JP2011205729A - Power conversion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive configuration capable of reducing power supply harmonics by controlling an inverter unit in power conversion equipment including a smoothing capacitor having an electrostatic capacity where a voltage fluctuation occurring depending on a switching frequency can be smoothed although a voltage fluctuation due to a supply voltage of an AC power supply cannot be smoothed.SOLUTION: The power conversion equipment includes a reactor (L) provided between a converter (11) and a ground side of a capacitor (12), a voltage detection unit (21) for detecting a reactor voltage applied to the reactor (L), and an inverter control unit (25) for controlling the inverter unit (13) based on the reactor voltage detected by the voltage detection unit (21).

Description

  The present invention relates to a power conversion device including a converter unit and an inverter unit.

  2. Description of the Related Art Conventionally, there is known a power conversion device including a converter unit that converts AC power of an AC power source into DC power and an inverter unit that converts the output of the converter unit into AC power having a predetermined frequency. In such a power converter, a capacitor having a relatively large capacity such as an electrolytic capacitor is generally provided on the output side of the converter unit in order to smooth the voltage fluctuation caused by the power supply frequency of the AC power supply. It has been.

  On the other hand, as disclosed in Patent Document 1, for example, an electrolytic capacitor having a large capacitance capable of smoothing a voltage variation caused by a power supply frequency is used only for a voltage variation that occurs corresponding to the switching frequency of the switching element of the inverter unit. There is known a configuration in which the rectification portion is reduced in size and cost is reduced by changing to a small-capacitance capacitor that can be smoothed. In such a configuration, the current on the power source side is detected, and the inverter unit is controlled based on the detected current value, so that the power factor reduction on the power source side and the problem of harmonics are solved. ing.

JP 2002-51589 A

  By the way, as described above, when the smoothing capacitor is downsized and problems such as power supply harmonics are solved by controlling the inverter unit, it is usually necessary to detect the current on the power supply side. I need it. As this current sensor, for example, a CT or a shunt resistor is used, but such a current sensor is generally expensive, leading to an increase in the cost of the power converter.

  The present invention has been made in view of the above points. The object of the present invention is to smooth the voltage fluctuation caused by the power supply voltage but not to smooth the voltage fluctuation caused by the switching frequency. In a power converter provided with a smoothing capacitor having electric capacity, a configuration for reducing power supply harmonics by controlling an inverter unit is realized at low cost.

  In order to achieve the above object, in the power conversion device (1) according to the present invention, a reactor (L) is provided between the converter unit (11) and the ground side of the smoothing capacitor (12), and based on the reactor voltage. The inverter unit (13) was controlled.

  Specifically, in the first invention, a converter unit (11) connected to the AC power source (2) to rectify AC power of the AC power source (2) into DC power, and a plurality of switching elements (Su, Sv , Sw, Sx, Sy, Sz), and the switching power of the switching element (Su, Sv, Sw, Sx, Sy, Sz) changes the output power of the converter unit (11) to AC power of a predetermined frequency. A power conversion device including an inverter unit (13) for conversion and a capacitor (12) provided on the output side of the converter unit (11) is an object.

  A reactor (L) provided between the converter unit (11) and the ground side of the capacitor (12); and a voltage detection unit (21) for detecting a reactor voltage applied to the reactor (L); And an inverter control unit (25) for controlling the inverter unit (13) based on the reactor voltage detected by the voltage detection unit (21).

  With the above configuration, it is possible to control the inverter unit (13) based on the reactor voltage detected by the voltage detection unit (21), and to reduce harmonics caused by the power supply frequency. Therefore, since the inverter unit (13) can be controlled without providing an expensive current sensor for detecting the current on the power supply side, the cost of the power conversion device (1) can be reduced.

  Furthermore, since the reactor (L) is provided between the converter unit (11) and the ground side of the capacitor (12), the ground side of the capacitor (12) and the ground of the inverter control unit (25) are connected. If the same potential is detected, the voltage applied to the reactor (L) is detected by detecting only the high potential side of the reactor (L) when the reactor voltage is detected by the voltage detector (21). Can be detected. Therefore, since it is not necessary to detect the voltage at both ends of the reactor (L) with the above-described configuration, the inverter section (13) can be controlled by obtaining the reactor voltage at a lower cost and with higher accuracy.

