JP2000041397A - Vibration alleviating apparatus for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration alleviating apparatus for an air conditioner for reducing vibrations, by a repetition of a regenerative state and a power state of an induction motor of the conditioner to be driven by an inverter. SOLUTION: In an inverter 3, the variation in energy communicated between a DC power source 7 and a power converter 8 is detected as a voltage change by a voltage change detector 9. Only the change content of the voltage change is extracted from an AC component by a change content detector 10 is waveform shaped into a pulse. The pulse is outputted. A waveform calculator 11 calculates a regenerative frequency change amount and a power frequency change amount based on pulse widths of the pulses, corresponding to the regenerative state and the power state. Thus, a fundamental frequency command value for designating the frequency of the converter 8 and a boosted chopper reference voltage command value for designating an output voltage of a booster chopper 6 are corrected, based on the regenerative frequency change value when regenerating or based on the power frequency change amount at the time of the power state, thereby controlling the direction for suppressing vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration reducing device in an air conditioner in which a compressor is driven by a PWM type voltage type inverter device.

[0002]

2. Description of the Related Art A conventional air conditioner will be described below. V / F by PWM type voltage type inverter device
When the compressor is driven with a constant value, abnormal vibration may occur depending on the operating frequency, the electric constant of the induction motor, the state of the load, and the like.

[0003] As a control means for suppressing the vibration when the vibration is generated, for example, there is an apparatus disclosed in Japanese Patent Publication No. 5-28078. In this means, vibration is prevented by detecting the polarity and the cycle of the current flowing between the DC power supply unit and the power conversion unit, and correcting the fundamental frequency command value according to the polarity and the length of the cycle. I am trying to do it.

[0004]

In such a conventional vibration damping means for an air conditioner, power running or regeneration is judged based on the polarity of the current flowing between the DC power supply unit and the power conversion unit. Therefore, when the compressor of the air conditioner is driven and vibration occurs under a certain load, the detection of only the section where the negative current is flowing is performed as shown in FIG. However, if the energy fluctuation is unevenly changing, the fluctuation reference cannot be detected accurately, and the vibration reduction control is performed based on this signal. A problem arises in that the timing of controlling is shifted, resulting in a decrease in stability.

[0005] A non-contact current transformer is used as a detector for detecting a current flowing between the DC power supply unit and the power conversion unit. However, the non-contact current transformer is relatively expensive and costly. At present, it is difficult to apply to air conditioners.

Further, in the conventional configuration, since a full-wave rectification system using a diode for the rectification unit is employed, the maximum voltage of the DC power supply unit is determined by the power supply voltage, and vibration occurs in a region above the base frequency. In such a case, the voltage cannot be increased beyond the maximum voltage, so that the vibration reduction control has been impossible.

[0007] The present invention solves the above-mentioned problems, and even when the reference for the change in energy between the DC power supply unit and the power conversion unit is biased, the change in energy can be accurately grasped and the base is changed. It is an object of the present invention to provide a vibration reduction device for an air conditioner that can exhibit an effect even in a frequency range or higher.

[0008]

According to a first aspect of the present invention, there is provided an inverter apparatus for inputting AC power from a three-phase AC power supply via a reactor and supplying variable frequency and variable voltage AC power to an induction motor. In the air conditioner provided, the inverter device includes a rectifying unit that rectifies an AC voltage of the three-phase AC power supply, and a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage. A power conversion unit that converts a DC voltage output by the boost chopper unit into a frequency-variable and voltage-variable AC voltage,
A voltage fluctuation detection unit that detects a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change, and extracts only an AC component in an output of the voltage fluctuation detection unit, and compares the AC component with an average voltage. A fluctuation detecting unit that outputs pulses corresponding to the large part and the small part, a boost chopper voltage control unit that controls an output voltage of the boost chopper, and a pulse width and a timing based on the pulse. The regenerative voltage fluctuation amount corresponding to the regenerative state of the induction motor and the powering voltage fluctuation amount corresponding to the powering state are calculated,
A basic frequency command value indicating an AC frequency output by the power conversion unit and an output voltage of the boost chopper unit, the regenerative voltage fluctuation amount in the regenerative state, and the powering voltage fluctuation amount in the powering state. A waveform calculation unit that controls the power conversion unit and the boost chopper voltage control unit while correcting in a direction to reduce vibration due to repetition of a regenerative state and a powering state of the induction motor based on the waveform calculation. An air conditioning unit configured to correct the output voltage of the step-up chopper to a range equal to or higher than the output voltage of the rectifier in accordance with the corrected basic frequency command value exceeding a predetermined base frequency in the correction. It is a vibration reduction device in the device.

According to the present invention, even when the reference for the change in the energy transferred between the step-up chopper and the power converter is biased, the change point in the transfer of energy can be accurately grasped, and the induction can be obtained. Since the output voltage of the step-up chopper can be controlled even in a region where the operating frequency of the motor exceeds a predetermined base frequency, vibration generated in the compressor of the air conditioner can be reduced at low cost over the entire output range of the inverter device. it can. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

According to a second aspect of the present invention, there is provided an air conditioner having an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and variable voltage AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. And min Detection unit, a step-up chopper voltage control unit for controlling the output voltage of the boost chopper unit, a DC voltage detection unit for detecting an output voltage of the boost chopper unit,
The DC unit voltage fluctuation detection unit that detects the fluctuation range of the detected DC voltage, and compares the fluctuation width of the DC voltage with a predetermined DC unit fluctuation allowable value, and when the fluctuation width exceeds the DC unit fluctuation allowable value. A comparing unit that outputs a variation coefficient corresponding to the excess, a regenerative voltage variation corresponding to a regenerative state of the induction motor based on the pulse width and timing of the pulse, and the variation coefficient, and a powering voltage corresponding to a powering state. Calculate the amount of fluctuation, the basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the boost chopper unit, the regenerative voltage fluctuation amount in the regenerative state, the power running state Controls the power conversion unit and the step-up chopper voltage control unit while correcting the vibration of the induction motor due to the repetition of the regenerative state and the powering state based on the powering voltage fluctuation amount. A waveform calculating unit that performs the correction, the corrected basic frequency command value exceeding a predetermined base frequency, the output voltage of the boost chopper unit to the output voltage of the rectifying unit or more. This is a vibration reduction device in the air conditioner that is corrected.

