WO2000019590A1 - Convertisseur de puissance - Google Patents

Convertisseur de puissance Download PDF

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Publication number
WO2000019590A1
WO2000019590A1 PCT/JP1999/004292 JP9904292W WO0019590A1 WO 2000019590 A1 WO2000019590 A1 WO 2000019590A1 JP 9904292 W JP9904292 W JP 9904292W WO 0019590 A1 WO0019590 A1 WO 0019590A1
Authority
WO
WIPO (PCT)
Prior art keywords
main circuit
current
voltage
control device
detection means
Prior art date
Application number
PCT/JP1999/004292
Other languages
English (en)
Japanese (ja)
Inventor
Tetsuo Kojima
Eiichi Toyota
Kiyoshi Nakata
Wataru Miyake
Mutsuhiro Terunuma
Masato Suzuki
Satoru Inarida
Original Assignee
Hitachi, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi, Ltd. filed Critical Hitachi, Ltd.
Priority to AU50669/99A priority Critical patent/AU5066999A/en
Priority to JP2000572985A priority patent/JP3843422B2/ja
Publication of WO2000019590A1 publication Critical patent/WO2000019590A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control

Definitions

  • the present invention relates to a power converter for controlling current and voltage in an inverter / converter as control information, and more particularly to a power converter having a high noise level and a high noise level used in railway vehicles.
  • a power converter for controlling current and voltage in an inverter / converter as control information, and more particularly to a power converter having a high noise level and a high noise level used in railway vehicles.
  • FIGS. 22 and 23 Block diagrams of this conventional inverter device are shown in FIGS. 22 and 23 of the publication.
  • the output current and the DC voltage of the inverter are detected by the current sensor and the voltage sensor, and the detected signals are fed-packed to the control board 800 in the form of analog signals.
  • the analog signal thus fed back is converted into a digital signal by an AZD converter built in the microcomputer 801 in the control board, and is used as control information.
  • power converters for electric vehicles have a higher main circuit voltage than the general-purpose inverters, and therefore have a greater noise level due to switching. If control information is transferred as an analog signal in such a noisy environment, noise may occur. Also, in a control circuit arranged near the main circuit that is a source of noise, providing an analog circuit such as an AD converter circuit in the control circuit causes noise contamination. In order to prevent such noise contamination, it is conceivable to physically separate the control circuit from the main circuit that is the source of the noise.
  • an object of the present invention is to provide a power conversion device that achieves both noise resistance and downsizing even in an environment where the main circuit voltage is high and the noise level generated by the main circuit is large, such as an electric car. It is in. Disclosure of the invention
  • the present invention provides a main circuit that converts direct current into alternating current or alternating current, a control device that controls the main circuit, and a plurality of detection units that detect current or voltage in the main circuit.
  • an AZD converter circuit (analog circuit) for A / D-converting the detected signal is not required in the control device, and the noise resistance can be increased.
  • the control device can be arranged near the main circuit, which is a source of noise, and the size of the entire power converter can be reduced.
  • FIG. 1 is a block diagram of a power conversion device (an inverter device for an electric vehicle) showing a first embodiment of the present invention.
  • FIG. 2 is a detailed configuration diagram of the motor current sensor unit in FIG.
  • FIG. 3 is a specific implementation configuration diagram of FIG.
  • FIG. 4 is a detailed configuration diagram of the control device in FIG.
  • FIG. 5 is a diagram showing the contents of the detection data transmitted in FIG.
  • FIG. 6 is a block diagram of a power converter (an inverter of an electric vehicle) showing a second embodiment of the present invention.
  • FIG. 7 is a block diagram of a power conversion device (an inverter device of an electric vehicle) showing a third embodiment of the present invention.
  • FIG. 1 is a block diagram showing an outline of a configuration of an inverter device of an electric vehicle that drives DC motor 6 by converting DC power into AC power.
  • the inverter device is connected to a main circuit 3 including a switching element (IGBT element) for converting the DC voltage V d into three-phase motor currents iu, iv, and iw, and a DC side of the main circuit 3,
  • a filter capacitor 4 that supplies DC power to the main circuit 3 and smoothes it, and generates a modulation factor based on an operation command from the driver's cab 5, a detected motor current, and a filter capacitor voltage, and generates the modulation factor.
