INVERTER CONTROL DEVICE AND POWER CONVERSION DEVICE
First Claim
1. An inverter control device for controlling an inverter which converts DC power supplied thereto via an LC filter including a reactor and a capacitor into AC power having an intended frequency and an intended voltage value, and supplies the converted power to an AC motor, whereinwithin a predetermined frequency band of fluctuation of a DC voltage supplied to the inverter, the inverter control device increases an inverter output voltage supplied from the inverter to a motor when the DC voltage increases, and decreases the inverter output voltage when the DC voltage decreases, whereas outside the predetermined frequency band of the DC voltage, the inverter control device reduces fluctuation of the inverter output voltage due to fluctuation of the DC voltage.
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Accused Products
Abstract
A DC voltage value from a DC voltage detection section is input directly to a voltage correction section without passing through a compensator or a filter. Therefore, even when rapid voltage change occurs, such as short power interruptions, instantaneous voltage drop and return from instantaneous voltage drop, the voltage correction section can quickly perform the correction operation in response to the rapid voltage change. Since the amount of link resonance compensation is limited by the limitation section to a certain range, it is possible to prevent the amount of link resonance compensation from fluctuating excessively upon rapid voltage change. Since the amount of link resonance compensation which is limited by the limitation section to a certain range is input to one compensator that has an appropriate control band, among all control calculation sections, the response does not have to be unnecessarily fast, thus realizing a stable control.
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Citations
25 Claims
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1. An inverter control device for controlling an inverter which converts DC power supplied thereto via an LC filter including a reactor and a capacitor into AC power having an intended frequency and an intended voltage value, and supplies the converted power to an AC motor, wherein
within a predetermined frequency band of fluctuation of a DC voltage supplied to the inverter, the inverter control device increases an inverter output voltage supplied from the inverter to a motor when the DC voltage increases, and decreases the inverter output voltage when the DC voltage decreases, whereas outside the predetermined frequency band of the DC voltage, the inverter control device reduces fluctuation of the inverter output voltage due to fluctuation of the DC voltage.
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6. An inverter control device for controlling an inverter which converts DC power supplied thereto via an LC filter including a reactor and a capacitor into AC power having an intended frequency and an intended voltage value, and supplies the converted power to an AC motor, the inverter control device comprising:
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control calculation sections for calculating an output voltage command; an output voltage correction section for directly receiving a DC voltage value from a DC voltage detection section which detects a voltage of DC power supplied to the inverter so as to correct an output voltage command from the control calculation sections based on the DC voltage value; a PWM calculation section for calculating a control signal for PWM-controlling the inverter based on an output voltage command from the output voltage correction section; a fluctuation component detection section for detecting a fluctuation component (the fluctuation component at least not including a DC component and including a resonance frequency (f0) component of the LC filter) of the DC voltage detected by the DC voltage detection section; a link resonance compensation section for calculating an amount of compensation (amount of link resonance compensation) for reducing link resonance due to the LC filter based on the fluctuation component detected by the fluctuation component detection section; a limitation section for limiting the amount of link resonance compensation to a predetermined range; and a correction section for correcting, by the amount of link resonance compensation limited by the limitation section, an input command to one of the compensators in the control calculation section that has such a control band with which it is possible to control the resonance frequency (f0) of the LC filter. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A power conversion device comprising:
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a converter section for converting AC power from an AC power supply into DC power; an LC filter including a reactor and a capacitor; an inverter section, to which the DC power from the converter section is supplied via the LC filter, for converting the DC power into AC power having an intended frequency and an intended voltage value, and supplying the converted power to an AC motor; and an inverter control section for controlling the inverter section, wherein within a predetermined frequency band of fluctuation of a DC voltage supplied to the inverter, the inverter control section increases an inverter output voltage supplied from the inverter to a motor when the DC voltage increases, and decreases the inverter output voltage when the DC voltage decreases, whereas outside the predetermined frequency band of the DC voltage, the inverter control section reduces fluctuation of the inverter output voltage due to fluctuation of the DC voltage. - View Dependent Claims (14, 15, 16, 17)
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18. A power conversion device comprising:
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a converter section for converting AC power from an AC power supply into DC power; an LC filter including a reactor and a capacitor; an inverter section, to which the DC power from the converter section is supplied via the LC filter, for converting the DC power into AC power having an intended frequency and an intended voltage value, and supplying the converted power to an AC motor; and an inverter control section for controlling the inverter section, the inverter control section comprising; a DC voltage detection section for detecting a voltage of the DC power supplied to the inverter section; control calculation sections (204-208) for calculating an output voltage command; an output voltage correction section for directly receiving a DC voltage value detected by the DC voltage detection section so as to correct an output voltage command from the control calculation sections based on the DC voltage value; a PWM calculation section for calculating a control signal for PWM-controlling the inverter section based on an output voltage command from the output voltage correction section; a fluctuation component detection section for detecting a fluctuation component (the fluctuation component at least not including a DC component and including a resonance frequency (f0) component of the LC filter) of the DC voltage detected by the DC voltage detection section; a link resonance compensation section for calculating an amount of compensation (amount of link resonance compensation) for reducing link resonance due to the LC filter based on the fluctuation component detected by the fluctuation component detection section; a limitation section for limiting the amount of link resonance compensation to a predetermined range; and a correction section for correcting, by the amount of link resonance compensation limited by the limitation section, an input command to one of the compensators in the control calculation section that has such a control band with which it is possible to control the resonance frequency (f0) of the LC filter. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification