JP4831527B2 - Voltage source inverter device and operation method thereof - Google Patents

Description

  The present invention relates to a voltage source inverter device for driving an electric motor and an operation method thereof.

The operation method at the time of instantaneous power failure in the conventional voltage source inverter device is that the AC motor is decelerated if the terminal voltage (intermediate voltage) of the smoothing capacitor falls to level 1 or less, and the intermediate voltage is level 2 or more due to regenerative power accompanying the deceleration. If the AC voltage is increased, the AC motor is accelerated, and thereafter, the acceleration / deceleration control is repeated according to the increase / decrease of the intermediate voltage as described above, thereby reducing the rate of decrease of the intermediate voltage (see, for example, Patent Document 1).
In addition, there is one that prevents a decrease in the inverter circuit voltage by sending a deceleration command that slightly lowers the speed command of the inverter circuit due to the operation of the power failure detection circuit at the time of an instantaneous power failure and causing the motor to perform a regenerative operation (for example, Patent Document 2).

Furthermore, the power loss during continuous operation is reduced by setting the torque command to the AC motor to zero by the power failure detection signal and reducing the magnetic flux command, so that the energy stored in the smoothing capacitor can be used to continue operation during the momentary power failure. (For example, refer patent document 3).
Further, the inverter device starts deceleration by the power failure detection signal, and the deceleration rate 1 is calculated from the target value and detected value of the DC intermediate voltage so that the DC intermediate voltage becomes constant during deceleration, and the DC intermediate voltage is calculated. The deceleration rate 2 is calculated from the rate of change, and the deceleration time is controlled by PI control of the value obtained by multiplying the two deceleration rates. When the DC intermediate voltage rises during deceleration, the deceleration time is controlled. There is also a thing which stops (for example, refer patent document 4).
As described above, the operation method at the time of the instantaneous power failure in the conventional voltage type inverter device is to adjust the speed command by the level of the terminal voltage (intermediate voltage) of the smoothing capacitor or the operation of the power failure detection circuit, or to set the deceleration rate. The power loss is reduced by determining and operating the motor regeneratively or by reducing the torque command to zero and reducing the magnetic flux command.
JP-A-6-165579 Japanese Patent Laid-Open No. 4-91696 JP-A-5-308781 Japanese Patent No. 3120460

In conventional voltage-type inverter control devices, the operation continuation method during an instantaneous power failure is difficult to set the deceleration time up to the permissible speed when applied to a system with varying load, or the voltage decreases when the deceleration time is set slowly. If the setting of the deceleration time is short, there is a problem that the motor is vibrated repeatedly by decelerating and accelerating. In particular, when applied to systems with low mechanical rigidity and voltage source inverter control devices with reduced smoothing capacitor capacity, the drop in and rise in DC bus voltage (Vpn), which is the terminal voltage of the smoothing capacitor, is abrupt. There is a problem that it is easy to trip at low voltage and difficult to adjust for smooth deceleration operation.
The present invention has been made in view of such problems, and even when applied to a system with low mechanical rigidity or a voltage source inverter control device with a reduced smoothing capacitor capacity, difficult adjustment is not required, and instantaneous power failure It is an object of the present invention to provide a voltage source inverter control device capable of continuing operation without tripping overvoltage or low voltage, and an operation method thereof.

In order to solve the above problem, the present invention is as follows.
According to the first aspect of the present invention, an AC motor is used as a load and a rectifier circuit that converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes a DC voltage from the rectifier circuit, and the smoothing capacitor are used. PWM inverter circuit that converts DC power sent to any frequency, current detector that detects inverter output current, voltage detection circuit that detects the terminal voltage of the smoothing capacitor, and instantaneous power failure detection of the AC power supply A power failure detection circuit, an output voltage command calculation circuit that calculates an output voltage command based on a speed command, a PWM control circuit that controls the PWM inverter circuit based on an output signal of the output voltage command calculation circuit, A voltage source inverter control device comprising a base drive circuit for driving the PWM inverter circuit based on an output signal from the PWM control circuit A power calculation circuit for calculating a power output of the voltage source inverter control device, an output value of the voltage detection circuit, and an output value of the power calculation circuit, a power output target value and a speed command at the time of an instantaneous power failure It has a speed command calculation circuit that calculates a value, and the power failure detection circuit stops deceleration when the voltage of the AC power supply becomes a value before the power failure detection during deceleration operation or when the voltage detection circuit output rises. It is characterized by.