According to the present invention, even when the reference for the change in the energy transferred between the step-up chopper and the power converter is biased, the change point of the transfer of energy can be accurately grasped. By monitoring the fluctuation range of the output voltage and reflecting the fluctuation range in the control, the fluctuation of the output voltage is reduced as a result. Further, even in a region where the operating frequency of the induction motor exceeds a predetermined base frequency, the step-up chopper is controlled. Since the output voltage of the unit can be controlled, the vibration generated in the compressor of the air conditioner can be reduced more accurately over the entire output range of the inverter device. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

According to a third aspect of the present invention, there is provided an air conditioner including an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and variable voltage AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. A minute detection unit, a boost chopper voltage control unit that controls an output voltage of the boost chopper unit, and a regenerative voltage fluctuation amount and a power running state corresponding to a regenerative state of the induction motor based on a pulse width and a timing of the pulse. A corresponding powering voltage fluctuation amount is calculated, and a basic frequency command value indicating an AC frequency output by the power conversion unit and the AC output voltage, and in the regenerative state, the regenerative voltage fluctuation amount, the powering The state includes, based on the power running voltage fluctuation amount, a waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration due to repetition of a regenerative state and a power running state of the induction motor, The operation unit is
In the correction, the output voltage of the step-up chopper is added to the output voltage of the rectifier and the maximum regenerative voltage variation calculated up to the present time for the corrected basic frequency command value exceeding a predetermined base frequency. This is a vibration reduction device in an air conditioner that corrects the voltage.

According to the present invention, even when the reference for the change in the energy transferred between the boosting chopper and the power converter is biased, the change point of the transfer of energy can be accurately grasped, and the induction In a region where the operating frequency of the motor exceeds a predetermined base frequency, the output voltage of the boost chopper is controlled by raising the output voltage of the boost chopper by the maximum regenerative voltage variation, thereby simplifying the control of the boost chopper voltage controller and controlling the output of the inverter device. Vibration generated in the compressor of the air conditioner can be reduced at low cost over the entire range. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

According to a fourth aspect of the present invention, there is provided an air conditioner including an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and voltage variable AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. And min Detection unit, a step-up chopper voltage control unit for controlling the output voltage of the boost chopper unit, a DC voltage detection unit for detecting an output voltage of the boost chopper unit,
The DC unit voltage fluctuation detection unit that detects the fluctuation range of the detected DC voltage, and compares the fluctuation width of the DC voltage with a predetermined DC unit fluctuation allowable value, and when the fluctuation width exceeds the DC unit fluctuation allowable value. A comparing unit that outputs a variation coefficient corresponding to the excess, a regenerative voltage variation corresponding to a regenerative state of the induction motor based on the pulse width and timing of the pulse, and the variation coefficient, and a powering voltage corresponding to a powering state. Calculate the amount of fluctuation, a basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the alternating current, the regenerative voltage fluctuation amount in the regenerative state, and the regenerative voltage fluctuation amount in the power running state. A waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration due to repetition of a regenerative state and a powering state of the induction motor based on the powering voltage fluctuation amount; In the correction, with respect to the corrected basic frequency command value exceeding a predetermined base frequency, the output voltage of the step-up chopper is calculated by comparing the output voltage of the rectifying unit with the output voltage of the rectifier and the maximum regenerative voltage variation calculated up to the present time. This is a vibration reduction device in an air conditioner that corrects the addition voltage.

According to the present invention, even when the reference for the change in the energy transferred between the step-up chopper unit and the power conversion unit is biased, the change point in the transfer of energy can be accurately grasped. By monitoring the fluctuation range of the output voltage and reflecting the fluctuation range in the control, the fluctuation of the output voltage is reduced as a result. Further, in a region where the operating frequency of the induction motor exceeds a predetermined base frequency, the step-up chopper is controlled. By increasing the output voltage of the unit by the maximum regenerative voltage fluctuation and controlling it, the control of the boost chopper voltage control unit is simplified, and the vibration generated in the compressor of the air conditioner with higher accuracy over the entire output range of the inverter device. Can be reduced. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention according to the first aspect, the step-up chopper section means a means for converting a DC voltage output from a rectifier section into an arbitrary DC voltage and outputting the DC voltage. It is characterized in that it can be output after being boosted to a DC voltage, that is, a rectified voltage or higher. This makes it possible to correct the DC voltage applied to the power converter to a level equal to or higher than the rectified voltage. The power converter means means for converting a DC voltage into an AC voltage having a variable frequency and a variable voltage, and outputting the AC voltage. The configuration is not particularly limited, but means capable of variably controlling the frequency and voltage of the AC output by PWM control. And The voltage fluctuation detecting section means a means for detecting a change in energy transferred between the output of the boost chopper section and the power conversion section as a voltage fluctuation. In the embodiment, the voltage fluctuation detecting section includes the boost chopper section and the power conversion section. Detected by the voltage across the fixed resistor inserted between The voltage includes an average voltage corresponding to an average power output from the boost chopper to the power converter, and a voltage variation corresponding to a power variation associated with a regenerative state and a power running state of the induction motor.

The fluctuation detecting section means means for extracting only the voltage fluctuation as an AC component. In the embodiment, the output of the voltage fluctuation detecting section is taken out via a capacitor, and the output is compared with the average voltage by a comparator. Then, a means for outputting a pulse corresponding to the voltage fluctuation is provided. The switching of the pulse corresponds to the switching between the regenerative state and the power running state, and the pulse width corresponds to the frequency of the change in switching between the regenerative state and the power running state. The timing means the timing of the regenerative state and the powering state.

The waveform calculation section essentially means means for controlling the power conversion section. In the present invention according to claim 1, the output voltage V of the step-up chopper section and the output voltage of the power conversion section are controlled. While controlling the frequency F and maintaining the V / F ratio constant, the output voltage V and the frequency F are changed on the basis of the voltage fluctuations so that the booster chopper reference voltage command value, which is the original command value, and the fundamental frequency. By correcting the command value, control is performed in a direction to suppress the regenerative state and the power running state of the induction motor. At this time, according to a predetermined relationship from the pulse width of the pulse, a regenerative frequency fluctuation amount and a power running frequency fluctuation amount for correcting the basic frequency command value are calculated, and a regenerative voltage fluctuation amount for correcting the output voltage of the boost chopper unit. The powering voltage fluctuation amount is calculated from the V / F ratio according to the regenerative frequency fluctuation amount and the powering frequency fluctuation amount.

The predetermined base frequency means a frequency determined by a constant V / F relationship when the output voltage of the step-up chopper is equal to the rectified voltage. Therefore, when the corrected basic frequency command value exceeds the base frequency, the output voltage of the boost chopper section is corrected to be higher than the rectified voltage.

In the present invention according to claim 2, the DC voltage detecting section means means for detecting the output voltage of the step-up chopper section, and the configuration is not limited. The DC section voltage fluctuation detecting section means means for detecting a fluctuation width in the DC voltage detected by the DC voltage detecting section, and the configuration is not limited. The comparison unit means means for outputting a variation coefficient given in a predetermined relationship with respect to an excess exceeding a predetermined DC portion variation allowable value in accordance with the variation range of the DC voltage. A variation coefficient that is proportional to the excess exceeding the allowable portion variation value is output, and is set to 1.0 when the variation portion is equal to or less than the allowable DC portion variation value, but is not limited thereto. This variation coefficient reflects the variation of the output voltage of the boost chopper section in the regenerative voltage variation and the powering voltage variation, and the variation coefficient of the regenerative voltage variation and the powering voltage variation in the present invention according to claim 1. By multiplying them by each other, and when the fluctuation of the DC voltage of the boost chopper is larger than the DC part fluctuation allowable value, by increasing the correction in proportion to the magnitude of the fluctuation, the DC voltage of the boost chopper is consequently increased. It is intended to act as feedback to suppress fluctuations and to suppress vibration more effectively.

