of the motor increases. This makes it possible to perform stable motor driving in an air conditioner of a large capacity with a large motor load.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion apparatus and an air conditioner having the same, and more particularly, to a power conversion apparatus capable of performing stable motor driving in an air conditioner having a large motor load and an air conditioner will be.
The air conditioner is installed to provide a comfortable indoor environment for humans by discharging cold air to the room to adjust the room temperature and purify the room air to create a pleasant indoor environment. Generally, the air conditioner includes an indoor unit which is constituted by a heat exchanger and installed in a room, and an outdoor unit which is constituted by a compressor, a heat exchanger and the like and supplies the refrigerant to the indoor unit.
On the other hand, current large-capacity air conditioners rectify the input three-phase voltage using a diode, which is a passive element, and drive the motor through the inverter using the rectified voltage. In this case, as the load connected to the inverter increases, the dc step voltage decreases. Particularly, when the motor rotates at a high speed, the shortage of the dc step voltage tends to cause a restriction of high speed operation.
An object of the present invention is to provide a power conversion apparatus capable of performing stable motor driving in a large-capacity air conditioner having a large motor load and an air conditioner having the power conversion apparatus.
According to an aspect of the present invention, there is provided a power conversion apparatus comprising: a converter for converting input AC power to DC power; an inverter for converting a DC power from the converter to an AC power to drive the motor; And a controller for controlling the inverter on the basis of the output current. The controller controls the phase current applied to the motor or the magnitude of the ripple of the output current flowing to the motor as the load of the motor increases, .
According to another aspect of the present invention, there is provided a power conversion apparatus including: a converter for converting an input AC power to a DC power; an inverter for converting a DC power from the converter to an AC power to drive the motor; An output current detecting section for detecting an output current flowing to the motor; and a control section for controlling the inverter based on the output current. The control section injects a predetermined high-frequency signal to control the motor, , The position of the rotor of the motor is calculated, and the higher the load of the motor, the higher the level of the injected high-frequency signal.
According to another aspect of the present invention, there is provided an air conditioner including a compressor for compressing refrigerant, a heat exchanger for performing heat exchange using compressed refrigerant, and a power conversion device for driving the compressor, The power conversion apparatus includes: a converter that converts input AC power to DC power; an inverter that converts a DC power from the converter to an AC power to drive the motor; an output current detection unit that detects an output current flowing to the motor; The control unit controls the phase current applied to the motor or the ripple of the output current flowing to the motor to increase as the load of the motor increases.
According to another aspect of the present invention, there is provided an air conditioner including a compressor for compressing refrigerant, a heat exchanger for performing heat exchange using compressed refrigerant, and a power converter for driving the compressor, A converter for converting an input AC power source to a DC power source; an inverter for converting a DC power source from the converter into an AC power source to drive the motor; an output for detecting an output current flowing to the motor; And a control unit for controlling the inverter based on the output current. The control unit injects a predetermined high-frequency signal to control the motor, and based on the output current flowing to the motor, The higher the load of the motor, the higher the level of the injected high-frequency signal.
According to an embodiment of the present invention, a power conversion apparatus and an air conditioner having the power conversion apparatus include a converter for converting input AC power to DC power, an inverter for converting the DC power from the converter to AC power to drive the motor, And a control unit for controlling the inverter based on the output current. The control unit controls the phase current applied to the motor or the ripple of the output current flowing to the motor as the load of the motor increases. It is possible to perform stable motor driving in a large-capacity air conditioner having a large motor load.
Particularly, in order to control the motor, a predetermined high-frequency signal is injected, and the rotor position of the motor is calculated based on the output current flowing to the motor. By increasing the level of the injected high- , It is possible to stably grasp the rotor position of the motor despite the current noise component at a high load. Therefore, stable motor driving can be performed in a large-capacity air conditioner having a large motor load.
1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic view of the outdoor unit and the indoor unit of FIG.
3 is a block diagram of a power converter for driving a compressor in the outdoor unit of FIG.
4A is an internal block diagram of the inverter control unit of FIG.