According to a second aspect of the present invention, there is provided the voltage source inverter control device according to the first aspect, wherein the speed command arithmetic circuit is a power source in the voltage source inverter control device based on a sign of an output value of the power arithmetic circuit. The power output target value is corrected and calculated by adding or subtracting the loss, and the speed command value at the moment of power failure is calculated.
According to a third aspect of the present invention, there is provided the voltage source inverter control device according to the first aspect, wherein the speed command calculation circuit is configured to reduce power loss in a machine including the AC motor based on a sign of the power output target value. The power output target value is corrected and calculated by adding or subtracting, and the speed command value at the moment of power failure is calculated.
According to a fourth aspect of the present invention, there is provided the voltage source inverter control device according to the first aspect, wherein the speed command calculation circuit generates a torque target value obtained based on the power output target value and speed information of the AC motor. It is characterized by a limit process.
A fifth aspect of the present invention is the voltage source inverter control device according to any one of the first to fourth aspects, wherein, when the AC motor is an induction machine, the speed command calculation circuit includes the power output A slip frequency command is calculated using a torque target value obtained based on the target value and speed information of the AC motor, and the slip compensation is performed.

In order to solve the above problem, the present invention is as follows.
According to a sixth aspect of the present invention, an AC motor is used as a load, a rectifier circuit that converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes a DC voltage from the rectifier circuit, and the smoothing capacitor. PWM inverter circuit that converts DC power sent to any frequency, current detector that detects inverter output current, voltage detection circuit that detects the terminal voltage of the smoothing capacitor, and instantaneous power failure detection of the AC power supply A power failure detection circuit, an output voltage command calculation circuit that calculates an output voltage command based on a speed command, a PWM control circuit that controls the PWM inverter circuit based on an output signal of the output voltage command calculation circuit, A voltage source inverter control device comprising a base drive circuit for driving the PWM inverter circuit based on an output signal from the PWM control circuit In the operation method for dealing with an instantaneous power failure of the AC power source, a procedure for calculating a power output of the voltage source inverter control device and obtaining a power output target value based on the output value of the voltage detection circuit and the power output value Then, the speed command value at the moment of power failure is calculated, and the deceleration is stopped when the voltage of the AC power source becomes the value before the power failure is detected or the voltage detection circuit output rises during the deceleration operation.

According to a seventh aspect of the present invention, there is provided a method for operating the voltage source inverter control device according to the sixth aspect, wherein in the speed command calculation circuit, the voltage type inverter control device is based on a sign of an output value of the power calculation circuit. The power output target value is corrected and calculated by adding or subtracting the amount of power loss at, and the speed command value at the moment of power failure is calculated.
The invention according to claim 8 is the operation method of the voltage source inverter control device according to claim 6, wherein the speed command calculation circuit is a machine including the AC motor based on the sign of the power output target value. The power output target value is corrected and calculated by adding or subtracting power loss, and the speed command value at the moment of power failure is calculated.
The invention according to claim 9 is the operation method of the voltage source inverter control device according to claim 6, wherein the speed command calculation circuit obtains the torque obtained based on the power output target value and speed information of the AC motor. A limit process is performed on the target value.
The invention described in claim 10 is the operation method of the voltage source inverter control device according to any one of claims 6 to 9, wherein the speed command calculation circuit is configured such that the AC motor is an induction machine. A slip frequency command is calculated using a torque target value obtained based on the power output target value and the speed information of the AC motor, and the slip compensation is performed.