According to the third and fourth aspects of the present invention, the control of the waveform calculation section is performed by the first and second aspects.
In contrast to the present invention, the correction of the DC voltage and the correction of the frequency performed in accordance with the amount of frequency fluctuation are both performed only by the power converter, and the output voltage of the boost chopper is not corrected in principle. However, only when the corrected basic frequency command value exceeds the base frequency, the maximum regenerative voltage fluctuation amount up to the present time is added and increased. Other configurations are the same as those of the first and second aspects.

Hereinafter, embodiments of the present invention will be described.

[0023]

(Embodiment 1) Hereinafter, Embodiment 1 of a vibration reduction device in an air conditioner of the present invention will be described with reference to the drawings. This embodiment relates to claim 1.

FIG. 1 is a block diagram showing the configuration of the inverter device according to this embodiment. In FIG. 1, 1 is a three-phase AC power supply, 2 is a reactor inserted in series with the three-phase AC power supply 1, 3 is an inverter device, and 4 is an induction motor that drives a compressor. In the inverter device 3, 5 is a rectifier for rectifying three-phase AC, 6 is a boost chopper for boosting a DC voltage output from the rectifier 5, and 7 is a DC power supply composed of the rectifier 5 and the boost chopper 6. A power conversion unit 8 for converting a DC voltage output from the DC power supply unit 7 into an AC voltage having a variable frequency; and a voltage fluctuation detection unit 9 for detecting a voltage fluctuation between the DC power supply unit 7 and the power conversion unit 8. Reference numeral 10 denotes a fluctuation detecting section for detecting a fluctuation in the voltage fluctuation detected by the voltage fluctuation detecting section 9, and reference numeral 11 denotes a waveform for controlling the power conversion section 8 corresponding to the base frequency, the basic frequency command value, and the fluctuation. Is a step-up chopper voltage control section that controls the step-up chopper section 6 in accordance with the step-up chopper reference voltage command value and the variation.

FIG. 2 is a block diagram showing the configuration of the voltage fluctuation detecting section 9. As shown in FIG.
Is connected between the DC power supply unit 7 and the power conversion unit 8, converts a change in current into a change in voltage by, for example, a fixed resistor 9a, and then amplifies the change by an amplifier 9b. By removing the frequency component, the fluctuation in the voltage fluctuation is detected.

The operation of the above configuration will be described.
FIG. 3 is a waveform diagram showing an operation of the voltage fluctuation detection unit 9 when vibration occurs. 3A shows a voltage generated in the fixed resistor 9a, and FIG. 3B shows an output of the low-pass filter 9c. FIG. 3C shows the output of the fluctuation detecting unit 10. In FIG. 3A,
A positive voltage indicates a regenerative state in which the inverter device 3 is being turned by the induction motor 4, and a negative voltage indicates a power running state in which the inverter device 3 is turning the induction motor 4 too much. In addition, the output of FIG.
The voltage fluctuation shown in (a) is obtained as an AC component superimposed on a DC component. The center of the amplitude of the AC component is the average voltage corresponding to the average power. The output of the voltage fluctuation detecting section 9 is input to the fluctuation detecting section 10.

FIG. 4 is a block diagram showing the configuration of the variation detecting section 10. As shown in FIG. In FIG. 4, 10a is a capacitor, 1
0b and 10c are fixed resistors, and 10d is a comparator. In the fluctuation detecting section 10, only the AC component is extracted from the output of the voltage fluctuation detecting section 9 by the capacitor 10a, and pulse-shaped by the comparator 10d as shown in FIG. Output. With this configuration, even when the reference of the voltage fluctuation is not uniform, it is possible to accurately detect a change point with respect to the average voltage. This change point corresponds to the change point of the average power.
The output of the fluctuation detecting section 10 is input to the waveform calculating section 11.

Hereinafter, the operation of the waveform calculator 11 will be described with reference to the drawings. FIG. 5 is a flowchart showing the operation of the waveform calculator 11.

First, in step 1, it is confirmed whether or not the measurement between the edges of the input pulse from the variation detecting section 10 has been completed. If the measurement has not been completed, the process proceeds to step 5, but if the measurement has been completed in step 1, the process proceeds to step 2 to check the current input of the waveform calculation unit 11. Here, since the input of the waveform calculation unit 11 is a pulse, if the current time is Hi, since the measurement has been completed before that time, the measurement target between the edges is L.
ow level section. Similarly, if the input of the waveform calculation unit 11 is Low at the present time, the measurement has been completed before that time, and the target of the inter-edge measurement is the Hi-level section.

If the input pulse is Hi, the flow goes to step 3 to store the measurement result as data at the time of regeneration, calculate the frequency fluctuation amount at the time of regeneration in accordance with the relationship shown in FIG. I do. When the input pulse is Low
If so, the process proceeds to step 4 to store the measurement result as powering data, and similarly calculates the frequency variation during powering from the measured pulse width according to the relationship in FIG. Move to In step 5, the current state of the input pulse is monitored to detect a falling edge. Thus, a change point between the powering state and the regenerative state is detected.

If a falling edge is detected in step 5, the process proceeds to step 6, where the basic frequency command value is changed according to the following equation. Basic frequency command value ← Basic frequency command value + Regenerative frequency fluctuation amount Next, proceed to step 7 to compare the basic frequency command value with the base frequency. If the basic frequency command value is less than the base frequency, proceed to step 8 I do. In step 8, since the vibration reduction control by the step-up chopper is not necessary, the following equation is calculated and the process is terminated. Regenerative voltage fluctuation = 0 In step 7, when the basic frequency command value is equal to or higher than the base frequency, the process proceeds to step 9, and the regenerative voltage fluctuation output to the boost chopper voltage controller 12 is calculated according to the following equation. Regenerative voltage fluctuation = regenerative frequency fluctuation × unit change voltage Here, the unit change voltage is, for example, 1
It is a voltage value per Hz, which is an amount corresponding to the slope of V / F.

If the falling edge has not been detected in step 5, the process proceeds to step 10 to detect the rising edge. If a rising edge is detected, the process proceeds to step 11 to change the basic frequency command value according to the following equation. Fundamental frequency command value ← Fundamental frequency command value−power running frequency fluctuation amount Here, if the rising edge cannot be detected, the process ends. If detected, the process proceeds to step 12, and the basic frequency command value is set to the base frequency. If the basic frequency command value is lower than the base frequency, the process proceeds to step S14.

