JP2018109539A - Connection phase recognition device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection phase recognition device capable of suitably recognizing which phase each line in which a three-phase alternating current power supply outputs electric power corresponds to.SOLUTION: A connection phase recognition device includes: a switching identification part for identifying time when a level of a converter current detected by a current transformer connected to at least one of three lines is switched, based on three different voltage phases in the three lines connected to a three-phase alternating current power supply in a power supply system; an integrated value calculation part for calculating an integrated value of the converter current based on the time when the level of the converter current is switched; and a line phase identification part for identifying which line of the three lines corresponding to the three different voltage phases the line to which the current transformer is connected is based on the integrated value of the converter current.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connection phase recognition device, a control method, and a program.

  Motors are used in many devices such as compressor motors in air conditioners. These motors may be driven using an inverter. The inverter can generate an AC control signal having a frequency suitable for each motor from the DC signal, and is suitable for controlling the rotational speed of the motor (see, for example, Patent Document 1 or 2).

JP 2002-262595 A JP 2005-003626 A

  However, in order to use an inverter in a device, it is necessary to generate a DC signal from an AC signal from a commercial power source using a rectifier circuit or the like. At this time, the rectifier circuit generates a harmonic signal whose frequency is the frequency of the AC signal.

Therefore, for example, for household electrical appliances and general-purpose products, JIS C 61000-3-2 (Electromagnetic compatibility-Part 3-2: Limit value-Harmonic current generation limit value (input power per phase is 20 amps or less) is applied to prevent the occurrence of harmonic interference.
One method for suppressing harmonic signals is to use a device called an active filter. The active filter is an apparatus that detects an AC signal in each wiring of the three-phase AC power supply and operates to cancel the harmonic signal based on the detected AC signal. For this reason, when the active filter and each wiring of the three-phase AC power supply are not properly connected, the harmonic signal may not be appropriately suppressed.

  Therefore, a technology that can appropriately recognize which phase each wiring of the three-phase AC power supply corresponds to is required.

  An object of the present invention is to provide a connection phase recognition device, a control method, and a program that can solve the above-described problems.

  According to the first aspect of the present invention, the connection phase recognizing device has at least one of the three wirings based on the phases of three different voltages in the three wirings connected to the three-phase AC power supply in the power supply system. A switching specifying unit for specifying a time at which a magnitude of a converter current detected by a current transformer connected to one is switched; and an integral value for calculating an integral value of the converter current based on the time at which the magnitude of the converter current is switched. A wiring phase specification that specifies which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected based on an integral value of the calculation unit and the converter current A section.

  According to the second aspect of the present invention, in the connection phase recognition device according to the first aspect, the switching specifying unit specifies a half cycle of the three-phase AC voltage based on a time at which the converter current is switched, The integral value calculating unit calculates an integrated value of the converter current in the half cycle, and the wiring phase specifying unit is configured to connect the wiring to which the current transformer is connected based on the integrated value of the converter current in the half cycle. You may specify which of the three wirings corresponding to three different voltage phases.

  According to a third aspect of the present invention, in the connection phase recognition device according to the first aspect, the switching specifying unit specifies one cycle of the three-phase AC voltage based on a time at which the converter current is switched, The integral value calculation unit calculates an integral value of the converter current in a half cycle of the one cycle and an integral value of a current obtained by inverting the converter current in the remaining half cycle of the one cycle, The wiring phase identification unit is based on an integrated value of the converter current in a half cycle of the one cycle and an integrated value of a current obtained by inverting the converter current in the remaining half cycle of the one cycle. The wiring to which the current transformer is connected may specify which of the three wirings corresponding to the three different voltage phases.

  According to a fourth aspect of the present invention, in the connected phase recognition device according to the second aspect or the third aspect, the switching specifying unit is a time shifted by a predetermined offset time from each of the times when the converter current is switched. The integral value calculation unit may calculate an integral value of the converter current based on a time shifted by the predetermined offset time.

  According to a fifth aspect of the present invention, in the connection phase recognition device according to any one of the first to fourth aspects, the wiring to which the current transformer is connected by the wiring phase identification unit is the three different voltages. A wiring information writing unit that writes a specific result indicating which of the three wirings corresponding to the phase of the current wiring to a storage unit that stores a correspondence relationship between the current transformer and the wiring. May be.

  According to a sixth aspect of the present invention, in the connection phase recognition device according to any one of the first to fifth aspects, the wiring to which the current transformer is connected by the wiring phase identification unit is the three different voltages. A notification unit that outputs a warning when a specific result indicating which of the three wirings corresponding to the phase of the phase is different from the correspondence stored in the storage unit may be provided.

  According to the seventh aspect of the present invention, the control method includes at least one of the three wirings based on the phases of three different voltages in the three wirings connected to the three-phase AC power supply in the power supply system. Identifying the time at which the magnitude of the converter current detected by the current transformer connected to is switched, calculating the integrated value of the converter current based on the time at which the magnitude of the converter current is switched, and the converter current Identifying which of the three wirings corresponding to the phases of the three different voltages is the wiring to which the current transformer is connected based on the integral value of

  According to the eighth aspect of the present invention, the program stores at least one of the three wirings based on the phases of three different voltages in the three wirings connected to the three-phase AC power supply in the power supply system. Identifying the time at which the magnitude of the converter current detected by the current transformer connected to one is switched, calculating the integrated value of the converter current based on the time at which the magnitude of the converter current is switched, Based on the integral value of the converter current, the wiring to which the current transformer is connected is identified from among the three wirings corresponding to the three different voltage phases.

