WO2024047843A1 - Appareil onduleur - Google Patents

Appareil onduleur Download PDF

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Publication number
WO2024047843A1
WO2024047843A1 PCT/JP2022/032951 JP2022032951W WO2024047843A1 WO 2024047843 A1 WO2024047843 A1 WO 2024047843A1 JP 2022032951 W JP2022032951 W JP 2022032951W WO 2024047843 A1 WO2024047843 A1 WO 2024047843A1
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WIPO (PCT)
Prior art keywords
current
winding
field
inverter device
axis
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Application number
PCT/JP2022/032951
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English (en)
Japanese (ja)
Inventor
活徳 竹内
真琴 松下
雄一 坪井
優介 小杉
Original Assignee
東芝インフラシステムズ株式会社
東芝三菱電機産業システム株式会社
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.)
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Publication date
Application filed by 東芝インフラシステムズ株式会社, 東芝三菱電機産業システム株式会社 filed Critical 東芝インフラシステムズ株式会社
Priority to JP2022576014A priority Critical patent/JP7362950B1/ja
Priority to PCT/JP2022/032951 priority patent/WO2024047843A1/fr
Priority to CN202280079109.1A priority patent/CN118339758A/zh
Publication of WO2024047843A1 publication Critical patent/WO2024047843A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/022—Synchronous motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/32—Arrangements for controlling wound field motors, e.g. motors with exciter coils

Definitions

  • the present invention relates to an inverter device.
  • the stator of a synchronous machine is equipped with a general three-phase armature winding (distributed winding, concentrated winding, wave winding, etc.). Further, a field winding is provided on the rotor, and a field current is supplied through a slip ring or a brushless exciter.
  • torque field torque
  • the field magnetic flux can be freely adjusted by changing the field current, it is possible to always operate with a power factor of 1. Taking advantage of this advantage, it is mainly used as large-capacity motors of 1000 kW class or higher.
  • reactive power can also be freely controlled, leading to advance and delay control. For this reason, they are used as main generators in various power plants such as hydropower, thermal power, and nuclear power plants.
  • the rotor of the synchronous machine is provided with a short-circuit winding called a brake winding.
  • the damper winding is composed of a conductor rod (hereinafter referred to as a "damper bar”) that penetrates the iron core of the rotor, and a short-circuit ring that electrically connects each damper bar. Since no power source is connected to the damper winding, no current (damper current) flows during steady operation and there is no electrical effect.
  • a damper current is induced using the same principle as in the secondary winding of an induction machine.
  • Inductive torque is generated by the damper current, which can supplement the field torque, making it possible to self-start with acceleration using only commercial power.
  • induced torque is generated by the damper current during transient operation such as when the voltage or load suddenly changes. In this case, the induced torque is generated in a direction that resists fluctuations in voltage and load, so it is possible to suppress an increase in the load angle and improve the ability to withstand step-out. In this way, the brake winding is essential for stable operation of a synchronous machine.
  • the damper bar has a thin and long structure, so its mechanical strength is relatively weak. Synchronous machines are designed with the mechanical strength of the damper bar in mind, but in very rare cases, the damper bar breaks due to unexpected overload or deterioration over time. Since the damper bar is installed on the rotor core, it is usually not possible to visually determine a failure. If the rotor could be taken out from the stator, it would be possible to visually confirm the failure, but the weight of a 1000 kW class synchronous machine is extremely large, and disassembly work itself is not easy. Therefore, it is necessary to detect the breakage failure of the damper bar in a non-disassembled and non-destructive manner by some electrical method.
  • a method has been proposed that focuses on, for example, the one-sided component of the sideband and monitors the temporal change in the amplitude of the one-sided component of the current waveform during startup. Since the change in amplitude over time is different between when the damper bar is healthy and when it is broken, the aim is to detect breakage of the damper bar by measuring it every time it is started and analyzing its changes over time. Furthermore, instead of using the one-sided component of the current waveform, a method has been proposed in which detection is performed using the fact that the current amplitude at startup is reduced due to a breakage failure. Although these methods focus on different physical quantities, they are based on the same idea of ⁇ monitoring a specific physical quantity when the synchronous machine starts up, and detecting breakage based on the difference from the initial value.''