  In the first aspect of the invention, the inverter control unit (25) has a reactor current waveform obtained from the reactor voltage detected by the voltage detection unit (21) approaches a predetermined target current waveform with less harmonics. As described above, the inverter section (13) is controlled (second invention).

  As a result, the current waveform on the power supply side can be made a waveform with less harmonics, and harmonics resulting from the power supply frequency can be reduced. Moreover, since the reactor current waveform obtained from the reactor voltage detected by the voltage detector (21) is directly brought close to a predetermined shape with less harmonics, harmonics generated in the current on the power source side can be reliably reduced. it can.

In the second invention, the inverter control section (25) includes a controller (34) for calculating a current compensation amount so that a deviation between the reactor current and the target current is small, and the current compensation amount Is added to at least one of the torque command value (T ^* ), the current command value (id ^* , iq ^* ), and the voltage command (Vd ^* , Vq ^* ) (third invention).

  Thereby, an inverter part (13) can be controlled using the electric current compensation amount set so that the deviation of a reactor current and a target current may be made small. Therefore, the inverter unit (13) can be controlled with high accuracy so as to reduce harmonics caused by the power supply frequency.

  In the first invention, the inverter control unit (25) controls the inverter unit (13) so that the waveform of the reactor voltage detected by the voltage detection unit (21) approaches the waveform of a predetermined target voltage. It shall be controlled (fourth invention).

  By doing so, the inverter unit (13) can be controlled using the reactor voltage without obtaining the current from the reactor voltage detected by the voltage detection unit (21). The inverter unit (13) can be controlled with high accuracy without occurrence.

In the fourth aspect of the invention, the inverter control unit (25) includes a controller (52) that calculates a voltage compensation amount so that a deviation between the reactor voltage and a target voltage is small, and the voltage compensation amount Is added to at least one of the torque command value (T ^* ), the current command value (id ^* , iq ^* ), and the voltage command (Vd ^* , Vq ^* ) (fifth invention).

  Thereby, an inverter part (13) can be controlled using the voltage compensation amount set so that the deviation of a reactor voltage and a target voltage may be made small. Therefore, the inverter unit (13) can be controlled with high accuracy so as to reduce harmonics caused by the power supply frequency.

  According to the power converter (1) of the present invention, the reactor (L) is provided between the converter unit (11) and the ground side of the capacitor (12), and the reactor voltage detected by the voltage detection unit (21). Since the inverter unit (13) is controlled based on the above, the inverter unit (13) can be accurately controlled with a low-cost configuration to reduce harmonics caused by the power supply frequency.

  According to the second aspect of the invention, the reactor current is obtained based on the reactor voltage detected by the voltage detector (21), and the inverter section (the waveform of the reactor current becomes the waveform of the predetermined target current). 13) is controlled, the harmonics of the current on the power supply side can be reliably reduced.

  According to the third aspect of the invention, the current deviation amount set so that the deviation between the reactor current and the target current becomes small is added to the command value, so that the harmonics caused by the power supply frequency are reduced. The inverter unit (13) can be controlled with high accuracy.

  Further, according to the fourth aspect of the invention, the inverter unit (13) is controlled so that the waveform of the reactor voltage detected by the voltage detection unit (21) becomes a desired waveform. Control can be performed with high accuracy, and harmonics of the current on the power supply side can be more reliably reduced.

  Furthermore, according to the fifth aspect of the invention, the voltage deviation amount set so that the deviation between the reactor voltage and the target voltage becomes small is added to the command value, so that harmonics caused by the power supply frequency are reduced. The inverter unit (13) can be controlled with high accuracy.

FIG. 1 is a circuit diagram illustrating a schematic configuration of the power conversion device according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating a waveform of the voltage (DC link voltage) between the terminals of the smoothing capacitor in the present embodiment. FIG. 3 is a block diagram illustrating a schematic configuration of the voltage command generation unit. FIG. 4 is a diagram corresponding to FIG. 3 illustrating a schematic configuration of the voltage command generation unit of the power conversion device according to the modification of the first embodiment. FIG. 5 is a diagram corresponding to FIG. 3 illustrating a schematic configuration of a voltage command generation unit of the power conversion apparatus according to the second embodiment. FIG. 6 is a diagram corresponding to FIG. 1 illustrating a schematic configuration of a power conversion device according to another embodiment. FIG. 7 is a diagram illustrating a waveform of a DC link voltage when a three-phase AC power supply is used.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

Embodiment 1
FIG. 1 shows a schematic configuration of a power conversion device (1) according to Embodiment 1 of the present invention. This power converter (1) includes a converter circuit (11) (converter unit), a smoothing capacitor (12) (capacitor), and an inverter circuit (13) (inverter unit), and is a single-phase AC power source. The AC power supplied from (2) is converted into power of a predetermined frequency and supplied to the three-phase AC motor (3). The three-phase AC motor (3) is for driving a compressor provided in a refrigerant circuit of an air conditioner, for example.

