KR860006868A - Induction motor operation control system and its control method - Google Patents

Abstract

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Description

Induction motor operation control system and its control method

Since this is an open matter, no full text was included.

1 is a diagram of a suitable embodiment of a power circuit for supplying power to an induction motor in accordance with the present invention. 8-10 are diagrams of variable or controllable VAR generators applicable to the system of the present invention. 13 and 14 are detailed diagrams illustrating possible devices of the system part of FIG. 12 shown in block form.

* Explanation of symbols for main parts of the drawings

10: Commutated inverter circuit (LCl), 11: AC / DC converter, 12: DC / AC converter, 14: DC link, 16: Inductor, 24: Induction motor, 35: Winding, 30: Capacitor circuit , 40: VAR generator.

Claims (87)

A system for controlling the operation of an AC induction motor having a winding supplied with an electric excitation from a polyphase AC power source, the system being connected between a power supply side and the induction motor, for supplying electric power and an excitation current to the motor in a negative polarity. A controllable load current inverter circuit having an output, a capacitor circuit connected to an output of the motor winding and the load current inverter circuit for supplying an exciting exciting current to the motor and the load current inverter circuit, and motor operation Means for generating a command signal, means for generating an excitation current correction signal indicative of a change in a predetermined motor excitation current for operation of a small level motor, and a first operation mode in the absence of a spillover signal, When there is a spillover signal, the Control means responsive to at least one of the motor operating command signal and the excitation current correction signal for controlling the output of the current inverter circuit, and generating the spillover signal when the excitation current correction signal exceeds a predetermined limit. And means for responding to said exciting current. The VAR generator of claim 1, further comprising a controllable VAR generator connected to the motor winding and an output of the load current inverter circuit for supplying an excitation current to the motor, wherein the predetermined limit is in proximity of the VAR generator. Induction motor operation control system characterized in that it exhibits the excitation current capacity. 2. The apparatus of claim 1, wherein the means for generating an excitation current correction signal comprises: means for generating an excitation current comment indicating a motor excitation current of a predetermined level and means for generating an actual excitation current indicator supplied to the motor; And a means for coupling a residual current command signal to the indication of the actual excitation current. 4. The induction motor actuation control system of claim 3 wherein the means for generating the indication of the actual excitation current supplied to the motor includes means responsive to motor terminal voltage and current. 4. The apparatus of claim 3, further comprising means for generating a signal indicative of a predetermined motor flux and substantially a motor flux and a difference therebetween, wherein said means for generating an excitation current command comprises: Induction motor operating control system, characterized in that it responds to a signal indicative of the difference between the actual magnetic flux levels. The output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the control means is adapted to the spillover signal to change the magnitude of the output current. An induction motor operation control system comprising means for responding. 2. The method of claim 1, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the control means is adapted to change the magnitude and phase angle of the output current. Induction motor operation control system comprising means for responding to a signal. A system for controlling the operation of a multi-saccharide induction motor, comprising: a controllable load current inverter circuit connected between a power supply side and the induction motor, the control circuit having an output for supplying electric power and an excitation current to the motor with a potato polarity; A capacitor circuit connected to the motor winding and an output terminal of the load current inverter circuit for supplying a phase excitation current to the motor and the load current inverter circuit, means for generating a motor operation command signal, and a spillover signal. Control means responsive to the motor operating command signal to control the output of the load current inverter circuit to the first operating level when there is no spillover signal and to the level when there is a spillover signal; Excitation current indicating change in motor excitation current When the means and said exciting current correction signal for generating a correction signal exceeds a predetermined limit, the induction motor operation control system comprising: means for in response to the exciting current to generate said spillover signal. 9. The apparatus of claim 8, further comprising a controllable VAR generator connected to the motor winding and an output of the load current inverter circuit for supplying excitation current to the motor, wherein the predetermined limit is in proximity of the VAR generator. Induction motor operating control system, characterized in that it exhibits an excitation current capacity. 9. The apparatus of claim 8, wherein the means for generating the excitation current correction signal comprises: means for generating an excitation current command representing a motor excitation current of a predetermined level, means for generating an actual excitation current indicator supplied to the motor; And means for coupling the excitation current command signal to the indication of the actual excitation current. An induction motor operating control system according to claim 10, wherein said means for generating said indication of the actual excitation current supplied to the motor comprises means responsive to motor terminal voltage and current. 