  According to the connection phase recognition device according to the embodiment of the present invention, it is possible to appropriately recognize which phase each wiring from which the three-phase AC power supply outputs power corresponds to.

It is a figure which shows the structure of the motor drive device by one Embodiment of this invention. It is a figure which shows the structure of the active filter by one Embodiment of this invention. It is a block diagram which shows the structure of the information processing apparatus which implement | achieves the active filter by one Embodiment of this invention. It is a figure which shows the processing flow of the motor drive device by one Embodiment of this invention. It is a 1st figure for demonstrating specification of the phase in the wiring which the switching specific part by one Embodiment of this invention performs. It is a 2nd figure for demonstrating specification of the phase in the wiring which the switching specific part by one Embodiment of this invention performs. It is a figure for demonstrating calculation of the integral value of the converter current which the integral value calculation part by one Embodiment of this invention performs. It is a figure for demonstrating specification of the phase in the wiring which the wiring phase specific | specification part by one Embodiment of this invention performs. It is a figure which shows an example of the determination table which the memory | storage part by one Embodiment of this invention memorize | stores. It is a figure which shows the structure of the motor drive device by another embodiment of this invention.

<Embodiment>
Hereinafter, a configuration of a motor driving device according to an embodiment of the present invention will be described.
As shown in FIG. 1, the motor drive device 1 includes a three-phase AC power source 10, a system voltage detection unit 20, a converter current detection unit 30, a noise filter 40, a diode module 50, a smoothing capacitor 60, An intelligent power module 70, a compressor motor 80, an active filter 90, a current correcting unit 100, and a smoothing reactor 110 are provided.

  The three-phase AC power supply 10 outputs three AC voltages (R phase, S phase, and T phase) that are different in phase by 120 degrees. The three-phase AC power supply 10 is a commercial power supply, for example.

  The system voltage detection unit 20 is a wiring for supplying the R-phase voltage output from the three-phase AC power supply 10 to the noise filter 40, a wiring for supplying the S-phase voltage to the noise filter 40, and a T-phase voltage to the noise filter 40. A voltage is detected in each of the supplied wirings.

Converter current detection unit 30 includes a current transformer 301a and a current transformer 301b.
The current transformer 301 a detects the magnitude and direction of the R-phase current supplied from the three-phase AC power supply 10 to the noise filter 40.
The current transformer 301 b detects the magnitude and direction of the T-phase current supplied from the three-phase AC power supply 10 to the noise filter 40. Note that the phase of the R-phase current is the same as the phase of the R-phase voltage. The phase of the T-phase current is the same as the phase of the T-phase voltage. The sum of the R-phase current, the S-phase current, and the T-phase current is always zero. Therefore, the magnitude and direction of the S-phase current can be calculated from the detection results of the R-phase current and the T-phase current. The phase of the S phase is the same as the phase of the S phase voltage.

  The noise filter 40 removes high frequency components of several tens [kHz] or more such as noise components in the three wires of the three-phase AC power supply 10.

  The diode module 50 rectifies each of the R-phase current, the S-phase current, and the T-phase current to generate a DC voltage. The diode module 50 is, for example, a three-phase bridge circuit.

The smoothing capacitor 60 removes high frequency components in the DC voltage generated by the diode module 50.
The AC voltage output from the three-phase AC power supply 10 is converted into a DC voltage by the noise filter 40, the diode module 50, and the smoothing capacitor 60. That is, the noise filter 40, the diode module 50, and the smoothing capacitor 60 constitute a converter.

  The intelligent power module 70 generates a three-phase AC voltage for driving the compressor motor 80 from the DC voltage generated by the diode module 50. The intelligent power module 70 is an inverter, for example.

Based on the voltage detected by the system voltage detector 20 and the current detected by the converter current detector 30, the active filter 90 converts each of the R-phase voltage, the S-phase voltage, and the T-phase voltage into a sine wave. This is a functional unit that specifies a correction current for correction and transmits a correction signal indicating the magnitude of the specified correction current to the current correction unit 100.
Specifically, when the current correction unit 100 is a terminal, the active filter 90 generates a current itself that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring as a correction signal. A correction signal is supplied to the current correction unit 100.
Specifically, when the current correction unit 100 newly generates a current corresponding to the correction signal, the active filter 90 uses, for example, a voltage in the R-phase wiring, the S-phase wiring, and the T-phase wiring as the correction signal. The digital signal of several bits indicating the current that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring is generated based on the current and the current, and the correction signal is transmitted to the current correction unit 100. Since the impedance in the R-phase wiring, S-phase wiring, and T-phase wiring is known in advance, the active filter 90 can know the current that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring. It is also possible to generate a digital signal of several bits indicating the current.