According to the first and sixth aspects of the invention, a loop for controlling the power output of the voltage source inverter control device can be configured inside the loop for determining the deceleration command based on the target voltage and the detection voltage of the smoothing capacitor terminal, The target value control of the smoothing capacitor terminal voltage can be quickly converged.
Further, according to the inventions of claims 2 and 7, the power output target value can be calculated in consideration of the power loss in the voltage source inverter control device. According to the inventions of claims 3 and 8, the AC motor can be The power output target value can be calculated in consideration of the power loss in the machine including it. For this reason, even when the target voltage of the smoothing capacitor terminal matches the detected value, the deceleration operation can be smoothly performed, and unnecessary deceleration stop and deceleration are not repeated.
In addition, according to the fourth and ninth aspects of the present invention, the target torque value can be limited and the generation of excessive torque can be prevented, so that the applied machine can be protected.
According to the fifth and tenth aspects of the present invention, when the AC motor as a load is an induction machine, the slip frequency can be compensated for decelerating operation, and the delay time until the intended regenerative power is obtained can be shortened. .

  Hereinafter, embodiments of the present invention and specific examples of the method of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing the entire voltage source inverter control device of the present invention.
In FIG. 1, 1 is a rectifier circuit that converts AC power from an AC power source into DC power, 2 is a smoothing capacitor that smoothes the DC voltage from the rectifier circuit 1, and 3 is an arbitrary DC power sent through the smoothing capacitor 2. PWM inverter circuit for converting the frequency to 4, 4 is a current detector for detecting the inverter output current, 5 is a voltage detection circuit for detecting the terminal voltage of the smoothing capacitor 2, 6 is for detecting a power failure and selecting a speed command during power failure detection A power failure detection circuit for performing power failure, 7 a speed command computation circuit for computing a speed command during power failure detection, 8 an output voltage command computation circuit for computing an output voltage command based on a speed command sent from the power failure detection circuit 6, Is a PWM control circuit that performs PWM control of the PWM inverter circuit 3 based on the output signal sent from the power failure detection circuit 6, and 10 is PW based on the output signal from the PWM control circuit 9 Comprised base one scan drive circuit for driving the inverter circuit 3.
Reference numeral 11 is an AC contactor on the AC power supply side, 12 is a speed command setter for setting a speed command during normal operation, and 13 is an AC electric motor driven by the output of the PWM inverter circuit 3, which is controlled by a voltage source inverter. Connected to the device.

FIG. 2 is a block diagram of the power failure detection circuit 6 that selects a speed command during normal operation and when a power failure is detected.
In FIG. 2, the power failure detection circuit 6 includes a switch circuit 21, a soft starter 22, an OR circuit 23, a comparator 24, a predetermined value setting circuit (UV level 1) 25, and a power failure detection contact from the electromagnetic contactor 11. The signal and the output signal of the OR circuit 23 output from the comparator 24 described later are sent to the speed command calculation circuit 7 as a power failure detection signal. Further, the terminal voltage Vpn of the smoothing capacitor 2 from the voltage detection circuit 5 is compared with the output of the predetermined value setting circuit 25 by the comparator 24. If the terminal voltage is lower than the output of the predetermined value setting circuit 25, UV (low voltage) is set. Output signal. The switch circuit 21 switches between a speed command from the speed command calculation circuit 7 at the time of a power failure and a speed command from the speed command setter 12 at a normal time via the soft starter 22 by a power failure detection signal.

FIG. 3 is a block diagram of a speed command calculation circuit 7 for calculating a speed command during power failure detection.
In FIG. 3, reference numerals 31, 32, and 33 are respectively set with a target voltage Vpnc of the terminal of the smoothing capacitor 2, a capacitor capacity C of the smoothing capacitor 2, and an inertia moment J of the entire load including the AC motor 13 in a predetermined value setting circuit. 34 is an energy target value calculation circuit that is stored in the smoothing capacitor 2, 35 is an energy calculation circuit that is stored in the smoothing capacitor 2, 36 is a power calculation circuit, 37 is a subtractor, and 38 is a storage energy of 34 and 35. A target time setting circuit for setting a target time required to match the target value with the current value, 39 is a divider, 40 is a subtractor, 41 is a multiplier, 42 is an adder, and 43 is an entire load including the AC motor 13. Kinetic energy calculation circuit, 44 is a 2 / J multiplier, 45 is a divider, 46 is a route calculation unit, 48 is a speed calculation circuit, and 49 has a delay circuit. That.