In step 14, since the vibration reduction control by the step-up chopper is not necessary, the following equation is calculated and the processing is terminated. Powering voltage fluctuation amount = 0 If the basic frequency command value is equal to or higher than the base frequency in step 12, the process proceeds to step 13, and the powering voltage fluctuation amount output to the boost chopper voltage control unit 12 is calculated according to the following equation. Power running voltage fluctuation amount = power running frequency fluctuation amount × unit change voltage By the above processing, the waveform calculation unit 11 calculates the regenerative voltage fluctuation amount and the power running voltage fluctuation amount. Note that the process from the determination of the basic frequency command value to the output of the PWM signal is a general content, and thus the description is omitted. In addition, the change from the current frequency to the newly calculated fundamental frequency command value is smoothly accelerated / decelerated at a predetermined rate.

Next, the boost chopper voltage controller 12 will be described. The boost chopper voltage control unit 12 adds or subtracts the regenerative voltage fluctuation amount or the powering voltage fluctuation amount calculated by the waveform calculation unit 11 to the boost chopper reference voltage command value to determine a target voltage. FIG. 7 is a flowchart showing the operation of the boosting chopper section 6 in the present embodiment. As described below, the output voltage of the boost chopper section 6 is smoothly changed according to the target voltage.

First, in step 1, it is confirmed whether or not it is the timing of the power running control. If it is the timing of the power running control, the process proceeds to step 2, and if it is not the timing of the power running control, the process proceeds to step 4. In step 2, it is checked whether or not the current output voltage has reached the target voltage during power running control. If it has arrived, the process ends. If it has not arrived, the process proceeds to step 3. In step 3, the output voltage is updated according to the following equation, and then the processing is terminated. Step-up output voltage = Step-up chopper reference voltage command value-unit change voltage If it is not the timing of powering control, step 4
Move to In step 4, it is confirmed whether or not the current output voltage has reached the target voltage in the regenerative state.
If it has arrived, the process ends, and if it has not arrived, the process proceeds to step 5. In step 5, the output voltage is updated in accordance with the following equation, and the process is terminated. Step-up output voltage = step-up chopper reference voltage command value + unit change voltage By repeating the above processing, the inverter device 3 is being turned by the induction motor 4 at the time of regeneration. The output frequency and the output voltage are increased, and at the time of power running, the inverter device 3 is rotating the induction motor 4 excessively.
By lowering the output frequency and output voltage of the inverter device 3 so as to cancel them, fluctuations in the energy of the boost chopper unit 6 and the power conversion unit 8 are suppressed, and a stable state is achieved over the entire operating frequency range of the inverter device 3. At the same time, vibration generated in the compressor can be reduced.

As described above, according to the present embodiment, the fluctuation in the voltage fluctuation between the DC power supply unit 7 and the power conversion unit 8 is extracted as an AC component, so that the voltage fluctuation is either regenerative or power running. The change point can be accurately detected even if the AC component is biased, and the fundamental frequency and the output voltage of the boost chopper are induced at the time of regeneration and at the time of power running, respectively, based on the pulse width of the pulse obtained by shaping the waveform of the AC component. By performing control while correcting the rotation of the electric motor 4 in the direction of canceling the vibration, the vibration generated in the compressor can be reduced stably, and the above operation can be performed up to the base frequency or higher. Can be reduced.

(Embodiment 2) Hereinafter, Embodiment 2 of a vibration reduction device for an air conditioner of the present invention will be described with reference to the drawings. This embodiment relates to claim 2.

FIG. 8 shows an inverter device 3 according to this embodiment.
FIG. 3 is a block diagram showing the configuration of FIG. The same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. In FIG. 8, reference numeral 13 denotes a DC voltage detection unit that detects a DC voltage output from the DC power supply unit 7, 14 denotes a DC unit voltage fluctuation detection unit that detects a fluctuation in the DC voltage, and 15 denotes a fluctuation in the DC voltage. A comparison unit for comparing with an allowable value.

This embodiment is different from the first embodiment in that the waveform calculator 11 calculates the regenerative voltage fluctuation and the powering voltage fluctuation by taking into account the fluctuation of the DC voltage output from the DC power supply 7. It is to have done. Other operations are the same as in the first embodiment.

The operation in the above configuration will be described with reference to the drawings. FIG. 9 is a flowchart showing the operation of the waveform calculator 11 in the present embodiment. In the flowchart shown in FIG. 5 of the first embodiment, the processing is the same except for the case where the determination result of step 7 is YES and the case where the determination result of step 12 is YES. .

If the basic frequency command value is equal to or higher than the base frequency in step 7, the process proceeds to step 9. Step 9
Then, the regenerative voltage fluctuation output to the boost chopper voltage controller 12 is calculated according to the following equation. Regenerative voltage fluctuation amount = fluctuation coefficient × regenerative frequency fluctuation amount × unit change voltage Here, the fluctuation coefficient is when the fluctuation range of the DC voltage during the vibration reduction control exceeds the DC part fluctuation allowable value. FIG. 10 shows the relationship between the variation width of the DC voltage and the variation coefficient.

If it is determined in step 12 that the basic frequency command value is equal to or higher than the base frequency, the process proceeds to step 13. In step 13, the power running voltage fluctuation amount to be output to the boost chopper voltage control unit 12 is calculated according to the following equation. Power running voltage fluctuation amount = Variation coefficient × Power running frequency fluctuation amount × Unit change voltage By the above processing, the waveform calculation unit 11 calculates the regenerative voltage fluctuation amount and the regenerative voltage fluctuation amount. Note that the process from the determination of the basic frequency command value to the output of the PWM signal is a general content, and thus the description is omitted. Also,
The change from the current frequency to the newly calculated basic frequency command value is smoothly accelerated / decelerated at a predetermined rate.

Next, the operation of the DC voltage detector 13 to the comparator 15 will be described. DC voltage change detector 1
In step 4, the maximum voltage and the minimum voltage are detected from the output of the DC voltage detection unit 13, the fluctuation range of the DC voltage is calculated from the detected values, and output to the comparison unit 15. The comparison unit 15 compares the fluctuation range of the DC voltage with a predetermined DC unit fluctuation allowable value, and when the fluctuation range of the DC voltage exceeds the DC unit fluctuation allowable value, changes the fluctuation coefficient according to the relationship in FIG. Output to the arithmetic unit 11. If the fluctuation range of the DC voltage is equal to or smaller than the DC part fluctuation allowable value, the fluctuation coefficient is set to 1 and output to the waveform calculation unit 11.

By repeating the above processing, the inverter device 3 is turned by the induction motor 4 at the time of regeneration.
The output frequency and the output voltage of the inverter device 3 are increased by increasing the output frequency and the output voltage of the inverter device 3 during power running. , The fluctuation of the energy of the boost chopper section 6 and the power conversion section 8 is suppressed,
A stable state can be achieved over the entire operating frequency range of the inverter device 3, and vibration generated in the compressor can be reduced.