Based on the correction signal from the active filter 90, the current correction unit 100 causes a current to flow through the R-phase wiring, the S-phase wiring, and the T-phase wiring.
Specifically, when the current correction unit 100 is a terminal, the current correction unit 100 receives from the active filter 90 the current itself that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring, The received current is passed through the R-phase wiring, the S-phase wiring, and the T-phase wiring, thereby canceling the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring.
Specifically, when the current correction unit 100 newly generates a current corresponding to the correction signal, a current that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring from the active filter 90. A digital signal of several bits indicating is received. Then, the current correction unit 100 generates a current that cancels the harmonic current in the R-phase wiring, the S-phase wiring, and the T-phase wiring indicated by the received digital signal, and the generated current is used as the R-phase wiring and the S-phase wiring. To the T-phase wiring.
As a result, a current having a sine wave waveform with less distortion is realized at the output of the three-phase AC power supply 10, that is, at the most upstream part of the motor drive device 1.
In FIG. 1, the current correction unit 100 and the system voltage detection unit 20 have a partially common configuration in the same place in the R-phase wiring, the S-phase wiring, and the T-phase wiring.

The smoothing reactor 110 is provided between the smoothing capacitor 60 and the diode module 50. The smoothing reactor 110 keeps the current during the energization period of the converter current input to the converter constant.
Note that the smoothing reactor 110 may not be provided as long as the current during the energization period of the converter current is kept constant within an allowable range.

  The active filter 90 has a function of recognizing which phase wiring the system voltage detection unit 20 and the converter current detection unit 30 are connected to. Specifically, as shown in FIG. 2, the active filter 90 (connected phase recognition device) includes a switching specifying unit 901, an integral value calculating unit 902, a wiring phase specifying unit 903, and a wiring information writing unit 904. A compensation current specifying unit 906, a current compensation unit 907, and a storage unit 908.

Based on the phases of three different voltages in the three wirings of the R phase wiring, the S phase wiring, and the T phase wiring connected to the three-phase AC power supply 10 in the power supply system, the switching specifying unit 901 The time at which the magnitude of the converter current detected by the current transformer connected to at least one of the wirings is switched is specified.
In one embodiment of the present invention, the switching specifying unit 901 includes the current phase in the current transformer 301a to be connected to the R-phase wiring by design and the T-phase wiring by design. The time at which the magnitude of the converter current input to the converter is switched is specified based on the phase of the current in the current transformer 301b to be connected to.

  The integral value calculation unit 902 calculates the integral value of the converter current based on the time when the magnitude of the converter current is switched. The time at which the magnitude of the converter current is switched can be determined based on the system voltage correlated with the magnitude of the converter current. Examples of the time at which the magnitude of the converter current is switched include the time at which two of the three voltages in the system voltage become the same voltage, the time indicated by the zero cross point of the system voltage, and the like.

  The wiring phase identification unit 903 identifies, based on the integral value of the converter current, the wiring to which the current transformer is connected is the wiring through which the current of the R phase, S phase, or T phase flows.

  The wiring information writing unit 904 determines whether the wiring connected to each of the current transformer 301a and the current transformer 301b by the wiring phase specifying unit 903 is a wiring through which a current of R phase, S phase, or T phase flows. The specific result shown is written in the storage unit 908. That is, the wiring information writing unit 904 determines the correspondence between the current transformer 301a and the phase of the wiring to which the current transformer 301a is connected, and the correspondence between the current transformer 301b and the phase of the wiring to which the current transformer 301b is connected. To the storage unit 908.

  Based on the voltage detected by the system voltage detection unit 20 and the current detected by the converter current detection unit 30, the compensation current specifying unit 906 sine-waves each of the R-phase voltage, the S-phase voltage, and the T-phase voltage. Each of the R-phase correction current, the S-phase compensation current, and the T-phase compensation current is specified so as to be corrected.

The current compensation unit 907 receives a correction signal including the magnitude of the R-phase correction current, the magnitude of the S-phase correction current, and the magnitude of the T-phase correction current identified by the compensation current identification unit 906. To 100.
The storage unit 908 stores various information necessary for processing performed by the active filter 90.

Next, the configuration of the information processing apparatus that implements the active filter 90 will be described.
FIG. 3 is a block diagram showing the configuration of the information processing apparatus that implements the active filter 90 according to the embodiment of the present invention. The active filter 90 is realized by using, for example, a general computer 200 shown in FIG. The computer 200 includes a CPU (Central Processing Unit) 201, a RAM (Random Access Memory) 202, a ROM (Read Only Memory) 203, a storage device 204, an external I / F (Interface) 205, a communication I / F 206, and the like.

  The CPU 201 is an arithmetic device that realizes each function of the computer 200 by storing a program or data stored in the ROM 203 or the storage device 204 in the RAM 202 and executing processing. The RAM 202 is a volatile memory used as a work area for the CPU 201. The ROM 203 is a non-volatile memory that retains programs and data even when the power is turned off. The storage device 204 is realized by, for example, an HDD (Hard Disk Drive), an SSD (Solid State Drive), and the like, and stores an OS (Operation System), application programs, various data, and the like.

  In the active filter 90, each of the switching specifying unit 901, the integral value calculating unit 902, the wiring phase specifying unit 903, the wiring information writing unit 904, the compensation current specifying unit 906, the current compensating unit 907, and the storage unit 908 is stored by the CPU 201, for example. This is realized by executing a control program stored in the device 204.