4B is an internal block diagram of the converter control unit of FIG.
5A is a diagram illustrating a ripple waveform of an output current according to a load.
5B is a diagram illustrating a ripple waveform of an output current according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating an operation method of a power conversion apparatus according to an embodiment of the present invention.
Figs. 7A and 10B are views referred to the description of the operation method of Fig.
Hereinafter, the present invention will be described in detail with reference to the drawings.
The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.
1 is a diagram illustrating a configuration of an air conditioner according to an embodiment of the present invention.
1, a large-
The
The air conditioner may be any of a stand-type air conditioner, a wall-mounted air conditioner, and a ceiling-type air conditioner, but a ceiling-type air conditioner will be described as an example for convenience of explanation. In addition, the air conditioner may further include at least one of a ventilator, an air purifier, a humidifier, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.
The
The outdoor units (21, 22) operate the compressor and the outdoor heat exchanger to compress or heat-exchange the refrigerant according to the setting, and supply the refrigerant to the indoor units (31 to 35). The
At this time, the outdoor units (21, 22) are explained on the basis that the plurality of outdoor units supply the refrigerant to the indoor units connected to the indoor units, respectively. However, according to the connection structure of the outdoor units and the indoor units, .
The
At this time, the
The
In addition, the
2 is a schematic view of the outdoor unit and the indoor unit of FIG.
Referring to the drawings, the
The
The
At least one
Further, the
2, the
3 is a block diagram of a compressor motor drive apparatus in the outdoor unit of Fig.
The
The
The
Meanwhile, the
Meanwhile, the
Meanwhile, the
To this end, the
On the other hand, the
A capacitor C is connected to the output terminal of the
The
The
More specifically, the
The
Inverter switching control signal (Sic) is a switching control signal of a pulse width modulation (PWM), may be generated on the basis of the
The dc short-circuit voltage detector B can detect the voltage Vdc stored in the dc short-circuit capacitor C. To this end, the dc voltage detection unit B may include a voltage trnasformer (VT) or a resistance element. The detected dc voltage (Vdc) is input to the
The output current detection section E can detect the output current i o flowing between the
The output current detector E may be located between the
The
The
On the other hand, when the rate of change of the ripple of the phase current applied to the
On the other hand, the
On the other hand, the
4A is an internal block diagram of the inverter control unit of FIG.
4A, the
The
On the other hand, the
The
On the other hand, the current
On the other hand, the current
Next, the voltage
The
On the other hand, the generated d-axis and q-axis voltage command values (v * d and v * q ) are input to the
On the other hand, the signal injection
On the other hand, the signal injection
In particular, the signal injection
On the other hand, the high-frequency
The
First, the
Then, the
The switching control
In particular, the switching control
The output inverter switching control signal Sic may be converted into a gate driving signal in a gate driving unit (not shown) and input to the gate of each switching element in the
4B is an internal block diagram of the converter control unit of FIG.
The
Based on the dc terminal voltage (Vdc) and the dc terminal voltage command value (V * dc) detected by the output voltage detecting section (B), that is, the dc terminal voltage detecting section (B), the current command generating section (410) The q-axis current command value (i * d , i * q ) can be generated.
Voltage command generation section 420 d, q-axis current instruction value through the like (i * d, i * q ) and the input current detected (i L) by the PI control based on the d, q-axis voltage command value (v * d , v * q ).
Switching control
On the other hand, it is important to accurately grasp the position of the rotor of the motor when the motor is driven by a sensorless method that does not use sensors such as Hall sensors.
On the other hand, a high-frequency signal injection technique may be used to accurately detect the position of the rotor at a low speed.
The high frequency signal injection technique is a technique of calculating the position of the rotor of the motor by using the ripple component of the phase current according to the high frequency voltage command value separately from the phase current of the low speed by popularizing a separate high frequency voltage command value with the voltage command value.
5A is a diagram illustrating a ripple waveform of an output current according to a load.
5A illustrates the ripple waveform ia1 of the output current flowing to the motor when the motor load is low.