  • the driver's cab 5 outputs operation commands such as power command, regenerative command, notch signal, and brake command. This operation command is transmitted to the control device 1 by the serial transmission cable 9C.
  • the AC motor 6 that drives the electric car is connected to the AC side of the main circuit 3. ing.
  • the main circuit 3 contains six IGBT elements, ie, two poles on each of the three phases XP and ⁇ of UVW, ie, two poles. Therefore, six gate signals b are sent from the gate drive 2 to the main circuit 3, and similarly, PWM pulse information a sent from the control device 1 to the gate drive 2 is sent via six signal lines.
  • a DC voltage sensor (PT) 7 for detecting the terminal voltage Vd of the filter capacitor 4 is provided, and on the AC side, the instantaneous values of the motor currents iu, iv, iw are detected.
  • a motor current sensor unit 8 is provided.
  • Each sensor 7, 8 is provided with input and output terminals as connection terminals for serial signal transmission.
  • the output connection terminal of the DC voltage sensor (PT) 7 and the input connection terminal of the motor current sensor unit 8 are connected by the serial transmission cable 9 A, and the output connection terminal of the sensor unit 8 is connected to the control device.
  • 1 input connection terminal is connected by serial transmission cable 9B.
  • the cab 5 and the DC voltage sensor (PT) 7 may be connected by a serial transmission cable.
  • Each sensor 7 and 8 has a function of converting the detected analog signal to a digital signal by the built-in A / D conversion function (because all sensors are connected by a continuous serial transmission cable). It has a serial interface function that arbitrates the access right of the serial signal line so that the sensor output does not collide, and time-divisionally serializes the AZD-converted digital signal and outputs it serially.
  • the arbitration method for the access right of the serial signal line and an operation example of the serial interface will be described with reference to FIG.
  • FIG. 2 is a detailed configuration diagram of the motor current sensor unit 8 in FIG.
  • the motor current sensor unit 8 includes current detection devices 81a to 811, which detect the instantaneous values of the motor currents iu, iv, and iw, respectively, and a frequency band for limiting the frequency band as pre-processing when performing AZD conversion.
  • Filter devices 82a to 82c, AZD converters 83a to 83c for converting analog signals to digital signals, and serial interface for AZD-converted data sequentially
  • Buffers 84a to 84c to temporarily wait for data to be sent to 85, and serial output by serially dividing the motor current value converted to a digital signal into time signals while arbitrating access rights to the serial signal line It consists of a serial interface 85 with the function of Although not shown, the serial interface 23 has a buffer for temporarily waiting a signal from the A / D converter 22.
  • the current detectors 8 1 a to 8 1 c make use of the Hall effect and are measured by passing the currents 11 11, i V, and i w detected in the rings 81 1 & to 81 1 (respectively.
  • the filter devices 82a to 82c are provided to limit the frequency band of the detected signal to less than half the sampling frequency of the AZD converters 83a to 83c.
  • serial transmission cables 9A and 9B are connected to the power line 91 and the ground line.
  • serial transmission cables 9A and 9B are connected to the motor current sensor unit 8 to supply necessary power in addition to signal wiring. The power is supplied from the control device 1.
  • the motor current sensor unit 8 not only converts the instantaneous value of the detected motor current into an AZD and sends it, but also performs a predetermined calculation (for example, an overcurrent detection operation). The data after applying the effective value calculation etc. may be sent.
  • the current detectors 8 1 a to 81 c in FIG. 2 are replaced with voltage detectors, and the voltage detector, filter, and AZD It is assumed that there is only one converter and one buffer, and the other configurations remain the same.
  • FIG. 3 shows a specific mounting configuration diagram (exploded perspective view) of the circuit configuration of FIG.
  • the control device 1, gate drive 2, and main circuit module 30 (including the main circuit 3) are housed in a case where the projected figure from above is almost the same.
  • the module 30 (including the main circuit 3), the cable drive 2, the controller 1, and the cover 10 of the controller 1 are arranged in this order.
  • concave portions are provided on the side surfaces of these devices, and these concave portions are combined with the convex portions of the filter capacitor 4 and the motor current sensor unit 8.