12. The apparatus of claim 11, further comprising means for generating a signal indicative of a predetermined motor flux and a substantial motor flux and a difference therebetween wherein said means for generating an excitation current command comprises: a predetermined motor flux level and an actual flux. An induction motor operating control system, responsive to a signal indicative of a difference between levels. 9. The method of claim 8, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the control means responds to the spillover signal to change the magnitude of the output current. An induction motor operation control system comprising a means for. 9. The method of claim 8, wherein the output of the load current inverter circuit is an output current having a magnitude and phase angle associated with a reference point, wherein the control means is adapted to change the magnitude and phase angle of the output current. Induction motor operation control system comprising means for responding to a signal. A system for controlling the operation of an AC induction motor having a winding to which an electric excitation is supplied from a polyphase AC power source, the system being connected between a power supply side and the induction motor, the output supplying power and an excitation current to the motor with magnetization polarity. Of a controllable load current inverter circuit, a motor winding, and a load current inverter circuit comprising an AC / DC converter on the controllable source side and a DC / AC converter on the controllable load side interconnected by a DC link. A capacitor circuit connected to an output terminal for supplying a phase excitation current to the motor and the load current inverter circuit, and a motor winding and the load current inverter circuit to supply an excitation current to the motor and the load current circuit. Connected between the upper and lower limits A controllable VAR generator operable to provide an excitation current, means for generating an electric motor operation command signal, and a first level of operation in the absence of a spillover signal to a different level when the spillover signal is present A first control passage comprising means for responding to the motor operating command signal to control the operation of an AC / DC converter, and a first level of operation in the absence of a spillover signal to a different level if the spillover signal is present; To generate a second word passage responsive to the motor operation command signal to control the operation of the DC / AC converter and an excitation current correction signal indicative of a change in the predetermined motor excitation current for operation of the motor of a predetermined level. Means and the excitation current to control the excitation current supplied to the motor by the VAR generator. And a third control passage responsive to the current correction signal, and means for controlling the excitation current supplied to the motor from the load current inverter circuit in response to the excitation current correction signal to generate the spillover signal. Induction motor operation control system. 16. The apparatus of claim 15, wherein the means for generating the excitation current correction signal comprises: means for generating an excitation current command indicative of a motor excitation current of a predetermined level, means for generating an actual excitation current indication supplied to the motor; And means for coupling the excitation current command signal to the indication of the actual excitation current. 17. The induction motor operating control system of claim 16, wherein the means for generating the indication of the actual exciting current supplied to the motor comprises means responsive to motor terminal voltage and current. 17. The apparatus of claim 16, further comprising means for generating a signal indicative of a predetermined motor flux and a substantial motor flux and a difference therebetween, wherein said means for generating an excitation current command comprises: Induction motor operating control system, characterized in that it responds to a signal indicative of the difference between the actual flux levels. 16. The control system of claim 15, wherein said third control passage comprises means for providing a limited output signal indicative of an excitation current approximation threshold supplied to said motor by said VAR generator. 20. The apparatus of claim 19, wherein said means for generating said spillover signal comprises means for generating said spillover signal in response to an excitation current correction signal exceeding a value corresponding to a threshold of said limited output signal. Induction motor operation control system. 16. The method of claim 15, wherein the output of the load current inverter circuit is an output current having a magnitude and phase angle associated with a reference point, wherein the first control passage is the spillover signal for defending the magnitude of the output current. And means for responding to the induction motor actuation control system. 16. The method of claim 15, wherein the output of the load current inverter circuit is an output current having a magnitude and phase angle associated with a reference point, wherein the first control passage is the spillover signal to change the magnitude of the output current. And means for responsive to said spillover signal for varying the phase angle of said output current. A system for controlling the operation of an induction motor having a winding to which an electric excitation is supplied from a polyphase alternating current power source, the system being connected between a power supply side and the induction motor, and outputting an electric power supply and an excitation current to the motor with magnetization polarity. And a control load current inverter circuit including an AC / DC converter on the controllable source side and a DC / AC converter on the controllable load side interconnected by a DC link, and an output end of the motor winding and the load current inverter circuit. A capacitor circuit for supplying a phase excitation current to the motor and the load current inverter circuit, and a motor winding and the load current inverter circuit for supplying an excitation current to the motor and the load current circuit. Between the upper and lower limits A controllable VAR generator operable to provide magnetic current, means for generating a motor operating signal, and a first level of operation in