Further, by feeding back the fluctuation of the DC voltage by the DC voltage detection unit 13, the fluctuation range of the voltage used for the vibration reduction control is corrected so that the vibration converges, thereby providing a more accurate vibration reduction control. Can be performed.

As described above, according to the present embodiment, the regenerative voltage fluctuation amount and the power running voltage fluctuation amount are controlled to be large based on the fluctuation width of the output DC voltage of the DC power supply unit 7, whereby the first embodiment is controlled. Vibration can be reduced with higher accuracy than the configuration.

(Embodiment 3) Hereinafter, Embodiment 3 of a vibration reduction device in an air conditioner of the present invention will be described with reference to the drawings.

FIG. 11 is a block diagram showing the configuration of the inverter device 3 in this embodiment. The configuration of this embodiment is the same as that of the first embodiment when shown in a block diagram.

This embodiment is different from the first embodiment in that, when the basic frequency command value corrected in response to the voltage fluctuation exceeds the base frequency, the boosted output voltage of the boost chopper section 6 is changed to the maximum regenerative value up to the present time. The amount of voltage fluctuation is fixed, and the frequency of the inverter device 3 and the output voltage are changed by the processing of the waveform calculation unit 11 to reduce the vibration of the induction motor 4. Therefore, boost chopper voltage control unit 1
2 is simplified.

The operation in the above configuration will be described with reference to the drawings. FIG. 12 is a flowchart showing the operation of the waveform calculator 11 in the present embodiment. FIG.
In 2, the processing up to the fluctuation detecting unit 10 is the same as in the first embodiment, and the description is omitted. In addition, the processes up to Steps 8 and 9 and Steps 13 and 14 are the same as those in the first embodiment, and a description thereof will be omitted.

In step 15, the maximum value of the regenerative voltage fluctuation calculated each time in step 9 is determined. The regenerative voltage fluctuation calculated this time is compared with the previous maximum regenerative voltage fluctuation. If the regenerative voltage fluctuation is equal to or greater than the maximum regenerative voltage fluctuation, the process proceeds to step 16 to update the maximum regenerative voltage fluctuation. Then, the process proceeds to step S17. If the regenerative voltage fluctuation is less than the maximum regenerative voltage fluctuation, the process proceeds to step S17. In step 17, a phase update process and output voltage data acquisition are performed.
Move to 8. The processing in step 17 is a general processing in an inverter device controlled by a PWM waveform, and thus the description is omitted.

In step 18, the DC voltage increased by the boost chopper section 6 is corrected according to the following equation.
Move to 9. Step-up output voltage = Step-up chopper reference voltage command value + maximum regenerative voltage fluctuation amount In step 19, it is checked whether or not the current frequency has reached the basic frequency command value. If it has arrived, the process ends. If it has not arrived, the process proceeds to step 20. In step 20, the output voltage is changed in accordance with the following equation, and the process ends. Output voltage ← output voltage−unit change voltage Next, processing at the time of power running will be described. Step 21
Then, as in the case of the regeneration, the phase update processing and the acquisition of the output voltage data are performed, and the process proceeds to step S22. Step 2
In step 2, as in the case of the regeneration, the DC voltage increased by the boost chopper section 6 is corrected according to the following equation, and the process proceeds to step S23. Step-up output voltage = Step-up chopper reference voltage command value + maximum regenerative voltage fluctuation amount The reason why the maximum regenerative voltage fluctuation amount is used even during power running is that it is corrected as a guide.

In step 23, it is confirmed whether or not the current frequency has reached the basic frequency command value. If it has arrived, the process ends, and if it has not arrived, the process proceeds to step S24. In step 24, the output voltage is changed in accordance with the following equation, and the process ends. Output voltage ← output voltage + unit change voltage Next, the boost chopper voltage control unit 12 shown in FIG. 12 will be described. FIG. 13 shows the step-up chopper voltage controller 12.
6 is a flowchart showing the operation of the first embodiment. In step 1, it is determined whether or not the vibration reduction control is currently being performed. If the vibration reduction control is being performed, proceed to step 2,
If the vibration reduction control is not being performed, the process proceeds to step 3.
In Step 2, the boost chopper reference voltage command value is changed according to the following equation to change the output voltage of the boost chopper section 6, and the operation is completed. Step-up chopper reference voltage command value ← step-up chopper reference voltage command value + maximum regenerative voltage fluctuation amount If it is determined in step 1 that no vibration has occurred, the process proceeds to step 3. In step 3, since no vibration has occurred, the boost chopper reference voltage command value is returned to the original boost chopper reference voltage command value, and the process ends.
The process of generating a pulse for driving the boost chopper unit 6 by the boost chopper voltage control unit 12 is a general process, and a description thereof will be omitted.

By repeating the above processing, the voltage of the DC power supply unit 7 is increased to the minimum necessary, so that the inverter 3 is rotated by the induction motor 4 during regeneration over the entire operating frequency range of the inverter 3. Therefore, the output frequency and the output voltage of the inverter device 3 are increased so as to cancel them.
Is in a state in which the induction motor 4 is being turned too much, and by lowering the output frequency and the output voltage of the inverter device 3 so as to cancel them, fluctuations in the energy of the boost chopper unit 6 and the power conversion unit 8 are suppressed, A stable state can be achieved, and vibration generated in the compressor can be reduced.

Further, in the boost chopper 6, the minimum voltage is increased by the vibration reduction control, and the fine control for reducing the vibration is performed by the waveform calculator 11, so that the control of the boost chopper 6 is simplified. Can be

As described above, according to the present embodiment, the maximum regenerative voltage fluctuation of the regenerative voltage fluctuation is constantly updated and changed in accordance with the voltage fluctuation between the DC power supply unit 7 and the power conversion unit 8. When the basic frequency command value exceeds the base frequency, the boost output voltage of the boost chopper section 6 is corrected by the maximum regenerative voltage fluctuation, and the frequency and output voltage of the inverter device 3 are changed based on the boost output voltage. By controlling the induction motor 4 in a direction to cancel the regenerative state or the powering state of the induction motor 4, the vibration generated in the compressor can be reduced and the processing of the step-up chopper section 6 can be simplified.

(Embodiment 4) Hereinafter, Embodiment 4 of the vibration reduction device in the air conditioner of the present invention will be described with reference to the drawings. This embodiment relates to claim 4.

FIG. 14 is a block diagram showing the configuration of the inverter device 3 in this embodiment. When the configuration of the present embodiment is shown in a block diagram, it is the same as that of FIG. 8 of the third embodiment, and the same components are assigned the same reference numerals and detailed description is omitted. This embodiment is different from the third embodiment in that, in the control of the waveform calculation unit 11, as in the second embodiment, a variation coefficient corresponding to the variation range of the DC voltage of the boost chopper unit 6 is added.