  • the control device 1, the gate drive 2, the main circuit module 30, and the sensors 7, 8 are shown separately, but they are integrated.
  • a printed board 11 mounted with a microcomputer for performing an inverter control device described in detail in FIG. 4 and an electro-optical conversion element for outputting a PWM pulse is mounted inside the control device 1. It is fixed in a state of being floated by a holder 12 from above. Ventilation holes 13 are provided on both sides of the control device 1 to cool the printing plate 11, and the printing plate 11 is placed near the center of the height of the ventilation port 13. ing. Two serial transmission cable connection terminals 14a and 14b are provided on the front of control unit 1. Although not shown, the PWM pulse information a is transmitted to the gate drive 2 on the bottom of the control device 1. An electro-optic conversion element (EZO) is installed.
  • EZO electro-optic conversion element
  • a printed circuit board 21 on which the gate circuit is mounted is fixed to the case of the gate drive 2 in a state of being lifted from the case of the gate drive 2 by the holder 22 similarly to the control device 1. I have. Also, an optical-electrical conversion element (OZE) 23 is installed to receive the PWM pulse information a. Although not shown, a gate signal connector for transmitting a gate signal b to the main circuit module 30 is attached to the bottom of the gate drive 2.
  • the optical / electrical conversion element (EZO) of the control device 1 and the optical / electrical conversion element (OZE) 23 of the gate drive 2 are provided with an optical fiber for electrical insulation between the two devices 1 and 2. They are connected by a fiber cable and transmit the PWM pulse information a by optical signals.
  • a gate signal connector 31 for receiving the re-gating signal b from the gate drive 2 and a DC signal from the filter capacitor 4 terminals 41 a and 41 b
  • DC voltage terminals 32 a and 32 b (for three phases) for receiving voltage V d and DC voltage V d stabilized by filter capacitor 4 are used for three-phase motor currents iu and iv , Iw, and a motor current terminal 33 (for three phases) for supplying motor currents iu, iv, and iw to the AC motor 6.
  • the main circuit 3 is composed of a total of six power semiconductor elements on the three-phase XP side and the ZN side, and connects the terminals of the P-side and N-side power semiconductor elements for each of the three phases (bus bar). According to 4, the motor current terminal 33 and the DC voltage terminals 32a and 32b are connected, and the motor current terminal 33 is connected to the motor current cable 301.
  • the main circuit 3 for the electric vehicle has a cooling device such as a fin. Holes are drilled in the bottom of the main circuit module 30 to attach them.
  • a DC voltage sensor (PT) 7 for measuring the terminal voltage Vd of the filter capacitor 4 is mounted on the upper portion of the filter capacitor 4.
  • the DC voltage sensor (PT) 7 does not necessarily need to be arranged above the filter capacitor 4, and may be below or beside the filter capacitor 4 as long as it is near the filter capacitor 4. The reason why the filter capacitor 4 is arranged near the main circuit module 30 is to shorten the wiring distance.
  • the DC voltage sensor (PT) 7 may be integrated with the filter capacitor 4 as an integral part, or may be fixed as a separate part by a screw or the like.
  • the DC voltage sensor (PT) 7 has two serial transmission cable terminals 71a and 71b, which are connected to the serial transmission cable connection terminals of another sensor (motor current sensor unit 8). Shall be.
  • the motor current sensor unit 8 passes through the three holes of the motor current sensor unit 8 through the cables 301 of the motor currents i u, i v, and i w, respectively.
  • the motor current sensor unit 8 has two serial transmission cable connection terminals 81a and 81b, each of which has a serial transmission cable connection terminal 71a of a DC voltage sensor (PT) 7 and a control device 1 Shall be connected to the serial transmission cable connection terminal 14b.
  • PT DC voltage sensor
  • the DC side and the AC side of the main circuit 3 are provided on the same side of the main circuit module 30.
  • the AC line 301 is provided from the filter capacitor 4 side of the main circuit module 30. Have been.
  • the current sensor unit 8 is arranged near the main circuit 3 (main circuit module 30), that is, near the root of the AC line 301 (main circuit 3 side). It is arranged between the sensor 4 and the main circuit module 30. Also, the gate signal The signal connector 31 is provided in the main circuit module 30 at a position opposite to the AC side of the main circuit 3 with the main circuit 3 interposed therebetween.