  • synchronous machines include not only those driven by commercial power sources but also those driven by inverters.
  • inverter-driven synchronous machines are used in synchronous machines that drive rolling mills in steel mills because they require precise torque control over a wide speed range.
  • variable voltage variable frequency (VVVF) power is supplied from the inverter, so slippage does not occur even when starting (accelerating). That is, the conventional method of monitoring physical quantities at the time of startup cannot be applied.
  • VVVF variable voltage variable frequency
  • An object of the present invention is to provide an inverter device that can detect breakage failure of a damper bar.
  • an inverter device includes a stator having an armature winding, a rotor core, a field winding, a plurality of damper bars, and a short circuit provided at both ends thereof.
  • an inverter device for driving a synchronous machine comprising: a rotor having a brake winding having a ring; an armature winding power converter for supplying power to the armature winding; It has a field winding power converter for supplying power to the field winding, and an armature current control system, and converts the three-phase current supplied by the armature winding power converter on the dq axis.
  • a simulator that calculates commands and field current commands used for control, and a brake winding failure detection device that detects a failure of the brake winding, and the brake winding failure detection device is configured to detect a failure of the inverter.
  • a switching unit that switches a state from a normal operation mode to a failure inspection mode and from the failure inspection mode to the normal operation mode; and a switch unit that switches the state from the normal operation mode to the failure inspection mode and from the failure inspection mode to the normal operation mode, and in the failure inspection mode, commands the d-axis current and the q-axis current in the normal operation mode.
  • a test current command value generation unit outputs a direct current equivalent value as the d-axis current command and an alternating current value as the q-axis current command, and measures a response signal at the field winding.
  • an inspection measurement/determination unit that determines whether or not there is a failure in the brake winding from the response signal.
  • FIG. 1 is a block diagram showing the configuration of an inverter device according to a first embodiment.
  • FIG. 2 is a cross-sectional view showing a configuration example of a synchronous machine targeted by the inverter device according to the first embodiment.
  • FIG. 2 is a perspective view showing an example of a brake winding of a synchronous machine targeted by the inverter device according to the first embodiment.
  • FIG. 2 is a configuration diagram for explaining the configuration and operation of a measurement/judgment section during inspection of the inverter device according to the first embodiment.
  • FIG. 3 is a flowchart showing the procedure of a damper bar breakage failure detection method using the inverter device according to the first embodiment.
  • FIG. 7 is a graph showing an example of the distribution of field voltage with respect to the current phase when the damper bar of the synchronous machine targeted by the inverter device according to the first embodiment is healthy and when a breakage failure has occurred.
  • Examples of the distribution of field voltage when the rotor electrical angle changes when the damper bar of the synchronous machine targeted by the inverter device according to the first embodiment is healthy and when a breakage failure has occurred are shown below.
  • This is a graph showing. The results are obtained through multiple inspections when the rotor electrical angle appears randomly, respectively, when the damper bar of the synchronous machine targeted by the inverter device according to the first embodiment is healthy and when the damper bar has a breakage failure.
  • 3 is a graph showing an example of a change in field voltage.
  • FIG. 7 is a configuration diagram for explaining the configuration and operation of an inspection measurement/judgment section of an inverter device according to a second embodiment.
  • FIG. 1 is a block diagram showing the configuration of an inverter device 100 according to the first embodiment.
  • the inverter device 100 is a drive device intended for the synchronous machine 1.
  • the input/output signal of each element is expressed, for example, as "angular velocity command” ⁇ * .
  • angular velocity command ⁇ *
  • the signal name and the signal level value are different things, it is correct to express them separately.
  • ⁇ * indicates the "angular velocity command signal” and also indicates the "level value of the angular velocity command signal”, and both are collectively expressed as "angular velocity command”. Note that the name and level value of the feedback signal are also shown together.
  • Inverter device 100 adjusts armature currents Iu, Iv, Iw, and field current if with respect to angular velocity command ⁇ * and magnetic flux command ⁇ * .