  The external I / F 205 is an interface with an external device. Examples of the external device include a recording medium 207. The computer 200 can read and write to the recording medium 207 via the external I / F 205. The recording medium 207 includes, for example, an optical disk, a magnetic disk, a memory card, a USB (Universal Serial Bus) memory, and the like.

Next, processing of the motor drive device 1 including the active filter 90 will be described.
Here, the processing flow of the motor drive device 1 shown in FIG. 4 will be described.
Note that the connection destination recognized by the active filter 90 as the R phase, the connection destination recognized as the S phase, and the connection destination recognized as the T phase are different.

The switching specifying unit 901 recognizes any one of the three wirings of the output of the three-phase AC power supply 10 as an R phase, an S phase, or a T phase (step S1).
Specifically, the switching specifying unit 901 recognizes the wiring to which the terminal a1 is connected in the active filter 90 illustrated in FIG. That is, the switching specifying unit 901 regards the terminal a1 as being connected to the R-phase wiring even if the terminal a1 is actually connected to the S-phase or T-phase wiring. Note that the wiring identification performed by the switching specifying unit 901 here determines a reference phase for determining whether or not the wiring phase is correct. As will be described later, the switching specifying unit 901 determines whether the recognition of the phase of each wiring is correct based on this criterion, and if it is determined that there is an error in the recognition of the phase of the wiring, Correct the handling of data so that

The switching specifying unit 901 acquires the voltage in the recognized phase wiring and the two voltages in the wiring other than the recognized phase wiring from the system voltage detection unit 20.
Specifically, when the switching specifying unit 901 recognizes the wiring connected to the terminal a1 in the active filter 90 shown in FIG. 1 as the R phase, the voltage in the wiring connected to the terminal a1 is set to the system voltage detection unit 20. Get from. In addition, the switching specifying unit 901 acquires from the system voltage detection unit 20 the voltages in the connection destination wirings of the terminals a2 and a3 in the active filter 90 shown in FIG.

The switching specifying unit 901 compares the voltage in the recognized phase wiring with two voltages in the wiring other than the recognized phase wiring (step S2).
Specifically, when the switching specifying unit 901 recognizes the connection destination wiring of the terminal a1 in the active filter 90 as the R phase, the voltage in the connection destination wiring of the terminal a1 obtained from the system voltage detection unit 20, The voltage in the wiring to which the terminal a2 is connected is compared. In addition, the switching specifying unit 901 compares the voltage in the connection destination wiring of the terminal a1 acquired from the system voltage detection unit 20 with the voltage in the connection destination wiring of the terminal a2.

  Based on the comparison result indicating the magnitude relationship between the voltages obtained by comparing the voltage in the recognized phase wiring and the two voltages in the wiring other than the recognized phase wiring, the switching specifying unit 901 A phase in the wiring is specified (step S3).

Specifically, when the connection destination wiring of the terminal a1 is recognized as the R phase, the switching specifying unit 901 obtains the voltage in the R phase wiring that is the connection destination of the terminal a1 obtained from the system voltage detection unit 20. Assuming that the voltage V1 shown in FIG. Further, it is assumed that the switching specifying unit 901 has acquired the voltage V2 illustrated in FIG. 5 as the voltage in the connection destination wiring of the terminal a2 acquired from the system voltage detection unit 20. Furthermore, it is assumed that the switching specifying unit 901 has acquired the voltage V3 illustrated in FIG. 5 as the voltage in the connection destination wiring of the terminal a3 acquired from the system voltage detection unit 20.
At this time, the switching specifying unit 901 specifies the times at which two of the voltages V1, V2, and V3 are the same. Note that the time at which two of the voltages V1, V2, and V3 become the same (the time at which the line voltage zero-crosses) is equal to the time at which the converter current is switched. The switching specifying unit 901 defines a period between the nearest times among the specified times as a period, and defines a period in which voltage V3> voltage V1> voltage V2, for example, as period 5 as shown in FIG. Further, as illustrated in FIG. 5, the switching specifying unit 901 defines a period in which voltage V <b>1> voltage V <b>3> voltage V <b> 2 as period 1. Similarly, as illustrated in FIG. 5, the switching specifying unit 901 defines a period in which voltage V1> voltage V2> voltage V3 as period 3 and voltage V2> voltage. Similarly, as shown in FIG. 5, the switching specifying unit 901 has a period in which voltage V2> voltage V1> voltage V3 as period 2, a period in which voltage V2> voltage V3> voltage V1 is in period 6, and voltage V3> voltage. A period in which V2> voltage V1 is defined as period 4.
The switching specifying unit 901 indicates that the change in the magnitude relationship among the voltage V1, the voltage V2, and the voltage V3 changes in the order of period 5 → period 1 → period 3 → period 2 → period 6 → period 4 → period 5. In this case, the connection destination wire of the terminal a1 is specified as the R phase, the connection destination wire of the terminal a2 is specified as the S phase, and the connection destination wire of the terminal a3 is specified as the T phase.
Further, when the switching specifying unit 901 indicates that the change in the magnitude relationship of the voltage V1, the voltage V2, and the voltage V3 changes in the order of period 5 → period 4 → period 6 → period 2 → period 3 → period 1 → period 5. In this case, the connection destination wiring of the terminal a1 is specified as the R phase, the connection destination wiring of the terminal a2 is specified as the T phase, and the connection destination wiring of the terminal a3 is specified as the S phase.