the absence of a spillover signal and a direct current to a different level when the spillover signal is present A first control passage comprising means for responding to the motor operating command signal to control the action of the alternating current on the converter and responsive to the motor actuation command signal to control the action of the direct current on the alternating current converter Controlling the excitation current supplied to the motor by the VAR generator, and means for generating a second control passage, an excitation current correction signal indicative of a change in the predetermined motor excitation current for operation of the motor of a predetermined level. A third control passage responsive to the excitation current correction signal, and Induction motor operation control system for a load current from the inverter circuit, characterized in that it comprises means for controlling the excitation current supplied to the electric motor. 24. The apparatus of claim 23, wherein the means for generating an excitation current correction signal comprises: means for generating an excitation current command indicative of a motor excitation current of a predetermined level, means for generating an actual excitation current marker supplied to the motor; And means for coupling the excitation current command signal to the indication of the actual excitation current. 25. The induction motor operating control system of claim 24, wherein the means for generating the indication of the actual excitation current supplied to the motor includes means responsive to motor terminal voltage and current. 25. The apparatus of claim 24, further comprising means for generating a signal indicative of a predetermined motor flux and a substantial motor flux and a difference therebetween, wherein said means for generating an excitation current command is equal to a predetermined motor flux level. Induction motor operating control system, characterized in that it responds to a signal indicative of the difference between the actual flux levels. 24. The induction of claim 23, wherein the third control passage comprises means for providing a defined output signal having an upper limit indicating a close threshold of a forward excitation current supplied to the motor by the VAR generator. Electric motor operation control system. 28. The apparatus of claim 27, wherein said means for generating said spillover signal comprises means for generating said spillover signal in response to an excitation current correction signal exceeding a value corresponding to a lower limit of said limited output signal. Induction motor operation control system. 24. The method of claim 23, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the first control passage is the spillover to change the magnitude of the output current. Induction motor operation control system comprising means for responding to a signal. A system for controlling the operation of an AC induction motor having a winding to which an electric excitation is supplied from a polyphase AC power source, the system being connected between a power supply side and the induction motor, the output supplying power and an excitation current to the motor with magnetization polarity. A controllable load current type inverter circuit comprising an AC / DC converter on the controllable source side and a DC / AC converter on the controllable load side, the motor windings and the load current inverter circuit being interconnected by a DC link; A capacitor circuit connected to an output terminal for supplying a phase excitation current to the motor and the load current inverter circuit, and a motor winding and the load current inverter circuit to supply an excitation current to the motor and the load current circuit. Connected between the upper and lower A controllable VAR generator operable to provide an excitation current, means for generating an motor actuation signal, and a first level of operation in the absence of a spillover signal to another level when the spillover signal is present A first control passage comprising means for responding to said motor operating command signal for controlling the action of said alternating current on a direct current converter; and said motor operating command signal for controlling the action of said direct current on an alternating current converter. Means for generating an exciting second control passage and an excitation current correction signal indicative of a change in a predetermined motor excitation current for motor operation of a predetermined level, and controlling the excitation current supplied to the motor by the VAR generator; A third control passage responsive to said excitation current correction signal, and said spillover In response to the exciting current to generate the arc, and the induction motor operation control system, characterized in that means for controlling the exciting current supplied to said motor from said load current-type inverter circuit. 31. The apparatus of claim 30, wherein the means for generating the excitation current correction signal comprises: means for generating an excitation current command indicative of a motor excitation current of a predetermined level, means for generating an actual excitation current marker supplied to the motor; And means for coupling the excitation current command signal to the indication of the actual excitation current. 32. The control system of claim 31 wherein said means for generating said indication of the actual excitation current supplied to the motor comprises means responsive to motor terminal voltage and current. 32. The apparatus of claim 31, further comprising means for generating a signal indicative of a predetermined motor flux and a substantial motor flux and a difference therebetween, wherein said means for generating an exciting current command is equal to a predetermined motor flux level. Induction motor operating control system, characterized in that it responds to a signal indicative of the difference between the actual flux levels. 