  • the inverter device 100 is roughly divided into an armature winding power converter 101, a field winding power converter 102, a speed control section 110, a field current control section 120, a simulator 130, and a brake winding failure detection device. It has 200.
  • the armature winding power converter 101 is a VVVF (variable voltage variable frequency) power source such as an inverter, and receives power from an AC power source such as a commercial power source (not shown), and converts the armature winding 22 of the synchronous machine 1 to supply power.
  • VVVF variable voltage variable frequency
  • the field winding power converter 102 is a DC power supply, receives power from an AC power supply (not shown), and supplies DC power to the field winding 13 of the synchronous machine 1.
  • the speed control unit 110 includes a subtracter 111, a speed calculator 112, a speed controller 113, and an armature winding current control system 110a.
  • the speed control unit 110 has a cascade control configuration including an armature winding current control system 110a as a minor loop for obtaining the corresponding torque current i T * under the speed control loop for obtaining the angular velocity command ⁇ * It becomes.
  • the speed control unit 110 outputs a voltage command to the armature winding power converter 101 through the armature winding current control system 110a, and converts the three-phase current supplied by the armature winding power converter 101 into dq Control on axis.
  • the armature winding current control system 110a includes a dq-axis current calculator 114, a subtracter 115, a subtracter 116, a 3-phase-dq converter 117, a dq-axis current controller 118, and a dq-3-phase converter 119.
  • the subtracter 111 of the speed control unit 110 converts the rotation angle ⁇ of the synchronous machine 1 measured by the rotation angle detector 106 (resolver, encoder, etc.) and calculated by the position calculator 107 into an angular velocity converted by the speed calculator 112.
  • ⁇ be a negative feedback signal, and output the angular velocity deviation subtracted from the angular velocity command ⁇ * .
  • the speed controller 113 receives the angular velocity deviation and the magnetic flux command ⁇ * as input, and outputs a torque current command i T * .
  • the dq-axis current calculator 114 receives the torque current command i T * and calculates a d-axis current command i d * and a q-axis current command i q * . At this time, the dq-axis current calculator 114 uses the load angle ⁇ calculated by the simulator 130. In this embodiment, the load angle ⁇ is used to generate the d-axis current command i d * and the q-axis current command i q * , but these may be any physical quantities or calculated values that can be generated.
  • the simulator calculates the current phase angle (the tangent of the d-axis current and the q-axis current), inputs it to the dq-axis current calculator 114, and calculates the d-axis current command i d * and the q-axis current command i
  • the simulator calculates the current phase angle (the tangent of the d-axis current and the q-axis current), inputs it to the dq-axis current calculator 114, and calculates the d-axis current command i d * and the q-axis current command i
  • a configuration that generates q * may also be used.
  • the three-phase-dq converter 117 converts the armature phase currents Iu, Iv, and Iw detected by the armature current detector 104 into a q- axis current iq and a d-axis current id .
  • the three-phase-dq converter 117 uses the rotation angle ⁇ , which is the output of the position calculator 107, during this conversion.
  • the q-axis current i q and the d-axis current i d obtained by the three-phase-dq converter 117 are input as feedback signals to the subtracter 115 and the subtracter 116 .
  • the subtracter 115 receives the d-axis current command i d * and the d-axis current i d as a feedock signal as input, and outputs a d-axis current deviation obtained by subtracting the d-axis current i d from the d-axis current command i d * . do.
  • the subtracter 116 receives the q-axis current command i q * and the q-axis current i q as a feedock signal as input, and outputs a q-axis current deviation obtained by subtracting the q-axis current i q from the q-axis current command i q * . do.
  • the dq-axis current controller 118 receives the d-axis current deviation from the subtracter 115 and the q-axis current deviation from the subtracter 116 as input, and calculates the d-axis voltage command V d * and the q-axis voltage command V q *. and output.
  • the dq-3 phase converter 119 converts the d -axis voltage command V d * and the q-axis voltage command V q * calculated by the dq-axis current controller 118 into the voltage commands Vu * , Vv * , Vw of each of the three phases. Convert to * .