  • FIG. 4 is a detailed configuration diagram of the control device 1 in FIG. (I)
  • the control device 1 includes a serial interface 101a for converting a serial signal operation command and various protection signals transmitted from the cab 5 via the serial transmission cable 9C into parallel signal information.
  • Serial transmission cable
  • the control unit 102 includes storage devices 105a and 105a in which the control information of the parallel signal converted by the serial interfaces 101a and 101b is written.
  • the pulse output device 103 is a device that handles digital signals.
  • the CPU 106 refers to the storage device 105a and generates a torque command or a speed command control command from the power line, regenerative command, notch signal, brake command, etc. sent from the cab 5.
  • Control command generation unit 107 which generates a time series pattern of current command from the generated control command, and current reading which reads current by referring to storage device 105b. Section 109, the current command value generated by the current command generation section 108, and the current reading section 109.
  • the instantaneous current control unit 110 that controls the current based on the current detection value read from the current reading unit, and the speed that estimates the rotational speed of the motor from the current detection value read by the current reading unit 109.
  • the voltage calculated by the estimating unit 1 1 1, the phase calculating unit 1 1 2 that calculates the phase by integrating the motor rotation speed estimated by the speed estimating unit 1 1 1, and the instantaneous current control unit 1 1 0 It is composed of a modulation rate calculator 113 that calculates the remodulation rate from the pattern and the phase calculated by the phase calculator 112 and transmits the calculated modulation rate to the pulse output device 103.
  • the electro-optical conversion element (E ZO) unit 104 is composed of six electro-optical conversion elements (E ZO).
  • the pulse output device 103 is connected to these six electro-optical conversion elements (EZO).
  • control unit 102 is composed of a general-purpose CPU 106 and storage devices 105a and 105b, but this is not always necessary.
  • 02 may be configured by a one-chip LSI such as a gate array or ASIC.
  • Fig. 5 shows the structure of data transmitted on the serial transmission cable.
  • data of a serial bus structure called a frame is transmitted at a constant sampling cycle.
  • the serial transmission cables 9A and 9B are normally pulled up to the "H” level, but can be set to the "L” level for one bit period (this is called the start bit).
  • start bit the serial transmission cables 9A and 9B are normally pulled up to the "H” level, but can be set to the "L” level for one bit period (this is called the start bit).
  • start bit each sensor outputs data having a fixed data length onto the serial transmission cable 9 according to the order of the ID (identification number).
  • the ID setting may be fixedly provided with a dip switch for each sensor, or automatically detected by detecting the device connected on the serial transmission cable when the power is turned on. You can assign an ID.
  • the sensors 7 and 8 constantly monitor the state on the serial transmission cable 9 and wait for the "L" level (start bit).
  • the write current on the serial transmission cable 9 is given to the U-phase motor current of ID-0 for a certain period immediately after the end of the start bit, during which the A / D converted U-phase Outputs the instantaneous value of the motor current iu in a time-sharing manner.
  • the write right on the serial transmission cable 9 Since the write right on the serial transmission cable 9 is given only during the period, the instantaneous value of the AZD-converted V-phase motor current i V is output in a time-sharing manner.
  • the arbitration of writing on the serial transmission cable 9 is performed as described above, but the reading on the serial transmission cable can be freely performed.
  • the device 1 can also obtain control information by continuing to read data in the order of the sensor ID after the start bit.
  • the detected voltage or current in the main circuit is immediately converted to a digital signal and transmitted to the control device, which is at least a main function of the control device.
  • the control function that uses voltage or current as control information is digitized. Therefore, even if noise is affected during transmission between the sensor and the control device, the influence of noise on the control device can be reduced. Also, the noise resistance of the control device itself can be increased. As described above, by increasing the noise resistance, the control device and the transmission cable between the control device and the sensor can be arranged near the main circuit that is a source of the noise. Therefore, it is possible to reduce the number of wires and downsize the entire power converter. (In the present embodiment, all the control functions in the control device are digitized by transmitting the detected voltage and current as digital signals to the control device.)