31. The apparatus of claim 30, wherein the third control passage is supplied to the motor by the VAR generator, and means for providing a limited output signal having lower and upper threshold values, respectively, indicating relative near maximum forward and relative ground excitation currents. Induction motor operation control system comprising a. 35. The apparatus of claim 34, wherein the means for generating the spillover signal comprises means for generating the first spillover signal in response to an excitation current correction signal that exceeds a value corresponding to a lower limit of the defined output signal. Induction motor operation control system comprising a. 35. The induction motor operational control of claim 34, wherein said means for generating said spillover signal comprises a response to an excitation current correction signal that exceeds a corresponding value of an upper limit of said limited output signal. system. 35. The apparatus of claim 34, wherein the means for generating the spillover signal comprises: the first and second spillover signals responsive to an excitation current correction signal exceeding values corresponding to lower and upper thresholds of the finite output signal, respectively. Induction motor operation control system comprising a means for generating a. 31. The method of claim 30, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the first control passage is the first spillover for varying the magnitude of the output current. Means for responding to a signal and said second control passage includes means for responding to said first spillover signal for varying a phase angle of said output current. 31. The method of claim 30, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase angle associated with a reference point, wherein the first control passages are the first and second changing the magnitude of the output current. And a means for responding to a spillover signal, wherein the second control passage comprises means for responding to the first spillover signal for varying the phase angle of the output current. A system for controlling the operation of an AC induction motor having a winding to which an electric excitation is supplied from a polyphase AC power source, the system being connected between a power supply side and the induction motor, the output supplying power and an excitation current to the motor with magnetization polarity. A controllable load current type inverter circuit comprising an AC / DC converter on the controllable source side and a DC / AC converter on the controllable load side, the motor windings and the load current inverter circuit of which are interconnected by a DC link; A capacitor circuit connected to an output terminal for supplying a phase excitation current to the motor and the load current inverter circuit, means for generating an operation command signal, and indicating a change in the motor excitation current required for operation of a motor of a predetermined level. Number to generate the excitation current correction signal And a first responding to the motor operating command signal and the exciting current correction signal to control the operation of the AC / DC converter to a first level of operation when there is no spillover signal and to a different level when the spillover signal is present. A control passage and a second control passage responsive to the motor operating command signal to control the operation of the DC / AC converter to a first level of operation when there is no spillover signal and to another level when the spillover signal is present; Means for responding to said exciting current correction signal for generating said spillover signal when the exciting current supplied to said motor from said load current inverter circuit and capacitor circuit insufficiently changes the motor exciting current. Induction motor operation control system. 41. The apparatus of claim 40, wherein the means for generating an excitation current correction signal comprises: means for generating an excitation current command indicative of a motor excitation current of a predetermined level, means for generating an actual excitation current indication supplied to the motor; And means for coupling the excitation current command signal to the indication of the actual excitation current. 42. The induction motor actuation control system of claim 41 wherein the means for generating the indication of the actual excitation current supplied to the motor comprises means responsive to motor terminal voltage and current. 42. The apparatus of claim 41, further comprising means for generating a signal indicative of a predetermined motor flux and a substantial motor flux and a difference therebetween, wherein said means for generating an excitation current command is equal to a predetermined motor flux level. Induction motor operating control system, characterized in that it responds to a signal indicative of the difference between the actual magnetic flux levels. 41. The method of claim 40, wherein the output of the load current inverter circuit is an output current having a magnitude and phase associated with a reference point, wherein the first control passage is adapted to the spillover signal for varying the magnitude of the output current. An induction motor operation control system comprising means for responding. 41. The apparatus of claim 40, wherein the output of the load current inverter circuit is an output current having a magnitude and a phase associated with a reference point, wherein the first control passage is adapted to the spillover signal for varying the magnitude of the output current. And means for responding, wherein the second control passage comprises the second control passage including means for responding to the spillover signal for varying the phase angle of the output current. Control system. A system for controlling the operation of an alternating current induction motor having a winding supplied with an electric excitation from a polyphase alternating current power source, the control function being an output function of a controllable load current inverter circuit connected between a power supply and the induction motor. Supplying electric power and an excitation current in polarity, supplying a phase excitation current to the motor and the load current inverter circuit by using a capacitor circuit connected to the motor winding and an output terminal of the load current inverter circuit; Generating an motor operation command signal, generating an excitation current correction signal indicative of a change in motor excitation current required for operation of the motor at a correction level, and the spillover to a first level of operation when there is no spillover signal; When the signal is present, start the motor with a different mode. Controlling an output of the lower current inverter circuit in response to at least one of the command command and the excitation current correction signal, and generating the spillover signal when the excitation current correction signal exceeds a predetermined threshold. Induction motor operation control method characterized in that it comprises. 