  The converter circuit (11) is connected to the AC power source (2) and configured to rectify an AC voltage into a DC voltage. The converter circuit (11) is a diode bridge circuit in which a plurality of (four in the present embodiment) diodes (D1 to D4) are connected in a bridge shape, and is connected to the AC power source (2). Yes. Thereby, the alternating voltage of the said alternating current power supply (2) is converted into a direct voltage by the bridge circuit of the said diode (D1-D4).

  The smoothing capacitor (12) is provided between the output side (upper side of the drawing in FIG. 1) and the ground (lower side of the drawing in FIG. 1) of the converter circuit (11). This smoothing capacitor (12) is constituted by, for example, a film capacitor, and when the switching element (Su, Sv, Sw, Sx, Sy, Sz) described later of the inverter circuit (13) performs a switching operation, the smoothing capacitor (12) It has a capacitance capable of smoothing only the ripple voltage (voltage fluctuation) generated correspondingly. That is, the smoothing capacitor (12) is a small-capacitance capacitor that does not have a capacitance that smoothes the voltage rectified by the converter circuit (11) (voltage fluctuation caused by the power supply voltage). FIG. 2 is a diagram illustrating a waveform of a voltage (DC link voltage) between terminals of the smoothing capacitor (12) in the present embodiment. As shown in the figure, the waveform of the DC link voltage of this embodiment is similar to the waveform obtained by full-wave rectification of a single-phase AC, but the bottom of the waveform becomes slightly smooth due to the action of the smoothing capacitor (12). The voltage at the bottom is greater than 0V. That is, the waveform of the DC link voltage is pulsating, and the maximum value of the pulsation in this example is twice or more the minimum value.

  The inverter circuit (13) is connected in parallel to the smoothing capacitor (12) on the output side of the converter circuit (11). The inverter circuit (13) is formed by bridge-connecting a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) (for example, six in the case of a three-phase alternating current). That is, the inverter circuit (13) includes three switching legs in which two switching elements are connected in series with each other. In each switching leg, the upper arm switching elements (Su, Sv, Sw) and the lower arm The midpoints of the switching elements (Sx, Sy, Sz) are connected to the coils (3a, 3b, 3c) of the respective phases of the three-phase AC motor (3).

  The inverter circuit (13) converts the DC voltage into a three-phase AC voltage by the on / off operation of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) and supplies it to the three-phase AC motor (3). Is configured to do. In this embodiment, a free-wheeling diode (Du, Dv, Dw, Dx, Dy, Dz) is connected in antiparallel to each of the switching elements (Su, Sv, Sw, Sx, Sy, Sz). Yes. In the present embodiment, a shunt resistor (14) for detecting a current flowing in the inverter circuit (13) is provided on the ground side of the inverter circuit (13).

  By the way, as described above, the smoothing capacitor (12) can only smooth the ripple voltage generated corresponding to the switching frequency of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) of the inverter circuit (13). In the case of a small-capacitance capacitor, the ripple voltage caused by the power supply frequency of the AC power supply (2) cannot be smoothed, and thus power supply harmonics are likely to occur. Therefore, in the configuration as described above, the driving of the switching elements (Su, Sv, Sw, Sx, Sy, Sz) in the inverter circuit (13) is controlled so that the power supply harmonics are as small as possible. In order to control the inverter circuit (13), it is necessary to detect a current on the power supply side, and therefore, a current sensor such as a CT or a shunt resistor is generally used. However, such a current sensor has a problem that it is relatively expensive and increases the cost of the power conversion device (1).

  On the other hand, as a characteristic part of the present embodiment, a reactor (L) is provided between the converter circuit (11) and the ground side of the smoothing capacitor (12). And the voltage (henceforth a reactor voltage) applied to this reactor (L) is detected by a voltage detection part (21).