  • the armature winding power converter 101 generates three-phase armature voltages Vu, Vv, and Vw that are proportional to the voltage commands Vu * , Vv * , and Vw * for each of these three phases, and supplies them to the synchronous machine 1. .
  • phase currents Iu, Iv, and Iw flow through the armature winding 22 of the synchronous machine 1. These phase currents Iu, Iv, and Iw are each detected by armature current detector 104.
  • the field current control unit 120 receives the magnetic flux command ⁇ * and the feedback signal of the field current i f and calculates the field current command i fd * , and the field current controller 121 calculates the field current command i fd *.
  • a field voltage command V f * is calculated from fd * and output to the field winding power converter 102 .
  • the field winding power converter 102 generates a field voltage V f proportional to the field voltage command V f * , and supplies it to the field winding 13 of the synchronous machine 1 .
  • a field current if flows through the field winding 13 of the synchronous machine 1. This field current if is detected by a field current detector 105.
  • the simulator 130 calculates and outputs a load angle command ⁇ * and a field current command i fd * from the magnetic flux command ⁇ * and the field current i fd which is a feedback signal.
  • the d-axis current i d , the q-axis current i q , and the torque command are also accepted as inputs.
  • the field current i fd is the field current converted to the armature side.
  • the simulator 130 is configured by, for example, a dq-axis equivalent circuit or a look-up table.
  • the load angle command ⁇ * may be replaced with any physical quantity or calculated value in accordance with the input of the dq-axis current calculator 114. That is, the simulator 130 only needs to be able to generate an auxiliary signal for generating the d-axis current command i d * and the q-axis current command i q * in the dq-axis current calculator 114.
  • the brake winding failure detection device 200 detects failures in the brake winding 16 (FIG. 3), such as breakage of the damper bar 14 (FIG. 2) provided on the rotor 10 of the synchronous machine 1.
  • the brake winding failure detection device 200 includes a switching section 210, a test current command value generation section 220, and an inspection measurement/determination section 230.
  • the switching unit 210 switches the state of the inverter device 100 from the normal operation mode to the failure inspection mode and from the failure inspection mode to the normal operation mode.
  • the inspection current command value generation unit 220 In the failure inspection mode, the inspection current command value generation unit 220 generates a d-axis current command i d * and a q-axis current command i q * in place of the output of the dq-axis current calculator 114 in the normal operation mode, and performs switching.
  • the subtracter 115 and the subtracter 116 are output via the subtracter 210 .
  • the test current command value generation section 220 includes an alternating current command section 221 and a zero current command section 222.
  • the alternating current command unit 221 generates an alternating current as a q-axis current command i q * .
  • the alternating current is a periodic signal having an arbitrary waveform such as a sine wave, a rectangular wave, a triangular wave, or a sawtooth wave.
  • the zero current command section 222 outputs a zero value as the d-axis current command i d * .
  • a zero value is used as the command value of the zero current command unit 222, but if the command value does not result in an alternating current, there will be no problem with the detection operation, so it simulates a direct current instead of an alternating current. It is also possible to substitute a current command with a value equivalent to DC, that is, a value equivalent to DC.
  • each input/output signal within the controller may be converted into an equivalent arbitrary signal.
  • a normalized value proportional to it such as normalization using the unit method
  • torque output
  • magnetic flux voltage
  • magnetic flux multiplied by the number of rotations use d-axis magnetic flux and q-axis magnetic flux instead of load angle (load angle is the tangent of d-axis magnetic flux and q-axis magnetic flux), etc. .
  • FIG. 2 is a cross-sectional view showing a configuration example of the synchronous machine 1 targeted by the inverter device 100 according to the first embodiment.
  • the synchronous machine 1 has a rotor 10 and a stator 20.
  • the rotor 10 includes a rotor shaft 11 rotatably supported on both sides in the axial direction by two bearings (not shown), a rotor core 12 provided on the radially outer side of the rotor shaft 11, and a plurality of convexes on the rotor core 12.
  • the stator 20 includes a cylindrical stator core 21 provided on the radially outer side of the rotor 10 via a gap space 30, and a plurality of stator teeth 21a formed on the inner peripheral surface of the stator core 21. It has a turned armature winding 22. Note that the stator 20 is normally housed in a space formed by a frame (not shown) that supports a bearing or a bearing bracket (not shown).