The energy target value calculation circuit 34 calculates (C × Vpnc ² ) / 2 using the outputs of the predetermined value setting circuits 31 and 32, and the energy calculation circuit 35 sends the output from the predetermined value setting circuit 31 and the voltage detection circuit 5. (C × Vpn ² ) / 2 is calculated using the terminal voltage Vpc of the smoothing capacitor 2 and the power calculation circuit 36 calculates the inverter output current detection value obtained by the current detector 4 and the output voltage command calculation circuit 8. The power output P is calculated on the basis of the voltage command value sent from.

On the other hand, the target time setting circuit 38 obtains the relational expression (1) when the power output target value Pref of the voltage source inverter control device is constant.
(C × Vpnc ² ) / 2− (C × Vpn ² ) / 2 = −Pref × Δt (1)

Based on this, a target time Δt required to make the energy stored in the smoothing capacitor 2 coincide with the target value is determined, and Pref at that time is calculated by the equation (2).
Pref = C × (Vpn ² −Vpnc ² ) / Δt (2)

Further, the speed command after the target time Δt can be obtained by Equation (3) by approximating that the difference in kinetic energy is the product of the supplied power and the Δt.
(J × ωrref ² ) / 2− (J × ωr ^ ² ) / 2 = Pref × Δt
Therefore, ωrref = {[(J × ωr ^ ² ) / 2 + Pref × Δt] × 2 / J} ^1/2
(3)

The speed calculation circuit 48 calculates the speed command ωrref obtained by the equation (3) as a speed command to be sent this time based on the target time Δt.
The target time Δt may be a constant value or may be incorporated in the target time setting circuit 38 as a function value such as (Vpnc−Vpn).
Further, the speed information ωr ^ of the AC motor 13 is obtained by using the previous speed command. However, when a circuit for detecting or estimating the speed is incorporated, the detected speed value or the estimated value may be used. .

FIG. 4 is a block diagram of a speed command calculation circuit 7 ′ showing the configuration of the second embodiment.
4 differs from FIG. 3 in that the speed command calculation circuit 7 is replaced with 7 ′. The subtractor 40 is changed to an adder / subtractor 40 ′, and a predetermined value setting circuit 51, a divider 52, and a torque limit circuit. 53, a multiplier 54, a predetermined value setting circuit 55, an adder / subtractor 56, a multiplier 57, a slip operation circuit 58, an adder 59, and a subtractor 60.
The predetermined value setting circuit 51 is set to the power loss amount in the voltage source inverter control device, and the predetermined value setting circuit 55 is set to the power loss amount in the machine including the AC motor.
The value obtained by adding or subtracting the power loss amount in the voltage source inverter control device to the power output target value Pref is divided by the speed information ωr ^ of the AC motor 13 using the divider 52 to convert it into a torque target value. The value is limited by the torque limit circuit 53 with a value taking machine protection into consideration. Furthermore, the speed information ωr ^ of the AC motor 13 is multiplied by a multiplier 54 to obtain a power output target value Pref. Further, an adder / subtractor 56 adds / subtracts the power loss amount in the machine including the AC motor to / from the power output target value Pref.

Further, if the applied motor is an induction machine, the slip frequency is calculated by using the output value of the torque limit circuit 53 and added to the speed command at the time of power failure using the adder 59 to perform the slip compensation. In this case, in the embodiment, the speed information ωr ^ of the AC motor 13 sent from the delay circuit 49 is configured to include the slip frequency. Therefore, the slip frequency is subtracted by using the subtractor 60 to obtain ωr ^. replace.
The reason why 40 'and 56 are used as an adder / subtracter is that the AC motor 13 is operated not only in regenerative operation but also in electric (crawling) operation depending on the sign of the power output calculation value P and the power output target value Pref. The adder / subtractor 40 'operates as an adder when the power output calculation value P is electrically driven (cash row), and the adder / subtractor 56 operates as an adder when the power output target value Pref is electrically driven (cash row). In this case, the present invention can be effectively implemented.
Here, the power loss in the machine including the voltage source inverter control device and the AC motor is constant as the set value of the predetermined value setting circuits 51 and 55. However, it is strictly incorporated as a function of the inverter output current or the like. Needless to say, you can.