  • control device since the control function using voltage or current as control information as described above can be digitized, the control device also has an effect of being resistant to thermal fluctuations (analog circuits are used). Vulnerable to thermal fluctuations).
  • a sensor for detecting current or voltage has a built-in AZD conversion function for converting a detected analog signal to a digital signal, digital transmission between the sensor and the control device is performed, and the control device is digitized. I have.
  • the power converter can be reduced without providing shields in the transmission cable connecting the sensor and the controller and the main circuit, since the influence of noise on the controller can be reduced. It also facilitates outfitting.
  • At least the control function that uses voltage or current as control information which is a main function of the control device, can be digitized, so that noise resistance can be increased. For this reason, by increasing the noise resistance of the control device, the control device can be arranged near the main circuit, which is a source of noise, and the cable between the devices can be shortened.
  • the heat generated in the main circuit is larger than that of a general-purpose inverter device, and the inverter device is operated in a cycle such as driving, coasting, and regenerating (in this case, the inverter). Since the equipment is operating at full power only during regenerative operation), large heat fluctuations occur in a relatively short cycle. Analog circuits are vulnerable to thermal fluctuations due to changes in characteristics such as resistance and capacitors depending on temperature.
  • the main circuit module 30 (including the main circuit 3), the gate drive 2, and the control device 1 are provided with concave portions on their side surfaces. And the projection of the filter capacitor 4 and the motor current sensor unit 8, so that the power converter can be made compact.
  • the three-phase motor current is collectively detected by the motor ⁇ current sensor unit 8 without providing a sensor for detecting each of the three-phase motor currents. This eliminates the need for a transmission cable between the control device and the sensor or a serial transmission cable connecting between the sensor and the sensor.
  • the transmission between the sensor and the control device is performed serially, the number of signal lines can be reduced.
  • the plurality of sensors have an AZD conversion function of converting a detected analog signal into a digital signal and a function of serially outputting the converted digital signal in a time-division manner. (Serial interface), and these multiple sensors and the control device are connected in series by a serial transmission cable. Can be greatly reduced. Also, since serial transmission is used, the number of signal lines can be significantly reduced as compared with parallel transmission. These reductions also have the advantage of facilitating wiring and connecting cables.
  • each sensor and control device in series with a serial transmission cable (control device is the end), it is easy to add sensors.
  • a new sensor may be added during testing to confirm control performance. Examples include vibration sensors for measuring ride comfort, sound level meters, temperature sensors in the main circuit, and air flow meters for cooling air in the control box.
  • vibration sensors for measuring ride comfort
  • sound level meters for measuring ride comfort
  • temperature sensors in the main circuit for measuring temperature
  • air flow meters for cooling air in the control box.
  • sensor information is taken into the control unit, it can be added to the end of the chain of serial connection of the existing sensor using a serial transmission cable, or it can be interrupted halfway. There is no need to provide a signal input section (connector) in the system.
  • the information of the above sensors can be easily transmitted on the vehicle using the on-vehicle monitoring function described in the preceding paragraph.
  • the distance of the entire transmission cable can be shortened and generated from the main circuit 3. Noise that is picked up by the transmission cable is reduced.
  • the filter device since the sensor has a built-in filter device, differences in the output and pressure level of various sensors can be dealt with on the sensor side. The hardware does not need to be changed. That is, conventionally, the filter device is built in the control device, and the filter device is converted or adjusted according to the output voltage of the sensor. However, in this embodiment, the filter device is provided with a filter. Since the device is built-in, it can be handled only by converting each sensor.
  • the DC side and the AC side of the main circuit 3 are provided on the same side of the main circuit module 30, and the AC line 301 is connected to the main circuit module 30. It is provided from the filter capacitor 4 side.
  • the high-voltage side wiring should be integrated by combining the connector that takes in the DC voltage from the filter capacitor and the connector that takes out the motor current (including the AC line 301) into one side of the main circuit module 30. (It is desirable to separate high-voltage wiring and low-voltage wiring from the viewpoint of insulation measures and noise measures).
  • the current sensor unit 8 is arranged near the main circuit 3 (close to the main circuit module 30 (close to the root of the AC line 301 on the main circuit 3 side). Therefore, there is no need to remove a part of the shield in the middle of the AC line 301.