  • FIG. 2 shows an example in which the rotor has a six-pole structure, the number of poles, the number of slots, the number of windings, and the number of damper bars are arbitrary. Further, although FIG. 2 shows a salient pole type synchronous machine, a cylindrical synchronous machine similarly provided with a damper bar can also be used as the synchronous machine targeted by the inverter device 100.
  • FIG. 3 is a perspective view showing an example of the brake winding 16 of the synchronous machine 1 targeted by the inverter device 100 according to the first embodiment.
  • the damper winding 16 includes a plurality of damper bars 14 passing through the rotor core 12 in the axial direction at each pole, and is provided at both ends of the damper bars 14 in the axial direction to mechanically and electrically connect the damper bars 14. It has two short circuit rings 15 connecting the two.
  • Each of the six damper bars 14 provided on each of the six poles of the rotor 10 passes through the convex portion 12a of the rotor core 12, and then the entirety is mechanically coupled to the shorting ring 15 provided at both ends. connected and electrically shorted.
  • the number, length, and cross-sectional shape of the damper bars 14 are arbitrary, and there are no restrictions as long as they satisfy the electrical properties as the damper winding 16.
  • a structure may be adopted in which a conductor plate is provided at the end of the shaft.
  • the damper bar 14 and the short-circuit ring 15 are assembled by welding, fitting, etc. copper materials, but they may be integrally molded such as aluminum die-casting.
  • FIG. 4 is a configuration diagram for explaining the configuration and operation of the inspection measurement/judgment section 230 of the inverter device 100 according to the first embodiment.
  • the field winding 13 of the rotor 10 is drawn out of the stator 20 via a slip ring (not shown) or the like, and is connected to the field winding power converter 102.
  • a field current detector 105 for detecting a feedback signal of the field current shown in FIG. 1 is provided in the circuit connecting the field winding 13 and the field winding power converter 102.
  • An inspection measurement/judgment section 230 is provided on the output side of the field current detector 105.
  • the inspection measurement/determination section 230 includes a field voltage detector 231, and a computing unit 233, a determination device 234, and an alarm indicator 235 that constitute the failure determination section shown in FIG.
  • the field voltage detector 231 is provided for the purpose of stepping down the voltage to a level that can be input to the arithmetic unit 233, and uses, for example, a transformer (PT), a resistive voltage divider, or the like.
  • PT transformer
  • resistive voltage divider resistive voltage divider
  • the arithmetic unit 233 has a part that performs a Fourier transform function, and outputs an amplitude equivalent of a component synchronized with the fundamental frequency of the alternating current in the failure inspection mode. Note that instead of the Fourier transform, an effective value (rms value), an average rectified effective value (mean value), or other calculations that can obtain an amount equivalent to the amplitude of the AC voltage may be used. Furthermore, the computing unit 233 stores a certain number of values of the input signal (for example, the values of the past 10 points from the latest value) or a certain period of time (for example, the values of the past week from the latest value). , perform numerical processing (for example, calculation of integral and differential) and statistical processing (for example, calculation of arithmetic mean, geometric mean, variance, etc.) on the value.
  • the determiner 234 accepts the output of the arithmetic unit 233 as an input signal.
  • the determiner 234 compares the numerically/statistically processed value with a threshold set in advance for the synchronous machine 1, and if the numerically/statistically processed value exceeds the threshold, the damper bar 14 It is determined that a breakage has occurred. At this time, a signal indicating the abnormality is output to the failure indicator.
  • the threshold value is determined by calculation or testing, and the setting can be changed.
  • the alarm display 235 is composed of, for example, a liquid crystal display, and upon receiving the abnormality signal from the determiner 234, displays a display indicating a failure.
  • the arithmetic unit 233 and the determiner 234 may be configured with a digital circuit such as an FPGA (Field Programmable Gate Array) or a PC (Personal Computer). Alternatively, it may be configured with an analog circuit using an operational amplifier or the like.
  • a digital circuit such as an FPGA (Field Programmable Gate Array) or a PC (Personal Computer). Alternatively, it may be configured with an analog circuit using an operational amplifier or the like.