  The reactor voltage detected by the voltage detection unit (21) is transmitted as a signal to an inverter control unit (25) described later, and converted into a current value (reactor current). This current value is used when generating a control signal for the switching element such that the current waveform on the power supply side approaches a sine wave having a predetermined shape (for example, a sine wave having the same phase as the voltage). Accordingly, it is not necessary to provide an expensive current sensor for detecting the current on the power source side as in the conventional case, and thus the cost of the power conversion device (1) can be reduced. Here, when the current is obtained from the reactor voltage as described above, an error becomes a problem. However, in the power conversion device (1) including the small-capacity smoothing capacitor (12) as described above, the power supply harmonics are reduced. In order to do this, it is only necessary to detect the waveform of the current on the power supply side, so there is no problem even if the above error occurs.

  In addition, if the ground side of the smoothing capacitor (12) and the ground of the inverter control unit (25) are at the same potential, the reactor (L) is connected to the converter circuit (11) and the smoothing capacitor (11) as described above. By providing it between the ground side of 12), the voltage on one end side of the reactor (L) becomes almost zero. Therefore, if only the voltage on the converter circuit (11) side of the reactor (L) is detected by the voltage detector (21), the reactor voltage can be easily obtained. Furthermore, since only the voltage at one end of the reactor (L) needs to be detected by the voltage detector (21), it is caused by the detection accuracy as compared with the case of detecting the voltage at both ends of the reactor (L). The variation is reduced, and the switching elements (Su, Sv, Sw, Sx, Sy, Sz) in the inverter circuit (13) can be controlled with high accuracy.

The power converter (1) includes an inverter control unit (25) for controlling the switching elements (Su, Sv, Sw, Sx, Sy, Sz) of the inverter circuit (13). The inverter control unit (25) includes a reactor voltage VL detected by the voltage detection unit (21), currents id and iq flowing in the three-phase AC motor (3), and a current in the three-phase AC motor (3). voltage command Vd * based on such rotational speed ω of the rotor ^to generate Vq ^*, the voltage commands Vd ^*, Vq ^* the switching element based on (Su, Sv, Sw, Sx , Sy, Sz) to And a control signal is output.

Specifically, the inverter control unit (25), the voltage commands ^Vd *, the voltage command generator for generating a Vq ^* and (26), the voltage command generation unit (26) The generated voltage commands ^Vd *, Vq A switching control unit (27) that generates a control signal for the switching elements (Su, Sv, Sw, Sx, Sy, Sz) based on ^* and outputs a signal to a gate drive circuit (not shown). Although not particularly illustrated, the inverter control unit (25) also includes a current calculation unit that obtains the reactor current iL from the reactor voltage VL detected by the voltage detection unit (21). In this current calculation part, the reactor current iL is calculated from the reactor voltage VL by the following equation.

As shown in FIG. 3, the voltage command generator (26) compares the rotational speed ω and the target rotational speed ω ^* to obtain a command torque T ^* (torque command value), and a speed controller (31) A current command generator (32) that generates a current command id ^* , iq ^* (current command value) in consideration of a current compensation amount to be described later on the command torque T ^* , and the current command id ^* , iq ^* and actual In consideration of currents id and iq flowing through the three-phase AC motor (3), a current control unit (33) that generates voltage commands Vd ^* and Vq ^* , and a reactor voltage detected by the voltage detection unit (21) A controller (34) for calculating the current compensation amount by comparing the reactor current iL obtained from the above with the target current iL ^* when the current waveform is sinusoidal. The controller (34) is configured to perform PI control, for example.

That is, the speed controller (31) generates and outputs a command torque T ^* such that the current rotational speed ω of the rotor of the three-phase AC motor (3) reaches the target rotational speed ω ^*. It is configured. In addition, the controller (34) performs current compensation so that the reactor current waveform obtained from the reactor voltage detected by the voltage detector (21) becomes a sine waveform (a waveform of a predetermined target current). It is configured to calculate and output the quantity. Thereby, in the current command generator (32), in addition to the command torque T ^* determined from the rotational speed ω, the current calculated from the reactor voltage, that is, the waveform of the current on the power source side approaches a sine wave, Current commands id ^* and iq ^* are generated.

Then, the current control unit (33) causes the currents id and iq flowing through the three-phase AC motor (3) to reach the current commands id ^* and iq ^* in consideration of the command torque T ^* and the current waveform on the power source side. Such voltage commands Vd ^* and Vq ^* are generated.