  • the AC line In the case of high-voltage, large-current AC lines, the AC line is usually passed through a ferrite core. It is necessary to take measures against electromagnetic induction such as winding the shield of the AC line, etc. For this reason, it is necessary to remove some of the shield to mount the sensor on the AC line. It is not preferable to remove the part in order to prevent electromagnetic induction interference).
  • the current sensor unit 8 is disposed between the filter capacitor 4 and the main circuit module 30, the DC voltage sensor (PT) 7 To connect the current sensor unit 8 to Transmission cable 9 A can be wired short.
  • the gate signal connector 31 is located at a position opposite to the AC side of the main circuit 3 with the main circuit 3 interposed therebetween.
  • the three-phase gate signal and motor current wiring distance is shortened because the arrangement from the gate signal connector 31 to the semiconductor element (IGBT element) and the AC line outlet is arranged in a straight line.
  • the switching speed of the semiconductor device (IGBT device) can be increased.
  • the wiring of each phase does not cross each other, it is not affected by the switching of other phases.
  • a fiber cable is used for optical transmission of the PWM signal from the control device 1 to the gate drive 2, but the light emitting part and the light receiving part are opposed to each other. If optical transmission is performed directly, a fiber cable becomes unnecessary, and the inverter device can be made more compact.
  • FIG. 6 shows a second embodiment of the present invention, in which a single control device and a main circuit convert DC power into AC power and drive the plurality of motors in an inverter device of an electric vehicle. An outline of the configuration is shown in the block diagram.
  • the inverter device according to the present embodiment has the same configuration as that of the first embodiment.
  • the difference from the first embodiment is that two motors 6a and 6b are driven by the main circuit 3 to detect the motor currents iul, ivl, iwl and iu2, iv2, iw2.
  • the DC voltage sensor (PT) 7, the sensor unit 8b, the sensor unit 8a, and the control device 1 are connected in series by serial transmission cables 9D to 9F.
  • Fig. 6 two motors are driven by one controller and main circuit. Although an example of operation is shown, in a normal electric vehicle, four or eight motors are often driven by one controller and main circuit. In the case of driving a plurality of motors in this way, a normal electric vehicle does not have a current sensor for each motor, and for example, the U-phase is connected to the main circuit 3 side from the point where the U-phase motor currents iu1 and iu2 are branched. In most cases, the same number of current sensors as in the case of a single motor can be used by arranging the same motor current sensors and using the same arrangement for the V and W phase motor currents.
  • the value detected by the motor current sensor is the sum of the motor currents of the plurality of motors. Even when estimating the rotation speed of the motor from the motor current, the value of the rotation speed of the plurality of motors is calculated. You can only get the average value. At this point, the rotation speed of the motor actually varies depending on the radius of the wheels connected to the motors and the road surface conditions, etc. Sometimes you want to get the maximum or minimum value. For this purpose, it is necessary to provide a current sensor for each motor. However, if a current sensor is provided for each motor, the number of motors X three-phase current sensors are required, and the same number of And the same number of transmission cables as the number of connection terminals and sensors.
  • the DC voltage sensor 7 and the motor current sensor units 8a and 8b include an AZD converter and a serial interface. Since the device 1 is connected in series by serial transmission cables 9D to 9F, the number of input terminals on the control device side is not increased, and the outfitting of the power conversion device is not complicated. Fine spin control is possible.
  • the three-phase motor Since a motor current sensor unit that detects current collectively is used, fine-grained sliding control can be performed simply by adding this motor current sensor according to the number of motors.
  • a sensor having a built-in A / D converter may be provided for each phase, and these sensors may be connected in series with a serial transmission cable.
  • Fig. 7 is a block diagram showing the outline of the configuration of an electric vehicle converter that converts AC power into DC power by a converter and supplies DC power to the inverter of an electric vehicle that drives the AC motor. It is shown in the figure.
  • the converter device in the present embodiment includes a main circuit 3C including a switching element (IGBT element) for rectifying the AC voltage V of the AC power supply 70 and converting it into a DC voltage Vd, and an AC voltage of the AC power supply.
  • v, the AC current i, and the terminal voltage V d of the filter capacitor 4 as control information generate an AC voltage command, convert it into PWM pulse information c, and output it to the gate drive 2C.