46. The method of operating an induction motor according to claim 45, further comprising the step of supplying an excitation current from the controllable VAR generator whose excitation current capacity is indicated by the above threshold to the load current inverter circuit and the motor. . 48. The method of claim 47, wherein generating the excitation current correcting signal comprises: generating an excitation current command indicative of a motor excitation current of a predetermined level, generating an indication of the actual excitation current supplied to the motor; Coupling a current command signal to the indicia of the actual excitation current. 49. The method of claim 48, wherein generating the marker of the actual exciting current supplied to the motor is performed in response to the motor terminal voltage and current. 49. The method of claim 48, wherein generating an exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a magnetic flux of an actual level, and extracting a signal proportional to the difference between the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 47. The method of claim 46, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference point and to vary the magnitude and phase angle of the output current in response to the spillover signal. Induction motor operation control method. A system for controlling the operation of an alternating current induction motor having a winding to which an electrical excitation is supplied from a polyphase alternating current power supply, the system comprising: a demagnetizer as an output function of a controllable load current inverter circuit connected between a power supply and the induction motor Supplying power and an excitation current in polarity, supplying a phase excitation current to the motor and the load current inverter circuit using a capacitor circuit connected to the motor winding and an output terminal of the load current inverter circuit; Generating the motor operation comment signal, controlling the output of the load current inverter circuit to a first level of operation when there is no spillover signal, and to another mode when the spillover signal is present; Indicates the change in motor excitation current required to operate the motor Generating a self current correction signal and generating the spillover signal for controlling an excitation current supplied from the load current inverter circuit to the motor when the excitation current correction signal exceeds a predetermined threshold value. Induction motor operation control method characterized in that. 53. The method of operating the induction motor of claim 52, further comprising supplying an excitation current to the load current inverter circuit and the motor using a controllable VAR generator whose excitation current capacity is represented by the threshold. . 53. The method of claim 52, wherein generating the excitation current correction signal comprises: generating an excitation current comment indicating a motor excitation current of a predetermined level, generating an indication of an actual excitation current supplied to the motor; Coupling an excitation current command signal to the indication of the actual excitation current. 55. The method of claim 54 wherein the step of generating an indication of the actual exciting current supplied to the motor is performed in response to the motor terminal voltage and current. 55. The method of claim 54, wherein generating the exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a motor flux of a real level, and extracting a signal proportional to the difference between the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 53. The method of claim 52, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference point and to vary the magnitude and phase angle of the output current in response to the spillover signal. Induction motor operation control method. A system for controlling the operation of an AC induction motor having a winding supplied with an electric excitation from a polyphase AC power source, the control source being connected between a power supply side and the induction motor and interconnected by a DC link. Supplying electric power and an excitation current to the motor as a function of the output of a controllable load current inverter circuit comprising a direct current converter and a direct current / AC converter on the controllable load side, the motor windings and the load current Supplying a phase excitation current to the motor and the load current inverter circuit using a capacitor circuit connected to an output terminal of the type inverter circuit, and controllable connected to an output end of the motor winding and the load current inverter circuit. The motor and the load as an output function from a generator Additionally supplying an excitation current to the current-type inverter circuit, generating an motor operation comment signal, the first level of operation when there is no spillover signal, and the other level when the spillover signal is present. Controlling the operation of the DC converter, controlling the operation of the DC / AC converter to a first level of operation when there is no spillover signal, and to a different level when the spillover signal is present; Generating an excitation current correction signal indicative of a change in motor excitation current required for operation; controlling an output of the VAR generator to change an excitation current supplied to the motor in response to the excitation current correction signal; And an excitation supplied to the motor from the load current inverter circuit in response to the excitation current correction signal. Induction motor operation control method comprising the step of generating the spillover signal for controlling the flow. 59. The method of claim 58, wherein generating the excitation current correction signal comprises: generating an excitation current command indicative of a motor excitation current of a predetermined level, generating an indication of the actual excitation current supplied to the motor; Coupling an excitation current comment signal to the indicia of the actual excitation current. 