  Specifically, it is assumed that the switching specifying unit 901 has acquired the voltage V1 illustrated in FIG. 6 as the voltage in the connection destination wiring of the terminal a1 acquired from the system voltage detection unit 20. In addition, it is assumed that the switching specifying unit 901 has acquired the voltage V2 illustrated in FIG. 6 as the voltage in the connection destination wiring of the terminal a2 acquired from the system voltage detection unit 20. Further, it is assumed that the switching specifying unit 901 has acquired the voltage V3 illustrated in FIG. 6 as the voltage in the connection destination wiring of the terminal a3 acquired from the system voltage detection unit 20. In this case, the switching specifying unit 901 specifies the voltage V1 as the voltage in the R-phase wiring. In addition, the switching specifying unit 901 is within (1/12) cycle immediately after the time when the voltage V1 switches from a negative voltage to a positive voltage, that is, within (1/12) cycle immediately after the time indicated by the zero cross point. Then, the voltage V1 is compared with the voltage V2. The time indicated by the zero cross point is an example of a time shifted by a predetermined offset time with reference to the time when the converter current switches. When the switching specifying unit 901 determines that the voltage V1 is greater than the voltage V2 within (1/12) cycle immediately after the voltage V1 is switched from the negative voltage to the positive voltage, the voltage V2 is generated. The wiring to which the terminal a2 is connected is specified as the S-phase wiring. In addition, when the switching specifying unit 901 determines that the voltage V1 is smaller than the voltage V2 within (1/12) cycle immediately after the voltage V1 is switched from the negative voltage to the positive voltage, the voltage V2 is generated. The wiring to which the terminal a2 is connected is identified as the T-phase wiring. Similarly, the switching specifying unit 901 compares the voltage V1 and the voltage V3 within a (1/12) cycle immediately after the voltage V1 is switched from a negative voltage to a positive voltage. When the switching specifying unit 901 determines that the voltage V1 is greater than the voltage V3 within (1/12) cycle immediately after the voltage V1 is switched from the negative voltage to the positive voltage, the voltage V3 is generated. The wiring to which the terminal a3 is connected is specified as the S-phase wiring. Further, when the switching specifying unit 901 determines that the voltage V1 is smaller than the voltage V3 within the (1/12) cycle immediately after the voltage V1 is switched from the negative voltage to the positive voltage, the voltage V3 is generated. The wiring to which the terminal a3 is connected is identified as the T-phase wiring.

  The integral value calculation unit 902 calculates the integral value of the converter current based on the time when the magnitude of the converter current is switched (step S4).

Specifically, as illustrated in FIG. 5, the switching specifying unit 901 specifies the times at which two of the voltages V1, V2, and V3 are the same, and defines using the specified times. The calculation of the integrated value of the converter current will be described by taking as an example the case where the phase in each wiring is specified based on the magnitude relationship of the voltages in each wiring in the periods 1 to 6.
In this case, the switching specifying unit 901 specifies a predetermined period, for example, one cycle of the voltage output from the three-phase AC power supply 10 based on the time when the magnitude of the converter current is switched. As shown in FIG. 7, the phase relationship between the voltage output from the three-phase AC power supply 10 and the converter current is the same in any of the R phase, the S phase, and the T phase. Further, the R phase, the S phase, and the T phase are shifted from each other by 120 degrees. Therefore, it becomes a time when two of the voltages V1, V2, and V3 become the same at a time interval in which the phase changes by 60 degrees, and this time coincides with a time when the magnitude of the converter current is switched.

That is, the switching specifying unit 901 starts at any time when two of the voltages V1, V2, and V3 become the same, and from the time that becomes the starting point, of the voltages V1, V2, and V3. Until the time when the two voltages are detected to be the same three times is measured. In addition, the switching specifying unit 901 further measures the time until three times that the voltage V1, the voltage V2, and the voltage V3 are detected to be the same three times, so that the three-phase AC power supply 10 is One period of the output voltage can be specified.
At this time, the switching specifying unit 901 transmits an integration start signal to the integrated value calculation unit 902 when detecting the time as the starting point. Further, the switching specifying unit 901 transmits an integral inversion signal to the integral value calculating unit 902 when detecting that two of the voltage V1, the voltage V2, and the voltage V3 are the same three times. In addition, the switching specifying unit 901 further transmits an integration end signal to the integrated value calculating unit 902 when detecting that two of the voltages V1, V2, and V3 are the same three times.
The integral value calculation unit 902 integrates the converter current until receiving the integration inversion signal after receiving the integration start signal from the switching specifying unit 901. Further, the integral value calculation unit 902 cancels the offset of the converter current by reversing the integration until the integration end signal is received after receiving the integration inversion signal from the switching specifying unit 901, thereby canceling the offset of the converter current. The integral value of the converter current during one cycle of the voltage output from the AC power supply 10 can be calculated.