When the load of the compressor motor is low, the ripple waveform ia1 of the output current corresponding to the high-frequency signal to be injected is not distorted.
FIG. 5A illustrates the ripple waveform ia2 of the output current flowing to the motor when the motor load is high.
On the other hand, when the load of the compressor motor is at a high load, distortion occurs in the ripple waveform ia2 of the output current corresponding to the high-frequency signal to be injected.
This distortion is caused by the fact that as the motor load increases, a noise component due to an increase in the motor load is generated in the output current.
In the present invention, FIG. 5B shows a method of preventing distortion of the ripple waveform ia2 of the output current even when the motor load is high.
As described above, as the load of the
In particular, as the load of the
5B is a diagram illustrating a ripple waveform of an output current according to an exemplary embodiment of the present invention.
5 (a) illustrates the output current flowing to the motor when the motor load is low, that is, the phase current waveform iaa.
When the load of the compressor motor is low, the ripple waveform iaa of the output current corresponding to the high-frequency signal to be injected is not distorted.
5B shows the output current flowing to the motor when the motor load is at a high load, that is, the phase current waveform iab.
As described above, as the load of the
FIG. 6 is a flowchart illustrating an operation method of a power conversion apparatus according to an embodiment of the present invention, and FIGS. 7A to 10B are views referred to the description of the operation method of FIG.
The dc voltage detection unit B, the output current detection unit E and the like in the
The
Next, the
In particular, the output current io is converted into a flux current i d and a torque current iq through the
Next, the
The
For example, the
Next, the
For example, the
That is, the
As another example, the
Next, the
That is, the
Specifically, the
Alternatively, the
Figs. 7A to 7B illustrate the magnetic flux minute current waveform when a constant high-frequency voltage command value is output regardless of the motor load as a conventional method.
According to this, as shown in FIG. 7A, when the load of the
On the other hand, as shown in FIG. 7B, when the load of the
8A to 8B illustrate the flux minute current waveform when the level of the high frequency voltage command value is varied corresponding to the motor load as the method of the present invention.
According to this, as shown in FIG. 8A, when the load of the
On the other hand, as shown in FIG. 8B, when the load of the
In particular, it can be seen that the ripple of the magnetic flux partial current idb becomes larger as the motor load increases. Thus, based on the stable ripple, the position of the rotor of the motor can be accurately grasped, and hence the motor drive stability can be improved at high load and low torque.
Figs. 9A to 9B illustrate the ripple waveform of the output current flowing to the motor, that is, the phase current when a constant high-frequency voltage command value is output, irrespective of the motor load, as a conventional system.
According to this, as shown in Fig. 9A, when the load of the
9B, even when the load of the
10A to 10B illustrate a ripple waveform of an output current flowing in a motor, that is, a phase current in the case of varying the level of a high frequency voltage command value corresponding to a motor load as a system of the present invention.
According to this, as shown in FIG. 10A, when the load of the
Next, as shown in FIG. 10B, when the load of the
Thus, based on the stable ripple waveform, the position of the rotor of the motor can be grasped accurately, and therefore, the motor drive stability is improved at high load and low torque.
The power conversion apparatus and the air conditioner having the power conversion apparatus according to the present invention are not limited to the configuration and method of the embodiments described above, Or some of them may be selectively combined.
Meanwhile, the operation method of the power conversion apparatus or the air conditioner of the present invention can be implemented as a code that can be read by a processor on a processor-readable recording medium provided in a power conversion apparatus or an air conditioner. The processor-readable recording medium includes all kinds of recording apparatuses in which data that can be read by the processor is stored. Examples of the recording medium that can be read by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave such as transmission over the Internet . In addition, the processor-readable recording medium may be distributed over network-connected computer systems so that code readable by the processor in a distributed fashion can be stored and executed.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.