  • a filter or shield may be provided as necessary. Further, when the synchronous machine 1 is operated at high voltage, an insulation circuit or a protection circuit may be provided as necessary.
  • FIG. 5 is a flowchart showing the steps of a damper bar breakage failure detection method using the inverter device according to the first embodiment.
  • step S10 the synchronous machine 1 is brought to a stopped state. That is, the rotor 10 is not rotated, and the field winding 13 and the armature winding 22 are not energized.
  • the field winding power converter 102 on the power source side of the field winding 13 is brought to a stopped state (step S20).
  • the gate of the semiconductor element of the field winding power converter 102 may be turned off (gate blocked).
  • the disconnector may be opened.
  • step S30 the switching unit 210 switches to failure inspection mode
  • step S40 the following operations are performed in the failure inspection mode.
  • the alternating current command section 221 of the test current command value generation section 220 causes an alternating current to flow through the armature winding 22 in the q-axis direction (direction between magnetic poles) of the rotor 10 (step S41).
  • zero current flows through the armature winding 22 in the d-axis direction of the rotor 10 by the zero current command unit 222 . That is, no current flows in the d-axis direction of the rotor 10.
  • the field voltage detector 231 measures the induced voltage induced in the field winding 13 (step S42).
  • the calculator 233 derives the amplitude value of the synchronous component with the alternating current for the induced voltage induced in the field winding 13 (step S43).
  • the determiner 234 determines whether there is a breakage failure of the damper bar 14 (step S44). That is, the amplitude value derived by the determiner in step S43 is compared with a threshold value, and if the amplitude value exceeds the threshold value, it is determined that a breakage failure of the damper bar 14 has occurred, and an abnormality signal is output.
  • FIG. 6 is a conceptual explanatory diagram along the circumferential direction showing a case where the damper bar 14 of the synchronous machine 1 targeted by the inverter device 100 according to the first embodiment is healthy.
  • FIG. 6 is a diagram schematically showing the damper bar 14 and the short-circuit ring 15 of two adjacent magnetic poles centered on the q-axis developed along the circumferential direction.
  • the q-axis alternating magnetic flux generated by the armature current (magnetic flux density distribution that is maximum at Ca (on the q-axis) in Fig. 6) is distributed in the damper winding.
  • a damper current is induced in the damper winding 16 composed of the damper bar 14 and the short-circuit ring 15 so as to cancel it. Since the loop through which this current flows is symmetrical with respect to the q-axis as shown in Figure 6, the direction of the magnetomotive force created by the damper current is also the direction of the q-axis (Ca in Figure 6 (on the q-axis)), which is the maximum. magnetic force distribution).
  • FIG. 7 is a conceptual explanatory diagram along the circumferential direction showing a case where a breakage failure occurs in a damper bar of a synchronous machine targeted by the inverter device according to the first embodiment.
  • the damper current not only has the effect of canceling the q-axis magnetic flux, but also has the effect of generating magnetic flux on the d-axis.
  • a d-axis magnetic flux is generated. This is called interference between d and q axes. Since the d-axis alternating magnetic flux generated by the interference between the d and q axes interlinks with the field winding, a field voltage that should not occur if the brake winding 16 is healthy will occur in this case. Become.
  • FIG. 8 is a graph showing an example of the gap magnetic flux density distribution when the damper bar 14 of the synchronous machine 1 targeted by the inverter device according to the first embodiment is healthy and when a breakage failure has occurred. It is.
  • the horizontal axis is the mechanical angle (degrees) at the rotor 10, and the vertical axis is the gap magnetic flux density (T).
  • the curve shown by a broken line shows a case where the damper bar 14 is in a healthy state
  • the curve shown by a solid line shows a case where a part of the damper bar 14 is broken.
  • the magnetic flux density is point symmetrical at the center of the figure (horizontal axis 90 degrees, vertical axis 0T).
  • the gap magnetic flux density is not point symmetrical. This indicates that not only the magnetic flux distribution on one axis (q-axis) but also the magnetic flux component on the other axis (d-axis) is occurring.