Further, the time interval at which two of the voltages V1, V2, and V3 are the same is the same as the time interval at which the phase of the voltage output from the three-phase AC power supply 10 changes by 60 degrees. Therefore, the switching specifying unit 901 starts at any time when two of the voltages V1, V2, and V3 become the same, and from the time that becomes the starting point, of the voltages V1, V2, and V3. It is possible to specify the half cycle of the voltage output from the three-phase AC power supply 10 by measuring until the time when the two voltages are detected to be the same three times.
At this time, the switching specifying unit 901 transmits an integration start signal to the integrated value calculation unit 902 when detecting the time as the starting point. In addition, the switching specifying unit 901 transmits an integration end signal to the integrated value calculating unit 902 when detecting that two of the voltages V1, V2, and V3 are the same three times.
The integral value calculation unit 902 integrates the converter current from the time when the integration specifying signal is received from the switching specifying unit 901 to the time when the integration end signal is received, so that the half-cycle of the voltage output from the three-phase AC power supply 10 is obtained. An integral value of the converter current can be calculated.

Specifically, as shown in FIG. 6, the switching specifying unit 901 specifies each time when the voltage V1 switches from a negative voltage to a positive voltage, and the specified time and the magnitude of the converter current are determined. The calculation of the integrated value of the converter current will be described by taking as an example the case where the difference from the switching time, that is, the offset time from the switching time of the converter current is specified as an example.
In this case, the switching specifying unit 901 determines the three-phase AC power source based on the difference between the time when the voltage V1 is switched from the negative voltage to the positive voltage, that is, the time indicating the zero cross point and the time when the magnitude of the converter current is switched. A predetermined period, for example, one period of the voltage output by 10 is specified. As can be seen from FIG. 7, the time when the voltage V1 switches from the negative voltage to the positive voltage is at the center of the period in which the converter current I1 flowing through the terminal a1 becomes zero during the change from the negative current to the positive current. It almost coincides with the time. That is, the time when the voltage V1 switches from a negative voltage to a positive voltage has an offset time corresponding to a phase difference of about 30 degrees from the time when the converter current I1 switches from zero to a positive current. It is also known that the magnitude of the converter current is switched at time intervals where the phase changes by 60 degrees. Therefore, the correspondence between the time when the voltage V1 is switched from the negative voltage to the positive voltage and the time when the magnitude of the converter current is switched is known in advance. Further, the time at which the voltage V1 is switched from a positive voltage to a negative voltage and the time at which the voltage V1 is switched from a negative voltage to a positive voltage are the difference in the half cycle of the voltage output from the three-phase AC power supply 10. I know that there is. Therefore, the correspondence relationship between the time when the voltage V1 is switched from the positive voltage to the negative voltage and the time when the magnitude of the converter current is switched is also known in advance.

That is, the switching specifying unit 901 starts at any time when two of the voltages V1, V2, and V3 become the same, and from the time that becomes the starting point, of the voltages V1, V2, and V3. Until the time when the two voltages are detected to be the same three times is measured. In addition, the switching specifying unit 901 further measures the time until three times that the voltage V1, the voltage V2, and the voltage V3 are detected to be the same three times, so that the three-phase AC power supply 10 is One period of the output voltage can be specified.
At this time, the switching specifying unit 901 transmits an integration start signal to the integrated value calculation unit 902 when detecting the time as the starting point. Further, the switching specifying unit 901 transmits an integral inversion signal to the integral value calculating unit 902 when detecting that two of the voltage V1, the voltage V2, and the voltage V3 are the same three times. In addition, the switching specifying unit 901 further transmits an integration end signal to the integrated value calculating unit 902 when detecting that two of the voltages V1, V2, and V3 are the same three times.
The integral value calculation unit 902 integrates the converter current until receiving the integration inversion signal after receiving the integration start signal from the switching specifying unit 901. Further, the integral value calculation unit 902 cancels the offset of the converter current by reversing the integration until the integration end signal is received after receiving the integration inversion signal from the switching specifying unit 901, thereby canceling the offset of the converter current. The integral value of the converter current during one cycle of the voltage output from the AC power supply 10 can be calculated.

In addition, the switching specifying unit 901 uses the time when the voltage V1 is switched from a negative voltage to a positive voltage, or the time when the voltage V1 is switched from a positive voltage to a negative voltage, that is, the time indicating the zero cross point. By using the offset time, it is possible to specify an arbitrary time when two of the voltage V1, the voltage V2, and the voltage V3 become the same. The switching specifying unit 901 starts at any time when two of the specified voltages V1, V2, and V3 become the same, and the voltage V1, the voltage V2, and the voltage V3 are determined from the starting time. It is possible to specify the half cycle of the voltage output by the three-phase AC power supply 10 by measuring until the time when three of the two voltages are the same is detected three times.
At this time, the switching specifying unit 901 transmits an integration start signal to the integrated value calculation unit 902 when detecting the time as the starting point. In addition, the switching specifying unit 901 transmits an integration end signal to the integrated value calculating unit 902 when detecting that two of the voltages V1, V2, and V3 are the same three times.
The integration value calculation unit 902 integrates the converter current until receiving the integration end signal after receiving the integration start signal from the switching specifying unit 901. Thereby, the integral value calculation part 902 can calculate the integral value of the converter current during the half cycle of the voltage which the three-phase alternating current power supply 10 outputs.
The integral value calculation unit 902 transmits the integral value of the integrated and added converter current to the wiring phase identification unit 903.