  With the above configuration, the switching elements (Su, Sv, Sw, Sx, Sy, Sz) in the inverter circuit (13) can be driven and controlled so that the waveform of the current on the power supply side approaches a sine wave. Harmonics resulting from the power supply frequency can be reduced.

-Effect of Embodiment 1-
As described above, according to this embodiment, the reactor (L) is provided between the converter circuit (11) and the ground side of the smoothing capacitor (12), and the reactor voltage is detected by the voltage detector (21). Therefore, the inverter circuit (13) is switched so that the harmonics on the power supply side are reduced by using the current value obtained from the voltage detected by the voltage detection unit (21) without detecting the current on the power supply side. The elements (Su, Sv, Sw, Sx, Sy, Sz) can be driven and controlled. Therefore, since an expensive current sensor as in the prior art is not required, the cost of the power conversion device (1) can be reduced.

  Moreover, as described above, by providing the reactor (L) on the ground side of the smoothing capacitor (12), the voltage at one end of the reactor (L) becomes almost zero, so the voltage at the other end By detecting only the reactor voltage, it becomes possible to detect the reactor voltage. Therefore, with the above-described configuration, the reactor voltage can be easily detected, and the detection accuracy of the reactor voltage can be improved by reducing the number of voltage detection locations. Therefore, the inverter circuit (13) can be controlled with higher accuracy by a simpler configuration.

Further, when the controller (34) obtains the current compensation amount so that the reactor current obtained from the reactor voltage becomes a sine wave, and the current command generator (32) generates the current commands id ^* and iq ^*. By taking the current compensation amount into consideration, the current waveform on the power supply side can be reliably brought close to a sine wave.

-Modification of Embodiment 1-
As shown in FIG. 4, this modification is different from the first embodiment only in the part that takes into account the amount of current compensation obtained by the controller (34) in the voltage command generator (41). In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different parts will be described. In this modification, the voltage command generation unit (41) is used in place of the voltage command generation unit (26) of the embodiment.

Specifically, as shown in FIG. 4 above, the current compensation amount obtained by the controller (34) is the correction value for the current commands id ^* and iq ^* generated by the current command generator (42). To do. That is, the current command input to the current control unit (43) is the current compensation amount with respect to the current commands id ^* and iq ^* generated by the current command generation unit (42) based on the command torque T ^*. The value is corrected by.

  Even with such a configuration, similarly to the first embodiment, the inverter circuit (13) can be controlled so that the waveform of the current obtained from the reactor voltage approaches a sine wave.

<< Embodiment 2 >>
FIG. 5 shows a schematic configuration of the voltage command generation unit (51) of the power conversion device according to the second embodiment. The configuration of the second embodiment is different from the configuration of the first embodiment in that the inverter circuit (13) is controlled so that the voltage waveform becomes a desired waveform without converting the reactor voltage into a current. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and only different portions will be described. In the second embodiment, the voltage command generator (51) is used in place of the voltage command generator (26) of the first embodiment.

Specifically, as shown in FIG. 5, the voltage command generator (51) calculates the voltage compensation amount from the voltage VL detected by the reactor (L) and the voltage VL ^* at which the voltage waveform becomes a desired waveform. The required controller (52) is provided. That is, the controller (52) corrects the correction value (voltage) so that the waveform of the voltage VL detected by the reactor (L) becomes a desired waveform (a waveform of a predetermined target voltage) corresponding to a sinusoidal current waveform. Compensation amount) is obtained. The voltage VL ^* at which the voltage waveform becomes a desired waveform is obtained by the following equation, where iL ^* is a current at which the current waveform on the power source side becomes a sine wave.

The voltage compensation amount obtained by the controller (52) is used as a correction value for the voltage commands Vd ^* and Vq ^* generated by the current controller (53).

-Effect of Embodiment 2-
As described above, according to this embodiment, since the voltage compensation amount obtained from the reactor voltage is directly corrected with respect to the voltage commands Vd ^* and Vq ^* , the time delay due to calculation and the like is reduced, and the inverter circuit has higher accuracy. (13) can be controlled. Therefore, the harmonics of the current on the power supply side can be more reliably reduced.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

  In each of the above embodiments, the single-phase AC power source (2) is used as the AC power source. However, the present invention is not limited to this, and a three-phase AC power source (102) may be used as shown in FIG. As a matter of course, in this case, the converter circuit (111) needs to be configured by six diodes (D1 to D6). FIG. 7 is a diagram showing a waveform of a DC link voltage when a three-phase AC power supply (102) is used. In this example, the waveform of the DC link voltage is substantially the same as a waveform obtained by full-wave rectification of a three-phase alternating current. However, depending on the capacity of the smoothing capacitor (12), the bottom of the waveform becomes smoother than this state due to the action of the smoothing capacitor (12), as in the example of the single-phase AC shown in the first embodiment.