The operation of the above configuration will be described with reference to the drawings. FIG. 15 is a flowchart illustrating the operation of the waveform calculation unit 11 in the present embodiment. In addition,
In FIG. 15, the processing up to the fluctuation detecting unit 10 is the same as in the first embodiment, and a description thereof will be omitted. Except for step 9 and step 13, the third embodiment is the same as the third embodiment, and the description is omitted.

In step 9, the amount of change in the regenerative voltage is calculated according to the following equation. Regenerative voltage fluctuation amount = Variation coefficient × Regeneration frequency fluctuation amount × Unit change voltage In step 13, the powering voltage fluctuation amount is calculated according to the following equation. Power running voltage fluctuation amount = Variation coefficient × Power running frequency fluctuation amount × Unit change voltage The fluctuation coefficient is the same as the fluctuation coefficient in the third embodiment. Further, the boost chopper voltage control unit 12 has the same contents as those described in the third embodiment, and thus the description is omitted. The process from the detection of the DC voltage by the DC voltage detector 13 to the calculation of the variation coefficient by the comparator 15 is the same as in the second embodiment. That is, in the present embodiment, control accuracy for vibration is improved by adding voltage feedback to the third embodiment.

By repeating the above-described processing, the voltage of the DC power supply unit is increased to the required minimum, so that the inverter device 3 can be regenerated during regeneration over the entire operating frequency range.
Is being turned by the induction motor 4, so that the frequency and output voltage of the inverter device 3 are increased so as to cancel them, and at the time of power running, the inverter device 3 is turning the induction motor 4 too much. Therefore, by lowering the frequency and the output voltage of the inverter device 3 so as to cancel them, fluctuations in the energy of the boost chopper unit 6 and the power conversion unit 8 are suppressed, and a stable state is obtained. Can be reduced.

Only when the corrected basic frequency command value exceeds the base frequency, similarly to the third embodiment, the boost output voltage of the boost chopper section 6 is increased by the minimum necessary maximum regenerative voltage fluctuation to reduce vibration. Since the waveform calculation unit 11 is in charge of detailed control for performing the operation, the boost chopper voltage control unit 12
Can be simplified.

Further, as in the second embodiment, by feeding back the fluctuation of the DC voltage output from the boosting chopper section 6, more accurate vibration reduction control can be performed.

As described above, according to this embodiment, the regenerative voltage fluctuation amount and the power running voltage are determined based on the voltage fluctuation between the DC power supply unit 7 and the power conversion unit 8 and the DC voltage fluctuation of the DC power supply unit 7. If the fundamental frequency command value corrected based on them exceeds the base frequency, the boost output voltage of the boost chopper is fixed and increased according to the maximum regenerative voltage change amount up to the present, and the boost output is calculated. By controlling the frequency and output voltage based on the voltage in a direction to cancel the regenerative state and the powering state of the induction motor, respectively, the processing of the step-up chopper voltage control unit can be performed while effectively reducing the vibration of the induction motor. Can be simplified.

[0065]

According to the first aspect of the present invention, there is provided an air conditioner having an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies frequency-variable and voltage-variable AC power to an induction motor. In the apparatus, the inverter device includes: a rectifier that rectifies an AC voltage of the three-phase AC power supply; a boost chopper that converts a DC voltage output by the rectifier into an arbitrary DC voltage and outputs the DC voltage; A power converter for converting a DC voltage output by the unit into a frequency-variable and voltage-variable AC voltage; and a voltage change detecting a change in energy transferred between the boost chopper and the power converter as a voltage change. A detection unit that extracts only an AC component in an output of the voltage fluctuation detection unit, and outputs pulses corresponding to a large portion and a small portion compared to the average voltage; A motion detection unit, a boost chopper voltage control unit that controls an output voltage of the boost chopper unit, and a regenerative voltage fluctuation amount and a power running state corresponding to a regenerative state of the induction motor based on a pulse width and a timing of the pulse. And a basic frequency command value indicating the frequency of the alternating current output by the power converter and the output voltage of the boost chopper, and the regenerative voltage fluctuation in the regenerative state. In the powering state, based on the powering voltage fluctuation amount, the power conversion unit and the boost chopper voltage control unit while correcting in a direction to reduce vibration due to repetition of the regenerative state and the powering state of the induction motor. And a waveform calculating unit for controlling the boosting choke corresponding to the corrected basic frequency command value exceeding a predetermined base frequency in the correction. With the vibration reduction device in the air conditioner configured to correct the output voltage of the power supply unit to a range equal to or more than the output voltage of the rectification unit, fluctuations in energy transferred between the DC power supply unit and the power conversion unit can be reduced. In order not to judge by polarity, but to control by finding fluctuations as a whole, even if the standard is uneven, energy fluctuations can be accurately grasped and low cost by using fixed resistors as detectors. At the same time, even in a region where the operating frequency of the induction motor exceeds the base frequency, the vibration reduction control can be performed by controlling the boost chopper, and the vibration generated in the compressor of the air conditioner is reduced. In the region above the base frequency, the voltage of the DC power supply is increased by the necessary amount only when necessary, so that the life of the smoothing capacitor is not affected and reliability is improved. It is possible to make it high.

According to a second aspect of the present invention, there is provided an air conditioner having an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and voltage variable AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. And min Detection unit, a step-up chopper voltage control unit for controlling the output voltage of the boost chopper unit, a DC voltage detection unit for detecting an output voltage of the boost chopper unit,
The DC unit voltage fluctuation detection unit that detects the fluctuation range of the detected DC voltage, and compares the fluctuation width of the DC voltage with a predetermined DC unit fluctuation allowable value, and when the fluctuation width exceeds the DC unit fluctuation allowable value. A comparing unit that outputs a variation coefficient corresponding to the excess, a regenerative voltage variation corresponding to a regenerative state of the induction motor based on the pulse width and timing of the pulse, and the variation coefficient, and a powering voltage corresponding to a powering state. Calculate the amount of fluctuation, the basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the boost chopper unit, the regenerative voltage fluctuation amount in the regenerative state, the power running state Controls the power conversion unit and the step-up chopper voltage control unit while correcting the vibration of the induction motor due to the repetition of the regenerative state and the powering state based on the powering voltage fluctuation amount. A waveform calculating unit that performs the correction, the corrected basic frequency command value exceeding a predetermined base frequency, the output voltage of the boost chopper unit to the output voltage of the rectifying unit or more. By using the vibration reducing device in the air conditioner that is corrected, even when the reference of the change in the energy transferred between the boost chopper unit and the power conversion unit is biased, the change point of the transfer of the energy is changed. It can be accurately grasped, and the fluctuation width of the output voltage is monitored, and the fluctuation width is reflected in the control to reduce the fluctuation of the output voltage as a result. Since the output voltage of the step-up chopper can be controlled even in a region exceeding the base frequency, the empty space can be more accurately evacuated over the entire output range of the inverter device. It is possible to reduce the vibration generated in the compressor of the conditioner. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