The wiring phase specifying unit 903 receives the integrated value of the converter current from the integrated value calculating unit 902.
The wiring phase specifying unit 903 is a wiring through which current of the R phase, S phase, or T phase flows through the wiring to which the current transformer is connected based on the integrated value of the converter current calculated by the integral value calculating unit 902. Whether or not there is is specified (step S5).
Specifically, for example, the integration value calculation unit 902 integrates the converter current as it is as shown in FIG. 8 until it receives the integration inversion signal after receiving the integration start signal from the switching specifying unit 901. The integration value calculation unit 902 shows the integration results from the reception of the integration start signal to the reception of the integration inversion signal, and the integration result from FIG. 8 until the integration end signal is received after the reception of the integration inversion signal from the switching specifying unit 901. As shown, the converter current is inverted and integrated results are added.
In this case, the wiring phase identification unit 903 reads the determination table TBL1 shown in FIG. 9 from the storage unit 908. The determination table TBL1 shown in FIG. 9 shows the correct integration value when the converter current shown in FIG. 8 is integrated for one period from 0 degrees to 360 degrees.
For example, when determining whether or not the connection of the current transformer 301a corresponding to the R-phase wiring is correct for the converter current shown in FIG. 8, the wiring phase specifying unit 903 determines the first half of I1 in FIG. Since the cycle is a positive current, the column of “R (positive)” in the determination table TBL1 is referred to. In the determination table TBL1, the first square in FIG. 8 is “1”, “+” represents a positive current value, and “−” represents a negative current value, that is, a current flowing in the reverse direction. Represents.
When the converter phase for the R phase shown in FIG. 8 is integrated from 0 degree to 360 degrees, the wiring phase specifying unit 903 "30" to 150 degrees "+8", 210 degrees to 330 degrees "+8" And the integral value of the R-phase converter current is calculated as “+16”. The wiring phase specifying unit 903 compares the calculated integrated value “+16” with “+16” in the column “R (positive)” in the determination table TBL1, and thus matches, that is, the current corresponding to the R-phase wiring. It is determined that the connection of the transformer 301a is correct. If there is no match in this comparison, the wiring phase specifying unit 903 determines that there is an error in the connection of the current transformer corresponding to the phase.
The wiring phase specifying unit 903 changes the phase range of the current transformer 301b corresponding to the T-phase wiring and performs the same determination.

  When the wiring information writing unit 904 confirms the phase of the wiring to which each of the current transformers is connected by the wiring phase specifying unit 903, the correspondence relationship between the terminals that detect the voltage from the actual system voltage detection unit 20 and the wirings, In addition, the correspondence between the actual current transformer and the wiring is written in the storage unit 908.

If the active filter 90 determines that the recognized connection is different from the actual connection, the current actual connection is not changed, and processing such as data replacement to match the actual connection in data processing. To perform correct data processing. For example, when the active filter 90 determines that the connection recognized as the R phase is actually connected to the S phase, the active filter 90 processes the data handled as the R phase data as the S phase data. , Perform correct data processing. And the active filter 90 produces | generates the signal which cancels the harmonic generated in the motor drive device 1, and reduces a harmonic distortion.
Specifically, the compensation current specifying unit 906 is based on the voltage detected by the system voltage detection unit 20 and the current detected by the converter current detection unit 30, the R phase voltage, the S phase voltage, and the T phase voltage. R-phase correction current, S-phase compensation current, and T-phase compensation current for correcting each of the sine wave into a sine wave are specified.
The current compensation unit 907 receives a correction signal including the magnitude of the R-phase correction current, the magnitude of the S-phase correction current, and the magnitude of the T-phase correction current identified by the compensation current identification unit 906. To 100.
Based on the correction signal from the active filter 90, the current correction unit 100 supplies current to the R-phase wiring, S-phase wiring, and T-phase wiring, and outputs the three-phase AC power supply 10, that is, the motor driving device 1. In the most upstream part, the voltage is corrected to a sine wave with little distortion.
At this time, the current correction unit 100 is switched to three terminals (not shown) different from the terminals a1 to a3, and currents are transferred from the three terminals to the R-phase wiring, the S-phase wiring, and the T-phase wiring. It is also possible to receive a control signal that causes a current to flow through the wiring. Further, as illustrated in FIG. 10, the current correction unit 100 has a configuration different from that of the system voltage detection unit 20, and current may be supplied from three terminals c <b> 1, c <b> 2, c <b> 3.

  In the above-described embodiment, the active filter 90 does not include the notification unit 905, but is not limited thereto. For example, in another embodiment, the active filter 90 includes a notification unit 905, and when the wiring phase identification unit 903 determines that there is an error in the connection of the current transformer, a warning signal indicating that there is an error is provided. The information may be transmitted to the notification unit 905, and the notification unit 905 may notify that there is an error in the connection of the current transformer according to the warning signal.

  As described above, the active filter 90 identifies the reference wiring by recognizing the wiring to which the terminal a1 is connected as the R-phase wiring in the process of step S1. Since the active filter 90 determines the S-phase wiring and the T-phase wiring based on the R-phase wiring, the number of determinations 6 for the three wirings in the normal case where the wiring reference is not determined (the number of combinations) 6) can be reduced to two determinations (two combinations) for two wirings.