  • a gate drive 2C that converts the PWM pulse information c output from the control device IC into a gate signal d of a switching element in the main circuit 3C.
  • a single-phase AC power supply 70 and a reactor 71 for holding the AC voltage V of the AC power supply 70 are provided. Is provided with a filter capacitor 4 for holding the DC voltage Vd converted by the main circuit 3C.
  • AC voltage sensor (PT) 72 On the AC side of the main circuit 3C, there are an AC voltage sensor (PT) 72 that detects the (instantaneous value) of the AC voltage of the AC power supply 70, and an AC current that flows into the main circuit 3C from the reactor 71.
  • An AC current sensor (CT) 73 is provided to detect the instantaneous value of the current.
  • a DC voltage sensor (PT) 7 for detecting the terminal voltage Vd of the filter capacitor 4 is provided on the DC side.
  • AC voltage sensor (PT) 72, AC current sensor (CT) 73, AC current sensor (CT) 73, DC voltage sensor (PT) 7, and DC voltage sensor (PT) 7 and control device 1 C are connected in series via serial transmission cables 9G to 10I, respectively.
  • the sensors 72 and 73 have the same structure as that of FIG. 2 described in the first embodiment.
  • timing of the output from each sensor to the serial transmission cable 9 (9G to 9I) and the configuration of the data transmitted on the serial are also the first embodiment (Fig. 5). This is the same as that described in.
  • the present invention is applicable to a three-phase converter.
  • AC power supply Since the number of power supply lines increases to three, it is advisable to arrange AC voltage sensors and AC current sensors as necessary.
  • the configuration of the control device does not change except for the type and number of sensors, that is, the control device for the inverter device and the converter device can be shared.
  • each of the inverter device and the converter device has been described.
  • the inverter shown in FIG. 1 or FIG. 6 and the inverter shown in FIG. 7
  • the main circuit 3 and the main circuit 3 C are connected on the DC side to each other via a filter capacitor 4.
  • the DC voltage sensor (PT) 7 for detecting the filter capacitor voltage has two input connection terminals and two output connection terminals.
  • the sensor and the It forms part of a series body consisting of a controller and a serial transmission cable.
  • DC Two pressure sensors (PT) 7 for the converter and for the inverter may be provided, and in each of the inverter and the converter, the sensor and the control device may be connected in series by a serial transmission cable.
  • motor current AC current
  • instantaneous value of AC voltage Sending an instantaneous value means sampling and transmitting at a time interval sufficient to reproduce the waveform (at least 10 times the frequency of the original waveform).
  • the fundamental frequency is 50 to 60 Hz, so sampling is performed at 500 to 600 Hz or more, which is a time interval sufficient to reproduce the AC voltage waveform. Will be transferred.
  • the DC voltage Vd of the filter capacitor has a small time change compared to the motor currents iu, iv, iw of the inverter device, the AC current i of the AC power supply, and the AC voltage ⁇ . Therefore, it is not necessary to transfer the DC voltage V d of the filter capacitor at the same sampling period as the motor currents i u, i V, i w.
  • the DC amount with a small time change such as the DC voltage V d of the filter capacitor
  • the AC amount with a large time change such as the motor currents iu, iV, iw, the AC current i of the AC power supply, and the AC voltage V.
  • the importance of control is lower than that, and the AC amount is more susceptible to noise than the DC amount. Therefore, the AC amount such as the motor currents iu, iv, iw, etc. is taken in as a digital signal, but the DC voltage Vd is set to the AZD conversion function in the control device 1 as in the past, and the DC voltage Vd is A hybrid configuration, such as taking in analog signals as they are, is also possible.
  • control device 1 includes an analog circuit, but the main function of the control device 1 has little effect.