According to a third aspect of the present invention, there is provided an air conditioner having an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and voltage variable AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. A minute detection unit, a boost chopper voltage control unit that controls an output voltage of the boost chopper unit, and a regenerative voltage fluctuation amount and a power running state corresponding to a regenerative state of the induction motor based on a pulse width and a timing of the pulse. A corresponding powering voltage fluctuation amount is calculated, and a basic frequency command value indicating an AC frequency output by the power conversion unit and the AC output voltage, and in the regenerative state, the regenerative voltage fluctuation amount, the powering The state includes, based on the power running voltage fluctuation amount, a waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration due to repetition of a regenerative state and a power running state of the induction motor, The operation unit is
In the correction, the output voltage of the step-up chopper is added to the output voltage of the rectifier and the maximum regenerative voltage variation calculated up to the present time for the corrected basic frequency command value exceeding a predetermined base frequency. By using a vibration reduction device in the air conditioner that corrects the voltage, the change in energy transfer between the boost chopper unit and the power conversion unit even when the reference for the change in energy transferred between the step-up chopper unit and the power conversion unit is biased. In the region where the operating frequency of the induction motor exceeds a predetermined base frequency, the output voltage of the boost chopper is controlled by increasing the maximum regenerative voltage fluctuation, thereby controlling the boost chopper voltage. Reduces vibration generated in the compressor of the air conditioner at low cost over the entire output range of the inverter while simplifying control of the control unit It can be. Further, the output voltage of the boost chopper section is increased only in the region equal to or higher than the base frequency and as necessary, so that the life of the smoothing capacitor provided in the boost chopper section is not affected and high reliability can be obtained. .

According to a fourth aspect of the present invention, there is provided an air conditioner having an inverter device which receives AC power from a three-phase AC power supply via a reactor and supplies variable frequency and voltage variable AC power to the induction motor. A rectifying unit that rectifies an AC voltage of the three-phase AC power supply, a boost chopper unit that converts a DC voltage output by the rectifying unit into an arbitrary DC voltage and outputs the DC voltage, and a boost chopper unit. A power conversion unit for converting a DC voltage to be output into a frequency-variable and voltage-variable AC voltage, and a voltage fluctuation detection unit for detecting a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change And extracting only the AC component in the output of the voltage fluctuation detecting unit, and outputting pulses corresponding to a large portion and a small portion compared to the average voltage. And min Detection unit, a step-up chopper voltage control unit for controlling the output voltage of the boost chopper unit, a DC voltage detection unit for detecting an output voltage of the boost chopper unit,
The DC unit voltage fluctuation detection unit that detects the fluctuation range of the detected DC voltage, and compares the fluctuation width of the DC voltage with a predetermined DC unit fluctuation allowable value, and when the fluctuation width exceeds the DC unit fluctuation allowable value. A comparing unit that outputs a variation coefficient corresponding to the excess, a regenerative voltage variation corresponding to a regenerative state of the induction motor based on the pulse width and timing of the pulse, and the variation coefficient, and a powering voltage corresponding to a powering state. Calculate the amount of fluctuation, a basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the alternating current, the regenerative voltage fluctuation amount in the regenerative state, and the regenerative voltage fluctuation amount in the power running state. A waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration due to repetition of a regenerative state and a powering state of the induction motor based on the powering voltage fluctuation amount; In the correction, with respect to the corrected basic frequency command value exceeding a predetermined base frequency, the output voltage of the step-up chopper is calculated by comparing the output voltage of the rectifying unit with the output voltage of the rectifier and the maximum regenerative voltage variation calculated up to the present time By providing a vibration reduction device in the air conditioner that is corrected to the added voltage, energy transfer between the boost chopper unit and the power conversion unit can be performed even when the reference for the change in energy transferred between the boost chopper unit and the power conversion unit is not uniform. The point of change can be accurately grasped, and the fluctuation range of the output voltage is monitored, and the fluctuation range of the output voltage is reduced by reflecting the fluctuation range in the control, and further, the operating frequency of the induction motor is reduced. In a region where the voltage exceeds the predetermined base frequency, the output voltage of the boost chopper section is controlled by increasing the maximum regenerative voltage fluctuation amount, thereby controlling the boost chopper. Over the output range the entire region of the inverter apparatus while simplifying the control of the voltage control unit, it is possible to reduce the vibration generated more compressor accurately the air conditioner. Further, since the output voltage of the boosting chopper section is increased only in a region equal to or higher than the base frequency and as necessary, the output voltage of the smoothing capacitor provided in the boosting chopper section is not affected and the reliability can be increased. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an inverter device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a voltage fluctuation detection unit in the embodiment.

FIG. 3 is a waveform chart showing an operation of a voltage fluctuation detecting unit in the embodiment.

FIG. 4 is a block diagram showing a configuration of a variation detecting unit in the embodiment.

FIG. 5 is a flowchart showing the operation of a waveform calculation unit in the embodiment.

FIG. 6 is a characteristic diagram showing a relationship between a pulse width of an input pulse and a frequency fluctuation amount in the embodiment.

FIG. 7 is a flowchart showing the operation of the boost chopper voltage control unit in the embodiment.

FIG. 8 is a block diagram illustrating a configuration of an inverter device according to a second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the inverter device in the embodiment.

FIG. 10 is a characteristic diagram showing a relationship between a variation range of a DC voltage and a variation coefficient in the embodiment.

FIG. 11 is a block diagram illustrating a configuration of an inverter device according to a third embodiment of the present invention.

FIG. 12 is a flowchart showing the operation of the waveform calculation unit in the embodiment.

FIG. 13 is a flowchart showing the operation of the boost chopper voltage control unit in the embodiment.

FIG. 14 is a block diagram illustrating a configuration of an inverter device according to a fourth embodiment of the present invention.

FIG. 15 is a flowchart showing the operation of the waveform calculator in the embodiment.