60. The method of controlling an induction motor in accordance with claim 59, wherein generating the marker of the actual exciting current supplied to the motor is performed in response to the motor terminal voltage and current. 60. The method of claim 59, wherein generating the exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a magnetic flux of an actual level, and extracting a signal proportional to the difference between the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 60. The method of claim 58, wherein the spillover signal is generated in response to an exciting current correction signal having a value that exceeds a value corresponding to a defined lower limit. 59. The method of claim 58, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference point, wherein the first control passage is magnitude of the output current in response to the spillover signal. Induction motor operation control method, characterized in that for changing. 59. The method of claim 58, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference point, wherein the first control passage is magnitude of the output current in response to the spillover signal. And the second control passage changes the phase angle of the output current in response to the spillover signal. A system for providing operation of an AC induction motor having a winding supplied with an electric excitation from a polyphase AC power source, the system comprising: an AC on a controllable source side connected between a power supply side and the induction motor and interconnected by a DC link. Supplying electric power and an excitation current to the motor as a function of the output of a controllable load current type inverter circuit comprising a direct current converter and a direct current / AC converter on the controllable load side, the motor winding and the load current Supplying a phase excitation current to the motor and the load current inverter circuit using a capacitor circuit connected to an output terminal of the type inverter circuit, and controllable connected to an output end of the motor winding and the load current inverter circuit. The motor and the load as an output function from a generator Further supplying an excitation current to the current inverter circuit, generating an motor operation comment signal, the first level of operation when there is no spillover signal, and the other level when the spillover signal is present. Controlling the operation of the direct current converter; generating an excitation current correction signal indicative of a change in the motor excitation current required for operation of the motor at a predetermined level; and excitation supplied to the motor in response to the excitation current correction signal. Controlling the output of the VAR generator to change the current; and generating the spillover signal in response to the excitation current correction signal and controlling the excitation current supplied from the load current inverter circuit to the motor. Induction motor operation control method characterized in that it comprises. 67. The method of claim 65, wherein generating the excitation current correction signal comprises: generating an excitation current command indicating a motor excitation current of a predetermined level, generating an indication of the actual excitation current supplied to the motor; Coupling an excitation current command signal to the indication of the actual excitation current. 67. The method of claim 66 wherein the step of generating an indication of the actual excitation current supplied to the motor is performed in response to the motor terminal voltage and current. 67. The method of claim 66, wherein generating the exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a magnetic flux of an actual level, and extracting a signal proportional to the difference between the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 66. The method of claim 65 wherein the spillover signal is generated in response to an excitation current correction signal having a value that exceeds a value corresponding to a defined upper limit value. 66. The method of claim 65, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference pointer, wherein the first control passage is magnitude of the output current in response to the spillover signal. Induction motor operation control method, characterized in that for changing. A system for providing operation of an AC induction motor having a winding supplied with an electric excitation from a polyphase AC power source, the system comprising: an AC on a controllable source side connected between a power supply side and the induction motor and interconnected by a DC link. Supplying electric power and an excitation current to the motor as a function of the output of a controllable load current type inverter circuit comprising a direct current converter and a direct current / AC converter on the controllable load side, the motor winding and the load current Supplying a phase excitation current to the motor and the load current inverter circuit using a capacitor circuit connected to an output terminal of the type inverter circuit, and controllable connected to an output end of the motor winding and the load current inverter circuit. The motor and the motor as an output function from a VAR generator. Supplying an excitation current to the low current inverter circuit, generating a motor operation comment signal, and a first level of operation when there is no spillover signal and a different level when there is a first spillover signal. Controlling the operation of the AC / DC converter at a different level even when there is a 2 spillover signal; and at a different level when the first spillover signal is at a first level of operation when there is no spillover signal. Controlling the operation of the AC converter, generating an excitation current correction signal indicative of a change in the motor excitation current required to operate the motor of a predetermined level, and an excitation current supplied to the motor in response to the excitation current correction signal. Controlling the output of the VAR generator between defined thresholds to change the voltage and the excitation current correction signal; Response, and how an induction motor works control comprising the step of generating the first and second spill-over signal for controlling the exciting current supplied to said motor from said load current-type inverter circuit. 