  FIG. 4 shows all the considerations for the power loss in the voltage source inverter controller, the power loss in the machine including the AC motor, the mechanical protection, and the slip frequency compensation when the applied motor is an induction machine from the configuration of FIG. However, any one of these additions for consideration may be used, or any combination of a plurality of them may be used. Even in that case, each effect is not changed.

FIG. 5 is a block diagram of a speed command calculation circuit 7 '' showing the configuration of the third embodiment.
5 differs from FIG. 4 in that the speed command calculation circuit 7 ′ is replaced with 7 ″. The predetermined value setting circuit 33, the target time setting circuit 38, the dividers 39 and 45, the adder 42, the motion The energy computing circuit 43, the coefficient unit 44, the route computing unit 46, the subtractor 47, the predetermined value setting circuits 51 and 55, the multiplier 54, the adder / subtractor 56, and the multiplier 57 are deleted, and the coefficient units 61 and 63, the predetermined value setting. The circuit 62 and the adder 64 are added.
The coefficient unit 61 functions in the same way as the time required to match the target value of the stored stored energy and the current value in the energy target value calculating circuit 34 and the energy calculating circuit 35 in the above description. Is set as a proportional gain that matches the current value, and the output of the coefficient unit 61 becomes the power output target value Pref. The coefficient unit 63 is set as a gain corresponding to a conversion coefficient from torque to acceleration, using the inverse of the set value J of the moment of inertia of the entire load including the AC motor 13 as a guide. In the predetermined value setting circuit 62, a total amount of power loss in a machine including a voltage source inverter control device and an AC motor is set. The adder 64 is an adder for calculating a speed command value from the speed information ωr ^ and acceleration information.

The power output target value Pref is corrected with a value obtained by subtracting the amount of power loss in a machine including a voltage source inverter control device and an AC motor, newly rewritten as Pref, and the power output calculation value P calculated by the power calculation circuit 36. The difference is divided by the speed information ωr ^ of the AC motor 13 using the divider 52 and converted into a torque target value. This torque target value is limited by the set value of the torque limit circuit 53.
Further, if the applied motor is an induction machine, the slip frequency is calculated by using the output value of the torque limit circuit 53 and added to the speed command using the adder 59 to perform the slip compensation.
Here, the power loss in the machine including the voltage source inverter control device and the AC motor is constant as the set value of the predetermined value setting circuit 62. However, it is strictly incorporated as a function of the inverter output current or the like. Needless to say, you can.

Next, the operation continuation control method during power failure detection in the voltage source inverter control apparatus of the present embodiment will be described.
FIG. 6 is a time chart when a power failure occurs.
6A is an AC power supply ON / OFF state, FIG. 6B is a power failure detection contact open / close state, FIG. 6C is an operation command state, FIG. 6D is a change in the terminal voltage Vpn of the smoothing capacitor 2, and (F) shows the speed command of the voltage source inverter control device.
When an instantaneous power failure of the AC power supply occurs, the magnetic contactor 11 (FIG. 1) is opened, or the terminal voltage of the smoothing capacitor 2 detected by the voltage detection circuit 5 is lower than the low voltage detection level (UV level 1). become. The power failure detection circuit 6 detects a power failure at the earlier timing. When the power failure detection circuit 6 detects a power failure, the power failure detection signal is “1”. As shown in FIG. 2, the power failure detection circuit 6 detects the power failure from the normal speed command by the switch circuit 21. Switch to the speed command.
When the speed command is switched to a speed command (deceleration command) during power failure detection, the AC motor 13 starts to decelerate, and the kinetic energy corresponding to the deceleration amount and the moment of inertia J passes through the PWM inverter circuit 3. The smoothing capacitor 2 is charged as regenerative power, and its terminal voltage is increased. At this time, strictly speaking, the power loss in the voltage source inverter control device and the power loss in the machine including the AC motor are considerably reduced.