  • FIG. 9 shows an example of the distribution of field voltage with respect to the current phase when the damper bar of the synchronous machine targeted by the inverter device according to the first embodiment is healthy and when a breakage failure has occurred. It is a graph. The horizontal axis shows the electrical angle (degrees) at the rotor 10, and the vertical axis shows the field voltage (V).
  • the curve shown by a broken line shows a case where the damper bar 14 is in a healthy state
  • the curve shown by a solid line shows a case where a part of the damper bar 14 is broken.
  • the distribution of field voltage when a part of the damper bar 14 is broken is clearly out of phase from the distribution of field voltage when the damper bar 14 is in a healthy state. I can see that In other words, the field current at a rotor electrical angle of 90 degrees (i.e., q-axis) is zero when the damper bar 14 is healthy, but when a part of the damper bar 14 is broken, it becomes significant.
  • the value ⁇ V is shown.
  • the determination unit 234 determines whether or not ⁇ V is higher than a predetermined threshold, thereby determining whether or not the damper bar 14 has a breakage failure.
  • FIG. 10 shows the field when the rotor electrical angle changes when the damper bar 14 of the synchronous machine 1 targeted by the inverter device 100 according to the first embodiment is healthy and when a breakage failure has occurred. It is a graph showing an example of distribution of magnetic voltage.
  • the results shown in FIGS. 8 and 9 shown above are changes in field voltage when the rotor 10 is fixed at a certain position (angle). In reality, it is not easy to make the position of the rotor 10 exactly the same, so it is assumed that the mode shifts to the failure inspection mode at an arbitrary position. In this case, since there are magnetic irregularities caused by the slots of the stator core 21, the detected value fluctuates due to the difference in relative position between the stator 20 and the rotor 10. FIG. 10 shows this.
  • FIG. 11 shows that the rotor position (converted to electrical angle) is random when the damper bar of the synchronous machine targeted by the inverter device according to the first embodiment is healthy and when a breakage failure has occurred.
  • 3 is a graph showing an example of a change in field voltage obtained through multiple tests in the case where the above occurs.
  • the points plotted in FIG. 11 are pseudo-calculated field voltage detection values assuming that the measurement results in FIG. 10 appear randomly and that multiple inspections have been performed. It is assumed that the failure occurred at the 800th time, and a clear difference in the trends can be seen.
  • the solid line in FIG. 11 is a moving average (arithmetic average) of 10 points calculated for the plotted points.
  • the damper winding failure detection device 200 of the inverter device 100 detects a breakage failure of the damper bar 14 without disassembling the synchronous machine 1 using the principle of interference between d and q axes. be able to.
  • FIG. 12 is a configuration diagram for explaining the configuration and operation of the inspection measurement/judgment section 230a of the inverter device 100a according to the second embodiment.
  • This embodiment is a modification of the first embodiment, and the inverter device 100a differs from the first embodiment in the inspection measurement/determination section 230a.
  • the inspection measurement/judgment unit 230a includes a field current detector 105, a calculator 233a, a determiner 234a, an alarm indicator 235, and a contactor 236.
  • the field current detector 105 is composed of devices that measure current as voltage, such as a shunt resistor, current transformer (CT), and Hall CT.
  • the field current detector 105 is a detector for detecting a feedback signal of the field current in the field current control section 120, but the field current detector 105 is a detector for detecting a feedback signal of the field current in the field current control section 120.
  • a separate container may also be provided.
  • a filter or shield may be installed as necessary to avoid false detection, or a filter or shield may be installed as necessary. Similar to the first embodiment, an insulation circuit or a protection circuit may be provided as necessary when the second embodiment is operated at a high voltage.
  • the contactor 236 is provided between the field winding 13 and the field winding power converter 102.
  • the contactor 236 is automatically turned on when the switching unit 210 switches to the failure inspection mode, and the field winding 13 is placed in a short-circuited state. Note that instead of providing the contactor 236, the short circuit may be achieved by turning on (conducting) the gate of the semiconductor element of the power converter 102.
  • an induced voltage is generated in the field winding 13 when the brake winding 16 is in failure, as in the first embodiment.