72. The method of claim 71, wherein generating the excitation current correction signal comprises: generating an excitation current command indicative of a motor excitation current of a predetermined level, generating an indication of the actual excitation current supplied to the motor; Coupling an excitation current command signal to the indication of the actual excitation current. 73. The method of operating an induction motor in accordance with claim 72, wherein generating the marker of the actual excitation current supplied to the motor is performed in response to the motor terminal voltage and current. 73. The method of claim 72, wherein generating an exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a magnetic flux of an actual level, and extracting a signal proportional to the difference between the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 72. The method of claim 71, wherein the VAR generator is controlled to supply relative fastening currents and relative ground currents. 72. The method of claim 71, further comprising generating limited output signal correction signals of lower and upper threshold values, wherein the VAR generator is supplied to the motor by the VAR generator, respectively, relative relative maximum phase current and Induction motor operation control method characterized in that it is controlled by said limited output signal between lower and upper specified threshold values representing relative ground excitation current. The method of claim 76, wherein the first spillover signal is generated in response to an exciting current correction signal having a value exceeding a value corresponding to a lower limit of the limited output signal. 78. The method of claim 77 wherein the second spillover signal is generated in response to an excitation current correction signal having a value exceeding a value corresponding to an upper limit of the limited output signal. 77. The induction motor operation of claim 76, wherein the first and second spillover signals are generated in response to an excitation current correction signal exceeding values corresponding to lower and upper thresholds of the limited output signal, respectively. Control method. 72. The circuit of claim 71, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference pointer, wherein the first control passage is in response to the first spillover signal. And varying a magnitude of an output current, wherein the second control passage changes a phase angle of the output current in response to the first spillover signal. 72. The circuit of claim 71, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference pointer, wherein the first control passage is responsive to the first and second spillover signals. And changing the magnitude of the output current, wherein the second control passage changes the phase angle of the output current in response to the first spillover signal. A system for controlling the operation of an AC induction motor having a winding supplied with an electric excitation from a polyphase AC power source, the control source being connected between a power supply side and the induction motor and interconnected by a DC link. Supplying electric power and an excitation current to the motor as a function of the output of a controllable load current type inverter circuit comprising a direct current converter and a direct current / AC converter on the controllable load side, the motor winding and the load current Supplying a phase excitation current to the motor and the load current inverter circuit using a capacitor circuit connected to an output terminal of the type inverter circuit, generating a motor operation command signal, and operating in the absence of a spillover signal. To the first level of, to another level when the spillover signal is present Controlling the operation of the AC / DC converter in response to the motor operation command signal and the excitation current correction signal, to a first level of operation when there is no spillover signal, and to a different level when the spillover signal is present; Controlling the operation of the DC / AC converter in response to the actuator operation command signal and the excitation current correction signal, supplying an excitation current to the motor from the load current inverter circuit, wherein the capacitor circuit is insufficient in motor excitation current And generating the spillover signal in response to the excitation current when the conversion is performed. 85. The method of claim 82, wherein the generating of the excitation current correction signal comprises: generating an excitation current command representing a motor excitation current of a predetermined level, generating an indication of an actual excitation current supplied to the motor; Coupling an excitation current command signal to the indication of the actual excitation current. 84. The method of controlling the induction motor of claim 83, wherein generating the marker of the actual excitation current supplied to the motor is performed in response to the motor terminal voltage and current. 84. The method of claim 83, wherein generating an exciting current command comprises: generating a magnetic flux signal indicative of a motor flux of a predetermined level and a magnetic flux of an actual level, and extracting a signal proportional to the difference of the magnetic flux signal; And generating the exciting current command in response to the signal indicative of a difference between the magnetic flux signals. 83. The apparatus of claim 82, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference pointer, wherein the AC / DC converter changes the magnitude of the output current. In response to the induction motor operation control method. 83. The apparatus of claim 82, wherein the load current inverter circuit is controlled to provide an output current having a magnitude and phase angle relative to a reference pointer, wherein the AC / DC converter changes the magnitude of the output current. In response to a spillover signal, wherein the DC / AC converter is responsive to the spillover signal that changes the phase angle of the output current. ※ Note: The disclosure is based on the initial application.