In the above, the motor drive device 1 provided with the active filter 90 by one Embodiment of this invention was demonstrated.
In the active filter 90 according to the embodiment of the present invention, the switching specifying unit 901 includes three of three wirings of an R-phase wiring, an S-phase wiring, and a T-phase wiring connected to the three-phase AC power supply 10 in the power supply system. Based on the phases of the two different voltages, the time at which the magnitude of the converter current detected by the current transformer connected to at least one of the three wirings is switched is specified. The integral value calculation unit 902 calculates the integral value of the converter current based on the time when the magnitude of the converter current is switched. The wiring phase identification unit 903 identifies, based on the integral value of the converter current, the wiring to which the current transformer is connected is the wiring through which the current of the R phase, S phase, or T phase flows.
By doing so, the active filter 90 can appropriately recognize which phase each wiring from which the three-phase AC power supply 10 outputs electric power corresponds.

  Note that the active filter 90 according to one embodiment of the present invention includes the current transformer 301a corresponding to the R phase and the current transformer 301b corresponding to the T phase, but the active filter according to another embodiment of the present invention. 90 may include a current transformer corresponding to the S phase in addition to the current transformer 301a corresponding to the R phase and the current transformer 301b corresponding to the T phase. Further, the active filter 90 according to another embodiment of the present invention may include one current transformer and sequentially switch the connection to each of the R-phase wiring, the S-phase wiring, and the T-phase wiring.

  Note that the processing order of the processing according to the embodiment of the present invention may be changed within a range in which appropriate processing is performed.

  Each of the storage units may be provided anywhere as long as appropriate information is transmitted and received. Each of the storage units may exist in a range in which appropriate information is transmitted and received, and data may be distributed and stored.

  Although the embodiment of the present invention has been described, each of the motor drive devices 1 described above may have a computer system therein. The process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may realize part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

  Although several embodiments of the present invention have been described, these embodiments are examples and do not limit the scope of the invention. These embodiments may be variously added, omitted, replaced, and changed without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 1 ... Motor drive device 10 ... Three-phase alternating current power supply 20 ... System voltage detection part 30 ... Converter current detection part 40 ... Noise filter 50 ... Diode module 60 ... Smoothing capacitor 70 ... Intelligent power module 80 ... Compressor motor 90 ... Active filter 100 ... Current correction unit 110 ... Smoothing reactors 301a, 301b ... Current transformer 901 ... Switching specifying unit 902 ... Integration value calculation unit 903... Wiring phase specifying unit 904... Wiring information writing unit 905 .. reporting unit 906... Compensation current specifying unit 907.

Claims (8)

Based on the phases of three different voltages in three wirings connected to the three-phase AC power supply in the power supply system, the magnitude of the converter current detected by the current transformer connected to at least one of the three wirings is A switching specifying unit for specifying a switching time;
An integral value calculation unit that calculates an integral value of the converter current based on a time at which the magnitude of the converter current is switched;
A wiring phase specifying unit that specifies which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected based on an integral value of the converter current;
A connected phase recognition device. The switching specifying unit includes:
Based on the time when the converter current is switched, specify the half cycle of the three-phase AC voltage output by the three-phase AC power supply,
The integral value calculator is
Calculating an integral value of the converter current in the half cycle;
The wiring phase specifying part is
Identifying which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected based on an integral value of the converter current in the half cycle;
The connected phase recognition device according to claim 1. The switching specifying unit includes:
Identifying one cycle of the three-phase AC voltage output by the three-phase AC power source based on the time at which the converter current switches;
The integral value calculator is
Calculating an integrated value of the converter current in a half cycle of the one cycle and an integrated value of a current obtained by inverting the converter current in the remaining half cycle of the one cycle;
The wiring phase specifying part is
The current transformer is connected based on an integral value of the converter current in a half cycle of the one cycle and an integral value of a current obtained by inverting the converter current in the remaining half cycle of the one cycle. Identifying which of the three wirings corresponding to the phases of the three different voltages is
The connected phase recognition device according to claim 1. The switching specifying unit includes:
Identify a time offset by a predetermined offset time from each of the times when the converter current switches;
The integral value calculator is
Calculating an integral value of the converter current based on a time shifted by the predetermined offset time;
The connection phase recognition device according to claim 2 or claim 3. The identification result indicating which of the three wirings corresponding to the phases of the three different voltages is the wiring to which the current transformer is connected by the wiring phase specifying unit is the current transformer and the wiring. Wiring information writing unit for writing in the storage unit for storing the correspondence relationship of
The connected phase recognition device according to claim 1, further comprising: A correspondence result stored in the storage unit is a specification result indicating which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected by the wiring phase specifying unit. A notification unit that outputs a warning if they are different,
The connected phase recognition device according to claim 1, further comprising: Based on the phases of three different voltages in three wirings connected to the three-phase AC power supply in the power supply system, the magnitude of the converter current detected by the current transformer connected to at least one of the three wirings is Identifying when to switch,
Calculating an integral value of the converter current based on a time at which the magnitude of the converter current is switched;
Identifying which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected based on an integral value of the converter current;
Control method. On the computer,
Based on the phases of three different voltages in three wirings connected to the three-phase AC power supply in the power supply system, the magnitude of the converter current detected by the current transformer connected to at least one of the three wirings is Identifying when to switch,
Calculating an integral value of the converter current based on a time at which the magnitude of the converter current is switched;
Identifying which of the three wirings corresponding to the phases of the three different voltages is a wiring to which the current transformer is connected based on an integral value of the converter current;
A program that executes

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