  • a field current is induced by the induced voltage.
  • This field current is measured by the field current detector 105, and its output is input to the calculator 233a. While the inspection measurement/judgment section 230 in the first embodiment detects failures based on voltage values, the inspection measurement/judgment section 230a of the present embodiment makes judgments based on current values.
  • SYMBOLS 1 Synchronous machine, 10... Rotor, 11... Rotor shaft, 12... Rotor core, 12a... Convex part, 13... Field winding, 14, 14a... Damper bar, 15... Short circuit ring, 16... Brake winding , 20... Stator, 21... Stator core, 21a... Stator teeth, 22... Armature winding, 30... Gap space, 100, 100a... Inverter device, 101... Power converter for armature winding, 102... Field winding power converter, 103... Breaker, 104... Armature current detector, 105... Field current detector, 106... Rotation angle detector, 107... Position calculator, 110...
  • Speed controller 110a ...Armature winding current control system, 111...Subtractor, 112...Speed calculator, 113...Speed controller, 114...DQ-axis current calculator, 115, 116...Subtractor, 117...3-phase-dQ converter, 118... dq axis current controller, 119... dq-3 phase converter, 120... field current controller, 121... field current controller, 130... simulator, 200... damper winding failure detection device, 210... switching unit , 220... Inspection current command value generation unit, 221... Alternating current command unit, 222... Zero current command unit, 230, 230a... Measurement/judgment unit during inspection, 231... Field voltage detector, 233, 233a... Arithmetic unit, 234, 234a... Judgment device, 235... Alarm indicator, 236... Contactor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

Selon un mode de réalisation de la présente invention, un appareil onduleur (100) comprend : un convertisseur de puissance (101) pour un enroulement d'induit; un convertisseur de puissance (102) pour un enroulement de champ; une unité de commande de vitesse (110) qui commande un courant triphasé sur les axes dq; une unité de commande de courant de champ (120) qui commande le courant de l'enroulement de champ; un simulateur (130); et un dispositif de détection de défaillance d'enroulement amortisseur (200). L'unité de détection de défaillance d'enroulement amortisseur (200) comprend : une unité de commutation (210) qui commute entre un mode de fonctionnement normal et un mode d'inspection de défaillance; une unité de génération de valeur de commande de courant d'inspection (220) qui délivre en sortie un CA en tant que commande de courant d'axe q et délivre une valeur équivalente en CC en tant que commande de courant d'axe d dans le mode d'inspection de défaillance; et une unité de mesure/détermination de temps d'inspection (230) qui mesure une réponse dans un enroulement de champ (13) et détermine, à partir d'un signal de réponse, la présence ou l'absence d'une anomalie dans l'enroulement amortisseur.
PCT/JP2022/032951 2022-09-01 2022-09-01 Appareil onduleur WO2024047843A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2022576014A JP7362950B1 (ja) 2022-09-01 2022-09-01 インバータ装置
PCT/JP2022/032951 WO2024047843A1 (fr) 2022-09-01 2022-09-01 Appareil onduleur
CN202280079109.1A CN118339758A (zh) 2022-09-01 2022-09-01 逆变器装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/032951 WO2024047843A1 (fr) 2022-09-01 2022-09-01 Appareil onduleur

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000184658A (ja) * 1998-12-11 2000-06-30 Osaka Gas Co Ltd 誘導電動機の診断装置
JP2017225224A (ja) * 2016-06-14 2017-12-21 東芝三菱電機産業システム株式会社 巻線界磁型同期機制御装置
WO2021074248A1 (fr) * 2019-10-14 2021-04-22 Norwegian University Of Science And Technology (Ntnu) Détection de panne dans des machines synchrones

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000184658A (ja) * 1998-12-11 2000-06-30 Osaka Gas Co Ltd 誘導電動機の診断装置
JP2017225224A (ja) * 2016-06-14 2017-12-21 東芝三菱電機産業システム株式会社 巻線界磁型同期機制御装置
WO2021074248A1 (fr) * 2019-10-14 2021-04-22 Norwegian University Of Science And Technology (Ntnu) Détection de panne dans des machines synchrones

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