  Moreover, in each said embodiment, although the voltage detection part (21) is comprised so that only one of the both ends of a reactor (L) may be detected, it is not this limitation, The reactor (L) You may be comprised so that the voltage of both ends may be detected.

Moreover, in the said Embodiment 1 and its modification, although the electric current compensation amount calculated | required with the controller (34) is made into the correction value with respect to instruction | command torque T ^* , electric current instruction id ^* , iq ^* , it is not restricted to this, Voltage Correction values for the commands Vd ^* and Vq ^* may be used. The current compensation amount may be a correction value for a plurality of command values among the command torque T ^* , the current commands id ^* , iq ^*, and the voltage commands Vd ^* , Vq ^* .

Furthermore, in the second embodiment, the voltage compensation amount obtained by the controller (52) is a correction value for the voltage commands Vd ^* and Vq ^* , but is not limited to this, and the command torque T ^* , current command id ^* , It may be a correction value for iq ^* . The voltage compensation amount may be a correction value for a plurality of command values among the command torque T ^* , the current commands id ^* , iq ^*, and the voltage commands Vd ^* , Vq ^* .

  As described above, the present invention includes a smoothing capacitor having a capacitance capable of smoothing the voltage fluctuation caused by the switching frequency of the inverter circuit, although the voltage fluctuation caused by the power supply voltage cannot be smoothed. Useful for power converters.

DESCRIPTION OF SYMBOLS 1 Power converter 2 AC power supply 3 Three-phase AC motor 11 Converter circuit (converter part)
12 Smoothing capacitor (capacitor)
13 Inverter circuit (inverter part)
21 Voltage detection unit 25 Inverter control unit 26, 41, 51 Voltage command generation unit 27 Switching control unit 31 Speed control unit 32 Current command generation unit 33, 43, 53 Current control unit 34, 42, 52 Controller Su, Sv, Sw , Sx, Sy, Sz Switching element L Reactor

Claims (5)

A converter unit (11) connected to the AC power source (2) for rectifying the AC power of the AC power source (2) into DC power and a plurality of switching elements (Su, Sv, Sw, Sx, Sy, Sz) An inverter unit (13) for converting the output power of the converter unit (11) into AC power of a predetermined frequency by the switching operation of the switching elements (Su, Sv, Sw, Sx, Sy, Sz), and the converter A capacitor (12) provided on the output side of the section (11),
A reactor (L) provided between the converter unit (11) and the ground side of the capacitor (12);
A voltage detector (21) for detecting a reactor voltage applied to the reactor (L);
An inverter control unit (25) that controls the inverter unit (13) based on the reactor voltage detected by the voltage detection unit (21). The power conversion device according to claim 1,
The inverter control unit (25) is arranged so that the reactor current waveform obtained from the reactor voltage detected by the voltage detection unit (21) approaches the waveform of a predetermined target current with less harmonics. 13) A power conversion device characterized by controlling. The power conversion device according to claim 2,
The inverter control unit (25) includes a controller (34) that calculates a current compensation amount so that a deviation between the reactor current and the target current is small, and the current compensation amount is calculated based on a torque command value (T ^* ), A power converter characterized by being added to at least one of a current command value (id ^* , iq ^* ) and a voltage command (Vd ^* , Vq ^* ). The power conversion device according to claim 1,
The inverter control unit (25) controls the inverter unit (13) so that the waveform of the reactor voltage detected by the voltage detection unit (21) approaches a waveform of a predetermined target voltage. Power conversion device. The power conversion device according to claim 4,
The inverter control unit (25) includes a controller (52) that calculates a voltage compensation amount so that a deviation between the reactor voltage and the target voltage is small, and the voltage compensation amount is calculated based on a torque command value (T ^* ), A power converter characterized by being added to at least one of a current command value (id ^* , iq ^* ) and a voltage command (Vd ^* , Vq ^* ).

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