When the power failure detection signal becomes “1”, the power failure detection circuit 6 sends the power failure detection signal to the speed command calculation circuit 7 or 7. The speed command calculation circuit 7 or 7 ′ calculates a speed command for decelerating the AC motor 13 based on the block diagram shown in FIG. 3 or FIG.
Strictly speaking, in the speed command calculation circuit 7, the energy accumulated in the smoothing capacitor 2 is the target value (C × Vpnc) so that the target voltage Vpnc of the smoothing capacitor 2 terminal and the detection voltage Vpn of the voltage detection circuit 8 coincide. ^2/2) and the detection value (C × ^Vpn 2/2) is computed power output target value Pref to coincide, and the power output target value Pref, power output calculation value P calculated by the power calculation circuit 36 The difference in kinetic energy is calculated for the load so as to match, and the speed command ωref is calculated based on the above equations (2) and (3). The speed calculator 48 calculates the speed command to be sent this time based on the target time Δt and the sampling time of the calculation process for the speed command ωrref obtained by the above equation (3).

In calculating the power output target value Pref, the speed command calculation circuits 7 ′ and 7 ″ take into account the power loss in the voltage source inverter control device and the power loss in the machine including the AC motor, The power output target value Pref is corrected and calculated.
Further, after the power output target value Pref is divided by the speed information ωr ^ of the AC motor 13 to obtain the torque target value, it is limited for machine protection.
Furthermore, if the applicable motor is an induction machine, the slip calculation circuit 58 calculates the slip frequency based on the torque target value, and adds it to the speed command to compensate for the slip.
In this way, the speed command at the time of power failure is calculated, the speed command is sent to the voltage command calculator, and the AC motor 13 is decelerated.

  When the instantaneous power failure of the AC power supply is recovered, the magnetic contactor 11 is closed and the terminal voltage of the smoothing capacitor 2 becomes the low voltage detection level (UV level 1) or more, and the power failure detection signal in FIG. It switches to the speed command for normal operation and accelerates or decelerates to the speed command set value during the acceleration / deceleration time in normal operation.

  Because of the above configuration, when the AC power supply is instantaneously interrupted, the speed command at the time of the power failure is selected, and the operation is decelerated. Since the procedure is to provide a speed command that accelerates or decelerates to the speed command set value over time, the operation can be continued during an instantaneous power failure.

Schematic configuration diagram showing the entire voltage source inverter control device of the present invention Block diagram of power failure detection circuit 6 for selecting a speed command during power failure detection of the present invention Block diagram of speed command calculation circuit 7 of the present invention Block diagram of speed command calculation circuit 7 'showing another embodiment of the present invention Block diagram of a speed command calculation circuit 7 '' showing another embodiment of the present invention Time chart when a power failure occurs

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rectification circuit 2 Smoothing capacitor 3 PWM inverter circuit 4 Current detector 5 Voltage detection circuit 6 Power failure detection circuit 7, 7 ', 7''Speed command calculation circuit 8 Output voltage command calculation circuit 9 PWM control circuit 10 Base drive circuit 11 Electromagnetic Contactor 12 Speed command setter 13 AC motor 20 Voltage source inverter control device
21 switch circuit 22 soft starter 23 OR circuit 24 comparators 25, 31, 32, 33, 51, 55, 62 predetermined value setting circuit 34 energy target value calculation circuit 35 energy calculation circuit 36 power calculation circuits 37, 40, 47, 60 Subtractor 38 Target time setting circuit 39, 45, 52 Divider 40 ', 56 Adder / subtractor 41, 54, 57 Multiplier 42, 59, 64 Adder 43 Kinetic energy calculation circuit 44, 61, 63 Coefficient unit 46 Route calculator 48 Speed calculation circuit 49 Delay circuit 53 Torque limit circuit 58 Slip calculation circuit

Claims (10)