Claims (10)
An inverter for converting a DC power from the converter to an AC power to drive the motor;
An output current detector for detecting an output current flowing to the motor;
And a controller for controlling the inverter based on the output current,
Wherein,
An axial conversion unit for receiving the three-phase output current detected by the output current detection unit and converting the two-phase current of the stationary coordinate system into a two-phase current of the stationary coordinate system;
And an estimating unit that estimates a rotor position and a speed of the motor based on the two-phase current of the stationary coordinate system converted by the axis converting unit,
And generates and outputs an inverter switching control signal on the basis of the estimated speed and the speed command value. When the rate of change of the ripple of the phase current applied to the motor or the output current flowing to the motor is equal to or greater than a predetermined value, So as to increase the level of the signal injection voltage.
Wherein,
And a controller for calculating a rotor position of the motor based on the output current flowing through the motor,
And increases the level of the injected high-frequency signal as the load of the motor increases.
Wherein,
And controls the phase current to be applied to the motor or the ripple of the output current flowing to the motor to increase as the load of the motor increases.
Wherein,
And controls so that the level of the flux current of the output current increases as the load of the motor increases.
Wherein,
Wherein the control is performed so that the level of the flux current of the output current increases as the amount of change in the flux current of the output current flowing to the motor becomes larger.
Wherein,
A current command generator for generating a current command value based on the estimated speed and the speed command value;
A voltage command generator for generating a voltage command value based on the current command value and the output current flowing to the motor;
A signal injection voltage varying unit for varying a signal injection voltage based on the output current;
A high-frequency signal injection unit for outputting a high-frequency voltage command value corresponding to a variable voltage in the signal injection voltage variable unit;
And a switching control signal output unit for generating and outputting the inverter switching control signal based on the voltage command value and the high frequency voltage command value.
Wherein the signal injection voltage varying unit comprises:
And increases the level of the signal injection voltage as the load of the motor increases.
Wherein the signal injection voltage varying unit comprises:
And increases the level of the signal injection voltage in proportion to the load of the motor when the rate of change of the ripple of the phase current applied to the motor or the output current flowing to the motor is greater than or equal to a predetermined value.
Wherein,
A signal injection voltage varying unit for varying a signal injection voltage based on the output current detected by the output current detection unit;
A high-frequency signal injection unit for outputting a high-frequency voltage command value corresponding to a variable voltage in the signal injection voltage variable unit;
And a switching control signal output unit for generating and outputting the inverter switching control signal based on the voltage command value based on the target speed and the high frequency voltage command value,
And controls the phase current to be applied to the motor or the ripple of the output current flowing to the motor to increase as the load of the motor increases.
A heat exchanger for performing heat exchange using the compressed refrigerant; And
The air conditioner according to any one of claims 1 to 9, for driving the compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160027600A KR101811591B1 (en) | 2016-03-08 | 2016-03-08 | Power converting apparatus and air conditioner including the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160027600A KR101811591B1 (en) | 2016-03-08 | 2016-03-08 | Power converting apparatus and air conditioner including the same |
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| Publication Number | Publication Date |
|---|---|
| KR20170104778A KR20170104778A (en) | 2017-09-18 |
| KR101811591B1 true KR101811591B1 (en) | 2017-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020160027600A KR101811591B1 (en) | 2016-03-08 | 2016-03-08 | Power converting apparatus and air conditioner including the same |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010154597A (en) * | 2008-12-24 | 2010-07-08 | Aisin Aw Co Ltd | Sensorless motor controller |
| JP2012228058A (en) * | 2011-04-19 | 2012-11-15 | Hitachi Industrial Equipment Systems Co Ltd | Electric power conversion apparatus and motor drive system |
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2016
- 2016-03-08 KR KR1020160027600A patent/KR101811591B1/en active IP Right Grant
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010154597A (en) * | 2008-12-24 | 2010-07-08 | Aisin Aw Co Ltd | Sensorless motor controller |
| JP2012228058A (en) * | 2011-04-19 | 2012-11-15 | Hitachi Industrial Equipment Systems Co Ltd | Electric power conversion apparatus and motor drive system |
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| Publication number | Publication date |
|---|---|
| KR20170104778A (en) | 2017-09-18 |
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