  • Industrial applicability it is possible to provide a power converter that is resistant to noise and that can be miniaturized in an environment where the main circuit voltage is high, such as a railway vehicle, and the noise level generated by the main circuit is large. Most suitable for conversion equipment. However, if noise resistance is required, it can be used in a wide range of fields other than railway vehicles (general-purpose inverters, electric vehicles, etc.).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention se rapporte à un convertisseur de puissance comportant un circuit principal conçu pour transformer un courant continu en courant alternatif et inversement, une unité de commande conçue pour commander le circuit principal, et une pluralité de dispositifs permettant de détecter un courant ou une tension dans le circuit principal, ledit courant détecté ou ladite tension détectée générant des données de commande transmises à l'unité de commande. Ce convertisseur de puissance se caractérise en ce que le dispositif de détection comporte un organe de conversion A/N permettant de transformer un signal analogique détecté en un signal numérique et un dispositif permettant de délivrer le signal numérique converti en série par division dans le temps, ledit dispositif de détection étant relié en série avec l'unité de commande par un câble de transmission en série de sorte que l'unité de commande se trouve en position terminale. Un signal détecté est numérisé par une section de détection et envoyé de ladite section de détection vers l'unité de commande. De ce fait, il n'est pas nécessaire que l'unité de commande comporte un circuit convertisseur A/N (circuit analogique) aux fins de conversion A/N d'un signal détecté, ce qui permet d'accroître la résistance aux bruits. Grâce à cet accroissement de la résistance aux bruits de l'unité de commande, il est possible de disposer ce dernier près du circuit principal, qui est une source de bruit, et il est possible de réduire la taille globale du convertisseur de puissance.
PCT/JP1999/004292 1998-09-30 1999-08-09 Convertisseur de puissance WO2000019590A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU50669/99A AU5066999A (en) 1998-09-30 1999-08-09 Power converter
JP2000572985A JP3843422B2 (ja) 1998-09-30 1999-08-09 電力変換装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP9804414 1998-09-30
JPPCT/JP98/04414 1998-09-30

Publications (1)

Publication Number Publication Date
WO2000019590A1 true WO2000019590A1 (fr) 2000-04-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/004292 WO2000019590A1 (fr) 1998-09-30 1999-08-09 Convertisseur de puissance

Country Status (3)

Country Link
JP (1) JP3843422B2 (fr)
AU (1) AU5066999A (fr)
WO (1) WO2000019590A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217838A1 (de) * 2002-04-22 2003-11-13 Hans Joachim Bruins Messanordnung, insbesondere für spektroskopische Messungen an partikelförmigen Proben
JP4614020B1 (ja) * 2009-06-12 2011-01-19 三菱電機株式会社 車両用電力変換装置
WO2011033567A1 (fr) * 2009-09-17 2011-03-24 東芝三菱電機産業システム株式会社 Appareil de conversion de puissance électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06141550A (ja) * 1992-10-19 1994-05-20 S G:Kk インバータ装置及びモータ制御システム
JPH06311760A (ja) * 1993-04-15 1994-11-04 Hitachi Ltd インバータ装置
JPH08140204A (ja) * 1994-11-08 1996-05-31 Matsushita Electric Ind Co Ltd 組電池の監視装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06141550A (ja) * 1992-10-19 1994-05-20 S G:Kk インバータ装置及びモータ制御システム
JPH06311760A (ja) * 1993-04-15 1994-11-04 Hitachi Ltd インバータ装置
JPH08140204A (ja) * 1994-11-08 1996-05-31 Matsushita Electric Ind Co Ltd 組電池の監視装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10217838A1 (de) * 2002-04-22 2003-11-13 Hans Joachim Bruins Messanordnung, insbesondere für spektroskopische Messungen an partikelförmigen Proben
JP4614020B1 (ja) * 2009-06-12 2011-01-19 三菱電機株式会社 車両用電力変換装置
WO2011033567A1 (fr) * 2009-09-17 2011-03-24 東芝三菱電機産業システム株式会社 Appareil de conversion de puissance électrique
JP5502091B2 (ja) * 2009-09-17 2014-05-28 東芝三菱電機産業システム株式会社 電力変換装置
US8787054B2 (en) 2009-09-17 2014-07-22 Toshiba Mitsubishi-Electric Industrial Systems Corporation Electric power conversion apparatus
EP2479881A4 (fr) * 2009-09-17 2016-12-21 Toshiba Mitsubishi-Electric Ind Systems Corp Appareil de conversion de puissance électrique

Also Published As

Publication number Publication date
AU5066999A (en) 2000-04-17
JP3843422B2 (ja) 2006-11-08

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