A rectifier circuit that uses an AC motor as a load and converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes the DC voltage from the rectifier circuit, and DC power sent through the smoothing capacitor at an arbitrary frequency A PWM inverter circuit for converting to a current detector, a current detector for detecting an inverter output current, a voltage detection circuit for detecting a terminal voltage of the smoothing capacitor, a power failure detection circuit for detecting an instantaneous power failure of the AC power supply, and a speed command. An output voltage command calculation circuit that calculates an output voltage command based on the output voltage command calculation circuit, a PWM control circuit that controls the PWM inverter circuit based on an output signal of the output voltage command calculation circuit, and an output signal from the PWM control circuit And a voltage source inverter control device comprising a base drive circuit for driving the PWM inverter circuit,
A power calculation circuit for calculating a power output of the voltage source inverter control device;
Based on the output value of the voltage detection circuit and the output value of the power calculation circuit, a power command target value and a speed command calculation circuit that calculates a speed command value at the moment of power failure,
The voltage-type inverter control device, wherein the power failure detection circuit stops deceleration when the voltage of the AC power supply becomes a value before power failure detection or the output of the voltage detection circuit rises during deceleration operation.   The speed command calculation circuit corrects and calculates the power output target value by adding or subtracting the power loss in the voltage source inverter control device based on the sign of the output value of the power calculation circuit, and the speed during an instantaneous power failure 2. The voltage source inverter control device according to claim 1, wherein the command value is calculated.   The speed command calculation circuit corrects the power output target value by adding or subtracting power loss in a machine including the AC motor based on the sign of the power output target value, and calculates a speed command value at the time of an instantaneous power failure The voltage-type inverter control device according to claim 1, wherein:   2. The voltage-type inverter control device according to claim 1, wherein the speed command calculation circuit limits the torque target value obtained based on the power output target value and speed information of the AC motor.   When the AC motor is an induction machine, the speed command calculation circuit calculates a slip frequency command using a torque target value obtained based on the power output target value and the speed information of the AC motor, and compensates for the slip. 5. The voltage source inverter control device according to claim 1, wherein A rectifier circuit that uses an AC motor as a load and converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes the DC voltage from the rectifier circuit, and DC power sent through the smoothing capacitor at an arbitrary frequency A PWM inverter circuit for converting to a current detector, a current detector for detecting an inverter output current, a voltage detection circuit for detecting a terminal voltage of the smoothing capacitor, a power failure detection circuit for detecting an instantaneous power failure of the AC power supply, and a speed command. An output voltage command calculation circuit that calculates an output voltage command based on the output voltage command calculation circuit, a PWM control circuit that controls the PWM inverter circuit based on an output signal of the output voltage command calculation circuit, and an output signal from the PWM control circuit And an AC power source for a voltage source inverter control device having a base drive circuit for driving the PWM inverter circuit. In the operating method of treatment to,
Calculate the power output of the voltage source inverter control device, calculate the output value of the voltage detection circuit and the power command target value based on the power output value, calculate the speed command value at the moment of power failure, and decelerate An operation method of a voltage-type inverter control device, characterized in that deceleration is stopped when the voltage of the AC power supply becomes a value before detection of a power failure or the output of the voltage detection circuit rises during operation.   The speed command calculation circuit corrects and calculates the power output target value by adding or subtracting the power loss in the voltage source inverter control device based on the sign of the output value of the power calculation circuit, and the speed at the moment of power failure 7. A method of operating a voltage source inverter control device according to claim 6, wherein a command value is calculated.   In the speed command calculation circuit, the power output target value is corrected and calculated by adding or subtracting the power loss in the machine including the AC motor based on the sign of the power output target value, and the speed command value at the moment of power failure The operation method of the voltage source inverter control device according to claim 6, wherein:   7. The operating method of a voltage source inverter control device according to claim 6, wherein the speed command calculation circuit performs a limit process on a torque target value obtained based on the power output target value and speed information of the AC motor.   When the AC motor is an induction machine, the speed command calculation circuit calculates a slip frequency command using a torque target value obtained based on the power output target value and the speed information of the AC motor, and compensates for the slip. The operation method of the voltage type inverter control apparatus according to any one of claims 6 to 9.

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