FIG. 16 is a waveform diagram showing a current flowing between a DC power supply unit and a power conversion unit during oscillation in a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 three-phase AC power supply 2 reactor 3 inverter 4 induction motor 5 rectifier 6 step-up chopper 7 DC power supply 8 power converter 9 voltage fluctuation detector 9 a fixed resistor 9 b amplifier 9 c low-pass filter 10 fluctuation detector 10 a capacitor 10 b , 10c Fixed resistor 10d Comparator 11 Waveform calculation unit 12 Boost chopper voltage control unit 13 DC voltage detection unit 14 DC unit voltage fluctuation detection unit 15 Comparison unit

Claims (4)

[Claims] 1. An air conditioner including an inverter device that receives AC power from a three-phase AC power supply via a reactor and supplies frequency-variable and voltage-variable AC power to an induction motor, wherein the inverter device includes: A rectifier for rectifying the AC voltage of the three-phase AC power supply, a boost chopper for converting a DC voltage output by the rectifier into an arbitrary DC voltage and outputting the DC voltage, and a frequency variable for the DC voltage output by the boost chopper; A power conversion unit that converts a voltage into a variable AC voltage; a voltage fluctuation detection unit that detects a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change; and the voltage fluctuation detection unit. A fluctuation detecting section for extracting only an AC component in the output of the comparator and outputting pulses corresponding to a large portion and a small portion as compared with the average voltage; A step-up chopper voltage control unit that controls an output voltage of the induction motor; a regenerative voltage variation corresponding to a regenerative state of the induction motor based on a pulse width and a timing of the pulse; And a basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the boost chopper unit, the regenerative voltage fluctuation amount in the regenerative state, and the regenerative voltage fluctuation amount in the power running state. A waveform calculating unit that controls the power conversion unit and the boost chopper voltage control unit while correcting in a direction to reduce vibration caused by repetition of the regenerative state and the powering state of the induction motor based on the powering voltage fluctuation amount. The waveform calculating unit includes: in the correction, the output voltage of the step-up chopper unit corresponding to the corrected basic frequency command value exceeding a predetermined base frequency in the rectifying unit. Vibration relief apparatus in an air-conditioning device designed to correct up to a range of more than the output voltage. 2. An air conditioner including an inverter device that inputs AC power from a three-phase AC power supply via a reactor and supplies variable-frequency and variable-voltage AC power to an induction motor, wherein the inverter device includes: A rectifier for rectifying the AC voltage of the three-phase AC power supply, a boost chopper for converting a DC voltage output by the rectifier into an arbitrary DC voltage and outputting the DC voltage, and a frequency variable for the DC voltage output by the boost chopper; A power conversion unit that converts a voltage into a variable AC voltage; a voltage fluctuation detection unit that detects a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change; and the voltage fluctuation detection unit. A fluctuation detecting section for extracting only an AC component in the output of the comparator and outputting pulses corresponding to a large portion and a small portion as compared with the average voltage; A step-up chopper voltage control unit that controls an output voltage of the step-up unit, a DC voltage detection unit that detects an output voltage of the step-up chopper unit, and a DC unit voltage fluctuation detection unit that detects a fluctuation range of the detected DC voltage. A comparison unit that compares a variation range of the DC voltage with a predetermined DC portion variation allowable value, and outputs a variation coefficient corresponding to an excess when the variation range exceeds the DC portion variation allowable value; and a pulse of the pulse. The regenerative voltage fluctuation amount corresponding to the regenerative state of the induction motor and the powering voltage fluctuation amount corresponding to the powering state are calculated based on the width, the timing, and the fluctuation coefficient, and the AC frequency output by the power conversion unit is calculated. The basic frequency command value to be instructed and the output voltage of the step-up chopper section, the regenerative state of the induction motor based on the regenerative voltage fluctuation amount in the regenerative state and the powering voltage fluctuation amount in the powering state. A waveform calculating unit that controls the power conversion unit and the boost chopper voltage control unit while correcting in a direction to reduce vibration due to repetition of the powering state, wherein the waveform calculating unit includes a predetermined base in the correction. A vibration mitigation device in an air conditioner, wherein an output voltage of the boost chopper is corrected to be equal to or higher than an output voltage of the rectifier for the corrected basic frequency command value exceeding a frequency. 3. An air conditioner including an inverter device that receives AC power from a three-phase AC power supply via a reactor and supplies variable-frequency and variable-voltage AC power to an induction motor, wherein the inverter device includes: A rectifier for rectifying the AC voltage of the three-phase AC power supply, a boost chopper for converting a DC voltage output by the rectifier into an arbitrary DC voltage and outputting the DC voltage, and a frequency variable for the DC voltage output by the boost chopper; A power conversion unit that converts a voltage into a variable AC voltage; a voltage fluctuation detection unit that detects a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change; and the voltage fluctuation detection unit. A fluctuation detecting section for extracting only an AC component in the output of the comparator and outputting pulses corresponding to a large portion and a small portion as compared with the average voltage; A step-up chopper voltage control unit that controls an output voltage of the induction motor; a regenerative voltage variation corresponding to a regenerative state of the induction motor based on a pulse width and a timing of the pulse; And a basic frequency command value indicating the frequency of the alternating current output by the power conversion unit and the output voltage of the alternating current, the regenerative voltage variation in the regenerative state, and the powering voltage in the powering state. A waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration caused by repetition of a regenerative state and a powering state of the induction motor based on the amount of variation; In the above, for the corrected basic frequency command value exceeding a predetermined base frequency, the output voltage of the step-up chopper unit and the output voltage of the rectifier unit and the maximum regeneration calculated up to the present time are calculated. Vibration relief apparatus in an air conditioning apparatus that corrects the sum voltage of the pressure variation. 4. An air conditioner including an inverter device that inputs AC power from a three-phase AC power supply via a reactor and supplies variable-frequency and variable-voltage AC power to an induction motor, wherein the inverter device includes: A rectifier for rectifying the AC voltage of the three-phase AC power supply, a boost chopper for converting a DC voltage output by the rectifier into an arbitrary DC voltage and outputting the DC voltage, and a frequency variable for the DC voltage output by the boost chopper; A power conversion unit that converts a voltage into a variable AC voltage; a voltage fluctuation detection unit that detects a change in energy transferred between the boost chopper unit and the power conversion unit as a voltage change; and the voltage fluctuation detection unit. A fluctuation detecting section for extracting only an AC component in the output of the comparator and outputting pulses corresponding to a large portion and a small portion as compared with the average voltage; A step-up chopper voltage control unit that controls an output voltage of the step-up unit, a DC voltage detection unit that detects an output voltage of the step-up chopper unit, and a DC unit voltage fluctuation detection unit that detects a fluctuation range of the detected DC voltage. A comparison unit that compares a variation range of the DC voltage with a predetermined DC portion variation allowable value, and outputs a variation coefficient corresponding to an excess when the variation range exceeds the DC portion variation allowable value; and a pulse of the pulse. The regenerative voltage fluctuation amount corresponding to the regenerative state of the induction motor and the powering voltage fluctuation amount corresponding to the powering state are calculated based on the width, the timing, and the fluctuation coefficient, and the AC frequency output by the power conversion unit is calculated. The basic frequency command value to be instructed and the AC output voltage, based on the regenerative voltage variation in the regenerative state and the powering voltage variation in the powering state,
A waveform calculation unit that controls the power conversion unit while correcting in a direction to reduce vibration caused by repetition of a regenerative state and a powering state of the induction motor, wherein the waveform calculation unit includes a predetermined base frequency in the correction. For the corrected basic frequency command value exceeding, the output voltage of the step-up chopper section is corrected to an added voltage of the output voltage of the rectifying section and the maximum regenerative voltage variation calculated up to the present time. Vibration reduction device in harmony device.